1use crate::{
   2    blame_entry_tooltip::{blame_entry_relative_timestamp, BlameEntryTooltip},
   3    code_context_menus::CodeActionsMenu,
   4    display_map::{
   5        Block, BlockContext, BlockStyle, DisplaySnapshot, HighlightedChunk, ToDisplayPoint,
   6    },
   7    editor_settings::{
   8        CurrentLineHighlight, DoubleClickInMultibuffer, MultiCursorModifier, ScrollBeyondLastLine,
   9        ShowScrollbar,
  10    },
  11    git::blame::{CommitDetails, GitBlame},
  12    hover_popover::{
  13        self, hover_at, HOVER_POPOVER_GAP, MIN_POPOVER_CHARACTER_WIDTH, MIN_POPOVER_LINE_HEIGHT,
  14    },
  15    hunk_diff::{diff_hunk_to_display, DisplayDiffHunk},
  16    hunk_status,
  17    items::BufferSearchHighlights,
  18    mouse_context_menu::{self, MenuPosition, MouseContextMenu},
  19    scroll::scroll_amount::ScrollAmount,
  20    BlockId, ChunkReplacement, CursorShape, CustomBlockId, DisplayPoint, DisplayRow,
  21    DocumentHighlightRead, DocumentHighlightWrite, Editor, EditorMode, EditorSettings,
  22    EditorSnapshot, EditorStyle, ExpandExcerpts, FocusedBlock, GutterDimensions, HalfPageDown,
  23    HalfPageUp, HandleInput, HoveredCursor, HoveredHunk, InlineCompletion, JumpData, LineDown,
  24    LineUp, OpenExcerpts, PageDown, PageUp, Point, RowExt, RowRangeExt, SelectPhase, Selection,
  25    SoftWrap, ToPoint, CURSORS_VISIBLE_FOR, FILE_HEADER_HEIGHT,
  26    GIT_BLAME_MAX_AUTHOR_CHARS_DISPLAYED, MAX_LINE_LEN, MULTI_BUFFER_EXCERPT_HEADER_HEIGHT,
  27};
  28use client::ParticipantIndex;
  29use collections::{BTreeMap, HashMap, HashSet};
  30use file_icons::FileIcons;
  31use git::{blame::BlameEntry, diff::DiffHunkStatus, Oid};
  32use gpui::{
  33    anchored, deferred, div, fill, outline, point, px, quad, relative, size, svg,
  34    transparent_black, Action, AnchorCorner, AnyElement, AvailableSpace, Bounds, ClickEvent,
  35    ClipboardItem, ContentMask, Corners, CursorStyle, DispatchPhase, Edges, Element,
  36    ElementInputHandler, Entity, FontId, GlobalElementId, HighlightStyle, Hitbox, Hsla,
  37    InteractiveElement, IntoElement, Length, ModifiersChangedEvent, MouseButton, MouseDownEvent,
  38    MouseMoveEvent, MouseUpEvent, PaintQuad, ParentElement, Pixels, ScrollDelta, ScrollWheelEvent,
  39    ShapedLine, SharedString, Size, StatefulInteractiveElement, Style, Styled, Subscription,
  40    TextRun, TextStyleRefinement, View, ViewContext, WeakView, WindowContext,
  41};
  42use itertools::Itertools;
  43use language::{
  44    language_settings::{
  45        IndentGuideBackgroundColoring, IndentGuideColoring, IndentGuideSettings,
  46        ShowWhitespaceSetting,
  47    },
  48    ChunkRendererContext,
  49};
  50use lsp::DiagnosticSeverity;
  51use multi_buffer::{
  52    Anchor, AnchorRangeExt, ExcerptId, ExcerptInfo, ExpandExcerptDirection, MultiBufferPoint,
  53    MultiBufferRow, MultiBufferSnapshot, ToOffset,
  54};
  55use project::{
  56    project_settings::{GitGutterSetting, ProjectSettings},
  57    ProjectPath,
  58};
  59use settings::Settings;
  60use smallvec::{smallvec, SmallVec};
  61use std::{
  62    any::TypeId,
  63    borrow::Cow,
  64    cmp::{self, Ordering},
  65    fmt::{self, Write},
  66    iter, mem,
  67    ops::{Deref, Range},
  68    rc::Rc,
  69    sync::Arc,
  70};
  71use sum_tree::Bias;
  72use theme::{ActiveTheme, Appearance, PlayerColor};
  73use ui::prelude::*;
  74use ui::{h_flex, ButtonLike, ButtonStyle, ContextMenu, Tooltip};
  75use unicode_segmentation::UnicodeSegmentation;
  76use util::RangeExt;
  77use util::ResultExt;
  78use workspace::{item::Item, Workspace};
  79
  80struct SelectionLayout {
  81    head: DisplayPoint,
  82    cursor_shape: CursorShape,
  83    is_newest: bool,
  84    is_local: bool,
  85    range: Range<DisplayPoint>,
  86    active_rows: Range<DisplayRow>,
  87    user_name: Option<SharedString>,
  88}
  89
  90impl SelectionLayout {
  91    fn new<T: ToPoint + ToDisplayPoint + Clone>(
  92        selection: Selection<T>,
  93        line_mode: bool,
  94        cursor_shape: CursorShape,
  95        map: &DisplaySnapshot,
  96        is_newest: bool,
  97        is_local: bool,
  98        user_name: Option<SharedString>,
  99    ) -> Self {
 100        let point_selection = selection.map(|p| p.to_point(&map.buffer_snapshot));
 101        let display_selection = point_selection.map(|p| p.to_display_point(map));
 102        let mut range = display_selection.range();
 103        let mut head = display_selection.head();
 104        let mut active_rows = map.prev_line_boundary(point_selection.start).1.row()
 105            ..map.next_line_boundary(point_selection.end).1.row();
 106
 107        // vim visual line mode
 108        if line_mode {
 109            let point_range = map.expand_to_line(point_selection.range());
 110            range = point_range.start.to_display_point(map)..point_range.end.to_display_point(map);
 111        }
 112
 113        // any vim visual mode (including line mode)
 114        if (cursor_shape == CursorShape::Block || cursor_shape == CursorShape::Hollow)
 115            && !range.is_empty()
 116            && !selection.reversed
 117        {
 118            if head.column() > 0 {
 119                head = map.clip_point(DisplayPoint::new(head.row(), head.column() - 1), Bias::Left)
 120            } else if head.row().0 > 0 && head != map.max_point() {
 121                head = map.clip_point(
 122                    DisplayPoint::new(
 123                        head.row().previous_row(),
 124                        map.line_len(head.row().previous_row()),
 125                    ),
 126                    Bias::Left,
 127                );
 128                // updating range.end is a no-op unless you're cursor is
 129                // on the newline containing a multi-buffer divider
 130                // in which case the clip_point may have moved the head up
 131                // an additional row.
 132                range.end = DisplayPoint::new(head.row().next_row(), 0);
 133                active_rows.end = head.row();
 134            }
 135        }
 136
 137        Self {
 138            head,
 139            cursor_shape,
 140            is_newest,
 141            is_local,
 142            range,
 143            active_rows,
 144            user_name,
 145        }
 146    }
 147}
 148
 149pub struct EditorElement {
 150    editor: View<Editor>,
 151    style: EditorStyle,
 152}
 153
 154type DisplayRowDelta = u32;
 155
 156impl EditorElement {
 157    pub(crate) const SCROLLBAR_WIDTH: Pixels = px(13.);
 158
 159    pub fn new(editor: &View<Editor>, style: EditorStyle) -> Self {
 160        Self {
 161            editor: editor.clone(),
 162            style,
 163        }
 164    }
 165
 166    fn register_actions(&self, cx: &mut WindowContext) {
 167        let view = &self.editor;
 168        view.update(cx, |editor, cx| {
 169            for action in editor.editor_actions.borrow().values() {
 170                (action)(cx)
 171            }
 172        });
 173
 174        crate::rust_analyzer_ext::apply_related_actions(view, cx);
 175        crate::clangd_ext::apply_related_actions(view, cx);
 176        register_action(view, cx, Editor::open_context_menu);
 177        register_action(view, cx, Editor::move_left);
 178        register_action(view, cx, Editor::move_right);
 179        register_action(view, cx, Editor::move_down);
 180        register_action(view, cx, Editor::move_down_by_lines);
 181        register_action(view, cx, Editor::select_down_by_lines);
 182        register_action(view, cx, Editor::move_up);
 183        register_action(view, cx, Editor::move_up_by_lines);
 184        register_action(view, cx, Editor::select_up_by_lines);
 185        register_action(view, cx, Editor::select_page_down);
 186        register_action(view, cx, Editor::select_page_up);
 187        register_action(view, cx, Editor::cancel);
 188        register_action(view, cx, Editor::newline);
 189        register_action(view, cx, Editor::newline_above);
 190        register_action(view, cx, Editor::newline_below);
 191        register_action(view, cx, Editor::backspace);
 192        register_action(view, cx, Editor::delete);
 193        register_action(view, cx, Editor::tab);
 194        register_action(view, cx, Editor::tab_prev);
 195        register_action(view, cx, Editor::indent);
 196        register_action(view, cx, Editor::outdent);
 197        register_action(view, cx, Editor::autoindent);
 198        register_action(view, cx, Editor::delete_line);
 199        register_action(view, cx, Editor::join_lines);
 200        register_action(view, cx, Editor::sort_lines_case_sensitive);
 201        register_action(view, cx, Editor::sort_lines_case_insensitive);
 202        register_action(view, cx, Editor::reverse_lines);
 203        register_action(view, cx, Editor::shuffle_lines);
 204        register_action(view, cx, Editor::convert_to_upper_case);
 205        register_action(view, cx, Editor::convert_to_lower_case);
 206        register_action(view, cx, Editor::convert_to_title_case);
 207        register_action(view, cx, Editor::convert_to_snake_case);
 208        register_action(view, cx, Editor::convert_to_kebab_case);
 209        register_action(view, cx, Editor::convert_to_upper_camel_case);
 210        register_action(view, cx, Editor::convert_to_lower_camel_case);
 211        register_action(view, cx, Editor::convert_to_opposite_case);
 212        register_action(view, cx, Editor::delete_to_previous_word_start);
 213        register_action(view, cx, Editor::delete_to_previous_subword_start);
 214        register_action(view, cx, Editor::delete_to_next_word_end);
 215        register_action(view, cx, Editor::delete_to_next_subword_end);
 216        register_action(view, cx, Editor::delete_to_beginning_of_line);
 217        register_action(view, cx, Editor::delete_to_end_of_line);
 218        register_action(view, cx, Editor::cut_to_end_of_line);
 219        register_action(view, cx, Editor::duplicate_line_up);
 220        register_action(view, cx, Editor::duplicate_line_down);
 221        register_action(view, cx, Editor::duplicate_selection);
 222        register_action(view, cx, Editor::move_line_up);
 223        register_action(view, cx, Editor::move_line_down);
 224        register_action(view, cx, Editor::transpose);
 225        register_action(view, cx, Editor::rewrap);
 226        register_action(view, cx, Editor::cut);
 227        register_action(view, cx, Editor::kill_ring_cut);
 228        register_action(view, cx, Editor::kill_ring_yank);
 229        register_action(view, cx, Editor::copy);
 230        register_action(view, cx, Editor::paste);
 231        register_action(view, cx, Editor::undo);
 232        register_action(view, cx, Editor::redo);
 233        register_action(view, cx, Editor::move_page_up);
 234        register_action(view, cx, Editor::move_page_down);
 235        register_action(view, cx, Editor::next_screen);
 236        register_action(view, cx, Editor::scroll_cursor_top);
 237        register_action(view, cx, Editor::scroll_cursor_center);
 238        register_action(view, cx, Editor::scroll_cursor_bottom);
 239        register_action(view, cx, Editor::scroll_cursor_center_top_bottom);
 240        register_action(view, cx, |editor, _: &LineDown, cx| {
 241            editor.scroll_screen(&ScrollAmount::Line(1.), cx)
 242        });
 243        register_action(view, cx, |editor, _: &LineUp, cx| {
 244            editor.scroll_screen(&ScrollAmount::Line(-1.), cx)
 245        });
 246        register_action(view, cx, |editor, _: &HalfPageDown, cx| {
 247            editor.scroll_screen(&ScrollAmount::Page(0.5), cx)
 248        });
 249        register_action(view, cx, |editor, HandleInput(text): &HandleInput, cx| {
 250            if text.is_empty() {
 251                return;
 252            }
 253            editor.handle_input(text, cx);
 254        });
 255        register_action(view, cx, |editor, _: &HalfPageUp, cx| {
 256            editor.scroll_screen(&ScrollAmount::Page(-0.5), cx)
 257        });
 258        register_action(view, cx, |editor, _: &PageDown, cx| {
 259            editor.scroll_screen(&ScrollAmount::Page(1.), cx)
 260        });
 261        register_action(view, cx, |editor, _: &PageUp, cx| {
 262            editor.scroll_screen(&ScrollAmount::Page(-1.), cx)
 263        });
 264        register_action(view, cx, Editor::move_to_previous_word_start);
 265        register_action(view, cx, Editor::move_to_previous_subword_start);
 266        register_action(view, cx, Editor::move_to_next_word_end);
 267        register_action(view, cx, Editor::move_to_next_subword_end);
 268        register_action(view, cx, Editor::move_to_beginning_of_line);
 269        register_action(view, cx, Editor::move_to_end_of_line);
 270        register_action(view, cx, Editor::move_to_start_of_paragraph);
 271        register_action(view, cx, Editor::move_to_end_of_paragraph);
 272        register_action(view, cx, Editor::move_to_beginning);
 273        register_action(view, cx, Editor::move_to_end);
 274        register_action(view, cx, Editor::select_up);
 275        register_action(view, cx, Editor::select_down);
 276        register_action(view, cx, Editor::select_left);
 277        register_action(view, cx, Editor::select_right);
 278        register_action(view, cx, Editor::select_to_previous_word_start);
 279        register_action(view, cx, Editor::select_to_previous_subword_start);
 280        register_action(view, cx, Editor::select_to_next_word_end);
 281        register_action(view, cx, Editor::select_to_next_subword_end);
 282        register_action(view, cx, Editor::select_to_beginning_of_line);
 283        register_action(view, cx, Editor::select_to_end_of_line);
 284        register_action(view, cx, Editor::select_to_start_of_paragraph);
 285        register_action(view, cx, Editor::select_to_end_of_paragraph);
 286        register_action(view, cx, Editor::select_to_beginning);
 287        register_action(view, cx, Editor::select_to_end);
 288        register_action(view, cx, Editor::select_all);
 289        register_action(view, cx, |editor, action, cx| {
 290            editor.select_all_matches(action, cx).log_err();
 291        });
 292        register_action(view, cx, Editor::select_line);
 293        register_action(view, cx, Editor::split_selection_into_lines);
 294        register_action(view, cx, Editor::add_selection_above);
 295        register_action(view, cx, Editor::add_selection_below);
 296        register_action(view, cx, |editor, action, cx| {
 297            editor.select_next(action, cx).log_err();
 298        });
 299        register_action(view, cx, |editor, action, cx| {
 300            editor.select_previous(action, cx).log_err();
 301        });
 302        register_action(view, cx, Editor::toggle_comments);
 303        register_action(view, cx, Editor::select_larger_syntax_node);
 304        register_action(view, cx, Editor::select_smaller_syntax_node);
 305        register_action(view, cx, Editor::select_enclosing_symbol);
 306        register_action(view, cx, Editor::move_to_enclosing_bracket);
 307        register_action(view, cx, Editor::undo_selection);
 308        register_action(view, cx, Editor::redo_selection);
 309        if !view.read(cx).is_singleton(cx) {
 310            register_action(view, cx, Editor::expand_excerpts);
 311            register_action(view, cx, Editor::expand_excerpts_up);
 312            register_action(view, cx, Editor::expand_excerpts_down);
 313        }
 314        register_action(view, cx, Editor::go_to_diagnostic);
 315        register_action(view, cx, Editor::go_to_prev_diagnostic);
 316        register_action(view, cx, Editor::go_to_next_hunk);
 317        register_action(view, cx, Editor::go_to_prev_hunk);
 318        register_action(view, cx, |editor, a, cx| {
 319            editor.go_to_definition(a, cx).detach_and_log_err(cx);
 320        });
 321        register_action(view, cx, |editor, a, cx| {
 322            editor.go_to_definition_split(a, cx).detach_and_log_err(cx);
 323        });
 324        register_action(view, cx, |editor, a, cx| {
 325            editor.go_to_declaration(a, cx).detach_and_log_err(cx);
 326        });
 327        register_action(view, cx, |editor, a, cx| {
 328            editor.go_to_declaration_split(a, cx).detach_and_log_err(cx);
 329        });
 330        register_action(view, cx, |editor, a, cx| {
 331            editor.go_to_implementation(a, cx).detach_and_log_err(cx);
 332        });
 333        register_action(view, cx, |editor, a, cx| {
 334            editor
 335                .go_to_implementation_split(a, cx)
 336                .detach_and_log_err(cx);
 337        });
 338        register_action(view, cx, |editor, a, cx| {
 339            editor.go_to_type_definition(a, cx).detach_and_log_err(cx);
 340        });
 341        register_action(view, cx, |editor, a, cx| {
 342            editor
 343                .go_to_type_definition_split(a, cx)
 344                .detach_and_log_err(cx);
 345        });
 346        register_action(view, cx, Editor::open_url);
 347        register_action(view, cx, Editor::open_file);
 348        register_action(view, cx, Editor::fold);
 349        register_action(view, cx, Editor::fold_at_level);
 350        register_action(view, cx, Editor::fold_all);
 351        register_action(view, cx, Editor::fold_function_bodies);
 352        register_action(view, cx, Editor::fold_at);
 353        register_action(view, cx, Editor::fold_recursive);
 354        register_action(view, cx, Editor::toggle_fold);
 355        register_action(view, cx, Editor::toggle_fold_recursive);
 356        register_action(view, cx, Editor::unfold_lines);
 357        register_action(view, cx, Editor::unfold_recursive);
 358        register_action(view, cx, Editor::unfold_all);
 359        register_action(view, cx, Editor::unfold_at);
 360        register_action(view, cx, Editor::fold_selected_ranges);
 361        register_action(view, cx, Editor::show_completions);
 362        register_action(view, cx, Editor::toggle_code_actions);
 363        register_action(view, cx, Editor::open_excerpts);
 364        register_action(view, cx, Editor::open_excerpts_in_split);
 365        register_action(view, cx, Editor::open_proposed_changes_editor);
 366        register_action(view, cx, Editor::toggle_soft_wrap);
 367        register_action(view, cx, Editor::toggle_tab_bar);
 368        register_action(view, cx, Editor::toggle_line_numbers);
 369        register_action(view, cx, Editor::toggle_relative_line_numbers);
 370        register_action(view, cx, Editor::toggle_indent_guides);
 371        register_action(view, cx, Editor::toggle_inlay_hints);
 372        register_action(view, cx, Editor::toggle_inline_completions);
 373        register_action(view, cx, hover_popover::hover);
 374        register_action(view, cx, Editor::reveal_in_finder);
 375        register_action(view, cx, Editor::copy_path);
 376        register_action(view, cx, Editor::copy_relative_path);
 377        register_action(view, cx, Editor::copy_highlight_json);
 378        register_action(view, cx, Editor::copy_permalink_to_line);
 379        register_action(view, cx, Editor::open_permalink_to_line);
 380        register_action(view, cx, Editor::copy_file_location);
 381        register_action(view, cx, Editor::toggle_git_blame);
 382        register_action(view, cx, Editor::toggle_git_blame_inline);
 383        register_action(view, cx, Editor::toggle_hunk_diff);
 384        register_action(view, cx, Editor::expand_all_hunk_diffs);
 385        register_action(view, cx, |editor, action, cx| {
 386            if let Some(task) = editor.format(action, cx) {
 387                task.detach_and_log_err(cx);
 388            } else {
 389                cx.propagate();
 390            }
 391        });
 392        register_action(view, cx, |editor, action, cx| {
 393            if let Some(task) = editor.format_selections(action, cx) {
 394                task.detach_and_log_err(cx);
 395            } else {
 396                cx.propagate();
 397            }
 398        });
 399        register_action(view, cx, Editor::restart_language_server);
 400        register_action(view, cx, Editor::cancel_language_server_work);
 401        register_action(view, cx, Editor::show_character_palette);
 402        register_action(view, cx, |editor, action, cx| {
 403            if let Some(task) = editor.confirm_completion(action, cx) {
 404                task.detach_and_log_err(cx);
 405            } else {
 406                cx.propagate();
 407            }
 408        });
 409        register_action(view, cx, |editor, action, cx| {
 410            if let Some(task) = editor.compose_completion(action, cx) {
 411                task.detach_and_log_err(cx);
 412            } else {
 413                cx.propagate();
 414            }
 415        });
 416        register_action(view, cx, |editor, action, cx| {
 417            if let Some(task) = editor.confirm_code_action(action, cx) {
 418                task.detach_and_log_err(cx);
 419            } else {
 420                cx.propagate();
 421            }
 422        });
 423        register_action(view, cx, |editor, action, cx| {
 424            if let Some(task) = editor.rename(action, cx) {
 425                task.detach_and_log_err(cx);
 426            } else {
 427                cx.propagate();
 428            }
 429        });
 430        register_action(view, cx, |editor, action, cx| {
 431            if let Some(task) = editor.confirm_rename(action, cx) {
 432                task.detach_and_log_err(cx);
 433            } else {
 434                cx.propagate();
 435            }
 436        });
 437        register_action(view, cx, |editor, action, cx| {
 438            if let Some(task) = editor.find_all_references(action, cx) {
 439                task.detach_and_log_err(cx);
 440            } else {
 441                cx.propagate();
 442            }
 443        });
 444        register_action(view, cx, Editor::show_signature_help);
 445        register_action(view, cx, Editor::next_inline_completion);
 446        register_action(view, cx, Editor::previous_inline_completion);
 447        register_action(view, cx, Editor::show_inline_completion);
 448        register_action(view, cx, Editor::context_menu_first);
 449        register_action(view, cx, Editor::context_menu_prev);
 450        register_action(view, cx, Editor::context_menu_next);
 451        register_action(view, cx, Editor::context_menu_last);
 452        register_action(view, cx, Editor::display_cursor_names);
 453        register_action(view, cx, Editor::unique_lines_case_insensitive);
 454        register_action(view, cx, Editor::unique_lines_case_sensitive);
 455        register_action(view, cx, Editor::accept_partial_inline_completion);
 456        register_action(view, cx, Editor::accept_inline_completion);
 457        register_action(view, cx, Editor::revert_file);
 458        register_action(view, cx, Editor::revert_selected_hunks);
 459        register_action(view, cx, Editor::apply_all_diff_hunks);
 460        register_action(view, cx, Editor::apply_selected_diff_hunks);
 461        register_action(view, cx, Editor::open_active_item_in_terminal);
 462        register_action(view, cx, Editor::reload_file);
 463        register_action(view, cx, Editor::spawn_nearest_task);
 464        register_action(view, cx, Editor::insert_uuid_v4);
 465        register_action(view, cx, Editor::insert_uuid_v7);
 466    }
 467
 468    fn register_key_listeners(&self, cx: &mut WindowContext, layout: &EditorLayout) {
 469        let position_map = layout.position_map.clone();
 470        cx.on_key_event({
 471            let editor = self.editor.clone();
 472            let text_hitbox = layout.text_hitbox.clone();
 473            move |event: &ModifiersChangedEvent, phase, cx| {
 474                if phase != DispatchPhase::Bubble {
 475                    return;
 476                }
 477                editor.update(cx, |editor, cx| {
 478                    if editor.hover_state.focused(cx) {
 479                        return;
 480                    }
 481                    Self::modifiers_changed(editor, event, &position_map, &text_hitbox, cx)
 482                })
 483            }
 484        });
 485    }
 486
 487    fn modifiers_changed(
 488        editor: &mut Editor,
 489        event: &ModifiersChangedEvent,
 490        position_map: &PositionMap,
 491        text_hitbox: &Hitbox,
 492        cx: &mut ViewContext<Editor>,
 493    ) {
 494        let mouse_position = cx.mouse_position();
 495        if !text_hitbox.is_hovered(cx) {
 496            return;
 497        }
 498
 499        editor.update_hovered_link(
 500            position_map.point_for_position(text_hitbox.bounds, mouse_position),
 501            &position_map.snapshot,
 502            event.modifiers,
 503            cx,
 504        )
 505    }
 506
 507    fn mouse_left_down(
 508        editor: &mut Editor,
 509        event: &MouseDownEvent,
 510        hovered_hunk: Option<HoveredHunk>,
 511        position_map: &PositionMap,
 512        text_hitbox: &Hitbox,
 513        gutter_hitbox: &Hitbox,
 514        cx: &mut ViewContext<Editor>,
 515    ) {
 516        if cx.default_prevented() {
 517            return;
 518        }
 519
 520        let mut click_count = event.click_count;
 521        let mut modifiers = event.modifiers;
 522
 523        if let Some(hovered_hunk) = hovered_hunk {
 524            editor.toggle_hovered_hunk(&hovered_hunk, cx);
 525            cx.notify();
 526            return;
 527        } else if gutter_hitbox.is_hovered(cx) {
 528            click_count = 3; // Simulate triple-click when clicking the gutter to select lines
 529        } else if !text_hitbox.is_hovered(cx) {
 530            return;
 531        }
 532
 533        if click_count == 2 && !editor.buffer().read(cx).is_singleton() {
 534            match EditorSettings::get_global(cx).double_click_in_multibuffer {
 535                DoubleClickInMultibuffer::Select => {
 536                    // do nothing special on double click, all selection logic is below
 537                }
 538                DoubleClickInMultibuffer::Open => {
 539                    if modifiers.alt {
 540                        // if double click is made with alt, pretend it's a regular double click without opening and alt,
 541                        // and run the selection logic.
 542                        modifiers.alt = false;
 543                    } else {
 544                        // if double click is made without alt, open the corresponding excerp
 545                        editor.open_excerpts(&OpenExcerpts, cx);
 546                        return;
 547                    }
 548                }
 549            }
 550        }
 551
 552        let point_for_position =
 553            position_map.point_for_position(text_hitbox.bounds, event.position);
 554        let position = point_for_position.previous_valid;
 555        if modifiers.shift && modifiers.alt {
 556            editor.select(
 557                SelectPhase::BeginColumnar {
 558                    position,
 559                    reset: false,
 560                    goal_column: point_for_position.exact_unclipped.column(),
 561                },
 562                cx,
 563            );
 564        } else if modifiers.shift && !modifiers.control && !modifiers.alt && !modifiers.secondary()
 565        {
 566            editor.select(
 567                SelectPhase::Extend {
 568                    position,
 569                    click_count,
 570                },
 571                cx,
 572            );
 573        } else {
 574            let multi_cursor_setting = EditorSettings::get_global(cx).multi_cursor_modifier;
 575            let multi_cursor_modifier = match multi_cursor_setting {
 576                MultiCursorModifier::Alt => modifiers.alt,
 577                MultiCursorModifier::CmdOrCtrl => modifiers.secondary(),
 578            };
 579            editor.select(
 580                SelectPhase::Begin {
 581                    position,
 582                    add: multi_cursor_modifier,
 583                    click_count,
 584                },
 585                cx,
 586            );
 587        }
 588
 589        cx.stop_propagation();
 590    }
 591
 592    fn mouse_right_down(
 593        editor: &mut Editor,
 594        event: &MouseDownEvent,
 595        position_map: &PositionMap,
 596        text_hitbox: &Hitbox,
 597        cx: &mut ViewContext<Editor>,
 598    ) {
 599        if !text_hitbox.is_hovered(cx) {
 600            return;
 601        }
 602        let point_for_position =
 603            position_map.point_for_position(text_hitbox.bounds, event.position);
 604        mouse_context_menu::deploy_context_menu(
 605            editor,
 606            Some(event.position),
 607            point_for_position.previous_valid,
 608            cx,
 609        );
 610        cx.stop_propagation();
 611    }
 612
 613    fn mouse_middle_down(
 614        editor: &mut Editor,
 615        event: &MouseDownEvent,
 616        position_map: &PositionMap,
 617        text_hitbox: &Hitbox,
 618        cx: &mut ViewContext<Editor>,
 619    ) {
 620        if !text_hitbox.is_hovered(cx) || cx.default_prevented() {
 621            return;
 622        }
 623
 624        let point_for_position =
 625            position_map.point_for_position(text_hitbox.bounds, event.position);
 626        let position = point_for_position.previous_valid;
 627
 628        editor.select(
 629            SelectPhase::BeginColumnar {
 630                position,
 631                reset: true,
 632                goal_column: point_for_position.exact_unclipped.column(),
 633            },
 634            cx,
 635        );
 636    }
 637
 638    fn mouse_up(
 639        editor: &mut Editor,
 640        event: &MouseUpEvent,
 641        position_map: &PositionMap,
 642        text_hitbox: &Hitbox,
 643        cx: &mut ViewContext<Editor>,
 644    ) {
 645        let end_selection = editor.has_pending_selection();
 646        let pending_nonempty_selections = editor.has_pending_nonempty_selection();
 647
 648        if end_selection {
 649            editor.select(SelectPhase::End, cx);
 650        }
 651
 652        let multi_cursor_setting = EditorSettings::get_global(cx).multi_cursor_modifier;
 653        let multi_cursor_modifier = match multi_cursor_setting {
 654            MultiCursorModifier::Alt => event.modifiers.secondary(),
 655            MultiCursorModifier::CmdOrCtrl => event.modifiers.alt,
 656        };
 657
 658        if !pending_nonempty_selections && multi_cursor_modifier && text_hitbox.is_hovered(cx) {
 659            let point = position_map.point_for_position(text_hitbox.bounds, event.position);
 660            editor.handle_click_hovered_link(point, event.modifiers, cx);
 661
 662            cx.stop_propagation();
 663        } else if end_selection && pending_nonempty_selections {
 664            cx.stop_propagation();
 665        } else if cfg!(any(target_os = "linux", target_os = "freebsd"))
 666            && event.button == MouseButton::Middle
 667        {
 668            if !text_hitbox.is_hovered(cx) || editor.read_only(cx) {
 669                return;
 670            }
 671
 672            #[cfg(any(target_os = "linux", target_os = "freebsd"))]
 673            if EditorSettings::get_global(cx).middle_click_paste {
 674                if let Some(text) = cx.read_from_primary().and_then(|item| item.text()) {
 675                    let point_for_position =
 676                        position_map.point_for_position(text_hitbox.bounds, event.position);
 677                    let position = point_for_position.previous_valid;
 678
 679                    editor.select(
 680                        SelectPhase::Begin {
 681                            position,
 682                            add: false,
 683                            click_count: 1,
 684                        },
 685                        cx,
 686                    );
 687                    editor.insert(&text, cx);
 688                }
 689                cx.stop_propagation()
 690            }
 691        }
 692    }
 693
 694    fn mouse_dragged(
 695        editor: &mut Editor,
 696        event: &MouseMoveEvent,
 697        position_map: &PositionMap,
 698        text_bounds: Bounds<Pixels>,
 699        cx: &mut ViewContext<Editor>,
 700    ) {
 701        if !editor.has_pending_selection() {
 702            return;
 703        }
 704
 705        let point_for_position = position_map.point_for_position(text_bounds, event.position);
 706        let mut scroll_delta = gpui::Point::<f32>::default();
 707        let vertical_margin = position_map.line_height.min(text_bounds.size.height / 3.0);
 708        let top = text_bounds.origin.y + vertical_margin;
 709        let bottom = text_bounds.lower_left().y - vertical_margin;
 710        if event.position.y < top {
 711            scroll_delta.y = -scale_vertical_mouse_autoscroll_delta(top - event.position.y);
 712        }
 713        if event.position.y > bottom {
 714            scroll_delta.y = scale_vertical_mouse_autoscroll_delta(event.position.y - bottom);
 715        }
 716
 717        let horizontal_margin = position_map.line_height.min(text_bounds.size.width / 3.0);
 718        let left = text_bounds.origin.x + horizontal_margin;
 719        let right = text_bounds.upper_right().x - horizontal_margin;
 720        if event.position.x < left {
 721            scroll_delta.x = -scale_horizontal_mouse_autoscroll_delta(left - event.position.x);
 722        }
 723        if event.position.x > right {
 724            scroll_delta.x = scale_horizontal_mouse_autoscroll_delta(event.position.x - right);
 725        }
 726
 727        editor.select(
 728            SelectPhase::Update {
 729                position: point_for_position.previous_valid,
 730                goal_column: point_for_position.exact_unclipped.column(),
 731                scroll_delta,
 732            },
 733            cx,
 734        );
 735    }
 736
 737    fn mouse_moved(
 738        editor: &mut Editor,
 739        event: &MouseMoveEvent,
 740        position_map: &PositionMap,
 741        text_hitbox: &Hitbox,
 742        gutter_hitbox: &Hitbox,
 743        cx: &mut ViewContext<Editor>,
 744    ) {
 745        let modifiers = event.modifiers;
 746        let gutter_hovered = gutter_hitbox.is_hovered(cx);
 747        editor.set_gutter_hovered(gutter_hovered, cx);
 748
 749        // Don't trigger hover popover if mouse is hovering over context menu
 750        if text_hitbox.is_hovered(cx) {
 751            let point_for_position =
 752                position_map.point_for_position(text_hitbox.bounds, event.position);
 753
 754            editor.update_hovered_link(point_for_position, &position_map.snapshot, modifiers, cx);
 755
 756            if let Some(point) = point_for_position.as_valid() {
 757                let anchor = position_map
 758                    .snapshot
 759                    .buffer_snapshot
 760                    .anchor_before(point.to_offset(&position_map.snapshot, Bias::Left));
 761                hover_at(editor, Some(anchor), cx);
 762                Self::update_visible_cursor(editor, point, position_map, cx);
 763            } else {
 764                hover_at(editor, None, cx);
 765            }
 766        } else {
 767            editor.hide_hovered_link(cx);
 768            hover_at(editor, None, cx);
 769            if gutter_hovered {
 770                cx.stop_propagation();
 771            }
 772        }
 773    }
 774
 775    fn update_visible_cursor(
 776        editor: &mut Editor,
 777        point: DisplayPoint,
 778        position_map: &PositionMap,
 779        cx: &mut ViewContext<Editor>,
 780    ) {
 781        let snapshot = &position_map.snapshot;
 782        let Some(hub) = editor.collaboration_hub() else {
 783            return;
 784        };
 785        let start = snapshot.display_snapshot.clip_point(
 786            DisplayPoint::new(point.row(), point.column().saturating_sub(1)),
 787            Bias::Left,
 788        );
 789        let end = snapshot.display_snapshot.clip_point(
 790            DisplayPoint::new(
 791                point.row(),
 792                (point.column() + 1).min(snapshot.line_len(point.row())),
 793            ),
 794            Bias::Right,
 795        );
 796
 797        let range = snapshot
 798            .buffer_snapshot
 799            .anchor_at(start.to_point(&snapshot.display_snapshot), Bias::Left)
 800            ..snapshot
 801                .buffer_snapshot
 802                .anchor_at(end.to_point(&snapshot.display_snapshot), Bias::Right);
 803
 804        let Some(selection) = snapshot.remote_selections_in_range(&range, hub, cx).next() else {
 805            return;
 806        };
 807        let key = crate::HoveredCursor {
 808            replica_id: selection.replica_id,
 809            selection_id: selection.selection.id,
 810        };
 811        editor.hovered_cursors.insert(
 812            key.clone(),
 813            cx.spawn(|editor, mut cx| async move {
 814                cx.background_executor().timer(CURSORS_VISIBLE_FOR).await;
 815                editor
 816                    .update(&mut cx, |editor, cx| {
 817                        editor.hovered_cursors.remove(&key);
 818                        cx.notify();
 819                    })
 820                    .ok();
 821            }),
 822        );
 823        cx.notify()
 824    }
 825
 826    #[allow(clippy::too_many_arguments)]
 827    fn layout_selections(
 828        &self,
 829        start_anchor: Anchor,
 830        end_anchor: Anchor,
 831        local_selections: &[Selection<Point>],
 832        snapshot: &EditorSnapshot,
 833        start_row: DisplayRow,
 834        end_row: DisplayRow,
 835        cx: &mut WindowContext,
 836    ) -> (
 837        Vec<(PlayerColor, Vec<SelectionLayout>)>,
 838        BTreeMap<DisplayRow, bool>,
 839        Option<DisplayPoint>,
 840    ) {
 841        let mut selections: Vec<(PlayerColor, Vec<SelectionLayout>)> = Vec::new();
 842        let mut active_rows = BTreeMap::new();
 843        let mut newest_selection_head = None;
 844        self.editor.update(cx, |editor, cx| {
 845            if editor.show_local_selections {
 846                let mut layouts = Vec::new();
 847                let newest = editor.selections.newest(cx);
 848                for selection in local_selections.iter().cloned() {
 849                    let is_empty = selection.start == selection.end;
 850                    let is_newest = selection == newest;
 851
 852                    let layout = SelectionLayout::new(
 853                        selection,
 854                        editor.selections.line_mode,
 855                        editor.cursor_shape,
 856                        &snapshot.display_snapshot,
 857                        is_newest,
 858                        editor.leader_peer_id.is_none(),
 859                        None,
 860                    );
 861                    if is_newest {
 862                        newest_selection_head = Some(layout.head);
 863                    }
 864
 865                    for row in cmp::max(layout.active_rows.start.0, start_row.0)
 866                        ..=cmp::min(layout.active_rows.end.0, end_row.0)
 867                    {
 868                        let contains_non_empty_selection =
 869                            active_rows.entry(DisplayRow(row)).or_insert(!is_empty);
 870                        *contains_non_empty_selection |= !is_empty;
 871                    }
 872                    layouts.push(layout);
 873                }
 874
 875                let player = if editor.read_only(cx) {
 876                    cx.theme().players().read_only()
 877                } else {
 878                    self.style.local_player
 879                };
 880
 881                selections.push((player, layouts));
 882            }
 883
 884            if let Some(collaboration_hub) = &editor.collaboration_hub {
 885                // When following someone, render the local selections in their color.
 886                if let Some(leader_id) = editor.leader_peer_id {
 887                    if let Some(collaborator) = collaboration_hub.collaborators(cx).get(&leader_id)
 888                    {
 889                        if let Some(participant_index) = collaboration_hub
 890                            .user_participant_indices(cx)
 891                            .get(&collaborator.user_id)
 892                        {
 893                            if let Some((local_selection_style, _)) = selections.first_mut() {
 894                                *local_selection_style = cx
 895                                    .theme()
 896                                    .players()
 897                                    .color_for_participant(participant_index.0);
 898                            }
 899                        }
 900                    }
 901                }
 902
 903                let mut remote_selections = HashMap::default();
 904                for selection in snapshot.remote_selections_in_range(
 905                    &(start_anchor..end_anchor),
 906                    collaboration_hub.as_ref(),
 907                    cx,
 908                ) {
 909                    let selection_style =
 910                        Self::get_participant_color(selection.participant_index, cx);
 911
 912                    // Don't re-render the leader's selections, since the local selections
 913                    // match theirs.
 914                    if Some(selection.peer_id) == editor.leader_peer_id {
 915                        continue;
 916                    }
 917                    let key = HoveredCursor {
 918                        replica_id: selection.replica_id,
 919                        selection_id: selection.selection.id,
 920                    };
 921
 922                    let is_shown =
 923                        editor.show_cursor_names || editor.hovered_cursors.contains_key(&key);
 924
 925                    remote_selections
 926                        .entry(selection.replica_id)
 927                        .or_insert((selection_style, Vec::new()))
 928                        .1
 929                        .push(SelectionLayout::new(
 930                            selection.selection,
 931                            selection.line_mode,
 932                            selection.cursor_shape,
 933                            &snapshot.display_snapshot,
 934                            false,
 935                            false,
 936                            if is_shown { selection.user_name } else { None },
 937                        ));
 938                }
 939
 940                selections.extend(remote_selections.into_values());
 941            } else if !editor.is_focused(cx) && editor.show_cursor_when_unfocused {
 942                let player = if editor.read_only(cx) {
 943                    cx.theme().players().read_only()
 944                } else {
 945                    self.style.local_player
 946                };
 947                let layouts = snapshot
 948                    .buffer_snapshot
 949                    .selections_in_range(&(start_anchor..end_anchor), true)
 950                    .map(move |(_, line_mode, cursor_shape, selection)| {
 951                        SelectionLayout::new(
 952                            selection,
 953                            line_mode,
 954                            cursor_shape,
 955                            &snapshot.display_snapshot,
 956                            false,
 957                            false,
 958                            None,
 959                        )
 960                    })
 961                    .collect::<Vec<_>>();
 962                selections.push((player, layouts));
 963            }
 964        });
 965        (selections, active_rows, newest_selection_head)
 966    }
 967
 968    fn collect_cursors(
 969        &self,
 970        snapshot: &EditorSnapshot,
 971        cx: &mut WindowContext,
 972    ) -> Vec<(DisplayPoint, Hsla)> {
 973        let editor = self.editor.read(cx);
 974        let mut cursors = Vec::new();
 975        let mut skip_local = false;
 976        let mut add_cursor = |anchor: Anchor, color| {
 977            cursors.push((anchor.to_display_point(&snapshot.display_snapshot), color));
 978        };
 979        // Remote cursors
 980        if let Some(collaboration_hub) = &editor.collaboration_hub {
 981            for remote_selection in snapshot.remote_selections_in_range(
 982                &(Anchor::min()..Anchor::max()),
 983                collaboration_hub.deref(),
 984                cx,
 985            ) {
 986                let color = Self::get_participant_color(remote_selection.participant_index, cx);
 987                add_cursor(remote_selection.selection.head(), color.cursor);
 988                if Some(remote_selection.peer_id) == editor.leader_peer_id {
 989                    skip_local = true;
 990                }
 991            }
 992        }
 993        // Local cursors
 994        if !skip_local {
 995            let color = cx.theme().players().local().cursor;
 996            editor.selections.disjoint.iter().for_each(|selection| {
 997                add_cursor(selection.head(), color);
 998            });
 999            if let Some(ref selection) = editor.selections.pending_anchor() {
1000                add_cursor(selection.head(), color);
1001            }
1002        }
1003        cursors
1004    }
1005
1006    #[allow(clippy::too_many_arguments)]
1007    fn layout_visible_cursors(
1008        &self,
1009        snapshot: &EditorSnapshot,
1010        selections: &[(PlayerColor, Vec<SelectionLayout>)],
1011        block_start_rows: &HashSet<DisplayRow>,
1012        visible_display_row_range: Range<DisplayRow>,
1013        line_layouts: &[LineWithInvisibles],
1014        text_hitbox: &Hitbox,
1015        content_origin: gpui::Point<Pixels>,
1016        scroll_position: gpui::Point<f32>,
1017        scroll_pixel_position: gpui::Point<Pixels>,
1018        line_height: Pixels,
1019        em_width: Pixels,
1020        autoscroll_containing_element: bool,
1021        cx: &mut WindowContext,
1022    ) -> Vec<CursorLayout> {
1023        let mut autoscroll_bounds = None;
1024        let cursor_layouts = self.editor.update(cx, |editor, cx| {
1025            let mut cursors = Vec::new();
1026            for (player_color, selections) in selections {
1027                for selection in selections {
1028                    let cursor_position = selection.head;
1029
1030                    let in_range = visible_display_row_range.contains(&cursor_position.row());
1031                    if (selection.is_local && !editor.show_local_cursors(cx))
1032                        || !in_range
1033                        || block_start_rows.contains(&cursor_position.row())
1034                    {
1035                        continue;
1036                    }
1037
1038                    let cursor_row_layout = &line_layouts
1039                        [cursor_position.row().minus(visible_display_row_range.start) as usize];
1040                    let cursor_column = cursor_position.column() as usize;
1041
1042                    let cursor_character_x = cursor_row_layout.x_for_index(cursor_column);
1043                    let mut block_width =
1044                        cursor_row_layout.x_for_index(cursor_column + 1) - cursor_character_x;
1045                    if block_width == Pixels::ZERO {
1046                        block_width = em_width;
1047                    }
1048                    let block_text = if let CursorShape::Block = selection.cursor_shape {
1049                        snapshot
1050                            .grapheme_at(cursor_position)
1051                            .or_else(|| {
1052                                if cursor_column == 0 {
1053                                    snapshot.placeholder_text().and_then(|s| {
1054                                        s.graphemes(true).next().map(|s| s.to_string().into())
1055                                    })
1056                                } else {
1057                                    None
1058                                }
1059                            })
1060                            .and_then(|text| {
1061                                let len = text.len();
1062
1063                                let font = cursor_row_layout
1064                                    .font_id_for_index(cursor_column)
1065                                    .and_then(|cursor_font_id| {
1066                                        cx.text_system().get_font_for_id(cursor_font_id)
1067                                    })
1068                                    .unwrap_or(self.style.text.font());
1069
1070                                // Invert the text color for the block cursor. Ensure that the text
1071                                // color is opaque enough to be visible against the background color.
1072                                //
1073                                // 0.75 is an arbitrary threshold to determine if the background color is
1074                                // opaque enough to use as a text color.
1075                                //
1076                                // TODO: In the future we should ensure themes have a `text_inverse` color.
1077                                let color = if cx.theme().colors().editor_background.a < 0.75 {
1078                                    match cx.theme().appearance {
1079                                        Appearance::Dark => Hsla::black(),
1080                                        Appearance::Light => Hsla::white(),
1081                                    }
1082                                } else {
1083                                    cx.theme().colors().editor_background
1084                                };
1085
1086                                cx.text_system()
1087                                    .shape_line(
1088                                        text,
1089                                        cursor_row_layout.font_size,
1090                                        &[TextRun {
1091                                            len,
1092                                            font,
1093                                            color,
1094                                            background_color: None,
1095                                            strikethrough: None,
1096                                            underline: None,
1097                                        }],
1098                                    )
1099                                    .log_err()
1100                            })
1101                    } else {
1102                        None
1103                    };
1104
1105                    let x = cursor_character_x - scroll_pixel_position.x;
1106                    let y = (cursor_position.row().as_f32()
1107                        - scroll_pixel_position.y / line_height)
1108                        * line_height;
1109                    if selection.is_newest {
1110                        editor.pixel_position_of_newest_cursor = Some(point(
1111                            text_hitbox.origin.x + x + block_width / 2.,
1112                            text_hitbox.origin.y + y + line_height / 2.,
1113                        ));
1114
1115                        if autoscroll_containing_element {
1116                            let top = text_hitbox.origin.y
1117                                + (cursor_position.row().as_f32() - scroll_position.y - 3.).max(0.)
1118                                    * line_height;
1119                            let left = text_hitbox.origin.x
1120                                + (cursor_position.column() as f32 - scroll_position.x - 3.)
1121                                    .max(0.)
1122                                    * em_width;
1123
1124                            let bottom = text_hitbox.origin.y
1125                                + (cursor_position.row().as_f32() - scroll_position.y + 4.)
1126                                    * line_height;
1127                            let right = text_hitbox.origin.x
1128                                + (cursor_position.column() as f32 - scroll_position.x + 4.)
1129                                    * em_width;
1130
1131                            autoscroll_bounds =
1132                                Some(Bounds::from_corners(point(left, top), point(right, bottom)))
1133                        }
1134                    }
1135
1136                    let mut cursor = CursorLayout {
1137                        color: player_color.cursor,
1138                        block_width,
1139                        origin: point(x, y),
1140                        line_height,
1141                        shape: selection.cursor_shape,
1142                        block_text,
1143                        cursor_name: None,
1144                    };
1145                    let cursor_name = selection.user_name.clone().map(|name| CursorName {
1146                        string: name,
1147                        color: self.style.background,
1148                        is_top_row: cursor_position.row().0 == 0,
1149                    });
1150                    cursor.layout(content_origin, cursor_name, cx);
1151                    cursors.push(cursor);
1152                }
1153            }
1154            cursors
1155        });
1156
1157        if let Some(bounds) = autoscroll_bounds {
1158            cx.request_autoscroll(bounds);
1159        }
1160
1161        cursor_layouts
1162    }
1163
1164    fn layout_scrollbar(
1165        &self,
1166        snapshot: &EditorSnapshot,
1167        bounds: Bounds<Pixels>,
1168        scroll_position: gpui::Point<f32>,
1169        rows_per_page: f32,
1170        non_visible_cursors: bool,
1171        cx: &mut WindowContext,
1172    ) -> Option<ScrollbarLayout> {
1173        let scrollbar_settings = EditorSettings::get_global(cx).scrollbar;
1174        let show_scrollbars = match scrollbar_settings.show {
1175            ShowScrollbar::Auto => {
1176                let editor = self.editor.read(cx);
1177                let is_singleton = editor.is_singleton(cx);
1178                // Git
1179                (is_singleton && scrollbar_settings.git_diff && !snapshot.diff_map.is_empty())
1180                    ||
1181                    // Buffer Search Results
1182                    (is_singleton && scrollbar_settings.search_results && editor.has_background_highlights::<BufferSearchHighlights>())
1183                    ||
1184                    // Selected Symbol Occurrences
1185                    (is_singleton && scrollbar_settings.selected_symbol && (editor.has_background_highlights::<DocumentHighlightRead>() || editor.has_background_highlights::<DocumentHighlightWrite>()))
1186                    ||
1187                    // Diagnostics
1188                    (is_singleton && scrollbar_settings.diagnostics && snapshot.buffer_snapshot.has_diagnostics())
1189                    ||
1190                    // Cursors out of sight
1191                    non_visible_cursors
1192                    ||
1193                    // Scrollmanager
1194                    editor.scroll_manager.scrollbars_visible()
1195            }
1196            ShowScrollbar::System => self.editor.read(cx).scroll_manager.scrollbars_visible(),
1197            ShowScrollbar::Always => true,
1198            ShowScrollbar::Never => false,
1199        };
1200        if snapshot.mode != EditorMode::Full {
1201            return None;
1202        }
1203
1204        let visible_row_range = scroll_position.y..scroll_position.y + rows_per_page;
1205
1206        // If a drag took place after we started dragging the scrollbar,
1207        // cancel the scrollbar drag.
1208        if cx.has_active_drag() {
1209            self.editor.update(cx, |editor, cx| {
1210                editor.scroll_manager.set_is_dragging_scrollbar(false, cx);
1211            });
1212        }
1213
1214        let track_bounds = Bounds::from_corners(
1215            point(self.scrollbar_left(&bounds), bounds.origin.y),
1216            point(bounds.lower_right().x, bounds.lower_left().y),
1217        );
1218
1219        let settings = EditorSettings::get_global(cx);
1220        let scroll_beyond_last_line: f32 = match settings.scroll_beyond_last_line {
1221            ScrollBeyondLastLine::OnePage => rows_per_page,
1222            ScrollBeyondLastLine::Off => 1.0,
1223            ScrollBeyondLastLine::VerticalScrollMargin => 1.0 + settings.vertical_scroll_margin,
1224        };
1225        let total_rows =
1226            (snapshot.max_point().row().as_f32() + scroll_beyond_last_line).max(rows_per_page);
1227        let height = bounds.size.height;
1228        let px_per_row = height / total_rows;
1229        let thumb_height = (rows_per_page * px_per_row).max(ScrollbarLayout::MIN_THUMB_HEIGHT);
1230        let row_height = (height - thumb_height) / (total_rows - rows_per_page).max(0.);
1231
1232        Some(ScrollbarLayout {
1233            hitbox: cx.insert_hitbox(track_bounds, false),
1234            visible_row_range,
1235            row_height,
1236            visible: show_scrollbars,
1237            thumb_height,
1238        })
1239    }
1240
1241    #[allow(clippy::too_many_arguments)]
1242    fn prepaint_crease_toggles(
1243        &self,
1244        crease_toggles: &mut [Option<AnyElement>],
1245        line_height: Pixels,
1246        gutter_dimensions: &GutterDimensions,
1247        gutter_settings: crate::editor_settings::Gutter,
1248        scroll_pixel_position: gpui::Point<Pixels>,
1249        gutter_hitbox: &Hitbox,
1250        cx: &mut WindowContext,
1251    ) {
1252        for (ix, crease_toggle) in crease_toggles.iter_mut().enumerate() {
1253            if let Some(crease_toggle) = crease_toggle {
1254                debug_assert!(gutter_settings.folds);
1255                let available_space = size(
1256                    AvailableSpace::MinContent,
1257                    AvailableSpace::Definite(line_height * 0.55),
1258                );
1259                let crease_toggle_size = crease_toggle.layout_as_root(available_space, cx);
1260
1261                let position = point(
1262                    gutter_dimensions.width - gutter_dimensions.right_padding,
1263                    ix as f32 * line_height - (scroll_pixel_position.y % line_height),
1264                );
1265                let centering_offset = point(
1266                    (gutter_dimensions.fold_area_width() - crease_toggle_size.width) / 2.,
1267                    (line_height - crease_toggle_size.height) / 2.,
1268                );
1269                let origin = gutter_hitbox.origin + position + centering_offset;
1270                crease_toggle.prepaint_as_root(origin, available_space, cx);
1271            }
1272        }
1273    }
1274
1275    #[allow(clippy::too_many_arguments)]
1276    fn prepaint_crease_trailers(
1277        &self,
1278        trailers: Vec<Option<AnyElement>>,
1279        lines: &[LineWithInvisibles],
1280        line_height: Pixels,
1281        content_origin: gpui::Point<Pixels>,
1282        scroll_pixel_position: gpui::Point<Pixels>,
1283        em_width: Pixels,
1284        cx: &mut WindowContext,
1285    ) -> Vec<Option<CreaseTrailerLayout>> {
1286        trailers
1287            .into_iter()
1288            .enumerate()
1289            .map(|(ix, element)| {
1290                let mut element = element?;
1291                let available_space = size(
1292                    AvailableSpace::MinContent,
1293                    AvailableSpace::Definite(line_height),
1294                );
1295                let size = element.layout_as_root(available_space, cx);
1296
1297                let line = &lines[ix];
1298                let padding = if line.width == Pixels::ZERO {
1299                    Pixels::ZERO
1300                } else {
1301                    4. * em_width
1302                };
1303                let position = point(
1304                    scroll_pixel_position.x + line.width + padding,
1305                    ix as f32 * line_height - (scroll_pixel_position.y % line_height),
1306                );
1307                let centering_offset = point(px(0.), (line_height - size.height) / 2.);
1308                let origin = content_origin + position + centering_offset;
1309                element.prepaint_as_root(origin, available_space, cx);
1310                Some(CreaseTrailerLayout {
1311                    element,
1312                    bounds: Bounds::new(origin, size),
1313                })
1314            })
1315            .collect()
1316    }
1317
1318    // Folds contained in a hunk are ignored apart from shrinking visual size
1319    // If a fold contains any hunks then that fold line is marked as modified
1320    fn layout_gutter_git_hunks(
1321        &self,
1322        line_height: Pixels,
1323        gutter_hitbox: &Hitbox,
1324        display_rows: Range<DisplayRow>,
1325        anchor_range: Range<Anchor>,
1326        snapshot: &EditorSnapshot,
1327        cx: &mut WindowContext,
1328    ) -> Vec<(DisplayDiffHunk, Option<Hitbox>)> {
1329        let buffer_snapshot = &snapshot.buffer_snapshot;
1330        let buffer_start = DisplayPoint::new(display_rows.start, 0).to_point(snapshot);
1331        let buffer_end = DisplayPoint::new(display_rows.end, 0).to_point(snapshot);
1332
1333        let git_gutter_setting = ProjectSettings::get_global(cx)
1334            .git
1335            .git_gutter
1336            .unwrap_or_default();
1337
1338        self.editor.update(cx, |editor, cx| {
1339            let expanded_hunks = &editor.diff_map.hunks;
1340            let expanded_hunks_start_ix = expanded_hunks
1341                .binary_search_by(|hunk| {
1342                    hunk.hunk_range
1343                        .end
1344                        .cmp(&anchor_range.start, &buffer_snapshot)
1345                        .then(Ordering::Less)
1346                })
1347                .unwrap_err();
1348            let mut expanded_hunks = expanded_hunks[expanded_hunks_start_ix..].iter().peekable();
1349
1350            let mut display_hunks: Vec<(DisplayDiffHunk, Option<Hitbox>)> = editor
1351                .diff_map
1352                .snapshot
1353                .diff_hunks_in_range(buffer_start..buffer_end, &buffer_snapshot)
1354                .filter_map(|hunk| {
1355                    let display_hunk = diff_hunk_to_display(&hunk, snapshot);
1356
1357                    if let DisplayDiffHunk::Unfolded {
1358                        multi_buffer_range,
1359                        status,
1360                        ..
1361                    } = &display_hunk
1362                    {
1363                        let mut is_expanded = false;
1364                        while let Some(expanded_hunk) = expanded_hunks.peek() {
1365                            match expanded_hunk
1366                                .hunk_range
1367                                .start
1368                                .cmp(&multi_buffer_range.start, &buffer_snapshot)
1369                            {
1370                                Ordering::Less => {
1371                                    expanded_hunks.next();
1372                                }
1373                                Ordering::Equal => {
1374                                    is_expanded = true;
1375                                    break;
1376                                }
1377                                Ordering::Greater => {
1378                                    break;
1379                                }
1380                            }
1381                        }
1382                        match status {
1383                            DiffHunkStatus::Added => {}
1384                            DiffHunkStatus::Modified => {}
1385                            DiffHunkStatus::Removed => {
1386                                if is_expanded {
1387                                    return None;
1388                                }
1389                            }
1390                        }
1391                    }
1392
1393                    Some(display_hunk)
1394                })
1395                .dedup()
1396                .map(|hunk| (hunk, None))
1397                .collect();
1398
1399            if let GitGutterSetting::TrackedFiles = git_gutter_setting {
1400                for (hunk, hitbox) in &mut display_hunks {
1401                    if let DisplayDiffHunk::Unfolded { .. } = hunk {
1402                        let hunk_bounds = Self::diff_hunk_bounds(
1403                            snapshot,
1404                            line_height,
1405                            gutter_hitbox.bounds,
1406                            &hunk,
1407                        );
1408                        *hitbox = Some(cx.insert_hitbox(hunk_bounds, true));
1409                    };
1410                }
1411            }
1412
1413            display_hunks
1414        })
1415    }
1416
1417    #[allow(clippy::too_many_arguments)]
1418    fn layout_inline_blame(
1419        &self,
1420        display_row: DisplayRow,
1421        display_snapshot: &DisplaySnapshot,
1422        line_layout: &LineWithInvisibles,
1423        crease_trailer: Option<&CreaseTrailerLayout>,
1424        em_width: Pixels,
1425        content_origin: gpui::Point<Pixels>,
1426        scroll_pixel_position: gpui::Point<Pixels>,
1427        line_height: Pixels,
1428        cx: &mut WindowContext,
1429    ) -> Option<AnyElement> {
1430        if !self
1431            .editor
1432            .update(cx, |editor, cx| editor.render_git_blame_inline(cx))
1433        {
1434            return None;
1435        }
1436
1437        let workspace = self
1438            .editor
1439            .read(cx)
1440            .workspace
1441            .as_ref()
1442            .map(|(w, _)| w.clone());
1443
1444        let display_point = DisplayPoint::new(display_row, 0);
1445        let buffer_row = MultiBufferRow(display_point.to_point(display_snapshot).row);
1446
1447        let blame = self.editor.read(cx).blame.clone()?;
1448        let blame_entry = blame
1449            .update(cx, |blame, cx| {
1450                blame.blame_for_rows([Some(buffer_row)], cx).next()
1451            })
1452            .flatten()?;
1453
1454        let mut element =
1455            render_inline_blame_entry(&blame, blame_entry, &self.style, workspace, cx);
1456
1457        let start_y = content_origin.y
1458            + line_height * (display_row.as_f32() - scroll_pixel_position.y / line_height);
1459
1460        let start_x = {
1461            const INLINE_BLAME_PADDING_EM_WIDTHS: f32 = 6.;
1462
1463            let line_end = if let Some(crease_trailer) = crease_trailer {
1464                crease_trailer.bounds.right()
1465            } else {
1466                content_origin.x - scroll_pixel_position.x + line_layout.width
1467            };
1468            let padded_line_end = line_end + em_width * INLINE_BLAME_PADDING_EM_WIDTHS;
1469
1470            let min_column_in_pixels = ProjectSettings::get_global(cx)
1471                .git
1472                .inline_blame
1473                .and_then(|settings| settings.min_column)
1474                .map(|col| self.column_pixels(col as usize, cx))
1475                .unwrap_or(px(0.));
1476            let min_start = content_origin.x - scroll_pixel_position.x + min_column_in_pixels;
1477
1478            cmp::max(padded_line_end, min_start)
1479        };
1480
1481        let absolute_offset = point(start_x, start_y);
1482        element.prepaint_as_root(absolute_offset, AvailableSpace::min_size(), cx);
1483
1484        Some(element)
1485    }
1486
1487    #[allow(clippy::too_many_arguments)]
1488    fn layout_blame_entries(
1489        &self,
1490        buffer_rows: impl Iterator<Item = Option<MultiBufferRow>>,
1491        em_width: Pixels,
1492        scroll_position: gpui::Point<f32>,
1493        line_height: Pixels,
1494        gutter_hitbox: &Hitbox,
1495        max_width: Option<Pixels>,
1496        cx: &mut WindowContext,
1497    ) -> Option<Vec<AnyElement>> {
1498        if !self
1499            .editor
1500            .update(cx, |editor, cx| editor.render_git_blame_gutter(cx))
1501        {
1502            return None;
1503        }
1504
1505        let blame = self.editor.read(cx).blame.clone()?;
1506        let blamed_rows: Vec<_> = blame.update(cx, |blame, cx| {
1507            blame.blame_for_rows(buffer_rows, cx).collect()
1508        });
1509
1510        let width = if let Some(max_width) = max_width {
1511            AvailableSpace::Definite(max_width)
1512        } else {
1513            AvailableSpace::MaxContent
1514        };
1515        let scroll_top = scroll_position.y * line_height;
1516        let start_x = em_width;
1517
1518        let mut last_used_color: Option<(PlayerColor, Oid)> = None;
1519
1520        let shaped_lines = blamed_rows
1521            .into_iter()
1522            .enumerate()
1523            .flat_map(|(ix, blame_entry)| {
1524                if let Some(blame_entry) = blame_entry {
1525                    let mut element = render_blame_entry(
1526                        ix,
1527                        &blame,
1528                        blame_entry,
1529                        &self.style,
1530                        &mut last_used_color,
1531                        self.editor.clone(),
1532                        cx,
1533                    );
1534
1535                    let start_y = ix as f32 * line_height - (scroll_top % line_height);
1536                    let absolute_offset = gutter_hitbox.origin + point(start_x, start_y);
1537
1538                    element.prepaint_as_root(
1539                        absolute_offset,
1540                        size(width, AvailableSpace::MinContent),
1541                        cx,
1542                    );
1543
1544                    Some(element)
1545                } else {
1546                    None
1547                }
1548            })
1549            .collect();
1550
1551        Some(shaped_lines)
1552    }
1553
1554    #[allow(clippy::too_many_arguments)]
1555    fn layout_indent_guides(
1556        &self,
1557        content_origin: gpui::Point<Pixels>,
1558        text_origin: gpui::Point<Pixels>,
1559        visible_buffer_range: Range<MultiBufferRow>,
1560        scroll_pixel_position: gpui::Point<Pixels>,
1561        line_height: Pixels,
1562        snapshot: &DisplaySnapshot,
1563        cx: &mut WindowContext,
1564    ) -> Option<Vec<IndentGuideLayout>> {
1565        let indent_guides = self.editor.update(cx, |editor, cx| {
1566            editor.indent_guides(visible_buffer_range, snapshot, cx)
1567        })?;
1568
1569        let active_indent_guide_indices = self.editor.update(cx, |editor, cx| {
1570            editor
1571                .find_active_indent_guide_indices(&indent_guides, snapshot, cx)
1572                .unwrap_or_default()
1573        });
1574
1575        Some(
1576            indent_guides
1577                .into_iter()
1578                .enumerate()
1579                .filter_map(|(i, indent_guide)| {
1580                    let single_indent_width =
1581                        self.column_pixels(indent_guide.tab_size as usize, cx);
1582                    let total_width = single_indent_width * indent_guide.depth as f32;
1583                    let start_x = content_origin.x + total_width - scroll_pixel_position.x;
1584                    if start_x >= text_origin.x {
1585                        let (offset_y, length) = Self::calculate_indent_guide_bounds(
1586                            indent_guide.multibuffer_row_range.clone(),
1587                            line_height,
1588                            snapshot,
1589                        );
1590
1591                        let start_y = content_origin.y + offset_y - scroll_pixel_position.y;
1592
1593                        Some(IndentGuideLayout {
1594                            origin: point(start_x, start_y),
1595                            length,
1596                            single_indent_width,
1597                            depth: indent_guide.depth,
1598                            active: active_indent_guide_indices.contains(&i),
1599                            settings: indent_guide.settings,
1600                        })
1601                    } else {
1602                        None
1603                    }
1604                })
1605                .collect(),
1606        )
1607    }
1608
1609    fn calculate_indent_guide_bounds(
1610        row_range: Range<MultiBufferRow>,
1611        line_height: Pixels,
1612        snapshot: &DisplaySnapshot,
1613    ) -> (gpui::Pixels, gpui::Pixels) {
1614        let start_point = Point::new(row_range.start.0, 0);
1615        let end_point = Point::new(row_range.end.0, 0);
1616
1617        let row_range = start_point.to_display_point(snapshot).row()
1618            ..end_point.to_display_point(snapshot).row();
1619
1620        let mut prev_line = start_point;
1621        prev_line.row = prev_line.row.saturating_sub(1);
1622        let prev_line = prev_line.to_display_point(snapshot).row();
1623
1624        let mut cons_line = end_point;
1625        cons_line.row += 1;
1626        let cons_line = cons_line.to_display_point(snapshot).row();
1627
1628        let mut offset_y = row_range.start.0 as f32 * line_height;
1629        let mut length = (cons_line.0.saturating_sub(row_range.start.0)) as f32 * line_height;
1630
1631        // If we are at the end of the buffer, ensure that the indent guide extends to the end of the line.
1632        if row_range.end == cons_line {
1633            length += line_height;
1634        }
1635
1636        // If there is a block (e.g. diagnostic) in between the start of the indent guide and the line above,
1637        // we want to extend the indent guide to the start of the block.
1638        let mut block_height = 0;
1639        let mut block_offset = 0;
1640        let mut found_excerpt_header = false;
1641        for (_, block) in snapshot.blocks_in_range(prev_line..row_range.start) {
1642            if matches!(block, Block::ExcerptBoundary { .. }) {
1643                found_excerpt_header = true;
1644                break;
1645            }
1646            block_offset += block.height();
1647            block_height += block.height();
1648        }
1649        if !found_excerpt_header {
1650            offset_y -= block_offset as f32 * line_height;
1651            length += block_height as f32 * line_height;
1652        }
1653
1654        // If there is a block (e.g. diagnostic) at the end of an multibuffer excerpt,
1655        // we want to ensure that the indent guide stops before the excerpt header.
1656        let mut block_height = 0;
1657        let mut found_excerpt_header = false;
1658        for (_, block) in snapshot.blocks_in_range(row_range.end..cons_line) {
1659            if matches!(block, Block::ExcerptBoundary { .. }) {
1660                found_excerpt_header = true;
1661            }
1662            block_height += block.height();
1663        }
1664        if found_excerpt_header {
1665            length -= block_height as f32 * line_height;
1666        }
1667
1668        (offset_y, length)
1669    }
1670
1671    #[allow(clippy::too_many_arguments)]
1672    fn layout_run_indicators(
1673        &self,
1674        line_height: Pixels,
1675        range: Range<DisplayRow>,
1676        scroll_pixel_position: gpui::Point<Pixels>,
1677        gutter_dimensions: &GutterDimensions,
1678        gutter_hitbox: &Hitbox,
1679        rows_with_hunk_bounds: &HashMap<DisplayRow, Bounds<Pixels>>,
1680        snapshot: &EditorSnapshot,
1681        cx: &mut WindowContext,
1682    ) -> Vec<AnyElement> {
1683        self.editor.update(cx, |editor, cx| {
1684            let active_task_indicator_row =
1685                if let Some(crate::CodeContextMenu::CodeActions(CodeActionsMenu {
1686                    deployed_from_indicator,
1687                    actions,
1688                    ..
1689                })) = editor.context_menu.borrow().as_ref()
1690                {
1691                    actions
1692                        .tasks
1693                        .as_ref()
1694                        .map(|tasks| tasks.position.to_display_point(snapshot).row())
1695                        .or(*deployed_from_indicator)
1696                } else {
1697                    None
1698                };
1699
1700            let offset_range_start = snapshot
1701                .display_point_to_anchor(DisplayPoint::new(range.start, 0), Bias::Left)
1702                .to_offset(&snapshot.buffer_snapshot);
1703            let offset_range_end = snapshot
1704                .display_point_to_anchor(DisplayPoint::new(range.end, 0), Bias::Right)
1705                .to_offset(&snapshot.buffer_snapshot);
1706
1707            editor
1708                .tasks
1709                .iter()
1710                .filter_map(|(_, tasks)| {
1711                    if tasks.offset.0 < offset_range_start || tasks.offset.0 >= offset_range_end {
1712                        return None;
1713                    }
1714                    let multibuffer_point = tasks.offset.0.to_point(&snapshot.buffer_snapshot);
1715                    let multibuffer_row = MultiBufferRow(multibuffer_point.row);
1716                    let buffer_folded = snapshot
1717                        .buffer_snapshot
1718                        .buffer_line_for_row(multibuffer_row)
1719                        .map(|(buffer_snapshot, _)| buffer_snapshot.remote_id())
1720                        .map(|buffer_id| editor.buffer_folded(buffer_id, cx))
1721                        .unwrap_or(false);
1722                    if buffer_folded {
1723                        return None;
1724                    }
1725
1726                    if snapshot.is_line_folded(multibuffer_row) {
1727                        // Skip folded indicators, unless it's the starting line of a fold.
1728                        if multibuffer_row
1729                            .0
1730                            .checked_sub(1)
1731                            .map_or(false, |previous_row| {
1732                                snapshot.is_line_folded(MultiBufferRow(previous_row))
1733                            })
1734                        {
1735                            return None;
1736                        }
1737                    }
1738                    let display_row = multibuffer_point.to_display_point(snapshot).row();
1739                    let button = editor.render_run_indicator(
1740                        &self.style,
1741                        Some(display_row) == active_task_indicator_row,
1742                        display_row,
1743                        cx,
1744                    );
1745
1746                    let button = prepaint_gutter_button(
1747                        button,
1748                        display_row,
1749                        line_height,
1750                        gutter_dimensions,
1751                        scroll_pixel_position,
1752                        gutter_hitbox,
1753                        rows_with_hunk_bounds,
1754                        cx,
1755                    );
1756                    Some(button)
1757                })
1758                .collect_vec()
1759        })
1760    }
1761
1762    #[allow(clippy::too_many_arguments)]
1763    fn layout_code_actions_indicator(
1764        &self,
1765        line_height: Pixels,
1766        newest_selection_head: DisplayPoint,
1767        scroll_pixel_position: gpui::Point<Pixels>,
1768        gutter_dimensions: &GutterDimensions,
1769        gutter_hitbox: &Hitbox,
1770        rows_with_hunk_bounds: &HashMap<DisplayRow, Bounds<Pixels>>,
1771        cx: &mut WindowContext,
1772    ) -> Option<AnyElement> {
1773        let mut active = false;
1774        let mut button = None;
1775        let row = newest_selection_head.row();
1776        self.editor.update(cx, |editor, cx| {
1777            if let Some(crate::CodeContextMenu::CodeActions(CodeActionsMenu {
1778                deployed_from_indicator,
1779                ..
1780            })) = editor.context_menu.borrow().as_ref()
1781            {
1782                active = deployed_from_indicator.map_or(true, |indicator_row| indicator_row == row);
1783            };
1784            button = editor.render_code_actions_indicator(&self.style, row, active, cx);
1785        });
1786
1787        let button = prepaint_gutter_button(
1788            button?,
1789            row,
1790            line_height,
1791            gutter_dimensions,
1792            scroll_pixel_position,
1793            gutter_hitbox,
1794            rows_with_hunk_bounds,
1795            cx,
1796        );
1797
1798        Some(button)
1799    }
1800
1801    fn get_participant_color(
1802        participant_index: Option<ParticipantIndex>,
1803        cx: &WindowContext,
1804    ) -> PlayerColor {
1805        if let Some(index) = participant_index {
1806            cx.theme().players().color_for_participant(index.0)
1807        } else {
1808            cx.theme().players().absent()
1809        }
1810    }
1811
1812    fn calculate_relative_line_numbers(
1813        &self,
1814        snapshot: &EditorSnapshot,
1815        rows: &Range<DisplayRow>,
1816        relative_to: Option<DisplayRow>,
1817    ) -> HashMap<DisplayRow, DisplayRowDelta> {
1818        let mut relative_rows: HashMap<DisplayRow, DisplayRowDelta> = Default::default();
1819        let Some(relative_to) = relative_to else {
1820            return relative_rows;
1821        };
1822
1823        let start = rows.start.min(relative_to);
1824        let end = rows.end.max(relative_to);
1825
1826        let buffer_rows = snapshot
1827            .buffer_rows(start)
1828            .take(1 + end.minus(start) as usize)
1829            .collect::<Vec<_>>();
1830
1831        let head_idx = relative_to.minus(start);
1832        let mut delta = 1;
1833        let mut i = head_idx + 1;
1834        while i < buffer_rows.len() as u32 {
1835            if buffer_rows[i as usize].is_some() {
1836                if rows.contains(&DisplayRow(i + start.0)) {
1837                    relative_rows.insert(DisplayRow(i + start.0), delta);
1838                }
1839                delta += 1;
1840            }
1841            i += 1;
1842        }
1843        delta = 1;
1844        i = head_idx.min(buffer_rows.len() as u32 - 1);
1845        while i > 0 && buffer_rows[i as usize].is_none() {
1846            i -= 1;
1847        }
1848
1849        while i > 0 {
1850            i -= 1;
1851            if buffer_rows[i as usize].is_some() {
1852                if rows.contains(&DisplayRow(i + start.0)) {
1853                    relative_rows.insert(DisplayRow(i + start.0), delta);
1854                }
1855                delta += 1;
1856            }
1857        }
1858
1859        relative_rows
1860    }
1861
1862    fn layout_line_numbers(
1863        &self,
1864        rows: Range<DisplayRow>,
1865        buffer_rows: impl Iterator<Item = Option<MultiBufferRow>>,
1866        active_rows: &BTreeMap<DisplayRow, bool>,
1867        newest_selection_head: Option<DisplayPoint>,
1868        snapshot: &EditorSnapshot,
1869        cx: &mut WindowContext,
1870    ) -> Vec<Option<ShapedLine>> {
1871        let include_line_numbers = snapshot.show_line_numbers.unwrap_or_else(|| {
1872            EditorSettings::get_global(cx).gutter.line_numbers && snapshot.mode == EditorMode::Full
1873        });
1874        if !include_line_numbers {
1875            return Vec::new();
1876        }
1877
1878        let (newest_selection_head, is_relative) = self.editor.update(cx, |editor, cx| {
1879            let newest_selection_head = newest_selection_head.unwrap_or_else(|| {
1880                let newest = editor.selections.newest::<Point>(cx);
1881                SelectionLayout::new(
1882                    newest,
1883                    editor.selections.line_mode,
1884                    editor.cursor_shape,
1885                    &snapshot.display_snapshot,
1886                    true,
1887                    true,
1888                    None,
1889                )
1890                .head
1891            });
1892            let is_relative = editor.should_use_relative_line_numbers(cx);
1893            (newest_selection_head, is_relative)
1894        });
1895        let font_size = self.style.text.font_size.to_pixels(cx.rem_size());
1896
1897        let relative_to = if is_relative {
1898            Some(newest_selection_head.row())
1899        } else {
1900            None
1901        };
1902        let relative_rows = self.calculate_relative_line_numbers(snapshot, &rows, relative_to);
1903        let mut line_number = String::new();
1904        buffer_rows
1905            .into_iter()
1906            .enumerate()
1907            .map(|(ix, multibuffer_row)| {
1908                let multibuffer_row = multibuffer_row?;
1909                let display_row = DisplayRow(rows.start.0 + ix as u32);
1910                let color = if active_rows.contains_key(&display_row) {
1911                    cx.theme().colors().editor_active_line_number
1912                } else {
1913                    cx.theme().colors().editor_line_number
1914                };
1915                line_number.clear();
1916                let default_number = multibuffer_row.0 + 1;
1917                let number = relative_rows
1918                    .get(&DisplayRow(ix as u32 + rows.start.0))
1919                    .unwrap_or(&default_number);
1920                write!(&mut line_number, "{number}").unwrap();
1921                let run = TextRun {
1922                    len: line_number.len(),
1923                    font: self.style.text.font(),
1924                    color,
1925                    background_color: None,
1926                    underline: None,
1927                    strikethrough: None,
1928                };
1929                let shaped_line = cx
1930                    .text_system()
1931                    .shape_line(line_number.clone().into(), font_size, &[run])
1932                    .unwrap();
1933                Some(shaped_line)
1934            })
1935            .collect()
1936    }
1937
1938    fn layout_crease_toggles(
1939        &self,
1940        rows: Range<DisplayRow>,
1941        buffer_rows: impl IntoIterator<Item = Option<MultiBufferRow>>,
1942        active_rows: &BTreeMap<DisplayRow, bool>,
1943        snapshot: &EditorSnapshot,
1944        cx: &mut WindowContext,
1945    ) -> Vec<Option<AnyElement>> {
1946        let include_fold_statuses = EditorSettings::get_global(cx).gutter.folds
1947            && snapshot.mode == EditorMode::Full
1948            && self.editor.read(cx).is_singleton(cx);
1949        if include_fold_statuses {
1950            buffer_rows
1951                .into_iter()
1952                .enumerate()
1953                .map(|(ix, row)| {
1954                    if let Some(multibuffer_row) = row {
1955                        let display_row = DisplayRow(rows.start.0 + ix as u32);
1956                        let active = active_rows.contains_key(&display_row);
1957                        snapshot.render_crease_toggle(
1958                            multibuffer_row,
1959                            active,
1960                            self.editor.clone(),
1961                            cx,
1962                        )
1963                    } else {
1964                        None
1965                    }
1966                })
1967                .collect()
1968        } else {
1969            Vec::new()
1970        }
1971    }
1972
1973    fn layout_crease_trailers(
1974        &self,
1975        buffer_rows: impl IntoIterator<Item = Option<MultiBufferRow>>,
1976        snapshot: &EditorSnapshot,
1977        cx: &mut WindowContext,
1978    ) -> Vec<Option<AnyElement>> {
1979        buffer_rows
1980            .into_iter()
1981            .map(|row| {
1982                if let Some(multibuffer_row) = row {
1983                    snapshot.render_crease_trailer(multibuffer_row, cx)
1984                } else {
1985                    None
1986                }
1987            })
1988            .collect()
1989    }
1990
1991    fn layout_lines(
1992        rows: Range<DisplayRow>,
1993        snapshot: &EditorSnapshot,
1994        style: &EditorStyle,
1995        editor_width: Pixels,
1996        is_row_soft_wrapped: impl Copy + Fn(usize) -> bool,
1997        cx: &mut WindowContext,
1998    ) -> Vec<LineWithInvisibles> {
1999        if rows.start >= rows.end {
2000            return Vec::new();
2001        }
2002
2003        // Show the placeholder when the editor is empty
2004        if snapshot.is_empty() {
2005            let font_size = style.text.font_size.to_pixels(cx.rem_size());
2006            let placeholder_color = cx.theme().colors().text_placeholder;
2007            let placeholder_text = snapshot.placeholder_text();
2008
2009            let placeholder_lines = placeholder_text
2010                .as_ref()
2011                .map_or("", AsRef::as_ref)
2012                .split('\n')
2013                .skip(rows.start.0 as usize)
2014                .chain(iter::repeat(""))
2015                .take(rows.len());
2016            placeholder_lines
2017                .filter_map(move |line| {
2018                    let run = TextRun {
2019                        len: line.len(),
2020                        font: style.text.font(),
2021                        color: placeholder_color,
2022                        background_color: None,
2023                        underline: Default::default(),
2024                        strikethrough: None,
2025                    };
2026                    cx.text_system()
2027                        .shape_line(line.to_string().into(), font_size, &[run])
2028                        .log_err()
2029                })
2030                .map(|line| LineWithInvisibles {
2031                    width: line.width,
2032                    len: line.len,
2033                    fragments: smallvec![LineFragment::Text(line)],
2034                    invisibles: Vec::new(),
2035                    font_size,
2036                })
2037                .collect()
2038        } else {
2039            let chunks = snapshot.highlighted_chunks(rows.clone(), true, style);
2040            LineWithInvisibles::from_chunks(
2041                chunks,
2042                &style,
2043                MAX_LINE_LEN,
2044                rows.len(),
2045                snapshot.mode,
2046                editor_width,
2047                is_row_soft_wrapped,
2048                cx,
2049            )
2050        }
2051    }
2052
2053    fn prepaint_lines(
2054        &self,
2055        start_row: DisplayRow,
2056        line_layouts: &mut [LineWithInvisibles],
2057        line_height: Pixels,
2058        scroll_pixel_position: gpui::Point<Pixels>,
2059        content_origin: gpui::Point<Pixels>,
2060        cx: &mut WindowContext,
2061    ) -> SmallVec<[AnyElement; 1]> {
2062        let mut line_elements = SmallVec::new();
2063        for (ix, line) in line_layouts.iter_mut().enumerate() {
2064            let row = start_row + DisplayRow(ix as u32);
2065            line.prepaint(
2066                line_height,
2067                scroll_pixel_position,
2068                row,
2069                content_origin,
2070                &mut line_elements,
2071                cx,
2072            );
2073        }
2074        line_elements
2075    }
2076
2077    #[allow(clippy::too_many_arguments)]
2078    fn render_block(
2079        &self,
2080        block: &Block,
2081        available_width: AvailableSpace,
2082        block_id: BlockId,
2083        block_row_start: DisplayRow,
2084        snapshot: &EditorSnapshot,
2085        text_x: Pixels,
2086        rows: &Range<DisplayRow>,
2087        line_layouts: &[LineWithInvisibles],
2088        gutter_dimensions: &GutterDimensions,
2089        line_height: Pixels,
2090        em_width: Pixels,
2091        text_hitbox: &Hitbox,
2092        editor_width: Pixels,
2093        scroll_width: &mut Pixels,
2094        resized_blocks: &mut HashMap<CustomBlockId, u32>,
2095        selections: &[Selection<Point>],
2096        is_row_soft_wrapped: impl Copy + Fn(usize) -> bool,
2097        cx: &mut WindowContext,
2098    ) -> (AnyElement, Size<Pixels>) {
2099        let header_padding = px(6.0);
2100        let mut element = match block {
2101            Block::Custom(block) => {
2102                let block_start = block.start().to_point(&snapshot.buffer_snapshot);
2103                let block_end = block.end().to_point(&snapshot.buffer_snapshot);
2104                let align_to = block_start.to_display_point(snapshot);
2105                let anchor_x = text_x
2106                    + if rows.contains(&align_to.row()) {
2107                        line_layouts[align_to.row().minus(rows.start) as usize]
2108                            .x_for_index(align_to.column() as usize)
2109                    } else {
2110                        layout_line(
2111                            align_to.row(),
2112                            snapshot,
2113                            &self.style,
2114                            editor_width,
2115                            is_row_soft_wrapped,
2116                            cx,
2117                        )
2118                        .x_for_index(align_to.column() as usize)
2119                    };
2120
2121                let selected = selections
2122                    .binary_search_by(|selection| {
2123                        if selection.end <= block_start {
2124                            Ordering::Less
2125                        } else if selection.start >= block_end {
2126                            Ordering::Greater
2127                        } else {
2128                            Ordering::Equal
2129                        }
2130                    })
2131                    .is_ok();
2132
2133                div()
2134                    .size_full()
2135                    .child(block.render(&mut BlockContext {
2136                        context: cx,
2137                        anchor_x,
2138                        gutter_dimensions,
2139                        line_height,
2140                        em_width,
2141                        block_id,
2142                        selected,
2143                        max_width: text_hitbox.size.width.max(*scroll_width),
2144                        editor_style: &self.style,
2145                    }))
2146                    .into_any()
2147            }
2148
2149            Block::FoldedBuffer {
2150                first_excerpt,
2151                prev_excerpt,
2152                show_excerpt_controls,
2153                height,
2154                ..
2155            } => {
2156                let icon_offset = gutter_dimensions.width
2157                    - (gutter_dimensions.left_padding + gutter_dimensions.margin);
2158
2159                let mut result = v_flex().id(block_id).w_full();
2160                if let Some(prev_excerpt) = prev_excerpt {
2161                    if *show_excerpt_controls {
2162                        result = result.child(
2163                            h_flex()
2164                                .w(icon_offset)
2165                                .h(MULTI_BUFFER_EXCERPT_HEADER_HEIGHT as f32 * cx.line_height())
2166                                .flex_none()
2167                                .justify_end()
2168                                .child(self.render_expand_excerpt_button(
2169                                    prev_excerpt.id,
2170                                    ExpandExcerptDirection::Down,
2171                                    IconName::ArrowDownFromLine,
2172                                    cx,
2173                                )),
2174                        );
2175                    }
2176                }
2177
2178                let jump_data = jump_data(snapshot, block_row_start, *height, first_excerpt, cx);
2179                result
2180                    .child(self.render_buffer_header(
2181                        first_excerpt,
2182                        header_padding,
2183                        true,
2184                        jump_data,
2185                        cx,
2186                    ))
2187                    .into_any_element()
2188            }
2189            Block::ExcerptBoundary {
2190                prev_excerpt,
2191                next_excerpt,
2192                show_excerpt_controls,
2193                height,
2194                starts_new_buffer,
2195                ..
2196            } => {
2197                let icon_offset = gutter_dimensions.width
2198                    - (gutter_dimensions.left_padding + gutter_dimensions.margin);
2199
2200                let mut result = v_flex().id(block_id).w_full();
2201                if let Some(prev_excerpt) = prev_excerpt {
2202                    if *show_excerpt_controls {
2203                        result = result.child(
2204                            h_flex()
2205                                .w(icon_offset)
2206                                .h(MULTI_BUFFER_EXCERPT_HEADER_HEIGHT as f32 * cx.line_height())
2207                                .flex_none()
2208                                .justify_end()
2209                                .child(self.render_expand_excerpt_button(
2210                                    prev_excerpt.id,
2211                                    ExpandExcerptDirection::Down,
2212                                    IconName::ArrowDownFromLine,
2213                                    cx,
2214                                )),
2215                        );
2216                    }
2217                }
2218
2219                if let Some(next_excerpt) = next_excerpt {
2220                    let jump_data = jump_data(snapshot, block_row_start, *height, next_excerpt, cx);
2221                    if *starts_new_buffer {
2222                        result = result.child(self.render_buffer_header(
2223                            next_excerpt,
2224                            header_padding,
2225                            false,
2226                            jump_data,
2227                            cx,
2228                        ));
2229                        if *show_excerpt_controls {
2230                            result = result.child(
2231                                h_flex()
2232                                    .w(icon_offset)
2233                                    .h(MULTI_BUFFER_EXCERPT_HEADER_HEIGHT as f32 * cx.line_height())
2234                                    .flex_none()
2235                                    .justify_end()
2236                                    .child(self.render_expand_excerpt_button(
2237                                        next_excerpt.id,
2238                                        ExpandExcerptDirection::Up,
2239                                        IconName::ArrowUpFromLine,
2240                                        cx,
2241                                    )),
2242                            );
2243                        }
2244                    } else {
2245                        let editor = self.editor.clone();
2246                        result = result.child(
2247                            h_flex()
2248                                .id("excerpt header block")
2249                                .group("excerpt-jump-action")
2250                                .justify_start()
2251                                .w_full()
2252                                .h(MULTI_BUFFER_EXCERPT_HEADER_HEIGHT as f32 * cx.line_height())
2253                                .relative()
2254                                .child(
2255                                    div()
2256                                        .top(px(0.))
2257                                        .absolute()
2258                                        .w_full()
2259                                        .h_px()
2260                                        .bg(cx.theme().colors().border_variant)
2261                                        .group_hover("excerpt-jump-action", |style| {
2262                                            style.bg(cx.theme().colors().border)
2263                                        }),
2264                                )
2265                                .cursor_pointer()
2266                                .on_click({
2267                                    let jump_data = jump_data.clone();
2268                                    cx.listener_for(&self.editor, {
2269                                        let jump_data = jump_data.clone();
2270                                        move |editor, e: &ClickEvent, cx| {
2271                                            cx.stop_propagation();
2272                                            editor.open_excerpts_common(
2273                                                Some(jump_data.clone()),
2274                                                e.down.modifiers.secondary(),
2275                                                cx,
2276                                            );
2277                                        }
2278                                    })
2279                                })
2280                                .tooltip({
2281                                    let jump_data = jump_data.clone();
2282                                    move |cx| {
2283                                        let jump_message = format!(
2284                                            "Jump to {}:L{}",
2285                                            match &jump_data.path {
2286                                                Some(project_path) =>
2287                                                    project_path.path.display().to_string(),
2288                                                None => {
2289                                                    let editor = editor.read(cx);
2290                                                    editor
2291                                                        .file_at(jump_data.position, cx)
2292                                                        .map(|file| {
2293                                                            file.full_path(cx).display().to_string()
2294                                                        })
2295                                                        .or_else(|| {
2296                                                            Some(
2297                                                                editor
2298                                                                    .tab_description(0, cx)?
2299                                                                    .to_string(),
2300                                                            )
2301                                                        })
2302                                                        .unwrap_or_else(|| {
2303                                                            "Unknown buffer".to_string()
2304                                                        })
2305                                                }
2306                                            },
2307                                            jump_data.position.row + 1
2308                                        );
2309                                        Tooltip::for_action(jump_message, &OpenExcerpts, cx)
2310                                    }
2311                                })
2312                                .child(
2313                                    h_flex()
2314                                        .w(icon_offset)
2315                                        .h(MULTI_BUFFER_EXCERPT_HEADER_HEIGHT as f32
2316                                            * cx.line_height())
2317                                        .flex_none()
2318                                        .justify_end()
2319                                        .child(if *show_excerpt_controls {
2320                                            self.render_expand_excerpt_button(
2321                                                next_excerpt.id,
2322                                                ExpandExcerptDirection::Up,
2323                                                IconName::ArrowUpFromLine,
2324                                                cx,
2325                                            )
2326                                        } else {
2327                                            ButtonLike::new("jump-icon")
2328                                                .style(ButtonStyle::Transparent)
2329                                                .child(
2330                                                    svg()
2331                                                        .path(IconName::ArrowUpRight.path())
2332                                                        .size(IconSize::XSmall.rems())
2333                                                        .text_color(
2334                                                            cx.theme().colors().border_variant,
2335                                                        )
2336                                                        .group_hover(
2337                                                            "excerpt-jump-action",
2338                                                            |style| {
2339                                                                style.text_color(
2340                                                                    cx.theme().colors().border,
2341                                                                )
2342                                                            },
2343                                                        ),
2344                                                )
2345                                        }),
2346                                ),
2347                        );
2348                    }
2349                }
2350
2351                result.into_any()
2352            }
2353        };
2354
2355        // Discover the element's content height, then round up to the nearest multiple of line height.
2356        let preliminary_size =
2357            element.layout_as_root(size(available_width, AvailableSpace::MinContent), cx);
2358        let quantized_height = (preliminary_size.height / line_height).ceil() * line_height;
2359        let final_size = if preliminary_size.height == quantized_height {
2360            preliminary_size
2361        } else {
2362            element.layout_as_root(size(available_width, quantized_height.into()), cx)
2363        };
2364
2365        if let BlockId::Custom(custom_block_id) = block_id {
2366            if block.height() > 0 {
2367                let element_height_in_lines =
2368                    ((final_size.height / line_height).ceil() as u32).max(1);
2369                if element_height_in_lines != block.height() {
2370                    resized_blocks.insert(custom_block_id, element_height_in_lines);
2371                }
2372            }
2373        }
2374
2375        (element, final_size)
2376    }
2377
2378    fn render_buffer_header(
2379        &self,
2380        for_excerpt: &ExcerptInfo,
2381        header_padding: Pixels,
2382        is_folded: bool,
2383        jump_data: JumpData,
2384        cx: &mut WindowContext,
2385    ) -> Div {
2386        let include_root = self
2387            .editor
2388            .read(cx)
2389            .project
2390            .as_ref()
2391            .map(|project| project.read(cx).visible_worktrees(cx).count() > 1)
2392            .unwrap_or_default();
2393        let path = for_excerpt.buffer.resolve_file_path(cx, include_root);
2394        let filename = path
2395            .as_ref()
2396            .and_then(|path| Some(path.file_name()?.to_string_lossy().to_string()));
2397        let parent_path = path
2398            .as_ref()
2399            .and_then(|path| Some(path.parent()?.to_string_lossy().to_string() + "/"));
2400
2401        div()
2402            .px(header_padding)
2403            .pt(header_padding)
2404            .w_full()
2405            .h(FILE_HEADER_HEIGHT as f32 * cx.line_height())
2406            .child(
2407                h_flex()
2408                    .id("path header block")
2409                    .size_full()
2410                    .flex_basis(Length::Definite(DefiniteLength::Fraction(0.667)))
2411                    .px(gpui::px(12.))
2412                    .rounded_md()
2413                    .shadow_md()
2414                    .border_1()
2415                    .border_color(cx.theme().colors().border)
2416                    .bg(cx.theme().colors().editor_subheader_background)
2417                    .justify_between()
2418                    .hover(|style| style.bg(cx.theme().colors().element_hover))
2419                    .child(
2420                        h_flex()
2421                            .gap_3()
2422                            .map(|header| {
2423                                let editor = self.editor.clone();
2424                                let buffer_id = for_excerpt.buffer_id;
2425                                let toggle_chevron_icon =
2426                                    FileIcons::get_chevron_icon(!is_folded, cx)
2427                                        .map(Icon::from_path);
2428                                header.child(
2429                                    ButtonLike::new("toggle-buffer-fold")
2430                                        .children(toggle_chevron_icon)
2431                                        .on_click(move |_, cx| {
2432                                            if is_folded {
2433                                                editor.update(cx, |editor, cx| {
2434                                                    editor.unfold_buffer(buffer_id, cx);
2435                                                });
2436                                            } else {
2437                                                editor.update(cx, |editor, cx| {
2438                                                    editor.fold_buffer(buffer_id, cx);
2439                                                });
2440                                            }
2441                                        }),
2442                                )
2443                            })
2444                            .child(
2445                                h_flex()
2446                                    .gap_2()
2447                                    .child(
2448                                        filename
2449                                            .map(SharedString::from)
2450                                            .unwrap_or_else(|| "untitled".into()),
2451                                    )
2452                                    .when_some(parent_path, |then, path| {
2453                                        then.child(
2454                                            div()
2455                                                .child(path)
2456                                                .text_color(cx.theme().colors().text_muted),
2457                                        )
2458                                    }),
2459                            ),
2460                    )
2461                    .child(Icon::new(IconName::ArrowUpRight))
2462                    .cursor_pointer()
2463                    .tooltip(|cx| Tooltip::for_action("Jump to File", &OpenExcerpts, cx))
2464                    .on_mouse_down(MouseButton::Left, |_, cx| cx.stop_propagation())
2465                    .on_click(cx.listener_for(&self.editor, {
2466                        move |editor, e: &ClickEvent, cx| {
2467                            editor.open_excerpts_common(
2468                                Some(jump_data.clone()),
2469                                e.down.modifiers.secondary(),
2470                                cx,
2471                            );
2472                        }
2473                    })),
2474            )
2475    }
2476
2477    fn render_expand_excerpt_button(
2478        &self,
2479        excerpt_id: ExcerptId,
2480        direction: ExpandExcerptDirection,
2481        icon: IconName,
2482        cx: &mut WindowContext,
2483    ) -> ButtonLike {
2484        ButtonLike::new("expand-icon")
2485            .style(ButtonStyle::Transparent)
2486            .child(
2487                svg()
2488                    .path(icon.path())
2489                    .size(IconSize::XSmall.rems())
2490                    .text_color(cx.theme().colors().editor_line_number)
2491                    .group("")
2492                    .hover(|style| style.text_color(cx.theme().colors().editor_active_line_number)),
2493            )
2494            .on_click(cx.listener_for(&self.editor, {
2495                move |editor, _, cx| {
2496                    editor.expand_excerpt(excerpt_id, direction, cx);
2497                }
2498            }))
2499            .tooltip({
2500                move |cx| Tooltip::for_action("Expand Excerpt", &ExpandExcerpts { lines: 0 }, cx)
2501            })
2502    }
2503
2504    #[allow(clippy::too_many_arguments)]
2505    fn render_blocks(
2506        &self,
2507        rows: Range<DisplayRow>,
2508        snapshot: &EditorSnapshot,
2509        hitbox: &Hitbox,
2510        text_hitbox: &Hitbox,
2511        editor_width: Pixels,
2512        scroll_width: &mut Pixels,
2513        gutter_dimensions: &GutterDimensions,
2514        em_width: Pixels,
2515        text_x: Pixels,
2516        line_height: Pixels,
2517        line_layouts: &[LineWithInvisibles],
2518        selections: &[Selection<Point>],
2519        is_row_soft_wrapped: impl Copy + Fn(usize) -> bool,
2520        cx: &mut WindowContext,
2521    ) -> Result<Vec<BlockLayout>, HashMap<CustomBlockId, u32>> {
2522        let (fixed_blocks, non_fixed_blocks) = snapshot
2523            .blocks_in_range(rows.clone())
2524            .partition::<Vec<_>, _>(|(_, block)| block.style() == BlockStyle::Fixed);
2525
2526        let mut focused_block = self
2527            .editor
2528            .update(cx, |editor, _| editor.take_focused_block());
2529        let mut fixed_block_max_width = Pixels::ZERO;
2530        let mut blocks = Vec::new();
2531        let mut resized_blocks = HashMap::default();
2532
2533        for (row, block) in fixed_blocks {
2534            let block_id = block.id();
2535
2536            if focused_block.as_ref().map_or(false, |b| b.id == block_id) {
2537                focused_block = None;
2538            }
2539
2540            let (element, element_size) = self.render_block(
2541                block,
2542                AvailableSpace::MinContent,
2543                block_id,
2544                row,
2545                snapshot,
2546                text_x,
2547                &rows,
2548                line_layouts,
2549                gutter_dimensions,
2550                line_height,
2551                em_width,
2552                text_hitbox,
2553                editor_width,
2554                scroll_width,
2555                &mut resized_blocks,
2556                selections,
2557                is_row_soft_wrapped,
2558                cx,
2559            );
2560            fixed_block_max_width = fixed_block_max_width.max(element_size.width + em_width);
2561            blocks.push(BlockLayout {
2562                id: block_id,
2563                row: Some(row),
2564                element,
2565                available_space: size(AvailableSpace::MinContent, element_size.height.into()),
2566                style: BlockStyle::Fixed,
2567            });
2568        }
2569        for (row, block) in non_fixed_blocks {
2570            let style = block.style();
2571            let width = match style {
2572                BlockStyle::Sticky => hitbox.size.width,
2573                BlockStyle::Flex => hitbox
2574                    .size
2575                    .width
2576                    .max(fixed_block_max_width)
2577                    .max(gutter_dimensions.width + *scroll_width),
2578                BlockStyle::Fixed => unreachable!(),
2579            };
2580            let block_id = block.id();
2581
2582            if focused_block.as_ref().map_or(false, |b| b.id == block_id) {
2583                focused_block = None;
2584            }
2585
2586            let (element, element_size) = self.render_block(
2587                block,
2588                width.into(),
2589                block_id,
2590                row,
2591                snapshot,
2592                text_x,
2593                &rows,
2594                line_layouts,
2595                gutter_dimensions,
2596                line_height,
2597                em_width,
2598                text_hitbox,
2599                editor_width,
2600                scroll_width,
2601                &mut resized_blocks,
2602                selections,
2603                is_row_soft_wrapped,
2604                cx,
2605            );
2606
2607            blocks.push(BlockLayout {
2608                id: block_id,
2609                row: Some(row),
2610                element,
2611                available_space: size(width.into(), element_size.height.into()),
2612                style,
2613            });
2614        }
2615
2616        if let Some(focused_block) = focused_block {
2617            if let Some(focus_handle) = focused_block.focus_handle.upgrade() {
2618                if focus_handle.is_focused(cx) {
2619                    if let Some(block) = snapshot.block_for_id(focused_block.id) {
2620                        let style = block.style();
2621                        let width = match style {
2622                            BlockStyle::Fixed => AvailableSpace::MinContent,
2623                            BlockStyle::Flex => AvailableSpace::Definite(
2624                                hitbox
2625                                    .size
2626                                    .width
2627                                    .max(fixed_block_max_width)
2628                                    .max(gutter_dimensions.width + *scroll_width),
2629                            ),
2630                            BlockStyle::Sticky => AvailableSpace::Definite(hitbox.size.width),
2631                        };
2632
2633                        let (element, element_size) = self.render_block(
2634                            &block,
2635                            width,
2636                            focused_block.id,
2637                            rows.end,
2638                            snapshot,
2639                            text_x,
2640                            &rows,
2641                            line_layouts,
2642                            gutter_dimensions,
2643                            line_height,
2644                            em_width,
2645                            text_hitbox,
2646                            editor_width,
2647                            scroll_width,
2648                            &mut resized_blocks,
2649                            selections,
2650                            is_row_soft_wrapped,
2651                            cx,
2652                        );
2653
2654                        blocks.push(BlockLayout {
2655                            id: block.id(),
2656                            row: None,
2657                            element,
2658                            available_space: size(width, element_size.height.into()),
2659                            style,
2660                        });
2661                    }
2662                }
2663            }
2664        }
2665
2666        if resized_blocks.is_empty() {
2667            *scroll_width = (*scroll_width).max(fixed_block_max_width - gutter_dimensions.width);
2668            Ok(blocks)
2669        } else {
2670            Err(resized_blocks)
2671        }
2672    }
2673
2674    /// Returns true if any of the blocks changed size since the previous frame. This will trigger
2675    /// a restart of rendering for the editor based on the new sizes.
2676    fn layout_blocks(
2677        &self,
2678        blocks: &mut Vec<BlockLayout>,
2679        block_starts: &mut HashSet<DisplayRow>,
2680        hitbox: &Hitbox,
2681        line_height: Pixels,
2682        scroll_pixel_position: gpui::Point<Pixels>,
2683        cx: &mut WindowContext,
2684    ) {
2685        for block in blocks {
2686            let mut origin = if let Some(row) = block.row {
2687                block_starts.insert(row);
2688                hitbox.origin
2689                    + point(
2690                        Pixels::ZERO,
2691                        row.as_f32() * line_height - scroll_pixel_position.y,
2692                    )
2693            } else {
2694                // Position the block outside the visible area
2695                hitbox.origin + point(Pixels::ZERO, hitbox.size.height)
2696            };
2697
2698            if !matches!(block.style, BlockStyle::Sticky) {
2699                origin += point(-scroll_pixel_position.x, Pixels::ZERO);
2700            }
2701
2702            let focus_handle = block
2703                .element
2704                .prepaint_as_root(origin, block.available_space, cx);
2705
2706            if let Some(focus_handle) = focus_handle {
2707                self.editor.update(cx, |editor, _cx| {
2708                    editor.set_focused_block(FocusedBlock {
2709                        id: block.id,
2710                        focus_handle: focus_handle.downgrade(),
2711                    });
2712                });
2713            }
2714        }
2715    }
2716
2717    #[allow(clippy::too_many_arguments)]
2718    fn layout_context_menu(
2719        &self,
2720        line_height: Pixels,
2721        hitbox: &Hitbox,
2722        text_hitbox: &Hitbox,
2723        content_origin: gpui::Point<Pixels>,
2724        start_row: DisplayRow,
2725        scroll_pixel_position: gpui::Point<Pixels>,
2726        line_layouts: &[LineWithInvisibles],
2727        newest_selection_head: DisplayPoint,
2728        gutter_overshoot: Pixels,
2729        cx: &mut WindowContext,
2730    ) -> bool {
2731        let max_height = cmp::min(
2732            12. * line_height,
2733            cmp::max(3. * line_height, (hitbox.size.height - line_height) / 2.),
2734        );
2735        let Some((position, mut context_menu)) = self.editor.update(cx, |editor, cx| {
2736            if editor.context_menu_visible() {
2737                editor.render_context_menu(newest_selection_head, &self.style, max_height, cx)
2738            } else {
2739                None
2740            }
2741        }) else {
2742            return false;
2743        };
2744
2745        let context_menu_size = context_menu.layout_as_root(AvailableSpace::min_size(), cx);
2746
2747        let (x, y) = match position {
2748            crate::ContextMenuOrigin::EditorPoint(point) => {
2749                let cursor_row_layout = &line_layouts[point.row().minus(start_row) as usize];
2750                let x = cursor_row_layout.x_for_index(point.column() as usize)
2751                    - scroll_pixel_position.x;
2752                let y = point.row().next_row().as_f32() * line_height - scroll_pixel_position.y;
2753                (x, y)
2754            }
2755            crate::ContextMenuOrigin::GutterIndicator(row) => {
2756                // Context menu was spawned via a click on a gutter. Ensure it's a bit closer to the indicator than just a plain first column of the
2757                // text field.
2758                let x = -gutter_overshoot;
2759                let y = row.next_row().as_f32() * line_height - scroll_pixel_position.y;
2760                (x, y)
2761            }
2762        };
2763
2764        let mut list_origin = content_origin + point(x, y);
2765        let list_width = context_menu_size.width;
2766        let list_height = context_menu_size.height;
2767
2768        // Snap the right edge of the list to the right edge of the window if
2769        // its horizontal bounds overflow.
2770        if list_origin.x + list_width > cx.viewport_size().width {
2771            list_origin.x = (cx.viewport_size().width - list_width).max(Pixels::ZERO);
2772        }
2773
2774        if list_origin.y + list_height > text_hitbox.lower_right().y {
2775            list_origin.y -= line_height + list_height;
2776        }
2777
2778        cx.defer_draw(context_menu, list_origin, 1);
2779        true
2780    }
2781
2782    #[allow(clippy::too_many_arguments)]
2783    fn layout_inline_completion_popover(
2784        &self,
2785        text_bounds: &Bounds<Pixels>,
2786        editor_snapshot: &EditorSnapshot,
2787        visible_row_range: Range<DisplayRow>,
2788        scroll_top: f32,
2789        scroll_bottom: f32,
2790        line_layouts: &[LineWithInvisibles],
2791        line_height: Pixels,
2792        scroll_pixel_position: gpui::Point<Pixels>,
2793        editor_width: Pixels,
2794        style: &EditorStyle,
2795        cx: &mut WindowContext,
2796    ) -> Option<AnyElement> {
2797        const PADDING_X: Pixels = Pixels(24.);
2798        const PADDING_Y: Pixels = Pixels(2.);
2799
2800        let active_inline_completion = self.editor.read(cx).active_inline_completion.as_ref()?;
2801
2802        match &active_inline_completion.completion {
2803            InlineCompletion::Move(target_position) => {
2804                let tab_kbd = h_flex()
2805                    .px_0p5()
2806                    .font(theme::ThemeSettings::get_global(cx).buffer_font.clone())
2807                    .text_size(TextSize::XSmall.rems(cx))
2808                    .text_color(cx.theme().colors().text.opacity(0.8))
2809                    .child("tab");
2810
2811                let icon_container = div().mt(px(2.5)); // For optical alignment
2812
2813                let container_element = h_flex()
2814                    .items_center()
2815                    .py_0p5()
2816                    .px_1()
2817                    .gap_1()
2818                    .bg(cx.theme().colors().editor_subheader_background)
2819                    .border_1()
2820                    .border_color(cx.theme().colors().text_accent.opacity(0.2))
2821                    .rounded_md()
2822                    .shadow_sm();
2823
2824                let target_display_point = target_position.to_display_point(editor_snapshot);
2825                if target_display_point.row().as_f32() < scroll_top {
2826                    let mut element = container_element
2827                        .child(tab_kbd)
2828                        .child(Label::new("Jump to Edit").size(LabelSize::Small))
2829                        .child(
2830                            icon_container
2831                                .child(Icon::new(IconName::ArrowUp).size(IconSize::Small)),
2832                        )
2833                        .into_any();
2834                    let size = element.layout_as_root(AvailableSpace::min_size(), cx);
2835                    let offset = point((text_bounds.size.width - size.width) / 2., PADDING_Y);
2836                    element.prepaint_at(text_bounds.origin + offset, cx);
2837                    Some(element)
2838                } else if (target_display_point.row().as_f32() + 1.) > scroll_bottom {
2839                    let mut element = container_element
2840                        .child(tab_kbd)
2841                        .child(Label::new("Jump to Edit").size(LabelSize::Small))
2842                        .child(
2843                            icon_container
2844                                .child(Icon::new(IconName::ArrowDown).size(IconSize::Small)),
2845                        )
2846                        .into_any();
2847                    let size = element.layout_as_root(AvailableSpace::min_size(), cx);
2848                    let offset = point(
2849                        (text_bounds.size.width - size.width) / 2.,
2850                        text_bounds.size.height - size.height - PADDING_Y,
2851                    );
2852                    element.prepaint_at(text_bounds.origin + offset, cx);
2853                    Some(element)
2854                } else {
2855                    let mut element = container_element
2856                        .child(tab_kbd)
2857                        .child(Label::new("Jump to Edit").size(LabelSize::Small))
2858                        .into_any();
2859
2860                    let target_line_end = DisplayPoint::new(
2861                        target_display_point.row(),
2862                        editor_snapshot.line_len(target_display_point.row()),
2863                    );
2864                    let origin = self.editor.update(cx, |editor, cx| {
2865                        editor.display_to_pixel_point(target_line_end, editor_snapshot, cx)
2866                    })?;
2867                    element.prepaint_as_root(
2868                        text_bounds.origin + origin + point(PADDING_X, px(0.)),
2869                        AvailableSpace::min_size(),
2870                        cx,
2871                    );
2872                    Some(element)
2873                }
2874            }
2875            InlineCompletion::Edit(edits) => {
2876                let edit_start = edits
2877                    .first()
2878                    .unwrap()
2879                    .0
2880                    .start
2881                    .to_display_point(editor_snapshot);
2882                let edit_end = edits
2883                    .last()
2884                    .unwrap()
2885                    .0
2886                    .end
2887                    .to_display_point(editor_snapshot);
2888
2889                let is_visible = visible_row_range.contains(&edit_start.row())
2890                    || visible_row_range.contains(&edit_end.row());
2891                if !is_visible {
2892                    return None;
2893                }
2894
2895                if all_edits_insertions_or_deletions(edits, &editor_snapshot.buffer_snapshot) {
2896                    return None;
2897                }
2898
2899                let (text, highlights) = inline_completion_popover_text(editor_snapshot, edits, cx);
2900                let line_count = text.lines().count() + 1;
2901
2902                let longest_row =
2903                    editor_snapshot.longest_row_in_range(edit_start.row()..edit_end.row() + 1);
2904                let longest_line_width = if visible_row_range.contains(&longest_row) {
2905                    line_layouts[(longest_row.0 - visible_row_range.start.0) as usize].width
2906                } else {
2907                    layout_line(
2908                        longest_row,
2909                        editor_snapshot,
2910                        style,
2911                        editor_width,
2912                        |_| false,
2913                        cx,
2914                    )
2915                    .width
2916                };
2917
2918                let styled_text =
2919                    gpui::StyledText::new(text).with_highlights(&style.text, highlights);
2920
2921                let mut element = div()
2922                    .bg(cx.theme().colors().editor_background)
2923                    .border_1()
2924                    .border_color(cx.theme().colors().border)
2925                    .rounded_md()
2926                    .px_1()
2927                    .child(styled_text)
2928                    .into_any();
2929
2930                let element_bounds = element.layout_as_root(AvailableSpace::min_size(), cx);
2931                let is_fully_visible =
2932                    editor_width >= longest_line_width + PADDING_X + element_bounds.width;
2933
2934                let origin = if is_fully_visible {
2935                    text_bounds.origin
2936                        + point(
2937                            longest_line_width + PADDING_X - scroll_pixel_position.x,
2938                            edit_start.row().as_f32() * line_height - scroll_pixel_position.y,
2939                        )
2940                } else {
2941                    let target_above =
2942                        DisplayRow(edit_start.row().0.saturating_sub(line_count as u32));
2943                    let row_target = if visible_row_range
2944                        .contains(&DisplayRow(target_above.0.saturating_sub(1)))
2945                    {
2946                        target_above
2947                    } else {
2948                        DisplayRow(edit_end.row().0 + 1)
2949                    };
2950
2951                    text_bounds.origin
2952                        + point(
2953                            -scroll_pixel_position.x,
2954                            row_target.as_f32() * line_height - scroll_pixel_position.y,
2955                        )
2956                };
2957
2958                element.prepaint_as_root(origin, element_bounds.into(), cx);
2959                Some(element)
2960            }
2961        }
2962    }
2963
2964    fn layout_mouse_context_menu(
2965        &self,
2966        editor_snapshot: &EditorSnapshot,
2967        visible_range: Range<DisplayRow>,
2968        content_origin: gpui::Point<Pixels>,
2969        cx: &mut WindowContext,
2970    ) -> Option<AnyElement> {
2971        let position = self.editor.update(cx, |editor, cx| {
2972            let visible_start_point = editor.display_to_pixel_point(
2973                DisplayPoint::new(visible_range.start, 0),
2974                editor_snapshot,
2975                cx,
2976            )?;
2977            let visible_end_point = editor.display_to_pixel_point(
2978                DisplayPoint::new(visible_range.end, 0),
2979                editor_snapshot,
2980                cx,
2981            )?;
2982
2983            let mouse_context_menu = editor.mouse_context_menu.as_ref()?;
2984            let (source_display_point, position) = match mouse_context_menu.position {
2985                MenuPosition::PinnedToScreen(point) => (None, point),
2986                MenuPosition::PinnedToEditor { source, offset } => {
2987                    let source_display_point = source.to_display_point(editor_snapshot);
2988                    let source_point = editor.to_pixel_point(source, editor_snapshot, cx)?;
2989                    let position = content_origin + source_point + offset;
2990                    (Some(source_display_point), position)
2991                }
2992            };
2993
2994            let source_included = source_display_point.map_or(true, |source_display_point| {
2995                visible_range
2996                    .to_inclusive()
2997                    .contains(&source_display_point.row())
2998            });
2999            let position_included =
3000                visible_start_point.y <= position.y && position.y <= visible_end_point.y;
3001            if !source_included && !position_included {
3002                None
3003            } else {
3004                Some(position)
3005            }
3006        })?;
3007
3008        let mut element = self.editor.update(cx, |editor, _| {
3009            let mouse_context_menu = editor.mouse_context_menu.as_ref()?;
3010            let context_menu = mouse_context_menu.context_menu.clone();
3011
3012            Some(
3013                deferred(
3014                    anchored()
3015                        .position(position)
3016                        .child(context_menu)
3017                        .anchor(AnchorCorner::TopLeft)
3018                        .snap_to_window_with_margin(px(8.)),
3019                )
3020                .with_priority(1)
3021                .into_any(),
3022            )
3023        })?;
3024
3025        element.prepaint_as_root(position, AvailableSpace::min_size(), cx);
3026        Some(element)
3027    }
3028
3029    #[allow(clippy::too_many_arguments)]
3030    fn layout_hover_popovers(
3031        &self,
3032        snapshot: &EditorSnapshot,
3033        hitbox: &Hitbox,
3034        text_hitbox: &Hitbox,
3035        visible_display_row_range: Range<DisplayRow>,
3036        content_origin: gpui::Point<Pixels>,
3037        scroll_pixel_position: gpui::Point<Pixels>,
3038        line_layouts: &[LineWithInvisibles],
3039        line_height: Pixels,
3040        em_width: Pixels,
3041        cx: &mut WindowContext,
3042    ) {
3043        struct MeasuredHoverPopover {
3044            element: AnyElement,
3045            size: Size<Pixels>,
3046            horizontal_offset: Pixels,
3047        }
3048
3049        let max_size = size(
3050            (120. * em_width) // Default size
3051                .min(hitbox.size.width / 2.) // Shrink to half of the editor width
3052                .max(MIN_POPOVER_CHARACTER_WIDTH * em_width), // Apply minimum width of 20 characters
3053            (16. * line_height) // Default size
3054                .min(hitbox.size.height / 2.) // Shrink to half of the editor height
3055                .max(MIN_POPOVER_LINE_HEIGHT * line_height), // Apply minimum height of 4 lines
3056        );
3057
3058        let hover_popovers = self.editor.update(cx, |editor, cx| {
3059            editor
3060                .hover_state
3061                .render(snapshot, visible_display_row_range.clone(), max_size, cx)
3062        });
3063        let Some((position, hover_popovers)) = hover_popovers else {
3064            return;
3065        };
3066
3067        // This is safe because we check on layout whether the required row is available
3068        let hovered_row_layout =
3069            &line_layouts[position.row().minus(visible_display_row_range.start) as usize];
3070
3071        // Compute Hovered Point
3072        let x =
3073            hovered_row_layout.x_for_index(position.column() as usize) - scroll_pixel_position.x;
3074        let y = position.row().as_f32() * line_height - scroll_pixel_position.y;
3075        let hovered_point = content_origin + point(x, y);
3076
3077        let mut overall_height = Pixels::ZERO;
3078        let mut measured_hover_popovers = Vec::new();
3079        for mut hover_popover in hover_popovers {
3080            let size = hover_popover.layout_as_root(AvailableSpace::min_size(), cx);
3081            let horizontal_offset =
3082                (text_hitbox.upper_right().x - (hovered_point.x + size.width)).min(Pixels::ZERO);
3083
3084            overall_height += HOVER_POPOVER_GAP + size.height;
3085
3086            measured_hover_popovers.push(MeasuredHoverPopover {
3087                element: hover_popover,
3088                size,
3089                horizontal_offset,
3090            });
3091        }
3092        overall_height += HOVER_POPOVER_GAP;
3093
3094        fn draw_occluder(width: Pixels, origin: gpui::Point<Pixels>, cx: &mut WindowContext) {
3095            let mut occlusion = div()
3096                .size_full()
3097                .occlude()
3098                .on_mouse_move(|_, cx| cx.stop_propagation())
3099                .into_any_element();
3100            occlusion.layout_as_root(size(width, HOVER_POPOVER_GAP).into(), cx);
3101            cx.defer_draw(occlusion, origin, 2);
3102        }
3103
3104        if hovered_point.y > overall_height {
3105            // There is enough space above. Render popovers above the hovered point
3106            let mut current_y = hovered_point.y;
3107            for (position, popover) in measured_hover_popovers.into_iter().with_position() {
3108                let size = popover.size;
3109                let popover_origin = point(
3110                    hovered_point.x + popover.horizontal_offset,
3111                    current_y - size.height,
3112                );
3113
3114                cx.defer_draw(popover.element, popover_origin, 2);
3115                if position != itertools::Position::Last {
3116                    let origin = point(popover_origin.x, popover_origin.y - HOVER_POPOVER_GAP);
3117                    draw_occluder(size.width, origin, cx);
3118                }
3119
3120                current_y = popover_origin.y - HOVER_POPOVER_GAP;
3121            }
3122        } else {
3123            // There is not enough space above. Render popovers below the hovered point
3124            let mut current_y = hovered_point.y + line_height;
3125            for (position, popover) in measured_hover_popovers.into_iter().with_position() {
3126                let size = popover.size;
3127                let popover_origin = point(hovered_point.x + popover.horizontal_offset, current_y);
3128
3129                cx.defer_draw(popover.element, popover_origin, 2);
3130                if position != itertools::Position::Last {
3131                    let origin = point(popover_origin.x, popover_origin.y + size.height);
3132                    draw_occluder(size.width, origin, cx);
3133                }
3134
3135                current_y = popover_origin.y + size.height + HOVER_POPOVER_GAP;
3136            }
3137        }
3138    }
3139
3140    #[allow(clippy::too_many_arguments)]
3141    fn layout_signature_help(
3142        &self,
3143        hitbox: &Hitbox,
3144        content_origin: gpui::Point<Pixels>,
3145        scroll_pixel_position: gpui::Point<Pixels>,
3146        newest_selection_head: Option<DisplayPoint>,
3147        start_row: DisplayRow,
3148        line_layouts: &[LineWithInvisibles],
3149        line_height: Pixels,
3150        em_width: Pixels,
3151        cx: &mut WindowContext,
3152    ) {
3153        if !self.editor.focus_handle(cx).is_focused(cx) {
3154            return;
3155        }
3156        let Some(newest_selection_head) = newest_selection_head else {
3157            return;
3158        };
3159        let selection_row = newest_selection_head.row();
3160        if selection_row < start_row {
3161            return;
3162        }
3163        let Some(cursor_row_layout) = line_layouts.get(selection_row.minus(start_row) as usize)
3164        else {
3165            return;
3166        };
3167
3168        let start_x = cursor_row_layout.x_for_index(newest_selection_head.column() as usize)
3169            - scroll_pixel_position.x
3170            + content_origin.x;
3171        let start_y =
3172            selection_row.as_f32() * line_height + content_origin.y - scroll_pixel_position.y;
3173
3174        let max_size = size(
3175            (120. * em_width) // Default size
3176                .min(hitbox.size.width / 2.) // Shrink to half of the editor width
3177                .max(MIN_POPOVER_CHARACTER_WIDTH * em_width), // Apply minimum width of 20 characters
3178            (16. * line_height) // Default size
3179                .min(hitbox.size.height / 2.) // Shrink to half of the editor height
3180                .max(MIN_POPOVER_LINE_HEIGHT * line_height), // Apply minimum height of 4 lines
3181        );
3182
3183        let maybe_element = self.editor.update(cx, |editor, cx| {
3184            if let Some(popover) = editor.signature_help_state.popover_mut() {
3185                let element = popover.render(
3186                    &self.style,
3187                    max_size,
3188                    editor.workspace.as_ref().map(|(w, _)| w.clone()),
3189                    cx,
3190                );
3191                Some(element)
3192            } else {
3193                None
3194            }
3195        });
3196        if let Some(mut element) = maybe_element {
3197            let window_size = cx.viewport_size();
3198            let size = element.layout_as_root(Size::<AvailableSpace>::default(), cx);
3199            let mut point = point(start_x, start_y - size.height);
3200
3201            // Adjusting to ensure the popover does not overflow in the X-axis direction.
3202            if point.x + size.width >= window_size.width {
3203                point.x = window_size.width - size.width;
3204            }
3205
3206            cx.defer_draw(element, point, 1)
3207        }
3208    }
3209
3210    fn paint_background(&self, layout: &EditorLayout, cx: &mut WindowContext) {
3211        cx.paint_layer(layout.hitbox.bounds, |cx| {
3212            let scroll_top = layout.position_map.snapshot.scroll_position().y;
3213            let gutter_bg = cx.theme().colors().editor_gutter_background;
3214            cx.paint_quad(fill(layout.gutter_hitbox.bounds, gutter_bg));
3215            cx.paint_quad(fill(layout.text_hitbox.bounds, self.style.background));
3216
3217            if let EditorMode::Full = layout.mode {
3218                let mut active_rows = layout.active_rows.iter().peekable();
3219                while let Some((start_row, contains_non_empty_selection)) = active_rows.next() {
3220                    let mut end_row = start_row.0;
3221                    while active_rows
3222                        .peek()
3223                        .map_or(false, |(active_row, has_selection)| {
3224                            active_row.0 == end_row + 1
3225                                && *has_selection == contains_non_empty_selection
3226                        })
3227                    {
3228                        active_rows.next().unwrap();
3229                        end_row += 1;
3230                    }
3231
3232                    if !contains_non_empty_selection {
3233                        let highlight_h_range =
3234                            match layout.position_map.snapshot.current_line_highlight {
3235                                CurrentLineHighlight::Gutter => Some(Range {
3236                                    start: layout.hitbox.left(),
3237                                    end: layout.gutter_hitbox.right(),
3238                                }),
3239                                CurrentLineHighlight::Line => Some(Range {
3240                                    start: layout.text_hitbox.bounds.left(),
3241                                    end: layout.text_hitbox.bounds.right(),
3242                                }),
3243                                CurrentLineHighlight::All => Some(Range {
3244                                    start: layout.hitbox.left(),
3245                                    end: layout.hitbox.right(),
3246                                }),
3247                                CurrentLineHighlight::None => None,
3248                            };
3249                        if let Some(range) = highlight_h_range {
3250                            let active_line_bg = cx.theme().colors().editor_active_line_background;
3251                            let bounds = Bounds {
3252                                origin: point(
3253                                    range.start,
3254                                    layout.hitbox.origin.y
3255                                        + (start_row.as_f32() - scroll_top)
3256                                            * layout.position_map.line_height,
3257                                ),
3258                                size: size(
3259                                    range.end - range.start,
3260                                    layout.position_map.line_height
3261                                        * (end_row - start_row.0 + 1) as f32,
3262                                ),
3263                            };
3264                            cx.paint_quad(fill(bounds, active_line_bg));
3265                        }
3266                    }
3267                }
3268
3269                let mut paint_highlight =
3270                    |highlight_row_start: DisplayRow, highlight_row_end: DisplayRow, color| {
3271                        let origin = point(
3272                            layout.hitbox.origin.x,
3273                            layout.hitbox.origin.y
3274                                + (highlight_row_start.as_f32() - scroll_top)
3275                                    * layout.position_map.line_height,
3276                        );
3277                        let size = size(
3278                            layout.hitbox.size.width,
3279                            layout.position_map.line_height
3280                                * highlight_row_end.next_row().minus(highlight_row_start) as f32,
3281                        );
3282                        cx.paint_quad(fill(Bounds { origin, size }, color));
3283                    };
3284
3285                let mut current_paint: Option<(Hsla, Range<DisplayRow>)> = None;
3286                for (&new_row, &new_color) in &layout.highlighted_rows {
3287                    match &mut current_paint {
3288                        Some((current_color, current_range)) => {
3289                            let current_color = *current_color;
3290                            let new_range_started = current_color != new_color
3291                                || current_range.end.next_row() != new_row;
3292                            if new_range_started {
3293                                paint_highlight(
3294                                    current_range.start,
3295                                    current_range.end,
3296                                    current_color,
3297                                );
3298                                current_paint = Some((new_color, new_row..new_row));
3299                                continue;
3300                            } else {
3301                                current_range.end = current_range.end.next_row();
3302                            }
3303                        }
3304                        None => current_paint = Some((new_color, new_row..new_row)),
3305                    };
3306                }
3307                if let Some((color, range)) = current_paint {
3308                    paint_highlight(range.start, range.end, color);
3309                }
3310
3311                let scroll_left =
3312                    layout.position_map.snapshot.scroll_position().x * layout.position_map.em_width;
3313
3314                for (wrap_position, active) in layout.wrap_guides.iter() {
3315                    let x = (layout.text_hitbox.origin.x
3316                        + *wrap_position
3317                        + layout.position_map.em_width / 2.)
3318                        - scroll_left;
3319
3320                    let show_scrollbars = layout
3321                        .scrollbar_layout
3322                        .as_ref()
3323                        .map_or(false, |scrollbar| scrollbar.visible);
3324                    if x < layout.text_hitbox.origin.x
3325                        || (show_scrollbars && x > self.scrollbar_left(&layout.hitbox.bounds))
3326                    {
3327                        continue;
3328                    }
3329
3330                    let color = if *active {
3331                        cx.theme().colors().editor_active_wrap_guide
3332                    } else {
3333                        cx.theme().colors().editor_wrap_guide
3334                    };
3335                    cx.paint_quad(fill(
3336                        Bounds {
3337                            origin: point(x, layout.text_hitbox.origin.y),
3338                            size: size(px(1.), layout.text_hitbox.size.height),
3339                        },
3340                        color,
3341                    ));
3342                }
3343            }
3344        })
3345    }
3346
3347    fn paint_indent_guides(&mut self, layout: &mut EditorLayout, cx: &mut WindowContext) {
3348        let Some(indent_guides) = &layout.indent_guides else {
3349            return;
3350        };
3351
3352        let faded_color = |color: Hsla, alpha: f32| {
3353            let mut faded = color;
3354            faded.a = alpha;
3355            faded
3356        };
3357
3358        for indent_guide in indent_guides {
3359            let indent_accent_colors = cx.theme().accents().color_for_index(indent_guide.depth);
3360            let settings = indent_guide.settings;
3361
3362            // TODO fixed for now, expose them through themes later
3363            const INDENT_AWARE_ALPHA: f32 = 0.2;
3364            const INDENT_AWARE_ACTIVE_ALPHA: f32 = 0.4;
3365            const INDENT_AWARE_BACKGROUND_ALPHA: f32 = 0.1;
3366            const INDENT_AWARE_BACKGROUND_ACTIVE_ALPHA: f32 = 0.2;
3367
3368            let line_color = match (settings.coloring, indent_guide.active) {
3369                (IndentGuideColoring::Disabled, _) => None,
3370                (IndentGuideColoring::Fixed, false) => {
3371                    Some(cx.theme().colors().editor_indent_guide)
3372                }
3373                (IndentGuideColoring::Fixed, true) => {
3374                    Some(cx.theme().colors().editor_indent_guide_active)
3375                }
3376                (IndentGuideColoring::IndentAware, false) => {
3377                    Some(faded_color(indent_accent_colors, INDENT_AWARE_ALPHA))
3378                }
3379                (IndentGuideColoring::IndentAware, true) => {
3380                    Some(faded_color(indent_accent_colors, INDENT_AWARE_ACTIVE_ALPHA))
3381                }
3382            };
3383
3384            let background_color = match (settings.background_coloring, indent_guide.active) {
3385                (IndentGuideBackgroundColoring::Disabled, _) => None,
3386                (IndentGuideBackgroundColoring::IndentAware, false) => Some(faded_color(
3387                    indent_accent_colors,
3388                    INDENT_AWARE_BACKGROUND_ALPHA,
3389                )),
3390                (IndentGuideBackgroundColoring::IndentAware, true) => Some(faded_color(
3391                    indent_accent_colors,
3392                    INDENT_AWARE_BACKGROUND_ACTIVE_ALPHA,
3393                )),
3394            };
3395
3396            let requested_line_width = if indent_guide.active {
3397                settings.active_line_width
3398            } else {
3399                settings.line_width
3400            }
3401            .clamp(1, 10);
3402            let mut line_indicator_width = 0.;
3403            if let Some(color) = line_color {
3404                cx.paint_quad(fill(
3405                    Bounds {
3406                        origin: indent_guide.origin,
3407                        size: size(px(requested_line_width as f32), indent_guide.length),
3408                    },
3409                    color,
3410                ));
3411                line_indicator_width = requested_line_width as f32;
3412            }
3413
3414            if let Some(color) = background_color {
3415                let width = indent_guide.single_indent_width - px(line_indicator_width);
3416                cx.paint_quad(fill(
3417                    Bounds {
3418                        origin: point(
3419                            indent_guide.origin.x + px(line_indicator_width),
3420                            indent_guide.origin.y,
3421                        ),
3422                        size: size(width, indent_guide.length),
3423                    },
3424                    color,
3425                ));
3426            }
3427        }
3428    }
3429
3430    fn paint_line_numbers(&mut self, layout: &mut EditorLayout, cx: &mut WindowContext) {
3431        let line_height = layout.position_map.line_height;
3432        let scroll_position = layout.position_map.snapshot.scroll_position();
3433        let scroll_top = scroll_position.y * line_height;
3434
3435        cx.set_cursor_style(CursorStyle::Arrow, &layout.gutter_hitbox);
3436
3437        for (ix, line) in layout.line_numbers.iter().enumerate() {
3438            if let Some(line) = line {
3439                let line_origin = layout.gutter_hitbox.origin
3440                    + point(
3441                        layout.gutter_hitbox.size.width
3442                            - line.width
3443                            - layout.gutter_dimensions.right_padding,
3444                        ix as f32 * line_height - (scroll_top % line_height),
3445                    );
3446
3447                line.paint(line_origin, line_height, cx).log_err();
3448            }
3449        }
3450    }
3451
3452    fn paint_diff_hunks(layout: &mut EditorLayout, cx: &mut WindowContext) {
3453        if layout.display_hunks.is_empty() {
3454            return;
3455        }
3456
3457        let line_height = layout.position_map.line_height;
3458        cx.paint_layer(layout.gutter_hitbox.bounds, |cx| {
3459            for (hunk, hitbox) in &layout.display_hunks {
3460                let hunk_to_paint = match hunk {
3461                    DisplayDiffHunk::Folded { .. } => {
3462                        let hunk_bounds = Self::diff_hunk_bounds(
3463                            &layout.position_map.snapshot,
3464                            line_height,
3465                            layout.gutter_hitbox.bounds,
3466                            hunk,
3467                        );
3468                        Some((
3469                            hunk_bounds,
3470                            cx.theme().status().modified,
3471                            Corners::all(px(0.)),
3472                        ))
3473                    }
3474                    DisplayDiffHunk::Unfolded { status, .. } => {
3475                        hitbox.as_ref().map(|hunk_hitbox| match status {
3476                            DiffHunkStatus::Added => (
3477                                hunk_hitbox.bounds,
3478                                cx.theme().status().created,
3479                                Corners::all(px(0.)),
3480                            ),
3481                            DiffHunkStatus::Modified => (
3482                                hunk_hitbox.bounds,
3483                                cx.theme().status().modified,
3484                                Corners::all(px(0.)),
3485                            ),
3486                            DiffHunkStatus::Removed => (
3487                                Bounds::new(
3488                                    point(
3489                                        hunk_hitbox.origin.x - hunk_hitbox.size.width,
3490                                        hunk_hitbox.origin.y,
3491                                    ),
3492                                    size(hunk_hitbox.size.width * px(2.), hunk_hitbox.size.height),
3493                                ),
3494                                cx.theme().status().deleted,
3495                                Corners::all(1. * line_height),
3496                            ),
3497                        })
3498                    }
3499                };
3500
3501                if let Some((hunk_bounds, background_color, corner_radii)) = hunk_to_paint {
3502                    cx.paint_quad(quad(
3503                        hunk_bounds,
3504                        corner_radii,
3505                        background_color,
3506                        Edges::default(),
3507                        transparent_black(),
3508                    ));
3509                }
3510            }
3511        });
3512    }
3513
3514    pub(super) fn diff_hunk_bounds(
3515        snapshot: &EditorSnapshot,
3516        line_height: Pixels,
3517        gutter_bounds: Bounds<Pixels>,
3518        hunk: &DisplayDiffHunk,
3519    ) -> Bounds<Pixels> {
3520        let scroll_position = snapshot.scroll_position();
3521        let scroll_top = scroll_position.y * line_height;
3522
3523        match hunk {
3524            DisplayDiffHunk::Folded { display_row, .. } => {
3525                let start_y = display_row.as_f32() * line_height - scroll_top;
3526                let end_y = start_y + line_height;
3527
3528                let width = Self::diff_hunk_strip_width(line_height);
3529                let highlight_origin = gutter_bounds.origin + point(px(0.), start_y);
3530                let highlight_size = size(width, end_y - start_y);
3531                Bounds::new(highlight_origin, highlight_size)
3532            }
3533            DisplayDiffHunk::Unfolded {
3534                display_row_range,
3535                status,
3536                ..
3537            } => match status {
3538                DiffHunkStatus::Added | DiffHunkStatus::Modified => {
3539                    let start_row = display_row_range.start;
3540                    let end_row = display_row_range.end;
3541                    // If we're in a multibuffer, row range span might include an
3542                    // excerpt header, so if we were to draw the marker straight away,
3543                    // the hunk might include the rows of that header.
3544                    // Making the range inclusive doesn't quite cut it, as we rely on the exclusivity for the soft wrap.
3545                    // Instead, we simply check whether the range we're dealing with includes
3546                    // any excerpt headers and if so, we stop painting the diff hunk on the first row of that header.
3547                    let end_row_in_current_excerpt = snapshot
3548                        .blocks_in_range(start_row..end_row)
3549                        .find_map(|(start_row, block)| {
3550                            if matches!(block, Block::ExcerptBoundary { .. }) {
3551                                Some(start_row)
3552                            } else {
3553                                None
3554                            }
3555                        })
3556                        .unwrap_or(end_row);
3557
3558                    let start_y = start_row.as_f32() * line_height - scroll_top;
3559                    let end_y = end_row_in_current_excerpt.as_f32() * line_height - scroll_top;
3560
3561                    let width = Self::diff_hunk_strip_width(line_height);
3562                    let highlight_origin = gutter_bounds.origin + point(px(0.), start_y);
3563                    let highlight_size = size(width, end_y - start_y);
3564                    Bounds::new(highlight_origin, highlight_size)
3565                }
3566                DiffHunkStatus::Removed => {
3567                    let row = display_row_range.start;
3568
3569                    let offset = line_height / 2.;
3570                    let start_y = row.as_f32() * line_height - offset - scroll_top;
3571                    let end_y = start_y + line_height;
3572
3573                    let width = (0.35 * line_height).floor();
3574                    let highlight_origin = gutter_bounds.origin + point(px(0.), start_y);
3575                    let highlight_size = size(width, end_y - start_y);
3576                    Bounds::new(highlight_origin, highlight_size)
3577                }
3578            },
3579        }
3580    }
3581
3582    /// Returns the width of the diff strip that will be displayed in the gutter.
3583    pub(super) fn diff_hunk_strip_width(line_height: Pixels) -> Pixels {
3584        // We floor the value to prevent pixel rounding.
3585        (0.275 * line_height).floor()
3586    }
3587
3588    fn paint_gutter_indicators(&self, layout: &mut EditorLayout, cx: &mut WindowContext) {
3589        cx.paint_layer(layout.gutter_hitbox.bounds, |cx| {
3590            cx.with_element_namespace("crease_toggles", |cx| {
3591                for crease_toggle in layout.crease_toggles.iter_mut().flatten() {
3592                    crease_toggle.paint(cx);
3593                }
3594            });
3595
3596            for test_indicator in layout.test_indicators.iter_mut() {
3597                test_indicator.paint(cx);
3598            }
3599
3600            if let Some(indicator) = layout.code_actions_indicator.as_mut() {
3601                indicator.paint(cx);
3602            }
3603        });
3604    }
3605
3606    fn paint_gutter_highlights(&self, layout: &mut EditorLayout, cx: &mut WindowContext) {
3607        for (_, hunk_hitbox) in &layout.display_hunks {
3608            if let Some(hunk_hitbox) = hunk_hitbox {
3609                cx.set_cursor_style(CursorStyle::PointingHand, hunk_hitbox);
3610            }
3611        }
3612
3613        let show_git_gutter = layout
3614            .position_map
3615            .snapshot
3616            .show_git_diff_gutter
3617            .unwrap_or_else(|| {
3618                matches!(
3619                    ProjectSettings::get_global(cx).git.git_gutter,
3620                    Some(GitGutterSetting::TrackedFiles)
3621                )
3622            });
3623        if show_git_gutter {
3624            Self::paint_diff_hunks(layout, cx)
3625        }
3626
3627        let highlight_width = 0.275 * layout.position_map.line_height;
3628        let highlight_corner_radii = Corners::all(0.05 * layout.position_map.line_height);
3629        cx.paint_layer(layout.gutter_hitbox.bounds, |cx| {
3630            for (range, color) in &layout.highlighted_gutter_ranges {
3631                let start_row = if range.start.row() < layout.visible_display_row_range.start {
3632                    layout.visible_display_row_range.start - DisplayRow(1)
3633                } else {
3634                    range.start.row()
3635                };
3636                let end_row = if range.end.row() > layout.visible_display_row_range.end {
3637                    layout.visible_display_row_range.end + DisplayRow(1)
3638                } else {
3639                    range.end.row()
3640                };
3641
3642                let start_y = layout.gutter_hitbox.top()
3643                    + start_row.0 as f32 * layout.position_map.line_height
3644                    - layout.position_map.scroll_pixel_position.y;
3645                let end_y = layout.gutter_hitbox.top()
3646                    + (end_row.0 + 1) as f32 * layout.position_map.line_height
3647                    - layout.position_map.scroll_pixel_position.y;
3648                let bounds = Bounds::from_corners(
3649                    point(layout.gutter_hitbox.left(), start_y),
3650                    point(layout.gutter_hitbox.left() + highlight_width, end_y),
3651                );
3652                cx.paint_quad(fill(bounds, *color).corner_radii(highlight_corner_radii));
3653            }
3654        });
3655    }
3656
3657    fn paint_blamed_display_rows(&self, layout: &mut EditorLayout, cx: &mut WindowContext) {
3658        let Some(blamed_display_rows) = layout.blamed_display_rows.take() else {
3659            return;
3660        };
3661
3662        cx.paint_layer(layout.gutter_hitbox.bounds, |cx| {
3663            for mut blame_element in blamed_display_rows.into_iter() {
3664                blame_element.paint(cx);
3665            }
3666        })
3667    }
3668
3669    fn paint_text(&mut self, layout: &mut EditorLayout, cx: &mut WindowContext) {
3670        cx.with_content_mask(
3671            Some(ContentMask {
3672                bounds: layout.text_hitbox.bounds,
3673            }),
3674            |cx| {
3675                let cursor_style = if self
3676                    .editor
3677                    .read(cx)
3678                    .hovered_link_state
3679                    .as_ref()
3680                    .is_some_and(|hovered_link_state| !hovered_link_state.links.is_empty())
3681                {
3682                    CursorStyle::PointingHand
3683                } else {
3684                    CursorStyle::IBeam
3685                };
3686                cx.set_cursor_style(cursor_style, &layout.text_hitbox);
3687
3688                let invisible_display_ranges = self.paint_highlights(layout, cx);
3689                self.paint_lines(&invisible_display_ranges, layout, cx);
3690                self.paint_redactions(layout, cx);
3691                self.paint_cursors(layout, cx);
3692                self.paint_inline_blame(layout, cx);
3693                cx.with_element_namespace("crease_trailers", |cx| {
3694                    for trailer in layout.crease_trailers.iter_mut().flatten() {
3695                        trailer.element.paint(cx);
3696                    }
3697                });
3698            },
3699        )
3700    }
3701
3702    fn paint_highlights(
3703        &mut self,
3704        layout: &mut EditorLayout,
3705        cx: &mut WindowContext,
3706    ) -> SmallVec<[Range<DisplayPoint>; 32]> {
3707        cx.paint_layer(layout.text_hitbox.bounds, |cx| {
3708            let mut invisible_display_ranges = SmallVec::<[Range<DisplayPoint>; 32]>::new();
3709            let line_end_overshoot = 0.15 * layout.position_map.line_height;
3710            for (range, color) in &layout.highlighted_ranges {
3711                self.paint_highlighted_range(
3712                    range.clone(),
3713                    *color,
3714                    Pixels::ZERO,
3715                    line_end_overshoot,
3716                    layout,
3717                    cx,
3718                );
3719            }
3720
3721            let corner_radius = 0.15 * layout.position_map.line_height;
3722
3723            for (player_color, selections) in &layout.selections {
3724                for selection in selections.iter() {
3725                    self.paint_highlighted_range(
3726                        selection.range.clone(),
3727                        player_color.selection,
3728                        corner_radius,
3729                        corner_radius * 2.,
3730                        layout,
3731                        cx,
3732                    );
3733
3734                    if selection.is_local && !selection.range.is_empty() {
3735                        invisible_display_ranges.push(selection.range.clone());
3736                    }
3737                }
3738            }
3739            invisible_display_ranges
3740        })
3741    }
3742
3743    fn paint_lines(
3744        &mut self,
3745        invisible_display_ranges: &[Range<DisplayPoint>],
3746        layout: &mut EditorLayout,
3747        cx: &mut WindowContext,
3748    ) {
3749        let whitespace_setting = self
3750            .editor
3751            .read(cx)
3752            .buffer
3753            .read(cx)
3754            .settings_at(0, cx)
3755            .show_whitespaces;
3756
3757        for (ix, line_with_invisibles) in layout.position_map.line_layouts.iter().enumerate() {
3758            let row = DisplayRow(layout.visible_display_row_range.start.0 + ix as u32);
3759            line_with_invisibles.draw(
3760                layout,
3761                row,
3762                layout.content_origin,
3763                whitespace_setting,
3764                invisible_display_ranges,
3765                cx,
3766            )
3767        }
3768
3769        for line_element in &mut layout.line_elements {
3770            line_element.paint(cx);
3771        }
3772    }
3773
3774    fn paint_redactions(&mut self, layout: &EditorLayout, cx: &mut WindowContext) {
3775        if layout.redacted_ranges.is_empty() {
3776            return;
3777        }
3778
3779        let line_end_overshoot = layout.line_end_overshoot();
3780
3781        // A softer than perfect black
3782        let redaction_color = gpui::rgb(0x0e1111);
3783
3784        cx.paint_layer(layout.text_hitbox.bounds, |cx| {
3785            for range in layout.redacted_ranges.iter() {
3786                self.paint_highlighted_range(
3787                    range.clone(),
3788                    redaction_color.into(),
3789                    Pixels::ZERO,
3790                    line_end_overshoot,
3791                    layout,
3792                    cx,
3793                );
3794            }
3795        });
3796    }
3797
3798    fn paint_cursors(&mut self, layout: &mut EditorLayout, cx: &mut WindowContext) {
3799        for cursor in &mut layout.visible_cursors {
3800            cursor.paint(layout.content_origin, cx);
3801        }
3802    }
3803
3804    fn paint_scrollbar(&mut self, layout: &mut EditorLayout, cx: &mut WindowContext) {
3805        let Some(scrollbar_layout) = layout.scrollbar_layout.as_ref() else {
3806            return;
3807        };
3808
3809        let thumb_bounds = scrollbar_layout.thumb_bounds();
3810        if scrollbar_layout.visible {
3811            cx.paint_layer(scrollbar_layout.hitbox.bounds, |cx| {
3812                cx.paint_quad(quad(
3813                    scrollbar_layout.hitbox.bounds,
3814                    Corners::default(),
3815                    cx.theme().colors().scrollbar_track_background,
3816                    Edges {
3817                        top: Pixels::ZERO,
3818                        right: Pixels::ZERO,
3819                        bottom: Pixels::ZERO,
3820                        left: ScrollbarLayout::BORDER_WIDTH,
3821                    },
3822                    cx.theme().colors().scrollbar_track_border,
3823                ));
3824
3825                let fast_markers =
3826                    self.collect_fast_scrollbar_markers(layout, scrollbar_layout, cx);
3827                // Refresh slow scrollbar markers in the background. Below, we paint whatever markers have already been computed.
3828                self.refresh_slow_scrollbar_markers(layout, scrollbar_layout, cx);
3829
3830                let markers = self.editor.read(cx).scrollbar_marker_state.markers.clone();
3831                for marker in markers.iter().chain(&fast_markers) {
3832                    let mut marker = marker.clone();
3833                    marker.bounds.origin += scrollbar_layout.hitbox.origin;
3834                    cx.paint_quad(marker);
3835                }
3836
3837                cx.paint_quad(quad(
3838                    thumb_bounds,
3839                    Corners::default(),
3840                    cx.theme().colors().scrollbar_thumb_background,
3841                    Edges {
3842                        top: Pixels::ZERO,
3843                        right: Pixels::ZERO,
3844                        bottom: Pixels::ZERO,
3845                        left: ScrollbarLayout::BORDER_WIDTH,
3846                    },
3847                    cx.theme().colors().scrollbar_thumb_border,
3848                ));
3849            });
3850        }
3851
3852        cx.set_cursor_style(CursorStyle::Arrow, &scrollbar_layout.hitbox);
3853
3854        let row_height = scrollbar_layout.row_height;
3855        let row_range = scrollbar_layout.visible_row_range.clone();
3856
3857        cx.on_mouse_event({
3858            let editor = self.editor.clone();
3859            let hitbox = scrollbar_layout.hitbox.clone();
3860            let mut mouse_position = cx.mouse_position();
3861            move |event: &MouseMoveEvent, phase, cx| {
3862                if phase == DispatchPhase::Capture {
3863                    return;
3864                }
3865
3866                editor.update(cx, |editor, cx| {
3867                    if event.pressed_button == Some(MouseButton::Left)
3868                        && editor.scroll_manager.is_dragging_scrollbar()
3869                    {
3870                        let y = mouse_position.y;
3871                        let new_y = event.position.y;
3872                        if (hitbox.top()..hitbox.bottom()).contains(&y) {
3873                            let mut position = editor.scroll_position(cx);
3874                            position.y += (new_y - y) / row_height;
3875                            if position.y < 0.0 {
3876                                position.y = 0.0;
3877                            }
3878                            editor.set_scroll_position(position, cx);
3879                        }
3880
3881                        cx.stop_propagation();
3882                    } else {
3883                        editor.scroll_manager.set_is_dragging_scrollbar(false, cx);
3884                        if hitbox.is_hovered(cx) {
3885                            editor.scroll_manager.show_scrollbar(cx);
3886                        }
3887                    }
3888                    mouse_position = event.position;
3889                })
3890            }
3891        });
3892
3893        if self.editor.read(cx).scroll_manager.is_dragging_scrollbar() {
3894            cx.on_mouse_event({
3895                let editor = self.editor.clone();
3896                move |_: &MouseUpEvent, phase, cx| {
3897                    if phase == DispatchPhase::Capture {
3898                        return;
3899                    }
3900
3901                    editor.update(cx, |editor, cx| {
3902                        editor.scroll_manager.set_is_dragging_scrollbar(false, cx);
3903                        cx.stop_propagation();
3904                    });
3905                }
3906            });
3907        } else {
3908            cx.on_mouse_event({
3909                let editor = self.editor.clone();
3910                let hitbox = scrollbar_layout.hitbox.clone();
3911                move |event: &MouseDownEvent, phase, cx| {
3912                    if phase == DispatchPhase::Capture || !hitbox.is_hovered(cx) {
3913                        return;
3914                    }
3915
3916                    editor.update(cx, |editor, cx| {
3917                        editor.scroll_manager.set_is_dragging_scrollbar(true, cx);
3918
3919                        let y = event.position.y;
3920                        if y < thumb_bounds.top() || thumb_bounds.bottom() < y {
3921                            let center_row = ((y - hitbox.top()) / row_height).round() as u32;
3922                            let top_row = center_row
3923                                .saturating_sub((row_range.end - row_range.start) as u32 / 2);
3924                            let mut position = editor.scroll_position(cx);
3925                            position.y = top_row as f32;
3926                            editor.set_scroll_position(position, cx);
3927                        } else {
3928                            editor.scroll_manager.show_scrollbar(cx);
3929                        }
3930
3931                        cx.stop_propagation();
3932                    });
3933                }
3934            });
3935        }
3936    }
3937
3938    fn collect_fast_scrollbar_markers(
3939        &self,
3940        layout: &EditorLayout,
3941        scrollbar_layout: &ScrollbarLayout,
3942        cx: &mut WindowContext,
3943    ) -> Vec<PaintQuad> {
3944        const LIMIT: usize = 100;
3945        if !EditorSettings::get_global(cx).scrollbar.cursors || layout.cursors.len() > LIMIT {
3946            return vec![];
3947        }
3948        let cursor_ranges = layout
3949            .cursors
3950            .iter()
3951            .map(|(point, color)| ColoredRange {
3952                start: point.row(),
3953                end: point.row(),
3954                color: *color,
3955            })
3956            .collect_vec();
3957        scrollbar_layout.marker_quads_for_ranges(cursor_ranges, None)
3958    }
3959
3960    fn refresh_slow_scrollbar_markers(
3961        &self,
3962        layout: &EditorLayout,
3963        scrollbar_layout: &ScrollbarLayout,
3964        cx: &mut WindowContext,
3965    ) {
3966        self.editor.update(cx, |editor, cx| {
3967            if !editor.is_singleton(cx)
3968                || !editor
3969                    .scrollbar_marker_state
3970                    .should_refresh(scrollbar_layout.hitbox.size)
3971            {
3972                return;
3973            }
3974
3975            let scrollbar_layout = scrollbar_layout.clone();
3976            let background_highlights = editor.background_highlights.clone();
3977            let snapshot = layout.position_map.snapshot.clone();
3978            let theme = cx.theme().clone();
3979            let scrollbar_settings = EditorSettings::get_global(cx).scrollbar;
3980
3981            editor.scrollbar_marker_state.dirty = false;
3982            editor.scrollbar_marker_state.pending_refresh =
3983                Some(cx.spawn(|editor, mut cx| async move {
3984                    let scrollbar_size = scrollbar_layout.hitbox.size;
3985                    let scrollbar_markers = cx
3986                        .background_executor()
3987                        .spawn(async move {
3988                            let max_point = snapshot.display_snapshot.buffer_snapshot.max_point();
3989                            let mut marker_quads = Vec::new();
3990                            if scrollbar_settings.git_diff {
3991                                let marker_row_ranges = snapshot
3992                                    .diff_map
3993                                    .diff_hunks(&snapshot.buffer_snapshot)
3994                                    .map(|hunk| {
3995                                        let start_display_row =
3996                                            MultiBufferPoint::new(hunk.row_range.start.0, 0)
3997                                                .to_display_point(&snapshot.display_snapshot)
3998                                                .row();
3999                                        let mut end_display_row =
4000                                            MultiBufferPoint::new(hunk.row_range.end.0, 0)
4001                                                .to_display_point(&snapshot.display_snapshot)
4002                                                .row();
4003                                        if end_display_row != start_display_row {
4004                                            end_display_row.0 -= 1;
4005                                        }
4006                                        let color = match hunk_status(&hunk) {
4007                                            DiffHunkStatus::Added => theme.status().created,
4008                                            DiffHunkStatus::Modified => theme.status().modified,
4009                                            DiffHunkStatus::Removed => theme.status().deleted,
4010                                        };
4011                                        ColoredRange {
4012                                            start: start_display_row,
4013                                            end: end_display_row,
4014                                            color,
4015                                        }
4016                                    });
4017
4018                                marker_quads.extend(
4019                                    scrollbar_layout
4020                                        .marker_quads_for_ranges(marker_row_ranges, Some(0)),
4021                                );
4022                            }
4023
4024                            for (background_highlight_id, (_, background_ranges)) in
4025                                background_highlights.iter()
4026                            {
4027                                let is_search_highlights = *background_highlight_id
4028                                    == TypeId::of::<BufferSearchHighlights>();
4029                                let is_symbol_occurrences = *background_highlight_id
4030                                    == TypeId::of::<DocumentHighlightRead>()
4031                                    || *background_highlight_id
4032                                        == TypeId::of::<DocumentHighlightWrite>();
4033                                if (is_search_highlights && scrollbar_settings.search_results)
4034                                    || (is_symbol_occurrences && scrollbar_settings.selected_symbol)
4035                                {
4036                                    let mut color = theme.status().info;
4037                                    if is_symbol_occurrences {
4038                                        color.fade_out(0.5);
4039                                    }
4040                                    let marker_row_ranges = background_ranges.iter().map(|range| {
4041                                        let display_start = range
4042                                            .start
4043                                            .to_display_point(&snapshot.display_snapshot);
4044                                        let display_end =
4045                                            range.end.to_display_point(&snapshot.display_snapshot);
4046                                        ColoredRange {
4047                                            start: display_start.row(),
4048                                            end: display_end.row(),
4049                                            color,
4050                                        }
4051                                    });
4052                                    marker_quads.extend(
4053                                        scrollbar_layout
4054                                            .marker_quads_for_ranges(marker_row_ranges, Some(1)),
4055                                    );
4056                                }
4057                            }
4058
4059                            if scrollbar_settings.diagnostics {
4060                                let diagnostics = snapshot
4061                                    .buffer_snapshot
4062                                    .diagnostics_in_range::<_, Point>(
4063                                        Point::zero()..max_point,
4064                                        false,
4065                                    )
4066                                    // We want to sort by severity, in order to paint the most severe diagnostics last.
4067                                    .sorted_by_key(|diagnostic| {
4068                                        std::cmp::Reverse(diagnostic.diagnostic.severity)
4069                                    });
4070
4071                                let marker_row_ranges = diagnostics.into_iter().map(|diagnostic| {
4072                                    let start_display = diagnostic
4073                                        .range
4074                                        .start
4075                                        .to_display_point(&snapshot.display_snapshot);
4076                                    let end_display = diagnostic
4077                                        .range
4078                                        .end
4079                                        .to_display_point(&snapshot.display_snapshot);
4080                                    let color = match diagnostic.diagnostic.severity {
4081                                        DiagnosticSeverity::ERROR => theme.status().error,
4082                                        DiagnosticSeverity::WARNING => theme.status().warning,
4083                                        DiagnosticSeverity::INFORMATION => theme.status().info,
4084                                        _ => theme.status().hint,
4085                                    };
4086                                    ColoredRange {
4087                                        start: start_display.row(),
4088                                        end: end_display.row(),
4089                                        color,
4090                                    }
4091                                });
4092                                marker_quads.extend(
4093                                    scrollbar_layout
4094                                        .marker_quads_for_ranges(marker_row_ranges, Some(2)),
4095                                );
4096                            }
4097
4098                            Arc::from(marker_quads)
4099                        })
4100                        .await;
4101
4102                    editor.update(&mut cx, |editor, cx| {
4103                        editor.scrollbar_marker_state.markers = scrollbar_markers;
4104                        editor.scrollbar_marker_state.scrollbar_size = scrollbar_size;
4105                        editor.scrollbar_marker_state.pending_refresh = None;
4106                        cx.notify();
4107                    })?;
4108
4109                    Ok(())
4110                }));
4111        });
4112    }
4113
4114    #[allow(clippy::too_many_arguments)]
4115    fn paint_highlighted_range(
4116        &self,
4117        range: Range<DisplayPoint>,
4118        color: Hsla,
4119        corner_radius: Pixels,
4120        line_end_overshoot: Pixels,
4121        layout: &EditorLayout,
4122        cx: &mut WindowContext,
4123    ) {
4124        let start_row = layout.visible_display_row_range.start;
4125        let end_row = layout.visible_display_row_range.end;
4126        if range.start != range.end {
4127            let row_range = if range.end.column() == 0 {
4128                cmp::max(range.start.row(), start_row)..cmp::min(range.end.row(), end_row)
4129            } else {
4130                cmp::max(range.start.row(), start_row)
4131                    ..cmp::min(range.end.row().next_row(), end_row)
4132            };
4133
4134            let highlighted_range = HighlightedRange {
4135                color,
4136                line_height: layout.position_map.line_height,
4137                corner_radius,
4138                start_y: layout.content_origin.y
4139                    + row_range.start.as_f32() * layout.position_map.line_height
4140                    - layout.position_map.scroll_pixel_position.y,
4141                lines: row_range
4142                    .iter_rows()
4143                    .map(|row| {
4144                        let line_layout =
4145                            &layout.position_map.line_layouts[row.minus(start_row) as usize];
4146                        HighlightedRangeLine {
4147                            start_x: if row == range.start.row() {
4148                                layout.content_origin.x
4149                                    + line_layout.x_for_index(range.start.column() as usize)
4150                                    - layout.position_map.scroll_pixel_position.x
4151                            } else {
4152                                layout.content_origin.x
4153                                    - layout.position_map.scroll_pixel_position.x
4154                            },
4155                            end_x: if row == range.end.row() {
4156                                layout.content_origin.x
4157                                    + line_layout.x_for_index(range.end.column() as usize)
4158                                    - layout.position_map.scroll_pixel_position.x
4159                            } else {
4160                                layout.content_origin.x + line_layout.width + line_end_overshoot
4161                                    - layout.position_map.scroll_pixel_position.x
4162                            },
4163                        }
4164                    })
4165                    .collect(),
4166            };
4167
4168            highlighted_range.paint(layout.text_hitbox.bounds, cx);
4169        }
4170    }
4171
4172    fn paint_inline_blame(&mut self, layout: &mut EditorLayout, cx: &mut WindowContext) {
4173        if let Some(mut inline_blame) = layout.inline_blame.take() {
4174            cx.paint_layer(layout.text_hitbox.bounds, |cx| {
4175                inline_blame.paint(cx);
4176            })
4177        }
4178    }
4179
4180    fn paint_blocks(&mut self, layout: &mut EditorLayout, cx: &mut WindowContext) {
4181        for mut block in layout.blocks.drain(..) {
4182            block.element.paint(cx);
4183        }
4184    }
4185
4186    fn paint_inline_completion_popover(
4187        &mut self,
4188        layout: &mut EditorLayout,
4189        cx: &mut WindowContext,
4190    ) {
4191        if let Some(inline_completion_popover) = layout.inline_completion_popover.as_mut() {
4192            inline_completion_popover.paint(cx);
4193        }
4194    }
4195
4196    fn paint_mouse_context_menu(&mut self, layout: &mut EditorLayout, cx: &mut WindowContext) {
4197        if let Some(mouse_context_menu) = layout.mouse_context_menu.as_mut() {
4198            mouse_context_menu.paint(cx);
4199        }
4200    }
4201
4202    fn paint_scroll_wheel_listener(&mut self, layout: &EditorLayout, cx: &mut WindowContext) {
4203        cx.on_mouse_event({
4204            let position_map = layout.position_map.clone();
4205            let editor = self.editor.clone();
4206            let hitbox = layout.hitbox.clone();
4207            let mut delta = ScrollDelta::default();
4208
4209            // Set a minimum scroll_sensitivity of 0.01 to make sure the user doesn't
4210            // accidentally turn off their scrolling.
4211            let scroll_sensitivity = EditorSettings::get_global(cx).scroll_sensitivity.max(0.01);
4212
4213            move |event: &ScrollWheelEvent, phase, cx| {
4214                if phase == DispatchPhase::Bubble && hitbox.is_hovered(cx) {
4215                    delta = delta.coalesce(event.delta);
4216                    editor.update(cx, |editor, cx| {
4217                        let position_map: &PositionMap = &position_map;
4218
4219                        let line_height = position_map.line_height;
4220                        let max_glyph_width = position_map.em_width;
4221                        let (delta, axis) = match delta {
4222                            gpui::ScrollDelta::Pixels(mut pixels) => {
4223                                //Trackpad
4224                                let axis = position_map.snapshot.ongoing_scroll.filter(&mut pixels);
4225                                (pixels, axis)
4226                            }
4227
4228                            gpui::ScrollDelta::Lines(lines) => {
4229                                //Not trackpad
4230                                let pixels =
4231                                    point(lines.x * max_glyph_width, lines.y * line_height);
4232                                (pixels, None)
4233                            }
4234                        };
4235
4236                        let current_scroll_position = position_map.snapshot.scroll_position();
4237                        let x = (current_scroll_position.x * max_glyph_width
4238                            - (delta.x * scroll_sensitivity))
4239                            / max_glyph_width;
4240                        let y = (current_scroll_position.y * line_height
4241                            - (delta.y * scroll_sensitivity))
4242                            / line_height;
4243                        let mut scroll_position =
4244                            point(x, y).clamp(&point(0., 0.), &position_map.scroll_max);
4245                        let forbid_vertical_scroll = editor.scroll_manager.forbid_vertical_scroll();
4246                        if forbid_vertical_scroll {
4247                            scroll_position.y = current_scroll_position.y;
4248                        }
4249
4250                        if scroll_position != current_scroll_position {
4251                            editor.scroll(scroll_position, axis, cx);
4252                            cx.stop_propagation();
4253                        } else if y < 0. {
4254                            // Due to clamping, we may fail to detect cases of overscroll to the top;
4255                            // We want the scroll manager to get an update in such cases and detect the change of direction
4256                            // on the next frame.
4257                            cx.notify();
4258                        }
4259                    });
4260                }
4261            }
4262        });
4263    }
4264
4265    fn paint_mouse_listeners(
4266        &mut self,
4267        layout: &EditorLayout,
4268        hovered_hunk: Option<HoveredHunk>,
4269        cx: &mut WindowContext,
4270    ) {
4271        self.paint_scroll_wheel_listener(layout, cx);
4272
4273        cx.on_mouse_event({
4274            let position_map = layout.position_map.clone();
4275            let editor = self.editor.clone();
4276            let text_hitbox = layout.text_hitbox.clone();
4277            let gutter_hitbox = layout.gutter_hitbox.clone();
4278
4279            move |event: &MouseDownEvent, phase, cx| {
4280                if phase == DispatchPhase::Bubble {
4281                    match event.button {
4282                        MouseButton::Left => editor.update(cx, |editor, cx| {
4283                            Self::mouse_left_down(
4284                                editor,
4285                                event,
4286                                hovered_hunk.clone(),
4287                                &position_map,
4288                                &text_hitbox,
4289                                &gutter_hitbox,
4290                                cx,
4291                            );
4292                        }),
4293                        MouseButton::Right => editor.update(cx, |editor, cx| {
4294                            Self::mouse_right_down(editor, event, &position_map, &text_hitbox, cx);
4295                        }),
4296                        MouseButton::Middle => editor.update(cx, |editor, cx| {
4297                            Self::mouse_middle_down(editor, event, &position_map, &text_hitbox, cx);
4298                        }),
4299                        _ => {}
4300                    };
4301                }
4302            }
4303        });
4304
4305        cx.on_mouse_event({
4306            let editor = self.editor.clone();
4307            let position_map = layout.position_map.clone();
4308            let text_hitbox = layout.text_hitbox.clone();
4309
4310            move |event: &MouseUpEvent, phase, cx| {
4311                if phase == DispatchPhase::Bubble {
4312                    editor.update(cx, |editor, cx| {
4313                        Self::mouse_up(editor, event, &position_map, &text_hitbox, cx)
4314                    });
4315                }
4316            }
4317        });
4318        cx.on_mouse_event({
4319            let position_map = layout.position_map.clone();
4320            let editor = self.editor.clone();
4321            let text_hitbox = layout.text_hitbox.clone();
4322            let gutter_hitbox = layout.gutter_hitbox.clone();
4323
4324            move |event: &MouseMoveEvent, phase, cx| {
4325                if phase == DispatchPhase::Bubble {
4326                    editor.update(cx, |editor, cx| {
4327                        if editor.hover_state.focused(cx) {
4328                            return;
4329                        }
4330                        if event.pressed_button == Some(MouseButton::Left)
4331                            || event.pressed_button == Some(MouseButton::Middle)
4332                        {
4333                            Self::mouse_dragged(
4334                                editor,
4335                                event,
4336                                &position_map,
4337                                text_hitbox.bounds,
4338                                cx,
4339                            )
4340                        }
4341
4342                        Self::mouse_moved(
4343                            editor,
4344                            event,
4345                            &position_map,
4346                            &text_hitbox,
4347                            &gutter_hitbox,
4348                            cx,
4349                        )
4350                    });
4351                }
4352            }
4353        });
4354    }
4355
4356    fn scrollbar_left(&self, bounds: &Bounds<Pixels>) -> Pixels {
4357        bounds.upper_right().x - self.style.scrollbar_width
4358    }
4359
4360    fn column_pixels(&self, column: usize, cx: &WindowContext) -> Pixels {
4361        let style = &self.style;
4362        let font_size = style.text.font_size.to_pixels(cx.rem_size());
4363        let layout = cx
4364            .text_system()
4365            .shape_line(
4366                SharedString::from(" ".repeat(column)),
4367                font_size,
4368                &[TextRun {
4369                    len: column,
4370                    font: style.text.font(),
4371                    color: Hsla::default(),
4372                    background_color: None,
4373                    underline: None,
4374                    strikethrough: None,
4375                }],
4376            )
4377            .unwrap();
4378
4379        layout.width
4380    }
4381
4382    fn max_line_number_width(&self, snapshot: &EditorSnapshot, cx: &WindowContext) -> Pixels {
4383        let digit_count = (snapshot.widest_line_number() as f32).log10().floor() as usize + 1;
4384        self.column_pixels(digit_count, cx)
4385    }
4386}
4387
4388fn jump_data(
4389    snapshot: &EditorSnapshot,
4390    block_row_start: DisplayRow,
4391    height: u32,
4392    for_excerpt: &ExcerptInfo,
4393    cx: &mut WindowContext<'_>,
4394) -> JumpData {
4395    let range = &for_excerpt.range;
4396    let buffer = &for_excerpt.buffer;
4397    let jump_path = project::File::from_dyn(buffer.file()).map(|file| ProjectPath {
4398        worktree_id: file.worktree_id(cx),
4399        path: file.path.clone(),
4400    });
4401    let jump_anchor = range
4402        .primary
4403        .as_ref()
4404        .map_or(range.context.start, |primary| primary.start);
4405
4406    let excerpt_start = range.context.start;
4407    let jump_position = language::ToPoint::to_point(&jump_anchor, buffer);
4408    let offset_from_excerpt_start = if jump_anchor == excerpt_start {
4409        0
4410    } else {
4411        let excerpt_start_row = language::ToPoint::to_point(&jump_anchor, buffer).row;
4412        jump_position.row - excerpt_start_row
4413    };
4414    let line_offset_from_top = block_row_start.0 + height + offset_from_excerpt_start
4415        - snapshot
4416            .scroll_anchor
4417            .scroll_position(&snapshot.display_snapshot)
4418            .y as u32;
4419    JumpData {
4420        excerpt_id: for_excerpt.id,
4421        anchor: jump_anchor,
4422        position: language::ToPoint::to_point(&jump_anchor, buffer),
4423        path: jump_path,
4424        line_offset_from_top,
4425    }
4426}
4427
4428fn inline_completion_popover_text(
4429    editor_snapshot: &EditorSnapshot,
4430    edits: &Vec<(Range<Anchor>, String)>,
4431    cx: &WindowContext,
4432) -> (String, Vec<(Range<usize>, HighlightStyle)>) {
4433    let edit_start = edits
4434        .first()
4435        .unwrap()
4436        .0
4437        .start
4438        .to_display_point(editor_snapshot);
4439
4440    let mut text = String::new();
4441    let mut offset = DisplayPoint::new(edit_start.row(), 0).to_offset(editor_snapshot, Bias::Left);
4442    let mut highlights = Vec::new();
4443    for (old_range, new_text) in edits {
4444        let old_offset_range = old_range.to_offset(&editor_snapshot.buffer_snapshot);
4445        text.extend(
4446            editor_snapshot
4447                .buffer_snapshot
4448                .chunks(offset..old_offset_range.start, false)
4449                .map(|chunk| chunk.text),
4450        );
4451        offset = old_offset_range.end;
4452
4453        let start = text.len();
4454        text.push_str(new_text);
4455        let end = text.len();
4456        highlights.push((
4457            start..end,
4458            HighlightStyle {
4459                background_color: Some(cx.theme().status().created_background),
4460                ..Default::default()
4461            },
4462        ));
4463    }
4464
4465    let edit_end = edits
4466        .last()
4467        .unwrap()
4468        .0
4469        .end
4470        .to_display_point(editor_snapshot);
4471    let end_of_line = DisplayPoint::new(edit_end.row(), editor_snapshot.line_len(edit_end.row()))
4472        .to_offset(editor_snapshot, Bias::Right);
4473    text.extend(
4474        editor_snapshot
4475            .buffer_snapshot
4476            .chunks(offset..end_of_line, false)
4477            .map(|chunk| chunk.text),
4478    );
4479
4480    (text, highlights)
4481}
4482
4483fn all_edits_insertions_or_deletions(
4484    edits: &Vec<(Range<Anchor>, String)>,
4485    snapshot: &MultiBufferSnapshot,
4486) -> bool {
4487    let mut all_insertions = true;
4488    let mut all_deletions = true;
4489
4490    for (range, new_text) in edits.iter() {
4491        let range_is_empty = range.to_offset(&snapshot).is_empty();
4492        let text_is_empty = new_text.is_empty();
4493
4494        if range_is_empty != text_is_empty {
4495            if range_is_empty {
4496                all_deletions = false;
4497            } else {
4498                all_insertions = false;
4499            }
4500        } else {
4501            return false;
4502        }
4503
4504        if !all_insertions && !all_deletions {
4505            return false;
4506        }
4507    }
4508    all_insertions || all_deletions
4509}
4510
4511#[allow(clippy::too_many_arguments)]
4512fn prepaint_gutter_button(
4513    button: IconButton,
4514    row: DisplayRow,
4515    line_height: Pixels,
4516    gutter_dimensions: &GutterDimensions,
4517    scroll_pixel_position: gpui::Point<Pixels>,
4518    gutter_hitbox: &Hitbox,
4519    rows_with_hunk_bounds: &HashMap<DisplayRow, Bounds<Pixels>>,
4520    cx: &mut WindowContext<'_>,
4521) -> AnyElement {
4522    let mut button = button.into_any_element();
4523    let available_space = size(
4524        AvailableSpace::MinContent,
4525        AvailableSpace::Definite(line_height),
4526    );
4527    let indicator_size = button.layout_as_root(available_space, cx);
4528
4529    let blame_width = gutter_dimensions.git_blame_entries_width;
4530    let gutter_width = rows_with_hunk_bounds
4531        .get(&row)
4532        .map(|bounds| bounds.size.width);
4533    let left_offset = blame_width.max(gutter_width).unwrap_or_default();
4534
4535    let mut x = left_offset;
4536    let available_width = gutter_dimensions.margin + gutter_dimensions.left_padding
4537        - indicator_size.width
4538        - left_offset;
4539    x += available_width / 2.;
4540
4541    let mut y = row.as_f32() * line_height - scroll_pixel_position.y;
4542    y += (line_height - indicator_size.height) / 2.;
4543
4544    button.prepaint_as_root(gutter_hitbox.origin + point(x, y), available_space, cx);
4545    button
4546}
4547
4548fn render_inline_blame_entry(
4549    blame: &gpui::Model<GitBlame>,
4550    blame_entry: BlameEntry,
4551    style: &EditorStyle,
4552    workspace: Option<WeakView<Workspace>>,
4553    cx: &mut WindowContext<'_>,
4554) -> AnyElement {
4555    let relative_timestamp = blame_entry_relative_timestamp(&blame_entry);
4556
4557    let author = blame_entry.author.as_deref().unwrap_or_default();
4558    let summary_enabled = ProjectSettings::get_global(cx)
4559        .git
4560        .show_inline_commit_summary();
4561
4562    let text = match blame_entry.summary.as_ref() {
4563        Some(summary) if summary_enabled => {
4564            format!("{}, {} - {}", author, relative_timestamp, summary)
4565        }
4566        _ => format!("{}, {}", author, relative_timestamp),
4567    };
4568
4569    let details = blame.read(cx).details_for_entry(&blame_entry);
4570
4571    let tooltip = cx.new_view(|_| BlameEntryTooltip::new(blame_entry, details, style, workspace));
4572
4573    h_flex()
4574        .id("inline-blame")
4575        .w_full()
4576        .font_family(style.text.font().family)
4577        .text_color(cx.theme().status().hint)
4578        .line_height(style.text.line_height)
4579        .child(Icon::new(IconName::FileGit).color(Color::Hint))
4580        .child(text)
4581        .gap_2()
4582        .hoverable_tooltip(move |_| tooltip.clone().into())
4583        .into_any()
4584}
4585
4586fn render_blame_entry(
4587    ix: usize,
4588    blame: &gpui::Model<GitBlame>,
4589    blame_entry: BlameEntry,
4590    style: &EditorStyle,
4591    last_used_color: &mut Option<(PlayerColor, Oid)>,
4592    editor: View<Editor>,
4593    cx: &mut WindowContext<'_>,
4594) -> AnyElement {
4595    let mut sha_color = cx
4596        .theme()
4597        .players()
4598        .color_for_participant(blame_entry.sha.into());
4599    // If the last color we used is the same as the one we get for this line, but
4600    // the commit SHAs are different, then we try again to get a different color.
4601    match *last_used_color {
4602        Some((color, sha)) if sha != blame_entry.sha && color.cursor == sha_color.cursor => {
4603            let index: u32 = blame_entry.sha.into();
4604            sha_color = cx.theme().players().color_for_participant(index + 1);
4605        }
4606        _ => {}
4607    };
4608    last_used_color.replace((sha_color, blame_entry.sha));
4609
4610    let relative_timestamp = blame_entry_relative_timestamp(&blame_entry);
4611
4612    let short_commit_id = blame_entry.sha.display_short();
4613
4614    let author_name = blame_entry.author.as_deref().unwrap_or("<no name>");
4615    let name = util::truncate_and_trailoff(author_name, GIT_BLAME_MAX_AUTHOR_CHARS_DISPLAYED);
4616
4617    let details = blame.read(cx).details_for_entry(&blame_entry);
4618
4619    let workspace = editor.read(cx).workspace.as_ref().map(|(w, _)| w.clone());
4620
4621    let tooltip = cx.new_view(|_| {
4622        BlameEntryTooltip::new(blame_entry.clone(), details.clone(), style, workspace)
4623    });
4624
4625    h_flex()
4626        .w_full()
4627        .justify_between()
4628        .font_family(style.text.font().family)
4629        .line_height(style.text.line_height)
4630        .id(("blame", ix))
4631        .text_color(cx.theme().status().hint)
4632        .pr_2()
4633        .gap_2()
4634        .child(
4635            h_flex()
4636                .items_center()
4637                .gap_2()
4638                .child(div().text_color(sha_color.cursor).child(short_commit_id))
4639                .child(name),
4640        )
4641        .child(relative_timestamp)
4642        .on_mouse_down(MouseButton::Right, {
4643            let blame_entry = blame_entry.clone();
4644            let details = details.clone();
4645            move |event, cx| {
4646                deploy_blame_entry_context_menu(
4647                    &blame_entry,
4648                    details.as_ref(),
4649                    editor.clone(),
4650                    event.position,
4651                    cx,
4652                );
4653            }
4654        })
4655        .hover(|style| style.bg(cx.theme().colors().element_hover))
4656        .when_some(
4657            details.and_then(|details| details.permalink),
4658            |this, url| {
4659                let url = url.clone();
4660                this.cursor_pointer().on_click(move |_, cx| {
4661                    cx.stop_propagation();
4662                    cx.open_url(url.as_str())
4663                })
4664            },
4665        )
4666        .hoverable_tooltip(move |_| tooltip.clone().into())
4667        .into_any()
4668}
4669
4670fn deploy_blame_entry_context_menu(
4671    blame_entry: &BlameEntry,
4672    details: Option<&CommitDetails>,
4673    editor: View<Editor>,
4674    position: gpui::Point<Pixels>,
4675    cx: &mut WindowContext<'_>,
4676) {
4677    let context_menu = ContextMenu::build(cx, move |menu, _| {
4678        let sha = format!("{}", blame_entry.sha);
4679        menu.on_blur_subscription(Subscription::new(|| {}))
4680            .entry("Copy commit SHA", None, move |cx| {
4681                cx.write_to_clipboard(ClipboardItem::new_string(sha.clone()));
4682            })
4683            .when_some(
4684                details.and_then(|details| details.permalink.clone()),
4685                |this, url| this.entry("Open permalink", None, move |cx| cx.open_url(url.as_str())),
4686            )
4687    });
4688
4689    editor.update(cx, move |editor, cx| {
4690        editor.mouse_context_menu = Some(MouseContextMenu::new(
4691            MenuPosition::PinnedToScreen(position),
4692            context_menu,
4693            cx,
4694        ));
4695        cx.notify();
4696    });
4697}
4698
4699#[derive(Debug)]
4700pub(crate) struct LineWithInvisibles {
4701    fragments: SmallVec<[LineFragment; 1]>,
4702    invisibles: Vec<Invisible>,
4703    len: usize,
4704    width: Pixels,
4705    font_size: Pixels,
4706}
4707
4708#[allow(clippy::large_enum_variant)]
4709enum LineFragment {
4710    Text(ShapedLine),
4711    Element {
4712        element: Option<AnyElement>,
4713        size: Size<Pixels>,
4714        len: usize,
4715    },
4716}
4717
4718impl fmt::Debug for LineFragment {
4719    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
4720        match self {
4721            LineFragment::Text(shaped_line) => f.debug_tuple("Text").field(shaped_line).finish(),
4722            LineFragment::Element { size, len, .. } => f
4723                .debug_struct("Element")
4724                .field("size", size)
4725                .field("len", len)
4726                .finish(),
4727        }
4728    }
4729}
4730
4731impl LineWithInvisibles {
4732    #[allow(clippy::too_many_arguments)]
4733    fn from_chunks<'a>(
4734        chunks: impl Iterator<Item = HighlightedChunk<'a>>,
4735        editor_style: &EditorStyle,
4736        max_line_len: usize,
4737        max_line_count: usize,
4738        editor_mode: EditorMode,
4739        text_width: Pixels,
4740        is_row_soft_wrapped: impl Copy + Fn(usize) -> bool,
4741        cx: &mut WindowContext,
4742    ) -> Vec<Self> {
4743        let text_style = &editor_style.text;
4744        let mut layouts = Vec::with_capacity(max_line_count);
4745        let mut fragments: SmallVec<[LineFragment; 1]> = SmallVec::new();
4746        let mut line = String::new();
4747        let mut invisibles = Vec::new();
4748        let mut width = Pixels::ZERO;
4749        let mut len = 0;
4750        let mut styles = Vec::new();
4751        let mut non_whitespace_added = false;
4752        let mut row = 0;
4753        let mut line_exceeded_max_len = false;
4754        let font_size = text_style.font_size.to_pixels(cx.rem_size());
4755
4756        let ellipsis = SharedString::from("⋯");
4757
4758        for highlighted_chunk in chunks.chain([HighlightedChunk {
4759            text: "\n",
4760            style: None,
4761            is_tab: false,
4762            replacement: None,
4763        }]) {
4764            if let Some(replacement) = highlighted_chunk.replacement {
4765                if !line.is_empty() {
4766                    let shaped_line = cx
4767                        .text_system()
4768                        .shape_line(line.clone().into(), font_size, &styles)
4769                        .unwrap();
4770                    width += shaped_line.width;
4771                    len += shaped_line.len;
4772                    fragments.push(LineFragment::Text(shaped_line));
4773                    line.clear();
4774                    styles.clear();
4775                }
4776
4777                match replacement {
4778                    ChunkReplacement::Renderer(renderer) => {
4779                        let available_width = if renderer.constrain_width {
4780                            let chunk = if highlighted_chunk.text == ellipsis.as_ref() {
4781                                ellipsis.clone()
4782                            } else {
4783                                SharedString::from(Arc::from(highlighted_chunk.text))
4784                            };
4785                            let shaped_line = cx
4786                                .text_system()
4787                                .shape_line(
4788                                    chunk,
4789                                    font_size,
4790                                    &[text_style.to_run(highlighted_chunk.text.len())],
4791                                )
4792                                .unwrap();
4793                            AvailableSpace::Definite(shaped_line.width)
4794                        } else {
4795                            AvailableSpace::MinContent
4796                        };
4797
4798                        let mut element = (renderer.render)(&mut ChunkRendererContext {
4799                            context: cx,
4800                            max_width: text_width,
4801                        });
4802                        let line_height = text_style.line_height_in_pixels(cx.rem_size());
4803                        let size = element.layout_as_root(
4804                            size(available_width, AvailableSpace::Definite(line_height)),
4805                            cx,
4806                        );
4807
4808                        width += size.width;
4809                        len += highlighted_chunk.text.len();
4810                        fragments.push(LineFragment::Element {
4811                            element: Some(element),
4812                            size,
4813                            len: highlighted_chunk.text.len(),
4814                        });
4815                    }
4816                    ChunkReplacement::Str(x) => {
4817                        let text_style = if let Some(style) = highlighted_chunk.style {
4818                            Cow::Owned(text_style.clone().highlight(style))
4819                        } else {
4820                            Cow::Borrowed(text_style)
4821                        };
4822
4823                        let run = TextRun {
4824                            len: x.len(),
4825                            font: text_style.font(),
4826                            color: text_style.color,
4827                            background_color: text_style.background_color,
4828                            underline: text_style.underline,
4829                            strikethrough: text_style.strikethrough,
4830                        };
4831                        let line_layout = cx
4832                            .text_system()
4833                            .shape_line(x, font_size, &[run])
4834                            .unwrap()
4835                            .with_len(highlighted_chunk.text.len());
4836
4837                        width += line_layout.width;
4838                        len += highlighted_chunk.text.len();
4839                        fragments.push(LineFragment::Text(line_layout))
4840                    }
4841                }
4842            } else {
4843                for (ix, mut line_chunk) in highlighted_chunk.text.split('\n').enumerate() {
4844                    if ix > 0 {
4845                        let shaped_line = cx
4846                            .text_system()
4847                            .shape_line(line.clone().into(), font_size, &styles)
4848                            .unwrap();
4849                        width += shaped_line.width;
4850                        len += shaped_line.len;
4851                        fragments.push(LineFragment::Text(shaped_line));
4852                        layouts.push(Self {
4853                            width: mem::take(&mut width),
4854                            len: mem::take(&mut len),
4855                            fragments: mem::take(&mut fragments),
4856                            invisibles: std::mem::take(&mut invisibles),
4857                            font_size,
4858                        });
4859
4860                        line.clear();
4861                        styles.clear();
4862                        row += 1;
4863                        line_exceeded_max_len = false;
4864                        non_whitespace_added = false;
4865                        if row == max_line_count {
4866                            return layouts;
4867                        }
4868                    }
4869
4870                    if !line_chunk.is_empty() && !line_exceeded_max_len {
4871                        let text_style = if let Some(style) = highlighted_chunk.style {
4872                            Cow::Owned(text_style.clone().highlight(style))
4873                        } else {
4874                            Cow::Borrowed(text_style)
4875                        };
4876
4877                        if line.len() + line_chunk.len() > max_line_len {
4878                            let mut chunk_len = max_line_len - line.len();
4879                            while !line_chunk.is_char_boundary(chunk_len) {
4880                                chunk_len -= 1;
4881                            }
4882                            line_chunk = &line_chunk[..chunk_len];
4883                            line_exceeded_max_len = true;
4884                        }
4885
4886                        styles.push(TextRun {
4887                            len: line_chunk.len(),
4888                            font: text_style.font(),
4889                            color: text_style.color,
4890                            background_color: text_style.background_color,
4891                            underline: text_style.underline,
4892                            strikethrough: text_style.strikethrough,
4893                        });
4894
4895                        if editor_mode == EditorMode::Full {
4896                            // Line wrap pads its contents with fake whitespaces,
4897                            // avoid printing them
4898                            let is_soft_wrapped = is_row_soft_wrapped(row);
4899                            if highlighted_chunk.is_tab {
4900                                if non_whitespace_added || !is_soft_wrapped {
4901                                    invisibles.push(Invisible::Tab {
4902                                        line_start_offset: line.len(),
4903                                        line_end_offset: line.len() + line_chunk.len(),
4904                                    });
4905                                }
4906                            } else {
4907                                invisibles.extend(
4908                                    line_chunk
4909                                        .bytes()
4910                                        .enumerate()
4911                                        .filter(|(_, line_byte)| {
4912                                            let is_whitespace =
4913                                                (*line_byte as char).is_whitespace();
4914                                            non_whitespace_added |= !is_whitespace;
4915                                            is_whitespace
4916                                                && (non_whitespace_added || !is_soft_wrapped)
4917                                        })
4918                                        .map(|(whitespace_index, _)| Invisible::Whitespace {
4919                                            line_offset: line.len() + whitespace_index,
4920                                        }),
4921                                )
4922                            }
4923                        }
4924
4925                        line.push_str(line_chunk);
4926                    }
4927                }
4928            }
4929        }
4930
4931        layouts
4932    }
4933
4934    fn prepaint(
4935        &mut self,
4936        line_height: Pixels,
4937        scroll_pixel_position: gpui::Point<Pixels>,
4938        row: DisplayRow,
4939        content_origin: gpui::Point<Pixels>,
4940        line_elements: &mut SmallVec<[AnyElement; 1]>,
4941        cx: &mut WindowContext,
4942    ) {
4943        let line_y = line_height * (row.as_f32() - scroll_pixel_position.y / line_height);
4944        let mut fragment_origin = content_origin + gpui::point(-scroll_pixel_position.x, line_y);
4945        for fragment in &mut self.fragments {
4946            match fragment {
4947                LineFragment::Text(line) => {
4948                    fragment_origin.x += line.width;
4949                }
4950                LineFragment::Element { element, size, .. } => {
4951                    let mut element = element
4952                        .take()
4953                        .expect("you can't prepaint LineWithInvisibles twice");
4954
4955                    // Center the element vertically within the line.
4956                    let mut element_origin = fragment_origin;
4957                    element_origin.y += (line_height - size.height) / 2.;
4958                    element.prepaint_at(element_origin, cx);
4959                    line_elements.push(element);
4960
4961                    fragment_origin.x += size.width;
4962                }
4963            }
4964        }
4965    }
4966
4967    fn draw(
4968        &self,
4969        layout: &EditorLayout,
4970        row: DisplayRow,
4971        content_origin: gpui::Point<Pixels>,
4972        whitespace_setting: ShowWhitespaceSetting,
4973        selection_ranges: &[Range<DisplayPoint>],
4974        cx: &mut WindowContext,
4975    ) {
4976        let line_height = layout.position_map.line_height;
4977        let line_y = line_height
4978            * (row.as_f32() - layout.position_map.scroll_pixel_position.y / line_height);
4979
4980        let mut fragment_origin =
4981            content_origin + gpui::point(-layout.position_map.scroll_pixel_position.x, line_y);
4982
4983        for fragment in &self.fragments {
4984            match fragment {
4985                LineFragment::Text(line) => {
4986                    line.paint(fragment_origin, line_height, cx).log_err();
4987                    fragment_origin.x += line.width;
4988                }
4989                LineFragment::Element { size, .. } => {
4990                    fragment_origin.x += size.width;
4991                }
4992            }
4993        }
4994
4995        self.draw_invisibles(
4996            selection_ranges,
4997            layout,
4998            content_origin,
4999            line_y,
5000            row,
5001            line_height,
5002            whitespace_setting,
5003            cx,
5004        );
5005    }
5006
5007    #[allow(clippy::too_many_arguments)]
5008    fn draw_invisibles(
5009        &self,
5010        selection_ranges: &[Range<DisplayPoint>],
5011        layout: &EditorLayout,
5012        content_origin: gpui::Point<Pixels>,
5013        line_y: Pixels,
5014        row: DisplayRow,
5015        line_height: Pixels,
5016        whitespace_setting: ShowWhitespaceSetting,
5017        cx: &mut WindowContext,
5018    ) {
5019        let extract_whitespace_info = |invisible: &Invisible| {
5020            let (token_offset, token_end_offset, invisible_symbol) = match invisible {
5021                Invisible::Tab {
5022                    line_start_offset,
5023                    line_end_offset,
5024                } => (*line_start_offset, *line_end_offset, &layout.tab_invisible),
5025                Invisible::Whitespace { line_offset } => {
5026                    (*line_offset, line_offset + 1, &layout.space_invisible)
5027                }
5028            };
5029
5030            let x_offset = self.x_for_index(token_offset);
5031            let invisible_offset =
5032                (layout.position_map.em_width - invisible_symbol.width).max(Pixels::ZERO) / 2.0;
5033            let origin = content_origin
5034                + gpui::point(
5035                    x_offset + invisible_offset - layout.position_map.scroll_pixel_position.x,
5036                    line_y,
5037                );
5038
5039            (
5040                [token_offset, token_end_offset],
5041                Box::new(move |cx: &mut WindowContext| {
5042                    invisible_symbol.paint(origin, line_height, cx).log_err();
5043                }),
5044            )
5045        };
5046
5047        let invisible_iter = self.invisibles.iter().map(extract_whitespace_info);
5048        match whitespace_setting {
5049            ShowWhitespaceSetting::None => (),
5050            ShowWhitespaceSetting::All => invisible_iter.for_each(|(_, paint)| paint(cx)),
5051            ShowWhitespaceSetting::Selection => invisible_iter.for_each(|([start, _], paint)| {
5052                let invisible_point = DisplayPoint::new(row, start as u32);
5053                if !selection_ranges
5054                    .iter()
5055                    .any(|region| region.start <= invisible_point && invisible_point < region.end)
5056                {
5057                    return;
5058                }
5059
5060                paint(cx);
5061            }),
5062
5063            // For a whitespace to be on a boundary, any of the following conditions need to be met:
5064            // - It is a tab
5065            // - It is adjacent to an edge (start or end)
5066            // - It is adjacent to a whitespace (left or right)
5067            ShowWhitespaceSetting::Boundary => {
5068                // We'll need to keep track of the last invisible we've seen and then check if we are adjacent to it for some of
5069                // the above cases.
5070                // Note: We zip in the original `invisibles` to check for tab equality
5071                let mut last_seen: Option<(bool, usize, Box<dyn Fn(&mut WindowContext)>)> = None;
5072                for (([start, end], paint), invisible) in
5073                    invisible_iter.zip_eq(self.invisibles.iter())
5074                {
5075                    let should_render = match (&last_seen, invisible) {
5076                        (_, Invisible::Tab { .. }) => true,
5077                        (Some((_, last_end, _)), _) => *last_end == start,
5078                        _ => false,
5079                    };
5080
5081                    if should_render || start == 0 || end == self.len {
5082                        paint(cx);
5083
5084                        // Since we are scanning from the left, we will skip over the first available whitespace that is part
5085                        // of a boundary between non-whitespace segments, so we correct by manually redrawing it if needed.
5086                        if let Some((should_render_last, last_end, paint_last)) = last_seen {
5087                            // Note that we need to make sure that the last one is actually adjacent
5088                            if !should_render_last && last_end == start {
5089                                paint_last(cx);
5090                            }
5091                        }
5092                    }
5093
5094                    // Manually render anything within a selection
5095                    let invisible_point = DisplayPoint::new(row, start as u32);
5096                    if selection_ranges.iter().any(|region| {
5097                        region.start <= invisible_point && invisible_point < region.end
5098                    }) {
5099                        paint(cx);
5100                    }
5101
5102                    last_seen = Some((should_render, end, paint));
5103                }
5104            }
5105        }
5106    }
5107
5108    pub fn x_for_index(&self, index: usize) -> Pixels {
5109        let mut fragment_start_x = Pixels::ZERO;
5110        let mut fragment_start_index = 0;
5111
5112        for fragment in &self.fragments {
5113            match fragment {
5114                LineFragment::Text(shaped_line) => {
5115                    let fragment_end_index = fragment_start_index + shaped_line.len;
5116                    if index < fragment_end_index {
5117                        return fragment_start_x
5118                            + shaped_line.x_for_index(index - fragment_start_index);
5119                    }
5120                    fragment_start_x += shaped_line.width;
5121                    fragment_start_index = fragment_end_index;
5122                }
5123                LineFragment::Element { len, size, .. } => {
5124                    let fragment_end_index = fragment_start_index + len;
5125                    if index < fragment_end_index {
5126                        return fragment_start_x;
5127                    }
5128                    fragment_start_x += size.width;
5129                    fragment_start_index = fragment_end_index;
5130                }
5131            }
5132        }
5133
5134        fragment_start_x
5135    }
5136
5137    pub fn index_for_x(&self, x: Pixels) -> Option<usize> {
5138        let mut fragment_start_x = Pixels::ZERO;
5139        let mut fragment_start_index = 0;
5140
5141        for fragment in &self.fragments {
5142            match fragment {
5143                LineFragment::Text(shaped_line) => {
5144                    let fragment_end_x = fragment_start_x + shaped_line.width;
5145                    if x < fragment_end_x {
5146                        return Some(
5147                            fragment_start_index + shaped_line.index_for_x(x - fragment_start_x)?,
5148                        );
5149                    }
5150                    fragment_start_x = fragment_end_x;
5151                    fragment_start_index += shaped_line.len;
5152                }
5153                LineFragment::Element { len, size, .. } => {
5154                    let fragment_end_x = fragment_start_x + size.width;
5155                    if x < fragment_end_x {
5156                        return Some(fragment_start_index);
5157                    }
5158                    fragment_start_index += len;
5159                    fragment_start_x = fragment_end_x;
5160                }
5161            }
5162        }
5163
5164        None
5165    }
5166
5167    pub fn font_id_for_index(&self, index: usize) -> Option<FontId> {
5168        let mut fragment_start_index = 0;
5169
5170        for fragment in &self.fragments {
5171            match fragment {
5172                LineFragment::Text(shaped_line) => {
5173                    let fragment_end_index = fragment_start_index + shaped_line.len;
5174                    if index < fragment_end_index {
5175                        return shaped_line.font_id_for_index(index - fragment_start_index);
5176                    }
5177                    fragment_start_index = fragment_end_index;
5178                }
5179                LineFragment::Element { len, .. } => {
5180                    let fragment_end_index = fragment_start_index + len;
5181                    if index < fragment_end_index {
5182                        return None;
5183                    }
5184                    fragment_start_index = fragment_end_index;
5185                }
5186            }
5187        }
5188
5189        None
5190    }
5191}
5192
5193#[derive(Debug, Clone, Copy, PartialEq, Eq)]
5194enum Invisible {
5195    /// A tab character
5196    ///
5197    /// A tab character is internally represented by spaces (configured by the user's tab width)
5198    /// aligned to the nearest column, so it's necessary to store the start and end offset for
5199    /// adjacency checks.
5200    Tab {
5201        line_start_offset: usize,
5202        line_end_offset: usize,
5203    },
5204    Whitespace {
5205        line_offset: usize,
5206    },
5207}
5208
5209impl EditorElement {
5210    /// Returns the rem size to use when rendering the [`EditorElement`].
5211    ///
5212    /// This allows UI elements to scale based on the `buffer_font_size`.
5213    fn rem_size(&self, cx: &WindowContext) -> Option<Pixels> {
5214        match self.editor.read(cx).mode {
5215            EditorMode::Full => {
5216                let buffer_font_size = self.style.text.font_size;
5217                match buffer_font_size {
5218                    AbsoluteLength::Pixels(pixels) => {
5219                        let rem_size_scale = {
5220                            // Our default UI font size is 14px on a 16px base scale.
5221                            // This means the default UI font size is 0.875rems.
5222                            let default_font_size_scale = 14. / ui::BASE_REM_SIZE_IN_PX;
5223
5224                            // We then determine the delta between a single rem and the default font
5225                            // size scale.
5226                            let default_font_size_delta = 1. - default_font_size_scale;
5227
5228                            // Finally, we add this delta to 1rem to get the scale factor that
5229                            // should be used to scale up the UI.
5230                            1. + default_font_size_delta
5231                        };
5232
5233                        Some(pixels * rem_size_scale)
5234                    }
5235                    AbsoluteLength::Rems(rems) => {
5236                        Some(rems.to_pixels(ui::BASE_REM_SIZE_IN_PX.into()))
5237                    }
5238                }
5239            }
5240            // We currently use single-line and auto-height editors in UI contexts,
5241            // so we don't want to scale everything with the buffer font size, as it
5242            // ends up looking off.
5243            EditorMode::SingleLine { .. } | EditorMode::AutoHeight { .. } => None,
5244        }
5245    }
5246}
5247
5248impl Element for EditorElement {
5249    type RequestLayoutState = ();
5250    type PrepaintState = EditorLayout;
5251
5252    fn id(&self) -> Option<ElementId> {
5253        None
5254    }
5255
5256    fn request_layout(
5257        &mut self,
5258        _: Option<&GlobalElementId>,
5259        cx: &mut WindowContext,
5260    ) -> (gpui::LayoutId, ()) {
5261        let rem_size = self.rem_size(cx);
5262        cx.with_rem_size(rem_size, |cx| {
5263            self.editor.update(cx, |editor, cx| {
5264                editor.set_style(self.style.clone(), cx);
5265
5266                let layout_id = match editor.mode {
5267                    EditorMode::SingleLine { auto_width } => {
5268                        let rem_size = cx.rem_size();
5269
5270                        let height = self.style.text.line_height_in_pixels(rem_size);
5271                        if auto_width {
5272                            let editor_handle = cx.view().clone();
5273                            let style = self.style.clone();
5274                            cx.request_measured_layout(Style::default(), move |_, _, cx| {
5275                                let editor_snapshot =
5276                                    editor_handle.update(cx, |editor, cx| editor.snapshot(cx));
5277                                let line = Self::layout_lines(
5278                                    DisplayRow(0)..DisplayRow(1),
5279                                    &editor_snapshot,
5280                                    &style,
5281                                    px(f32::MAX),
5282                                    |_| false, // Single lines never soft wrap
5283                                    cx,
5284                                )
5285                                .pop()
5286                                .unwrap();
5287
5288                                let font_id = cx.text_system().resolve_font(&style.text.font());
5289                                let font_size = style.text.font_size.to_pixels(cx.rem_size());
5290                                let em_width = cx
5291                                    .text_system()
5292                                    .typographic_bounds(font_id, font_size, 'm')
5293                                    .unwrap()
5294                                    .size
5295                                    .width;
5296
5297                                size(line.width + em_width, height)
5298                            })
5299                        } else {
5300                            let mut style = Style::default();
5301                            style.size.height = height.into();
5302                            style.size.width = relative(1.).into();
5303                            cx.request_layout(style, None)
5304                        }
5305                    }
5306                    EditorMode::AutoHeight { max_lines } => {
5307                        let editor_handle = cx.view().clone();
5308                        let max_line_number_width =
5309                            self.max_line_number_width(&editor.snapshot(cx), cx);
5310                        cx.request_measured_layout(
5311                            Style::default(),
5312                            move |known_dimensions, available_space, cx| {
5313                                editor_handle
5314                                    .update(cx, |editor, cx| {
5315                                        compute_auto_height_layout(
5316                                            editor,
5317                                            max_lines,
5318                                            max_line_number_width,
5319                                            known_dimensions,
5320                                            available_space.width,
5321                                            cx,
5322                                        )
5323                                    })
5324                                    .unwrap_or_default()
5325                            },
5326                        )
5327                    }
5328                    EditorMode::Full => {
5329                        let mut style = Style::default();
5330                        style.size.width = relative(1.).into();
5331                        style.size.height = relative(1.).into();
5332                        cx.request_layout(style, None)
5333                    }
5334                };
5335
5336                (layout_id, ())
5337            })
5338        })
5339    }
5340
5341    fn prepaint(
5342        &mut self,
5343        _: Option<&GlobalElementId>,
5344        bounds: Bounds<Pixels>,
5345        _: &mut Self::RequestLayoutState,
5346        cx: &mut WindowContext,
5347    ) -> Self::PrepaintState {
5348        let text_style = TextStyleRefinement {
5349            font_size: Some(self.style.text.font_size),
5350            line_height: Some(self.style.text.line_height),
5351            ..Default::default()
5352        };
5353        let focus_handle = self.editor.focus_handle(cx);
5354        cx.set_view_id(self.editor.entity_id());
5355        cx.set_focus_handle(&focus_handle);
5356
5357        let rem_size = self.rem_size(cx);
5358        cx.with_rem_size(rem_size, |cx| {
5359            cx.with_text_style(Some(text_style), |cx| {
5360                cx.with_content_mask(Some(ContentMask { bounds }), |cx| {
5361                    let mut snapshot = self.editor.update(cx, |editor, cx| editor.snapshot(cx));
5362                    let style = self.style.clone();
5363
5364                    let font_id = cx.text_system().resolve_font(&style.text.font());
5365                    let font_size = style.text.font_size.to_pixels(cx.rem_size());
5366                    let line_height = style.text.line_height_in_pixels(cx.rem_size());
5367                    let em_width = cx
5368                        .text_system()
5369                        .typographic_bounds(font_id, font_size, 'm')
5370                        .unwrap()
5371                        .size
5372                        .width;
5373                    let em_advance = cx
5374                        .text_system()
5375                        .advance(font_id, font_size, 'm')
5376                        .unwrap()
5377                        .width;
5378
5379                    let gutter_dimensions = snapshot.gutter_dimensions(
5380                        font_id,
5381                        font_size,
5382                        em_width,
5383                        em_advance,
5384                        self.max_line_number_width(&snapshot, cx),
5385                        cx,
5386                    );
5387                    let text_width = bounds.size.width - gutter_dimensions.width;
5388
5389                    let right_margin = if snapshot.mode == EditorMode::Full {
5390                        EditorElement::SCROLLBAR_WIDTH
5391                    } else {
5392                        px(0.)
5393                    };
5394                    let overscroll = size(em_width + right_margin, px(0.));
5395
5396                    let editor_width =
5397                        text_width - gutter_dimensions.margin - overscroll.width - em_width;
5398
5399                    snapshot = self.editor.update(cx, |editor, cx| {
5400                        editor.last_bounds = Some(bounds);
5401                        editor.gutter_dimensions = gutter_dimensions;
5402                        editor.set_visible_line_count(bounds.size.height / line_height, cx);
5403
5404                        if matches!(editor.mode, EditorMode::AutoHeight { .. }) {
5405                            snapshot
5406                        } else {
5407                            let wrap_width = match editor.soft_wrap_mode(cx) {
5408                                SoftWrap::GitDiff => None,
5409                                SoftWrap::None => Some((MAX_LINE_LEN / 2) as f32 * em_advance),
5410                                SoftWrap::EditorWidth => Some(editor_width),
5411                                SoftWrap::Column(column) => Some(column as f32 * em_advance),
5412                                SoftWrap::Bounded(column) => {
5413                                    Some(editor_width.min(column as f32 * em_advance))
5414                                }
5415                            };
5416
5417                            if editor.set_wrap_width(wrap_width, cx) {
5418                                editor.snapshot(cx)
5419                            } else {
5420                                snapshot
5421                            }
5422                        }
5423                    });
5424
5425                    let wrap_guides = self
5426                        .editor
5427                        .read(cx)
5428                        .wrap_guides(cx)
5429                        .iter()
5430                        .map(|(guide, active)| (self.column_pixels(*guide, cx), *active))
5431                        .collect::<SmallVec<[_; 2]>>();
5432
5433                    let hitbox = cx.insert_hitbox(bounds, false);
5434                    let gutter_hitbox =
5435                        cx.insert_hitbox(gutter_bounds(bounds, gutter_dimensions), false);
5436                    let text_hitbox = cx.insert_hitbox(
5437                        Bounds {
5438                            origin: gutter_hitbox.upper_right(),
5439                            size: size(text_width, bounds.size.height),
5440                        },
5441                        false,
5442                    );
5443                    // Offset the content_bounds from the text_bounds by the gutter margin (which
5444                    // is roughly half a character wide) to make hit testing work more like how we want.
5445                    let content_origin =
5446                        text_hitbox.origin + point(gutter_dimensions.margin, Pixels::ZERO);
5447
5448                    let height_in_lines = bounds.size.height / line_height;
5449                    let max_row = snapshot.max_point().row().as_f32();
5450                    let max_scroll_top = if matches!(snapshot.mode, EditorMode::AutoHeight { .. }) {
5451                        (max_row - height_in_lines + 1.).max(0.)
5452                    } else {
5453                        let settings = EditorSettings::get_global(cx);
5454                        match settings.scroll_beyond_last_line {
5455                            ScrollBeyondLastLine::OnePage => max_row,
5456                            ScrollBeyondLastLine::Off => (max_row - height_in_lines + 1.).max(0.),
5457                            ScrollBeyondLastLine::VerticalScrollMargin => {
5458                                (max_row - height_in_lines + 1. + settings.vertical_scroll_margin)
5459                                    .max(0.)
5460                            }
5461                        }
5462                    };
5463
5464                    let mut autoscroll_request = None;
5465                    let mut autoscroll_containing_element = false;
5466                    let mut autoscroll_horizontally = false;
5467                    self.editor.update(cx, |editor, cx| {
5468                        autoscroll_request = editor.autoscroll_request();
5469                        autoscroll_containing_element =
5470                            autoscroll_request.is_some() || editor.has_pending_selection();
5471                        autoscroll_horizontally =
5472                            editor.autoscroll_vertically(bounds, line_height, max_scroll_top, cx);
5473                        snapshot = editor.snapshot(cx);
5474                    });
5475
5476                    let mut scroll_position = snapshot.scroll_position();
5477                    // The scroll position is a fractional point, the whole number of which represents
5478                    // the top of the window in terms of display rows.
5479                    let start_row = DisplayRow(scroll_position.y as u32);
5480                    let max_row = snapshot.max_point().row();
5481                    let end_row = cmp::min(
5482                        (scroll_position.y + height_in_lines).ceil() as u32,
5483                        max_row.next_row().0,
5484                    );
5485                    let end_row = DisplayRow(end_row);
5486
5487                    let buffer_rows = snapshot
5488                        .buffer_rows(start_row)
5489                        .take((start_row..end_row).len())
5490                        .collect::<Vec<_>>();
5491                    let is_row_soft_wrapped =
5492                        |row| buffer_rows.get(row).copied().flatten().is_none();
5493
5494                    let start_anchor = if start_row == Default::default() {
5495                        Anchor::min()
5496                    } else {
5497                        snapshot.buffer_snapshot.anchor_before(
5498                            DisplayPoint::new(start_row, 0).to_offset(&snapshot, Bias::Left),
5499                        )
5500                    };
5501                    let end_anchor = if end_row > max_row {
5502                        Anchor::max()
5503                    } else {
5504                        snapshot.buffer_snapshot.anchor_before(
5505                            DisplayPoint::new(end_row, 0).to_offset(&snapshot, Bias::Right),
5506                        )
5507                    };
5508
5509                    let highlighted_rows = self
5510                        .editor
5511                        .update(cx, |editor, cx| editor.highlighted_display_rows(cx));
5512                    let highlighted_ranges = self.editor.read(cx).background_highlights_in_range(
5513                        start_anchor..end_anchor,
5514                        &snapshot.display_snapshot,
5515                        cx.theme().colors(),
5516                    );
5517                    let highlighted_gutter_ranges =
5518                        self.editor.read(cx).gutter_highlights_in_range(
5519                            start_anchor..end_anchor,
5520                            &snapshot.display_snapshot,
5521                            cx,
5522                        );
5523
5524                    let redacted_ranges = self.editor.read(cx).redacted_ranges(
5525                        start_anchor..end_anchor,
5526                        &snapshot.display_snapshot,
5527                        cx,
5528                    );
5529
5530                    let local_selections: Vec<Selection<Point>> =
5531                        self.editor.update(cx, |editor, cx| {
5532                            let mut selections = editor
5533                                .selections
5534                                .disjoint_in_range(start_anchor..end_anchor, cx);
5535                            selections.extend(editor.selections.pending(cx));
5536                            selections
5537                        });
5538
5539                    let (selections, active_rows, newest_selection_head) = self.layout_selections(
5540                        start_anchor,
5541                        end_anchor,
5542                        &local_selections,
5543                        &snapshot,
5544                        start_row,
5545                        end_row,
5546                        cx,
5547                    );
5548
5549                    let line_numbers = self.layout_line_numbers(
5550                        start_row..end_row,
5551                        buffer_rows.iter().copied(),
5552                        &active_rows,
5553                        newest_selection_head,
5554                        &snapshot,
5555                        cx,
5556                    );
5557
5558                    let mut crease_toggles = cx.with_element_namespace("crease_toggles", |cx| {
5559                        self.layout_crease_toggles(
5560                            start_row..end_row,
5561                            buffer_rows.iter().copied(),
5562                            &active_rows,
5563                            &snapshot,
5564                            cx,
5565                        )
5566                    });
5567                    let crease_trailers = cx.with_element_namespace("crease_trailers", |cx| {
5568                        self.layout_crease_trailers(buffer_rows.iter().copied(), &snapshot, cx)
5569                    });
5570
5571                    let display_hunks = self.layout_gutter_git_hunks(
5572                        line_height,
5573                        &gutter_hitbox,
5574                        start_row..end_row,
5575                        start_anchor..end_anchor,
5576                        &snapshot,
5577                        cx,
5578                    );
5579
5580                    let mut max_visible_line_width = Pixels::ZERO;
5581                    let mut line_layouts = Self::layout_lines(
5582                        start_row..end_row,
5583                        &snapshot,
5584                        &self.style,
5585                        editor_width,
5586                        is_row_soft_wrapped,
5587                        cx,
5588                    );
5589                    for line_with_invisibles in &line_layouts {
5590                        if line_with_invisibles.width > max_visible_line_width {
5591                            max_visible_line_width = line_with_invisibles.width;
5592                        }
5593                    }
5594
5595                    let longest_line_width = layout_line(
5596                        snapshot.longest_row(),
5597                        &snapshot,
5598                        &style,
5599                        editor_width,
5600                        is_row_soft_wrapped,
5601                        cx,
5602                    )
5603                    .width;
5604                    let mut scroll_width =
5605                        longest_line_width.max(max_visible_line_width) + overscroll.width;
5606
5607                    let blocks = cx.with_element_namespace("blocks", |cx| {
5608                        self.render_blocks(
5609                            start_row..end_row,
5610                            &snapshot,
5611                            &hitbox,
5612                            &text_hitbox,
5613                            editor_width,
5614                            &mut scroll_width,
5615                            &gutter_dimensions,
5616                            em_width,
5617                            gutter_dimensions.full_width(),
5618                            line_height,
5619                            &line_layouts,
5620                            &local_selections,
5621                            is_row_soft_wrapped,
5622                            cx,
5623                        )
5624                    });
5625                    let mut blocks = match blocks {
5626                        Ok(blocks) => blocks,
5627                        Err(resized_blocks) => {
5628                            self.editor.update(cx, |editor, cx| {
5629                                editor.resize_blocks(resized_blocks, autoscroll_request, cx)
5630                            });
5631                            return self.prepaint(None, bounds, &mut (), cx);
5632                        }
5633                    };
5634
5635                    let start_buffer_row =
5636                        MultiBufferRow(start_anchor.to_point(&snapshot.buffer_snapshot).row);
5637                    let end_buffer_row =
5638                        MultiBufferRow(end_anchor.to_point(&snapshot.buffer_snapshot).row);
5639
5640                    let scroll_max = point(
5641                        ((scroll_width - text_hitbox.size.width) / em_width).max(0.0),
5642                        max_row.as_f32(),
5643                    );
5644
5645                    self.editor.update(cx, |editor, cx| {
5646                        let clamped = editor.scroll_manager.clamp_scroll_left(scroll_max.x);
5647
5648                        let autoscrolled = if autoscroll_horizontally {
5649                            editor.autoscroll_horizontally(
5650                                start_row,
5651                                text_hitbox.size.width,
5652                                scroll_width,
5653                                em_width,
5654                                &line_layouts,
5655                                cx,
5656                            )
5657                        } else {
5658                            false
5659                        };
5660
5661                        if clamped || autoscrolled {
5662                            snapshot = editor.snapshot(cx);
5663                            scroll_position = snapshot.scroll_position();
5664                        }
5665                    });
5666
5667                    let scroll_pixel_position = point(
5668                        scroll_position.x * em_width,
5669                        scroll_position.y * line_height,
5670                    );
5671
5672                    let indent_guides = self.layout_indent_guides(
5673                        content_origin,
5674                        text_hitbox.origin,
5675                        start_buffer_row..end_buffer_row,
5676                        scroll_pixel_position,
5677                        line_height,
5678                        &snapshot,
5679                        cx,
5680                    );
5681
5682                    let crease_trailers = cx.with_element_namespace("crease_trailers", |cx| {
5683                        self.prepaint_crease_trailers(
5684                            crease_trailers,
5685                            &line_layouts,
5686                            line_height,
5687                            content_origin,
5688                            scroll_pixel_position,
5689                            em_width,
5690                            cx,
5691                        )
5692                    });
5693
5694                    let mut inline_blame = None;
5695                    if let Some(newest_selection_head) = newest_selection_head {
5696                        let display_row = newest_selection_head.row();
5697                        if (start_row..end_row).contains(&display_row) {
5698                            let line_ix = display_row.minus(start_row) as usize;
5699                            let line_layout = &line_layouts[line_ix];
5700                            let crease_trailer_layout = crease_trailers[line_ix].as_ref();
5701                            inline_blame = self.layout_inline_blame(
5702                                display_row,
5703                                &snapshot.display_snapshot,
5704                                line_layout,
5705                                crease_trailer_layout,
5706                                em_width,
5707                                content_origin,
5708                                scroll_pixel_position,
5709                                line_height,
5710                                cx,
5711                            );
5712                        }
5713                    }
5714
5715                    let blamed_display_rows = self.layout_blame_entries(
5716                        buffer_rows.into_iter(),
5717                        em_width,
5718                        scroll_position,
5719                        line_height,
5720                        &gutter_hitbox,
5721                        gutter_dimensions.git_blame_entries_width,
5722                        cx,
5723                    );
5724
5725                    let scroll_max = point(
5726                        ((scroll_width - text_hitbox.size.width) / em_width).max(0.0),
5727                        max_scroll_top,
5728                    );
5729
5730                    self.editor.update(cx, |editor, cx| {
5731                        let clamped = editor.scroll_manager.clamp_scroll_left(scroll_max.x);
5732
5733                        let autoscrolled = if autoscroll_horizontally {
5734                            editor.autoscroll_horizontally(
5735                                start_row,
5736                                text_hitbox.size.width,
5737                                scroll_width,
5738                                em_width,
5739                                &line_layouts,
5740                                cx,
5741                            )
5742                        } else {
5743                            false
5744                        };
5745
5746                        if clamped || autoscrolled {
5747                            snapshot = editor.snapshot(cx);
5748                            scroll_position = snapshot.scroll_position();
5749                        }
5750                    });
5751
5752                    let line_elements = self.prepaint_lines(
5753                        start_row,
5754                        &mut line_layouts,
5755                        line_height,
5756                        scroll_pixel_position,
5757                        content_origin,
5758                        cx,
5759                    );
5760
5761                    let mut block_start_rows = HashSet::default();
5762                    cx.with_element_namespace("blocks", |cx| {
5763                        self.layout_blocks(
5764                            &mut blocks,
5765                            &mut block_start_rows,
5766                            &hitbox,
5767                            line_height,
5768                            scroll_pixel_position,
5769                            cx,
5770                        );
5771                    });
5772
5773                    let cursors = self.collect_cursors(&snapshot, cx);
5774                    let visible_row_range = start_row..end_row;
5775                    let non_visible_cursors = cursors
5776                        .iter()
5777                        .any(move |c| !visible_row_range.contains(&c.0.row()));
5778
5779                    let visible_cursors = self.layout_visible_cursors(
5780                        &snapshot,
5781                        &selections,
5782                        &block_start_rows,
5783                        start_row..end_row,
5784                        &line_layouts,
5785                        &text_hitbox,
5786                        content_origin,
5787                        scroll_position,
5788                        scroll_pixel_position,
5789                        line_height,
5790                        em_width,
5791                        autoscroll_containing_element,
5792                        cx,
5793                    );
5794
5795                    let scrollbar_layout = self.layout_scrollbar(
5796                        &snapshot,
5797                        bounds,
5798                        scroll_position,
5799                        height_in_lines,
5800                        non_visible_cursors,
5801                        cx,
5802                    );
5803
5804                    let gutter_settings = EditorSettings::get_global(cx).gutter;
5805
5806                    let expanded_add_hunks_by_rows = self.editor.update(cx, |editor, _| {
5807                        editor
5808                            .diff_map
5809                            .hunks(false)
5810                            .filter(|hunk| hunk.status == DiffHunkStatus::Added)
5811                            .map(|expanded_hunk| {
5812                                let start_row = expanded_hunk
5813                                    .hunk_range
5814                                    .start
5815                                    .to_display_point(&snapshot)
5816                                    .row();
5817                                (start_row, expanded_hunk.clone())
5818                            })
5819                            .collect::<HashMap<_, _>>()
5820                    });
5821
5822                    let rows_with_hunk_bounds = display_hunks
5823                        .iter()
5824                        .filter_map(|(hunk, hitbox)| Some((hunk, hitbox.as_ref()?.bounds)))
5825                        .fold(
5826                            HashMap::default(),
5827                            |mut rows_with_hunk_bounds, (hunk, bounds)| {
5828                                match hunk {
5829                                    DisplayDiffHunk::Folded { display_row } => {
5830                                        rows_with_hunk_bounds.insert(*display_row, bounds);
5831                                    }
5832                                    DisplayDiffHunk::Unfolded {
5833                                        display_row_range, ..
5834                                    } => {
5835                                        for display_row in display_row_range.iter_rows() {
5836                                            rows_with_hunk_bounds.insert(display_row, bounds);
5837                                        }
5838                                    }
5839                                }
5840                                rows_with_hunk_bounds
5841                            },
5842                        );
5843                    let mut _context_menu_visible = false;
5844                    let mut code_actions_indicator = None;
5845                    if let Some(newest_selection_head) = newest_selection_head {
5846                        if (start_row..end_row).contains(&newest_selection_head.row()) {
5847                            _context_menu_visible = self.layout_context_menu(
5848                                line_height,
5849                                &hitbox,
5850                                &text_hitbox,
5851                                content_origin,
5852                                start_row,
5853                                scroll_pixel_position,
5854                                &line_layouts,
5855                                newest_selection_head,
5856                                gutter_dimensions.width - gutter_dimensions.left_padding,
5857                                cx,
5858                            );
5859
5860                            let show_code_actions = snapshot
5861                                .show_code_actions
5862                                .unwrap_or(gutter_settings.code_actions);
5863                            if show_code_actions {
5864                                let newest_selection_point =
5865                                    newest_selection_head.to_point(&snapshot.display_snapshot);
5866                                let newest_selection_display_row =
5867                                    newest_selection_point.to_display_point(&snapshot).row();
5868                                if !expanded_add_hunks_by_rows
5869                                    .contains_key(&newest_selection_display_row)
5870                                {
5871                                    if !snapshot
5872                                        .is_line_folded(MultiBufferRow(newest_selection_point.row))
5873                                    {
5874                                        let buffer = snapshot.buffer_snapshot.buffer_line_for_row(
5875                                            MultiBufferRow(newest_selection_point.row),
5876                                        );
5877                                        if let Some((buffer, range)) = buffer {
5878                                            let buffer_id = buffer.remote_id();
5879                                            let row = range.start.row;
5880                                            let has_test_indicator = self
5881                                                .editor
5882                                                .read(cx)
5883                                                .tasks
5884                                                .contains_key(&(buffer_id, row));
5885
5886                                            if !has_test_indicator {
5887                                                code_actions_indicator = self
5888                                                    .layout_code_actions_indicator(
5889                                                        line_height,
5890                                                        newest_selection_head,
5891                                                        scroll_pixel_position,
5892                                                        &gutter_dimensions,
5893                                                        &gutter_hitbox,
5894                                                        &rows_with_hunk_bounds,
5895                                                        cx,
5896                                                    );
5897                                            }
5898                                        }
5899                                    }
5900                                }
5901                            }
5902                        }
5903                    }
5904
5905                    let test_indicators = if gutter_settings.runnables {
5906                        self.layout_run_indicators(
5907                            line_height,
5908                            start_row..end_row,
5909                            scroll_pixel_position,
5910                            &gutter_dimensions,
5911                            &gutter_hitbox,
5912                            &rows_with_hunk_bounds,
5913                            &snapshot,
5914                            cx,
5915                        )
5916                    } else {
5917                        Vec::new()
5918                    };
5919
5920                    self.layout_signature_help(
5921                        &hitbox,
5922                        content_origin,
5923                        scroll_pixel_position,
5924                        newest_selection_head,
5925                        start_row,
5926                        &line_layouts,
5927                        line_height,
5928                        em_width,
5929                        cx,
5930                    );
5931
5932                    if !cx.has_active_drag() {
5933                        self.layout_hover_popovers(
5934                            &snapshot,
5935                            &hitbox,
5936                            &text_hitbox,
5937                            start_row..end_row,
5938                            content_origin,
5939                            scroll_pixel_position,
5940                            &line_layouts,
5941                            line_height,
5942                            em_width,
5943                            cx,
5944                        );
5945                    }
5946
5947                    let inline_completion_popover = self.layout_inline_completion_popover(
5948                        &text_hitbox.bounds,
5949                        &snapshot,
5950                        start_row..end_row,
5951                        scroll_position.y,
5952                        scroll_position.y + height_in_lines,
5953                        &line_layouts,
5954                        line_height,
5955                        scroll_pixel_position,
5956                        editor_width,
5957                        &style,
5958                        cx,
5959                    );
5960
5961                    let mouse_context_menu = self.layout_mouse_context_menu(
5962                        &snapshot,
5963                        start_row..end_row,
5964                        content_origin,
5965                        cx,
5966                    );
5967
5968                    cx.with_element_namespace("crease_toggles", |cx| {
5969                        self.prepaint_crease_toggles(
5970                            &mut crease_toggles,
5971                            line_height,
5972                            &gutter_dimensions,
5973                            gutter_settings,
5974                            scroll_pixel_position,
5975                            &gutter_hitbox,
5976                            cx,
5977                        )
5978                    });
5979
5980                    let invisible_symbol_font_size = font_size / 2.;
5981                    let tab_invisible = cx
5982                        .text_system()
5983                        .shape_line(
5984                            "→".into(),
5985                            invisible_symbol_font_size,
5986                            &[TextRun {
5987                                len: "→".len(),
5988                                font: self.style.text.font(),
5989                                color: cx.theme().colors().editor_invisible,
5990                                background_color: None,
5991                                underline: None,
5992                                strikethrough: None,
5993                            }],
5994                        )
5995                        .unwrap();
5996                    let space_invisible = cx
5997                        .text_system()
5998                        .shape_line(
5999                            "•".into(),
6000                            invisible_symbol_font_size,
6001                            &[TextRun {
6002                                len: "•".len(),
6003                                font: self.style.text.font(),
6004                                color: cx.theme().colors().editor_invisible,
6005                                background_color: None,
6006                                underline: None,
6007                                strikethrough: None,
6008                            }],
6009                        )
6010                        .unwrap();
6011
6012                    EditorLayout {
6013                        mode: snapshot.mode,
6014                        position_map: Rc::new(PositionMap {
6015                            size: bounds.size,
6016                            scroll_pixel_position,
6017                            scroll_max,
6018                            line_layouts,
6019                            line_height,
6020                            em_width,
6021                            em_advance,
6022                            snapshot,
6023                        }),
6024                        visible_display_row_range: start_row..end_row,
6025                        wrap_guides,
6026                        indent_guides,
6027                        hitbox,
6028                        text_hitbox,
6029                        gutter_hitbox,
6030                        gutter_dimensions,
6031                        display_hunks,
6032                        content_origin,
6033                        scrollbar_layout,
6034                        active_rows,
6035                        highlighted_rows,
6036                        highlighted_ranges,
6037                        highlighted_gutter_ranges,
6038                        redacted_ranges,
6039                        line_elements,
6040                        line_numbers,
6041                        blamed_display_rows,
6042                        inline_blame,
6043                        blocks,
6044                        cursors,
6045                        visible_cursors,
6046                        selections,
6047                        inline_completion_popover,
6048                        mouse_context_menu,
6049                        test_indicators,
6050                        code_actions_indicator,
6051                        crease_toggles,
6052                        crease_trailers,
6053                        tab_invisible,
6054                        space_invisible,
6055                    }
6056                })
6057            })
6058        })
6059    }
6060
6061    fn paint(
6062        &mut self,
6063        _: Option<&GlobalElementId>,
6064        bounds: Bounds<gpui::Pixels>,
6065        _: &mut Self::RequestLayoutState,
6066        layout: &mut Self::PrepaintState,
6067        cx: &mut WindowContext,
6068    ) {
6069        let focus_handle = self.editor.focus_handle(cx);
6070        let key_context = self.editor.update(cx, |editor, cx| editor.key_context(cx));
6071        cx.set_key_context(key_context);
6072        cx.handle_input(
6073            &focus_handle,
6074            ElementInputHandler::new(bounds, self.editor.clone()),
6075        );
6076        self.register_actions(cx);
6077        self.register_key_listeners(cx, layout);
6078
6079        let text_style = TextStyleRefinement {
6080            font_size: Some(self.style.text.font_size),
6081            line_height: Some(self.style.text.line_height),
6082            ..Default::default()
6083        };
6084        let hovered_hunk = layout
6085            .display_hunks
6086            .iter()
6087            .find_map(|(hunk, hunk_hitbox)| match hunk {
6088                DisplayDiffHunk::Folded { .. } => None,
6089                DisplayDiffHunk::Unfolded {
6090                    diff_base_byte_range,
6091                    multi_buffer_range,
6092                    status,
6093                    ..
6094                } => {
6095                    if hunk_hitbox
6096                        .as_ref()
6097                        .map(|hitbox| hitbox.is_hovered(cx))
6098                        .unwrap_or(false)
6099                    {
6100                        Some(HoveredHunk {
6101                            status: *status,
6102                            multi_buffer_range: multi_buffer_range.clone(),
6103                            diff_base_byte_range: diff_base_byte_range.clone(),
6104                        })
6105                    } else {
6106                        None
6107                    }
6108                }
6109            });
6110        let rem_size = self.rem_size(cx);
6111        cx.with_rem_size(rem_size, |cx| {
6112            cx.with_text_style(Some(text_style), |cx| {
6113                cx.with_content_mask(Some(ContentMask { bounds }), |cx| {
6114                    self.paint_mouse_listeners(layout, hovered_hunk, cx);
6115                    self.paint_background(layout, cx);
6116                    self.paint_indent_guides(layout, cx);
6117
6118                    if layout.gutter_hitbox.size.width > Pixels::ZERO {
6119                        self.paint_blamed_display_rows(layout, cx);
6120                        self.paint_line_numbers(layout, cx);
6121                    }
6122
6123                    self.paint_text(layout, cx);
6124
6125                    if layout.gutter_hitbox.size.width > Pixels::ZERO {
6126                        self.paint_gutter_highlights(layout, cx);
6127                        self.paint_gutter_indicators(layout, cx);
6128                    }
6129
6130                    if !layout.blocks.is_empty() {
6131                        cx.with_element_namespace("blocks", |cx| {
6132                            self.paint_blocks(layout, cx);
6133                        });
6134                    }
6135
6136                    self.paint_scrollbar(layout, cx);
6137                    self.paint_inline_completion_popover(layout, cx);
6138                    self.paint_mouse_context_menu(layout, cx);
6139                });
6140            })
6141        })
6142    }
6143}
6144
6145pub(super) fn gutter_bounds(
6146    editor_bounds: Bounds<Pixels>,
6147    gutter_dimensions: GutterDimensions,
6148) -> Bounds<Pixels> {
6149    Bounds {
6150        origin: editor_bounds.origin,
6151        size: size(gutter_dimensions.width, editor_bounds.size.height),
6152    }
6153}
6154
6155impl IntoElement for EditorElement {
6156    type Element = Self;
6157
6158    fn into_element(self) -> Self::Element {
6159        self
6160    }
6161}
6162
6163pub struct EditorLayout {
6164    position_map: Rc<PositionMap>,
6165    hitbox: Hitbox,
6166    text_hitbox: Hitbox,
6167    gutter_hitbox: Hitbox,
6168    gutter_dimensions: GutterDimensions,
6169    content_origin: gpui::Point<Pixels>,
6170    scrollbar_layout: Option<ScrollbarLayout>,
6171    mode: EditorMode,
6172    wrap_guides: SmallVec<[(Pixels, bool); 2]>,
6173    indent_guides: Option<Vec<IndentGuideLayout>>,
6174    visible_display_row_range: Range<DisplayRow>,
6175    active_rows: BTreeMap<DisplayRow, bool>,
6176    highlighted_rows: BTreeMap<DisplayRow, Hsla>,
6177    line_elements: SmallVec<[AnyElement; 1]>,
6178    line_numbers: Vec<Option<ShapedLine>>,
6179    display_hunks: Vec<(DisplayDiffHunk, Option<Hitbox>)>,
6180    blamed_display_rows: Option<Vec<AnyElement>>,
6181    inline_blame: Option<AnyElement>,
6182    blocks: Vec<BlockLayout>,
6183    highlighted_ranges: Vec<(Range<DisplayPoint>, Hsla)>,
6184    highlighted_gutter_ranges: Vec<(Range<DisplayPoint>, Hsla)>,
6185    redacted_ranges: Vec<Range<DisplayPoint>>,
6186    cursors: Vec<(DisplayPoint, Hsla)>,
6187    visible_cursors: Vec<CursorLayout>,
6188    selections: Vec<(PlayerColor, Vec<SelectionLayout>)>,
6189    code_actions_indicator: Option<AnyElement>,
6190    test_indicators: Vec<AnyElement>,
6191    crease_toggles: Vec<Option<AnyElement>>,
6192    crease_trailers: Vec<Option<CreaseTrailerLayout>>,
6193    inline_completion_popover: Option<AnyElement>,
6194    mouse_context_menu: Option<AnyElement>,
6195    tab_invisible: ShapedLine,
6196    space_invisible: ShapedLine,
6197}
6198
6199impl EditorLayout {
6200    fn line_end_overshoot(&self) -> Pixels {
6201        0.15 * self.position_map.line_height
6202    }
6203}
6204
6205struct ColoredRange<T> {
6206    start: T,
6207    end: T,
6208    color: Hsla,
6209}
6210
6211#[derive(Clone)]
6212struct ScrollbarLayout {
6213    hitbox: Hitbox,
6214    visible_row_range: Range<f32>,
6215    visible: bool,
6216    row_height: Pixels,
6217    thumb_height: Pixels,
6218}
6219
6220impl ScrollbarLayout {
6221    const BORDER_WIDTH: Pixels = px(1.0);
6222    const LINE_MARKER_HEIGHT: Pixels = px(2.0);
6223    const MIN_MARKER_HEIGHT: Pixels = px(5.0);
6224    const MIN_THUMB_HEIGHT: Pixels = px(20.0);
6225
6226    fn thumb_bounds(&self) -> Bounds<Pixels> {
6227        let thumb_top = self.y_for_row(self.visible_row_range.start);
6228        let thumb_bottom = thumb_top + self.thumb_height;
6229        Bounds::from_corners(
6230            point(self.hitbox.left(), thumb_top),
6231            point(self.hitbox.right(), thumb_bottom),
6232        )
6233    }
6234
6235    fn y_for_row(&self, row: f32) -> Pixels {
6236        self.hitbox.top() + row * self.row_height
6237    }
6238
6239    fn marker_quads_for_ranges(
6240        &self,
6241        row_ranges: impl IntoIterator<Item = ColoredRange<DisplayRow>>,
6242        column: Option<usize>,
6243    ) -> Vec<PaintQuad> {
6244        struct MinMax {
6245            min: Pixels,
6246            max: Pixels,
6247        }
6248        let (x_range, height_limit) = if let Some(column) = column {
6249            let column_width = px(((self.hitbox.size.width - Self::BORDER_WIDTH).0 / 3.0).floor());
6250            let start = Self::BORDER_WIDTH + (column as f32 * column_width);
6251            let end = start + column_width;
6252            (
6253                Range { start, end },
6254                MinMax {
6255                    min: Self::MIN_MARKER_HEIGHT,
6256                    max: px(f32::MAX),
6257                },
6258            )
6259        } else {
6260            (
6261                Range {
6262                    start: Self::BORDER_WIDTH,
6263                    end: self.hitbox.size.width,
6264                },
6265                MinMax {
6266                    min: Self::LINE_MARKER_HEIGHT,
6267                    max: Self::LINE_MARKER_HEIGHT,
6268                },
6269            )
6270        };
6271
6272        let row_to_y = |row: DisplayRow| row.as_f32() * self.row_height;
6273        let mut pixel_ranges = row_ranges
6274            .into_iter()
6275            .map(|range| {
6276                let start_y = row_to_y(range.start);
6277                let end_y = row_to_y(range.end)
6278                    + self.row_height.max(height_limit.min).min(height_limit.max);
6279                ColoredRange {
6280                    start: start_y,
6281                    end: end_y,
6282                    color: range.color,
6283                }
6284            })
6285            .peekable();
6286
6287        let mut quads = Vec::new();
6288        while let Some(mut pixel_range) = pixel_ranges.next() {
6289            while let Some(next_pixel_range) = pixel_ranges.peek() {
6290                if pixel_range.end >= next_pixel_range.start - px(1.0)
6291                    && pixel_range.color == next_pixel_range.color
6292                {
6293                    pixel_range.end = next_pixel_range.end.max(pixel_range.end);
6294                    pixel_ranges.next();
6295                } else {
6296                    break;
6297                }
6298            }
6299
6300            let bounds = Bounds::from_corners(
6301                point(x_range.start, pixel_range.start),
6302                point(x_range.end, pixel_range.end),
6303            );
6304            quads.push(quad(
6305                bounds,
6306                Corners::default(),
6307                pixel_range.color,
6308                Edges::default(),
6309                Hsla::transparent_black(),
6310            ));
6311        }
6312
6313        quads
6314    }
6315}
6316
6317struct CreaseTrailerLayout {
6318    element: AnyElement,
6319    bounds: Bounds<Pixels>,
6320}
6321
6322struct PositionMap {
6323    size: Size<Pixels>,
6324    line_height: Pixels,
6325    scroll_pixel_position: gpui::Point<Pixels>,
6326    scroll_max: gpui::Point<f32>,
6327    em_width: Pixels,
6328    em_advance: Pixels,
6329    line_layouts: Vec<LineWithInvisibles>,
6330    snapshot: EditorSnapshot,
6331}
6332
6333#[derive(Debug, Copy, Clone)]
6334pub struct PointForPosition {
6335    pub previous_valid: DisplayPoint,
6336    pub next_valid: DisplayPoint,
6337    pub exact_unclipped: DisplayPoint,
6338    pub column_overshoot_after_line_end: u32,
6339}
6340
6341impl PointForPosition {
6342    pub fn as_valid(&self) -> Option<DisplayPoint> {
6343        if self.previous_valid == self.exact_unclipped && self.next_valid == self.exact_unclipped {
6344            Some(self.previous_valid)
6345        } else {
6346            None
6347        }
6348    }
6349}
6350
6351impl PositionMap {
6352    fn point_for_position(
6353        &self,
6354        text_bounds: Bounds<Pixels>,
6355        position: gpui::Point<Pixels>,
6356    ) -> PointForPosition {
6357        let scroll_position = self.snapshot.scroll_position();
6358        let position = position - text_bounds.origin;
6359        let y = position.y.max(px(0.)).min(self.size.height);
6360        let x = position.x + (scroll_position.x * self.em_width);
6361        let row = ((y / self.line_height) + scroll_position.y) as u32;
6362
6363        let (column, x_overshoot_after_line_end) = if let Some(line) = self
6364            .line_layouts
6365            .get(row as usize - scroll_position.y as usize)
6366        {
6367            if let Some(ix) = line.index_for_x(x) {
6368                (ix as u32, px(0.))
6369            } else {
6370                (line.len as u32, px(0.).max(x - line.width))
6371            }
6372        } else {
6373            (0, x)
6374        };
6375
6376        let mut exact_unclipped = DisplayPoint::new(DisplayRow(row), column);
6377        let previous_valid = self.snapshot.clip_point(exact_unclipped, Bias::Left);
6378        let next_valid = self.snapshot.clip_point(exact_unclipped, Bias::Right);
6379
6380        let column_overshoot_after_line_end = (x_overshoot_after_line_end / self.em_advance) as u32;
6381        *exact_unclipped.column_mut() += column_overshoot_after_line_end;
6382        PointForPosition {
6383            previous_valid,
6384            next_valid,
6385            exact_unclipped,
6386            column_overshoot_after_line_end,
6387        }
6388    }
6389}
6390
6391struct BlockLayout {
6392    id: BlockId,
6393    row: Option<DisplayRow>,
6394    element: AnyElement,
6395    available_space: Size<AvailableSpace>,
6396    style: BlockStyle,
6397}
6398
6399fn layout_line(
6400    row: DisplayRow,
6401    snapshot: &EditorSnapshot,
6402    style: &EditorStyle,
6403    text_width: Pixels,
6404    is_row_soft_wrapped: impl Copy + Fn(usize) -> bool,
6405    cx: &mut WindowContext,
6406) -> LineWithInvisibles {
6407    let chunks = snapshot.highlighted_chunks(row..row + DisplayRow(1), true, style);
6408    LineWithInvisibles::from_chunks(
6409        chunks,
6410        &style,
6411        MAX_LINE_LEN,
6412        1,
6413        snapshot.mode,
6414        text_width,
6415        is_row_soft_wrapped,
6416        cx,
6417    )
6418    .pop()
6419    .unwrap()
6420}
6421
6422#[derive(Debug)]
6423pub struct IndentGuideLayout {
6424    origin: gpui::Point<Pixels>,
6425    length: Pixels,
6426    single_indent_width: Pixels,
6427    depth: u32,
6428    active: bool,
6429    settings: IndentGuideSettings,
6430}
6431
6432pub struct CursorLayout {
6433    origin: gpui::Point<Pixels>,
6434    block_width: Pixels,
6435    line_height: Pixels,
6436    color: Hsla,
6437    shape: CursorShape,
6438    block_text: Option<ShapedLine>,
6439    cursor_name: Option<AnyElement>,
6440}
6441
6442#[derive(Debug)]
6443pub struct CursorName {
6444    string: SharedString,
6445    color: Hsla,
6446    is_top_row: bool,
6447}
6448
6449impl CursorLayout {
6450    pub fn new(
6451        origin: gpui::Point<Pixels>,
6452        block_width: Pixels,
6453        line_height: Pixels,
6454        color: Hsla,
6455        shape: CursorShape,
6456        block_text: Option<ShapedLine>,
6457    ) -> CursorLayout {
6458        CursorLayout {
6459            origin,
6460            block_width,
6461            line_height,
6462            color,
6463            shape,
6464            block_text,
6465            cursor_name: None,
6466        }
6467    }
6468
6469    pub fn bounding_rect(&self, origin: gpui::Point<Pixels>) -> Bounds<Pixels> {
6470        Bounds {
6471            origin: self.origin + origin,
6472            size: size(self.block_width, self.line_height),
6473        }
6474    }
6475
6476    fn bounds(&self, origin: gpui::Point<Pixels>) -> Bounds<Pixels> {
6477        match self.shape {
6478            CursorShape::Bar => Bounds {
6479                origin: self.origin + origin,
6480                size: size(px(2.0), self.line_height),
6481            },
6482            CursorShape::Block | CursorShape::Hollow => Bounds {
6483                origin: self.origin + origin,
6484                size: size(self.block_width, self.line_height),
6485            },
6486            CursorShape::Underline => Bounds {
6487                origin: self.origin
6488                    + origin
6489                    + gpui::Point::new(Pixels::ZERO, self.line_height - px(2.0)),
6490                size: size(self.block_width, px(2.0)),
6491            },
6492        }
6493    }
6494
6495    pub fn layout(
6496        &mut self,
6497        origin: gpui::Point<Pixels>,
6498        cursor_name: Option<CursorName>,
6499        cx: &mut WindowContext,
6500    ) {
6501        if let Some(cursor_name) = cursor_name {
6502            let bounds = self.bounds(origin);
6503            let text_size = self.line_height / 1.5;
6504
6505            let name_origin = if cursor_name.is_top_row {
6506                point(bounds.right() - px(1.), bounds.top())
6507            } else {
6508                point(bounds.left(), bounds.top() - text_size / 2. - px(1.))
6509            };
6510            let mut name_element = div()
6511                .bg(self.color)
6512                .text_size(text_size)
6513                .px_0p5()
6514                .line_height(text_size + px(2.))
6515                .text_color(cursor_name.color)
6516                .child(cursor_name.string.clone())
6517                .into_any_element();
6518
6519            name_element.prepaint_as_root(name_origin, AvailableSpace::min_size(), cx);
6520
6521            self.cursor_name = Some(name_element);
6522        }
6523    }
6524
6525    pub fn paint(&mut self, origin: gpui::Point<Pixels>, cx: &mut WindowContext) {
6526        let bounds = self.bounds(origin);
6527
6528        //Draw background or border quad
6529        let cursor = if matches!(self.shape, CursorShape::Hollow) {
6530            outline(bounds, self.color)
6531        } else {
6532            fill(bounds, self.color)
6533        };
6534
6535        if let Some(name) = &mut self.cursor_name {
6536            name.paint(cx);
6537        }
6538
6539        cx.paint_quad(cursor);
6540
6541        if let Some(block_text) = &self.block_text {
6542            block_text
6543                .paint(self.origin + origin, self.line_height, cx)
6544                .log_err();
6545        }
6546    }
6547
6548    pub fn shape(&self) -> CursorShape {
6549        self.shape
6550    }
6551}
6552
6553#[derive(Debug)]
6554pub struct HighlightedRange {
6555    pub start_y: Pixels,
6556    pub line_height: Pixels,
6557    pub lines: Vec<HighlightedRangeLine>,
6558    pub color: Hsla,
6559    pub corner_radius: Pixels,
6560}
6561
6562#[derive(Debug)]
6563pub struct HighlightedRangeLine {
6564    pub start_x: Pixels,
6565    pub end_x: Pixels,
6566}
6567
6568impl HighlightedRange {
6569    pub fn paint(&self, bounds: Bounds<Pixels>, cx: &mut WindowContext) {
6570        if self.lines.len() >= 2 && self.lines[0].start_x > self.lines[1].end_x {
6571            self.paint_lines(self.start_y, &self.lines[0..1], bounds, cx);
6572            self.paint_lines(
6573                self.start_y + self.line_height,
6574                &self.lines[1..],
6575                bounds,
6576                cx,
6577            );
6578        } else {
6579            self.paint_lines(self.start_y, &self.lines, bounds, cx);
6580        }
6581    }
6582
6583    fn paint_lines(
6584        &self,
6585        start_y: Pixels,
6586        lines: &[HighlightedRangeLine],
6587        _bounds: Bounds<Pixels>,
6588        cx: &mut WindowContext,
6589    ) {
6590        if lines.is_empty() {
6591            return;
6592        }
6593
6594        let first_line = lines.first().unwrap();
6595        let last_line = lines.last().unwrap();
6596
6597        let first_top_left = point(first_line.start_x, start_y);
6598        let first_top_right = point(first_line.end_x, start_y);
6599
6600        let curve_height = point(Pixels::ZERO, self.corner_radius);
6601        let curve_width = |start_x: Pixels, end_x: Pixels| {
6602            let max = (end_x - start_x) / 2.;
6603            let width = if max < self.corner_radius {
6604                max
6605            } else {
6606                self.corner_radius
6607            };
6608
6609            point(width, Pixels::ZERO)
6610        };
6611
6612        let top_curve_width = curve_width(first_line.start_x, first_line.end_x);
6613        let mut path = gpui::Path::new(first_top_right - top_curve_width);
6614        path.curve_to(first_top_right + curve_height, first_top_right);
6615
6616        let mut iter = lines.iter().enumerate().peekable();
6617        while let Some((ix, line)) = iter.next() {
6618            let bottom_right = point(line.end_x, start_y + (ix + 1) as f32 * self.line_height);
6619
6620            if let Some((_, next_line)) = iter.peek() {
6621                let next_top_right = point(next_line.end_x, bottom_right.y);
6622
6623                match next_top_right.x.partial_cmp(&bottom_right.x).unwrap() {
6624                    Ordering::Equal => {
6625                        path.line_to(bottom_right);
6626                    }
6627                    Ordering::Less => {
6628                        let curve_width = curve_width(next_top_right.x, bottom_right.x);
6629                        path.line_to(bottom_right - curve_height);
6630                        if self.corner_radius > Pixels::ZERO {
6631                            path.curve_to(bottom_right - curve_width, bottom_right);
6632                        }
6633                        path.line_to(next_top_right + curve_width);
6634                        if self.corner_radius > Pixels::ZERO {
6635                            path.curve_to(next_top_right + curve_height, next_top_right);
6636                        }
6637                    }
6638                    Ordering::Greater => {
6639                        let curve_width = curve_width(bottom_right.x, next_top_right.x);
6640                        path.line_to(bottom_right - curve_height);
6641                        if self.corner_radius > Pixels::ZERO {
6642                            path.curve_to(bottom_right + curve_width, bottom_right);
6643                        }
6644                        path.line_to(next_top_right - curve_width);
6645                        if self.corner_radius > Pixels::ZERO {
6646                            path.curve_to(next_top_right + curve_height, next_top_right);
6647                        }
6648                    }
6649                }
6650            } else {
6651                let curve_width = curve_width(line.start_x, line.end_x);
6652                path.line_to(bottom_right - curve_height);
6653                if self.corner_radius > Pixels::ZERO {
6654                    path.curve_to(bottom_right - curve_width, bottom_right);
6655                }
6656
6657                let bottom_left = point(line.start_x, bottom_right.y);
6658                path.line_to(bottom_left + curve_width);
6659                if self.corner_radius > Pixels::ZERO {
6660                    path.curve_to(bottom_left - curve_height, bottom_left);
6661                }
6662            }
6663        }
6664
6665        if first_line.start_x > last_line.start_x {
6666            let curve_width = curve_width(last_line.start_x, first_line.start_x);
6667            let second_top_left = point(last_line.start_x, start_y + self.line_height);
6668            path.line_to(second_top_left + curve_height);
6669            if self.corner_radius > Pixels::ZERO {
6670                path.curve_to(second_top_left + curve_width, second_top_left);
6671            }
6672            let first_bottom_left = point(first_line.start_x, second_top_left.y);
6673            path.line_to(first_bottom_left - curve_width);
6674            if self.corner_radius > Pixels::ZERO {
6675                path.curve_to(first_bottom_left - curve_height, first_bottom_left);
6676            }
6677        }
6678
6679        path.line_to(first_top_left + curve_height);
6680        if self.corner_radius > Pixels::ZERO {
6681            path.curve_to(first_top_left + top_curve_width, first_top_left);
6682        }
6683        path.line_to(first_top_right - top_curve_width);
6684
6685        cx.paint_path(path, self.color);
6686    }
6687}
6688
6689pub fn scale_vertical_mouse_autoscroll_delta(delta: Pixels) -> f32 {
6690    (delta.pow(1.5) / 100.0).into()
6691}
6692
6693fn scale_horizontal_mouse_autoscroll_delta(delta: Pixels) -> f32 {
6694    (delta.pow(1.2) / 300.0).into()
6695}
6696
6697pub fn register_action<T: Action>(
6698    view: &View<Editor>,
6699    cx: &mut WindowContext,
6700    listener: impl Fn(&mut Editor, &T, &mut ViewContext<Editor>) + 'static,
6701) {
6702    let view = view.clone();
6703    cx.on_action(TypeId::of::<T>(), move |action, phase, cx| {
6704        let action = action.downcast_ref().unwrap();
6705        if phase == DispatchPhase::Bubble {
6706            view.update(cx, |editor, cx| {
6707                listener(editor, action, cx);
6708            })
6709        }
6710    })
6711}
6712
6713fn compute_auto_height_layout(
6714    editor: &mut Editor,
6715    max_lines: usize,
6716    max_line_number_width: Pixels,
6717    known_dimensions: Size<Option<Pixels>>,
6718    available_width: AvailableSpace,
6719    cx: &mut ViewContext<Editor>,
6720) -> Option<Size<Pixels>> {
6721    let width = known_dimensions.width.or({
6722        if let AvailableSpace::Definite(available_width) = available_width {
6723            Some(available_width)
6724        } else {
6725            None
6726        }
6727    })?;
6728    if let Some(height) = known_dimensions.height {
6729        return Some(size(width, height));
6730    }
6731
6732    let style = editor.style.as_ref().unwrap();
6733    let font_id = cx.text_system().resolve_font(&style.text.font());
6734    let font_size = style.text.font_size.to_pixels(cx.rem_size());
6735    let line_height = style.text.line_height_in_pixels(cx.rem_size());
6736    let em_width = cx
6737        .text_system()
6738        .typographic_bounds(font_id, font_size, 'm')
6739        .unwrap()
6740        .size
6741        .width;
6742    let em_advance = cx
6743        .text_system()
6744        .advance(font_id, font_size, 'm')
6745        .unwrap()
6746        .width;
6747
6748    let mut snapshot = editor.snapshot(cx);
6749    let gutter_dimensions = snapshot.gutter_dimensions(
6750        font_id,
6751        font_size,
6752        em_width,
6753        em_advance,
6754        max_line_number_width,
6755        cx,
6756    );
6757
6758    editor.gutter_dimensions = gutter_dimensions;
6759    let text_width = width - gutter_dimensions.width;
6760    let overscroll = size(em_width, px(0.));
6761
6762    let editor_width = text_width - gutter_dimensions.margin - overscroll.width - em_width;
6763    if editor.set_wrap_width(Some(editor_width), cx) {
6764        snapshot = editor.snapshot(cx);
6765    }
6766
6767    let scroll_height = Pixels::from(snapshot.max_point().row().next_row().0) * line_height;
6768    let height = scroll_height
6769        .max(line_height)
6770        .min(line_height * max_lines as f32);
6771
6772    Some(size(width, height))
6773}
6774
6775#[cfg(test)]
6776mod tests {
6777    use super::*;
6778    use crate::{
6779        display_map::{BlockPlacement, BlockProperties},
6780        editor_tests::{init_test, update_test_language_settings},
6781        Editor, MultiBuffer,
6782    };
6783    use gpui::{TestAppContext, VisualTestContext};
6784    use language::language_settings;
6785    use log::info;
6786    use std::num::NonZeroU32;
6787    use util::test::sample_text;
6788
6789    #[gpui::test]
6790    fn test_shape_line_numbers(cx: &mut TestAppContext) {
6791        init_test(cx, |_| {});
6792        let window = cx.add_window(|cx| {
6793            let buffer = MultiBuffer::build_simple(&sample_text(6, 6, 'a'), cx);
6794            Editor::new(EditorMode::Full, buffer, None, true, cx)
6795        });
6796
6797        let editor = window.root(cx).unwrap();
6798        let style = cx.update(|cx| editor.read(cx).style().unwrap().clone());
6799        let element = EditorElement::new(&editor, style);
6800        let snapshot = window.update(cx, |editor, cx| editor.snapshot(cx)).unwrap();
6801
6802        let layouts = cx
6803            .update_window(*window, |_, cx| {
6804                element.layout_line_numbers(
6805                    DisplayRow(0)..DisplayRow(6),
6806                    (0..6).map(MultiBufferRow).map(Some),
6807                    &Default::default(),
6808                    Some(DisplayPoint::new(DisplayRow(0), 0)),
6809                    &snapshot,
6810                    cx,
6811                )
6812            })
6813            .unwrap();
6814        assert_eq!(layouts.len(), 6);
6815
6816        let relative_rows = window
6817            .update(cx, |editor, cx| {
6818                let snapshot = editor.snapshot(cx);
6819                element.calculate_relative_line_numbers(
6820                    &snapshot,
6821                    &(DisplayRow(0)..DisplayRow(6)),
6822                    Some(DisplayRow(3)),
6823                )
6824            })
6825            .unwrap();
6826        assert_eq!(relative_rows[&DisplayRow(0)], 3);
6827        assert_eq!(relative_rows[&DisplayRow(1)], 2);
6828        assert_eq!(relative_rows[&DisplayRow(2)], 1);
6829        // current line has no relative number
6830        assert_eq!(relative_rows[&DisplayRow(4)], 1);
6831        assert_eq!(relative_rows[&DisplayRow(5)], 2);
6832
6833        // works if cursor is before screen
6834        let relative_rows = window
6835            .update(cx, |editor, cx| {
6836                let snapshot = editor.snapshot(cx);
6837                element.calculate_relative_line_numbers(
6838                    &snapshot,
6839                    &(DisplayRow(3)..DisplayRow(6)),
6840                    Some(DisplayRow(1)),
6841                )
6842            })
6843            .unwrap();
6844        assert_eq!(relative_rows.len(), 3);
6845        assert_eq!(relative_rows[&DisplayRow(3)], 2);
6846        assert_eq!(relative_rows[&DisplayRow(4)], 3);
6847        assert_eq!(relative_rows[&DisplayRow(5)], 4);
6848
6849        // works if cursor is after screen
6850        let relative_rows = window
6851            .update(cx, |editor, cx| {
6852                let snapshot = editor.snapshot(cx);
6853                element.calculate_relative_line_numbers(
6854                    &snapshot,
6855                    &(DisplayRow(0)..DisplayRow(3)),
6856                    Some(DisplayRow(6)),
6857                )
6858            })
6859            .unwrap();
6860        assert_eq!(relative_rows.len(), 3);
6861        assert_eq!(relative_rows[&DisplayRow(0)], 5);
6862        assert_eq!(relative_rows[&DisplayRow(1)], 4);
6863        assert_eq!(relative_rows[&DisplayRow(2)], 3);
6864    }
6865
6866    #[gpui::test]
6867    async fn test_vim_visual_selections(cx: &mut TestAppContext) {
6868        init_test(cx, |_| {});
6869
6870        let window = cx.add_window(|cx| {
6871            let buffer = MultiBuffer::build_simple(&(sample_text(6, 6, 'a') + "\n"), cx);
6872            Editor::new(EditorMode::Full, buffer, None, true, cx)
6873        });
6874        let cx = &mut VisualTestContext::from_window(*window, cx);
6875        let editor = window.root(cx).unwrap();
6876        let style = cx.update(|cx| editor.read(cx).style().unwrap().clone());
6877
6878        window
6879            .update(cx, |editor, cx| {
6880                editor.cursor_shape = CursorShape::Block;
6881                editor.change_selections(None, cx, |s| {
6882                    s.select_ranges([
6883                        Point::new(0, 0)..Point::new(1, 0),
6884                        Point::new(3, 2)..Point::new(3, 3),
6885                        Point::new(5, 6)..Point::new(6, 0),
6886                    ]);
6887                });
6888            })
6889            .unwrap();
6890
6891        let (_, state) = cx.draw(point(px(500.), px(500.)), size(px(500.), px(500.)), |_| {
6892            EditorElement::new(&editor, style)
6893        });
6894
6895        assert_eq!(state.selections.len(), 1);
6896        let local_selections = &state.selections[0].1;
6897        assert_eq!(local_selections.len(), 3);
6898        // moves cursor back one line
6899        assert_eq!(
6900            local_selections[0].head,
6901            DisplayPoint::new(DisplayRow(0), 6)
6902        );
6903        assert_eq!(
6904            local_selections[0].range,
6905            DisplayPoint::new(DisplayRow(0), 0)..DisplayPoint::new(DisplayRow(1), 0)
6906        );
6907
6908        // moves cursor back one column
6909        assert_eq!(
6910            local_selections[1].range,
6911            DisplayPoint::new(DisplayRow(3), 2)..DisplayPoint::new(DisplayRow(3), 3)
6912        );
6913        assert_eq!(
6914            local_selections[1].head,
6915            DisplayPoint::new(DisplayRow(3), 2)
6916        );
6917
6918        // leaves cursor on the max point
6919        assert_eq!(
6920            local_selections[2].range,
6921            DisplayPoint::new(DisplayRow(5), 6)..DisplayPoint::new(DisplayRow(6), 0)
6922        );
6923        assert_eq!(
6924            local_selections[2].head,
6925            DisplayPoint::new(DisplayRow(6), 0)
6926        );
6927
6928        // active lines does not include 1 (even though the range of the selection does)
6929        assert_eq!(
6930            state.active_rows.keys().cloned().collect::<Vec<_>>(),
6931            vec![DisplayRow(0), DisplayRow(3), DisplayRow(5), DisplayRow(6)]
6932        );
6933
6934        // multi-buffer support
6935        // in DisplayPoint coordinates, this is what we're dealing with:
6936        //  0: [[file
6937        //  1:   header
6938        //  2:   section]]
6939        //  3: aaaaaa
6940        //  4: bbbbbb
6941        //  5: cccccc
6942        //  6:
6943        //  7: [[footer]]
6944        //  8: [[header]]
6945        //  9: ffffff
6946        // 10: gggggg
6947        // 11: hhhhhh
6948        // 12:
6949        // 13: [[footer]]
6950        // 14: [[file
6951        // 15:   header
6952        // 16:   section]]
6953        // 17: bbbbbb
6954        // 18: cccccc
6955        // 19: dddddd
6956        // 20: [[footer]]
6957        let window = cx.add_window(|cx| {
6958            let buffer = MultiBuffer::build_multi(
6959                [
6960                    (
6961                        &(sample_text(8, 6, 'a') + "\n"),
6962                        vec![
6963                            Point::new(0, 0)..Point::new(3, 0),
6964                            Point::new(4, 0)..Point::new(7, 0),
6965                        ],
6966                    ),
6967                    (
6968                        &(sample_text(8, 6, 'a') + "\n"),
6969                        vec![Point::new(1, 0)..Point::new(3, 0)],
6970                    ),
6971                ],
6972                cx,
6973            );
6974            Editor::new(EditorMode::Full, buffer, None, true, cx)
6975        });
6976        let editor = window.root(cx).unwrap();
6977        let style = cx.update(|cx| editor.read(cx).style().unwrap().clone());
6978        let _state = window.update(cx, |editor, cx| {
6979            editor.cursor_shape = CursorShape::Block;
6980            editor.change_selections(None, cx, |s| {
6981                s.select_display_ranges([
6982                    DisplayPoint::new(DisplayRow(4), 0)..DisplayPoint::new(DisplayRow(7), 0),
6983                    DisplayPoint::new(DisplayRow(10), 0)..DisplayPoint::new(DisplayRow(13), 0),
6984                ]);
6985            });
6986        });
6987
6988        let (_, state) = cx.draw(point(px(500.), px(500.)), size(px(500.), px(500.)), |_| {
6989            EditorElement::new(&editor, style)
6990        });
6991        assert_eq!(state.selections.len(), 1);
6992        let local_selections = &state.selections[0].1;
6993        assert_eq!(local_selections.len(), 2);
6994
6995        // moves cursor on excerpt boundary back a line
6996        // and doesn't allow selection to bleed through
6997        assert_eq!(
6998            local_selections[0].range,
6999            DisplayPoint::new(DisplayRow(4), 0)..DisplayPoint::new(DisplayRow(7), 0)
7000        );
7001        assert_eq!(
7002            local_selections[0].head,
7003            DisplayPoint::new(DisplayRow(6), 0)
7004        );
7005        // moves cursor on buffer boundary back two lines
7006        // and doesn't allow selection to bleed through
7007        assert_eq!(
7008            local_selections[1].range,
7009            DisplayPoint::new(DisplayRow(10), 0)..DisplayPoint::new(DisplayRow(13), 0)
7010        );
7011        assert_eq!(
7012            local_selections[1].head,
7013            DisplayPoint::new(DisplayRow(12), 0)
7014        );
7015    }
7016
7017    #[gpui::test]
7018    fn test_layout_with_placeholder_text_and_blocks(cx: &mut TestAppContext) {
7019        init_test(cx, |_| {});
7020
7021        let window = cx.add_window(|cx| {
7022            let buffer = MultiBuffer::build_simple("", cx);
7023            Editor::new(EditorMode::Full, buffer, None, true, cx)
7024        });
7025        let cx = &mut VisualTestContext::from_window(*window, cx);
7026        let editor = window.root(cx).unwrap();
7027        let style = cx.update(|cx| editor.read(cx).style().unwrap().clone());
7028        window
7029            .update(cx, |editor, cx| {
7030                editor.set_placeholder_text("hello", cx);
7031                editor.insert_blocks(
7032                    [BlockProperties {
7033                        style: BlockStyle::Fixed,
7034                        placement: BlockPlacement::Above(Anchor::min()),
7035                        height: 3,
7036                        render: Arc::new(|cx| div().h(3. * cx.line_height()).into_any()),
7037                        priority: 0,
7038                    }],
7039                    None,
7040                    cx,
7041                );
7042
7043                // Blur the editor so that it displays placeholder text.
7044                cx.blur();
7045            })
7046            .unwrap();
7047
7048        let (_, state) = cx.draw(point(px(500.), px(500.)), size(px(500.), px(500.)), |_| {
7049            EditorElement::new(&editor, style)
7050        });
7051        assert_eq!(state.position_map.line_layouts.len(), 4);
7052        assert_eq!(
7053            state
7054                .line_numbers
7055                .iter()
7056                .map(Option::is_some)
7057                .collect::<Vec<_>>(),
7058            &[false, false, false, true]
7059        );
7060    }
7061
7062    #[gpui::test]
7063    fn test_all_invisibles_drawing(cx: &mut TestAppContext) {
7064        const TAB_SIZE: u32 = 4;
7065
7066        let input_text = "\t \t|\t| a b";
7067        let expected_invisibles = vec![
7068            Invisible::Tab {
7069                line_start_offset: 0,
7070                line_end_offset: TAB_SIZE as usize,
7071            },
7072            Invisible::Whitespace {
7073                line_offset: TAB_SIZE as usize,
7074            },
7075            Invisible::Tab {
7076                line_start_offset: TAB_SIZE as usize + 1,
7077                line_end_offset: TAB_SIZE as usize * 2,
7078            },
7079            Invisible::Tab {
7080                line_start_offset: TAB_SIZE as usize * 2 + 1,
7081                line_end_offset: TAB_SIZE as usize * 3,
7082            },
7083            Invisible::Whitespace {
7084                line_offset: TAB_SIZE as usize * 3 + 1,
7085            },
7086            Invisible::Whitespace {
7087                line_offset: TAB_SIZE as usize * 3 + 3,
7088            },
7089        ];
7090        assert_eq!(
7091            expected_invisibles.len(),
7092            input_text
7093                .chars()
7094                .filter(|initial_char| initial_char.is_whitespace())
7095                .count(),
7096            "Hardcoded expected invisibles differ from the actual ones in '{input_text}'"
7097        );
7098
7099        for show_line_numbers in [true, false] {
7100            init_test(cx, |s| {
7101                s.defaults.show_whitespaces = Some(ShowWhitespaceSetting::All);
7102                s.defaults.tab_size = NonZeroU32::new(TAB_SIZE);
7103            });
7104
7105            let actual_invisibles = collect_invisibles_from_new_editor(
7106                cx,
7107                EditorMode::Full,
7108                input_text,
7109                px(500.0),
7110                show_line_numbers,
7111            );
7112
7113            assert_eq!(expected_invisibles, actual_invisibles);
7114        }
7115    }
7116
7117    #[gpui::test]
7118    fn test_invisibles_dont_appear_in_certain_editors(cx: &mut TestAppContext) {
7119        init_test(cx, |s| {
7120            s.defaults.show_whitespaces = Some(ShowWhitespaceSetting::All);
7121            s.defaults.tab_size = NonZeroU32::new(4);
7122        });
7123
7124        for editor_mode_without_invisibles in [
7125            EditorMode::SingleLine { auto_width: false },
7126            EditorMode::AutoHeight { max_lines: 100 },
7127        ] {
7128            for show_line_numbers in [true, false] {
7129                let invisibles = collect_invisibles_from_new_editor(
7130                    cx,
7131                    editor_mode_without_invisibles,
7132                    "\t\t\t| | a b",
7133                    px(500.0),
7134                    show_line_numbers,
7135                );
7136                assert!(invisibles.is_empty(),
7137                    "For editor mode {editor_mode_without_invisibles:?} no invisibles was expected but got {invisibles:?}");
7138            }
7139        }
7140    }
7141
7142    #[gpui::test]
7143    fn test_wrapped_invisibles_drawing(cx: &mut TestAppContext) {
7144        let tab_size = 4;
7145        let input_text = "a\tbcd     ".repeat(9);
7146        let repeated_invisibles = [
7147            Invisible::Tab {
7148                line_start_offset: 1,
7149                line_end_offset: tab_size as usize,
7150            },
7151            Invisible::Whitespace {
7152                line_offset: tab_size as usize + 3,
7153            },
7154            Invisible::Whitespace {
7155                line_offset: tab_size as usize + 4,
7156            },
7157            Invisible::Whitespace {
7158                line_offset: tab_size as usize + 5,
7159            },
7160            Invisible::Whitespace {
7161                line_offset: tab_size as usize + 6,
7162            },
7163            Invisible::Whitespace {
7164                line_offset: tab_size as usize + 7,
7165            },
7166        ];
7167        let expected_invisibles = std::iter::once(repeated_invisibles)
7168            .cycle()
7169            .take(9)
7170            .flatten()
7171            .collect::<Vec<_>>();
7172        assert_eq!(
7173            expected_invisibles.len(),
7174            input_text
7175                .chars()
7176                .filter(|initial_char| initial_char.is_whitespace())
7177                .count(),
7178            "Hardcoded expected invisibles differ from the actual ones in '{input_text}'"
7179        );
7180        info!("Expected invisibles: {expected_invisibles:?}");
7181
7182        init_test(cx, |_| {});
7183
7184        // Put the same string with repeating whitespace pattern into editors of various size,
7185        // take deliberately small steps during resizing, to put all whitespace kinds near the wrap point.
7186        let resize_step = 10.0;
7187        let mut editor_width = 200.0;
7188        while editor_width <= 1000.0 {
7189            for show_line_numbers in [true, false] {
7190                update_test_language_settings(cx, |s| {
7191                    s.defaults.tab_size = NonZeroU32::new(tab_size);
7192                    s.defaults.show_whitespaces = Some(ShowWhitespaceSetting::All);
7193                    s.defaults.preferred_line_length = Some(editor_width as u32);
7194                    s.defaults.soft_wrap = Some(language_settings::SoftWrap::PreferredLineLength);
7195                });
7196
7197                let actual_invisibles = collect_invisibles_from_new_editor(
7198                    cx,
7199                    EditorMode::Full,
7200                    &input_text,
7201                    px(editor_width),
7202                    show_line_numbers,
7203                );
7204
7205                // Whatever the editor size is, ensure it has the same invisible kinds in the same order
7206                // (no good guarantees about the offsets: wrapping could trigger padding and its tests should check the offsets).
7207                let mut i = 0;
7208                for (actual_index, actual_invisible) in actual_invisibles.iter().enumerate() {
7209                    i = actual_index;
7210                    match expected_invisibles.get(i) {
7211                        Some(expected_invisible) => match (expected_invisible, actual_invisible) {
7212                            (Invisible::Whitespace { .. }, Invisible::Whitespace { .. })
7213                            | (Invisible::Tab { .. }, Invisible::Tab { .. }) => {}
7214                            _ => {
7215                                panic!("At index {i}, expected invisible {expected_invisible:?} does not match actual {actual_invisible:?} by kind. Actual invisibles: {actual_invisibles:?}")
7216                            }
7217                        },
7218                        None => {
7219                            panic!("Unexpected extra invisible {actual_invisible:?} at index {i}")
7220                        }
7221                    }
7222                }
7223                let missing_expected_invisibles = &expected_invisibles[i + 1..];
7224                assert!(
7225                    missing_expected_invisibles.is_empty(),
7226                    "Missing expected invisibles after index {i}: {missing_expected_invisibles:?}"
7227                );
7228
7229                editor_width += resize_step;
7230            }
7231        }
7232    }
7233
7234    #[gpui::test]
7235    fn test_inline_completion_popover_text(cx: &mut TestAppContext) {
7236        init_test(cx, |_| {});
7237
7238        // Test case 1: Simple insertion
7239        {
7240            let window = cx.add_window(|cx| {
7241                let buffer = MultiBuffer::build_simple("Hello, world!", cx);
7242                Editor::new(EditorMode::Full, buffer, None, true, cx)
7243            });
7244            let cx = &mut VisualTestContext::from_window(*window, cx);
7245
7246            window
7247                .update(cx, |editor, cx| {
7248                    let snapshot = editor.snapshot(cx);
7249                    let edit_range = snapshot.buffer_snapshot.anchor_after(Point::new(0, 6))
7250                        ..snapshot.buffer_snapshot.anchor_before(Point::new(0, 6));
7251                    let edits = vec![(edit_range, " beautiful".to_string())];
7252
7253                    let (text, highlights) = inline_completion_popover_text(&snapshot, &edits, cx);
7254
7255                    assert_eq!(text, "Hello, beautiful world!");
7256                    assert_eq!(highlights.len(), 1);
7257                    assert_eq!(highlights[0].0, 6..16);
7258                    assert_eq!(
7259                        highlights[0].1.background_color,
7260                        Some(cx.theme().status().created_background)
7261                    );
7262                })
7263                .unwrap();
7264        }
7265
7266        // Test case 2: Replacement
7267        {
7268            let window = cx.add_window(|cx| {
7269                let buffer = MultiBuffer::build_simple("This is a test.", cx);
7270                Editor::new(EditorMode::Full, buffer, None, true, cx)
7271            });
7272            let cx = &mut VisualTestContext::from_window(*window, cx);
7273
7274            window
7275                .update(cx, |editor, cx| {
7276                    let snapshot = editor.snapshot(cx);
7277                    let edits = vec![(
7278                        snapshot.buffer_snapshot.anchor_after(Point::new(0, 0))
7279                            ..snapshot.buffer_snapshot.anchor_before(Point::new(0, 4)),
7280                        "That".to_string(),
7281                    )];
7282
7283                    let (text, highlights) = inline_completion_popover_text(&snapshot, &edits, cx);
7284
7285                    assert_eq!(text, "That is a test.");
7286                    assert_eq!(highlights.len(), 1);
7287                    assert_eq!(highlights[0].0, 0..4);
7288                    assert_eq!(
7289                        highlights[0].1.background_color,
7290                        Some(cx.theme().status().created_background)
7291                    );
7292                })
7293                .unwrap();
7294        }
7295
7296        // Test case 3: Multiple edits
7297        {
7298            let window = cx.add_window(|cx| {
7299                let buffer = MultiBuffer::build_simple("Hello, world!", cx);
7300                Editor::new(EditorMode::Full, buffer, None, true, cx)
7301            });
7302            let cx = &mut VisualTestContext::from_window(*window, cx);
7303
7304            window
7305                .update(cx, |editor, cx| {
7306                    let snapshot = editor.snapshot(cx);
7307                    let edits = vec![
7308                        (
7309                            snapshot.buffer_snapshot.anchor_after(Point::new(0, 0))
7310                                ..snapshot.buffer_snapshot.anchor_before(Point::new(0, 5)),
7311                            "Greetings".into(),
7312                        ),
7313                        (
7314                            snapshot.buffer_snapshot.anchor_after(Point::new(0, 12))
7315                                ..snapshot.buffer_snapshot.anchor_before(Point::new(0, 12)),
7316                            " and universe".into(),
7317                        ),
7318                    ];
7319
7320                    let (text, highlights) = inline_completion_popover_text(&snapshot, &edits, cx);
7321
7322                    assert_eq!(text, "Greetings, world and universe!");
7323                    assert_eq!(highlights.len(), 2);
7324                    assert_eq!(highlights[0].0, 0..9);
7325                    assert_eq!(highlights[1].0, 16..29);
7326                    assert_eq!(
7327                        highlights[0].1.background_color,
7328                        Some(cx.theme().status().created_background)
7329                    );
7330                    assert_eq!(
7331                        highlights[1].1.background_color,
7332                        Some(cx.theme().status().created_background)
7333                    );
7334                })
7335                .unwrap();
7336        }
7337
7338        // Test case 4: Multiple lines with edits
7339        {
7340            let window = cx.add_window(|cx| {
7341                let buffer = MultiBuffer::build_simple(
7342                    "First line\nSecond line\nThird line\nFourth line",
7343                    cx,
7344                );
7345                Editor::new(EditorMode::Full, buffer, None, true, cx)
7346            });
7347            let cx = &mut VisualTestContext::from_window(*window, cx);
7348
7349            window
7350                .update(cx, |editor, cx| {
7351                    let snapshot = editor.snapshot(cx);
7352                    let edits = vec![
7353                        (
7354                            snapshot.buffer_snapshot.anchor_before(Point::new(1, 7))
7355                                ..snapshot.buffer_snapshot.anchor_before(Point::new(1, 11)),
7356                            "modified".to_string(),
7357                        ),
7358                        (
7359                            snapshot.buffer_snapshot.anchor_before(Point::new(2, 0))
7360                                ..snapshot.buffer_snapshot.anchor_before(Point::new(2, 10)),
7361                            "New third line".to_string(),
7362                        ),
7363                        (
7364                            snapshot.buffer_snapshot.anchor_before(Point::new(3, 6))
7365                                ..snapshot.buffer_snapshot.anchor_before(Point::new(3, 6)),
7366                            " updated".to_string(),
7367                        ),
7368                    ];
7369
7370                    let (text, highlights) = inline_completion_popover_text(&snapshot, &edits, cx);
7371
7372                    assert_eq!(text, "Second modified\nNew third line\nFourth updated line");
7373                    assert_eq!(highlights.len(), 3);
7374                    assert_eq!(highlights[0].0, 7..15); // "modified"
7375                    assert_eq!(highlights[1].0, 16..30); // "New third line"
7376                    assert_eq!(highlights[2].0, 37..45); // " updated"
7377
7378                    for highlight in &highlights {
7379                        assert_eq!(
7380                            highlight.1.background_color,
7381                            Some(cx.theme().status().created_background)
7382                        );
7383                    }
7384                })
7385                .unwrap();
7386        }
7387    }
7388
7389    fn collect_invisibles_from_new_editor(
7390        cx: &mut TestAppContext,
7391        editor_mode: EditorMode,
7392        input_text: &str,
7393        editor_width: Pixels,
7394        show_line_numbers: bool,
7395    ) -> Vec<Invisible> {
7396        info!(
7397            "Creating editor with mode {editor_mode:?}, width {}px and text '{input_text}'",
7398            editor_width.0
7399        );
7400        let window = cx.add_window(|cx| {
7401            let buffer = MultiBuffer::build_simple(input_text, cx);
7402            Editor::new(editor_mode, buffer, None, true, cx)
7403        });
7404        let cx = &mut VisualTestContext::from_window(*window, cx);
7405        let editor = window.root(cx).unwrap();
7406
7407        let style = cx.update(|cx| editor.read(cx).style().unwrap().clone());
7408        window
7409            .update(cx, |editor, cx| {
7410                editor.set_soft_wrap_mode(language_settings::SoftWrap::EditorWidth, cx);
7411                editor.set_wrap_width(Some(editor_width), cx);
7412                editor.set_show_line_numbers(show_line_numbers, cx);
7413            })
7414            .unwrap();
7415        let (_, state) = cx.draw(point(px(500.), px(500.)), size(px(500.), px(500.)), |_| {
7416            EditorElement::new(&editor, style)
7417        });
7418        state
7419            .position_map
7420            .line_layouts
7421            .iter()
7422            .flat_map(|line_with_invisibles| &line_with_invisibles.invisibles)
7423            .cloned()
7424            .collect()
7425    }
7426}