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 git::{blame::BlameEntry, diff::DiffHunkStatus, Oid};
  31use gpui::{
  32    anchored, deferred, div, fill, outline, point, px, quad, relative, size, svg,
  33    transparent_black, Action, AnchorCorner, AnyElement, AvailableSpace, Bounds, ClipboardItem,
  34    ContentMask, Corners, CursorStyle, DispatchPhase, Edges, Element, ElementInputHandler, Entity,
  35    FontId, GlobalElementId, HighlightStyle, Hitbox, Hsla, InteractiveElement, IntoElement, Length,
  36    ModifiersChangedEvent, MouseButton, MouseDownEvent, MouseMoveEvent, MouseUpEvent, PaintQuad,
  37    ParentElement, Pixels, ScrollDelta, ScrollWheelEvent, ShapedLine, SharedString, Size,
  38    StatefulInteractiveElement, Style, Styled, TextRun, TextStyleRefinement, View, ViewContext,
  39    WeakView, WindowContext,
  40};
  41use gpui::{ClickEvent, Subscription};
  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, ExpandExcerptDirection, MultiBufferPoint, MultiBufferRow,
  53    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.read().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
1717                    if snapshot.is_line_folded(multibuffer_row) {
1718                        // Skip folded indicators, unless it's the starting line of a fold.
1719                        if multibuffer_row
1720                            .0
1721                            .checked_sub(1)
1722                            .map_or(false, |previous_row| {
1723                                snapshot.is_line_folded(MultiBufferRow(previous_row))
1724                            })
1725                        {
1726                            return None;
1727                        }
1728                    }
1729                    let display_row = multibuffer_point.to_display_point(snapshot).row();
1730                    let button = editor.render_run_indicator(
1731                        &self.style,
1732                        Some(display_row) == active_task_indicator_row,
1733                        display_row,
1734                        cx,
1735                    );
1736
1737                    let button = prepaint_gutter_button(
1738                        button,
1739                        display_row,
1740                        line_height,
1741                        gutter_dimensions,
1742                        scroll_pixel_position,
1743                        gutter_hitbox,
1744                        rows_with_hunk_bounds,
1745                        cx,
1746                    );
1747                    Some(button)
1748                })
1749                .collect_vec()
1750        })
1751    }
1752
1753    #[allow(clippy::too_many_arguments)]
1754    fn layout_code_actions_indicator(
1755        &self,
1756        line_height: Pixels,
1757        newest_selection_head: DisplayPoint,
1758        scroll_pixel_position: gpui::Point<Pixels>,
1759        gutter_dimensions: &GutterDimensions,
1760        gutter_hitbox: &Hitbox,
1761        rows_with_hunk_bounds: &HashMap<DisplayRow, Bounds<Pixels>>,
1762        cx: &mut WindowContext,
1763    ) -> Option<AnyElement> {
1764        let mut active = false;
1765        let mut button = None;
1766        let row = newest_selection_head.row();
1767        self.editor.update(cx, |editor, cx| {
1768            if let Some(crate::CodeContextMenu::CodeActions(CodeActionsMenu {
1769                deployed_from_indicator,
1770                ..
1771            })) = editor.context_menu.read().as_ref()
1772            {
1773                active = deployed_from_indicator.map_or(true, |indicator_row| indicator_row == row);
1774            };
1775            button = editor.render_code_actions_indicator(&self.style, row, active, cx);
1776        });
1777
1778        let button = prepaint_gutter_button(
1779            button?,
1780            row,
1781            line_height,
1782            gutter_dimensions,
1783            scroll_pixel_position,
1784            gutter_hitbox,
1785            rows_with_hunk_bounds,
1786            cx,
1787        );
1788
1789        Some(button)
1790    }
1791
1792    fn get_participant_color(
1793        participant_index: Option<ParticipantIndex>,
1794        cx: &WindowContext,
1795    ) -> PlayerColor {
1796        if let Some(index) = participant_index {
1797            cx.theme().players().color_for_participant(index.0)
1798        } else {
1799            cx.theme().players().absent()
1800        }
1801    }
1802
1803    fn calculate_relative_line_numbers(
1804        &self,
1805        snapshot: &EditorSnapshot,
1806        rows: &Range<DisplayRow>,
1807        relative_to: Option<DisplayRow>,
1808    ) -> HashMap<DisplayRow, DisplayRowDelta> {
1809        let mut relative_rows: HashMap<DisplayRow, DisplayRowDelta> = Default::default();
1810        let Some(relative_to) = relative_to else {
1811            return relative_rows;
1812        };
1813
1814        let start = rows.start.min(relative_to);
1815        let end = rows.end.max(relative_to);
1816
1817        let buffer_rows = snapshot
1818            .buffer_rows(start)
1819            .take(1 + end.minus(start) as usize)
1820            .collect::<Vec<_>>();
1821
1822        let head_idx = relative_to.minus(start);
1823        let mut delta = 1;
1824        let mut i = head_idx + 1;
1825        while i < buffer_rows.len() as u32 {
1826            if buffer_rows[i as usize].is_some() {
1827                if rows.contains(&DisplayRow(i + start.0)) {
1828                    relative_rows.insert(DisplayRow(i + start.0), delta);
1829                }
1830                delta += 1;
1831            }
1832            i += 1;
1833        }
1834        delta = 1;
1835        i = head_idx.min(buffer_rows.len() as u32 - 1);
1836        while i > 0 && buffer_rows[i as usize].is_none() {
1837            i -= 1;
1838        }
1839
1840        while i > 0 {
1841            i -= 1;
1842            if buffer_rows[i as usize].is_some() {
1843                if rows.contains(&DisplayRow(i + start.0)) {
1844                    relative_rows.insert(DisplayRow(i + start.0), delta);
1845                }
1846                delta += 1;
1847            }
1848        }
1849
1850        relative_rows
1851    }
1852
1853    fn layout_line_numbers(
1854        &self,
1855        rows: Range<DisplayRow>,
1856        buffer_rows: impl Iterator<Item = Option<MultiBufferRow>>,
1857        active_rows: &BTreeMap<DisplayRow, bool>,
1858        newest_selection_head: Option<DisplayPoint>,
1859        snapshot: &EditorSnapshot,
1860        cx: &mut WindowContext,
1861    ) -> Vec<Option<ShapedLine>> {
1862        let include_line_numbers = snapshot.show_line_numbers.unwrap_or_else(|| {
1863            EditorSettings::get_global(cx).gutter.line_numbers && snapshot.mode == EditorMode::Full
1864        });
1865        if !include_line_numbers {
1866            return Vec::new();
1867        }
1868
1869        let (newest_selection_head, is_relative) = self.editor.update(cx, |editor, cx| {
1870            let newest_selection_head = newest_selection_head.unwrap_or_else(|| {
1871                let newest = editor.selections.newest::<Point>(cx);
1872                SelectionLayout::new(
1873                    newest,
1874                    editor.selections.line_mode,
1875                    editor.cursor_shape,
1876                    &snapshot.display_snapshot,
1877                    true,
1878                    true,
1879                    None,
1880                )
1881                .head
1882            });
1883            let is_relative = editor.should_use_relative_line_numbers(cx);
1884            (newest_selection_head, is_relative)
1885        });
1886        let font_size = self.style.text.font_size.to_pixels(cx.rem_size());
1887
1888        let relative_to = if is_relative {
1889            Some(newest_selection_head.row())
1890        } else {
1891            None
1892        };
1893        let relative_rows = self.calculate_relative_line_numbers(snapshot, &rows, relative_to);
1894        let mut line_number = String::new();
1895        buffer_rows
1896            .into_iter()
1897            .enumerate()
1898            .map(|(ix, multibuffer_row)| {
1899                let multibuffer_row = multibuffer_row?;
1900                let display_row = DisplayRow(rows.start.0 + ix as u32);
1901                let color = if active_rows.contains_key(&display_row) {
1902                    cx.theme().colors().editor_active_line_number
1903                } else {
1904                    cx.theme().colors().editor_line_number
1905                };
1906                line_number.clear();
1907                let default_number = multibuffer_row.0 + 1;
1908                let number = relative_rows
1909                    .get(&DisplayRow(ix as u32 + rows.start.0))
1910                    .unwrap_or(&default_number);
1911                write!(&mut line_number, "{number}").unwrap();
1912                let run = TextRun {
1913                    len: line_number.len(),
1914                    font: self.style.text.font(),
1915                    color,
1916                    background_color: None,
1917                    underline: None,
1918                    strikethrough: None,
1919                };
1920                let shaped_line = cx
1921                    .text_system()
1922                    .shape_line(line_number.clone().into(), font_size, &[run])
1923                    .unwrap();
1924                Some(shaped_line)
1925            })
1926            .collect()
1927    }
1928
1929    fn layout_crease_toggles(
1930        &self,
1931        rows: Range<DisplayRow>,
1932        buffer_rows: impl IntoIterator<Item = Option<MultiBufferRow>>,
1933        active_rows: &BTreeMap<DisplayRow, bool>,
1934        snapshot: &EditorSnapshot,
1935        cx: &mut WindowContext,
1936    ) -> Vec<Option<AnyElement>> {
1937        let include_fold_statuses = EditorSettings::get_global(cx).gutter.folds
1938            && snapshot.mode == EditorMode::Full
1939            && self.editor.read(cx).is_singleton(cx);
1940        if include_fold_statuses {
1941            buffer_rows
1942                .into_iter()
1943                .enumerate()
1944                .map(|(ix, row)| {
1945                    if let Some(multibuffer_row) = row {
1946                        let display_row = DisplayRow(rows.start.0 + ix as u32);
1947                        let active = active_rows.contains_key(&display_row);
1948                        snapshot.render_crease_toggle(
1949                            multibuffer_row,
1950                            active,
1951                            self.editor.clone(),
1952                            cx,
1953                        )
1954                    } else {
1955                        None
1956                    }
1957                })
1958                .collect()
1959        } else {
1960            Vec::new()
1961        }
1962    }
1963
1964    fn layout_crease_trailers(
1965        &self,
1966        buffer_rows: impl IntoIterator<Item = Option<MultiBufferRow>>,
1967        snapshot: &EditorSnapshot,
1968        cx: &mut WindowContext,
1969    ) -> Vec<Option<AnyElement>> {
1970        buffer_rows
1971            .into_iter()
1972            .map(|row| {
1973                if let Some(multibuffer_row) = row {
1974                    snapshot.render_crease_trailer(multibuffer_row, cx)
1975                } else {
1976                    None
1977                }
1978            })
1979            .collect()
1980    }
1981
1982    fn layout_lines(
1983        rows: Range<DisplayRow>,
1984        snapshot: &EditorSnapshot,
1985        style: &EditorStyle,
1986        editor_width: Pixels,
1987        is_row_soft_wrapped: impl Copy + Fn(usize) -> bool,
1988        cx: &mut WindowContext,
1989    ) -> Vec<LineWithInvisibles> {
1990        if rows.start >= rows.end {
1991            return Vec::new();
1992        }
1993
1994        // Show the placeholder when the editor is empty
1995        if snapshot.is_empty() {
1996            let font_size = style.text.font_size.to_pixels(cx.rem_size());
1997            let placeholder_color = cx.theme().colors().text_placeholder;
1998            let placeholder_text = snapshot.placeholder_text();
1999
2000            let placeholder_lines = placeholder_text
2001                .as_ref()
2002                .map_or("", AsRef::as_ref)
2003                .split('\n')
2004                .skip(rows.start.0 as usize)
2005                .chain(iter::repeat(""))
2006                .take(rows.len());
2007            placeholder_lines
2008                .filter_map(move |line| {
2009                    let run = TextRun {
2010                        len: line.len(),
2011                        font: style.text.font(),
2012                        color: placeholder_color,
2013                        background_color: None,
2014                        underline: Default::default(),
2015                        strikethrough: None,
2016                    };
2017                    cx.text_system()
2018                        .shape_line(line.to_string().into(), font_size, &[run])
2019                        .log_err()
2020                })
2021                .map(|line| LineWithInvisibles {
2022                    width: line.width,
2023                    len: line.len,
2024                    fragments: smallvec![LineFragment::Text(line)],
2025                    invisibles: Vec::new(),
2026                    font_size,
2027                })
2028                .collect()
2029        } else {
2030            let chunks = snapshot.highlighted_chunks(rows.clone(), true, style);
2031            LineWithInvisibles::from_chunks(
2032                chunks,
2033                &style,
2034                MAX_LINE_LEN,
2035                rows.len(),
2036                snapshot.mode,
2037                editor_width,
2038                is_row_soft_wrapped,
2039                cx,
2040            )
2041        }
2042    }
2043
2044    fn prepaint_lines(
2045        &self,
2046        start_row: DisplayRow,
2047        line_layouts: &mut [LineWithInvisibles],
2048        line_height: Pixels,
2049        scroll_pixel_position: gpui::Point<Pixels>,
2050        content_origin: gpui::Point<Pixels>,
2051        cx: &mut WindowContext,
2052    ) -> SmallVec<[AnyElement; 1]> {
2053        let mut line_elements = SmallVec::new();
2054        for (ix, line) in line_layouts.iter_mut().enumerate() {
2055            let row = start_row + DisplayRow(ix as u32);
2056            line.prepaint(
2057                line_height,
2058                scroll_pixel_position,
2059                row,
2060                content_origin,
2061                &mut line_elements,
2062                cx,
2063            );
2064        }
2065        line_elements
2066    }
2067
2068    #[allow(clippy::too_many_arguments)]
2069    fn render_block(
2070        &self,
2071        block: &Block,
2072        available_width: AvailableSpace,
2073        block_id: BlockId,
2074        block_row_start: DisplayRow,
2075        snapshot: &EditorSnapshot,
2076        text_x: Pixels,
2077        rows: &Range<DisplayRow>,
2078        line_layouts: &[LineWithInvisibles],
2079        gutter_dimensions: &GutterDimensions,
2080        line_height: Pixels,
2081        em_width: Pixels,
2082        text_hitbox: &Hitbox,
2083        editor_width: Pixels,
2084        scroll_width: &mut Pixels,
2085        resized_blocks: &mut HashMap<CustomBlockId, u32>,
2086        selections: &[Selection<Point>],
2087        is_row_soft_wrapped: impl Copy + Fn(usize) -> bool,
2088        cx: &mut WindowContext,
2089    ) -> (AnyElement, Size<Pixels>) {
2090        let mut element = match block {
2091            Block::Custom(block) => {
2092                let block_start = block.start().to_point(&snapshot.buffer_snapshot);
2093                let block_end = block.end().to_point(&snapshot.buffer_snapshot);
2094                let align_to = block_start.to_display_point(snapshot);
2095                let anchor_x = text_x
2096                    + if rows.contains(&align_to.row()) {
2097                        line_layouts[align_to.row().minus(rows.start) as usize]
2098                            .x_for_index(align_to.column() as usize)
2099                    } else {
2100                        layout_line(
2101                            align_to.row(),
2102                            snapshot,
2103                            &self.style,
2104                            editor_width,
2105                            is_row_soft_wrapped,
2106                            cx,
2107                        )
2108                        .x_for_index(align_to.column() as usize)
2109                    };
2110
2111                let selected = selections
2112                    .binary_search_by(|selection| {
2113                        if selection.end <= block_start {
2114                            Ordering::Less
2115                        } else if selection.start >= block_end {
2116                            Ordering::Greater
2117                        } else {
2118                            Ordering::Equal
2119                        }
2120                    })
2121                    .is_ok();
2122
2123                div()
2124                    .size_full()
2125                    .child(block.render(&mut BlockContext {
2126                        context: cx,
2127                        anchor_x,
2128                        gutter_dimensions,
2129                        line_height,
2130                        em_width,
2131                        block_id,
2132                        selected,
2133                        max_width: text_hitbox.size.width.max(*scroll_width),
2134                        editor_style: &self.style,
2135                    }))
2136                    .into_any()
2137            }
2138
2139            Block::ExcerptBoundary {
2140                prev_excerpt,
2141                next_excerpt,
2142                show_excerpt_controls,
2143                starts_new_buffer,
2144                height,
2145                ..
2146            } => {
2147                let icon_offset = gutter_dimensions.width
2148                    - (gutter_dimensions.left_padding + gutter_dimensions.margin);
2149
2150                let header_padding = px(6.0);
2151
2152                let mut result = v_flex().id(block_id).w_full();
2153
2154                if let Some(prev_excerpt) = prev_excerpt {
2155                    if *show_excerpt_controls {
2156                        result = result.child(
2157                            h_flex()
2158                                .w(icon_offset)
2159                                .h(MULTI_BUFFER_EXCERPT_HEADER_HEIGHT as f32 * cx.line_height())
2160                                .flex_none()
2161                                .justify_end()
2162                                .child(self.render_expand_excerpt_button(
2163                                    prev_excerpt.id,
2164                                    ExpandExcerptDirection::Down,
2165                                    IconName::ArrowDownFromLine,
2166                                    cx,
2167                                )),
2168                        );
2169                    }
2170                }
2171
2172                if let Some(next_excerpt) = next_excerpt {
2173                    let buffer = &next_excerpt.buffer;
2174                    let range = &next_excerpt.range;
2175                    let jump_data = {
2176                        let jump_path =
2177                            project::File::from_dyn(buffer.file()).map(|file| ProjectPath {
2178                                worktree_id: file.worktree_id(cx),
2179                                path: file.path.clone(),
2180                            });
2181                        let jump_anchor = range
2182                            .primary
2183                            .as_ref()
2184                            .map_or(range.context.start, |primary| primary.start);
2185
2186                        let excerpt_start = range.context.start;
2187                        let jump_position = language::ToPoint::to_point(&jump_anchor, buffer);
2188                        let offset_from_excerpt_start = if jump_anchor == excerpt_start {
2189                            0
2190                        } else {
2191                            let excerpt_start_row =
2192                                language::ToPoint::to_point(&jump_anchor, buffer).row;
2193                            jump_position.row - excerpt_start_row
2194                        };
2195                        let line_offset_from_top =
2196                            block_row_start.0 + *height + offset_from_excerpt_start
2197                                - snapshot
2198                                    .scroll_anchor
2199                                    .scroll_position(&snapshot.display_snapshot)
2200                                    .y as u32;
2201                        JumpData {
2202                            excerpt_id: next_excerpt.id,
2203                            anchor: jump_anchor,
2204                            position: language::ToPoint::to_point(&jump_anchor, buffer),
2205                            path: jump_path,
2206                            line_offset_from_top,
2207                        }
2208                    };
2209
2210                    if *starts_new_buffer {
2211                        let include_root = self
2212                            .editor
2213                            .read(cx)
2214                            .project
2215                            .as_ref()
2216                            .map(|project| project.read(cx).visible_worktrees(cx).count() > 1)
2217                            .unwrap_or_default();
2218                        let path = buffer.resolve_file_path(cx, include_root);
2219                        let filename = path
2220                            .as_ref()
2221                            .and_then(|path| Some(path.file_name()?.to_string_lossy().to_string()));
2222                        let parent_path = path.as_ref().and_then(|path| {
2223                            Some(path.parent()?.to_string_lossy().to_string() + "/")
2224                        });
2225
2226                        result = result.child(
2227                            div()
2228                                .px(header_padding)
2229                                .pt(header_padding)
2230                                .w_full()
2231                                .h(FILE_HEADER_HEIGHT as f32 * cx.line_height())
2232                                .child(
2233                                    h_flex()
2234                                        .id("path header block")
2235                                        .size_full()
2236                                        .flex_basis(Length::Definite(DefiniteLength::Fraction(
2237                                            0.667,
2238                                        )))
2239                                        .px(gpui::px(12.))
2240                                        .rounded_md()
2241                                        .shadow_md()
2242                                        .border_1()
2243                                        .border_color(cx.theme().colors().border)
2244                                        .bg(cx.theme().colors().editor_subheader_background)
2245                                        .justify_between()
2246                                        .hover(|style| style.bg(cx.theme().colors().element_hover))
2247                                        .child(
2248                                            h_flex().gap_3().child(
2249                                                h_flex()
2250                                                    .gap_2()
2251                                                    .child(
2252                                                        filename
2253                                                            .map(SharedString::from)
2254                                                            .unwrap_or_else(|| "untitled".into()),
2255                                                    )
2256                                                    .when_some(parent_path, |then, path| {
2257                                                        then.child(div().child(path).text_color(
2258                                                            cx.theme().colors().text_muted,
2259                                                        ))
2260                                                    }),
2261                                            ),
2262                                        )
2263                                        .child(Icon::new(IconName::ArrowUpRight))
2264                                        .cursor_pointer()
2265                                        .tooltip(|cx| {
2266                                            Tooltip::for_action("Jump to File", &OpenExcerpts, cx)
2267                                        })
2268                                        .on_mouse_down(MouseButton::Left, |_, cx| {
2269                                            cx.stop_propagation()
2270                                        })
2271                                        .on_click(cx.listener_for(&self.editor, {
2272                                            move |editor, e: &ClickEvent, cx| {
2273                                                editor.open_excerpts_common(
2274                                                    Some(jump_data.clone()),
2275                                                    e.down.modifiers.secondary(),
2276                                                    cx,
2277                                                );
2278                                            }
2279                                        })),
2280                                ),
2281                        );
2282                        if *show_excerpt_controls {
2283                            result = result.child(
2284                                h_flex()
2285                                    .w(icon_offset)
2286                                    .h(MULTI_BUFFER_EXCERPT_HEADER_HEIGHT as f32 * cx.line_height())
2287                                    .flex_none()
2288                                    .justify_end()
2289                                    .child(self.render_expand_excerpt_button(
2290                                        next_excerpt.id,
2291                                        ExpandExcerptDirection::Up,
2292                                        IconName::ArrowUpFromLine,
2293                                        cx,
2294                                    )),
2295                            );
2296                        }
2297                    } else {
2298                        let editor = self.editor.clone();
2299                        result = result.child(
2300                            h_flex()
2301                                .id("excerpt header block")
2302                                .group("excerpt-jump-action")
2303                                .justify_start()
2304                                .w_full()
2305                                .h(MULTI_BUFFER_EXCERPT_HEADER_HEIGHT as f32 * cx.line_height())
2306                                .relative()
2307                                .child(
2308                                    div()
2309                                        .top(px(0.))
2310                                        .absolute()
2311                                        .w_full()
2312                                        .h_px()
2313                                        .bg(cx.theme().colors().border_variant)
2314                                        .group_hover("excerpt-jump-action", |style| {
2315                                            style.bg(cx.theme().colors().border)
2316                                        }),
2317                                )
2318                                .cursor_pointer()
2319                                .on_click({
2320                                    let jump_data = jump_data.clone();
2321                                    cx.listener_for(&self.editor, {
2322                                        let jump_data = jump_data.clone();
2323                                        move |editor, e: &ClickEvent, cx| {
2324                                            cx.stop_propagation();
2325                                            editor.open_excerpts_common(
2326                                                Some(jump_data.clone()),
2327                                                e.down.modifiers.secondary(),
2328                                                cx,
2329                                            );
2330                                        }
2331                                    })
2332                                })
2333                                .tooltip({
2334                                    let jump_data = jump_data.clone();
2335                                    move |cx| {
2336                                        let jump_message = format!(
2337                                            "Jump to {}:L{}",
2338                                            match &jump_data.path {
2339                                                Some(project_path) =>
2340                                                    project_path.path.display().to_string(),
2341                                                None => {
2342                                                    let editor = editor.read(cx);
2343                                                    editor
2344                                                        .file_at(jump_data.position, cx)
2345                                                        .map(|file| {
2346                                                            file.full_path(cx).display().to_string()
2347                                                        })
2348                                                        .or_else(|| {
2349                                                            Some(
2350                                                                editor
2351                                                                    .tab_description(0, cx)?
2352                                                                    .to_string(),
2353                                                            )
2354                                                        })
2355                                                        .unwrap_or_else(|| {
2356                                                            "Unknown buffer".to_string()
2357                                                        })
2358                                                }
2359                                            },
2360                                            jump_data.position.row + 1
2361                                        );
2362                                        Tooltip::for_action(jump_message, &OpenExcerpts, cx)
2363                                    }
2364                                })
2365                                .child(
2366                                    h_flex()
2367                                        .w(icon_offset)
2368                                        .h(MULTI_BUFFER_EXCERPT_HEADER_HEIGHT as f32
2369                                            * cx.line_height())
2370                                        .flex_none()
2371                                        .justify_end()
2372                                        .child(if *show_excerpt_controls {
2373                                            self.render_expand_excerpt_button(
2374                                                next_excerpt.id,
2375                                                ExpandExcerptDirection::Up,
2376                                                IconName::ArrowUpFromLine,
2377                                                cx,
2378                                            )
2379                                        } else {
2380                                            ButtonLike::new("jump-icon")
2381                                                .style(ButtonStyle::Transparent)
2382                                                .child(
2383                                                    svg()
2384                                                        .path(IconName::ArrowUpRight.path())
2385                                                        .size(IconSize::XSmall.rems())
2386                                                        .text_color(
2387                                                            cx.theme().colors().border_variant,
2388                                                        )
2389                                                        .group_hover(
2390                                                            "excerpt-jump-action",
2391                                                            |style| {
2392                                                                style.text_color(
2393                                                                    cx.theme().colors().border,
2394                                                                )
2395                                                            },
2396                                                        ),
2397                                                )
2398                                        }),
2399                                ),
2400                        );
2401                    }
2402                }
2403
2404                result.into_any()
2405            }
2406        };
2407
2408        // Discover the element's content height, then round up to the nearest multiple of line height.
2409        let preliminary_size =
2410            element.layout_as_root(size(available_width, AvailableSpace::MinContent), cx);
2411        let quantized_height = (preliminary_size.height / line_height).ceil() * line_height;
2412        let final_size = if preliminary_size.height == quantized_height {
2413            preliminary_size
2414        } else {
2415            element.layout_as_root(size(available_width, quantized_height.into()), cx)
2416        };
2417
2418        if let BlockId::Custom(custom_block_id) = block_id {
2419            if block.height() > 0 {
2420                let element_height_in_lines =
2421                    ((final_size.height / line_height).ceil() as u32).max(1);
2422                if element_height_in_lines != block.height() {
2423                    resized_blocks.insert(custom_block_id, element_height_in_lines);
2424                }
2425            }
2426        }
2427
2428        (element, final_size)
2429    }
2430
2431    fn render_expand_excerpt_button(
2432        &self,
2433        excerpt_id: ExcerptId,
2434        direction: ExpandExcerptDirection,
2435        icon: IconName,
2436        cx: &mut WindowContext,
2437    ) -> ButtonLike {
2438        ButtonLike::new("expand-icon")
2439            .style(ButtonStyle::Transparent)
2440            .child(
2441                svg()
2442                    .path(icon.path())
2443                    .size(IconSize::XSmall.rems())
2444                    .text_color(cx.theme().colors().editor_line_number)
2445                    .group("")
2446                    .hover(|style| style.text_color(cx.theme().colors().editor_active_line_number)),
2447            )
2448            .on_click(cx.listener_for(&self.editor, {
2449                move |editor, _, cx| {
2450                    editor.expand_excerpt(excerpt_id, direction, cx);
2451                }
2452            }))
2453            .tooltip({
2454                move |cx| Tooltip::for_action("Expand Excerpt", &ExpandExcerpts { lines: 0 }, cx)
2455            })
2456    }
2457
2458    #[allow(clippy::too_many_arguments)]
2459    fn render_blocks(
2460        &self,
2461        rows: Range<DisplayRow>,
2462        snapshot: &EditorSnapshot,
2463        hitbox: &Hitbox,
2464        text_hitbox: &Hitbox,
2465        editor_width: Pixels,
2466        scroll_width: &mut Pixels,
2467        gutter_dimensions: &GutterDimensions,
2468        em_width: Pixels,
2469        text_x: Pixels,
2470        line_height: Pixels,
2471        line_layouts: &[LineWithInvisibles],
2472        selections: &[Selection<Point>],
2473        is_row_soft_wrapped: impl Copy + Fn(usize) -> bool,
2474        cx: &mut WindowContext,
2475    ) -> Result<Vec<BlockLayout>, HashMap<CustomBlockId, u32>> {
2476        let (fixed_blocks, non_fixed_blocks) = snapshot
2477            .blocks_in_range(rows.clone())
2478            .partition::<Vec<_>, _>(|(_, block)| block.style() == BlockStyle::Fixed);
2479
2480        let mut focused_block = self
2481            .editor
2482            .update(cx, |editor, _| editor.take_focused_block());
2483        let mut fixed_block_max_width = Pixels::ZERO;
2484        let mut blocks = Vec::new();
2485        let mut resized_blocks = HashMap::default();
2486
2487        for (row, block) in fixed_blocks {
2488            let block_id = block.id();
2489
2490            if focused_block.as_ref().map_or(false, |b| b.id == block_id) {
2491                focused_block = None;
2492            }
2493
2494            let (element, element_size) = self.render_block(
2495                block,
2496                AvailableSpace::MinContent,
2497                block_id,
2498                row,
2499                snapshot,
2500                text_x,
2501                &rows,
2502                line_layouts,
2503                gutter_dimensions,
2504                line_height,
2505                em_width,
2506                text_hitbox,
2507                editor_width,
2508                scroll_width,
2509                &mut resized_blocks,
2510                selections,
2511                is_row_soft_wrapped,
2512                cx,
2513            );
2514            fixed_block_max_width = fixed_block_max_width.max(element_size.width + em_width);
2515            blocks.push(BlockLayout {
2516                id: block_id,
2517                row: Some(row),
2518                element,
2519                available_space: size(AvailableSpace::MinContent, element_size.height.into()),
2520                style: BlockStyle::Fixed,
2521            });
2522        }
2523        for (row, block) in non_fixed_blocks {
2524            let style = block.style();
2525            let width = match style {
2526                BlockStyle::Sticky => hitbox.size.width,
2527                BlockStyle::Flex => hitbox
2528                    .size
2529                    .width
2530                    .max(fixed_block_max_width)
2531                    .max(gutter_dimensions.width + *scroll_width),
2532                BlockStyle::Fixed => unreachable!(),
2533            };
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                width.into(),
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
2561            blocks.push(BlockLayout {
2562                id: block_id,
2563                row: Some(row),
2564                element,
2565                available_space: size(width.into(), element_size.height.into()),
2566                style,
2567            });
2568        }
2569
2570        if let Some(focused_block) = focused_block {
2571            if let Some(focus_handle) = focused_block.focus_handle.upgrade() {
2572                if focus_handle.is_focused(cx) {
2573                    if let Some(block) = snapshot.block_for_id(focused_block.id) {
2574                        let style = block.style();
2575                        let width = match style {
2576                            BlockStyle::Fixed => AvailableSpace::MinContent,
2577                            BlockStyle::Flex => AvailableSpace::Definite(
2578                                hitbox
2579                                    .size
2580                                    .width
2581                                    .max(fixed_block_max_width)
2582                                    .max(gutter_dimensions.width + *scroll_width),
2583                            ),
2584                            BlockStyle::Sticky => AvailableSpace::Definite(hitbox.size.width),
2585                        };
2586
2587                        let (element, element_size) = self.render_block(
2588                            &block,
2589                            width,
2590                            focused_block.id,
2591                            rows.end,
2592                            snapshot,
2593                            text_x,
2594                            &rows,
2595                            line_layouts,
2596                            gutter_dimensions,
2597                            line_height,
2598                            em_width,
2599                            text_hitbox,
2600                            editor_width,
2601                            scroll_width,
2602                            &mut resized_blocks,
2603                            selections,
2604                            is_row_soft_wrapped,
2605                            cx,
2606                        );
2607
2608                        blocks.push(BlockLayout {
2609                            id: block.id(),
2610                            row: None,
2611                            element,
2612                            available_space: size(width, element_size.height.into()),
2613                            style,
2614                        });
2615                    }
2616                }
2617            }
2618        }
2619
2620        if resized_blocks.is_empty() {
2621            *scroll_width = (*scroll_width).max(fixed_block_max_width - gutter_dimensions.width);
2622            Ok(blocks)
2623        } else {
2624            Err(resized_blocks)
2625        }
2626    }
2627
2628    /// Returns true if any of the blocks changed size since the previous frame. This will trigger
2629    /// a restart of rendering for the editor based on the new sizes.
2630    fn layout_blocks(
2631        &self,
2632        blocks: &mut Vec<BlockLayout>,
2633        block_starts: &mut HashSet<DisplayRow>,
2634        hitbox: &Hitbox,
2635        line_height: Pixels,
2636        scroll_pixel_position: gpui::Point<Pixels>,
2637        cx: &mut WindowContext,
2638    ) {
2639        for block in blocks {
2640            let mut origin = if let Some(row) = block.row {
2641                block_starts.insert(row);
2642                hitbox.origin
2643                    + point(
2644                        Pixels::ZERO,
2645                        row.as_f32() * line_height - scroll_pixel_position.y,
2646                    )
2647            } else {
2648                // Position the block outside the visible area
2649                hitbox.origin + point(Pixels::ZERO, hitbox.size.height)
2650            };
2651
2652            if !matches!(block.style, BlockStyle::Sticky) {
2653                origin += point(-scroll_pixel_position.x, Pixels::ZERO);
2654            }
2655
2656            let focus_handle = block
2657                .element
2658                .prepaint_as_root(origin, block.available_space, cx);
2659
2660            if let Some(focus_handle) = focus_handle {
2661                self.editor.update(cx, |editor, _cx| {
2662                    editor.set_focused_block(FocusedBlock {
2663                        id: block.id,
2664                        focus_handle: focus_handle.downgrade(),
2665                    });
2666                });
2667            }
2668        }
2669    }
2670
2671    #[allow(clippy::too_many_arguments)]
2672    fn layout_context_menu(
2673        &self,
2674        line_height: Pixels,
2675        hitbox: &Hitbox,
2676        text_hitbox: &Hitbox,
2677        content_origin: gpui::Point<Pixels>,
2678        start_row: DisplayRow,
2679        scroll_pixel_position: gpui::Point<Pixels>,
2680        line_layouts: &[LineWithInvisibles],
2681        newest_selection_head: DisplayPoint,
2682        gutter_overshoot: Pixels,
2683        cx: &mut WindowContext,
2684    ) -> bool {
2685        let max_height = cmp::min(
2686            12. * line_height,
2687            cmp::max(3. * line_height, (hitbox.size.height - line_height) / 2.),
2688        );
2689        let Some((position, mut context_menu)) = self.editor.update(cx, |editor, cx| {
2690            if editor.context_menu_visible() {
2691                editor.render_context_menu(newest_selection_head, &self.style, max_height, cx)
2692            } else {
2693                None
2694            }
2695        }) else {
2696            return false;
2697        };
2698
2699        let context_menu_size = context_menu.layout_as_root(AvailableSpace::min_size(), cx);
2700
2701        let (x, y) = match position {
2702            crate::ContextMenuOrigin::EditorPoint(point) => {
2703                let cursor_row_layout = &line_layouts[point.row().minus(start_row) as usize];
2704                let x = cursor_row_layout.x_for_index(point.column() as usize)
2705                    - scroll_pixel_position.x;
2706                let y = point.row().next_row().as_f32() * line_height - scroll_pixel_position.y;
2707                (x, y)
2708            }
2709            crate::ContextMenuOrigin::GutterIndicator(row) => {
2710                // 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
2711                // text field.
2712                let x = -gutter_overshoot;
2713                let y = row.next_row().as_f32() * line_height - scroll_pixel_position.y;
2714                (x, y)
2715            }
2716        };
2717
2718        let mut list_origin = content_origin + point(x, y);
2719        let list_width = context_menu_size.width;
2720        let list_height = context_menu_size.height;
2721
2722        // Snap the right edge of the list to the right edge of the window if
2723        // its horizontal bounds overflow.
2724        if list_origin.x + list_width > cx.viewport_size().width {
2725            list_origin.x = (cx.viewport_size().width - list_width).max(Pixels::ZERO);
2726        }
2727
2728        if list_origin.y + list_height > text_hitbox.lower_right().y {
2729            list_origin.y -= line_height + list_height;
2730        }
2731
2732        cx.defer_draw(context_menu, list_origin, 1);
2733        true
2734    }
2735
2736    #[allow(clippy::too_many_arguments)]
2737    fn layout_inline_completion_popover(
2738        &self,
2739        text_bounds: &Bounds<Pixels>,
2740        editor_snapshot: &EditorSnapshot,
2741        visible_row_range: Range<DisplayRow>,
2742        scroll_top: f32,
2743        scroll_bottom: f32,
2744        line_layouts: &[LineWithInvisibles],
2745        line_height: Pixels,
2746        scroll_pixel_position: gpui::Point<Pixels>,
2747        editor_width: Pixels,
2748        style: &EditorStyle,
2749        cx: &mut WindowContext,
2750    ) -> Option<AnyElement> {
2751        const PADDING_X: Pixels = Pixels(25.);
2752        const PADDING_Y: Pixels = Pixels(2.);
2753
2754        let active_inline_completion = self.editor.read(cx).active_inline_completion.as_ref()?;
2755
2756        match &active_inline_completion.completion {
2757            InlineCompletion::Move(target_position) => {
2758                let tab_kbd = h_flex()
2759                    .px_0p5()
2760                    .font(theme::ThemeSettings::get_global(cx).buffer_font.clone())
2761                    .text_size(TextSize::XSmall.rems(cx))
2762                    .text_color(cx.theme().colors().text.opacity(0.8))
2763                    .child("tab");
2764
2765                let icon_container = div().mt(px(2.5)); // For optical alignment
2766
2767                let container_element = h_flex()
2768                    .items_center()
2769                    .py_0p5()
2770                    .px_1()
2771                    .gap_1()
2772                    .bg(cx.theme().colors().editor_subheader_background)
2773                    .border_1()
2774                    .border_color(cx.theme().colors().text_accent.opacity(0.2))
2775                    .rounded_md()
2776                    .shadow_sm();
2777
2778                let target_display_point = target_position.to_display_point(editor_snapshot);
2779                if target_display_point.row().as_f32() < scroll_top {
2780                    let mut element = container_element
2781                        .child(tab_kbd)
2782                        .child(Label::new("Jump to Edit").size(LabelSize::Small))
2783                        .child(
2784                            icon_container
2785                                .child(Icon::new(IconName::ArrowUp).size(IconSize::Small)),
2786                        )
2787                        .into_any();
2788                    let size = element.layout_as_root(AvailableSpace::min_size(), cx);
2789                    let offset = point((text_bounds.size.width - size.width) / 2., PADDING_Y);
2790                    element.prepaint_at(text_bounds.origin + offset, cx);
2791                    Some(element)
2792                } else if (target_display_point.row().as_f32() + 1.) > scroll_bottom {
2793                    let mut element = container_element
2794                        .child(tab_kbd)
2795                        .child(Label::new("Jump to Edit").size(LabelSize::Small))
2796                        .child(
2797                            icon_container
2798                                .child(Icon::new(IconName::ArrowDown).size(IconSize::Small)),
2799                        )
2800                        .into_any();
2801                    let size = element.layout_as_root(AvailableSpace::min_size(), cx);
2802                    let offset = point(
2803                        (text_bounds.size.width - size.width) / 2.,
2804                        text_bounds.size.height - size.height - PADDING_Y,
2805                    );
2806                    element.prepaint_at(text_bounds.origin + offset, cx);
2807                    Some(element)
2808                } else {
2809                    let mut element = container_element
2810                        .child(tab_kbd)
2811                        .child(Label::new("Jump to Edit").size(LabelSize::Small))
2812                        .into_any();
2813
2814                    let target_line_end = DisplayPoint::new(
2815                        target_display_point.row(),
2816                        editor_snapshot.line_len(target_display_point.row()),
2817                    );
2818                    let origin = self.editor.update(cx, |editor, cx| {
2819                        editor.display_to_pixel_point(target_line_end, editor_snapshot, cx)
2820                    })?;
2821                    element.prepaint_as_root(
2822                        text_bounds.origin + origin + point(PADDING_X, px(0.)),
2823                        AvailableSpace::min_size(),
2824                        cx,
2825                    );
2826                    Some(element)
2827                }
2828            }
2829            InlineCompletion::Edit(edits) => {
2830                let edit_start = edits
2831                    .first()
2832                    .unwrap()
2833                    .0
2834                    .start
2835                    .to_display_point(editor_snapshot);
2836                let edit_end = edits
2837                    .last()
2838                    .unwrap()
2839                    .0
2840                    .end
2841                    .to_display_point(editor_snapshot);
2842
2843                let is_visible = visible_row_range.contains(&edit_start.row())
2844                    || visible_row_range.contains(&edit_end.row());
2845                if !is_visible {
2846                    return None;
2847                }
2848
2849                if all_edits_insertions_or_deletions(edits, &editor_snapshot.buffer_snapshot) {
2850                    return None;
2851                }
2852
2853                let (text, highlights) = inline_completion_popover_text(editor_snapshot, edits, cx);
2854
2855                let longest_row =
2856                    editor_snapshot.longest_row_in_range(edit_start.row()..edit_end.row() + 1);
2857                let longest_line_width = if visible_row_range.contains(&longest_row) {
2858                    line_layouts[(longest_row.0 - visible_row_range.start.0) as usize].width
2859                } else {
2860                    layout_line(
2861                        longest_row,
2862                        editor_snapshot,
2863                        style,
2864                        editor_width,
2865                        |_| false,
2866                        cx,
2867                    )
2868                    .width
2869                };
2870
2871                let text = gpui::StyledText::new(text).with_highlights(&style.text, highlights);
2872
2873                let mut element = div()
2874                    .bg(cx.theme().colors().editor_background)
2875                    .border_1()
2876                    .border_color(cx.theme().colors().border)
2877                    .rounded_md()
2878                    .px_1()
2879                    .child(text)
2880                    .into_any();
2881
2882                let origin = text_bounds.origin
2883                    + point(
2884                        longest_line_width + PADDING_X - scroll_pixel_position.x,
2885                        edit_start.row().as_f32() * line_height - scroll_pixel_position.y,
2886                    );
2887                element.prepaint_as_root(origin, AvailableSpace::min_size(), cx);
2888                Some(element)
2889            }
2890        }
2891    }
2892
2893    fn layout_mouse_context_menu(
2894        &self,
2895        editor_snapshot: &EditorSnapshot,
2896        visible_range: Range<DisplayRow>,
2897        content_origin: gpui::Point<Pixels>,
2898        cx: &mut WindowContext,
2899    ) -> Option<AnyElement> {
2900        let position = self.editor.update(cx, |editor, cx| {
2901            let visible_start_point = editor.display_to_pixel_point(
2902                DisplayPoint::new(visible_range.start, 0),
2903                editor_snapshot,
2904                cx,
2905            )?;
2906            let visible_end_point = editor.display_to_pixel_point(
2907                DisplayPoint::new(visible_range.end, 0),
2908                editor_snapshot,
2909                cx,
2910            )?;
2911
2912            let mouse_context_menu = editor.mouse_context_menu.as_ref()?;
2913            let (source_display_point, position) = match mouse_context_menu.position {
2914                MenuPosition::PinnedToScreen(point) => (None, point),
2915                MenuPosition::PinnedToEditor { source, offset } => {
2916                    let source_display_point = source.to_display_point(editor_snapshot);
2917                    let source_point = editor.to_pixel_point(source, editor_snapshot, cx)?;
2918                    let position = content_origin + source_point + offset;
2919                    (Some(source_display_point), position)
2920                }
2921            };
2922
2923            let source_included = source_display_point.map_or(true, |source_display_point| {
2924                visible_range
2925                    .to_inclusive()
2926                    .contains(&source_display_point.row())
2927            });
2928            let position_included =
2929                visible_start_point.y <= position.y && position.y <= visible_end_point.y;
2930            if !source_included && !position_included {
2931                None
2932            } else {
2933                Some(position)
2934            }
2935        })?;
2936
2937        let mut element = self.editor.update(cx, |editor, _| {
2938            let mouse_context_menu = editor.mouse_context_menu.as_ref()?;
2939            let context_menu = mouse_context_menu.context_menu.clone();
2940
2941            Some(
2942                deferred(
2943                    anchored()
2944                        .position(position)
2945                        .child(context_menu)
2946                        .anchor(AnchorCorner::TopLeft)
2947                        .snap_to_window_with_margin(px(8.)),
2948                )
2949                .with_priority(1)
2950                .into_any(),
2951            )
2952        })?;
2953
2954        element.prepaint_as_root(position, AvailableSpace::min_size(), cx);
2955        Some(element)
2956    }
2957
2958    #[allow(clippy::too_many_arguments)]
2959    fn layout_hover_popovers(
2960        &self,
2961        snapshot: &EditorSnapshot,
2962        hitbox: &Hitbox,
2963        text_hitbox: &Hitbox,
2964        visible_display_row_range: Range<DisplayRow>,
2965        content_origin: gpui::Point<Pixels>,
2966        scroll_pixel_position: gpui::Point<Pixels>,
2967        line_layouts: &[LineWithInvisibles],
2968        line_height: Pixels,
2969        em_width: Pixels,
2970        cx: &mut WindowContext,
2971    ) {
2972        struct MeasuredHoverPopover {
2973            element: AnyElement,
2974            size: Size<Pixels>,
2975            horizontal_offset: Pixels,
2976        }
2977
2978        let max_size = size(
2979            (120. * em_width) // Default size
2980                .min(hitbox.size.width / 2.) // Shrink to half of the editor width
2981                .max(MIN_POPOVER_CHARACTER_WIDTH * em_width), // Apply minimum width of 20 characters
2982            (16. * line_height) // Default size
2983                .min(hitbox.size.height / 2.) // Shrink to half of the editor height
2984                .max(MIN_POPOVER_LINE_HEIGHT * line_height), // Apply minimum height of 4 lines
2985        );
2986
2987        let hover_popovers = self.editor.update(cx, |editor, cx| {
2988            editor
2989                .hover_state
2990                .render(snapshot, visible_display_row_range.clone(), max_size, cx)
2991        });
2992        let Some((position, hover_popovers)) = hover_popovers else {
2993            return;
2994        };
2995
2996        // This is safe because we check on layout whether the required row is available
2997        let hovered_row_layout =
2998            &line_layouts[position.row().minus(visible_display_row_range.start) as usize];
2999
3000        // Compute Hovered Point
3001        let x =
3002            hovered_row_layout.x_for_index(position.column() as usize) - scroll_pixel_position.x;
3003        let y = position.row().as_f32() * line_height - scroll_pixel_position.y;
3004        let hovered_point = content_origin + point(x, y);
3005
3006        let mut overall_height = Pixels::ZERO;
3007        let mut measured_hover_popovers = Vec::new();
3008        for mut hover_popover in hover_popovers {
3009            let size = hover_popover.layout_as_root(AvailableSpace::min_size(), cx);
3010            let horizontal_offset =
3011                (text_hitbox.upper_right().x - (hovered_point.x + size.width)).min(Pixels::ZERO);
3012
3013            overall_height += HOVER_POPOVER_GAP + size.height;
3014
3015            measured_hover_popovers.push(MeasuredHoverPopover {
3016                element: hover_popover,
3017                size,
3018                horizontal_offset,
3019            });
3020        }
3021        overall_height += HOVER_POPOVER_GAP;
3022
3023        fn draw_occluder(width: Pixels, origin: gpui::Point<Pixels>, cx: &mut WindowContext) {
3024            let mut occlusion = div()
3025                .size_full()
3026                .occlude()
3027                .on_mouse_move(|_, cx| cx.stop_propagation())
3028                .into_any_element();
3029            occlusion.layout_as_root(size(width, HOVER_POPOVER_GAP).into(), cx);
3030            cx.defer_draw(occlusion, origin, 2);
3031        }
3032
3033        if hovered_point.y > overall_height {
3034            // There is enough space above. Render popovers above the hovered point
3035            let mut current_y = hovered_point.y;
3036            for (position, popover) in measured_hover_popovers.into_iter().with_position() {
3037                let size = popover.size;
3038                let popover_origin = point(
3039                    hovered_point.x + popover.horizontal_offset,
3040                    current_y - size.height,
3041                );
3042
3043                cx.defer_draw(popover.element, popover_origin, 2);
3044                if position != itertools::Position::Last {
3045                    let origin = point(popover_origin.x, popover_origin.y - HOVER_POPOVER_GAP);
3046                    draw_occluder(size.width, origin, cx);
3047                }
3048
3049                current_y = popover_origin.y - HOVER_POPOVER_GAP;
3050            }
3051        } else {
3052            // There is not enough space above. Render popovers below the hovered point
3053            let mut current_y = hovered_point.y + line_height;
3054            for (position, popover) in measured_hover_popovers.into_iter().with_position() {
3055                let size = popover.size;
3056                let popover_origin = point(hovered_point.x + popover.horizontal_offset, current_y);
3057
3058                cx.defer_draw(popover.element, popover_origin, 2);
3059                if position != itertools::Position::Last {
3060                    let origin = point(popover_origin.x, popover_origin.y + size.height);
3061                    draw_occluder(size.width, origin, cx);
3062                }
3063
3064                current_y = popover_origin.y + size.height + HOVER_POPOVER_GAP;
3065            }
3066        }
3067    }
3068
3069    #[allow(clippy::too_many_arguments)]
3070    fn layout_signature_help(
3071        &self,
3072        hitbox: &Hitbox,
3073        content_origin: gpui::Point<Pixels>,
3074        scroll_pixel_position: gpui::Point<Pixels>,
3075        newest_selection_head: Option<DisplayPoint>,
3076        start_row: DisplayRow,
3077        line_layouts: &[LineWithInvisibles],
3078        line_height: Pixels,
3079        em_width: Pixels,
3080        cx: &mut WindowContext,
3081    ) {
3082        if !self.editor.focus_handle(cx).is_focused(cx) {
3083            return;
3084        }
3085        let Some(newest_selection_head) = newest_selection_head else {
3086            return;
3087        };
3088        let selection_row = newest_selection_head.row();
3089        if selection_row < start_row {
3090            return;
3091        }
3092        let Some(cursor_row_layout) = line_layouts.get(selection_row.minus(start_row) as usize)
3093        else {
3094            return;
3095        };
3096
3097        let start_x = cursor_row_layout.x_for_index(newest_selection_head.column() as usize)
3098            - scroll_pixel_position.x
3099            + content_origin.x;
3100        let start_y =
3101            selection_row.as_f32() * line_height + content_origin.y - scroll_pixel_position.y;
3102
3103        let max_size = size(
3104            (120. * em_width) // Default size
3105                .min(hitbox.size.width / 2.) // Shrink to half of the editor width
3106                .max(MIN_POPOVER_CHARACTER_WIDTH * em_width), // Apply minimum width of 20 characters
3107            (16. * line_height) // Default size
3108                .min(hitbox.size.height / 2.) // Shrink to half of the editor height
3109                .max(MIN_POPOVER_LINE_HEIGHT * line_height), // Apply minimum height of 4 lines
3110        );
3111
3112        let maybe_element = self.editor.update(cx, |editor, cx| {
3113            if let Some(popover) = editor.signature_help_state.popover_mut() {
3114                let element = popover.render(
3115                    &self.style,
3116                    max_size,
3117                    editor.workspace.as_ref().map(|(w, _)| w.clone()),
3118                    cx,
3119                );
3120                Some(element)
3121            } else {
3122                None
3123            }
3124        });
3125        if let Some(mut element) = maybe_element {
3126            let window_size = cx.viewport_size();
3127            let size = element.layout_as_root(Size::<AvailableSpace>::default(), cx);
3128            let mut point = point(start_x, start_y - size.height);
3129
3130            // Adjusting to ensure the popover does not overflow in the X-axis direction.
3131            if point.x + size.width >= window_size.width {
3132                point.x = window_size.width - size.width;
3133            }
3134
3135            cx.defer_draw(element, point, 1)
3136        }
3137    }
3138
3139    fn paint_background(&self, layout: &EditorLayout, cx: &mut WindowContext) {
3140        cx.paint_layer(layout.hitbox.bounds, |cx| {
3141            let scroll_top = layout.position_map.snapshot.scroll_position().y;
3142            let gutter_bg = cx.theme().colors().editor_gutter_background;
3143            cx.paint_quad(fill(layout.gutter_hitbox.bounds, gutter_bg));
3144            cx.paint_quad(fill(layout.text_hitbox.bounds, self.style.background));
3145
3146            if let EditorMode::Full = layout.mode {
3147                let mut active_rows = layout.active_rows.iter().peekable();
3148                while let Some((start_row, contains_non_empty_selection)) = active_rows.next() {
3149                    let mut end_row = start_row.0;
3150                    while active_rows
3151                        .peek()
3152                        .map_or(false, |(active_row, has_selection)| {
3153                            active_row.0 == end_row + 1
3154                                && *has_selection == contains_non_empty_selection
3155                        })
3156                    {
3157                        active_rows.next().unwrap();
3158                        end_row += 1;
3159                    }
3160
3161                    if !contains_non_empty_selection {
3162                        let highlight_h_range =
3163                            match layout.position_map.snapshot.current_line_highlight {
3164                                CurrentLineHighlight::Gutter => Some(Range {
3165                                    start: layout.hitbox.left(),
3166                                    end: layout.gutter_hitbox.right(),
3167                                }),
3168                                CurrentLineHighlight::Line => Some(Range {
3169                                    start: layout.text_hitbox.bounds.left(),
3170                                    end: layout.text_hitbox.bounds.right(),
3171                                }),
3172                                CurrentLineHighlight::All => Some(Range {
3173                                    start: layout.hitbox.left(),
3174                                    end: layout.hitbox.right(),
3175                                }),
3176                                CurrentLineHighlight::None => None,
3177                            };
3178                        if let Some(range) = highlight_h_range {
3179                            let active_line_bg = cx.theme().colors().editor_active_line_background;
3180                            let bounds = Bounds {
3181                                origin: point(
3182                                    range.start,
3183                                    layout.hitbox.origin.y
3184                                        + (start_row.as_f32() - scroll_top)
3185                                            * layout.position_map.line_height,
3186                                ),
3187                                size: size(
3188                                    range.end - range.start,
3189                                    layout.position_map.line_height
3190                                        * (end_row - start_row.0 + 1) as f32,
3191                                ),
3192                            };
3193                            cx.paint_quad(fill(bounds, active_line_bg));
3194                        }
3195                    }
3196                }
3197
3198                let mut paint_highlight =
3199                    |highlight_row_start: DisplayRow, highlight_row_end: DisplayRow, color| {
3200                        let origin = point(
3201                            layout.hitbox.origin.x,
3202                            layout.hitbox.origin.y
3203                                + (highlight_row_start.as_f32() - scroll_top)
3204                                    * layout.position_map.line_height,
3205                        );
3206                        let size = size(
3207                            layout.hitbox.size.width,
3208                            layout.position_map.line_height
3209                                * highlight_row_end.next_row().minus(highlight_row_start) as f32,
3210                        );
3211                        cx.paint_quad(fill(Bounds { origin, size }, color));
3212                    };
3213
3214                let mut current_paint: Option<(Hsla, Range<DisplayRow>)> = None;
3215                for (&new_row, &new_color) in &layout.highlighted_rows {
3216                    match &mut current_paint {
3217                        Some((current_color, current_range)) => {
3218                            let current_color = *current_color;
3219                            let new_range_started = current_color != new_color
3220                                || current_range.end.next_row() != new_row;
3221                            if new_range_started {
3222                                paint_highlight(
3223                                    current_range.start,
3224                                    current_range.end,
3225                                    current_color,
3226                                );
3227                                current_paint = Some((new_color, new_row..new_row));
3228                                continue;
3229                            } else {
3230                                current_range.end = current_range.end.next_row();
3231                            }
3232                        }
3233                        None => current_paint = Some((new_color, new_row..new_row)),
3234                    };
3235                }
3236                if let Some((color, range)) = current_paint {
3237                    paint_highlight(range.start, range.end, color);
3238                }
3239
3240                let scroll_left =
3241                    layout.position_map.snapshot.scroll_position().x * layout.position_map.em_width;
3242
3243                for (wrap_position, active) in layout.wrap_guides.iter() {
3244                    let x = (layout.text_hitbox.origin.x
3245                        + *wrap_position
3246                        + layout.position_map.em_width / 2.)
3247                        - scroll_left;
3248
3249                    let show_scrollbars = layout
3250                        .scrollbar_layout
3251                        .as_ref()
3252                        .map_or(false, |scrollbar| scrollbar.visible);
3253                    if x < layout.text_hitbox.origin.x
3254                        || (show_scrollbars && x > self.scrollbar_left(&layout.hitbox.bounds))
3255                    {
3256                        continue;
3257                    }
3258
3259                    let color = if *active {
3260                        cx.theme().colors().editor_active_wrap_guide
3261                    } else {
3262                        cx.theme().colors().editor_wrap_guide
3263                    };
3264                    cx.paint_quad(fill(
3265                        Bounds {
3266                            origin: point(x, layout.text_hitbox.origin.y),
3267                            size: size(px(1.), layout.text_hitbox.size.height),
3268                        },
3269                        color,
3270                    ));
3271                }
3272            }
3273        })
3274    }
3275
3276    fn paint_indent_guides(&mut self, layout: &mut EditorLayout, cx: &mut WindowContext) {
3277        let Some(indent_guides) = &layout.indent_guides else {
3278            return;
3279        };
3280
3281        let faded_color = |color: Hsla, alpha: f32| {
3282            let mut faded = color;
3283            faded.a = alpha;
3284            faded
3285        };
3286
3287        for indent_guide in indent_guides {
3288            let indent_accent_colors = cx.theme().accents().color_for_index(indent_guide.depth);
3289            let settings = indent_guide.settings;
3290
3291            // TODO fixed for now, expose them through themes later
3292            const INDENT_AWARE_ALPHA: f32 = 0.2;
3293            const INDENT_AWARE_ACTIVE_ALPHA: f32 = 0.4;
3294            const INDENT_AWARE_BACKGROUND_ALPHA: f32 = 0.1;
3295            const INDENT_AWARE_BACKGROUND_ACTIVE_ALPHA: f32 = 0.2;
3296
3297            let line_color = match (settings.coloring, indent_guide.active) {
3298                (IndentGuideColoring::Disabled, _) => None,
3299                (IndentGuideColoring::Fixed, false) => {
3300                    Some(cx.theme().colors().editor_indent_guide)
3301                }
3302                (IndentGuideColoring::Fixed, true) => {
3303                    Some(cx.theme().colors().editor_indent_guide_active)
3304                }
3305                (IndentGuideColoring::IndentAware, false) => {
3306                    Some(faded_color(indent_accent_colors, INDENT_AWARE_ALPHA))
3307                }
3308                (IndentGuideColoring::IndentAware, true) => {
3309                    Some(faded_color(indent_accent_colors, INDENT_AWARE_ACTIVE_ALPHA))
3310                }
3311            };
3312
3313            let background_color = match (settings.background_coloring, indent_guide.active) {
3314                (IndentGuideBackgroundColoring::Disabled, _) => None,
3315                (IndentGuideBackgroundColoring::IndentAware, false) => Some(faded_color(
3316                    indent_accent_colors,
3317                    INDENT_AWARE_BACKGROUND_ALPHA,
3318                )),
3319                (IndentGuideBackgroundColoring::IndentAware, true) => Some(faded_color(
3320                    indent_accent_colors,
3321                    INDENT_AWARE_BACKGROUND_ACTIVE_ALPHA,
3322                )),
3323            };
3324
3325            let requested_line_width = if indent_guide.active {
3326                settings.active_line_width
3327            } else {
3328                settings.line_width
3329            }
3330            .clamp(1, 10);
3331            let mut line_indicator_width = 0.;
3332            if let Some(color) = line_color {
3333                cx.paint_quad(fill(
3334                    Bounds {
3335                        origin: indent_guide.origin,
3336                        size: size(px(requested_line_width as f32), indent_guide.length),
3337                    },
3338                    color,
3339                ));
3340                line_indicator_width = requested_line_width as f32;
3341            }
3342
3343            if let Some(color) = background_color {
3344                let width = indent_guide.single_indent_width - px(line_indicator_width);
3345                cx.paint_quad(fill(
3346                    Bounds {
3347                        origin: point(
3348                            indent_guide.origin.x + px(line_indicator_width),
3349                            indent_guide.origin.y,
3350                        ),
3351                        size: size(width, indent_guide.length),
3352                    },
3353                    color,
3354                ));
3355            }
3356        }
3357    }
3358
3359    fn paint_line_numbers(&mut self, layout: &mut EditorLayout, cx: &mut WindowContext) {
3360        let line_height = layout.position_map.line_height;
3361        let scroll_position = layout.position_map.snapshot.scroll_position();
3362        let scroll_top = scroll_position.y * line_height;
3363
3364        cx.set_cursor_style(CursorStyle::Arrow, &layout.gutter_hitbox);
3365
3366        for (ix, line) in layout.line_numbers.iter().enumerate() {
3367            if let Some(line) = line {
3368                let line_origin = layout.gutter_hitbox.origin
3369                    + point(
3370                        layout.gutter_hitbox.size.width
3371                            - line.width
3372                            - layout.gutter_dimensions.right_padding,
3373                        ix as f32 * line_height - (scroll_top % line_height),
3374                    );
3375
3376                line.paint(line_origin, line_height, cx).log_err();
3377            }
3378        }
3379    }
3380
3381    fn paint_diff_hunks(layout: &mut EditorLayout, cx: &mut WindowContext) {
3382        if layout.display_hunks.is_empty() {
3383            return;
3384        }
3385
3386        let line_height = layout.position_map.line_height;
3387        cx.paint_layer(layout.gutter_hitbox.bounds, |cx| {
3388            for (hunk, hitbox) in &layout.display_hunks {
3389                let hunk_to_paint = match hunk {
3390                    DisplayDiffHunk::Folded { .. } => {
3391                        let hunk_bounds = Self::diff_hunk_bounds(
3392                            &layout.position_map.snapshot,
3393                            line_height,
3394                            layout.gutter_hitbox.bounds,
3395                            hunk,
3396                        );
3397                        Some((
3398                            hunk_bounds,
3399                            cx.theme().status().modified,
3400                            Corners::all(px(0.)),
3401                        ))
3402                    }
3403                    DisplayDiffHunk::Unfolded { status, .. } => {
3404                        hitbox.as_ref().map(|hunk_hitbox| match status {
3405                            DiffHunkStatus::Added => (
3406                                hunk_hitbox.bounds,
3407                                cx.theme().status().created,
3408                                Corners::all(px(0.)),
3409                            ),
3410                            DiffHunkStatus::Modified => (
3411                                hunk_hitbox.bounds,
3412                                cx.theme().status().modified,
3413                                Corners::all(px(0.)),
3414                            ),
3415                            DiffHunkStatus::Removed => (
3416                                Bounds::new(
3417                                    point(
3418                                        hunk_hitbox.origin.x - hunk_hitbox.size.width,
3419                                        hunk_hitbox.origin.y,
3420                                    ),
3421                                    size(hunk_hitbox.size.width * px(2.), hunk_hitbox.size.height),
3422                                ),
3423                                cx.theme().status().deleted,
3424                                Corners::all(1. * line_height),
3425                            ),
3426                        })
3427                    }
3428                };
3429
3430                if let Some((hunk_bounds, background_color, corner_radii)) = hunk_to_paint {
3431                    cx.paint_quad(quad(
3432                        hunk_bounds,
3433                        corner_radii,
3434                        background_color,
3435                        Edges::default(),
3436                        transparent_black(),
3437                    ));
3438                }
3439            }
3440        });
3441    }
3442
3443    pub(super) fn diff_hunk_bounds(
3444        snapshot: &EditorSnapshot,
3445        line_height: Pixels,
3446        gutter_bounds: Bounds<Pixels>,
3447        hunk: &DisplayDiffHunk,
3448    ) -> Bounds<Pixels> {
3449        let scroll_position = snapshot.scroll_position();
3450        let scroll_top = scroll_position.y * line_height;
3451
3452        match hunk {
3453            DisplayDiffHunk::Folded { display_row, .. } => {
3454                let start_y = display_row.as_f32() * line_height - scroll_top;
3455                let end_y = start_y + line_height;
3456
3457                let width = Self::diff_hunk_strip_width(line_height);
3458                let highlight_origin = gutter_bounds.origin + point(px(0.), start_y);
3459                let highlight_size = size(width, end_y - start_y);
3460                Bounds::new(highlight_origin, highlight_size)
3461            }
3462            DisplayDiffHunk::Unfolded {
3463                display_row_range,
3464                status,
3465                ..
3466            } => match status {
3467                DiffHunkStatus::Added | DiffHunkStatus::Modified => {
3468                    let start_row = display_row_range.start;
3469                    let end_row = display_row_range.end;
3470                    // If we're in a multibuffer, row range span might include an
3471                    // excerpt header, so if we were to draw the marker straight away,
3472                    // the hunk might include the rows of that header.
3473                    // Making the range inclusive doesn't quite cut it, as we rely on the exclusivity for the soft wrap.
3474                    // Instead, we simply check whether the range we're dealing with includes
3475                    // any excerpt headers and if so, we stop painting the diff hunk on the first row of that header.
3476                    let end_row_in_current_excerpt = snapshot
3477                        .blocks_in_range(start_row..end_row)
3478                        .find_map(|(start_row, block)| {
3479                            if matches!(block, Block::ExcerptBoundary { .. }) {
3480                                Some(start_row)
3481                            } else {
3482                                None
3483                            }
3484                        })
3485                        .unwrap_or(end_row);
3486
3487                    let start_y = start_row.as_f32() * line_height - scroll_top;
3488                    let end_y = end_row_in_current_excerpt.as_f32() * line_height - scroll_top;
3489
3490                    let width = Self::diff_hunk_strip_width(line_height);
3491                    let highlight_origin = gutter_bounds.origin + point(px(0.), start_y);
3492                    let highlight_size = size(width, end_y - start_y);
3493                    Bounds::new(highlight_origin, highlight_size)
3494                }
3495                DiffHunkStatus::Removed => {
3496                    let row = display_row_range.start;
3497
3498                    let offset = line_height / 2.;
3499                    let start_y = row.as_f32() * line_height - offset - scroll_top;
3500                    let end_y = start_y + line_height;
3501
3502                    let width = (0.35 * line_height).floor();
3503                    let highlight_origin = gutter_bounds.origin + point(px(0.), start_y);
3504                    let highlight_size = size(width, end_y - start_y);
3505                    Bounds::new(highlight_origin, highlight_size)
3506                }
3507            },
3508        }
3509    }
3510
3511    /// Returns the width of the diff strip that will be displayed in the gutter.
3512    pub(super) fn diff_hunk_strip_width(line_height: Pixels) -> Pixels {
3513        // We floor the value to prevent pixel rounding.
3514        (0.275 * line_height).floor()
3515    }
3516
3517    fn paint_gutter_indicators(&self, layout: &mut EditorLayout, cx: &mut WindowContext) {
3518        cx.paint_layer(layout.gutter_hitbox.bounds, |cx| {
3519            cx.with_element_namespace("crease_toggles", |cx| {
3520                for crease_toggle in layout.crease_toggles.iter_mut().flatten() {
3521                    crease_toggle.paint(cx);
3522                }
3523            });
3524
3525            for test_indicator in layout.test_indicators.iter_mut() {
3526                test_indicator.paint(cx);
3527            }
3528
3529            if let Some(indicator) = layout.code_actions_indicator.as_mut() {
3530                indicator.paint(cx);
3531            }
3532        });
3533    }
3534
3535    fn paint_gutter_highlights(&self, layout: &mut EditorLayout, cx: &mut WindowContext) {
3536        for (_, hunk_hitbox) in &layout.display_hunks {
3537            if let Some(hunk_hitbox) = hunk_hitbox {
3538                cx.set_cursor_style(CursorStyle::PointingHand, hunk_hitbox);
3539            }
3540        }
3541
3542        let show_git_gutter = layout
3543            .position_map
3544            .snapshot
3545            .show_git_diff_gutter
3546            .unwrap_or_else(|| {
3547                matches!(
3548                    ProjectSettings::get_global(cx).git.git_gutter,
3549                    Some(GitGutterSetting::TrackedFiles)
3550                )
3551            });
3552        if show_git_gutter {
3553            Self::paint_diff_hunks(layout, cx)
3554        }
3555
3556        let highlight_width = 0.275 * layout.position_map.line_height;
3557        let highlight_corner_radii = Corners::all(0.05 * layout.position_map.line_height);
3558        cx.paint_layer(layout.gutter_hitbox.bounds, |cx| {
3559            for (range, color) in &layout.highlighted_gutter_ranges {
3560                let start_row = if range.start.row() < layout.visible_display_row_range.start {
3561                    layout.visible_display_row_range.start - DisplayRow(1)
3562                } else {
3563                    range.start.row()
3564                };
3565                let end_row = if range.end.row() > layout.visible_display_row_range.end {
3566                    layout.visible_display_row_range.end + DisplayRow(1)
3567                } else {
3568                    range.end.row()
3569                };
3570
3571                let start_y = layout.gutter_hitbox.top()
3572                    + start_row.0 as f32 * layout.position_map.line_height
3573                    - layout.position_map.scroll_pixel_position.y;
3574                let end_y = layout.gutter_hitbox.top()
3575                    + (end_row.0 + 1) as f32 * layout.position_map.line_height
3576                    - layout.position_map.scroll_pixel_position.y;
3577                let bounds = Bounds::from_corners(
3578                    point(layout.gutter_hitbox.left(), start_y),
3579                    point(layout.gutter_hitbox.left() + highlight_width, end_y),
3580                );
3581                cx.paint_quad(fill(bounds, *color).corner_radii(highlight_corner_radii));
3582            }
3583        });
3584    }
3585
3586    fn paint_blamed_display_rows(&self, layout: &mut EditorLayout, cx: &mut WindowContext) {
3587        let Some(blamed_display_rows) = layout.blamed_display_rows.take() else {
3588            return;
3589        };
3590
3591        cx.paint_layer(layout.gutter_hitbox.bounds, |cx| {
3592            for mut blame_element in blamed_display_rows.into_iter() {
3593                blame_element.paint(cx);
3594            }
3595        })
3596    }
3597
3598    fn paint_text(&mut self, layout: &mut EditorLayout, cx: &mut WindowContext) {
3599        cx.with_content_mask(
3600            Some(ContentMask {
3601                bounds: layout.text_hitbox.bounds,
3602            }),
3603            |cx| {
3604                let cursor_style = if self
3605                    .editor
3606                    .read(cx)
3607                    .hovered_link_state
3608                    .as_ref()
3609                    .is_some_and(|hovered_link_state| !hovered_link_state.links.is_empty())
3610                {
3611                    CursorStyle::PointingHand
3612                } else {
3613                    CursorStyle::IBeam
3614                };
3615                cx.set_cursor_style(cursor_style, &layout.text_hitbox);
3616
3617                let invisible_display_ranges = self.paint_highlights(layout, cx);
3618                self.paint_lines(&invisible_display_ranges, layout, cx);
3619                self.paint_redactions(layout, cx);
3620                self.paint_cursors(layout, cx);
3621                self.paint_inline_blame(layout, cx);
3622                cx.with_element_namespace("crease_trailers", |cx| {
3623                    for trailer in layout.crease_trailers.iter_mut().flatten() {
3624                        trailer.element.paint(cx);
3625                    }
3626                });
3627            },
3628        )
3629    }
3630
3631    fn paint_highlights(
3632        &mut self,
3633        layout: &mut EditorLayout,
3634        cx: &mut WindowContext,
3635    ) -> SmallVec<[Range<DisplayPoint>; 32]> {
3636        cx.paint_layer(layout.text_hitbox.bounds, |cx| {
3637            let mut invisible_display_ranges = SmallVec::<[Range<DisplayPoint>; 32]>::new();
3638            let line_end_overshoot = 0.15 * layout.position_map.line_height;
3639            for (range, color) in &layout.highlighted_ranges {
3640                self.paint_highlighted_range(
3641                    range.clone(),
3642                    *color,
3643                    Pixels::ZERO,
3644                    line_end_overshoot,
3645                    layout,
3646                    cx,
3647                );
3648            }
3649
3650            let corner_radius = 0.15 * layout.position_map.line_height;
3651
3652            for (player_color, selections) in &layout.selections {
3653                for selection in selections.iter() {
3654                    self.paint_highlighted_range(
3655                        selection.range.clone(),
3656                        player_color.selection,
3657                        corner_radius,
3658                        corner_radius * 2.,
3659                        layout,
3660                        cx,
3661                    );
3662
3663                    if selection.is_local && !selection.range.is_empty() {
3664                        invisible_display_ranges.push(selection.range.clone());
3665                    }
3666                }
3667            }
3668            invisible_display_ranges
3669        })
3670    }
3671
3672    fn paint_lines(
3673        &mut self,
3674        invisible_display_ranges: &[Range<DisplayPoint>],
3675        layout: &mut EditorLayout,
3676        cx: &mut WindowContext,
3677    ) {
3678        let whitespace_setting = self
3679            .editor
3680            .read(cx)
3681            .buffer
3682            .read(cx)
3683            .settings_at(0, cx)
3684            .show_whitespaces;
3685
3686        for (ix, line_with_invisibles) in layout.position_map.line_layouts.iter().enumerate() {
3687            let row = DisplayRow(layout.visible_display_row_range.start.0 + ix as u32);
3688            line_with_invisibles.draw(
3689                layout,
3690                row,
3691                layout.content_origin,
3692                whitespace_setting,
3693                invisible_display_ranges,
3694                cx,
3695            )
3696        }
3697
3698        for line_element in &mut layout.line_elements {
3699            line_element.paint(cx);
3700        }
3701    }
3702
3703    fn paint_redactions(&mut self, layout: &EditorLayout, cx: &mut WindowContext) {
3704        if layout.redacted_ranges.is_empty() {
3705            return;
3706        }
3707
3708        let line_end_overshoot = layout.line_end_overshoot();
3709
3710        // A softer than perfect black
3711        let redaction_color = gpui::rgb(0x0e1111);
3712
3713        cx.paint_layer(layout.text_hitbox.bounds, |cx| {
3714            for range in layout.redacted_ranges.iter() {
3715                self.paint_highlighted_range(
3716                    range.clone(),
3717                    redaction_color.into(),
3718                    Pixels::ZERO,
3719                    line_end_overshoot,
3720                    layout,
3721                    cx,
3722                );
3723            }
3724        });
3725    }
3726
3727    fn paint_cursors(&mut self, layout: &mut EditorLayout, cx: &mut WindowContext) {
3728        for cursor in &mut layout.visible_cursors {
3729            cursor.paint(layout.content_origin, cx);
3730        }
3731    }
3732
3733    fn paint_scrollbar(&mut self, layout: &mut EditorLayout, cx: &mut WindowContext) {
3734        let Some(scrollbar_layout) = layout.scrollbar_layout.as_ref() else {
3735            return;
3736        };
3737
3738        let thumb_bounds = scrollbar_layout.thumb_bounds();
3739        if scrollbar_layout.visible {
3740            cx.paint_layer(scrollbar_layout.hitbox.bounds, |cx| {
3741                cx.paint_quad(quad(
3742                    scrollbar_layout.hitbox.bounds,
3743                    Corners::default(),
3744                    cx.theme().colors().scrollbar_track_background,
3745                    Edges {
3746                        top: Pixels::ZERO,
3747                        right: Pixels::ZERO,
3748                        bottom: Pixels::ZERO,
3749                        left: ScrollbarLayout::BORDER_WIDTH,
3750                    },
3751                    cx.theme().colors().scrollbar_track_border,
3752                ));
3753
3754                let fast_markers =
3755                    self.collect_fast_scrollbar_markers(layout, scrollbar_layout, cx);
3756                // Refresh slow scrollbar markers in the background. Below, we paint whatever markers have already been computed.
3757                self.refresh_slow_scrollbar_markers(layout, scrollbar_layout, cx);
3758
3759                let markers = self.editor.read(cx).scrollbar_marker_state.markers.clone();
3760                for marker in markers.iter().chain(&fast_markers) {
3761                    let mut marker = marker.clone();
3762                    marker.bounds.origin += scrollbar_layout.hitbox.origin;
3763                    cx.paint_quad(marker);
3764                }
3765
3766                cx.paint_quad(quad(
3767                    thumb_bounds,
3768                    Corners::default(),
3769                    cx.theme().colors().scrollbar_thumb_background,
3770                    Edges {
3771                        top: Pixels::ZERO,
3772                        right: Pixels::ZERO,
3773                        bottom: Pixels::ZERO,
3774                        left: ScrollbarLayout::BORDER_WIDTH,
3775                    },
3776                    cx.theme().colors().scrollbar_thumb_border,
3777                ));
3778            });
3779        }
3780
3781        cx.set_cursor_style(CursorStyle::Arrow, &scrollbar_layout.hitbox);
3782
3783        let row_height = scrollbar_layout.row_height;
3784        let row_range = scrollbar_layout.visible_row_range.clone();
3785
3786        cx.on_mouse_event({
3787            let editor = self.editor.clone();
3788            let hitbox = scrollbar_layout.hitbox.clone();
3789            let mut mouse_position = cx.mouse_position();
3790            move |event: &MouseMoveEvent, phase, cx| {
3791                if phase == DispatchPhase::Capture {
3792                    return;
3793                }
3794
3795                editor.update(cx, |editor, cx| {
3796                    if event.pressed_button == Some(MouseButton::Left)
3797                        && editor.scroll_manager.is_dragging_scrollbar()
3798                    {
3799                        let y = mouse_position.y;
3800                        let new_y = event.position.y;
3801                        if (hitbox.top()..hitbox.bottom()).contains(&y) {
3802                            let mut position = editor.scroll_position(cx);
3803                            position.y += (new_y - y) / row_height;
3804                            if position.y < 0.0 {
3805                                position.y = 0.0;
3806                            }
3807                            editor.set_scroll_position(position, cx);
3808                        }
3809
3810                        cx.stop_propagation();
3811                    } else {
3812                        editor.scroll_manager.set_is_dragging_scrollbar(false, cx);
3813                        if hitbox.is_hovered(cx) {
3814                            editor.scroll_manager.show_scrollbar(cx);
3815                        }
3816                    }
3817                    mouse_position = event.position;
3818                })
3819            }
3820        });
3821
3822        if self.editor.read(cx).scroll_manager.is_dragging_scrollbar() {
3823            cx.on_mouse_event({
3824                let editor = self.editor.clone();
3825                move |_: &MouseUpEvent, phase, cx| {
3826                    if phase == DispatchPhase::Capture {
3827                        return;
3828                    }
3829
3830                    editor.update(cx, |editor, cx| {
3831                        editor.scroll_manager.set_is_dragging_scrollbar(false, cx);
3832                        cx.stop_propagation();
3833                    });
3834                }
3835            });
3836        } else {
3837            cx.on_mouse_event({
3838                let editor = self.editor.clone();
3839                let hitbox = scrollbar_layout.hitbox.clone();
3840                move |event: &MouseDownEvent, phase, cx| {
3841                    if phase == DispatchPhase::Capture || !hitbox.is_hovered(cx) {
3842                        return;
3843                    }
3844
3845                    editor.update(cx, |editor, cx| {
3846                        editor.scroll_manager.set_is_dragging_scrollbar(true, cx);
3847
3848                        let y = event.position.y;
3849                        if y < thumb_bounds.top() || thumb_bounds.bottom() < y {
3850                            let center_row = ((y - hitbox.top()) / row_height).round() as u32;
3851                            let top_row = center_row
3852                                .saturating_sub((row_range.end - row_range.start) as u32 / 2);
3853                            let mut position = editor.scroll_position(cx);
3854                            position.y = top_row as f32;
3855                            editor.set_scroll_position(position, cx);
3856                        } else {
3857                            editor.scroll_manager.show_scrollbar(cx);
3858                        }
3859
3860                        cx.stop_propagation();
3861                    });
3862                }
3863            });
3864        }
3865    }
3866
3867    fn collect_fast_scrollbar_markers(
3868        &self,
3869        layout: &EditorLayout,
3870        scrollbar_layout: &ScrollbarLayout,
3871        cx: &mut WindowContext,
3872    ) -> Vec<PaintQuad> {
3873        const LIMIT: usize = 100;
3874        if !EditorSettings::get_global(cx).scrollbar.cursors || layout.cursors.len() > LIMIT {
3875            return vec![];
3876        }
3877        let cursor_ranges = layout
3878            .cursors
3879            .iter()
3880            .map(|(point, color)| ColoredRange {
3881                start: point.row(),
3882                end: point.row(),
3883                color: *color,
3884            })
3885            .collect_vec();
3886        scrollbar_layout.marker_quads_for_ranges(cursor_ranges, None)
3887    }
3888
3889    fn refresh_slow_scrollbar_markers(
3890        &self,
3891        layout: &EditorLayout,
3892        scrollbar_layout: &ScrollbarLayout,
3893        cx: &mut WindowContext,
3894    ) {
3895        self.editor.update(cx, |editor, cx| {
3896            if !editor.is_singleton(cx)
3897                || !editor
3898                    .scrollbar_marker_state
3899                    .should_refresh(scrollbar_layout.hitbox.size)
3900            {
3901                return;
3902            }
3903
3904            let scrollbar_layout = scrollbar_layout.clone();
3905            let background_highlights = editor.background_highlights.clone();
3906            let snapshot = layout.position_map.snapshot.clone();
3907            let theme = cx.theme().clone();
3908            let scrollbar_settings = EditorSettings::get_global(cx).scrollbar;
3909
3910            editor.scrollbar_marker_state.dirty = false;
3911            editor.scrollbar_marker_state.pending_refresh =
3912                Some(cx.spawn(|editor, mut cx| async move {
3913                    let scrollbar_size = scrollbar_layout.hitbox.size;
3914                    let scrollbar_markers = cx
3915                        .background_executor()
3916                        .spawn(async move {
3917                            let max_point = snapshot.display_snapshot.buffer_snapshot.max_point();
3918                            let mut marker_quads = Vec::new();
3919                            if scrollbar_settings.git_diff {
3920                                let marker_row_ranges = snapshot
3921                                    .diff_map
3922                                    .diff_hunks(&snapshot.buffer_snapshot)
3923                                    .map(|hunk| {
3924                                        let start_display_row =
3925                                            MultiBufferPoint::new(hunk.row_range.start.0, 0)
3926                                                .to_display_point(&snapshot.display_snapshot)
3927                                                .row();
3928                                        let mut end_display_row =
3929                                            MultiBufferPoint::new(hunk.row_range.end.0, 0)
3930                                                .to_display_point(&snapshot.display_snapshot)
3931                                                .row();
3932                                        if end_display_row != start_display_row {
3933                                            end_display_row.0 -= 1;
3934                                        }
3935                                        let color = match hunk_status(&hunk) {
3936                                            DiffHunkStatus::Added => theme.status().created,
3937                                            DiffHunkStatus::Modified => theme.status().modified,
3938                                            DiffHunkStatus::Removed => theme.status().deleted,
3939                                        };
3940                                        ColoredRange {
3941                                            start: start_display_row,
3942                                            end: end_display_row,
3943                                            color,
3944                                        }
3945                                    });
3946
3947                                marker_quads.extend(
3948                                    scrollbar_layout
3949                                        .marker_quads_for_ranges(marker_row_ranges, Some(0)),
3950                                );
3951                            }
3952
3953                            for (background_highlight_id, (_, background_ranges)) in
3954                                background_highlights.iter()
3955                            {
3956                                let is_search_highlights = *background_highlight_id
3957                                    == TypeId::of::<BufferSearchHighlights>();
3958                                let is_symbol_occurrences = *background_highlight_id
3959                                    == TypeId::of::<DocumentHighlightRead>()
3960                                    || *background_highlight_id
3961                                        == TypeId::of::<DocumentHighlightWrite>();
3962                                if (is_search_highlights && scrollbar_settings.search_results)
3963                                    || (is_symbol_occurrences && scrollbar_settings.selected_symbol)
3964                                {
3965                                    let mut color = theme.status().info;
3966                                    if is_symbol_occurrences {
3967                                        color.fade_out(0.5);
3968                                    }
3969                                    let marker_row_ranges = background_ranges.iter().map(|range| {
3970                                        let display_start = range
3971                                            .start
3972                                            .to_display_point(&snapshot.display_snapshot);
3973                                        let display_end =
3974                                            range.end.to_display_point(&snapshot.display_snapshot);
3975                                        ColoredRange {
3976                                            start: display_start.row(),
3977                                            end: display_end.row(),
3978                                            color,
3979                                        }
3980                                    });
3981                                    marker_quads.extend(
3982                                        scrollbar_layout
3983                                            .marker_quads_for_ranges(marker_row_ranges, Some(1)),
3984                                    );
3985                                }
3986                            }
3987
3988                            if scrollbar_settings.diagnostics {
3989                                let diagnostics = snapshot
3990                                    .buffer_snapshot
3991                                    .diagnostics_in_range::<_, Point>(
3992                                        Point::zero()..max_point,
3993                                        false,
3994                                    )
3995                                    // We want to sort by severity, in order to paint the most severe diagnostics last.
3996                                    .sorted_by_key(|diagnostic| {
3997                                        std::cmp::Reverse(diagnostic.diagnostic.severity)
3998                                    });
3999
4000                                let marker_row_ranges = diagnostics.into_iter().map(|diagnostic| {
4001                                    let start_display = diagnostic
4002                                        .range
4003                                        .start
4004                                        .to_display_point(&snapshot.display_snapshot);
4005                                    let end_display = diagnostic
4006                                        .range
4007                                        .end
4008                                        .to_display_point(&snapshot.display_snapshot);
4009                                    let color = match diagnostic.diagnostic.severity {
4010                                        DiagnosticSeverity::ERROR => theme.status().error,
4011                                        DiagnosticSeverity::WARNING => theme.status().warning,
4012                                        DiagnosticSeverity::INFORMATION => theme.status().info,
4013                                        _ => theme.status().hint,
4014                                    };
4015                                    ColoredRange {
4016                                        start: start_display.row(),
4017                                        end: end_display.row(),
4018                                        color,
4019                                    }
4020                                });
4021                                marker_quads.extend(
4022                                    scrollbar_layout
4023                                        .marker_quads_for_ranges(marker_row_ranges, Some(2)),
4024                                );
4025                            }
4026
4027                            Arc::from(marker_quads)
4028                        })
4029                        .await;
4030
4031                    editor.update(&mut cx, |editor, cx| {
4032                        editor.scrollbar_marker_state.markers = scrollbar_markers;
4033                        editor.scrollbar_marker_state.scrollbar_size = scrollbar_size;
4034                        editor.scrollbar_marker_state.pending_refresh = None;
4035                        cx.notify();
4036                    })?;
4037
4038                    Ok(())
4039                }));
4040        });
4041    }
4042
4043    #[allow(clippy::too_many_arguments)]
4044    fn paint_highlighted_range(
4045        &self,
4046        range: Range<DisplayPoint>,
4047        color: Hsla,
4048        corner_radius: Pixels,
4049        line_end_overshoot: Pixels,
4050        layout: &EditorLayout,
4051        cx: &mut WindowContext,
4052    ) {
4053        let start_row = layout.visible_display_row_range.start;
4054        let end_row = layout.visible_display_row_range.end;
4055        if range.start != range.end {
4056            let row_range = if range.end.column() == 0 {
4057                cmp::max(range.start.row(), start_row)..cmp::min(range.end.row(), end_row)
4058            } else {
4059                cmp::max(range.start.row(), start_row)
4060                    ..cmp::min(range.end.row().next_row(), end_row)
4061            };
4062
4063            let highlighted_range = HighlightedRange {
4064                color,
4065                line_height: layout.position_map.line_height,
4066                corner_radius,
4067                start_y: layout.content_origin.y
4068                    + row_range.start.as_f32() * layout.position_map.line_height
4069                    - layout.position_map.scroll_pixel_position.y,
4070                lines: row_range
4071                    .iter_rows()
4072                    .map(|row| {
4073                        let line_layout =
4074                            &layout.position_map.line_layouts[row.minus(start_row) as usize];
4075                        HighlightedRangeLine {
4076                            start_x: if row == range.start.row() {
4077                                layout.content_origin.x
4078                                    + line_layout.x_for_index(range.start.column() as usize)
4079                                    - layout.position_map.scroll_pixel_position.x
4080                            } else {
4081                                layout.content_origin.x
4082                                    - layout.position_map.scroll_pixel_position.x
4083                            },
4084                            end_x: if row == range.end.row() {
4085                                layout.content_origin.x
4086                                    + line_layout.x_for_index(range.end.column() as usize)
4087                                    - layout.position_map.scroll_pixel_position.x
4088                            } else {
4089                                layout.content_origin.x + line_layout.width + line_end_overshoot
4090                                    - layout.position_map.scroll_pixel_position.x
4091                            },
4092                        }
4093                    })
4094                    .collect(),
4095            };
4096
4097            highlighted_range.paint(layout.text_hitbox.bounds, cx);
4098        }
4099    }
4100
4101    fn paint_inline_blame(&mut self, layout: &mut EditorLayout, cx: &mut WindowContext) {
4102        if let Some(mut inline_blame) = layout.inline_blame.take() {
4103            cx.paint_layer(layout.text_hitbox.bounds, |cx| {
4104                inline_blame.paint(cx);
4105            })
4106        }
4107    }
4108
4109    fn paint_blocks(&mut self, layout: &mut EditorLayout, cx: &mut WindowContext) {
4110        for mut block in layout.blocks.drain(..) {
4111            block.element.paint(cx);
4112        }
4113    }
4114
4115    fn paint_inline_completion_popover(
4116        &mut self,
4117        layout: &mut EditorLayout,
4118        cx: &mut WindowContext,
4119    ) {
4120        if let Some(inline_completion_popover) = layout.inline_completion_popover.as_mut() {
4121            inline_completion_popover.paint(cx);
4122        }
4123    }
4124
4125    fn paint_mouse_context_menu(&mut self, layout: &mut EditorLayout, cx: &mut WindowContext) {
4126        if let Some(mouse_context_menu) = layout.mouse_context_menu.as_mut() {
4127            mouse_context_menu.paint(cx);
4128        }
4129    }
4130
4131    fn paint_scroll_wheel_listener(&mut self, layout: &EditorLayout, cx: &mut WindowContext) {
4132        cx.on_mouse_event({
4133            let position_map = layout.position_map.clone();
4134            let editor = self.editor.clone();
4135            let hitbox = layout.hitbox.clone();
4136            let mut delta = ScrollDelta::default();
4137
4138            // Set a minimum scroll_sensitivity of 0.01 to make sure the user doesn't
4139            // accidentally turn off their scrolling.
4140            let scroll_sensitivity = EditorSettings::get_global(cx).scroll_sensitivity.max(0.01);
4141
4142            move |event: &ScrollWheelEvent, phase, cx| {
4143                if phase == DispatchPhase::Bubble && hitbox.is_hovered(cx) {
4144                    delta = delta.coalesce(event.delta);
4145                    editor.update(cx, |editor, cx| {
4146                        let position_map: &PositionMap = &position_map;
4147
4148                        let line_height = position_map.line_height;
4149                        let max_glyph_width = position_map.em_width;
4150                        let (delta, axis) = match delta {
4151                            gpui::ScrollDelta::Pixels(mut pixels) => {
4152                                //Trackpad
4153                                let axis = position_map.snapshot.ongoing_scroll.filter(&mut pixels);
4154                                (pixels, axis)
4155                            }
4156
4157                            gpui::ScrollDelta::Lines(lines) => {
4158                                //Not trackpad
4159                                let pixels =
4160                                    point(lines.x * max_glyph_width, lines.y * line_height);
4161                                (pixels, None)
4162                            }
4163                        };
4164
4165                        let current_scroll_position = position_map.snapshot.scroll_position();
4166                        let x = (current_scroll_position.x * max_glyph_width
4167                            - (delta.x * scroll_sensitivity))
4168                            / max_glyph_width;
4169                        let y = (current_scroll_position.y * line_height
4170                            - (delta.y * scroll_sensitivity))
4171                            / line_height;
4172                        let mut scroll_position =
4173                            point(x, y).clamp(&point(0., 0.), &position_map.scroll_max);
4174                        let forbid_vertical_scroll = editor.scroll_manager.forbid_vertical_scroll();
4175                        if forbid_vertical_scroll {
4176                            scroll_position.y = current_scroll_position.y;
4177                        }
4178
4179                        if scroll_position != current_scroll_position {
4180                            editor.scroll(scroll_position, axis, cx);
4181                            cx.stop_propagation();
4182                        } else if y < 0. {
4183                            // Due to clamping, we may fail to detect cases of overscroll to the top;
4184                            // We want the scroll manager to get an update in such cases and detect the change of direction
4185                            // on the next frame.
4186                            cx.notify();
4187                        }
4188                    });
4189                }
4190            }
4191        });
4192    }
4193
4194    fn paint_mouse_listeners(
4195        &mut self,
4196        layout: &EditorLayout,
4197        hovered_hunk: Option<HoveredHunk>,
4198        cx: &mut WindowContext,
4199    ) {
4200        self.paint_scroll_wheel_listener(layout, cx);
4201
4202        cx.on_mouse_event({
4203            let position_map = layout.position_map.clone();
4204            let editor = self.editor.clone();
4205            let text_hitbox = layout.text_hitbox.clone();
4206            let gutter_hitbox = layout.gutter_hitbox.clone();
4207
4208            move |event: &MouseDownEvent, phase, cx| {
4209                if phase == DispatchPhase::Bubble {
4210                    match event.button {
4211                        MouseButton::Left => editor.update(cx, |editor, cx| {
4212                            Self::mouse_left_down(
4213                                editor,
4214                                event,
4215                                hovered_hunk.clone(),
4216                                &position_map,
4217                                &text_hitbox,
4218                                &gutter_hitbox,
4219                                cx,
4220                            );
4221                        }),
4222                        MouseButton::Right => editor.update(cx, |editor, cx| {
4223                            Self::mouse_right_down(editor, event, &position_map, &text_hitbox, cx);
4224                        }),
4225                        MouseButton::Middle => editor.update(cx, |editor, cx| {
4226                            Self::mouse_middle_down(editor, event, &position_map, &text_hitbox, cx);
4227                        }),
4228                        _ => {}
4229                    };
4230                }
4231            }
4232        });
4233
4234        cx.on_mouse_event({
4235            let editor = self.editor.clone();
4236            let position_map = layout.position_map.clone();
4237            let text_hitbox = layout.text_hitbox.clone();
4238
4239            move |event: &MouseUpEvent, phase, cx| {
4240                if phase == DispatchPhase::Bubble {
4241                    editor.update(cx, |editor, cx| {
4242                        Self::mouse_up(editor, event, &position_map, &text_hitbox, cx)
4243                    });
4244                }
4245            }
4246        });
4247        cx.on_mouse_event({
4248            let position_map = layout.position_map.clone();
4249            let editor = self.editor.clone();
4250            let text_hitbox = layout.text_hitbox.clone();
4251            let gutter_hitbox = layout.gutter_hitbox.clone();
4252
4253            move |event: &MouseMoveEvent, phase, cx| {
4254                if phase == DispatchPhase::Bubble {
4255                    editor.update(cx, |editor, cx| {
4256                        if editor.hover_state.focused(cx) {
4257                            return;
4258                        }
4259                        if event.pressed_button == Some(MouseButton::Left)
4260                            || event.pressed_button == Some(MouseButton::Middle)
4261                        {
4262                            Self::mouse_dragged(
4263                                editor,
4264                                event,
4265                                &position_map,
4266                                text_hitbox.bounds,
4267                                cx,
4268                            )
4269                        }
4270
4271                        Self::mouse_moved(
4272                            editor,
4273                            event,
4274                            &position_map,
4275                            &text_hitbox,
4276                            &gutter_hitbox,
4277                            cx,
4278                        )
4279                    });
4280                }
4281            }
4282        });
4283    }
4284
4285    fn scrollbar_left(&self, bounds: &Bounds<Pixels>) -> Pixels {
4286        bounds.upper_right().x - self.style.scrollbar_width
4287    }
4288
4289    fn column_pixels(&self, column: usize, cx: &WindowContext) -> Pixels {
4290        let style = &self.style;
4291        let font_size = style.text.font_size.to_pixels(cx.rem_size());
4292        let layout = cx
4293            .text_system()
4294            .shape_line(
4295                SharedString::from(" ".repeat(column)),
4296                font_size,
4297                &[TextRun {
4298                    len: column,
4299                    font: style.text.font(),
4300                    color: Hsla::default(),
4301                    background_color: None,
4302                    underline: None,
4303                    strikethrough: None,
4304                }],
4305            )
4306            .unwrap();
4307
4308        layout.width
4309    }
4310
4311    fn max_line_number_width(&self, snapshot: &EditorSnapshot, cx: &WindowContext) -> Pixels {
4312        let digit_count = (snapshot.widest_line_number() as f32).log10().floor() as usize + 1;
4313        self.column_pixels(digit_count, cx)
4314    }
4315}
4316
4317fn inline_completion_popover_text(
4318    editor_snapshot: &EditorSnapshot,
4319    edits: &Vec<(Range<Anchor>, String)>,
4320    cx: &WindowContext,
4321) -> (String, Vec<(Range<usize>, HighlightStyle)>) {
4322    let edit_start = edits
4323        .first()
4324        .unwrap()
4325        .0
4326        .start
4327        .to_display_point(editor_snapshot);
4328
4329    let mut text = String::new();
4330    let mut offset = DisplayPoint::new(edit_start.row(), 0).to_offset(editor_snapshot, Bias::Left);
4331    let mut highlights = Vec::new();
4332    for (old_range, new_text) in edits {
4333        let old_offset_range = old_range.to_offset(&editor_snapshot.buffer_snapshot);
4334        text.extend(
4335            editor_snapshot
4336                .buffer_snapshot
4337                .chunks(offset..old_offset_range.start, false)
4338                .map(|chunk| chunk.text),
4339        );
4340        offset = old_offset_range.end;
4341
4342        let start = text.len();
4343        text.push_str(new_text);
4344        let end = text.len();
4345        highlights.push((
4346            start..end,
4347            HighlightStyle {
4348                background_color: Some(cx.theme().status().created_background),
4349                ..Default::default()
4350            },
4351        ));
4352    }
4353
4354    let edit_end = edits
4355        .last()
4356        .unwrap()
4357        .0
4358        .end
4359        .to_display_point(editor_snapshot);
4360    let end_of_line = DisplayPoint::new(edit_end.row(), editor_snapshot.line_len(edit_end.row()))
4361        .to_offset(editor_snapshot, Bias::Right);
4362    text.extend(
4363        editor_snapshot
4364            .buffer_snapshot
4365            .chunks(offset..end_of_line, false)
4366            .map(|chunk| chunk.text),
4367    );
4368
4369    (text, highlights)
4370}
4371
4372fn all_edits_insertions_or_deletions(
4373    edits: &Vec<(Range<Anchor>, String)>,
4374    snapshot: &MultiBufferSnapshot,
4375) -> bool {
4376    let mut all_insertions = true;
4377    let mut all_deletions = true;
4378
4379    for (range, new_text) in edits.iter() {
4380        let range_is_empty = range.to_offset(&snapshot).is_empty();
4381        let text_is_empty = new_text.is_empty();
4382
4383        if range_is_empty != text_is_empty {
4384            if range_is_empty {
4385                all_deletions = false;
4386            } else {
4387                all_insertions = false;
4388            }
4389        } else {
4390            return false;
4391        }
4392
4393        if !all_insertions && !all_deletions {
4394            return false;
4395        }
4396    }
4397    all_insertions || all_deletions
4398}
4399
4400#[allow(clippy::too_many_arguments)]
4401fn prepaint_gutter_button(
4402    button: IconButton,
4403    row: DisplayRow,
4404    line_height: Pixels,
4405    gutter_dimensions: &GutterDimensions,
4406    scroll_pixel_position: gpui::Point<Pixels>,
4407    gutter_hitbox: &Hitbox,
4408    rows_with_hunk_bounds: &HashMap<DisplayRow, Bounds<Pixels>>,
4409    cx: &mut WindowContext<'_>,
4410) -> AnyElement {
4411    let mut button = button.into_any_element();
4412    let available_space = size(
4413        AvailableSpace::MinContent,
4414        AvailableSpace::Definite(line_height),
4415    );
4416    let indicator_size = button.layout_as_root(available_space, cx);
4417
4418    let blame_width = gutter_dimensions.git_blame_entries_width;
4419    let gutter_width = rows_with_hunk_bounds
4420        .get(&row)
4421        .map(|bounds| bounds.size.width);
4422    let left_offset = blame_width.max(gutter_width).unwrap_or_default();
4423
4424    let mut x = left_offset;
4425    let available_width = gutter_dimensions.margin + gutter_dimensions.left_padding
4426        - indicator_size.width
4427        - left_offset;
4428    x += available_width / 2.;
4429
4430    let mut y = row.as_f32() * line_height - scroll_pixel_position.y;
4431    y += (line_height - indicator_size.height) / 2.;
4432
4433    button.prepaint_as_root(gutter_hitbox.origin + point(x, y), available_space, cx);
4434    button
4435}
4436
4437fn render_inline_blame_entry(
4438    blame: &gpui::Model<GitBlame>,
4439    blame_entry: BlameEntry,
4440    style: &EditorStyle,
4441    workspace: Option<WeakView<Workspace>>,
4442    cx: &mut WindowContext<'_>,
4443) -> AnyElement {
4444    let relative_timestamp = blame_entry_relative_timestamp(&blame_entry);
4445
4446    let author = blame_entry.author.as_deref().unwrap_or_default();
4447    let summary_enabled = ProjectSettings::get_global(cx)
4448        .git
4449        .show_inline_commit_summary();
4450
4451    let text = match blame_entry.summary.as_ref() {
4452        Some(summary) if summary_enabled => {
4453            format!("{}, {} - {}", author, relative_timestamp, summary)
4454        }
4455        _ => format!("{}, {}", author, relative_timestamp),
4456    };
4457
4458    let details = blame.read(cx).details_for_entry(&blame_entry);
4459
4460    let tooltip = cx.new_view(|_| BlameEntryTooltip::new(blame_entry, details, style, workspace));
4461
4462    h_flex()
4463        .id("inline-blame")
4464        .w_full()
4465        .font_family(style.text.font().family)
4466        .text_color(cx.theme().status().hint)
4467        .line_height(style.text.line_height)
4468        .child(Icon::new(IconName::FileGit).color(Color::Hint))
4469        .child(text)
4470        .gap_2()
4471        .hoverable_tooltip(move |_| tooltip.clone().into())
4472        .into_any()
4473}
4474
4475fn render_blame_entry(
4476    ix: usize,
4477    blame: &gpui::Model<GitBlame>,
4478    blame_entry: BlameEntry,
4479    style: &EditorStyle,
4480    last_used_color: &mut Option<(PlayerColor, Oid)>,
4481    editor: View<Editor>,
4482    cx: &mut WindowContext<'_>,
4483) -> AnyElement {
4484    let mut sha_color = cx
4485        .theme()
4486        .players()
4487        .color_for_participant(blame_entry.sha.into());
4488    // If the last color we used is the same as the one we get for this line, but
4489    // the commit SHAs are different, then we try again to get a different color.
4490    match *last_used_color {
4491        Some((color, sha)) if sha != blame_entry.sha && color.cursor == sha_color.cursor => {
4492            let index: u32 = blame_entry.sha.into();
4493            sha_color = cx.theme().players().color_for_participant(index + 1);
4494        }
4495        _ => {}
4496    };
4497    last_used_color.replace((sha_color, blame_entry.sha));
4498
4499    let relative_timestamp = blame_entry_relative_timestamp(&blame_entry);
4500
4501    let short_commit_id = blame_entry.sha.display_short();
4502
4503    let author_name = blame_entry.author.as_deref().unwrap_or("<no name>");
4504    let name = util::truncate_and_trailoff(author_name, GIT_BLAME_MAX_AUTHOR_CHARS_DISPLAYED);
4505
4506    let details = blame.read(cx).details_for_entry(&blame_entry);
4507
4508    let workspace = editor.read(cx).workspace.as_ref().map(|(w, _)| w.clone());
4509
4510    let tooltip = cx.new_view(|_| {
4511        BlameEntryTooltip::new(blame_entry.clone(), details.clone(), style, workspace)
4512    });
4513
4514    h_flex()
4515        .w_full()
4516        .justify_between()
4517        .font_family(style.text.font().family)
4518        .line_height(style.text.line_height)
4519        .id(("blame", ix))
4520        .text_color(cx.theme().status().hint)
4521        .pr_2()
4522        .gap_2()
4523        .child(
4524            h_flex()
4525                .items_center()
4526                .gap_2()
4527                .child(div().text_color(sha_color.cursor).child(short_commit_id))
4528                .child(name),
4529        )
4530        .child(relative_timestamp)
4531        .on_mouse_down(MouseButton::Right, {
4532            let blame_entry = blame_entry.clone();
4533            let details = details.clone();
4534            move |event, cx| {
4535                deploy_blame_entry_context_menu(
4536                    &blame_entry,
4537                    details.as_ref(),
4538                    editor.clone(),
4539                    event.position,
4540                    cx,
4541                );
4542            }
4543        })
4544        .hover(|style| style.bg(cx.theme().colors().element_hover))
4545        .when_some(
4546            details.and_then(|details| details.permalink),
4547            |this, url| {
4548                let url = url.clone();
4549                this.cursor_pointer().on_click(move |_, cx| {
4550                    cx.stop_propagation();
4551                    cx.open_url(url.as_str())
4552                })
4553            },
4554        )
4555        .hoverable_tooltip(move |_| tooltip.clone().into())
4556        .into_any()
4557}
4558
4559fn deploy_blame_entry_context_menu(
4560    blame_entry: &BlameEntry,
4561    details: Option<&CommitDetails>,
4562    editor: View<Editor>,
4563    position: gpui::Point<Pixels>,
4564    cx: &mut WindowContext<'_>,
4565) {
4566    let context_menu = ContextMenu::build(cx, move |menu, _| {
4567        let sha = format!("{}", blame_entry.sha);
4568        menu.on_blur_subscription(Subscription::new(|| {}))
4569            .entry("Copy commit SHA", None, move |cx| {
4570                cx.write_to_clipboard(ClipboardItem::new_string(sha.clone()));
4571            })
4572            .when_some(
4573                details.and_then(|details| details.permalink.clone()),
4574                |this, url| this.entry("Open permalink", None, move |cx| cx.open_url(url.as_str())),
4575            )
4576    });
4577
4578    editor.update(cx, move |editor, cx| {
4579        editor.mouse_context_menu = Some(MouseContextMenu::new(
4580            MenuPosition::PinnedToScreen(position),
4581            context_menu,
4582            cx,
4583        ));
4584        cx.notify();
4585    });
4586}
4587
4588#[derive(Debug)]
4589pub(crate) struct LineWithInvisibles {
4590    fragments: SmallVec<[LineFragment; 1]>,
4591    invisibles: Vec<Invisible>,
4592    len: usize,
4593    width: Pixels,
4594    font_size: Pixels,
4595}
4596
4597#[allow(clippy::large_enum_variant)]
4598enum LineFragment {
4599    Text(ShapedLine),
4600    Element {
4601        element: Option<AnyElement>,
4602        size: Size<Pixels>,
4603        len: usize,
4604    },
4605}
4606
4607impl fmt::Debug for LineFragment {
4608    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
4609        match self {
4610            LineFragment::Text(shaped_line) => f.debug_tuple("Text").field(shaped_line).finish(),
4611            LineFragment::Element { size, len, .. } => f
4612                .debug_struct("Element")
4613                .field("size", size)
4614                .field("len", len)
4615                .finish(),
4616        }
4617    }
4618}
4619
4620impl LineWithInvisibles {
4621    #[allow(clippy::too_many_arguments)]
4622    fn from_chunks<'a>(
4623        chunks: impl Iterator<Item = HighlightedChunk<'a>>,
4624        editor_style: &EditorStyle,
4625        max_line_len: usize,
4626        max_line_count: usize,
4627        editor_mode: EditorMode,
4628        text_width: Pixels,
4629        is_row_soft_wrapped: impl Copy + Fn(usize) -> bool,
4630        cx: &mut WindowContext,
4631    ) -> Vec<Self> {
4632        let text_style = &editor_style.text;
4633        let mut layouts = Vec::with_capacity(max_line_count);
4634        let mut fragments: SmallVec<[LineFragment; 1]> = SmallVec::new();
4635        let mut line = String::new();
4636        let mut invisibles = Vec::new();
4637        let mut width = Pixels::ZERO;
4638        let mut len = 0;
4639        let mut styles = Vec::new();
4640        let mut non_whitespace_added = false;
4641        let mut row = 0;
4642        let mut line_exceeded_max_len = false;
4643        let font_size = text_style.font_size.to_pixels(cx.rem_size());
4644
4645        let ellipsis = SharedString::from("⋯");
4646
4647        for highlighted_chunk in chunks.chain([HighlightedChunk {
4648            text: "\n",
4649            style: None,
4650            is_tab: false,
4651            replacement: None,
4652        }]) {
4653            if let Some(replacement) = highlighted_chunk.replacement {
4654                if !line.is_empty() {
4655                    let shaped_line = cx
4656                        .text_system()
4657                        .shape_line(line.clone().into(), font_size, &styles)
4658                        .unwrap();
4659                    width += shaped_line.width;
4660                    len += shaped_line.len;
4661                    fragments.push(LineFragment::Text(shaped_line));
4662                    line.clear();
4663                    styles.clear();
4664                }
4665
4666                match replacement {
4667                    ChunkReplacement::Renderer(renderer) => {
4668                        let available_width = if renderer.constrain_width {
4669                            let chunk = if highlighted_chunk.text == ellipsis.as_ref() {
4670                                ellipsis.clone()
4671                            } else {
4672                                SharedString::from(Arc::from(highlighted_chunk.text))
4673                            };
4674                            let shaped_line = cx
4675                                .text_system()
4676                                .shape_line(
4677                                    chunk,
4678                                    font_size,
4679                                    &[text_style.to_run(highlighted_chunk.text.len())],
4680                                )
4681                                .unwrap();
4682                            AvailableSpace::Definite(shaped_line.width)
4683                        } else {
4684                            AvailableSpace::MinContent
4685                        };
4686
4687                        let mut element = (renderer.render)(&mut ChunkRendererContext {
4688                            context: cx,
4689                            max_width: text_width,
4690                        });
4691                        let line_height = text_style.line_height_in_pixels(cx.rem_size());
4692                        let size = element.layout_as_root(
4693                            size(available_width, AvailableSpace::Definite(line_height)),
4694                            cx,
4695                        );
4696
4697                        width += size.width;
4698                        len += highlighted_chunk.text.len();
4699                        fragments.push(LineFragment::Element {
4700                            element: Some(element),
4701                            size,
4702                            len: highlighted_chunk.text.len(),
4703                        });
4704                    }
4705                    ChunkReplacement::Str(x) => {
4706                        let text_style = if let Some(style) = highlighted_chunk.style {
4707                            Cow::Owned(text_style.clone().highlight(style))
4708                        } else {
4709                            Cow::Borrowed(text_style)
4710                        };
4711
4712                        let run = TextRun {
4713                            len: x.len(),
4714                            font: text_style.font(),
4715                            color: text_style.color,
4716                            background_color: text_style.background_color,
4717                            underline: text_style.underline,
4718                            strikethrough: text_style.strikethrough,
4719                        };
4720                        let line_layout = cx
4721                            .text_system()
4722                            .shape_line(x, font_size, &[run])
4723                            .unwrap()
4724                            .with_len(highlighted_chunk.text.len());
4725
4726                        width += line_layout.width;
4727                        len += highlighted_chunk.text.len();
4728                        fragments.push(LineFragment::Text(line_layout))
4729                    }
4730                }
4731            } else {
4732                for (ix, mut line_chunk) in highlighted_chunk.text.split('\n').enumerate() {
4733                    if ix > 0 {
4734                        let shaped_line = cx
4735                            .text_system()
4736                            .shape_line(line.clone().into(), font_size, &styles)
4737                            .unwrap();
4738                        width += shaped_line.width;
4739                        len += shaped_line.len;
4740                        fragments.push(LineFragment::Text(shaped_line));
4741                        layouts.push(Self {
4742                            width: mem::take(&mut width),
4743                            len: mem::take(&mut len),
4744                            fragments: mem::take(&mut fragments),
4745                            invisibles: std::mem::take(&mut invisibles),
4746                            font_size,
4747                        });
4748
4749                        line.clear();
4750                        styles.clear();
4751                        row += 1;
4752                        line_exceeded_max_len = false;
4753                        non_whitespace_added = false;
4754                        if row == max_line_count {
4755                            return layouts;
4756                        }
4757                    }
4758
4759                    if !line_chunk.is_empty() && !line_exceeded_max_len {
4760                        let text_style = if let Some(style) = highlighted_chunk.style {
4761                            Cow::Owned(text_style.clone().highlight(style))
4762                        } else {
4763                            Cow::Borrowed(text_style)
4764                        };
4765
4766                        if line.len() + line_chunk.len() > max_line_len {
4767                            let mut chunk_len = max_line_len - line.len();
4768                            while !line_chunk.is_char_boundary(chunk_len) {
4769                                chunk_len -= 1;
4770                            }
4771                            line_chunk = &line_chunk[..chunk_len];
4772                            line_exceeded_max_len = true;
4773                        }
4774
4775                        styles.push(TextRun {
4776                            len: line_chunk.len(),
4777                            font: text_style.font(),
4778                            color: text_style.color,
4779                            background_color: text_style.background_color,
4780                            underline: text_style.underline,
4781                            strikethrough: text_style.strikethrough,
4782                        });
4783
4784                        if editor_mode == EditorMode::Full {
4785                            // Line wrap pads its contents with fake whitespaces,
4786                            // avoid printing them
4787                            let is_soft_wrapped = is_row_soft_wrapped(row);
4788                            if highlighted_chunk.is_tab {
4789                                if non_whitespace_added || !is_soft_wrapped {
4790                                    invisibles.push(Invisible::Tab {
4791                                        line_start_offset: line.len(),
4792                                        line_end_offset: line.len() + line_chunk.len(),
4793                                    });
4794                                }
4795                            } else {
4796                                invisibles.extend(
4797                                    line_chunk
4798                                        .bytes()
4799                                        .enumerate()
4800                                        .filter(|(_, line_byte)| {
4801                                            let is_whitespace =
4802                                                (*line_byte as char).is_whitespace();
4803                                            non_whitespace_added |= !is_whitespace;
4804                                            is_whitespace
4805                                                && (non_whitespace_added || !is_soft_wrapped)
4806                                        })
4807                                        .map(|(whitespace_index, _)| Invisible::Whitespace {
4808                                            line_offset: line.len() + whitespace_index,
4809                                        }),
4810                                )
4811                            }
4812                        }
4813
4814                        line.push_str(line_chunk);
4815                    }
4816                }
4817            }
4818        }
4819
4820        layouts
4821    }
4822
4823    fn prepaint(
4824        &mut self,
4825        line_height: Pixels,
4826        scroll_pixel_position: gpui::Point<Pixels>,
4827        row: DisplayRow,
4828        content_origin: gpui::Point<Pixels>,
4829        line_elements: &mut SmallVec<[AnyElement; 1]>,
4830        cx: &mut WindowContext,
4831    ) {
4832        let line_y = line_height * (row.as_f32() - scroll_pixel_position.y / line_height);
4833        let mut fragment_origin = content_origin + gpui::point(-scroll_pixel_position.x, line_y);
4834        for fragment in &mut self.fragments {
4835            match fragment {
4836                LineFragment::Text(line) => {
4837                    fragment_origin.x += line.width;
4838                }
4839                LineFragment::Element { element, size, .. } => {
4840                    let mut element = element
4841                        .take()
4842                        .expect("you can't prepaint LineWithInvisibles twice");
4843
4844                    // Center the element vertically within the line.
4845                    let mut element_origin = fragment_origin;
4846                    element_origin.y += (line_height - size.height) / 2.;
4847                    element.prepaint_at(element_origin, cx);
4848                    line_elements.push(element);
4849
4850                    fragment_origin.x += size.width;
4851                }
4852            }
4853        }
4854    }
4855
4856    fn draw(
4857        &self,
4858        layout: &EditorLayout,
4859        row: DisplayRow,
4860        content_origin: gpui::Point<Pixels>,
4861        whitespace_setting: ShowWhitespaceSetting,
4862        selection_ranges: &[Range<DisplayPoint>],
4863        cx: &mut WindowContext,
4864    ) {
4865        let line_height = layout.position_map.line_height;
4866        let line_y = line_height
4867            * (row.as_f32() - layout.position_map.scroll_pixel_position.y / line_height);
4868
4869        let mut fragment_origin =
4870            content_origin + gpui::point(-layout.position_map.scroll_pixel_position.x, line_y);
4871
4872        for fragment in &self.fragments {
4873            match fragment {
4874                LineFragment::Text(line) => {
4875                    line.paint(fragment_origin, line_height, cx).log_err();
4876                    fragment_origin.x += line.width;
4877                }
4878                LineFragment::Element { size, .. } => {
4879                    fragment_origin.x += size.width;
4880                }
4881            }
4882        }
4883
4884        self.draw_invisibles(
4885            selection_ranges,
4886            layout,
4887            content_origin,
4888            line_y,
4889            row,
4890            line_height,
4891            whitespace_setting,
4892            cx,
4893        );
4894    }
4895
4896    #[allow(clippy::too_many_arguments)]
4897    fn draw_invisibles(
4898        &self,
4899        selection_ranges: &[Range<DisplayPoint>],
4900        layout: &EditorLayout,
4901        content_origin: gpui::Point<Pixels>,
4902        line_y: Pixels,
4903        row: DisplayRow,
4904        line_height: Pixels,
4905        whitespace_setting: ShowWhitespaceSetting,
4906        cx: &mut WindowContext,
4907    ) {
4908        let extract_whitespace_info = |invisible: &Invisible| {
4909            let (token_offset, token_end_offset, invisible_symbol) = match invisible {
4910                Invisible::Tab {
4911                    line_start_offset,
4912                    line_end_offset,
4913                } => (*line_start_offset, *line_end_offset, &layout.tab_invisible),
4914                Invisible::Whitespace { line_offset } => {
4915                    (*line_offset, line_offset + 1, &layout.space_invisible)
4916                }
4917            };
4918
4919            let x_offset = self.x_for_index(token_offset);
4920            let invisible_offset =
4921                (layout.position_map.em_width - invisible_symbol.width).max(Pixels::ZERO) / 2.0;
4922            let origin = content_origin
4923                + gpui::point(
4924                    x_offset + invisible_offset - layout.position_map.scroll_pixel_position.x,
4925                    line_y,
4926                );
4927
4928            (
4929                [token_offset, token_end_offset],
4930                Box::new(move |cx: &mut WindowContext| {
4931                    invisible_symbol.paint(origin, line_height, cx).log_err();
4932                }),
4933            )
4934        };
4935
4936        let invisible_iter = self.invisibles.iter().map(extract_whitespace_info);
4937        match whitespace_setting {
4938            ShowWhitespaceSetting::None => (),
4939            ShowWhitespaceSetting::All => invisible_iter.for_each(|(_, paint)| paint(cx)),
4940            ShowWhitespaceSetting::Selection => invisible_iter.for_each(|([start, _], paint)| {
4941                let invisible_point = DisplayPoint::new(row, start as u32);
4942                if !selection_ranges
4943                    .iter()
4944                    .any(|region| region.start <= invisible_point && invisible_point < region.end)
4945                {
4946                    return;
4947                }
4948
4949                paint(cx);
4950            }),
4951
4952            // For a whitespace to be on a boundary, any of the following conditions need to be met:
4953            // - It is a tab
4954            // - It is adjacent to an edge (start or end)
4955            // - It is adjacent to a whitespace (left or right)
4956            ShowWhitespaceSetting::Boundary => {
4957                // 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
4958                // the above cases.
4959                // Note: We zip in the original `invisibles` to check for tab equality
4960                let mut last_seen: Option<(bool, usize, Box<dyn Fn(&mut WindowContext)>)> = None;
4961                for (([start, end], paint), invisible) in
4962                    invisible_iter.zip_eq(self.invisibles.iter())
4963                {
4964                    let should_render = match (&last_seen, invisible) {
4965                        (_, Invisible::Tab { .. }) => true,
4966                        (Some((_, last_end, _)), _) => *last_end == start,
4967                        _ => false,
4968                    };
4969
4970                    if should_render || start == 0 || end == self.len {
4971                        paint(cx);
4972
4973                        // Since we are scanning from the left, we will skip over the first available whitespace that is part
4974                        // of a boundary between non-whitespace segments, so we correct by manually redrawing it if needed.
4975                        if let Some((should_render_last, last_end, paint_last)) = last_seen {
4976                            // Note that we need to make sure that the last one is actually adjacent
4977                            if !should_render_last && last_end == start {
4978                                paint_last(cx);
4979                            }
4980                        }
4981                    }
4982
4983                    // Manually render anything within a selection
4984                    let invisible_point = DisplayPoint::new(row, start as u32);
4985                    if selection_ranges.iter().any(|region| {
4986                        region.start <= invisible_point && invisible_point < region.end
4987                    }) {
4988                        paint(cx);
4989                    }
4990
4991                    last_seen = Some((should_render, end, paint));
4992                }
4993            }
4994        }
4995    }
4996
4997    pub fn x_for_index(&self, index: usize) -> Pixels {
4998        let mut fragment_start_x = Pixels::ZERO;
4999        let mut fragment_start_index = 0;
5000
5001        for fragment in &self.fragments {
5002            match fragment {
5003                LineFragment::Text(shaped_line) => {
5004                    let fragment_end_index = fragment_start_index + shaped_line.len;
5005                    if index < fragment_end_index {
5006                        return fragment_start_x
5007                            + shaped_line.x_for_index(index - fragment_start_index);
5008                    }
5009                    fragment_start_x += shaped_line.width;
5010                    fragment_start_index = fragment_end_index;
5011                }
5012                LineFragment::Element { len, size, .. } => {
5013                    let fragment_end_index = fragment_start_index + len;
5014                    if index < fragment_end_index {
5015                        return fragment_start_x;
5016                    }
5017                    fragment_start_x += size.width;
5018                    fragment_start_index = fragment_end_index;
5019                }
5020            }
5021        }
5022
5023        fragment_start_x
5024    }
5025
5026    pub fn index_for_x(&self, x: Pixels) -> Option<usize> {
5027        let mut fragment_start_x = Pixels::ZERO;
5028        let mut fragment_start_index = 0;
5029
5030        for fragment in &self.fragments {
5031            match fragment {
5032                LineFragment::Text(shaped_line) => {
5033                    let fragment_end_x = fragment_start_x + shaped_line.width;
5034                    if x < fragment_end_x {
5035                        return Some(
5036                            fragment_start_index + shaped_line.index_for_x(x - fragment_start_x)?,
5037                        );
5038                    }
5039                    fragment_start_x = fragment_end_x;
5040                    fragment_start_index += shaped_line.len;
5041                }
5042                LineFragment::Element { len, size, .. } => {
5043                    let fragment_end_x = fragment_start_x + size.width;
5044                    if x < fragment_end_x {
5045                        return Some(fragment_start_index);
5046                    }
5047                    fragment_start_index += len;
5048                    fragment_start_x = fragment_end_x;
5049                }
5050            }
5051        }
5052
5053        None
5054    }
5055
5056    pub fn font_id_for_index(&self, index: usize) -> Option<FontId> {
5057        let mut fragment_start_index = 0;
5058
5059        for fragment in &self.fragments {
5060            match fragment {
5061                LineFragment::Text(shaped_line) => {
5062                    let fragment_end_index = fragment_start_index + shaped_line.len;
5063                    if index < fragment_end_index {
5064                        return shaped_line.font_id_for_index(index - fragment_start_index);
5065                    }
5066                    fragment_start_index = fragment_end_index;
5067                }
5068                LineFragment::Element { len, .. } => {
5069                    let fragment_end_index = fragment_start_index + len;
5070                    if index < fragment_end_index {
5071                        return None;
5072                    }
5073                    fragment_start_index = fragment_end_index;
5074                }
5075            }
5076        }
5077
5078        None
5079    }
5080}
5081
5082#[derive(Debug, Clone, Copy, PartialEq, Eq)]
5083enum Invisible {
5084    /// A tab character
5085    ///
5086    /// A tab character is internally represented by spaces (configured by the user's tab width)
5087    /// aligned to the nearest column, so it's necessary to store the start and end offset for
5088    /// adjacency checks.
5089    Tab {
5090        line_start_offset: usize,
5091        line_end_offset: usize,
5092    },
5093    Whitespace {
5094        line_offset: usize,
5095    },
5096}
5097
5098impl EditorElement {
5099    /// Returns the rem size to use when rendering the [`EditorElement`].
5100    ///
5101    /// This allows UI elements to scale based on the `buffer_font_size`.
5102    fn rem_size(&self, cx: &WindowContext) -> Option<Pixels> {
5103        match self.editor.read(cx).mode {
5104            EditorMode::Full => {
5105                let buffer_font_size = self.style.text.font_size;
5106                match buffer_font_size {
5107                    AbsoluteLength::Pixels(pixels) => {
5108                        let rem_size_scale = {
5109                            // Our default UI font size is 14px on a 16px base scale.
5110                            // This means the default UI font size is 0.875rems.
5111                            let default_font_size_scale = 14. / ui::BASE_REM_SIZE_IN_PX;
5112
5113                            // We then determine the delta between a single rem and the default font
5114                            // size scale.
5115                            let default_font_size_delta = 1. - default_font_size_scale;
5116
5117                            // Finally, we add this delta to 1rem to get the scale factor that
5118                            // should be used to scale up the UI.
5119                            1. + default_font_size_delta
5120                        };
5121
5122                        Some(pixels * rem_size_scale)
5123                    }
5124                    AbsoluteLength::Rems(rems) => {
5125                        Some(rems.to_pixels(ui::BASE_REM_SIZE_IN_PX.into()))
5126                    }
5127                }
5128            }
5129            // We currently use single-line and auto-height editors in UI contexts,
5130            // so we don't want to scale everything with the buffer font size, as it
5131            // ends up looking off.
5132            EditorMode::SingleLine { .. } | EditorMode::AutoHeight { .. } => None,
5133        }
5134    }
5135}
5136
5137impl Element for EditorElement {
5138    type RequestLayoutState = ();
5139    type PrepaintState = EditorLayout;
5140
5141    fn id(&self) -> Option<ElementId> {
5142        None
5143    }
5144
5145    fn request_layout(
5146        &mut self,
5147        _: Option<&GlobalElementId>,
5148        cx: &mut WindowContext,
5149    ) -> (gpui::LayoutId, ()) {
5150        let rem_size = self.rem_size(cx);
5151        cx.with_rem_size(rem_size, |cx| {
5152            self.editor.update(cx, |editor, cx| {
5153                editor.set_style(self.style.clone(), cx);
5154
5155                let layout_id = match editor.mode {
5156                    EditorMode::SingleLine { auto_width } => {
5157                        let rem_size = cx.rem_size();
5158
5159                        let height = self.style.text.line_height_in_pixels(rem_size);
5160                        if auto_width {
5161                            let editor_handle = cx.view().clone();
5162                            let style = self.style.clone();
5163                            cx.request_measured_layout(Style::default(), move |_, _, cx| {
5164                                let editor_snapshot =
5165                                    editor_handle.update(cx, |editor, cx| editor.snapshot(cx));
5166                                let line = Self::layout_lines(
5167                                    DisplayRow(0)..DisplayRow(1),
5168                                    &editor_snapshot,
5169                                    &style,
5170                                    px(f32::MAX),
5171                                    |_| false, // Single lines never soft wrap
5172                                    cx,
5173                                )
5174                                .pop()
5175                                .unwrap();
5176
5177                                let font_id = cx.text_system().resolve_font(&style.text.font());
5178                                let font_size = style.text.font_size.to_pixels(cx.rem_size());
5179                                let em_width = cx
5180                                    .text_system()
5181                                    .typographic_bounds(font_id, font_size, 'm')
5182                                    .unwrap()
5183                                    .size
5184                                    .width;
5185
5186                                size(line.width + em_width, height)
5187                            })
5188                        } else {
5189                            let mut style = Style::default();
5190                            style.size.height = height.into();
5191                            style.size.width = relative(1.).into();
5192                            cx.request_layout(style, None)
5193                        }
5194                    }
5195                    EditorMode::AutoHeight { max_lines } => {
5196                        let editor_handle = cx.view().clone();
5197                        let max_line_number_width =
5198                            self.max_line_number_width(&editor.snapshot(cx), cx);
5199                        cx.request_measured_layout(
5200                            Style::default(),
5201                            move |known_dimensions, available_space, cx| {
5202                                editor_handle
5203                                    .update(cx, |editor, cx| {
5204                                        compute_auto_height_layout(
5205                                            editor,
5206                                            max_lines,
5207                                            max_line_number_width,
5208                                            known_dimensions,
5209                                            available_space.width,
5210                                            cx,
5211                                        )
5212                                    })
5213                                    .unwrap_or_default()
5214                            },
5215                        )
5216                    }
5217                    EditorMode::Full => {
5218                        let mut style = Style::default();
5219                        style.size.width = relative(1.).into();
5220                        style.size.height = relative(1.).into();
5221                        cx.request_layout(style, None)
5222                    }
5223                };
5224
5225                (layout_id, ())
5226            })
5227        })
5228    }
5229
5230    fn prepaint(
5231        &mut self,
5232        _: Option<&GlobalElementId>,
5233        bounds: Bounds<Pixels>,
5234        _: &mut Self::RequestLayoutState,
5235        cx: &mut WindowContext,
5236    ) -> Self::PrepaintState {
5237        let text_style = TextStyleRefinement {
5238            font_size: Some(self.style.text.font_size),
5239            line_height: Some(self.style.text.line_height),
5240            ..Default::default()
5241        };
5242        let focus_handle = self.editor.focus_handle(cx);
5243        cx.set_view_id(self.editor.entity_id());
5244        cx.set_focus_handle(&focus_handle);
5245
5246        let rem_size = self.rem_size(cx);
5247        cx.with_rem_size(rem_size, |cx| {
5248            cx.with_text_style(Some(text_style), |cx| {
5249                cx.with_content_mask(Some(ContentMask { bounds }), |cx| {
5250                    let mut snapshot = self.editor.update(cx, |editor, cx| editor.snapshot(cx));
5251                    let style = self.style.clone();
5252
5253                    let font_id = cx.text_system().resolve_font(&style.text.font());
5254                    let font_size = style.text.font_size.to_pixels(cx.rem_size());
5255                    let line_height = style.text.line_height_in_pixels(cx.rem_size());
5256                    let em_width = cx
5257                        .text_system()
5258                        .typographic_bounds(font_id, font_size, 'm')
5259                        .unwrap()
5260                        .size
5261                        .width;
5262                    let em_advance = cx
5263                        .text_system()
5264                        .advance(font_id, font_size, 'm')
5265                        .unwrap()
5266                        .width;
5267
5268                    let gutter_dimensions = snapshot.gutter_dimensions(
5269                        font_id,
5270                        font_size,
5271                        em_width,
5272                        em_advance,
5273                        self.max_line_number_width(&snapshot, cx),
5274                        cx,
5275                    );
5276                    let text_width = bounds.size.width - gutter_dimensions.width;
5277
5278                    let right_margin = if snapshot.mode == EditorMode::Full {
5279                        EditorElement::SCROLLBAR_WIDTH
5280                    } else {
5281                        px(0.)
5282                    };
5283                    let overscroll = size(em_width + right_margin, px(0.));
5284
5285                    let editor_width =
5286                        text_width - gutter_dimensions.margin - overscroll.width - em_width;
5287
5288                    snapshot = self.editor.update(cx, |editor, cx| {
5289                        editor.last_bounds = Some(bounds);
5290                        editor.gutter_dimensions = gutter_dimensions;
5291                        editor.set_visible_line_count(bounds.size.height / line_height, cx);
5292
5293                        if matches!(editor.mode, EditorMode::AutoHeight { .. }) {
5294                            snapshot
5295                        } else {
5296                            let wrap_width = match editor.soft_wrap_mode(cx) {
5297                                SoftWrap::GitDiff => None,
5298                                SoftWrap::None => Some((MAX_LINE_LEN / 2) as f32 * em_advance),
5299                                SoftWrap::EditorWidth => Some(editor_width),
5300                                SoftWrap::Column(column) => Some(column as f32 * em_advance),
5301                                SoftWrap::Bounded(column) => {
5302                                    Some(editor_width.min(column as f32 * em_advance))
5303                                }
5304                            };
5305
5306                            if editor.set_wrap_width(wrap_width, cx) {
5307                                editor.snapshot(cx)
5308                            } else {
5309                                snapshot
5310                            }
5311                        }
5312                    });
5313
5314                    let wrap_guides = self
5315                        .editor
5316                        .read(cx)
5317                        .wrap_guides(cx)
5318                        .iter()
5319                        .map(|(guide, active)| (self.column_pixels(*guide, cx), *active))
5320                        .collect::<SmallVec<[_; 2]>>();
5321
5322                    let hitbox = cx.insert_hitbox(bounds, false);
5323                    let gutter_hitbox =
5324                        cx.insert_hitbox(gutter_bounds(bounds, gutter_dimensions), false);
5325                    let text_hitbox = cx.insert_hitbox(
5326                        Bounds {
5327                            origin: gutter_hitbox.upper_right(),
5328                            size: size(text_width, bounds.size.height),
5329                        },
5330                        false,
5331                    );
5332                    // Offset the content_bounds from the text_bounds by the gutter margin (which
5333                    // is roughly half a character wide) to make hit testing work more like how we want.
5334                    let content_origin =
5335                        text_hitbox.origin + point(gutter_dimensions.margin, Pixels::ZERO);
5336
5337                    let height_in_lines = bounds.size.height / line_height;
5338                    let max_row = snapshot.max_point().row().as_f32();
5339                    let max_scroll_top = if matches!(snapshot.mode, EditorMode::AutoHeight { .. }) {
5340                        (max_row - height_in_lines + 1.).max(0.)
5341                    } else {
5342                        let settings = EditorSettings::get_global(cx);
5343                        match settings.scroll_beyond_last_line {
5344                            ScrollBeyondLastLine::OnePage => max_row,
5345                            ScrollBeyondLastLine::Off => (max_row - height_in_lines + 1.).max(0.),
5346                            ScrollBeyondLastLine::VerticalScrollMargin => {
5347                                (max_row - height_in_lines + 1. + settings.vertical_scroll_margin)
5348                                    .max(0.)
5349                            }
5350                        }
5351                    };
5352
5353                    let mut autoscroll_request = None;
5354                    let mut autoscroll_containing_element = false;
5355                    let mut autoscroll_horizontally = false;
5356                    self.editor.update(cx, |editor, cx| {
5357                        autoscroll_request = editor.autoscroll_request();
5358                        autoscroll_containing_element =
5359                            autoscroll_request.is_some() || editor.has_pending_selection();
5360                        autoscroll_horizontally =
5361                            editor.autoscroll_vertically(bounds, line_height, max_scroll_top, cx);
5362                        snapshot = editor.snapshot(cx);
5363                    });
5364
5365                    let mut scroll_position = snapshot.scroll_position();
5366                    // The scroll position is a fractional point, the whole number of which represents
5367                    // the top of the window in terms of display rows.
5368                    let start_row = DisplayRow(scroll_position.y as u32);
5369                    let max_row = snapshot.max_point().row();
5370                    let end_row = cmp::min(
5371                        (scroll_position.y + height_in_lines).ceil() as u32,
5372                        max_row.next_row().0,
5373                    );
5374                    let end_row = DisplayRow(end_row);
5375
5376                    let buffer_rows = snapshot
5377                        .buffer_rows(start_row)
5378                        .take((start_row..end_row).len())
5379                        .collect::<Vec<_>>();
5380                    let is_row_soft_wrapped =
5381                        |row| buffer_rows.get(row).copied().flatten().is_none();
5382
5383                    let start_anchor = if start_row == Default::default() {
5384                        Anchor::min()
5385                    } else {
5386                        snapshot.buffer_snapshot.anchor_before(
5387                            DisplayPoint::new(start_row, 0).to_offset(&snapshot, Bias::Left),
5388                        )
5389                    };
5390                    let end_anchor = if end_row > max_row {
5391                        Anchor::max()
5392                    } else {
5393                        snapshot.buffer_snapshot.anchor_before(
5394                            DisplayPoint::new(end_row, 0).to_offset(&snapshot, Bias::Right),
5395                        )
5396                    };
5397
5398                    let highlighted_rows = self
5399                        .editor
5400                        .update(cx, |editor, cx| editor.highlighted_display_rows(cx));
5401                    let highlighted_ranges = self.editor.read(cx).background_highlights_in_range(
5402                        start_anchor..end_anchor,
5403                        &snapshot.display_snapshot,
5404                        cx.theme().colors(),
5405                    );
5406                    let highlighted_gutter_ranges =
5407                        self.editor.read(cx).gutter_highlights_in_range(
5408                            start_anchor..end_anchor,
5409                            &snapshot.display_snapshot,
5410                            cx,
5411                        );
5412
5413                    let redacted_ranges = self.editor.read(cx).redacted_ranges(
5414                        start_anchor..end_anchor,
5415                        &snapshot.display_snapshot,
5416                        cx,
5417                    );
5418
5419                    let local_selections: Vec<Selection<Point>> =
5420                        self.editor.update(cx, |editor, cx| {
5421                            let mut selections = editor
5422                                .selections
5423                                .disjoint_in_range(start_anchor..end_anchor, cx);
5424                            selections.extend(editor.selections.pending(cx));
5425                            selections
5426                        });
5427
5428                    let (selections, active_rows, newest_selection_head) = self.layout_selections(
5429                        start_anchor,
5430                        end_anchor,
5431                        &local_selections,
5432                        &snapshot,
5433                        start_row,
5434                        end_row,
5435                        cx,
5436                    );
5437
5438                    let line_numbers = self.layout_line_numbers(
5439                        start_row..end_row,
5440                        buffer_rows.iter().copied(),
5441                        &active_rows,
5442                        newest_selection_head,
5443                        &snapshot,
5444                        cx,
5445                    );
5446
5447                    let mut crease_toggles = cx.with_element_namespace("crease_toggles", |cx| {
5448                        self.layout_crease_toggles(
5449                            start_row..end_row,
5450                            buffer_rows.iter().copied(),
5451                            &active_rows,
5452                            &snapshot,
5453                            cx,
5454                        )
5455                    });
5456                    let crease_trailers = cx.with_element_namespace("crease_trailers", |cx| {
5457                        self.layout_crease_trailers(buffer_rows.iter().copied(), &snapshot, cx)
5458                    });
5459
5460                    let display_hunks = self.layout_gutter_git_hunks(
5461                        line_height,
5462                        &gutter_hitbox,
5463                        start_row..end_row,
5464                        start_anchor..end_anchor,
5465                        &snapshot,
5466                        cx,
5467                    );
5468
5469                    let mut max_visible_line_width = Pixels::ZERO;
5470                    let mut line_layouts = Self::layout_lines(
5471                        start_row..end_row,
5472                        &snapshot,
5473                        &self.style,
5474                        editor_width,
5475                        is_row_soft_wrapped,
5476                        cx,
5477                    );
5478                    for line_with_invisibles in &line_layouts {
5479                        if line_with_invisibles.width > max_visible_line_width {
5480                            max_visible_line_width = line_with_invisibles.width;
5481                        }
5482                    }
5483
5484                    let longest_line_width = layout_line(
5485                        snapshot.longest_row(),
5486                        &snapshot,
5487                        &style,
5488                        editor_width,
5489                        is_row_soft_wrapped,
5490                        cx,
5491                    )
5492                    .width;
5493                    let mut scroll_width =
5494                        longest_line_width.max(max_visible_line_width) + overscroll.width;
5495
5496                    let blocks = cx.with_element_namespace("blocks", |cx| {
5497                        self.render_blocks(
5498                            start_row..end_row,
5499                            &snapshot,
5500                            &hitbox,
5501                            &text_hitbox,
5502                            editor_width,
5503                            &mut scroll_width,
5504                            &gutter_dimensions,
5505                            em_width,
5506                            gutter_dimensions.full_width(),
5507                            line_height,
5508                            &line_layouts,
5509                            &local_selections,
5510                            is_row_soft_wrapped,
5511                            cx,
5512                        )
5513                    });
5514                    let mut blocks = match blocks {
5515                        Ok(blocks) => blocks,
5516                        Err(resized_blocks) => {
5517                            self.editor.update(cx, |editor, cx| {
5518                                editor.resize_blocks(resized_blocks, autoscroll_request, cx)
5519                            });
5520                            return self.prepaint(None, bounds, &mut (), cx);
5521                        }
5522                    };
5523
5524                    let start_buffer_row =
5525                        MultiBufferRow(start_anchor.to_point(&snapshot.buffer_snapshot).row);
5526                    let end_buffer_row =
5527                        MultiBufferRow(end_anchor.to_point(&snapshot.buffer_snapshot).row);
5528
5529                    let scroll_max = point(
5530                        ((scroll_width - text_hitbox.size.width) / em_width).max(0.0),
5531                        max_row.as_f32(),
5532                    );
5533
5534                    self.editor.update(cx, |editor, cx| {
5535                        let clamped = editor.scroll_manager.clamp_scroll_left(scroll_max.x);
5536
5537                        let autoscrolled = if autoscroll_horizontally {
5538                            editor.autoscroll_horizontally(
5539                                start_row,
5540                                text_hitbox.size.width,
5541                                scroll_width,
5542                                em_width,
5543                                &line_layouts,
5544                                cx,
5545                            )
5546                        } else {
5547                            false
5548                        };
5549
5550                        if clamped || autoscrolled {
5551                            snapshot = editor.snapshot(cx);
5552                            scroll_position = snapshot.scroll_position();
5553                        }
5554                    });
5555
5556                    let scroll_pixel_position = point(
5557                        scroll_position.x * em_width,
5558                        scroll_position.y * line_height,
5559                    );
5560
5561                    let indent_guides = self.layout_indent_guides(
5562                        content_origin,
5563                        text_hitbox.origin,
5564                        start_buffer_row..end_buffer_row,
5565                        scroll_pixel_position,
5566                        line_height,
5567                        &snapshot,
5568                        cx,
5569                    );
5570
5571                    let crease_trailers = cx.with_element_namespace("crease_trailers", |cx| {
5572                        self.prepaint_crease_trailers(
5573                            crease_trailers,
5574                            &line_layouts,
5575                            line_height,
5576                            content_origin,
5577                            scroll_pixel_position,
5578                            em_width,
5579                            cx,
5580                        )
5581                    });
5582
5583                    let mut inline_blame = None;
5584                    if let Some(newest_selection_head) = newest_selection_head {
5585                        let display_row = newest_selection_head.row();
5586                        if (start_row..end_row).contains(&display_row) {
5587                            let line_ix = display_row.minus(start_row) as usize;
5588                            let line_layout = &line_layouts[line_ix];
5589                            let crease_trailer_layout = crease_trailers[line_ix].as_ref();
5590                            inline_blame = self.layout_inline_blame(
5591                                display_row,
5592                                &snapshot.display_snapshot,
5593                                line_layout,
5594                                crease_trailer_layout,
5595                                em_width,
5596                                content_origin,
5597                                scroll_pixel_position,
5598                                line_height,
5599                                cx,
5600                            );
5601                        }
5602                    }
5603
5604                    let blamed_display_rows = self.layout_blame_entries(
5605                        buffer_rows.into_iter(),
5606                        em_width,
5607                        scroll_position,
5608                        line_height,
5609                        &gutter_hitbox,
5610                        gutter_dimensions.git_blame_entries_width,
5611                        cx,
5612                    );
5613
5614                    let scroll_max = point(
5615                        ((scroll_width - text_hitbox.size.width) / em_width).max(0.0),
5616                        max_scroll_top,
5617                    );
5618
5619                    self.editor.update(cx, |editor, cx| {
5620                        let clamped = editor.scroll_manager.clamp_scroll_left(scroll_max.x);
5621
5622                        let autoscrolled = if autoscroll_horizontally {
5623                            editor.autoscroll_horizontally(
5624                                start_row,
5625                                text_hitbox.size.width,
5626                                scroll_width,
5627                                em_width,
5628                                &line_layouts,
5629                                cx,
5630                            )
5631                        } else {
5632                            false
5633                        };
5634
5635                        if clamped || autoscrolled {
5636                            snapshot = editor.snapshot(cx);
5637                            scroll_position = snapshot.scroll_position();
5638                        }
5639                    });
5640
5641                    let line_elements = self.prepaint_lines(
5642                        start_row,
5643                        &mut line_layouts,
5644                        line_height,
5645                        scroll_pixel_position,
5646                        content_origin,
5647                        cx,
5648                    );
5649
5650                    let mut block_start_rows = HashSet::default();
5651                    cx.with_element_namespace("blocks", |cx| {
5652                        self.layout_blocks(
5653                            &mut blocks,
5654                            &mut block_start_rows,
5655                            &hitbox,
5656                            line_height,
5657                            scroll_pixel_position,
5658                            cx,
5659                        );
5660                    });
5661
5662                    let cursors = self.collect_cursors(&snapshot, cx);
5663                    let visible_row_range = start_row..end_row;
5664                    let non_visible_cursors = cursors
5665                        .iter()
5666                        .any(move |c| !visible_row_range.contains(&c.0.row()));
5667
5668                    let visible_cursors = self.layout_visible_cursors(
5669                        &snapshot,
5670                        &selections,
5671                        &block_start_rows,
5672                        start_row..end_row,
5673                        &line_layouts,
5674                        &text_hitbox,
5675                        content_origin,
5676                        scroll_position,
5677                        scroll_pixel_position,
5678                        line_height,
5679                        em_width,
5680                        autoscroll_containing_element,
5681                        cx,
5682                    );
5683
5684                    let scrollbar_layout = self.layout_scrollbar(
5685                        &snapshot,
5686                        bounds,
5687                        scroll_position,
5688                        height_in_lines,
5689                        non_visible_cursors,
5690                        cx,
5691                    );
5692
5693                    let gutter_settings = EditorSettings::get_global(cx).gutter;
5694
5695                    let expanded_add_hunks_by_rows = self.editor.update(cx, |editor, _| {
5696                        editor
5697                            .diff_map
5698                            .hunks(false)
5699                            .filter(|hunk| hunk.status == DiffHunkStatus::Added)
5700                            .map(|expanded_hunk| {
5701                                let start_row = expanded_hunk
5702                                    .hunk_range
5703                                    .start
5704                                    .to_display_point(&snapshot)
5705                                    .row();
5706                                (start_row, expanded_hunk.clone())
5707                            })
5708                            .collect::<HashMap<_, _>>()
5709                    });
5710
5711                    let rows_with_hunk_bounds = display_hunks
5712                        .iter()
5713                        .filter_map(|(hunk, hitbox)| Some((hunk, hitbox.as_ref()?.bounds)))
5714                        .fold(
5715                            HashMap::default(),
5716                            |mut rows_with_hunk_bounds, (hunk, bounds)| {
5717                                match hunk {
5718                                    DisplayDiffHunk::Folded { display_row } => {
5719                                        rows_with_hunk_bounds.insert(*display_row, bounds);
5720                                    }
5721                                    DisplayDiffHunk::Unfolded {
5722                                        display_row_range, ..
5723                                    } => {
5724                                        for display_row in display_row_range.iter_rows() {
5725                                            rows_with_hunk_bounds.insert(display_row, bounds);
5726                                        }
5727                                    }
5728                                }
5729                                rows_with_hunk_bounds
5730                            },
5731                        );
5732                    let mut _context_menu_visible = false;
5733                    let mut code_actions_indicator = None;
5734                    if let Some(newest_selection_head) = newest_selection_head {
5735                        if (start_row..end_row).contains(&newest_selection_head.row()) {
5736                            _context_menu_visible = self.layout_context_menu(
5737                                line_height,
5738                                &hitbox,
5739                                &text_hitbox,
5740                                content_origin,
5741                                start_row,
5742                                scroll_pixel_position,
5743                                &line_layouts,
5744                                newest_selection_head,
5745                                gutter_dimensions.width - gutter_dimensions.left_padding,
5746                                cx,
5747                            );
5748
5749                            let show_code_actions = snapshot
5750                                .show_code_actions
5751                                .unwrap_or(gutter_settings.code_actions);
5752                            if show_code_actions {
5753                                let newest_selection_point =
5754                                    newest_selection_head.to_point(&snapshot.display_snapshot);
5755                                let newest_selection_display_row =
5756                                    newest_selection_point.to_display_point(&snapshot).row();
5757                                if !expanded_add_hunks_by_rows
5758                                    .contains_key(&newest_selection_display_row)
5759                                {
5760                                    let buffer = snapshot.buffer_snapshot.buffer_line_for_row(
5761                                        MultiBufferRow(newest_selection_point.row),
5762                                    );
5763                                    if let Some((buffer, range)) = buffer {
5764                                        let buffer_id = buffer.remote_id();
5765                                        let row = range.start.row;
5766                                        let has_test_indicator = self
5767                                            .editor
5768                                            .read(cx)
5769                                            .tasks
5770                                            .contains_key(&(buffer_id, row));
5771
5772                                        if !has_test_indicator {
5773                                            code_actions_indicator = self
5774                                                .layout_code_actions_indicator(
5775                                                    line_height,
5776                                                    newest_selection_head,
5777                                                    scroll_pixel_position,
5778                                                    &gutter_dimensions,
5779                                                    &gutter_hitbox,
5780                                                    &rows_with_hunk_bounds,
5781                                                    cx,
5782                                                );
5783                                        }
5784                                    }
5785                                }
5786                            }
5787                        }
5788                    }
5789
5790                    let test_indicators = if gutter_settings.runnables {
5791                        self.layout_run_indicators(
5792                            line_height,
5793                            start_row..end_row,
5794                            scroll_pixel_position,
5795                            &gutter_dimensions,
5796                            &gutter_hitbox,
5797                            &rows_with_hunk_bounds,
5798                            &snapshot,
5799                            cx,
5800                        )
5801                    } else {
5802                        Vec::new()
5803                    };
5804
5805                    self.layout_signature_help(
5806                        &hitbox,
5807                        content_origin,
5808                        scroll_pixel_position,
5809                        newest_selection_head,
5810                        start_row,
5811                        &line_layouts,
5812                        line_height,
5813                        em_width,
5814                        cx,
5815                    );
5816
5817                    if !cx.has_active_drag() {
5818                        self.layout_hover_popovers(
5819                            &snapshot,
5820                            &hitbox,
5821                            &text_hitbox,
5822                            start_row..end_row,
5823                            content_origin,
5824                            scroll_pixel_position,
5825                            &line_layouts,
5826                            line_height,
5827                            em_width,
5828                            cx,
5829                        );
5830                    }
5831
5832                    let inline_completion_popover = self.layout_inline_completion_popover(
5833                        &text_hitbox.bounds,
5834                        &snapshot,
5835                        start_row..end_row,
5836                        scroll_position.y,
5837                        scroll_position.y + height_in_lines,
5838                        &line_layouts,
5839                        line_height,
5840                        scroll_pixel_position,
5841                        editor_width,
5842                        &style,
5843                        cx,
5844                    );
5845
5846                    let mouse_context_menu = self.layout_mouse_context_menu(
5847                        &snapshot,
5848                        start_row..end_row,
5849                        content_origin,
5850                        cx,
5851                    );
5852
5853                    cx.with_element_namespace("crease_toggles", |cx| {
5854                        self.prepaint_crease_toggles(
5855                            &mut crease_toggles,
5856                            line_height,
5857                            &gutter_dimensions,
5858                            gutter_settings,
5859                            scroll_pixel_position,
5860                            &gutter_hitbox,
5861                            cx,
5862                        )
5863                    });
5864
5865                    let invisible_symbol_font_size = font_size / 2.;
5866                    let tab_invisible = cx
5867                        .text_system()
5868                        .shape_line(
5869                            "→".into(),
5870                            invisible_symbol_font_size,
5871                            &[TextRun {
5872                                len: "→".len(),
5873                                font: self.style.text.font(),
5874                                color: cx.theme().colors().editor_invisible,
5875                                background_color: None,
5876                                underline: None,
5877                                strikethrough: None,
5878                            }],
5879                        )
5880                        .unwrap();
5881                    let space_invisible = cx
5882                        .text_system()
5883                        .shape_line(
5884                            "•".into(),
5885                            invisible_symbol_font_size,
5886                            &[TextRun {
5887                                len: "•".len(),
5888                                font: self.style.text.font(),
5889                                color: cx.theme().colors().editor_invisible,
5890                                background_color: None,
5891                                underline: None,
5892                                strikethrough: None,
5893                            }],
5894                        )
5895                        .unwrap();
5896
5897                    EditorLayout {
5898                        mode: snapshot.mode,
5899                        position_map: Rc::new(PositionMap {
5900                            size: bounds.size,
5901                            scroll_pixel_position,
5902                            scroll_max,
5903                            line_layouts,
5904                            line_height,
5905                            em_width,
5906                            em_advance,
5907                            snapshot,
5908                        }),
5909                        visible_display_row_range: start_row..end_row,
5910                        wrap_guides,
5911                        indent_guides,
5912                        hitbox,
5913                        text_hitbox,
5914                        gutter_hitbox,
5915                        gutter_dimensions,
5916                        display_hunks,
5917                        content_origin,
5918                        scrollbar_layout,
5919                        active_rows,
5920                        highlighted_rows,
5921                        highlighted_ranges,
5922                        highlighted_gutter_ranges,
5923                        redacted_ranges,
5924                        line_elements,
5925                        line_numbers,
5926                        blamed_display_rows,
5927                        inline_blame,
5928                        blocks,
5929                        cursors,
5930                        visible_cursors,
5931                        selections,
5932                        inline_completion_popover,
5933                        mouse_context_menu,
5934                        test_indicators,
5935                        code_actions_indicator,
5936                        crease_toggles,
5937                        crease_trailers,
5938                        tab_invisible,
5939                        space_invisible,
5940                    }
5941                })
5942            })
5943        })
5944    }
5945
5946    fn paint(
5947        &mut self,
5948        _: Option<&GlobalElementId>,
5949        bounds: Bounds<gpui::Pixels>,
5950        _: &mut Self::RequestLayoutState,
5951        layout: &mut Self::PrepaintState,
5952        cx: &mut WindowContext,
5953    ) {
5954        let focus_handle = self.editor.focus_handle(cx);
5955        let key_context = self.editor.update(cx, |editor, cx| editor.key_context(cx));
5956        cx.set_key_context(key_context);
5957        cx.handle_input(
5958            &focus_handle,
5959            ElementInputHandler::new(bounds, self.editor.clone()),
5960        );
5961        self.register_actions(cx);
5962        self.register_key_listeners(cx, layout);
5963
5964        let text_style = TextStyleRefinement {
5965            font_size: Some(self.style.text.font_size),
5966            line_height: Some(self.style.text.line_height),
5967            ..Default::default()
5968        };
5969        let hovered_hunk = layout
5970            .display_hunks
5971            .iter()
5972            .find_map(|(hunk, hunk_hitbox)| match hunk {
5973                DisplayDiffHunk::Folded { .. } => None,
5974                DisplayDiffHunk::Unfolded {
5975                    diff_base_byte_range,
5976                    multi_buffer_range,
5977                    status,
5978                    ..
5979                } => {
5980                    if hunk_hitbox
5981                        .as_ref()
5982                        .map(|hitbox| hitbox.is_hovered(cx))
5983                        .unwrap_or(false)
5984                    {
5985                        Some(HoveredHunk {
5986                            status: *status,
5987                            multi_buffer_range: multi_buffer_range.clone(),
5988                            diff_base_byte_range: diff_base_byte_range.clone(),
5989                        })
5990                    } else {
5991                        None
5992                    }
5993                }
5994            });
5995        let rem_size = self.rem_size(cx);
5996        cx.with_rem_size(rem_size, |cx| {
5997            cx.with_text_style(Some(text_style), |cx| {
5998                cx.with_content_mask(Some(ContentMask { bounds }), |cx| {
5999                    self.paint_mouse_listeners(layout, hovered_hunk, cx);
6000                    self.paint_background(layout, cx);
6001                    self.paint_indent_guides(layout, cx);
6002
6003                    if layout.gutter_hitbox.size.width > Pixels::ZERO {
6004                        self.paint_blamed_display_rows(layout, cx);
6005                        self.paint_line_numbers(layout, cx);
6006                    }
6007
6008                    self.paint_text(layout, cx);
6009
6010                    if layout.gutter_hitbox.size.width > Pixels::ZERO {
6011                        self.paint_gutter_highlights(layout, cx);
6012                        self.paint_gutter_indicators(layout, cx);
6013                    }
6014
6015                    if !layout.blocks.is_empty() {
6016                        cx.with_element_namespace("blocks", |cx| {
6017                            self.paint_blocks(layout, cx);
6018                        });
6019                    }
6020
6021                    self.paint_scrollbar(layout, cx);
6022                    self.paint_inline_completion_popover(layout, cx);
6023                    self.paint_mouse_context_menu(layout, cx);
6024                });
6025            })
6026        })
6027    }
6028}
6029
6030pub(super) fn gutter_bounds(
6031    editor_bounds: Bounds<Pixels>,
6032    gutter_dimensions: GutterDimensions,
6033) -> Bounds<Pixels> {
6034    Bounds {
6035        origin: editor_bounds.origin,
6036        size: size(gutter_dimensions.width, editor_bounds.size.height),
6037    }
6038}
6039
6040impl IntoElement for EditorElement {
6041    type Element = Self;
6042
6043    fn into_element(self) -> Self::Element {
6044        self
6045    }
6046}
6047
6048pub struct EditorLayout {
6049    position_map: Rc<PositionMap>,
6050    hitbox: Hitbox,
6051    text_hitbox: Hitbox,
6052    gutter_hitbox: Hitbox,
6053    gutter_dimensions: GutterDimensions,
6054    content_origin: gpui::Point<Pixels>,
6055    scrollbar_layout: Option<ScrollbarLayout>,
6056    mode: EditorMode,
6057    wrap_guides: SmallVec<[(Pixels, bool); 2]>,
6058    indent_guides: Option<Vec<IndentGuideLayout>>,
6059    visible_display_row_range: Range<DisplayRow>,
6060    active_rows: BTreeMap<DisplayRow, bool>,
6061    highlighted_rows: BTreeMap<DisplayRow, Hsla>,
6062    line_elements: SmallVec<[AnyElement; 1]>,
6063    line_numbers: Vec<Option<ShapedLine>>,
6064    display_hunks: Vec<(DisplayDiffHunk, Option<Hitbox>)>,
6065    blamed_display_rows: Option<Vec<AnyElement>>,
6066    inline_blame: Option<AnyElement>,
6067    blocks: Vec<BlockLayout>,
6068    highlighted_ranges: Vec<(Range<DisplayPoint>, Hsla)>,
6069    highlighted_gutter_ranges: Vec<(Range<DisplayPoint>, Hsla)>,
6070    redacted_ranges: Vec<Range<DisplayPoint>>,
6071    cursors: Vec<(DisplayPoint, Hsla)>,
6072    visible_cursors: Vec<CursorLayout>,
6073    selections: Vec<(PlayerColor, Vec<SelectionLayout>)>,
6074    code_actions_indicator: Option<AnyElement>,
6075    test_indicators: Vec<AnyElement>,
6076    crease_toggles: Vec<Option<AnyElement>>,
6077    crease_trailers: Vec<Option<CreaseTrailerLayout>>,
6078    inline_completion_popover: Option<AnyElement>,
6079    mouse_context_menu: Option<AnyElement>,
6080    tab_invisible: ShapedLine,
6081    space_invisible: ShapedLine,
6082}
6083
6084impl EditorLayout {
6085    fn line_end_overshoot(&self) -> Pixels {
6086        0.15 * self.position_map.line_height
6087    }
6088}
6089
6090struct ColoredRange<T> {
6091    start: T,
6092    end: T,
6093    color: Hsla,
6094}
6095
6096#[derive(Clone)]
6097struct ScrollbarLayout {
6098    hitbox: Hitbox,
6099    visible_row_range: Range<f32>,
6100    visible: bool,
6101    row_height: Pixels,
6102    thumb_height: Pixels,
6103}
6104
6105impl ScrollbarLayout {
6106    const BORDER_WIDTH: Pixels = px(1.0);
6107    const LINE_MARKER_HEIGHT: Pixels = px(2.0);
6108    const MIN_MARKER_HEIGHT: Pixels = px(5.0);
6109    const MIN_THUMB_HEIGHT: Pixels = px(20.0);
6110
6111    fn thumb_bounds(&self) -> Bounds<Pixels> {
6112        let thumb_top = self.y_for_row(self.visible_row_range.start);
6113        let thumb_bottom = thumb_top + self.thumb_height;
6114        Bounds::from_corners(
6115            point(self.hitbox.left(), thumb_top),
6116            point(self.hitbox.right(), thumb_bottom),
6117        )
6118    }
6119
6120    fn y_for_row(&self, row: f32) -> Pixels {
6121        self.hitbox.top() + row * self.row_height
6122    }
6123
6124    fn marker_quads_for_ranges(
6125        &self,
6126        row_ranges: impl IntoIterator<Item = ColoredRange<DisplayRow>>,
6127        column: Option<usize>,
6128    ) -> Vec<PaintQuad> {
6129        struct MinMax {
6130            min: Pixels,
6131            max: Pixels,
6132        }
6133        let (x_range, height_limit) = if let Some(column) = column {
6134            let column_width = px(((self.hitbox.size.width - Self::BORDER_WIDTH).0 / 3.0).floor());
6135            let start = Self::BORDER_WIDTH + (column as f32 * column_width);
6136            let end = start + column_width;
6137            (
6138                Range { start, end },
6139                MinMax {
6140                    min: Self::MIN_MARKER_HEIGHT,
6141                    max: px(f32::MAX),
6142                },
6143            )
6144        } else {
6145            (
6146                Range {
6147                    start: Self::BORDER_WIDTH,
6148                    end: self.hitbox.size.width,
6149                },
6150                MinMax {
6151                    min: Self::LINE_MARKER_HEIGHT,
6152                    max: Self::LINE_MARKER_HEIGHT,
6153                },
6154            )
6155        };
6156
6157        let row_to_y = |row: DisplayRow| row.as_f32() * self.row_height;
6158        let mut pixel_ranges = row_ranges
6159            .into_iter()
6160            .map(|range| {
6161                let start_y = row_to_y(range.start);
6162                let end_y = row_to_y(range.end)
6163                    + self.row_height.max(height_limit.min).min(height_limit.max);
6164                ColoredRange {
6165                    start: start_y,
6166                    end: end_y,
6167                    color: range.color,
6168                }
6169            })
6170            .peekable();
6171
6172        let mut quads = Vec::new();
6173        while let Some(mut pixel_range) = pixel_ranges.next() {
6174            while let Some(next_pixel_range) = pixel_ranges.peek() {
6175                if pixel_range.end >= next_pixel_range.start - px(1.0)
6176                    && pixel_range.color == next_pixel_range.color
6177                {
6178                    pixel_range.end = next_pixel_range.end.max(pixel_range.end);
6179                    pixel_ranges.next();
6180                } else {
6181                    break;
6182                }
6183            }
6184
6185            let bounds = Bounds::from_corners(
6186                point(x_range.start, pixel_range.start),
6187                point(x_range.end, pixel_range.end),
6188            );
6189            quads.push(quad(
6190                bounds,
6191                Corners::default(),
6192                pixel_range.color,
6193                Edges::default(),
6194                Hsla::transparent_black(),
6195            ));
6196        }
6197
6198        quads
6199    }
6200}
6201
6202struct CreaseTrailerLayout {
6203    element: AnyElement,
6204    bounds: Bounds<Pixels>,
6205}
6206
6207struct PositionMap {
6208    size: Size<Pixels>,
6209    line_height: Pixels,
6210    scroll_pixel_position: gpui::Point<Pixels>,
6211    scroll_max: gpui::Point<f32>,
6212    em_width: Pixels,
6213    em_advance: Pixels,
6214    line_layouts: Vec<LineWithInvisibles>,
6215    snapshot: EditorSnapshot,
6216}
6217
6218#[derive(Debug, Copy, Clone)]
6219pub struct PointForPosition {
6220    pub previous_valid: DisplayPoint,
6221    pub next_valid: DisplayPoint,
6222    pub exact_unclipped: DisplayPoint,
6223    pub column_overshoot_after_line_end: u32,
6224}
6225
6226impl PointForPosition {
6227    pub fn as_valid(&self) -> Option<DisplayPoint> {
6228        if self.previous_valid == self.exact_unclipped && self.next_valid == self.exact_unclipped {
6229            Some(self.previous_valid)
6230        } else {
6231            None
6232        }
6233    }
6234}
6235
6236impl PositionMap {
6237    fn point_for_position(
6238        &self,
6239        text_bounds: Bounds<Pixels>,
6240        position: gpui::Point<Pixels>,
6241    ) -> PointForPosition {
6242        let scroll_position = self.snapshot.scroll_position();
6243        let position = position - text_bounds.origin;
6244        let y = position.y.max(px(0.)).min(self.size.height);
6245        let x = position.x + (scroll_position.x * self.em_width);
6246        let row = ((y / self.line_height) + scroll_position.y) as u32;
6247
6248        let (column, x_overshoot_after_line_end) = if let Some(line) = self
6249            .line_layouts
6250            .get(row as usize - scroll_position.y as usize)
6251        {
6252            if let Some(ix) = line.index_for_x(x) {
6253                (ix as u32, px(0.))
6254            } else {
6255                (line.len as u32, px(0.).max(x - line.width))
6256            }
6257        } else {
6258            (0, x)
6259        };
6260
6261        let mut exact_unclipped = DisplayPoint::new(DisplayRow(row), column);
6262        let previous_valid = self.snapshot.clip_point(exact_unclipped, Bias::Left);
6263        let next_valid = self.snapshot.clip_point(exact_unclipped, Bias::Right);
6264
6265        let column_overshoot_after_line_end = (x_overshoot_after_line_end / self.em_advance) as u32;
6266        *exact_unclipped.column_mut() += column_overshoot_after_line_end;
6267        PointForPosition {
6268            previous_valid,
6269            next_valid,
6270            exact_unclipped,
6271            column_overshoot_after_line_end,
6272        }
6273    }
6274}
6275
6276struct BlockLayout {
6277    id: BlockId,
6278    row: Option<DisplayRow>,
6279    element: AnyElement,
6280    available_space: Size<AvailableSpace>,
6281    style: BlockStyle,
6282}
6283
6284fn layout_line(
6285    row: DisplayRow,
6286    snapshot: &EditorSnapshot,
6287    style: &EditorStyle,
6288    text_width: Pixels,
6289    is_row_soft_wrapped: impl Copy + Fn(usize) -> bool,
6290    cx: &mut WindowContext,
6291) -> LineWithInvisibles {
6292    let chunks = snapshot.highlighted_chunks(row..row + DisplayRow(1), true, style);
6293    LineWithInvisibles::from_chunks(
6294        chunks,
6295        &style,
6296        MAX_LINE_LEN,
6297        1,
6298        snapshot.mode,
6299        text_width,
6300        is_row_soft_wrapped,
6301        cx,
6302    )
6303    .pop()
6304    .unwrap()
6305}
6306
6307#[derive(Debug)]
6308pub struct IndentGuideLayout {
6309    origin: gpui::Point<Pixels>,
6310    length: Pixels,
6311    single_indent_width: Pixels,
6312    depth: u32,
6313    active: bool,
6314    settings: IndentGuideSettings,
6315}
6316
6317pub struct CursorLayout {
6318    origin: gpui::Point<Pixels>,
6319    block_width: Pixels,
6320    line_height: Pixels,
6321    color: Hsla,
6322    shape: CursorShape,
6323    block_text: Option<ShapedLine>,
6324    cursor_name: Option<AnyElement>,
6325}
6326
6327#[derive(Debug)]
6328pub struct CursorName {
6329    string: SharedString,
6330    color: Hsla,
6331    is_top_row: bool,
6332}
6333
6334impl CursorLayout {
6335    pub fn new(
6336        origin: gpui::Point<Pixels>,
6337        block_width: Pixels,
6338        line_height: Pixels,
6339        color: Hsla,
6340        shape: CursorShape,
6341        block_text: Option<ShapedLine>,
6342    ) -> CursorLayout {
6343        CursorLayout {
6344            origin,
6345            block_width,
6346            line_height,
6347            color,
6348            shape,
6349            block_text,
6350            cursor_name: None,
6351        }
6352    }
6353
6354    pub fn bounding_rect(&self, origin: gpui::Point<Pixels>) -> Bounds<Pixels> {
6355        Bounds {
6356            origin: self.origin + origin,
6357            size: size(self.block_width, self.line_height),
6358        }
6359    }
6360
6361    fn bounds(&self, origin: gpui::Point<Pixels>) -> Bounds<Pixels> {
6362        match self.shape {
6363            CursorShape::Bar => Bounds {
6364                origin: self.origin + origin,
6365                size: size(px(2.0), self.line_height),
6366            },
6367            CursorShape::Block | CursorShape::Hollow => Bounds {
6368                origin: self.origin + origin,
6369                size: size(self.block_width, self.line_height),
6370            },
6371            CursorShape::Underline => Bounds {
6372                origin: self.origin
6373                    + origin
6374                    + gpui::Point::new(Pixels::ZERO, self.line_height - px(2.0)),
6375                size: size(self.block_width, px(2.0)),
6376            },
6377        }
6378    }
6379
6380    pub fn layout(
6381        &mut self,
6382        origin: gpui::Point<Pixels>,
6383        cursor_name: Option<CursorName>,
6384        cx: &mut WindowContext,
6385    ) {
6386        if let Some(cursor_name) = cursor_name {
6387            let bounds = self.bounds(origin);
6388            let text_size = self.line_height / 1.5;
6389
6390            let name_origin = if cursor_name.is_top_row {
6391                point(bounds.right() - px(1.), bounds.top())
6392            } else {
6393                point(bounds.left(), bounds.top() - text_size / 2. - px(1.))
6394            };
6395            let mut name_element = div()
6396                .bg(self.color)
6397                .text_size(text_size)
6398                .px_0p5()
6399                .line_height(text_size + px(2.))
6400                .text_color(cursor_name.color)
6401                .child(cursor_name.string.clone())
6402                .into_any_element();
6403
6404            name_element.prepaint_as_root(name_origin, AvailableSpace::min_size(), cx);
6405
6406            self.cursor_name = Some(name_element);
6407        }
6408    }
6409
6410    pub fn paint(&mut self, origin: gpui::Point<Pixels>, cx: &mut WindowContext) {
6411        let bounds = self.bounds(origin);
6412
6413        //Draw background or border quad
6414        let cursor = if matches!(self.shape, CursorShape::Hollow) {
6415            outline(bounds, self.color)
6416        } else {
6417            fill(bounds, self.color)
6418        };
6419
6420        if let Some(name) = &mut self.cursor_name {
6421            name.paint(cx);
6422        }
6423
6424        cx.paint_quad(cursor);
6425
6426        if let Some(block_text) = &self.block_text {
6427            block_text
6428                .paint(self.origin + origin, self.line_height, cx)
6429                .log_err();
6430        }
6431    }
6432
6433    pub fn shape(&self) -> CursorShape {
6434        self.shape
6435    }
6436}
6437
6438#[derive(Debug)]
6439pub struct HighlightedRange {
6440    pub start_y: Pixels,
6441    pub line_height: Pixels,
6442    pub lines: Vec<HighlightedRangeLine>,
6443    pub color: Hsla,
6444    pub corner_radius: Pixels,
6445}
6446
6447#[derive(Debug)]
6448pub struct HighlightedRangeLine {
6449    pub start_x: Pixels,
6450    pub end_x: Pixels,
6451}
6452
6453impl HighlightedRange {
6454    pub fn paint(&self, bounds: Bounds<Pixels>, cx: &mut WindowContext) {
6455        if self.lines.len() >= 2 && self.lines[0].start_x > self.lines[1].end_x {
6456            self.paint_lines(self.start_y, &self.lines[0..1], bounds, cx);
6457            self.paint_lines(
6458                self.start_y + self.line_height,
6459                &self.lines[1..],
6460                bounds,
6461                cx,
6462            );
6463        } else {
6464            self.paint_lines(self.start_y, &self.lines, bounds, cx);
6465        }
6466    }
6467
6468    fn paint_lines(
6469        &self,
6470        start_y: Pixels,
6471        lines: &[HighlightedRangeLine],
6472        _bounds: Bounds<Pixels>,
6473        cx: &mut WindowContext,
6474    ) {
6475        if lines.is_empty() {
6476            return;
6477        }
6478
6479        let first_line = lines.first().unwrap();
6480        let last_line = lines.last().unwrap();
6481
6482        let first_top_left = point(first_line.start_x, start_y);
6483        let first_top_right = point(first_line.end_x, start_y);
6484
6485        let curve_height = point(Pixels::ZERO, self.corner_radius);
6486        let curve_width = |start_x: Pixels, end_x: Pixels| {
6487            let max = (end_x - start_x) / 2.;
6488            let width = if max < self.corner_radius {
6489                max
6490            } else {
6491                self.corner_radius
6492            };
6493
6494            point(width, Pixels::ZERO)
6495        };
6496
6497        let top_curve_width = curve_width(first_line.start_x, first_line.end_x);
6498        let mut path = gpui::Path::new(first_top_right - top_curve_width);
6499        path.curve_to(first_top_right + curve_height, first_top_right);
6500
6501        let mut iter = lines.iter().enumerate().peekable();
6502        while let Some((ix, line)) = iter.next() {
6503            let bottom_right = point(line.end_x, start_y + (ix + 1) as f32 * self.line_height);
6504
6505            if let Some((_, next_line)) = iter.peek() {
6506                let next_top_right = point(next_line.end_x, bottom_right.y);
6507
6508                match next_top_right.x.partial_cmp(&bottom_right.x).unwrap() {
6509                    Ordering::Equal => {
6510                        path.line_to(bottom_right);
6511                    }
6512                    Ordering::Less => {
6513                        let curve_width = curve_width(next_top_right.x, bottom_right.x);
6514                        path.line_to(bottom_right - curve_height);
6515                        if self.corner_radius > Pixels::ZERO {
6516                            path.curve_to(bottom_right - curve_width, bottom_right);
6517                        }
6518                        path.line_to(next_top_right + curve_width);
6519                        if self.corner_radius > Pixels::ZERO {
6520                            path.curve_to(next_top_right + curve_height, next_top_right);
6521                        }
6522                    }
6523                    Ordering::Greater => {
6524                        let curve_width = curve_width(bottom_right.x, next_top_right.x);
6525                        path.line_to(bottom_right - curve_height);
6526                        if self.corner_radius > Pixels::ZERO {
6527                            path.curve_to(bottom_right + curve_width, bottom_right);
6528                        }
6529                        path.line_to(next_top_right - curve_width);
6530                        if self.corner_radius > Pixels::ZERO {
6531                            path.curve_to(next_top_right + curve_height, next_top_right);
6532                        }
6533                    }
6534                }
6535            } else {
6536                let curve_width = curve_width(line.start_x, line.end_x);
6537                path.line_to(bottom_right - curve_height);
6538                if self.corner_radius > Pixels::ZERO {
6539                    path.curve_to(bottom_right - curve_width, bottom_right);
6540                }
6541
6542                let bottom_left = point(line.start_x, bottom_right.y);
6543                path.line_to(bottom_left + curve_width);
6544                if self.corner_radius > Pixels::ZERO {
6545                    path.curve_to(bottom_left - curve_height, bottom_left);
6546                }
6547            }
6548        }
6549
6550        if first_line.start_x > last_line.start_x {
6551            let curve_width = curve_width(last_line.start_x, first_line.start_x);
6552            let second_top_left = point(last_line.start_x, start_y + self.line_height);
6553            path.line_to(second_top_left + curve_height);
6554            if self.corner_radius > Pixels::ZERO {
6555                path.curve_to(second_top_left + curve_width, second_top_left);
6556            }
6557            let first_bottom_left = point(first_line.start_x, second_top_left.y);
6558            path.line_to(first_bottom_left - curve_width);
6559            if self.corner_radius > Pixels::ZERO {
6560                path.curve_to(first_bottom_left - curve_height, first_bottom_left);
6561            }
6562        }
6563
6564        path.line_to(first_top_left + curve_height);
6565        if self.corner_radius > Pixels::ZERO {
6566            path.curve_to(first_top_left + top_curve_width, first_top_left);
6567        }
6568        path.line_to(first_top_right - top_curve_width);
6569
6570        cx.paint_path(path, self.color);
6571    }
6572}
6573
6574pub fn scale_vertical_mouse_autoscroll_delta(delta: Pixels) -> f32 {
6575    (delta.pow(1.5) / 100.0).into()
6576}
6577
6578fn scale_horizontal_mouse_autoscroll_delta(delta: Pixels) -> f32 {
6579    (delta.pow(1.2) / 300.0).into()
6580}
6581
6582pub fn register_action<T: Action>(
6583    view: &View<Editor>,
6584    cx: &mut WindowContext,
6585    listener: impl Fn(&mut Editor, &T, &mut ViewContext<Editor>) + 'static,
6586) {
6587    let view = view.clone();
6588    cx.on_action(TypeId::of::<T>(), move |action, phase, cx| {
6589        let action = action.downcast_ref().unwrap();
6590        if phase == DispatchPhase::Bubble {
6591            view.update(cx, |editor, cx| {
6592                listener(editor, action, cx);
6593            })
6594        }
6595    })
6596}
6597
6598fn compute_auto_height_layout(
6599    editor: &mut Editor,
6600    max_lines: usize,
6601    max_line_number_width: Pixels,
6602    known_dimensions: Size<Option<Pixels>>,
6603    available_width: AvailableSpace,
6604    cx: &mut ViewContext<Editor>,
6605) -> Option<Size<Pixels>> {
6606    let width = known_dimensions.width.or({
6607        if let AvailableSpace::Definite(available_width) = available_width {
6608            Some(available_width)
6609        } else {
6610            None
6611        }
6612    })?;
6613    if let Some(height) = known_dimensions.height {
6614        return Some(size(width, height));
6615    }
6616
6617    let style = editor.style.as_ref().unwrap();
6618    let font_id = cx.text_system().resolve_font(&style.text.font());
6619    let font_size = style.text.font_size.to_pixels(cx.rem_size());
6620    let line_height = style.text.line_height_in_pixels(cx.rem_size());
6621    let em_width = cx
6622        .text_system()
6623        .typographic_bounds(font_id, font_size, 'm')
6624        .unwrap()
6625        .size
6626        .width;
6627    let em_advance = cx
6628        .text_system()
6629        .advance(font_id, font_size, 'm')
6630        .unwrap()
6631        .width;
6632
6633    let mut snapshot = editor.snapshot(cx);
6634    let gutter_dimensions = snapshot.gutter_dimensions(
6635        font_id,
6636        font_size,
6637        em_width,
6638        em_advance,
6639        max_line_number_width,
6640        cx,
6641    );
6642
6643    editor.gutter_dimensions = gutter_dimensions;
6644    let text_width = width - gutter_dimensions.width;
6645    let overscroll = size(em_width, px(0.));
6646
6647    let editor_width = text_width - gutter_dimensions.margin - overscroll.width - em_width;
6648    if editor.set_wrap_width(Some(editor_width), cx) {
6649        snapshot = editor.snapshot(cx);
6650    }
6651
6652    let scroll_height = Pixels::from(snapshot.max_point().row().next_row().0) * line_height;
6653    let height = scroll_height
6654        .max(line_height)
6655        .min(line_height * max_lines as f32);
6656
6657    Some(size(width, height))
6658}
6659
6660#[cfg(test)]
6661mod tests {
6662    use super::*;
6663    use crate::{
6664        display_map::{BlockPlacement, BlockProperties},
6665        editor_tests::{init_test, update_test_language_settings},
6666        Editor, MultiBuffer,
6667    };
6668    use gpui::{TestAppContext, VisualTestContext};
6669    use language::language_settings;
6670    use log::info;
6671    use std::num::NonZeroU32;
6672    use util::test::sample_text;
6673
6674    #[gpui::test]
6675    fn test_shape_line_numbers(cx: &mut TestAppContext) {
6676        init_test(cx, |_| {});
6677        let window = cx.add_window(|cx| {
6678            let buffer = MultiBuffer::build_simple(&sample_text(6, 6, 'a'), cx);
6679            Editor::new(EditorMode::Full, buffer, None, true, cx)
6680        });
6681
6682        let editor = window.root(cx).unwrap();
6683        let style = cx.update(|cx| editor.read(cx).style().unwrap().clone());
6684        let element = EditorElement::new(&editor, style);
6685        let snapshot = window.update(cx, |editor, cx| editor.snapshot(cx)).unwrap();
6686
6687        let layouts = cx
6688            .update_window(*window, |_, cx| {
6689                element.layout_line_numbers(
6690                    DisplayRow(0)..DisplayRow(6),
6691                    (0..6).map(MultiBufferRow).map(Some),
6692                    &Default::default(),
6693                    Some(DisplayPoint::new(DisplayRow(0), 0)),
6694                    &snapshot,
6695                    cx,
6696                )
6697            })
6698            .unwrap();
6699        assert_eq!(layouts.len(), 6);
6700
6701        let relative_rows = window
6702            .update(cx, |editor, cx| {
6703                let snapshot = editor.snapshot(cx);
6704                element.calculate_relative_line_numbers(
6705                    &snapshot,
6706                    &(DisplayRow(0)..DisplayRow(6)),
6707                    Some(DisplayRow(3)),
6708                )
6709            })
6710            .unwrap();
6711        assert_eq!(relative_rows[&DisplayRow(0)], 3);
6712        assert_eq!(relative_rows[&DisplayRow(1)], 2);
6713        assert_eq!(relative_rows[&DisplayRow(2)], 1);
6714        // current line has no relative number
6715        assert_eq!(relative_rows[&DisplayRow(4)], 1);
6716        assert_eq!(relative_rows[&DisplayRow(5)], 2);
6717
6718        // works if cursor is before screen
6719        let relative_rows = window
6720            .update(cx, |editor, cx| {
6721                let snapshot = editor.snapshot(cx);
6722                element.calculate_relative_line_numbers(
6723                    &snapshot,
6724                    &(DisplayRow(3)..DisplayRow(6)),
6725                    Some(DisplayRow(1)),
6726                )
6727            })
6728            .unwrap();
6729        assert_eq!(relative_rows.len(), 3);
6730        assert_eq!(relative_rows[&DisplayRow(3)], 2);
6731        assert_eq!(relative_rows[&DisplayRow(4)], 3);
6732        assert_eq!(relative_rows[&DisplayRow(5)], 4);
6733
6734        // works if cursor is after screen
6735        let relative_rows = window
6736            .update(cx, |editor, cx| {
6737                let snapshot = editor.snapshot(cx);
6738                element.calculate_relative_line_numbers(
6739                    &snapshot,
6740                    &(DisplayRow(0)..DisplayRow(3)),
6741                    Some(DisplayRow(6)),
6742                )
6743            })
6744            .unwrap();
6745        assert_eq!(relative_rows.len(), 3);
6746        assert_eq!(relative_rows[&DisplayRow(0)], 5);
6747        assert_eq!(relative_rows[&DisplayRow(1)], 4);
6748        assert_eq!(relative_rows[&DisplayRow(2)], 3);
6749    }
6750
6751    #[gpui::test]
6752    async fn test_vim_visual_selections(cx: &mut TestAppContext) {
6753        init_test(cx, |_| {});
6754
6755        let window = cx.add_window(|cx| {
6756            let buffer = MultiBuffer::build_simple(&(sample_text(6, 6, 'a') + "\n"), cx);
6757            Editor::new(EditorMode::Full, buffer, None, true, cx)
6758        });
6759        let cx = &mut VisualTestContext::from_window(*window, cx);
6760        let editor = window.root(cx).unwrap();
6761        let style = cx.update(|cx| editor.read(cx).style().unwrap().clone());
6762
6763        window
6764            .update(cx, |editor, cx| {
6765                editor.cursor_shape = CursorShape::Block;
6766                editor.change_selections(None, cx, |s| {
6767                    s.select_ranges([
6768                        Point::new(0, 0)..Point::new(1, 0),
6769                        Point::new(3, 2)..Point::new(3, 3),
6770                        Point::new(5, 6)..Point::new(6, 0),
6771                    ]);
6772                });
6773            })
6774            .unwrap();
6775
6776        let (_, state) = cx.draw(point(px(500.), px(500.)), size(px(500.), px(500.)), |_| {
6777            EditorElement::new(&editor, style)
6778        });
6779
6780        assert_eq!(state.selections.len(), 1);
6781        let local_selections = &state.selections[0].1;
6782        assert_eq!(local_selections.len(), 3);
6783        // moves cursor back one line
6784        assert_eq!(
6785            local_selections[0].head,
6786            DisplayPoint::new(DisplayRow(0), 6)
6787        );
6788        assert_eq!(
6789            local_selections[0].range,
6790            DisplayPoint::new(DisplayRow(0), 0)..DisplayPoint::new(DisplayRow(1), 0)
6791        );
6792
6793        // moves cursor back one column
6794        assert_eq!(
6795            local_selections[1].range,
6796            DisplayPoint::new(DisplayRow(3), 2)..DisplayPoint::new(DisplayRow(3), 3)
6797        );
6798        assert_eq!(
6799            local_selections[1].head,
6800            DisplayPoint::new(DisplayRow(3), 2)
6801        );
6802
6803        // leaves cursor on the max point
6804        assert_eq!(
6805            local_selections[2].range,
6806            DisplayPoint::new(DisplayRow(5), 6)..DisplayPoint::new(DisplayRow(6), 0)
6807        );
6808        assert_eq!(
6809            local_selections[2].head,
6810            DisplayPoint::new(DisplayRow(6), 0)
6811        );
6812
6813        // active lines does not include 1 (even though the range of the selection does)
6814        assert_eq!(
6815            state.active_rows.keys().cloned().collect::<Vec<_>>(),
6816            vec![DisplayRow(0), DisplayRow(3), DisplayRow(5), DisplayRow(6)]
6817        );
6818
6819        // multi-buffer support
6820        // in DisplayPoint coordinates, this is what we're dealing with:
6821        //  0: [[file
6822        //  1:   header
6823        //  2:   section]]
6824        //  3: aaaaaa
6825        //  4: bbbbbb
6826        //  5: cccccc
6827        //  6:
6828        //  7: [[footer]]
6829        //  8: [[header]]
6830        //  9: ffffff
6831        // 10: gggggg
6832        // 11: hhhhhh
6833        // 12:
6834        // 13: [[footer]]
6835        // 14: [[file
6836        // 15:   header
6837        // 16:   section]]
6838        // 17: bbbbbb
6839        // 18: cccccc
6840        // 19: dddddd
6841        // 20: [[footer]]
6842        let window = cx.add_window(|cx| {
6843            let buffer = MultiBuffer::build_multi(
6844                [
6845                    (
6846                        &(sample_text(8, 6, 'a') + "\n"),
6847                        vec![
6848                            Point::new(0, 0)..Point::new(3, 0),
6849                            Point::new(4, 0)..Point::new(7, 0),
6850                        ],
6851                    ),
6852                    (
6853                        &(sample_text(8, 6, 'a') + "\n"),
6854                        vec![Point::new(1, 0)..Point::new(3, 0)],
6855                    ),
6856                ],
6857                cx,
6858            );
6859            Editor::new(EditorMode::Full, buffer, None, true, cx)
6860        });
6861        let editor = window.root(cx).unwrap();
6862        let style = cx.update(|cx| editor.read(cx).style().unwrap().clone());
6863        let _state = window.update(cx, |editor, cx| {
6864            editor.cursor_shape = CursorShape::Block;
6865            editor.change_selections(None, cx, |s| {
6866                s.select_display_ranges([
6867                    DisplayPoint::new(DisplayRow(4), 0)..DisplayPoint::new(DisplayRow(7), 0),
6868                    DisplayPoint::new(DisplayRow(10), 0)..DisplayPoint::new(DisplayRow(13), 0),
6869                ]);
6870            });
6871        });
6872
6873        let (_, state) = cx.draw(point(px(500.), px(500.)), size(px(500.), px(500.)), |_| {
6874            EditorElement::new(&editor, style)
6875        });
6876        assert_eq!(state.selections.len(), 1);
6877        let local_selections = &state.selections[0].1;
6878        assert_eq!(local_selections.len(), 2);
6879
6880        // moves cursor on excerpt boundary back a line
6881        // and doesn't allow selection to bleed through
6882        assert_eq!(
6883            local_selections[0].range,
6884            DisplayPoint::new(DisplayRow(4), 0)..DisplayPoint::new(DisplayRow(7), 0)
6885        );
6886        assert_eq!(
6887            local_selections[0].head,
6888            DisplayPoint::new(DisplayRow(6), 0)
6889        );
6890        // moves cursor on buffer boundary back two lines
6891        // and doesn't allow selection to bleed through
6892        assert_eq!(
6893            local_selections[1].range,
6894            DisplayPoint::new(DisplayRow(10), 0)..DisplayPoint::new(DisplayRow(13), 0)
6895        );
6896        assert_eq!(
6897            local_selections[1].head,
6898            DisplayPoint::new(DisplayRow(12), 0)
6899        );
6900    }
6901
6902    #[gpui::test]
6903    fn test_layout_with_placeholder_text_and_blocks(cx: &mut TestAppContext) {
6904        init_test(cx, |_| {});
6905
6906        let window = cx.add_window(|cx| {
6907            let buffer = MultiBuffer::build_simple("", cx);
6908            Editor::new(EditorMode::Full, buffer, None, true, cx)
6909        });
6910        let cx = &mut VisualTestContext::from_window(*window, cx);
6911        let editor = window.root(cx).unwrap();
6912        let style = cx.update(|cx| editor.read(cx).style().unwrap().clone());
6913        window
6914            .update(cx, |editor, cx| {
6915                editor.set_placeholder_text("hello", cx);
6916                editor.insert_blocks(
6917                    [BlockProperties {
6918                        style: BlockStyle::Fixed,
6919                        placement: BlockPlacement::Above(Anchor::min()),
6920                        height: 3,
6921                        render: Arc::new(|cx| div().h(3. * cx.line_height()).into_any()),
6922                        priority: 0,
6923                    }],
6924                    None,
6925                    cx,
6926                );
6927
6928                // Blur the editor so that it displays placeholder text.
6929                cx.blur();
6930            })
6931            .unwrap();
6932
6933        let (_, state) = cx.draw(point(px(500.), px(500.)), size(px(500.), px(500.)), |_| {
6934            EditorElement::new(&editor, style)
6935        });
6936        assert_eq!(state.position_map.line_layouts.len(), 4);
6937        assert_eq!(
6938            state
6939                .line_numbers
6940                .iter()
6941                .map(Option::is_some)
6942                .collect::<Vec<_>>(),
6943            &[false, false, false, true]
6944        );
6945    }
6946
6947    #[gpui::test]
6948    fn test_all_invisibles_drawing(cx: &mut TestAppContext) {
6949        const TAB_SIZE: u32 = 4;
6950
6951        let input_text = "\t \t|\t| a b";
6952        let expected_invisibles = vec![
6953            Invisible::Tab {
6954                line_start_offset: 0,
6955                line_end_offset: TAB_SIZE as usize,
6956            },
6957            Invisible::Whitespace {
6958                line_offset: TAB_SIZE as usize,
6959            },
6960            Invisible::Tab {
6961                line_start_offset: TAB_SIZE as usize + 1,
6962                line_end_offset: TAB_SIZE as usize * 2,
6963            },
6964            Invisible::Tab {
6965                line_start_offset: TAB_SIZE as usize * 2 + 1,
6966                line_end_offset: TAB_SIZE as usize * 3,
6967            },
6968            Invisible::Whitespace {
6969                line_offset: TAB_SIZE as usize * 3 + 1,
6970            },
6971            Invisible::Whitespace {
6972                line_offset: TAB_SIZE as usize * 3 + 3,
6973            },
6974        ];
6975        assert_eq!(
6976            expected_invisibles.len(),
6977            input_text
6978                .chars()
6979                .filter(|initial_char| initial_char.is_whitespace())
6980                .count(),
6981            "Hardcoded expected invisibles differ from the actual ones in '{input_text}'"
6982        );
6983
6984        for show_line_numbers in [true, false] {
6985            init_test(cx, |s| {
6986                s.defaults.show_whitespaces = Some(ShowWhitespaceSetting::All);
6987                s.defaults.tab_size = NonZeroU32::new(TAB_SIZE);
6988            });
6989
6990            let actual_invisibles = collect_invisibles_from_new_editor(
6991                cx,
6992                EditorMode::Full,
6993                input_text,
6994                px(500.0),
6995                show_line_numbers,
6996            );
6997
6998            assert_eq!(expected_invisibles, actual_invisibles);
6999        }
7000    }
7001
7002    #[gpui::test]
7003    fn test_invisibles_dont_appear_in_certain_editors(cx: &mut TestAppContext) {
7004        init_test(cx, |s| {
7005            s.defaults.show_whitespaces = Some(ShowWhitespaceSetting::All);
7006            s.defaults.tab_size = NonZeroU32::new(4);
7007        });
7008
7009        for editor_mode_without_invisibles in [
7010            EditorMode::SingleLine { auto_width: false },
7011            EditorMode::AutoHeight { max_lines: 100 },
7012        ] {
7013            for show_line_numbers in [true, false] {
7014                let invisibles = collect_invisibles_from_new_editor(
7015                    cx,
7016                    editor_mode_without_invisibles,
7017                    "\t\t\t| | a b",
7018                    px(500.0),
7019                    show_line_numbers,
7020                );
7021                assert!(invisibles.is_empty(),
7022                    "For editor mode {editor_mode_without_invisibles:?} no invisibles was expected but got {invisibles:?}");
7023            }
7024        }
7025    }
7026
7027    #[gpui::test]
7028    fn test_wrapped_invisibles_drawing(cx: &mut TestAppContext) {
7029        let tab_size = 4;
7030        let input_text = "a\tbcd     ".repeat(9);
7031        let repeated_invisibles = [
7032            Invisible::Tab {
7033                line_start_offset: 1,
7034                line_end_offset: tab_size as usize,
7035            },
7036            Invisible::Whitespace {
7037                line_offset: tab_size as usize + 3,
7038            },
7039            Invisible::Whitespace {
7040                line_offset: tab_size as usize + 4,
7041            },
7042            Invisible::Whitespace {
7043                line_offset: tab_size as usize + 5,
7044            },
7045            Invisible::Whitespace {
7046                line_offset: tab_size as usize + 6,
7047            },
7048            Invisible::Whitespace {
7049                line_offset: tab_size as usize + 7,
7050            },
7051        ];
7052        let expected_invisibles = std::iter::once(repeated_invisibles)
7053            .cycle()
7054            .take(9)
7055            .flatten()
7056            .collect::<Vec<_>>();
7057        assert_eq!(
7058            expected_invisibles.len(),
7059            input_text
7060                .chars()
7061                .filter(|initial_char| initial_char.is_whitespace())
7062                .count(),
7063            "Hardcoded expected invisibles differ from the actual ones in '{input_text}'"
7064        );
7065        info!("Expected invisibles: {expected_invisibles:?}");
7066
7067        init_test(cx, |_| {});
7068
7069        // Put the same string with repeating whitespace pattern into editors of various size,
7070        // take deliberately small steps during resizing, to put all whitespace kinds near the wrap point.
7071        let resize_step = 10.0;
7072        let mut editor_width = 200.0;
7073        while editor_width <= 1000.0 {
7074            for show_line_numbers in [true, false] {
7075                update_test_language_settings(cx, |s| {
7076                    s.defaults.tab_size = NonZeroU32::new(tab_size);
7077                    s.defaults.show_whitespaces = Some(ShowWhitespaceSetting::All);
7078                    s.defaults.preferred_line_length = Some(editor_width as u32);
7079                    s.defaults.soft_wrap = Some(language_settings::SoftWrap::PreferredLineLength);
7080                });
7081
7082                let actual_invisibles = collect_invisibles_from_new_editor(
7083                    cx,
7084                    EditorMode::Full,
7085                    &input_text,
7086                    px(editor_width),
7087                    show_line_numbers,
7088                );
7089
7090                // Whatever the editor size is, ensure it has the same invisible kinds in the same order
7091                // (no good guarantees about the offsets: wrapping could trigger padding and its tests should check the offsets).
7092                let mut i = 0;
7093                for (actual_index, actual_invisible) in actual_invisibles.iter().enumerate() {
7094                    i = actual_index;
7095                    match expected_invisibles.get(i) {
7096                        Some(expected_invisible) => match (expected_invisible, actual_invisible) {
7097                            (Invisible::Whitespace { .. }, Invisible::Whitespace { .. })
7098                            | (Invisible::Tab { .. }, Invisible::Tab { .. }) => {}
7099                            _ => {
7100                                panic!("At index {i}, expected invisible {expected_invisible:?} does not match actual {actual_invisible:?} by kind. Actual invisibles: {actual_invisibles:?}")
7101                            }
7102                        },
7103                        None => {
7104                            panic!("Unexpected extra invisible {actual_invisible:?} at index {i}")
7105                        }
7106                    }
7107                }
7108                let missing_expected_invisibles = &expected_invisibles[i + 1..];
7109                assert!(
7110                    missing_expected_invisibles.is_empty(),
7111                    "Missing expected invisibles after index {i}: {missing_expected_invisibles:?}"
7112                );
7113
7114                editor_width += resize_step;
7115            }
7116        }
7117    }
7118
7119    #[gpui::test]
7120    fn test_inline_completion_popover_text(cx: &mut TestAppContext) {
7121        init_test(cx, |_| {});
7122
7123        // Test case 1: Simple insertion
7124        {
7125            let window = cx.add_window(|cx| {
7126                let buffer = MultiBuffer::build_simple("Hello, world!", cx);
7127                Editor::new(EditorMode::Full, buffer, None, true, cx)
7128            });
7129            let cx = &mut VisualTestContext::from_window(*window, cx);
7130
7131            window
7132                .update(cx, |editor, cx| {
7133                    let snapshot = editor.snapshot(cx);
7134                    let edit_range = snapshot.buffer_snapshot.anchor_after(Point::new(0, 6))
7135                        ..snapshot.buffer_snapshot.anchor_before(Point::new(0, 6));
7136                    let edits = vec![(edit_range, " beautiful".to_string())];
7137
7138                    let (text, highlights) = inline_completion_popover_text(&snapshot, &edits, cx);
7139
7140                    assert_eq!(text, "Hello, beautiful world!");
7141                    assert_eq!(highlights.len(), 1);
7142                    assert_eq!(highlights[0].0, 6..16);
7143                    assert_eq!(
7144                        highlights[0].1.background_color,
7145                        Some(cx.theme().status().created_background)
7146                    );
7147                })
7148                .unwrap();
7149        }
7150
7151        // Test case 2: Replacement
7152        {
7153            let window = cx.add_window(|cx| {
7154                let buffer = MultiBuffer::build_simple("This is a test.", cx);
7155                Editor::new(EditorMode::Full, buffer, None, true, cx)
7156            });
7157            let cx = &mut VisualTestContext::from_window(*window, cx);
7158
7159            window
7160                .update(cx, |editor, cx| {
7161                    let snapshot = editor.snapshot(cx);
7162                    let edits = vec![(
7163                        snapshot.buffer_snapshot.anchor_after(Point::new(0, 0))
7164                            ..snapshot.buffer_snapshot.anchor_before(Point::new(0, 4)),
7165                        "That".to_string(),
7166                    )];
7167
7168                    let (text, highlights) = inline_completion_popover_text(&snapshot, &edits, cx);
7169
7170                    assert_eq!(text, "That is a test.");
7171                    assert_eq!(highlights.len(), 1);
7172                    assert_eq!(highlights[0].0, 0..4);
7173                    assert_eq!(
7174                        highlights[0].1.background_color,
7175                        Some(cx.theme().status().created_background)
7176                    );
7177                })
7178                .unwrap();
7179        }
7180
7181        // Test case 3: Multiple edits
7182        {
7183            let window = cx.add_window(|cx| {
7184                let buffer = MultiBuffer::build_simple("Hello, world!", cx);
7185                Editor::new(EditorMode::Full, buffer, None, true, cx)
7186            });
7187            let cx = &mut VisualTestContext::from_window(*window, cx);
7188
7189            window
7190                .update(cx, |editor, cx| {
7191                    let snapshot = editor.snapshot(cx);
7192                    let edits = vec![
7193                        (
7194                            snapshot.buffer_snapshot.anchor_after(Point::new(0, 0))
7195                                ..snapshot.buffer_snapshot.anchor_before(Point::new(0, 5)),
7196                            "Greetings".into(),
7197                        ),
7198                        (
7199                            snapshot.buffer_snapshot.anchor_after(Point::new(0, 12))
7200                                ..snapshot.buffer_snapshot.anchor_before(Point::new(0, 12)),
7201                            " and universe".into(),
7202                        ),
7203                    ];
7204
7205                    let (text, highlights) = inline_completion_popover_text(&snapshot, &edits, cx);
7206
7207                    assert_eq!(text, "Greetings, world and universe!");
7208                    assert_eq!(highlights.len(), 2);
7209                    assert_eq!(highlights[0].0, 0..9);
7210                    assert_eq!(highlights[1].0, 16..29);
7211                    assert_eq!(
7212                        highlights[0].1.background_color,
7213                        Some(cx.theme().status().created_background)
7214                    );
7215                    assert_eq!(
7216                        highlights[1].1.background_color,
7217                        Some(cx.theme().status().created_background)
7218                    );
7219                })
7220                .unwrap();
7221        }
7222
7223        // Test case 4: Multiple lines with edits
7224        {
7225            let window = cx.add_window(|cx| {
7226                let buffer = MultiBuffer::build_simple(
7227                    "First line\nSecond line\nThird line\nFourth line",
7228                    cx,
7229                );
7230                Editor::new(EditorMode::Full, buffer, None, true, cx)
7231            });
7232            let cx = &mut VisualTestContext::from_window(*window, cx);
7233
7234            window
7235                .update(cx, |editor, cx| {
7236                    let snapshot = editor.snapshot(cx);
7237                    let edits = vec![
7238                        (
7239                            snapshot.buffer_snapshot.anchor_before(Point::new(1, 7))
7240                                ..snapshot.buffer_snapshot.anchor_before(Point::new(1, 11)),
7241                            "modified".to_string(),
7242                        ),
7243                        (
7244                            snapshot.buffer_snapshot.anchor_before(Point::new(2, 0))
7245                                ..snapshot.buffer_snapshot.anchor_before(Point::new(2, 10)),
7246                            "New third line".to_string(),
7247                        ),
7248                        (
7249                            snapshot.buffer_snapshot.anchor_before(Point::new(3, 6))
7250                                ..snapshot.buffer_snapshot.anchor_before(Point::new(3, 6)),
7251                            " updated".to_string(),
7252                        ),
7253                    ];
7254
7255                    let (text, highlights) = inline_completion_popover_text(&snapshot, &edits, cx);
7256
7257                    assert_eq!(text, "Second modified\nNew third line\nFourth updated line");
7258                    assert_eq!(highlights.len(), 3);
7259                    assert_eq!(highlights[0].0, 7..15); // "modified"
7260                    assert_eq!(highlights[1].0, 16..30); // "New third line"
7261                    assert_eq!(highlights[2].0, 37..45); // " updated"
7262
7263                    for highlight in &highlights {
7264                        assert_eq!(
7265                            highlight.1.background_color,
7266                            Some(cx.theme().status().created_background)
7267                        );
7268                    }
7269                })
7270                .unwrap();
7271        }
7272    }
7273
7274    fn collect_invisibles_from_new_editor(
7275        cx: &mut TestAppContext,
7276        editor_mode: EditorMode,
7277        input_text: &str,
7278        editor_width: Pixels,
7279        show_line_numbers: bool,
7280    ) -> Vec<Invisible> {
7281        info!(
7282            "Creating editor with mode {editor_mode:?}, width {}px and text '{input_text}'",
7283            editor_width.0
7284        );
7285        let window = cx.add_window(|cx| {
7286            let buffer = MultiBuffer::build_simple(input_text, cx);
7287            Editor::new(editor_mode, buffer, None, true, cx)
7288        });
7289        let cx = &mut VisualTestContext::from_window(*window, cx);
7290        let editor = window.root(cx).unwrap();
7291
7292        let style = cx.update(|cx| editor.read(cx).style().unwrap().clone());
7293        window
7294            .update(cx, |editor, cx| {
7295                editor.set_soft_wrap_mode(language_settings::SoftWrap::EditorWidth, cx);
7296                editor.set_wrap_width(Some(editor_width), cx);
7297                editor.set_show_line_numbers(show_line_numbers, cx);
7298            })
7299            .unwrap();
7300        let (_, state) = cx.draw(point(px(500.), px(500.)), size(px(500.), px(500.)), |_| {
7301            EditorElement::new(&editor, style)
7302        });
7303        state
7304            .position_map
7305            .line_layouts
7306            .iter()
7307            .flat_map(|line_with_invisibles| &line_with_invisibles.invisibles)
7308            .cloned()
7309            .collect()
7310    }
7311}