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