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