1use super::{
   2    display_map::{BlockContext, ToDisplayPoint},
   3    Anchor, DisplayPoint, Editor, EditorMode, EditorSnapshot, SelectPhase, SoftWrap, ToPoint,
   4    MAX_LINE_LEN,
   5};
   6use crate::{
   7    display_map::{BlockStyle, DisplaySnapshot, FoldStatus, InlayOffset, TransformBlock},
   8    editor_settings::ShowScrollbar,
   9    git::{diff_hunk_to_display, DisplayDiffHunk},
  10    hover_popover::{
  11        hide_hover, hover_at, HOVER_POPOVER_GAP, MIN_POPOVER_CHARACTER_WIDTH,
  12        MIN_POPOVER_LINE_HEIGHT,
  13    },
  14    link_go_to_definition::{
  15        go_to_fetched_definition, go_to_fetched_type_definition, update_go_to_definition_link,
  16    },
  17    mouse_context_menu, EditorSettings, EditorStyle, GutterHover, UnfoldAt,
  18};
  19use clock::ReplicaId;
  20use collections::{BTreeMap, HashMap};
  21use git::diff::DiffHunkStatus;
  22use gpui::{
  23    color::Color,
  24    elements::*,
  25    fonts::{HighlightStyle, TextStyle, Underline},
  26    geometry::{
  27        rect::RectF,
  28        vector::{vec2f, Vector2F},
  29        PathBuilder,
  30    },
  31    json::{self, ToJson},
  32    platform::{CursorStyle, Modifiers, MouseButton, MouseButtonEvent, MouseMovedEvent},
  33    text_layout::{self, Line, RunStyle, TextLayoutCache},
  34    AnyElement, Axis, Border, CursorRegion, Element, EventContext, FontCache, LayoutContext,
  35    MouseRegion, PaintContext, Quad, SceneBuilder, SizeConstraint, ViewContext, WindowContext,
  36};
  37use itertools::Itertools;
  38use json::json;
  39use language::{
  40    language_settings::ShowWhitespaceSetting, Bias, CursorShape, DiagnosticSeverity, OffsetUtf16,
  41    Selection,
  42};
  43use project::{
  44    project_settings::{GitGutterSetting, ProjectSettings},
  45    InlayHintLabelPart, ProjectPath,
  46};
  47use smallvec::SmallVec;
  48use std::{
  49    borrow::Cow,
  50    cmp::{self, Ordering},
  51    fmt::Write,
  52    iter,
  53    ops::Range,
  54    sync::Arc,
  55};
  56use text::Point;
  57use workspace::item::Item;
  58
  59enum FoldMarkers {}
  60
  61struct SelectionLayout {
  62    head: DisplayPoint,
  63    cursor_shape: CursorShape,
  64    is_newest: bool,
  65    is_local: bool,
  66    range: Range<DisplayPoint>,
  67    active_rows: Range<u32>,
  68}
  69
  70impl SelectionLayout {
  71    fn new<T: ToPoint + ToDisplayPoint + Clone>(
  72        selection: Selection<T>,
  73        line_mode: bool,
  74        cursor_shape: CursorShape,
  75        map: &DisplaySnapshot,
  76        is_newest: bool,
  77        is_local: bool,
  78    ) -> Self {
  79        let point_selection = selection.map(|p| p.to_point(&map.buffer_snapshot));
  80        let display_selection = point_selection.map(|p| p.to_display_point(map));
  81        let mut range = display_selection.range();
  82        let mut head = display_selection.head();
  83        let mut active_rows = map.prev_line_boundary(point_selection.start).1.row()
  84            ..map.next_line_boundary(point_selection.end).1.row();
  85
  86        // vim visual line mode
  87        if line_mode {
  88            let point_range = map.expand_to_line(point_selection.range());
  89            range = point_range.start.to_display_point(map)..point_range.end.to_display_point(map);
  90        }
  91
  92        // any vim visual mode (including line mode)
  93        if cursor_shape == CursorShape::Block && !range.is_empty() && !selection.reversed {
  94            if head.column() > 0 {
  95                head = map.clip_point(DisplayPoint::new(head.row(), head.column() - 1), Bias::Left)
  96            } else if head.row() > 0 && head != map.max_point() {
  97                head = map.clip_point(
  98                    DisplayPoint::new(head.row() - 1, map.line_len(head.row() - 1)),
  99                    Bias::Left,
 100                );
 101                // updating range.end is a no-op unless you're cursor is
 102                // on the newline containing a multi-buffer divider
 103                // in which case the clip_point may have moved the head up
 104                // an additional row.
 105                range.end = DisplayPoint::new(head.row() + 1, 0);
 106                active_rows.end = head.row();
 107            }
 108        }
 109
 110        Self {
 111            head,
 112            cursor_shape,
 113            is_newest,
 114            is_local,
 115            range,
 116            active_rows,
 117        }
 118    }
 119}
 120
 121pub struct EditorElement {
 122    style: Arc<EditorStyle>,
 123}
 124
 125impl EditorElement {
 126    pub fn new(style: EditorStyle) -> Self {
 127        Self {
 128            style: Arc::new(style),
 129        }
 130    }
 131
 132    fn attach_mouse_handlers(
 133        scene: &mut SceneBuilder,
 134        position_map: &Arc<PositionMap>,
 135        has_popovers: bool,
 136        visible_bounds: RectF,
 137        text_bounds: RectF,
 138        gutter_bounds: RectF,
 139        bounds: RectF,
 140        cx: &mut ViewContext<Editor>,
 141    ) {
 142        enum EditorElementMouseHandlers {}
 143        scene.push_mouse_region(
 144            MouseRegion::new::<EditorElementMouseHandlers>(
 145                cx.view_id(),
 146                cx.view_id(),
 147                visible_bounds,
 148            )
 149            .on_down(MouseButton::Left, {
 150                let position_map = position_map.clone();
 151                move |event, editor, cx| {
 152                    if !Self::mouse_down(
 153                        editor,
 154                        event.platform_event,
 155                        position_map.as_ref(),
 156                        text_bounds,
 157                        gutter_bounds,
 158                        cx,
 159                    ) {
 160                        cx.propagate_event();
 161                    }
 162                }
 163            })
 164            .on_down(MouseButton::Right, {
 165                let position_map = position_map.clone();
 166                move |event, editor, cx| {
 167                    if !Self::mouse_right_down(
 168                        editor,
 169                        event.position,
 170                        position_map.as_ref(),
 171                        text_bounds,
 172                        cx,
 173                    ) {
 174                        cx.propagate_event();
 175                    }
 176                }
 177            })
 178            .on_up(MouseButton::Left, {
 179                let position_map = position_map.clone();
 180                move |event, editor, cx| {
 181                    if !Self::mouse_up(
 182                        editor,
 183                        event.position,
 184                        event.cmd,
 185                        event.shift,
 186                        event.alt,
 187                        position_map.as_ref(),
 188                        text_bounds,
 189                        cx,
 190                    ) {
 191                        cx.propagate_event()
 192                    }
 193                }
 194            })
 195            .on_drag(MouseButton::Left, {
 196                let position_map = position_map.clone();
 197                move |event, editor, cx| {
 198                    if event.end {
 199                        return;
 200                    }
 201
 202                    if !Self::mouse_dragged(
 203                        editor,
 204                        event.platform_event,
 205                        position_map.as_ref(),
 206                        text_bounds,
 207                        cx,
 208                    ) {
 209                        cx.propagate_event()
 210                    }
 211                }
 212            })
 213            .on_move({
 214                let position_map = position_map.clone();
 215                move |event, editor, cx| {
 216                    if !Self::mouse_moved(
 217                        editor,
 218                        event.platform_event,
 219                        &position_map,
 220                        text_bounds,
 221                        cx,
 222                    ) {
 223                        cx.propagate_event()
 224                    }
 225                }
 226            })
 227            .on_move_out(move |_, editor: &mut Editor, cx| {
 228                if has_popovers {
 229                    hide_hover(editor, cx);
 230                }
 231            })
 232            .on_scroll({
 233                let position_map = position_map.clone();
 234                move |event, editor, cx| {
 235                    if !Self::scroll(
 236                        editor,
 237                        event.position,
 238                        *event.delta.raw(),
 239                        event.delta.precise(),
 240                        &position_map,
 241                        bounds,
 242                        cx,
 243                    ) {
 244                        cx.propagate_event()
 245                    }
 246                }
 247            }),
 248        );
 249
 250        enum GutterHandlers {}
 251        scene.push_mouse_region(
 252            MouseRegion::new::<GutterHandlers>(cx.view_id(), cx.view_id() + 1, gutter_bounds)
 253                .on_hover(|hover, editor: &mut Editor, cx| {
 254                    editor.gutter_hover(
 255                        &GutterHover {
 256                            hovered: hover.started,
 257                        },
 258                        cx,
 259                    );
 260                }),
 261        )
 262    }
 263
 264    fn mouse_down(
 265        editor: &mut Editor,
 266        MouseButtonEvent {
 267            position,
 268            modifiers:
 269                Modifiers {
 270                    shift,
 271                    ctrl,
 272                    alt,
 273                    cmd,
 274                    ..
 275                },
 276            mut click_count,
 277            ..
 278        }: MouseButtonEvent,
 279        position_map: &PositionMap,
 280        text_bounds: RectF,
 281        gutter_bounds: RectF,
 282        cx: &mut EventContext<Editor>,
 283    ) -> bool {
 284        if gutter_bounds.contains_point(position) {
 285            click_count = 3; // Simulate triple-click when clicking the gutter to select lines
 286        } else if !text_bounds.contains_point(position) {
 287            return false;
 288        }
 289
 290        let point_for_position = position_map.point_for_position(text_bounds, position);
 291        let position = point_for_position.previous_valid;
 292        if shift && alt {
 293            editor.select(
 294                SelectPhase::BeginColumnar {
 295                    position,
 296                    goal_column: point_for_position.exact_unclipped.column(),
 297                },
 298                cx,
 299            );
 300        } else if shift && !ctrl && !alt && !cmd {
 301            editor.select(
 302                SelectPhase::Extend {
 303                    position,
 304                    click_count,
 305                },
 306                cx,
 307            );
 308        } else {
 309            editor.select(
 310                SelectPhase::Begin {
 311                    position,
 312                    add: alt,
 313                    click_count,
 314                },
 315                cx,
 316            );
 317        }
 318
 319        true
 320    }
 321
 322    fn mouse_right_down(
 323        editor: &mut Editor,
 324        position: Vector2F,
 325        position_map: &PositionMap,
 326        text_bounds: RectF,
 327        cx: &mut EventContext<Editor>,
 328    ) -> bool {
 329        if !text_bounds.contains_point(position) {
 330            return false;
 331        }
 332        let point_for_position = position_map.point_for_position(text_bounds, position);
 333        mouse_context_menu::deploy_context_menu(
 334            editor,
 335            position,
 336            point_for_position.previous_valid,
 337            cx,
 338        );
 339        true
 340    }
 341
 342    fn mouse_up(
 343        editor: &mut Editor,
 344        position: Vector2F,
 345        cmd: bool,
 346        shift: bool,
 347        alt: bool,
 348        position_map: &PositionMap,
 349        text_bounds: RectF,
 350        cx: &mut EventContext<Editor>,
 351    ) -> bool {
 352        let end_selection = editor.has_pending_selection();
 353        let pending_nonempty_selections = editor.has_pending_nonempty_selection();
 354
 355        if end_selection {
 356            editor.select(SelectPhase::End, cx);
 357        }
 358
 359        if !pending_nonempty_selections && cmd && text_bounds.contains_point(position) {
 360            if let Some(point) = position_map
 361                .point_for_position(text_bounds, position)
 362                .as_valid()
 363            {
 364                if shift {
 365                    go_to_fetched_type_definition(editor, point, alt, cx);
 366                } else {
 367                    go_to_fetched_definition(editor, point, alt, cx);
 368                }
 369
 370                return true;
 371            }
 372        }
 373
 374        end_selection
 375    }
 376
 377    fn mouse_dragged(
 378        editor: &mut Editor,
 379        MouseMovedEvent {
 380            modifiers: Modifiers { cmd, shift, .. },
 381            position,
 382            ..
 383        }: MouseMovedEvent,
 384        position_map: &PositionMap,
 385        text_bounds: RectF,
 386        cx: &mut EventContext<Editor>,
 387    ) -> bool {
 388        // This will be handled more correctly once https://github.com/zed-industries/zed/issues/1218 is completed
 389        // Don't trigger hover popover if mouse is hovering over context menu
 390        let point = if text_bounds.contains_point(position) {
 391            position_map
 392                .point_for_position(text_bounds, position)
 393                .as_valid()
 394        } else {
 395            None
 396        };
 397
 398        update_go_to_definition_link(editor, point, cmd, shift, cx);
 399
 400        if editor.has_pending_selection() {
 401            let mut scroll_delta = Vector2F::zero();
 402
 403            let vertical_margin = position_map.line_height.min(text_bounds.height() / 3.0);
 404            let top = text_bounds.origin_y() + vertical_margin;
 405            let bottom = text_bounds.lower_left().y() - vertical_margin;
 406            if position.y() < top {
 407                scroll_delta.set_y(-scale_vertical_mouse_autoscroll_delta(top - position.y()))
 408            }
 409            if position.y() > bottom {
 410                scroll_delta.set_y(scale_vertical_mouse_autoscroll_delta(position.y() - bottom))
 411            }
 412
 413            let horizontal_margin = position_map.line_height.min(text_bounds.width() / 3.0);
 414            let left = text_bounds.origin_x() + horizontal_margin;
 415            let right = text_bounds.upper_right().x() - horizontal_margin;
 416            if position.x() < left {
 417                scroll_delta.set_x(-scale_horizontal_mouse_autoscroll_delta(
 418                    left - position.x(),
 419                ))
 420            }
 421            if position.x() > right {
 422                scroll_delta.set_x(scale_horizontal_mouse_autoscroll_delta(
 423                    position.x() - right,
 424                ))
 425            }
 426
 427            let point_for_position = position_map.point_for_position(text_bounds, position);
 428
 429            editor.select(
 430                SelectPhase::Update {
 431                    position: point_for_position.previous_valid,
 432                    goal_column: point_for_position.exact_unclipped.column(),
 433                    scroll_position: (position_map.snapshot.scroll_position() + scroll_delta)
 434                        .clamp(Vector2F::zero(), position_map.scroll_max),
 435                },
 436                cx,
 437            );
 438            hover_at(editor, point, cx);
 439            true
 440        } else {
 441            hover_at(editor, point, cx);
 442            false
 443        }
 444    }
 445
 446    fn mouse_moved(
 447        editor: &mut Editor,
 448        MouseMovedEvent {
 449            modifiers: Modifiers { shift, cmd, .. },
 450            position,
 451            ..
 452        }: MouseMovedEvent,
 453        position_map: &PositionMap,
 454        text_bounds: RectF,
 455        cx: &mut ViewContext<Editor>,
 456    ) -> bool {
 457        // This will be handled more correctly once https://github.com/zed-industries/zed/issues/1218 is completed
 458        // Don't trigger hover popover if mouse is hovering over context menu
 459        if text_bounds.contains_point(position) {
 460            let point_for_position = position_map.point_for_position(text_bounds, position);
 461            if let Some(point) = point_for_position.as_valid() {
 462                update_go_to_definition_link(editor, Some(point), cmd, shift, cx);
 463                hover_at(editor, Some(point), cx);
 464                return true;
 465            } else {
 466                let hint_start_offset = position_map
 467                    .snapshot
 468                    .display_point_to_inlay_offset(point_for_position.previous_valid, Bias::Left);
 469                let hint_end_offset = position_map
 470                    .snapshot
 471                    .display_point_to_inlay_offset(point_for_position.next_valid, Bias::Right);
 472                let offset_overshoot = point_for_position.column_overshoot_after_line_end as usize;
 473                let hovered_offset = if offset_overshoot == 0 {
 474                    Some(position_map.snapshot.display_point_to_inlay_offset(
 475                        point_for_position.exact_unclipped,
 476                        Bias::Left,
 477                    ))
 478                } else if (hint_end_offset - hint_start_offset).0 >= offset_overshoot {
 479                    Some(InlayOffset(hint_start_offset.0 + offset_overshoot))
 480                } else {
 481                    None
 482                };
 483                if let Some(hovered_offset) = hovered_offset {
 484                    let buffer = editor.buffer().read(cx);
 485                    let snapshot = buffer.snapshot(cx);
 486                    let previous_valid_anchor = snapshot.anchor_at(
 487                        point_for_position
 488                            .previous_valid
 489                            .to_point(&position_map.snapshot.display_snapshot),
 490                        Bias::Left,
 491                    );
 492                    let next_valid_anchor = snapshot.anchor_at(
 493                        point_for_position
 494                            .next_valid
 495                            .to_point(&position_map.snapshot.display_snapshot),
 496                        Bias::Right,
 497                    );
 498                    if let Some(hovered_hint) = editor
 499                        .visible_inlay_hints(cx)
 500                        .into_iter()
 501                        .skip_while(|hint| {
 502                            hint.position.cmp(&previous_valid_anchor, &snapshot).is_lt()
 503                        })
 504                        .take_while(|hint| hint.position.cmp(&next_valid_anchor, &snapshot).is_le())
 505                        .max_by_key(|hint| hint.id)
 506                    {
 507                        if let Some(cached_hint) = editor
 508                            .inlay_hint_cache()
 509                            .hint_by_id(previous_valid_anchor.excerpt_id, hovered_hint.id)
 510                        {
 511                            match &cached_hint.label {
 512                                project::InlayHintLabel::String(regular_label) => {
 513                                    // TODO kb remove + check for tooltip for hover and resolve, if needed
 514                                    eprintln!("regular string: {regular_label}");
 515                                }
 516                                project::InlayHintLabel::LabelParts(label_parts) => {
 517                                    if let Some(hovered_hint_part) = find_hovered_hint_part(
 518                                        &label_parts,
 519                                        hint_start_offset..hint_end_offset,
 520                                        hovered_offset,
 521                                    ) {
 522                                        // TODO kb remove + check for tooltip and location and resolve, if needed
 523                                        eprintln!("hint_part: {hovered_hint_part:?}");
 524                                    }
 525                                }
 526                            };
 527                        }
 528                    }
 529                }
 530            }
 531        };
 532
 533        update_go_to_definition_link(editor, None, cmd, shift, cx);
 534        hover_at(editor, None, cx);
 535        true
 536    }
 537
 538    fn scroll(
 539        editor: &mut Editor,
 540        position: Vector2F,
 541        mut delta: Vector2F,
 542        precise: bool,
 543        position_map: &PositionMap,
 544        bounds: RectF,
 545        cx: &mut ViewContext<Editor>,
 546    ) -> bool {
 547        if !bounds.contains_point(position) {
 548            return false;
 549        }
 550
 551        let line_height = position_map.line_height;
 552        let max_glyph_width = position_map.em_width;
 553
 554        let axis = if precise {
 555            //Trackpad
 556            position_map.snapshot.ongoing_scroll.filter(&mut delta)
 557        } else {
 558            //Not trackpad
 559            delta *= vec2f(max_glyph_width, line_height);
 560            None //Resets ongoing scroll
 561        };
 562
 563        let scroll_position = position_map.snapshot.scroll_position();
 564        let x = (scroll_position.x() * max_glyph_width - delta.x()) / max_glyph_width;
 565        let y = (scroll_position.y() * line_height - delta.y()) / line_height;
 566        let scroll_position = vec2f(x, y).clamp(Vector2F::zero(), position_map.scroll_max);
 567        editor.scroll(scroll_position, axis, cx);
 568
 569        true
 570    }
 571
 572    fn paint_background(
 573        &self,
 574        scene: &mut SceneBuilder,
 575        gutter_bounds: RectF,
 576        text_bounds: RectF,
 577        layout: &LayoutState,
 578    ) {
 579        let bounds = gutter_bounds.union_rect(text_bounds);
 580        let scroll_top =
 581            layout.position_map.snapshot.scroll_position().y() * layout.position_map.line_height;
 582        scene.push_quad(Quad {
 583            bounds: gutter_bounds,
 584            background: Some(self.style.gutter_background),
 585            border: Border::new(0., Color::transparent_black()),
 586            corner_radii: Default::default(),
 587        });
 588        scene.push_quad(Quad {
 589            bounds: text_bounds,
 590            background: Some(self.style.background),
 591            border: Border::new(0., Color::transparent_black()),
 592            corner_radii: Default::default(),
 593        });
 594
 595        if let EditorMode::Full = layout.mode {
 596            let mut active_rows = layout.active_rows.iter().peekable();
 597            while let Some((start_row, contains_non_empty_selection)) = active_rows.next() {
 598                let mut end_row = *start_row;
 599                while active_rows.peek().map_or(false, |r| {
 600                    *r.0 == end_row + 1 && r.1 == contains_non_empty_selection
 601                }) {
 602                    active_rows.next().unwrap();
 603                    end_row += 1;
 604                }
 605
 606                if !contains_non_empty_selection {
 607                    let origin = vec2f(
 608                        bounds.origin_x(),
 609                        bounds.origin_y() + (layout.position_map.line_height * *start_row as f32)
 610                            - scroll_top,
 611                    );
 612                    let size = vec2f(
 613                        bounds.width(),
 614                        layout.position_map.line_height * (end_row - start_row + 1) as f32,
 615                    );
 616                    scene.push_quad(Quad {
 617                        bounds: RectF::new(origin, size),
 618                        background: Some(self.style.active_line_background),
 619                        border: Border::default(),
 620                        corner_radii: Default::default(),
 621                    });
 622                }
 623            }
 624
 625            if let Some(highlighted_rows) = &layout.highlighted_rows {
 626                let origin = vec2f(
 627                    bounds.origin_x(),
 628                    bounds.origin_y()
 629                        + (layout.position_map.line_height * highlighted_rows.start as f32)
 630                        - scroll_top,
 631                );
 632                let size = vec2f(
 633                    bounds.width(),
 634                    layout.position_map.line_height * highlighted_rows.len() as f32,
 635                );
 636                scene.push_quad(Quad {
 637                    bounds: RectF::new(origin, size),
 638                    background: Some(self.style.highlighted_line_background),
 639                    border: Border::default(),
 640                    corner_radii: Default::default(),
 641                });
 642            }
 643
 644            let scroll_left =
 645                layout.position_map.snapshot.scroll_position().x() * layout.position_map.em_width;
 646
 647            for (wrap_position, active) in layout.wrap_guides.iter() {
 648                let x =
 649                    (text_bounds.origin_x() + wrap_position + layout.position_map.em_width / 2.)
 650                        - scroll_left;
 651
 652                if x < text_bounds.origin_x()
 653                    || (layout.show_scrollbars && x > self.scrollbar_left(&bounds))
 654                {
 655                    continue;
 656                }
 657
 658                let color = if *active {
 659                    self.style.active_wrap_guide
 660                } else {
 661                    self.style.wrap_guide
 662                };
 663                scene.push_quad(Quad {
 664                    bounds: RectF::new(
 665                        vec2f(x, text_bounds.origin_y()),
 666                        vec2f(1., text_bounds.height()),
 667                    ),
 668                    background: Some(color),
 669                    border: Border::new(0., Color::transparent_black()),
 670                    corner_radii: Default::default(),
 671                });
 672            }
 673        }
 674    }
 675
 676    fn paint_gutter(
 677        &mut self,
 678        scene: &mut SceneBuilder,
 679        bounds: RectF,
 680        visible_bounds: RectF,
 681        layout: &mut LayoutState,
 682        editor: &mut Editor,
 683        cx: &mut PaintContext<Editor>,
 684    ) {
 685        let line_height = layout.position_map.line_height;
 686
 687        let scroll_position = layout.position_map.snapshot.scroll_position();
 688        let scroll_top = scroll_position.y() * line_height;
 689
 690        let show_gutter = matches!(
 691            settings::get::<ProjectSettings>(cx).git.git_gutter,
 692            Some(GitGutterSetting::TrackedFiles)
 693        );
 694
 695        if show_gutter {
 696            Self::paint_diff_hunks(scene, bounds, layout, cx);
 697        }
 698
 699        for (ix, line) in layout.line_number_layouts.iter().enumerate() {
 700            if let Some(line) = line {
 701                let line_origin = bounds.origin()
 702                    + vec2f(
 703                        bounds.width() - line.width() - layout.gutter_padding,
 704                        ix as f32 * line_height - (scroll_top % line_height),
 705                    );
 706
 707                line.paint(scene, line_origin, visible_bounds, line_height, cx);
 708            }
 709        }
 710
 711        for (ix, fold_indicator) in layout.fold_indicators.iter_mut().enumerate() {
 712            if let Some(indicator) = fold_indicator.as_mut() {
 713                let position = vec2f(
 714                    bounds.width() - layout.gutter_padding,
 715                    ix as f32 * line_height - (scroll_top % line_height),
 716                );
 717                let centering_offset = vec2f(
 718                    (layout.gutter_padding + layout.gutter_margin - indicator.size().x()) / 2.,
 719                    (line_height - indicator.size().y()) / 2.,
 720                );
 721
 722                let indicator_origin = bounds.origin() + position + centering_offset;
 723
 724                indicator.paint(scene, indicator_origin, visible_bounds, editor, cx);
 725            }
 726        }
 727
 728        if let Some((row, indicator)) = layout.code_actions_indicator.as_mut() {
 729            let mut x = 0.;
 730            let mut y = *row as f32 * line_height - scroll_top;
 731            x += ((layout.gutter_padding + layout.gutter_margin) - indicator.size().x()) / 2.;
 732            y += (line_height - indicator.size().y()) / 2.;
 733            indicator.paint(
 734                scene,
 735                bounds.origin() + vec2f(x, y),
 736                visible_bounds,
 737                editor,
 738                cx,
 739            );
 740        }
 741    }
 742
 743    fn paint_diff_hunks(
 744        scene: &mut SceneBuilder,
 745        bounds: RectF,
 746        layout: &mut LayoutState,
 747        cx: &mut ViewContext<Editor>,
 748    ) {
 749        let diff_style = &theme::current(cx).editor.diff.clone();
 750        let line_height = layout.position_map.line_height;
 751
 752        let scroll_position = layout.position_map.snapshot.scroll_position();
 753        let scroll_top = scroll_position.y() * line_height;
 754
 755        for hunk in &layout.display_hunks {
 756            let (display_row_range, status) = match hunk {
 757                //TODO: This rendering is entirely a horrible hack
 758                &DisplayDiffHunk::Folded { display_row: row } => {
 759                    let start_y = row as f32 * line_height - scroll_top;
 760                    let end_y = start_y + line_height;
 761
 762                    let width = diff_style.removed_width_em * line_height;
 763                    let highlight_origin = bounds.origin() + vec2f(-width, start_y);
 764                    let highlight_size = vec2f(width * 2., end_y - start_y);
 765                    let highlight_bounds = RectF::new(highlight_origin, highlight_size);
 766
 767                    scene.push_quad(Quad {
 768                        bounds: highlight_bounds,
 769                        background: Some(diff_style.modified),
 770                        border: Border::new(0., Color::transparent_black()),
 771                        corner_radii: (1. * line_height).into(),
 772                    });
 773
 774                    continue;
 775                }
 776
 777                DisplayDiffHunk::Unfolded {
 778                    display_row_range,
 779                    status,
 780                } => (display_row_range, status),
 781            };
 782
 783            let color = match status {
 784                DiffHunkStatus::Added => diff_style.inserted,
 785                DiffHunkStatus::Modified => diff_style.modified,
 786
 787                //TODO: This rendering is entirely a horrible hack
 788                DiffHunkStatus::Removed => {
 789                    let row = display_row_range.start;
 790
 791                    let offset = line_height / 2.;
 792                    let start_y = row as f32 * line_height - offset - scroll_top;
 793                    let end_y = start_y + line_height;
 794
 795                    let width = diff_style.removed_width_em * line_height;
 796                    let highlight_origin = bounds.origin() + vec2f(-width, start_y);
 797                    let highlight_size = vec2f(width * 2., end_y - start_y);
 798                    let highlight_bounds = RectF::new(highlight_origin, highlight_size);
 799
 800                    scene.push_quad(Quad {
 801                        bounds: highlight_bounds,
 802                        background: Some(diff_style.deleted),
 803                        border: Border::new(0., Color::transparent_black()),
 804                        corner_radii: (1. * line_height).into(),
 805                    });
 806
 807                    continue;
 808                }
 809            };
 810
 811            let start_row = display_row_range.start;
 812            let end_row = display_row_range.end;
 813
 814            let start_y = start_row as f32 * line_height - scroll_top;
 815            let end_y = end_row as f32 * line_height - scroll_top;
 816
 817            let width = diff_style.width_em * line_height;
 818            let highlight_origin = bounds.origin() + vec2f(-width, start_y);
 819            let highlight_size = vec2f(width * 2., end_y - start_y);
 820            let highlight_bounds = RectF::new(highlight_origin, highlight_size);
 821
 822            scene.push_quad(Quad {
 823                bounds: highlight_bounds,
 824                background: Some(color),
 825                border: Border::new(0., Color::transparent_black()),
 826                corner_radii: (diff_style.corner_radius * line_height).into(),
 827            });
 828        }
 829    }
 830
 831    fn paint_text(
 832        &mut self,
 833        scene: &mut SceneBuilder,
 834        bounds: RectF,
 835        visible_bounds: RectF,
 836        layout: &mut LayoutState,
 837        editor: &mut Editor,
 838        cx: &mut PaintContext<Editor>,
 839    ) {
 840        let style = &self.style;
 841        let scroll_position = layout.position_map.snapshot.scroll_position();
 842        let start_row = layout.visible_display_row_range.start;
 843        let scroll_top = scroll_position.y() * layout.position_map.line_height;
 844        let max_glyph_width = layout.position_map.em_width;
 845        let scroll_left = scroll_position.x() * max_glyph_width;
 846        let content_origin = bounds.origin() + vec2f(layout.gutter_margin, 0.);
 847        let line_end_overshoot = 0.15 * layout.position_map.line_height;
 848        let whitespace_setting = editor.buffer.read(cx).settings_at(0, cx).show_whitespaces;
 849
 850        scene.push_layer(Some(bounds));
 851
 852        scene.push_cursor_region(CursorRegion {
 853            bounds,
 854            style: if !editor.link_go_to_definition_state.definitions.is_empty() {
 855                CursorStyle::PointingHand
 856            } else {
 857                CursorStyle::IBeam
 858            },
 859        });
 860
 861        let fold_corner_radius =
 862            self.style.folds.ellipses.corner_radius_factor * layout.position_map.line_height;
 863        for (id, range, color) in layout.fold_ranges.iter() {
 864            self.paint_highlighted_range(
 865                scene,
 866                range.clone(),
 867                *color,
 868                fold_corner_radius,
 869                fold_corner_radius * 2.,
 870                layout,
 871                content_origin,
 872                scroll_top,
 873                scroll_left,
 874                bounds,
 875            );
 876
 877            for bound in range_to_bounds(
 878                &range,
 879                content_origin,
 880                scroll_left,
 881                scroll_top,
 882                &layout.visible_display_row_range,
 883                line_end_overshoot,
 884                &layout.position_map,
 885            ) {
 886                scene.push_cursor_region(CursorRegion {
 887                    bounds: bound,
 888                    style: CursorStyle::PointingHand,
 889                });
 890
 891                let display_row = range.start.row();
 892
 893                let buffer_row = DisplayPoint::new(display_row, 0)
 894                    .to_point(&layout.position_map.snapshot.display_snapshot)
 895                    .row;
 896
 897                scene.push_mouse_region(
 898                    MouseRegion::new::<FoldMarkers>(cx.view_id(), *id as usize, bound)
 899                        .on_click(MouseButton::Left, move |_, editor: &mut Editor, cx| {
 900                            editor.unfold_at(&UnfoldAt { buffer_row }, cx)
 901                        })
 902                        .with_notify_on_hover(true)
 903                        .with_notify_on_click(true),
 904                )
 905            }
 906        }
 907
 908        for (range, color) in &layout.highlighted_ranges {
 909            self.paint_highlighted_range(
 910                scene,
 911                range.clone(),
 912                *color,
 913                0.,
 914                line_end_overshoot,
 915                layout,
 916                content_origin,
 917                scroll_top,
 918                scroll_left,
 919                bounds,
 920            );
 921        }
 922
 923        let mut cursors = SmallVec::<[Cursor; 32]>::new();
 924        let corner_radius = 0.15 * layout.position_map.line_height;
 925        let mut invisible_display_ranges = SmallVec::<[Range<DisplayPoint>; 32]>::new();
 926
 927        for (replica_id, selections) in &layout.selections {
 928            let replica_id = *replica_id;
 929            let selection_style = if let Some(replica_id) = replica_id {
 930                style.replica_selection_style(replica_id)
 931            } else {
 932                &style.absent_selection
 933            };
 934
 935            for selection in selections {
 936                self.paint_highlighted_range(
 937                    scene,
 938                    selection.range.clone(),
 939                    selection_style.selection,
 940                    corner_radius,
 941                    corner_radius * 2.,
 942                    layout,
 943                    content_origin,
 944                    scroll_top,
 945                    scroll_left,
 946                    bounds,
 947                );
 948
 949                if selection.is_local && !selection.range.is_empty() {
 950                    invisible_display_ranges.push(selection.range.clone());
 951                }
 952                if !selection.is_local || editor.show_local_cursors(cx) {
 953                    let cursor_position = selection.head;
 954                    if layout
 955                        .visible_display_row_range
 956                        .contains(&cursor_position.row())
 957                    {
 958                        let cursor_row_layout = &layout.position_map.line_layouts
 959                            [(cursor_position.row() - start_row) as usize]
 960                            .line;
 961                        let cursor_column = cursor_position.column() as usize;
 962
 963                        let cursor_character_x = cursor_row_layout.x_for_index(cursor_column);
 964                        let mut block_width =
 965                            cursor_row_layout.x_for_index(cursor_column + 1) - cursor_character_x;
 966                        if block_width == 0.0 {
 967                            block_width = layout.position_map.em_width;
 968                        }
 969                        let block_text = if let CursorShape::Block = selection.cursor_shape {
 970                            layout
 971                                .position_map
 972                                .snapshot
 973                                .chars_at(cursor_position)
 974                                .next()
 975                                .and_then(|(character, _)| {
 976                                    let font_id =
 977                                        cursor_row_layout.font_for_index(cursor_column)?;
 978                                    let text = character.to_string();
 979
 980                                    Some(cx.text_layout_cache().layout_str(
 981                                        &text,
 982                                        cursor_row_layout.font_size(),
 983                                        &[(
 984                                            text.chars().count(),
 985                                            RunStyle {
 986                                                font_id,
 987                                                color: style.background,
 988                                                underline: Default::default(),
 989                                            },
 990                                        )],
 991                                    ))
 992                                })
 993                        } else {
 994                            None
 995                        };
 996
 997                        let x = cursor_character_x - scroll_left;
 998                        let y = cursor_position.row() as f32 * layout.position_map.line_height
 999                            - scroll_top;
1000                        if selection.is_newest {
1001                            editor.pixel_position_of_newest_cursor = Some(vec2f(
1002                                bounds.origin_x() + x + block_width / 2.,
1003                                bounds.origin_y() + y + layout.position_map.line_height / 2.,
1004                            ));
1005                        }
1006                        cursors.push(Cursor {
1007                            color: selection_style.cursor,
1008                            block_width,
1009                            origin: vec2f(x, y),
1010                            line_height: layout.position_map.line_height,
1011                            shape: selection.cursor_shape,
1012                            block_text,
1013                        });
1014                    }
1015                }
1016            }
1017        }
1018
1019        if let Some(visible_text_bounds) = bounds.intersection(visible_bounds) {
1020            for (ix, line_with_invisibles) in layout.position_map.line_layouts.iter().enumerate() {
1021                let row = start_row + ix as u32;
1022                line_with_invisibles.draw(
1023                    layout,
1024                    row,
1025                    scroll_top,
1026                    scene,
1027                    content_origin,
1028                    scroll_left,
1029                    visible_text_bounds,
1030                    whitespace_setting,
1031                    &invisible_display_ranges,
1032                    visible_bounds,
1033                    cx,
1034                )
1035            }
1036        }
1037
1038        scene.paint_layer(Some(bounds), |scene| {
1039            for cursor in cursors {
1040                cursor.paint(scene, content_origin, cx);
1041            }
1042        });
1043
1044        if let Some((position, context_menu)) = layout.context_menu.as_mut() {
1045            scene.push_stacking_context(None, None);
1046            let cursor_row_layout =
1047                &layout.position_map.line_layouts[(position.row() - start_row) as usize].line;
1048            let x = cursor_row_layout.x_for_index(position.column() as usize) - scroll_left;
1049            let y = (position.row() + 1) as f32 * layout.position_map.line_height - scroll_top;
1050            let mut list_origin = content_origin + vec2f(x, y);
1051            let list_width = context_menu.size().x();
1052            let list_height = context_menu.size().y();
1053
1054            // Snap the right edge of the list to the right edge of the window if
1055            // its horizontal bounds overflow.
1056            if list_origin.x() + list_width > cx.window_size().x() {
1057                list_origin.set_x((cx.window_size().x() - list_width).max(0.));
1058            }
1059
1060            if list_origin.y() + list_height > bounds.max_y() {
1061                list_origin.set_y(list_origin.y() - layout.position_map.line_height - list_height);
1062            }
1063
1064            context_menu.paint(
1065                scene,
1066                list_origin,
1067                RectF::from_points(Vector2F::zero(), vec2f(f32::MAX, f32::MAX)), // Let content bleed outside of editor
1068                editor,
1069                cx,
1070            );
1071
1072            scene.pop_stacking_context();
1073        }
1074
1075        if let Some((position, hover_popovers)) = layout.hover_popovers.as_mut() {
1076            scene.push_stacking_context(None, None);
1077
1078            // This is safe because we check on layout whether the required row is available
1079            let hovered_row_layout =
1080                &layout.position_map.line_layouts[(position.row() - start_row) as usize].line;
1081
1082            // Minimum required size: Take the first popover, and add 1.5 times the minimum popover
1083            // height. This is the size we will use to decide whether to render popovers above or below
1084            // the hovered line.
1085            let first_size = hover_popovers[0].size();
1086            let height_to_reserve = first_size.y()
1087                + 1.5 * MIN_POPOVER_LINE_HEIGHT as f32 * layout.position_map.line_height;
1088
1089            // Compute Hovered Point
1090            let x = hovered_row_layout.x_for_index(position.column() as usize) - scroll_left;
1091            let y = position.row() as f32 * layout.position_map.line_height - scroll_top;
1092            let hovered_point = content_origin + vec2f(x, y);
1093
1094            if hovered_point.y() - height_to_reserve > 0.0 {
1095                // There is enough space above. Render popovers above the hovered point
1096                let mut current_y = hovered_point.y();
1097                for hover_popover in hover_popovers {
1098                    let size = hover_popover.size();
1099                    let mut popover_origin = vec2f(hovered_point.x(), current_y - size.y());
1100
1101                    let x_out_of_bounds = bounds.max_x() - (popover_origin.x() + size.x());
1102                    if x_out_of_bounds < 0.0 {
1103                        popover_origin.set_x(popover_origin.x() + x_out_of_bounds);
1104                    }
1105
1106                    hover_popover.paint(
1107                        scene,
1108                        popover_origin,
1109                        RectF::from_points(Vector2F::zero(), vec2f(f32::MAX, f32::MAX)), // Let content bleed outside of editor
1110                        editor,
1111                        cx,
1112                    );
1113
1114                    current_y = popover_origin.y() - HOVER_POPOVER_GAP;
1115                }
1116            } else {
1117                // There is not enough space above. Render popovers below the hovered point
1118                let mut current_y = hovered_point.y() + layout.position_map.line_height;
1119                for hover_popover in hover_popovers {
1120                    let size = hover_popover.size();
1121                    let mut popover_origin = vec2f(hovered_point.x(), current_y);
1122
1123                    let x_out_of_bounds = bounds.max_x() - (popover_origin.x() + size.x());
1124                    if x_out_of_bounds < 0.0 {
1125                        popover_origin.set_x(popover_origin.x() + x_out_of_bounds);
1126                    }
1127
1128                    hover_popover.paint(
1129                        scene,
1130                        popover_origin,
1131                        RectF::from_points(Vector2F::zero(), vec2f(f32::MAX, f32::MAX)), // Let content bleed outside of editor
1132                        editor,
1133                        cx,
1134                    );
1135
1136                    current_y = popover_origin.y() + size.y() + HOVER_POPOVER_GAP;
1137                }
1138            }
1139
1140            scene.pop_stacking_context();
1141        }
1142
1143        scene.pop_layer();
1144    }
1145
1146    fn scrollbar_left(&self, bounds: &RectF) -> f32 {
1147        bounds.max_x() - self.style.theme.scrollbar.width
1148    }
1149
1150    fn paint_scrollbar(
1151        &mut self,
1152        scene: &mut SceneBuilder,
1153        bounds: RectF,
1154        layout: &mut LayoutState,
1155        cx: &mut ViewContext<Editor>,
1156        editor: &Editor,
1157    ) {
1158        enum ScrollbarMouseHandlers {}
1159        if layout.mode != EditorMode::Full {
1160            return;
1161        }
1162
1163        let style = &self.style.theme.scrollbar;
1164
1165        let top = bounds.min_y();
1166        let bottom = bounds.max_y();
1167        let right = bounds.max_x();
1168        let left = self.scrollbar_left(&bounds);
1169        let row_range = &layout.scrollbar_row_range;
1170        let max_row = layout.max_row as f32 + (row_range.end - row_range.start);
1171
1172        let mut height = bounds.height();
1173        let mut first_row_y_offset = 0.0;
1174
1175        // Impose a minimum height on the scrollbar thumb
1176        let row_height = height / max_row;
1177        let min_thumb_height =
1178            style.min_height_factor * cx.font_cache.line_height(self.style.text.font_size);
1179        let thumb_height = (row_range.end - row_range.start) * row_height;
1180        if thumb_height < min_thumb_height {
1181            first_row_y_offset = (min_thumb_height - thumb_height) / 2.0;
1182            height -= min_thumb_height - thumb_height;
1183        }
1184
1185        let y_for_row = |row: f32| -> f32 { top + first_row_y_offset + row * row_height };
1186
1187        let thumb_top = y_for_row(row_range.start) - first_row_y_offset;
1188        let thumb_bottom = y_for_row(row_range.end) + first_row_y_offset;
1189        let track_bounds = RectF::from_points(vec2f(left, top), vec2f(right, bottom));
1190        let thumb_bounds = RectF::from_points(vec2f(left, thumb_top), vec2f(right, thumb_bottom));
1191
1192        if layout.show_scrollbars {
1193            scene.push_quad(Quad {
1194                bounds: track_bounds,
1195                border: style.track.border,
1196                background: style.track.background_color,
1197                ..Default::default()
1198            });
1199            let scrollbar_settings = settings::get::<EditorSettings>(cx).scrollbar;
1200            let theme = theme::current(cx);
1201            let scrollbar_theme = &theme.editor.scrollbar;
1202            if layout.is_singleton && scrollbar_settings.selections {
1203                let start_anchor = Anchor::min();
1204                let end_anchor = Anchor::max();
1205                let color = scrollbar_theme.selections;
1206                let border = Border {
1207                    width: 1.,
1208                    color: style.thumb.border.color,
1209                    overlay: false,
1210                    top: false,
1211                    right: true,
1212                    bottom: false,
1213                    left: true,
1214                };
1215                let mut push_region = |start: DisplayPoint, end: DisplayPoint| {
1216                    let start_y = y_for_row(start.row() as f32);
1217                    let mut end_y = y_for_row(end.row() as f32);
1218                    if end_y - start_y < 1. {
1219                        end_y = start_y + 1.;
1220                    }
1221                    let bounds = RectF::from_points(vec2f(left, start_y), vec2f(right, end_y));
1222
1223                    scene.push_quad(Quad {
1224                        bounds,
1225                        background: Some(color),
1226                        border,
1227                        corner_radii: style.thumb.corner_radii.into(),
1228                    })
1229                };
1230                let background_ranges = editor
1231                    .background_highlight_row_ranges::<crate::items::BufferSearchHighlights>(
1232                        start_anchor..end_anchor,
1233                        &layout.position_map.snapshot,
1234                        50000,
1235                    );
1236                for row in background_ranges {
1237                    let start = row.start();
1238                    let end = row.end();
1239                    push_region(*start, *end);
1240                }
1241            }
1242
1243            if layout.is_singleton && scrollbar_settings.git_diff {
1244                let diff_style = scrollbar_theme.git.clone();
1245                for hunk in layout
1246                    .position_map
1247                    .snapshot
1248                    .buffer_snapshot
1249                    .git_diff_hunks_in_range(0..(max_row.floor() as u32))
1250                {
1251                    let start_display = Point::new(hunk.buffer_range.start, 0)
1252                        .to_display_point(&layout.position_map.snapshot.display_snapshot);
1253                    let end_display = Point::new(hunk.buffer_range.end, 0)
1254                        .to_display_point(&layout.position_map.snapshot.display_snapshot);
1255                    let start_y = y_for_row(start_display.row() as f32);
1256                    let mut end_y = if hunk.buffer_range.start == hunk.buffer_range.end {
1257                        y_for_row((end_display.row() + 1) as f32)
1258                    } else {
1259                        y_for_row((end_display.row()) as f32)
1260                    };
1261
1262                    if end_y - start_y < 1. {
1263                        end_y = start_y + 1.;
1264                    }
1265                    let bounds = RectF::from_points(vec2f(left, start_y), vec2f(right, end_y));
1266
1267                    let color = match hunk.status() {
1268                        DiffHunkStatus::Added => diff_style.inserted,
1269                        DiffHunkStatus::Modified => diff_style.modified,
1270                        DiffHunkStatus::Removed => diff_style.deleted,
1271                    };
1272
1273                    let border = Border {
1274                        width: 1.,
1275                        color: style.thumb.border.color,
1276                        overlay: false,
1277                        top: false,
1278                        right: true,
1279                        bottom: false,
1280                        left: true,
1281                    };
1282
1283                    scene.push_quad(Quad {
1284                        bounds,
1285                        background: Some(color),
1286                        border,
1287                        corner_radii: style.thumb.corner_radii.into(),
1288                    })
1289                }
1290            }
1291
1292            scene.push_quad(Quad {
1293                bounds: thumb_bounds,
1294                border: style.thumb.border,
1295                background: style.thumb.background_color,
1296                corner_radii: style.thumb.corner_radii.into(),
1297            });
1298        }
1299
1300        scene.push_cursor_region(CursorRegion {
1301            bounds: track_bounds,
1302            style: CursorStyle::Arrow,
1303        });
1304        scene.push_mouse_region(
1305            MouseRegion::new::<ScrollbarMouseHandlers>(cx.view_id(), cx.view_id(), track_bounds)
1306                .on_move(move |event, editor: &mut Editor, cx| {
1307                    if event.pressed_button.is_none() {
1308                        editor.scroll_manager.show_scrollbar(cx);
1309                    }
1310                })
1311                .on_down(MouseButton::Left, {
1312                    let row_range = row_range.clone();
1313                    move |event, editor: &mut Editor, cx| {
1314                        let y = event.position.y();
1315                        if y < thumb_top || thumb_bottom < y {
1316                            let center_row = ((y - top) * max_row as f32 / height).round() as u32;
1317                            let top_row = center_row
1318                                .saturating_sub((row_range.end - row_range.start) as u32 / 2);
1319                            let mut position = editor.scroll_position(cx);
1320                            position.set_y(top_row as f32);
1321                            editor.set_scroll_position(position, cx);
1322                        } else {
1323                            editor.scroll_manager.show_scrollbar(cx);
1324                        }
1325                    }
1326                })
1327                .on_drag(MouseButton::Left, {
1328                    move |event, editor: &mut Editor, cx| {
1329                        if event.end {
1330                            return;
1331                        }
1332
1333                        let y = event.prev_mouse_position.y();
1334                        let new_y = event.position.y();
1335                        if thumb_top < y && y < thumb_bottom {
1336                            let mut position = editor.scroll_position(cx);
1337                            position.set_y(position.y() + (new_y - y) * (max_row as f32) / height);
1338                            if position.y() < 0.0 {
1339                                position.set_y(0.);
1340                            }
1341                            editor.set_scroll_position(position, cx);
1342                        }
1343                    }
1344                }),
1345        );
1346    }
1347
1348    #[allow(clippy::too_many_arguments)]
1349    fn paint_highlighted_range(
1350        &self,
1351        scene: &mut SceneBuilder,
1352        range: Range<DisplayPoint>,
1353        color: Color,
1354        corner_radius: f32,
1355        line_end_overshoot: f32,
1356        layout: &LayoutState,
1357        content_origin: Vector2F,
1358        scroll_top: f32,
1359        scroll_left: f32,
1360        bounds: RectF,
1361    ) {
1362        let start_row = layout.visible_display_row_range.start;
1363        let end_row = layout.visible_display_row_range.end;
1364        if range.start != range.end {
1365            let row_range = if range.end.column() == 0 {
1366                cmp::max(range.start.row(), start_row)..cmp::min(range.end.row(), end_row)
1367            } else {
1368                cmp::max(range.start.row(), start_row)..cmp::min(range.end.row() + 1, end_row)
1369            };
1370
1371            let highlighted_range = HighlightedRange {
1372                color,
1373                line_height: layout.position_map.line_height,
1374                corner_radius,
1375                start_y: content_origin.y()
1376                    + row_range.start as f32 * layout.position_map.line_height
1377                    - scroll_top,
1378                lines: row_range
1379                    .into_iter()
1380                    .map(|row| {
1381                        let line_layout =
1382                            &layout.position_map.line_layouts[(row - start_row) as usize].line;
1383                        HighlightedRangeLine {
1384                            start_x: if row == range.start.row() {
1385                                content_origin.x()
1386                                    + line_layout.x_for_index(range.start.column() as usize)
1387                                    - scroll_left
1388                            } else {
1389                                content_origin.x() - scroll_left
1390                            },
1391                            end_x: if row == range.end.row() {
1392                                content_origin.x()
1393                                    + line_layout.x_for_index(range.end.column() as usize)
1394                                    - scroll_left
1395                            } else {
1396                                content_origin.x() + line_layout.width() + line_end_overshoot
1397                                    - scroll_left
1398                            },
1399                        }
1400                    })
1401                    .collect(),
1402            };
1403
1404            highlighted_range.paint(bounds, scene);
1405        }
1406    }
1407
1408    fn paint_blocks(
1409        &mut self,
1410        scene: &mut SceneBuilder,
1411        bounds: RectF,
1412        visible_bounds: RectF,
1413        layout: &mut LayoutState,
1414        editor: &mut Editor,
1415        cx: &mut PaintContext<Editor>,
1416    ) {
1417        let scroll_position = layout.position_map.snapshot.scroll_position();
1418        let scroll_left = scroll_position.x() * layout.position_map.em_width;
1419        let scroll_top = scroll_position.y() * layout.position_map.line_height;
1420
1421        for block in &mut layout.blocks {
1422            let mut origin = bounds.origin()
1423                + vec2f(
1424                    0.,
1425                    block.row as f32 * layout.position_map.line_height - scroll_top,
1426                );
1427            if !matches!(block.style, BlockStyle::Sticky) {
1428                origin += vec2f(-scroll_left, 0.);
1429            }
1430            block
1431                .element
1432                .paint(scene, origin, visible_bounds, editor, cx);
1433        }
1434    }
1435
1436    fn column_pixels(&self, column: usize, cx: &ViewContext<Editor>) -> f32 {
1437        let style = &self.style;
1438
1439        cx.text_layout_cache()
1440            .layout_str(
1441                " ".repeat(column).as_str(),
1442                style.text.font_size,
1443                &[(
1444                    column,
1445                    RunStyle {
1446                        font_id: style.text.font_id,
1447                        color: Color::black(),
1448                        underline: Default::default(),
1449                    },
1450                )],
1451            )
1452            .width()
1453    }
1454
1455    fn max_line_number_width(&self, snapshot: &EditorSnapshot, cx: &ViewContext<Editor>) -> f32 {
1456        let digit_count = (snapshot.max_buffer_row() as f32 + 1.).log10().floor() as usize + 1;
1457        self.column_pixels(digit_count, cx)
1458    }
1459
1460    //Folds contained in a hunk are ignored apart from shrinking visual size
1461    //If a fold contains any hunks then that fold line is marked as modified
1462    fn layout_git_gutters(
1463        &self,
1464        display_rows: Range<u32>,
1465        snapshot: &EditorSnapshot,
1466    ) -> Vec<DisplayDiffHunk> {
1467        let buffer_snapshot = &snapshot.buffer_snapshot;
1468
1469        let buffer_start_row = DisplayPoint::new(display_rows.start, 0)
1470            .to_point(snapshot)
1471            .row;
1472        let buffer_end_row = DisplayPoint::new(display_rows.end, 0)
1473            .to_point(snapshot)
1474            .row;
1475
1476        buffer_snapshot
1477            .git_diff_hunks_in_range(buffer_start_row..buffer_end_row)
1478            .map(|hunk| diff_hunk_to_display(hunk, snapshot))
1479            .dedup()
1480            .collect()
1481    }
1482
1483    fn layout_line_numbers(
1484        &self,
1485        rows: Range<u32>,
1486        active_rows: &BTreeMap<u32, bool>,
1487        is_singleton: bool,
1488        snapshot: &EditorSnapshot,
1489        cx: &ViewContext<Editor>,
1490    ) -> (
1491        Vec<Option<text_layout::Line>>,
1492        Vec<Option<(FoldStatus, BufferRow, bool)>>,
1493    ) {
1494        let style = &self.style;
1495        let include_line_numbers = snapshot.mode == EditorMode::Full;
1496        let mut line_number_layouts = Vec::with_capacity(rows.len());
1497        let mut fold_statuses = Vec::with_capacity(rows.len());
1498        let mut line_number = String::new();
1499        for (ix, row) in snapshot
1500            .buffer_rows(rows.start)
1501            .take((rows.end - rows.start) as usize)
1502            .enumerate()
1503        {
1504            let display_row = rows.start + ix as u32;
1505            let (active, color) = if active_rows.contains_key(&display_row) {
1506                (true, style.line_number_active)
1507            } else {
1508                (false, style.line_number)
1509            };
1510            if let Some(buffer_row) = row {
1511                if include_line_numbers {
1512                    line_number.clear();
1513                    write!(&mut line_number, "{}", buffer_row + 1).unwrap();
1514                    line_number_layouts.push(Some(cx.text_layout_cache().layout_str(
1515                        &line_number,
1516                        style.text.font_size,
1517                        &[(
1518                            line_number.len(),
1519                            RunStyle {
1520                                font_id: style.text.font_id,
1521                                color,
1522                                underline: Default::default(),
1523                            },
1524                        )],
1525                    )));
1526                    fold_statuses.push(
1527                        is_singleton
1528                            .then(|| {
1529                                snapshot
1530                                    .fold_for_line(buffer_row)
1531                                    .map(|fold_status| (fold_status, buffer_row, active))
1532                            })
1533                            .flatten(),
1534                    )
1535                }
1536            } else {
1537                fold_statuses.push(None);
1538                line_number_layouts.push(None);
1539            }
1540        }
1541
1542        (line_number_layouts, fold_statuses)
1543    }
1544
1545    fn layout_lines(
1546        &mut self,
1547        rows: Range<u32>,
1548        line_number_layouts: &[Option<Line>],
1549        snapshot: &EditorSnapshot,
1550        cx: &ViewContext<Editor>,
1551    ) -> Vec<LineWithInvisibles> {
1552        if rows.start >= rows.end {
1553            return Vec::new();
1554        }
1555
1556        // When the editor is empty and unfocused, then show the placeholder.
1557        if snapshot.is_empty() {
1558            let placeholder_style = self
1559                .style
1560                .placeholder_text
1561                .as_ref()
1562                .unwrap_or(&self.style.text);
1563            let placeholder_text = snapshot.placeholder_text();
1564            let placeholder_lines = placeholder_text
1565                .as_ref()
1566                .map_or("", AsRef::as_ref)
1567                .split('\n')
1568                .skip(rows.start as usize)
1569                .chain(iter::repeat(""))
1570                .take(rows.len());
1571            placeholder_lines
1572                .map(|line| {
1573                    cx.text_layout_cache().layout_str(
1574                        line,
1575                        placeholder_style.font_size,
1576                        &[(
1577                            line.len(),
1578                            RunStyle {
1579                                font_id: placeholder_style.font_id,
1580                                color: placeholder_style.color,
1581                                underline: Default::default(),
1582                            },
1583                        )],
1584                    )
1585                })
1586                .map(|line| LineWithInvisibles {
1587                    line,
1588                    invisibles: Vec::new(),
1589                })
1590                .collect()
1591        } else {
1592            let style = &self.style;
1593            let chunks = snapshot
1594                .chunks(
1595                    rows.clone(),
1596                    true,
1597                    Some(style.theme.hint),
1598                    Some(style.theme.suggestion),
1599                )
1600                .map(|chunk| {
1601                    let mut highlight_style = chunk
1602                        .syntax_highlight_id
1603                        .and_then(|id| id.style(&style.syntax));
1604
1605                    if let Some(chunk_highlight) = chunk.highlight_style {
1606                        if let Some(highlight_style) = highlight_style.as_mut() {
1607                            highlight_style.highlight(chunk_highlight);
1608                        } else {
1609                            highlight_style = Some(chunk_highlight);
1610                        }
1611                    }
1612
1613                    let mut diagnostic_highlight = HighlightStyle::default();
1614
1615                    if chunk.is_unnecessary {
1616                        diagnostic_highlight.fade_out = Some(style.unnecessary_code_fade);
1617                    }
1618
1619                    if let Some(severity) = chunk.diagnostic_severity {
1620                        // Omit underlines for HINT/INFO diagnostics on 'unnecessary' code.
1621                        if severity <= DiagnosticSeverity::WARNING || !chunk.is_unnecessary {
1622                            let diagnostic_style = super::diagnostic_style(severity, true, style);
1623                            diagnostic_highlight.underline = Some(Underline {
1624                                color: Some(diagnostic_style.message.text.color),
1625                                thickness: 1.0.into(),
1626                                squiggly: true,
1627                            });
1628                        }
1629                    }
1630
1631                    if let Some(highlight_style) = highlight_style.as_mut() {
1632                        highlight_style.highlight(diagnostic_highlight);
1633                    } else {
1634                        highlight_style = Some(diagnostic_highlight);
1635                    }
1636
1637                    HighlightedChunk {
1638                        chunk: chunk.text,
1639                        style: highlight_style,
1640                        is_tab: chunk.is_tab,
1641                    }
1642                });
1643
1644            LineWithInvisibles::from_chunks(
1645                chunks,
1646                &style.text,
1647                cx.text_layout_cache(),
1648                cx.font_cache(),
1649                MAX_LINE_LEN,
1650                rows.len() as usize,
1651                line_number_layouts,
1652                snapshot.mode,
1653            )
1654        }
1655    }
1656
1657    #[allow(clippy::too_many_arguments)]
1658    fn layout_blocks(
1659        &mut self,
1660        rows: Range<u32>,
1661        snapshot: &EditorSnapshot,
1662        editor_width: f32,
1663        scroll_width: f32,
1664        gutter_padding: f32,
1665        gutter_width: f32,
1666        em_width: f32,
1667        text_x: f32,
1668        line_height: f32,
1669        style: &EditorStyle,
1670        line_layouts: &[LineWithInvisibles],
1671        editor: &mut Editor,
1672        cx: &mut LayoutContext<Editor>,
1673    ) -> (f32, Vec<BlockLayout>) {
1674        let mut block_id = 0;
1675        let scroll_x = snapshot.scroll_anchor.offset.x();
1676        let (fixed_blocks, non_fixed_blocks) = snapshot
1677            .blocks_in_range(rows.clone())
1678            .partition::<Vec<_>, _>(|(_, block)| match block {
1679                TransformBlock::ExcerptHeader { .. } => false,
1680                TransformBlock::Custom(block) => block.style() == BlockStyle::Fixed,
1681            });
1682        let mut render_block = |block: &TransformBlock, width: f32, block_id: usize| {
1683            let mut element = match block {
1684                TransformBlock::Custom(block) => {
1685                    let align_to = block
1686                        .position()
1687                        .to_point(&snapshot.buffer_snapshot)
1688                        .to_display_point(snapshot);
1689                    let anchor_x = text_x
1690                        + if rows.contains(&align_to.row()) {
1691                            line_layouts[(align_to.row() - rows.start) as usize]
1692                                .line
1693                                .x_for_index(align_to.column() as usize)
1694                        } else {
1695                            layout_line(align_to.row(), snapshot, style, cx.text_layout_cache())
1696                                .x_for_index(align_to.column() as usize)
1697                        };
1698
1699                    block.render(&mut BlockContext {
1700                        view_context: cx,
1701                        anchor_x,
1702                        gutter_padding,
1703                        line_height,
1704                        scroll_x,
1705                        gutter_width,
1706                        em_width,
1707                        block_id,
1708                    })
1709                }
1710                TransformBlock::ExcerptHeader {
1711                    id,
1712                    buffer,
1713                    range,
1714                    starts_new_buffer,
1715                    ..
1716                } => {
1717                    let tooltip_style = theme::current(cx).tooltip.clone();
1718                    let include_root = editor
1719                        .project
1720                        .as_ref()
1721                        .map(|project| project.read(cx).visible_worktrees(cx).count() > 1)
1722                        .unwrap_or_default();
1723                    let jump_icon = project::File::from_dyn(buffer.file()).map(|file| {
1724                        let jump_path = ProjectPath {
1725                            worktree_id: file.worktree_id(cx),
1726                            path: file.path.clone(),
1727                        };
1728                        let jump_anchor = range
1729                            .primary
1730                            .as_ref()
1731                            .map_or(range.context.start, |primary| primary.start);
1732                        let jump_position = language::ToPoint::to_point(&jump_anchor, buffer);
1733
1734                        enum JumpIcon {}
1735                        MouseEventHandler::new::<JumpIcon, _>((*id).into(), cx, |state, _| {
1736                            let style = style.jump_icon.style_for(state);
1737                            Svg::new("icons/arrow_up_right_8.svg")
1738                                .with_color(style.color)
1739                                .constrained()
1740                                .with_width(style.icon_width)
1741                                .aligned()
1742                                .contained()
1743                                .with_style(style.container)
1744                                .constrained()
1745                                .with_width(style.button_width)
1746                                .with_height(style.button_width)
1747                        })
1748                        .with_cursor_style(CursorStyle::PointingHand)
1749                        .on_click(MouseButton::Left, move |_, editor, cx| {
1750                            if let Some(workspace) = editor
1751                                .workspace
1752                                .as_ref()
1753                                .and_then(|(workspace, _)| workspace.upgrade(cx))
1754                            {
1755                                workspace.update(cx, |workspace, cx| {
1756                                    Editor::jump(
1757                                        workspace,
1758                                        jump_path.clone(),
1759                                        jump_position,
1760                                        jump_anchor,
1761                                        cx,
1762                                    );
1763                                });
1764                            }
1765                        })
1766                        .with_tooltip::<JumpIcon>(
1767                            (*id).into(),
1768                            "Jump to Buffer".to_string(),
1769                            Some(Box::new(crate::OpenExcerpts)),
1770                            tooltip_style.clone(),
1771                            cx,
1772                        )
1773                        .aligned()
1774                        .flex_float()
1775                    });
1776
1777                    if *starts_new_buffer {
1778                        let editor_font_size = style.text.font_size;
1779                        let style = &style.diagnostic_path_header;
1780                        let font_size = (style.text_scale_factor * editor_font_size).round();
1781
1782                        let path = buffer.resolve_file_path(cx, include_root);
1783                        let mut filename = None;
1784                        let mut parent_path = None;
1785                        // Can't use .and_then() because `.file_name()` and `.parent()` return references :(
1786                        if let Some(path) = path {
1787                            filename = path.file_name().map(|f| f.to_string_lossy().to_string());
1788                            parent_path =
1789                                path.parent().map(|p| p.to_string_lossy().to_string() + "/");
1790                        }
1791
1792                        Flex::row()
1793                            .with_child(
1794                                Label::new(
1795                                    filename.unwrap_or_else(|| "untitled".to_string()),
1796                                    style.filename.text.clone().with_font_size(font_size),
1797                                )
1798                                .contained()
1799                                .with_style(style.filename.container)
1800                                .aligned(),
1801                            )
1802                            .with_children(parent_path.map(|path| {
1803                                Label::new(path, style.path.text.clone().with_font_size(font_size))
1804                                    .contained()
1805                                    .with_style(style.path.container)
1806                                    .aligned()
1807                            }))
1808                            .with_children(jump_icon)
1809                            .contained()
1810                            .with_style(style.container)
1811                            .with_padding_left(gutter_padding)
1812                            .with_padding_right(gutter_padding)
1813                            .expanded()
1814                            .into_any_named("path header block")
1815                    } else {
1816                        let text_style = style.text.clone();
1817                        Flex::row()
1818                            .with_child(Label::new("⋯", text_style))
1819                            .with_children(jump_icon)
1820                            .contained()
1821                            .with_padding_left(gutter_padding)
1822                            .with_padding_right(gutter_padding)
1823                            .expanded()
1824                            .into_any_named("collapsed context")
1825                    }
1826                }
1827            };
1828
1829            element.layout(
1830                SizeConstraint {
1831                    min: Vector2F::zero(),
1832                    max: vec2f(width, block.height() as f32 * line_height),
1833                },
1834                editor,
1835                cx,
1836            );
1837            element
1838        };
1839
1840        let mut fixed_block_max_width = 0f32;
1841        let mut blocks = Vec::new();
1842        for (row, block) in fixed_blocks {
1843            let element = render_block(block, f32::INFINITY, block_id);
1844            block_id += 1;
1845            fixed_block_max_width = fixed_block_max_width.max(element.size().x() + em_width);
1846            blocks.push(BlockLayout {
1847                row,
1848                element,
1849                style: BlockStyle::Fixed,
1850            });
1851        }
1852        for (row, block) in non_fixed_blocks {
1853            let style = match block {
1854                TransformBlock::Custom(block) => block.style(),
1855                TransformBlock::ExcerptHeader { .. } => BlockStyle::Sticky,
1856            };
1857            let width = match style {
1858                BlockStyle::Sticky => editor_width,
1859                BlockStyle::Flex => editor_width
1860                    .max(fixed_block_max_width)
1861                    .max(gutter_width + scroll_width),
1862                BlockStyle::Fixed => unreachable!(),
1863            };
1864            let element = render_block(block, width, block_id);
1865            block_id += 1;
1866            blocks.push(BlockLayout {
1867                row,
1868                element,
1869                style,
1870            });
1871        }
1872        (
1873            scroll_width.max(fixed_block_max_width - gutter_width),
1874            blocks,
1875        )
1876    }
1877}
1878
1879fn find_hovered_hint_part<'a>(
1880    label_parts: &'a [InlayHintLabelPart],
1881    hint_range: Range<InlayOffset>,
1882    hovered_offset: InlayOffset,
1883) -> Option<&'a InlayHintLabelPart> {
1884    if hovered_offset >= hint_range.start && hovered_offset <= hint_range.end {
1885        let mut hovered_character = (hovered_offset - hint_range.start).0;
1886        for part in label_parts {
1887            let part_len = part.value.chars().count();
1888            if hovered_character >= part_len {
1889                hovered_character -= part_len;
1890            } else {
1891                return Some(part);
1892            }
1893        }
1894    }
1895    None
1896}
1897
1898struct HighlightedChunk<'a> {
1899    chunk: &'a str,
1900    style: Option<HighlightStyle>,
1901    is_tab: bool,
1902}
1903
1904#[derive(Debug)]
1905pub struct LineWithInvisibles {
1906    pub line: Line,
1907    invisibles: Vec<Invisible>,
1908}
1909
1910impl LineWithInvisibles {
1911    fn from_chunks<'a>(
1912        chunks: impl Iterator<Item = HighlightedChunk<'a>>,
1913        text_style: &TextStyle,
1914        text_layout_cache: &TextLayoutCache,
1915        font_cache: &Arc<FontCache>,
1916        max_line_len: usize,
1917        max_line_count: usize,
1918        line_number_layouts: &[Option<Line>],
1919        editor_mode: EditorMode,
1920    ) -> Vec<Self> {
1921        let mut layouts = Vec::with_capacity(max_line_count);
1922        let mut line = String::new();
1923        let mut invisibles = Vec::new();
1924        let mut styles = Vec::new();
1925        let mut non_whitespace_added = false;
1926        let mut row = 0;
1927        let mut line_exceeded_max_len = false;
1928        for highlighted_chunk in chunks.chain([HighlightedChunk {
1929            chunk: "\n",
1930            style: None,
1931            is_tab: false,
1932        }]) {
1933            for (ix, mut line_chunk) in highlighted_chunk.chunk.split('\n').enumerate() {
1934                if ix > 0 {
1935                    layouts.push(Self {
1936                        line: text_layout_cache.layout_str(&line, text_style.font_size, &styles),
1937                        invisibles: invisibles.drain(..).collect(),
1938                    });
1939
1940                    line.clear();
1941                    styles.clear();
1942                    row += 1;
1943                    line_exceeded_max_len = false;
1944                    non_whitespace_added = false;
1945                    if row == max_line_count {
1946                        return layouts;
1947                    }
1948                }
1949
1950                if !line_chunk.is_empty() && !line_exceeded_max_len {
1951                    let text_style = if let Some(style) = highlighted_chunk.style {
1952                        text_style
1953                            .clone()
1954                            .highlight(style, font_cache)
1955                            .map(Cow::Owned)
1956                            .unwrap_or_else(|_| Cow::Borrowed(text_style))
1957                    } else {
1958                        Cow::Borrowed(text_style)
1959                    };
1960
1961                    if line.len() + line_chunk.len() > max_line_len {
1962                        let mut chunk_len = max_line_len - line.len();
1963                        while !line_chunk.is_char_boundary(chunk_len) {
1964                            chunk_len -= 1;
1965                        }
1966                        line_chunk = &line_chunk[..chunk_len];
1967                        line_exceeded_max_len = true;
1968                    }
1969
1970                    styles.push((
1971                        line_chunk.len(),
1972                        RunStyle {
1973                            font_id: text_style.font_id,
1974                            color: text_style.color,
1975                            underline: text_style.underline,
1976                        },
1977                    ));
1978
1979                    if editor_mode == EditorMode::Full {
1980                        // Line wrap pads its contents with fake whitespaces,
1981                        // avoid printing them
1982                        let inside_wrapped_string = line_number_layouts
1983                            .get(row)
1984                            .and_then(|layout| layout.as_ref())
1985                            .is_none();
1986                        if highlighted_chunk.is_tab {
1987                            if non_whitespace_added || !inside_wrapped_string {
1988                                invisibles.push(Invisible::Tab {
1989                                    line_start_offset: line.len(),
1990                                });
1991                            }
1992                        } else {
1993                            invisibles.extend(
1994                                line_chunk
1995                                    .chars()
1996                                    .enumerate()
1997                                    .filter(|(_, line_char)| {
1998                                        let is_whitespace = line_char.is_whitespace();
1999                                        non_whitespace_added |= !is_whitespace;
2000                                        is_whitespace
2001                                            && (non_whitespace_added || !inside_wrapped_string)
2002                                    })
2003                                    .map(|(whitespace_index, _)| Invisible::Whitespace {
2004                                        line_offset: line.len() + whitespace_index,
2005                                    }),
2006                            )
2007                        }
2008                    }
2009
2010                    line.push_str(line_chunk);
2011                }
2012            }
2013        }
2014
2015        layouts
2016    }
2017
2018    fn draw(
2019        &self,
2020        layout: &LayoutState,
2021        row: u32,
2022        scroll_top: f32,
2023        scene: &mut SceneBuilder,
2024        content_origin: Vector2F,
2025        scroll_left: f32,
2026        visible_text_bounds: RectF,
2027        whitespace_setting: ShowWhitespaceSetting,
2028        selection_ranges: &[Range<DisplayPoint>],
2029        visible_bounds: RectF,
2030        cx: &mut ViewContext<Editor>,
2031    ) {
2032        let line_height = layout.position_map.line_height;
2033        let line_y = row as f32 * line_height - scroll_top;
2034
2035        self.line.paint(
2036            scene,
2037            content_origin + vec2f(-scroll_left, line_y),
2038            visible_text_bounds,
2039            line_height,
2040            cx,
2041        );
2042
2043        self.draw_invisibles(
2044            &selection_ranges,
2045            layout,
2046            content_origin,
2047            scroll_left,
2048            line_y,
2049            row,
2050            scene,
2051            visible_bounds,
2052            line_height,
2053            whitespace_setting,
2054            cx,
2055        );
2056    }
2057
2058    fn draw_invisibles(
2059        &self,
2060        selection_ranges: &[Range<DisplayPoint>],
2061        layout: &LayoutState,
2062        content_origin: Vector2F,
2063        scroll_left: f32,
2064        line_y: f32,
2065        row: u32,
2066        scene: &mut SceneBuilder,
2067        visible_bounds: RectF,
2068        line_height: f32,
2069        whitespace_setting: ShowWhitespaceSetting,
2070        cx: &mut ViewContext<Editor>,
2071    ) {
2072        let allowed_invisibles_regions = match whitespace_setting {
2073            ShowWhitespaceSetting::None => return,
2074            ShowWhitespaceSetting::Selection => Some(selection_ranges),
2075            ShowWhitespaceSetting::All => None,
2076        };
2077
2078        for invisible in &self.invisibles {
2079            let (&token_offset, invisible_symbol) = match invisible {
2080                Invisible::Tab { line_start_offset } => (line_start_offset, &layout.tab_invisible),
2081                Invisible::Whitespace { line_offset } => (line_offset, &layout.space_invisible),
2082            };
2083
2084            let x_offset = self.line.x_for_index(token_offset);
2085            let invisible_offset =
2086                (layout.position_map.em_width - invisible_symbol.width()).max(0.0) / 2.0;
2087            let origin = content_origin + vec2f(-scroll_left + x_offset + invisible_offset, line_y);
2088
2089            if let Some(allowed_regions) = allowed_invisibles_regions {
2090                let invisible_point = DisplayPoint::new(row, token_offset as u32);
2091                if !allowed_regions
2092                    .iter()
2093                    .any(|region| region.start <= invisible_point && invisible_point < region.end)
2094                {
2095                    continue;
2096                }
2097            }
2098            invisible_symbol.paint(scene, origin, visible_bounds, line_height, cx);
2099        }
2100    }
2101}
2102
2103#[derive(Debug, Clone, Copy, PartialEq, Eq)]
2104enum Invisible {
2105    Tab { line_start_offset: usize },
2106    Whitespace { line_offset: usize },
2107}
2108
2109impl Element<Editor> for EditorElement {
2110    type LayoutState = LayoutState;
2111    type PaintState = ();
2112
2113    fn layout(
2114        &mut self,
2115        constraint: SizeConstraint,
2116        editor: &mut Editor,
2117        cx: &mut LayoutContext<Editor>,
2118    ) -> (Vector2F, Self::LayoutState) {
2119        let mut size = constraint.max;
2120        if size.x().is_infinite() {
2121            unimplemented!("we don't yet handle an infinite width constraint on buffer elements");
2122        }
2123
2124        let snapshot = editor.snapshot(cx);
2125        let style = self.style.clone();
2126
2127        let line_height = (style.text.font_size * style.line_height_scalar).round();
2128
2129        let gutter_padding;
2130        let gutter_width;
2131        let gutter_margin;
2132        if snapshot.show_gutter {
2133            let em_width = style.text.em_width(cx.font_cache());
2134            gutter_padding = (em_width * style.gutter_padding_factor).round();
2135            gutter_width = self.max_line_number_width(&snapshot, cx) + gutter_padding * 2.0;
2136            gutter_margin = -style.text.descent(cx.font_cache());
2137        } else {
2138            gutter_padding = 0.0;
2139            gutter_width = 0.0;
2140            gutter_margin = 0.0;
2141        };
2142
2143        let text_width = size.x() - gutter_width;
2144        let em_width = style.text.em_width(cx.font_cache());
2145        let em_advance = style.text.em_advance(cx.font_cache());
2146        let overscroll = vec2f(em_width, 0.);
2147        let snapshot = {
2148            editor.set_visible_line_count(size.y() / line_height, cx);
2149
2150            let editor_width = text_width - gutter_margin - overscroll.x() - em_width;
2151            let wrap_width = match editor.soft_wrap_mode(cx) {
2152                SoftWrap::None => (MAX_LINE_LEN / 2) as f32 * em_advance,
2153                SoftWrap::EditorWidth => editor_width,
2154                SoftWrap::Column(column) => editor_width.min(column as f32 * em_advance),
2155            };
2156
2157            if editor.set_wrap_width(Some(wrap_width), cx) {
2158                editor.snapshot(cx)
2159            } else {
2160                snapshot
2161            }
2162        };
2163
2164        let wrap_guides = editor
2165            .wrap_guides(cx)
2166            .iter()
2167            .map(|(guide, active)| (self.column_pixels(*guide, cx), *active))
2168            .collect();
2169
2170        let scroll_height = (snapshot.max_point().row() + 1) as f32 * line_height;
2171        if let EditorMode::AutoHeight { max_lines } = snapshot.mode {
2172            size.set_y(
2173                scroll_height
2174                    .min(constraint.max_along(Axis::Vertical))
2175                    .max(constraint.min_along(Axis::Vertical))
2176                    .min(line_height * max_lines as f32),
2177            )
2178        } else if let EditorMode::SingleLine = snapshot.mode {
2179            size.set_y(
2180                line_height
2181                    .min(constraint.max_along(Axis::Vertical))
2182                    .max(constraint.min_along(Axis::Vertical)),
2183            )
2184        } else if size.y().is_infinite() {
2185            size.set_y(scroll_height);
2186        }
2187        let gutter_size = vec2f(gutter_width, size.y());
2188        let text_size = vec2f(text_width, size.y());
2189
2190        let autoscroll_horizontally = editor.autoscroll_vertically(size.y(), line_height, cx);
2191        let mut snapshot = editor.snapshot(cx);
2192
2193        let scroll_position = snapshot.scroll_position();
2194        // The scroll position is a fractional point, the whole number of which represents
2195        // the top of the window in terms of display rows.
2196        let start_row = scroll_position.y() as u32;
2197        let height_in_lines = size.y() / line_height;
2198        let max_row = snapshot.max_point().row();
2199
2200        // Add 1 to ensure selections bleed off screen
2201        let end_row = 1 + cmp::min(
2202            (scroll_position.y() + height_in_lines).ceil() as u32,
2203            max_row,
2204        );
2205
2206        let start_anchor = if start_row == 0 {
2207            Anchor::min()
2208        } else {
2209            snapshot
2210                .buffer_snapshot
2211                .anchor_before(DisplayPoint::new(start_row, 0).to_offset(&snapshot, Bias::Left))
2212        };
2213        let end_anchor = if end_row > max_row {
2214            Anchor::max()
2215        } else {
2216            snapshot
2217                .buffer_snapshot
2218                .anchor_before(DisplayPoint::new(end_row, 0).to_offset(&snapshot, Bias::Right))
2219        };
2220
2221        let mut selections: Vec<(Option<ReplicaId>, Vec<SelectionLayout>)> = Vec::new();
2222        let mut active_rows = BTreeMap::new();
2223        let mut fold_ranges = Vec::new();
2224        let is_singleton = editor.is_singleton(cx);
2225
2226        let highlighted_rows = editor.highlighted_rows();
2227        let theme = theme::current(cx);
2228        let highlighted_ranges = editor.background_highlights_in_range(
2229            start_anchor..end_anchor,
2230            &snapshot.display_snapshot,
2231            theme.as_ref(),
2232        );
2233
2234        fold_ranges.extend(
2235            snapshot
2236                .folds_in_range(start_anchor..end_anchor)
2237                .map(|anchor| {
2238                    let start = anchor.start.to_point(&snapshot.buffer_snapshot);
2239                    (
2240                        start.row,
2241                        start.to_display_point(&snapshot.display_snapshot)
2242                            ..anchor.end.to_display_point(&snapshot),
2243                    )
2244                }),
2245        );
2246
2247        let mut remote_selections = HashMap::default();
2248        for (replica_id, line_mode, cursor_shape, selection) in snapshot
2249            .buffer_snapshot
2250            .remote_selections_in_range(&(start_anchor..end_anchor))
2251        {
2252            let replica_id = if let Some(mapping) = &editor.replica_id_mapping {
2253                mapping.get(&replica_id).copied()
2254            } else {
2255                None
2256            };
2257
2258            // The local selections match the leader's selections.
2259            if replica_id.is_some() && replica_id == editor.leader_replica_id {
2260                continue;
2261            }
2262            remote_selections
2263                .entry(replica_id)
2264                .or_insert(Vec::new())
2265                .push(SelectionLayout::new(
2266                    selection,
2267                    line_mode,
2268                    cursor_shape,
2269                    &snapshot.display_snapshot,
2270                    false,
2271                    false,
2272                ));
2273        }
2274        selections.extend(remote_selections);
2275
2276        let mut newest_selection_head = None;
2277
2278        if editor.show_local_selections {
2279            let mut local_selections: Vec<Selection<Point>> = editor
2280                .selections
2281                .disjoint_in_range(start_anchor..end_anchor, cx);
2282            local_selections.extend(editor.selections.pending(cx));
2283            let mut layouts = Vec::new();
2284            let newest = editor.selections.newest(cx);
2285            for selection in local_selections.drain(..) {
2286                let is_empty = selection.start == selection.end;
2287                let is_newest = selection == newest;
2288
2289                let layout = SelectionLayout::new(
2290                    selection,
2291                    editor.selections.line_mode,
2292                    editor.cursor_shape,
2293                    &snapshot.display_snapshot,
2294                    is_newest,
2295                    true,
2296                );
2297                if is_newest {
2298                    newest_selection_head = Some(layout.head);
2299                }
2300
2301                for row in cmp::max(layout.active_rows.start, start_row)
2302                    ..=cmp::min(layout.active_rows.end, end_row)
2303                {
2304                    let contains_non_empty_selection = active_rows.entry(row).or_insert(!is_empty);
2305                    *contains_non_empty_selection |= !is_empty;
2306                }
2307                layouts.push(layout);
2308            }
2309
2310            // Render the local selections in the leader's color when following.
2311            let local_replica_id = if let Some(leader_replica_id) = editor.leader_replica_id {
2312                leader_replica_id
2313            } else {
2314                let replica_id = editor.replica_id(cx);
2315                if let Some(mapping) = &editor.replica_id_mapping {
2316                    mapping.get(&replica_id).copied().unwrap_or(replica_id)
2317                } else {
2318                    replica_id
2319                }
2320            };
2321
2322            selections.push((Some(local_replica_id), layouts));
2323        }
2324
2325        let scrollbar_settings = &settings::get::<EditorSettings>(cx).scrollbar;
2326        let show_scrollbars = match scrollbar_settings.show {
2327            ShowScrollbar::Auto => {
2328                // Git
2329                (is_singleton && scrollbar_settings.git_diff && snapshot.buffer_snapshot.has_git_diffs())
2330                ||
2331                // Selections
2332                (is_singleton && scrollbar_settings.selections && !highlighted_ranges.is_empty())
2333                // Scrollmanager
2334                || editor.scroll_manager.scrollbars_visible()
2335            }
2336            ShowScrollbar::System => editor.scroll_manager.scrollbars_visible(),
2337            ShowScrollbar::Always => true,
2338            ShowScrollbar::Never => false,
2339        };
2340
2341        let fold_ranges: Vec<(BufferRow, Range<DisplayPoint>, Color)> = fold_ranges
2342            .into_iter()
2343            .map(|(id, fold)| {
2344                let color = self
2345                    .style
2346                    .folds
2347                    .ellipses
2348                    .background
2349                    .style_for(&mut cx.mouse_state::<FoldMarkers>(id as usize))
2350                    .color;
2351
2352                (id, fold, color)
2353            })
2354            .collect();
2355
2356        let (line_number_layouts, fold_statuses) = self.layout_line_numbers(
2357            start_row..end_row,
2358            &active_rows,
2359            is_singleton,
2360            &snapshot,
2361            cx,
2362        );
2363
2364        let display_hunks = self.layout_git_gutters(start_row..end_row, &snapshot);
2365
2366        let scrollbar_row_range = scroll_position.y()..(scroll_position.y() + height_in_lines);
2367
2368        let mut max_visible_line_width = 0.0;
2369        let line_layouts =
2370            self.layout_lines(start_row..end_row, &line_number_layouts, &snapshot, cx);
2371        for line_with_invisibles in &line_layouts {
2372            if line_with_invisibles.line.width() > max_visible_line_width {
2373                max_visible_line_width = line_with_invisibles.line.width();
2374            }
2375        }
2376
2377        let style = self.style.clone();
2378        let longest_line_width = layout_line(
2379            snapshot.longest_row(),
2380            &snapshot,
2381            &style,
2382            cx.text_layout_cache(),
2383        )
2384        .width();
2385        let scroll_width = longest_line_width.max(max_visible_line_width) + overscroll.x();
2386        let em_width = style.text.em_width(cx.font_cache());
2387        let (scroll_width, blocks) = self.layout_blocks(
2388            start_row..end_row,
2389            &snapshot,
2390            size.x(),
2391            scroll_width,
2392            gutter_padding,
2393            gutter_width,
2394            em_width,
2395            gutter_width + gutter_margin,
2396            line_height,
2397            &style,
2398            &line_layouts,
2399            editor,
2400            cx,
2401        );
2402
2403        let scroll_max = vec2f(
2404            ((scroll_width - text_size.x()) / em_width).max(0.0),
2405            max_row as f32,
2406        );
2407
2408        let clamped = editor.scroll_manager.clamp_scroll_left(scroll_max.x());
2409
2410        let autoscrolled = if autoscroll_horizontally {
2411            editor.autoscroll_horizontally(
2412                start_row,
2413                text_size.x(),
2414                scroll_width,
2415                em_width,
2416                &line_layouts,
2417                cx,
2418            )
2419        } else {
2420            false
2421        };
2422
2423        if clamped || autoscrolled {
2424            snapshot = editor.snapshot(cx);
2425        }
2426
2427        let style = editor.style(cx);
2428
2429        let mut context_menu = None;
2430        let mut code_actions_indicator = None;
2431        if let Some(newest_selection_head) = newest_selection_head {
2432            if (start_row..end_row).contains(&newest_selection_head.row()) {
2433                if editor.context_menu_visible() {
2434                    context_menu =
2435                        editor.render_context_menu(newest_selection_head, style.clone(), cx);
2436                }
2437
2438                let active = matches!(
2439                    editor.context_menu,
2440                    Some(crate::ContextMenu::CodeActions(_))
2441                );
2442
2443                code_actions_indicator = editor
2444                    .render_code_actions_indicator(&style, active, cx)
2445                    .map(|indicator| (newest_selection_head.row(), indicator));
2446            }
2447        }
2448
2449        let visible_rows = start_row..start_row + line_layouts.len() as u32;
2450        let mut hover = editor
2451            .hover_state
2452            .render(&snapshot, &style, visible_rows, cx);
2453        let mode = editor.mode;
2454
2455        let mut fold_indicators = editor.render_fold_indicators(
2456            fold_statuses,
2457            &style,
2458            editor.gutter_hovered,
2459            line_height,
2460            gutter_margin,
2461            cx,
2462        );
2463
2464        if let Some((_, context_menu)) = context_menu.as_mut() {
2465            context_menu.layout(
2466                SizeConstraint {
2467                    min: Vector2F::zero(),
2468                    max: vec2f(
2469                        cx.window_size().x() * 0.7,
2470                        (12. * line_height).min((size.y() - line_height) / 2.),
2471                    ),
2472                },
2473                editor,
2474                cx,
2475            );
2476        }
2477
2478        if let Some((_, indicator)) = code_actions_indicator.as_mut() {
2479            indicator.layout(
2480                SizeConstraint::strict_along(
2481                    Axis::Vertical,
2482                    line_height * style.code_actions.vertical_scale,
2483                ),
2484                editor,
2485                cx,
2486            );
2487        }
2488
2489        for fold_indicator in fold_indicators.iter_mut() {
2490            if let Some(indicator) = fold_indicator.as_mut() {
2491                indicator.layout(
2492                    SizeConstraint::strict_along(
2493                        Axis::Vertical,
2494                        line_height * style.code_actions.vertical_scale,
2495                    ),
2496                    editor,
2497                    cx,
2498                );
2499            }
2500        }
2501
2502        if let Some((_, hover_popovers)) = hover.as_mut() {
2503            for hover_popover in hover_popovers.iter_mut() {
2504                hover_popover.layout(
2505                    SizeConstraint {
2506                        min: Vector2F::zero(),
2507                        max: vec2f(
2508                            (120. * em_width) // Default size
2509                                .min(size.x() / 2.) // Shrink to half of the editor width
2510                                .max(MIN_POPOVER_CHARACTER_WIDTH * em_width), // Apply minimum width of 20 characters
2511                            (16. * line_height) // Default size
2512                                .min(size.y() / 2.) // Shrink to half of the editor height
2513                                .max(MIN_POPOVER_LINE_HEIGHT * line_height), // Apply minimum height of 4 lines
2514                        ),
2515                    },
2516                    editor,
2517                    cx,
2518                );
2519            }
2520        }
2521
2522        let invisible_symbol_font_size = self.style.text.font_size / 2.0;
2523        let invisible_symbol_style = RunStyle {
2524            color: self.style.whitespace,
2525            font_id: self.style.text.font_id,
2526            underline: Default::default(),
2527        };
2528
2529        (
2530            size,
2531            LayoutState {
2532                mode,
2533                position_map: Arc::new(PositionMap {
2534                    size,
2535                    scroll_max,
2536                    line_layouts,
2537                    line_height,
2538                    em_width,
2539                    em_advance,
2540                    snapshot,
2541                }),
2542                visible_display_row_range: start_row..end_row,
2543                wrap_guides,
2544                gutter_size,
2545                gutter_padding,
2546                text_size,
2547                scrollbar_row_range,
2548                show_scrollbars,
2549                is_singleton,
2550                max_row,
2551                gutter_margin,
2552                active_rows,
2553                highlighted_rows,
2554                highlighted_ranges,
2555                fold_ranges,
2556                line_number_layouts,
2557                display_hunks,
2558                blocks,
2559                selections,
2560                context_menu,
2561                code_actions_indicator,
2562                fold_indicators,
2563                tab_invisible: cx.text_layout_cache().layout_str(
2564                    "→",
2565                    invisible_symbol_font_size,
2566                    &[("→".len(), invisible_symbol_style)],
2567                ),
2568                space_invisible: cx.text_layout_cache().layout_str(
2569                    "•",
2570                    invisible_symbol_font_size,
2571                    &[("•".len(), invisible_symbol_style)],
2572                ),
2573                hover_popovers: hover,
2574            },
2575        )
2576    }
2577
2578    fn paint(
2579        &mut self,
2580        scene: &mut SceneBuilder,
2581        bounds: RectF,
2582        visible_bounds: RectF,
2583        layout: &mut Self::LayoutState,
2584        editor: &mut Editor,
2585        cx: &mut PaintContext<Editor>,
2586    ) -> Self::PaintState {
2587        let visible_bounds = bounds.intersection(visible_bounds).unwrap_or_default();
2588        scene.push_layer(Some(visible_bounds));
2589
2590        let gutter_bounds = RectF::new(bounds.origin(), layout.gutter_size);
2591        let text_bounds = RectF::new(
2592            bounds.origin() + vec2f(layout.gutter_size.x(), 0.0),
2593            layout.text_size,
2594        );
2595
2596        Self::attach_mouse_handlers(
2597            scene,
2598            &layout.position_map,
2599            layout.hover_popovers.is_some(),
2600            visible_bounds,
2601            text_bounds,
2602            gutter_bounds,
2603            bounds,
2604            cx,
2605        );
2606
2607        self.paint_background(scene, gutter_bounds, text_bounds, layout);
2608        if layout.gutter_size.x() > 0. {
2609            self.paint_gutter(scene, gutter_bounds, visible_bounds, layout, editor, cx);
2610        }
2611        self.paint_text(scene, text_bounds, visible_bounds, layout, editor, cx);
2612
2613        scene.push_layer(Some(bounds));
2614        if !layout.blocks.is_empty() {
2615            self.paint_blocks(scene, bounds, visible_bounds, layout, editor, cx);
2616        }
2617        self.paint_scrollbar(scene, bounds, layout, cx, &editor);
2618        scene.pop_layer();
2619
2620        scene.pop_layer();
2621    }
2622
2623    fn rect_for_text_range(
2624        &self,
2625        range_utf16: Range<usize>,
2626        bounds: RectF,
2627        _: RectF,
2628        layout: &Self::LayoutState,
2629        _: &Self::PaintState,
2630        _: &Editor,
2631        _: &ViewContext<Editor>,
2632    ) -> Option<RectF> {
2633        let text_bounds = RectF::new(
2634            bounds.origin() + vec2f(layout.gutter_size.x(), 0.0),
2635            layout.text_size,
2636        );
2637        let content_origin = text_bounds.origin() + vec2f(layout.gutter_margin, 0.);
2638        let scroll_position = layout.position_map.snapshot.scroll_position();
2639        let start_row = scroll_position.y() as u32;
2640        let scroll_top = scroll_position.y() * layout.position_map.line_height;
2641        let scroll_left = scroll_position.x() * layout.position_map.em_width;
2642
2643        let range_start = OffsetUtf16(range_utf16.start)
2644            .to_display_point(&layout.position_map.snapshot.display_snapshot);
2645        if range_start.row() < start_row {
2646            return None;
2647        }
2648
2649        let line = &layout
2650            .position_map
2651            .line_layouts
2652            .get((range_start.row() - start_row) as usize)?
2653            .line;
2654        let range_start_x = line.x_for_index(range_start.column() as usize);
2655        let range_start_y = range_start.row() as f32 * layout.position_map.line_height;
2656        Some(RectF::new(
2657            content_origin
2658                + vec2f(
2659                    range_start_x,
2660                    range_start_y + layout.position_map.line_height,
2661                )
2662                - vec2f(scroll_left, scroll_top),
2663            vec2f(
2664                layout.position_map.em_width,
2665                layout.position_map.line_height,
2666            ),
2667        ))
2668    }
2669
2670    fn debug(
2671        &self,
2672        bounds: RectF,
2673        _: &Self::LayoutState,
2674        _: &Self::PaintState,
2675        _: &Editor,
2676        _: &ViewContext<Editor>,
2677    ) -> json::Value {
2678        json!({
2679            "type": "BufferElement",
2680            "bounds": bounds.to_json()
2681        })
2682    }
2683}
2684
2685type BufferRow = u32;
2686
2687pub struct LayoutState {
2688    position_map: Arc<PositionMap>,
2689    gutter_size: Vector2F,
2690    gutter_padding: f32,
2691    gutter_margin: f32,
2692    text_size: Vector2F,
2693    mode: EditorMode,
2694    wrap_guides: SmallVec<[(f32, bool); 2]>,
2695    visible_display_row_range: Range<u32>,
2696    active_rows: BTreeMap<u32, bool>,
2697    highlighted_rows: Option<Range<u32>>,
2698    line_number_layouts: Vec<Option<text_layout::Line>>,
2699    display_hunks: Vec<DisplayDiffHunk>,
2700    blocks: Vec<BlockLayout>,
2701    highlighted_ranges: Vec<(Range<DisplayPoint>, Color)>,
2702    fold_ranges: Vec<(BufferRow, Range<DisplayPoint>, Color)>,
2703    selections: Vec<(Option<ReplicaId>, Vec<SelectionLayout>)>,
2704    scrollbar_row_range: Range<f32>,
2705    show_scrollbars: bool,
2706    is_singleton: bool,
2707    max_row: u32,
2708    context_menu: Option<(DisplayPoint, AnyElement<Editor>)>,
2709    code_actions_indicator: Option<(u32, AnyElement<Editor>)>,
2710    hover_popovers: Option<(DisplayPoint, Vec<AnyElement<Editor>>)>,
2711    fold_indicators: Vec<Option<AnyElement<Editor>>>,
2712    tab_invisible: Line,
2713    space_invisible: Line,
2714}
2715
2716struct PositionMap {
2717    size: Vector2F,
2718    line_height: f32,
2719    scroll_max: Vector2F,
2720    em_width: f32,
2721    em_advance: f32,
2722    line_layouts: Vec<LineWithInvisibles>,
2723    snapshot: EditorSnapshot,
2724}
2725
2726#[derive(Debug)]
2727struct PointForPosition {
2728    previous_valid: DisplayPoint,
2729    next_valid: DisplayPoint,
2730    exact_unclipped: DisplayPoint,
2731    column_overshoot_after_line_end: u32,
2732}
2733
2734impl PointForPosition {
2735    fn as_valid(&self) -> Option<DisplayPoint> {
2736        if self.previous_valid == self.exact_unclipped && self.next_valid == self.exact_unclipped {
2737            Some(self.previous_valid)
2738        } else {
2739            None
2740        }
2741    }
2742}
2743
2744impl PositionMap {
2745    fn point_for_position(&self, text_bounds: RectF, position: Vector2F) -> PointForPosition {
2746        let scroll_position = self.snapshot.scroll_position();
2747        let position = position - text_bounds.origin();
2748        let y = position.y().max(0.0).min(self.size.y());
2749        let x = position.x() + (scroll_position.x() * self.em_width);
2750        let row = (y / self.line_height + scroll_position.y()) as u32;
2751        let (column, x_overshoot_after_line_end) = if let Some(line) = self
2752            .line_layouts
2753            .get(row as usize - scroll_position.y() as usize)
2754            .map(|line_with_spaces| &line_with_spaces.line)
2755        {
2756            if let Some(ix) = line.index_for_x(x) {
2757                (ix as u32, 0.0)
2758            } else {
2759                (line.len() as u32, 0f32.max(x - line.width()))
2760            }
2761        } else {
2762            (0, x)
2763        };
2764
2765        let mut exact_unclipped = DisplayPoint::new(row, column);
2766        let previous_valid = self.snapshot.clip_point(exact_unclipped, Bias::Left);
2767        let next_valid = self.snapshot.clip_point(exact_unclipped, Bias::Right);
2768
2769        let column_overshoot_after_line_end = (x_overshoot_after_line_end / self.em_advance) as u32;
2770        *exact_unclipped.column_mut() += column_overshoot_after_line_end;
2771        PointForPosition {
2772            previous_valid,
2773            next_valid,
2774            exact_unclipped,
2775            column_overshoot_after_line_end,
2776        }
2777    }
2778}
2779
2780struct BlockLayout {
2781    row: u32,
2782    element: AnyElement<Editor>,
2783    style: BlockStyle,
2784}
2785
2786fn layout_line(
2787    row: u32,
2788    snapshot: &EditorSnapshot,
2789    style: &EditorStyle,
2790    layout_cache: &TextLayoutCache,
2791) -> text_layout::Line {
2792    let mut line = snapshot.line(row);
2793
2794    if line.len() > MAX_LINE_LEN {
2795        let mut len = MAX_LINE_LEN;
2796        while !line.is_char_boundary(len) {
2797            len -= 1;
2798        }
2799
2800        line.truncate(len);
2801    }
2802
2803    layout_cache.layout_str(
2804        &line,
2805        style.text.font_size,
2806        &[(
2807            snapshot.line_len(row) as usize,
2808            RunStyle {
2809                font_id: style.text.font_id,
2810                color: Color::black(),
2811                underline: Default::default(),
2812            },
2813        )],
2814    )
2815}
2816
2817#[derive(Debug)]
2818pub struct Cursor {
2819    origin: Vector2F,
2820    block_width: f32,
2821    line_height: f32,
2822    color: Color,
2823    shape: CursorShape,
2824    block_text: Option<Line>,
2825}
2826
2827impl Cursor {
2828    pub fn new(
2829        origin: Vector2F,
2830        block_width: f32,
2831        line_height: f32,
2832        color: Color,
2833        shape: CursorShape,
2834        block_text: Option<Line>,
2835    ) -> Cursor {
2836        Cursor {
2837            origin,
2838            block_width,
2839            line_height,
2840            color,
2841            shape,
2842            block_text,
2843        }
2844    }
2845
2846    pub fn bounding_rect(&self, origin: Vector2F) -> RectF {
2847        RectF::new(
2848            self.origin + origin,
2849            vec2f(self.block_width, self.line_height),
2850        )
2851    }
2852
2853    pub fn paint(&self, scene: &mut SceneBuilder, origin: Vector2F, cx: &mut WindowContext) {
2854        let bounds = match self.shape {
2855            CursorShape::Bar => RectF::new(self.origin + origin, vec2f(2.0, self.line_height)),
2856            CursorShape::Block | CursorShape::Hollow => RectF::new(
2857                self.origin + origin,
2858                vec2f(self.block_width, self.line_height),
2859            ),
2860            CursorShape::Underscore => RectF::new(
2861                self.origin + origin + Vector2F::new(0.0, self.line_height - 2.0),
2862                vec2f(self.block_width, 2.0),
2863            ),
2864        };
2865
2866        //Draw background or border quad
2867        if matches!(self.shape, CursorShape::Hollow) {
2868            scene.push_quad(Quad {
2869                bounds,
2870                background: None,
2871                border: Border::all(1., self.color),
2872                corner_radii: Default::default(),
2873            });
2874        } else {
2875            scene.push_quad(Quad {
2876                bounds,
2877                background: Some(self.color),
2878                border: Default::default(),
2879                corner_radii: Default::default(),
2880            });
2881        }
2882
2883        if let Some(block_text) = &self.block_text {
2884            block_text.paint(scene, self.origin + origin, bounds, self.line_height, cx);
2885        }
2886    }
2887
2888    pub fn shape(&self) -> CursorShape {
2889        self.shape
2890    }
2891}
2892
2893#[derive(Debug)]
2894pub struct HighlightedRange {
2895    pub start_y: f32,
2896    pub line_height: f32,
2897    pub lines: Vec<HighlightedRangeLine>,
2898    pub color: Color,
2899    pub corner_radius: f32,
2900}
2901
2902#[derive(Debug)]
2903pub struct HighlightedRangeLine {
2904    pub start_x: f32,
2905    pub end_x: f32,
2906}
2907
2908impl HighlightedRange {
2909    pub fn paint(&self, bounds: RectF, scene: &mut SceneBuilder) {
2910        if self.lines.len() >= 2 && self.lines[0].start_x > self.lines[1].end_x {
2911            self.paint_lines(self.start_y, &self.lines[0..1], bounds, scene);
2912            self.paint_lines(
2913                self.start_y + self.line_height,
2914                &self.lines[1..],
2915                bounds,
2916                scene,
2917            );
2918        } else {
2919            self.paint_lines(self.start_y, &self.lines, bounds, scene);
2920        }
2921    }
2922
2923    fn paint_lines(
2924        &self,
2925        start_y: f32,
2926        lines: &[HighlightedRangeLine],
2927        bounds: RectF,
2928        scene: &mut SceneBuilder,
2929    ) {
2930        if lines.is_empty() {
2931            return;
2932        }
2933
2934        let mut path = PathBuilder::new();
2935        let first_line = lines.first().unwrap();
2936        let last_line = lines.last().unwrap();
2937
2938        let first_top_left = vec2f(first_line.start_x, start_y);
2939        let first_top_right = vec2f(first_line.end_x, start_y);
2940
2941        let curve_height = vec2f(0., self.corner_radius);
2942        let curve_width = |start_x: f32, end_x: f32| {
2943            let max = (end_x - start_x) / 2.;
2944            let width = if max < self.corner_radius {
2945                max
2946            } else {
2947                self.corner_radius
2948            };
2949
2950            vec2f(width, 0.)
2951        };
2952
2953        let top_curve_width = curve_width(first_line.start_x, first_line.end_x);
2954        path.reset(first_top_right - top_curve_width);
2955        path.curve_to(first_top_right + curve_height, first_top_right);
2956
2957        let mut iter = lines.iter().enumerate().peekable();
2958        while let Some((ix, line)) = iter.next() {
2959            let bottom_right = vec2f(line.end_x, start_y + (ix + 1) as f32 * self.line_height);
2960
2961            if let Some((_, next_line)) = iter.peek() {
2962                let next_top_right = vec2f(next_line.end_x, bottom_right.y());
2963
2964                match next_top_right.x().partial_cmp(&bottom_right.x()).unwrap() {
2965                    Ordering::Equal => {
2966                        path.line_to(bottom_right);
2967                    }
2968                    Ordering::Less => {
2969                        let curve_width = curve_width(next_top_right.x(), bottom_right.x());
2970                        path.line_to(bottom_right - curve_height);
2971                        if self.corner_radius > 0. {
2972                            path.curve_to(bottom_right - curve_width, bottom_right);
2973                        }
2974                        path.line_to(next_top_right + curve_width);
2975                        if self.corner_radius > 0. {
2976                            path.curve_to(next_top_right + curve_height, next_top_right);
2977                        }
2978                    }
2979                    Ordering::Greater => {
2980                        let curve_width = curve_width(bottom_right.x(), next_top_right.x());
2981                        path.line_to(bottom_right - curve_height);
2982                        if self.corner_radius > 0. {
2983                            path.curve_to(bottom_right + curve_width, bottom_right);
2984                        }
2985                        path.line_to(next_top_right - curve_width);
2986                        if self.corner_radius > 0. {
2987                            path.curve_to(next_top_right + curve_height, next_top_right);
2988                        }
2989                    }
2990                }
2991            } else {
2992                let curve_width = curve_width(line.start_x, line.end_x);
2993                path.line_to(bottom_right - curve_height);
2994                if self.corner_radius > 0. {
2995                    path.curve_to(bottom_right - curve_width, bottom_right);
2996                }
2997
2998                let bottom_left = vec2f(line.start_x, bottom_right.y());
2999                path.line_to(bottom_left + curve_width);
3000                if self.corner_radius > 0. {
3001                    path.curve_to(bottom_left - curve_height, bottom_left);
3002                }
3003            }
3004        }
3005
3006        if first_line.start_x > last_line.start_x {
3007            let curve_width = curve_width(last_line.start_x, first_line.start_x);
3008            let second_top_left = vec2f(last_line.start_x, start_y + self.line_height);
3009            path.line_to(second_top_left + curve_height);
3010            if self.corner_radius > 0. {
3011                path.curve_to(second_top_left + curve_width, second_top_left);
3012            }
3013            let first_bottom_left = vec2f(first_line.start_x, second_top_left.y());
3014            path.line_to(first_bottom_left - curve_width);
3015            if self.corner_radius > 0. {
3016                path.curve_to(first_bottom_left - curve_height, first_bottom_left);
3017            }
3018        }
3019
3020        path.line_to(first_top_left + curve_height);
3021        if self.corner_radius > 0. {
3022            path.curve_to(first_top_left + top_curve_width, first_top_left);
3023        }
3024        path.line_to(first_top_right - top_curve_width);
3025
3026        scene.push_path(path.build(self.color, Some(bounds)));
3027    }
3028}
3029
3030fn range_to_bounds(
3031    range: &Range<DisplayPoint>,
3032    content_origin: Vector2F,
3033    scroll_left: f32,
3034    scroll_top: f32,
3035    visible_row_range: &Range<u32>,
3036    line_end_overshoot: f32,
3037    position_map: &PositionMap,
3038) -> impl Iterator<Item = RectF> {
3039    let mut bounds: SmallVec<[RectF; 1]> = SmallVec::new();
3040
3041    if range.start == range.end {
3042        return bounds.into_iter();
3043    }
3044
3045    let start_row = visible_row_range.start;
3046    let end_row = visible_row_range.end;
3047
3048    let row_range = if range.end.column() == 0 {
3049        cmp::max(range.start.row(), start_row)..cmp::min(range.end.row(), end_row)
3050    } else {
3051        cmp::max(range.start.row(), start_row)..cmp::min(range.end.row() + 1, end_row)
3052    };
3053
3054    let first_y =
3055        content_origin.y() + row_range.start as f32 * position_map.line_height - scroll_top;
3056
3057    for (idx, row) in row_range.enumerate() {
3058        let line_layout = &position_map.line_layouts[(row - start_row) as usize].line;
3059
3060        let start_x = if row == range.start.row() {
3061            content_origin.x() + line_layout.x_for_index(range.start.column() as usize)
3062                - scroll_left
3063        } else {
3064            content_origin.x() - scroll_left
3065        };
3066
3067        let end_x = if row == range.end.row() {
3068            content_origin.x() + line_layout.x_for_index(range.end.column() as usize) - scroll_left
3069        } else {
3070            content_origin.x() + line_layout.width() + line_end_overshoot - scroll_left
3071        };
3072
3073        bounds.push(RectF::from_points(
3074            vec2f(start_x, first_y + position_map.line_height * idx as f32),
3075            vec2f(end_x, first_y + position_map.line_height * (idx + 1) as f32),
3076        ))
3077    }
3078
3079    bounds.into_iter()
3080}
3081
3082pub fn scale_vertical_mouse_autoscroll_delta(delta: f32) -> f32 {
3083    delta.powf(1.5) / 100.0
3084}
3085
3086fn scale_horizontal_mouse_autoscroll_delta(delta: f32) -> f32 {
3087    delta.powf(1.2) / 300.0
3088}
3089
3090#[cfg(test)]
3091mod tests {
3092    use super::*;
3093    use crate::{
3094        display_map::{BlockDisposition, BlockProperties},
3095        editor_tests::{init_test, update_test_language_settings},
3096        Editor, MultiBuffer,
3097    };
3098    use gpui::TestAppContext;
3099    use language::language_settings;
3100    use log::info;
3101    use std::{num::NonZeroU32, sync::Arc};
3102    use util::test::sample_text;
3103
3104    #[gpui::test]
3105    fn test_layout_line_numbers(cx: &mut TestAppContext) {
3106        init_test(cx, |_| {});
3107
3108        let editor = cx
3109            .add_window(|cx| {
3110                let buffer = MultiBuffer::build_simple(&sample_text(6, 6, 'a'), cx);
3111                Editor::new(EditorMode::Full, buffer, None, None, cx)
3112            })
3113            .root(cx);
3114        let element = EditorElement::new(editor.read_with(cx, |editor, cx| editor.style(cx)));
3115
3116        let layouts = editor.update(cx, |editor, cx| {
3117            let snapshot = editor.snapshot(cx);
3118            element
3119                .layout_line_numbers(0..6, &Default::default(), false, &snapshot, cx)
3120                .0
3121        });
3122        assert_eq!(layouts.len(), 6);
3123    }
3124
3125    #[gpui::test]
3126    async fn test_vim_visual_selections(cx: &mut TestAppContext) {
3127        init_test(cx, |_| {});
3128
3129        let editor = cx
3130            .add_window(|cx| {
3131                let buffer = MultiBuffer::build_simple(&(sample_text(6, 6, 'a') + "\n"), cx);
3132                Editor::new(EditorMode::Full, buffer, None, None, cx)
3133            })
3134            .root(cx);
3135        let mut element = EditorElement::new(editor.read_with(cx, |editor, cx| editor.style(cx)));
3136        let (_, state) = editor.update(cx, |editor, cx| {
3137            editor.cursor_shape = CursorShape::Block;
3138            editor.change_selections(None, cx, |s| {
3139                s.select_ranges([
3140                    Point::new(0, 0)..Point::new(1, 0),
3141                    Point::new(3, 2)..Point::new(3, 3),
3142                    Point::new(5, 6)..Point::new(6, 0),
3143                ]);
3144            });
3145            let mut new_parents = Default::default();
3146            let mut notify_views_if_parents_change = Default::default();
3147            let mut layout_cx = LayoutContext::new(
3148                cx,
3149                &mut new_parents,
3150                &mut notify_views_if_parents_change,
3151                false,
3152            );
3153            element.layout(
3154                SizeConstraint::new(vec2f(500., 500.), vec2f(500., 500.)),
3155                editor,
3156                &mut layout_cx,
3157            )
3158        });
3159        assert_eq!(state.selections.len(), 1);
3160        let local_selections = &state.selections[0].1;
3161        assert_eq!(local_selections.len(), 3);
3162        // moves cursor back one line
3163        assert_eq!(local_selections[0].head, DisplayPoint::new(0, 6));
3164        assert_eq!(
3165            local_selections[0].range,
3166            DisplayPoint::new(0, 0)..DisplayPoint::new(1, 0)
3167        );
3168
3169        // moves cursor back one column
3170        assert_eq!(
3171            local_selections[1].range,
3172            DisplayPoint::new(3, 2)..DisplayPoint::new(3, 3)
3173        );
3174        assert_eq!(local_selections[1].head, DisplayPoint::new(3, 2));
3175
3176        // leaves cursor on the max point
3177        assert_eq!(
3178            local_selections[2].range,
3179            DisplayPoint::new(5, 6)..DisplayPoint::new(6, 0)
3180        );
3181        assert_eq!(local_selections[2].head, DisplayPoint::new(6, 0));
3182
3183        // active lines does not include 1 (even though the range of the selection does)
3184        assert_eq!(
3185            state.active_rows.keys().cloned().collect::<Vec<u32>>(),
3186            vec![0, 3, 5, 6]
3187        );
3188
3189        // multi-buffer support
3190        // in DisplayPoint co-ordinates, this is what we're dealing with:
3191        //  0: [[file
3192        //  1:   header]]
3193        //  2: aaaaaa
3194        //  3: bbbbbb
3195        //  4: cccccc
3196        //  5:
3197        //  6: ...
3198        //  7: ffffff
3199        //  8: gggggg
3200        //  9: hhhhhh
3201        // 10:
3202        // 11: [[file
3203        // 12:   header]]
3204        // 13: bbbbbb
3205        // 14: cccccc
3206        // 15: dddddd
3207        let editor = cx
3208            .add_window(|cx| {
3209                let buffer = MultiBuffer::build_multi(
3210                    [
3211                        (
3212                            &(sample_text(8, 6, 'a') + "\n"),
3213                            vec![
3214                                Point::new(0, 0)..Point::new(3, 0),
3215                                Point::new(4, 0)..Point::new(7, 0),
3216                            ],
3217                        ),
3218                        (
3219                            &(sample_text(8, 6, 'a') + "\n"),
3220                            vec![Point::new(1, 0)..Point::new(3, 0)],
3221                        ),
3222                    ],
3223                    cx,
3224                );
3225                Editor::new(EditorMode::Full, buffer, None, None, cx)
3226            })
3227            .root(cx);
3228        let mut element = EditorElement::new(editor.read_with(cx, |editor, cx| editor.style(cx)));
3229        let (_, state) = editor.update(cx, |editor, cx| {
3230            editor.cursor_shape = CursorShape::Block;
3231            editor.change_selections(None, cx, |s| {
3232                s.select_display_ranges([
3233                    DisplayPoint::new(4, 0)..DisplayPoint::new(7, 0),
3234                    DisplayPoint::new(10, 0)..DisplayPoint::new(13, 0),
3235                ]);
3236            });
3237            let mut new_parents = Default::default();
3238            let mut notify_views_if_parents_change = Default::default();
3239            let mut layout_cx = LayoutContext::new(
3240                cx,
3241                &mut new_parents,
3242                &mut notify_views_if_parents_change,
3243                false,
3244            );
3245            element.layout(
3246                SizeConstraint::new(vec2f(500., 500.), vec2f(500., 500.)),
3247                editor,
3248                &mut layout_cx,
3249            )
3250        });
3251
3252        assert_eq!(state.selections.len(), 1);
3253        let local_selections = &state.selections[0].1;
3254        assert_eq!(local_selections.len(), 2);
3255
3256        // moves cursor on excerpt boundary back a line
3257        // and doesn't allow selection to bleed through
3258        assert_eq!(
3259            local_selections[0].range,
3260            DisplayPoint::new(4, 0)..DisplayPoint::new(6, 0)
3261        );
3262        assert_eq!(local_selections[0].head, DisplayPoint::new(5, 0));
3263
3264        // moves cursor on buffer boundary back two lines
3265        // and doesn't allow selection to bleed through
3266        assert_eq!(
3267            local_selections[1].range,
3268            DisplayPoint::new(10, 0)..DisplayPoint::new(11, 0)
3269        );
3270        assert_eq!(local_selections[1].head, DisplayPoint::new(10, 0));
3271    }
3272
3273    #[gpui::test]
3274    fn test_layout_with_placeholder_text_and_blocks(cx: &mut TestAppContext) {
3275        init_test(cx, |_| {});
3276
3277        let editor = cx
3278            .add_window(|cx| {
3279                let buffer = MultiBuffer::build_simple("", cx);
3280                Editor::new(EditorMode::Full, buffer, None, None, cx)
3281            })
3282            .root(cx);
3283
3284        editor.update(cx, |editor, cx| {
3285            editor.set_placeholder_text("hello", cx);
3286            editor.insert_blocks(
3287                [BlockProperties {
3288                    style: BlockStyle::Fixed,
3289                    disposition: BlockDisposition::Above,
3290                    height: 3,
3291                    position: Anchor::min(),
3292                    render: Arc::new(|_| Empty::new().into_any()),
3293                }],
3294                None,
3295                cx,
3296            );
3297
3298            // Blur the editor so that it displays placeholder text.
3299            cx.blur();
3300        });
3301
3302        let mut element = EditorElement::new(editor.read_with(cx, |editor, cx| editor.style(cx)));
3303        let (size, mut state) = editor.update(cx, |editor, cx| {
3304            let mut new_parents = Default::default();
3305            let mut notify_views_if_parents_change = Default::default();
3306            let mut layout_cx = LayoutContext::new(
3307                cx,
3308                &mut new_parents,
3309                &mut notify_views_if_parents_change,
3310                false,
3311            );
3312            element.layout(
3313                SizeConstraint::new(vec2f(500., 500.), vec2f(500., 500.)),
3314                editor,
3315                &mut layout_cx,
3316            )
3317        });
3318
3319        assert_eq!(state.position_map.line_layouts.len(), 4);
3320        assert_eq!(
3321            state
3322                .line_number_layouts
3323                .iter()
3324                .map(Option::is_some)
3325                .collect::<Vec<_>>(),
3326            &[false, false, false, true]
3327        );
3328
3329        // Don't panic.
3330        let mut scene = SceneBuilder::new(1.0);
3331        let bounds = RectF::new(Default::default(), size);
3332        editor.update(cx, |editor, cx| {
3333            element.paint(
3334                &mut scene,
3335                bounds,
3336                bounds,
3337                &mut state,
3338                editor,
3339                &mut PaintContext::new(cx),
3340            );
3341        });
3342    }
3343
3344    #[gpui::test]
3345    fn test_all_invisibles_drawing(cx: &mut TestAppContext) {
3346        const TAB_SIZE: u32 = 4;
3347
3348        let input_text = "\t \t|\t| a b";
3349        let expected_invisibles = vec![
3350            Invisible::Tab {
3351                line_start_offset: 0,
3352            },
3353            Invisible::Whitespace {
3354                line_offset: TAB_SIZE as usize,
3355            },
3356            Invisible::Tab {
3357                line_start_offset: TAB_SIZE as usize + 1,
3358            },
3359            Invisible::Tab {
3360                line_start_offset: TAB_SIZE as usize * 2 + 1,
3361            },
3362            Invisible::Whitespace {
3363                line_offset: TAB_SIZE as usize * 3 + 1,
3364            },
3365            Invisible::Whitespace {
3366                line_offset: TAB_SIZE as usize * 3 + 3,
3367            },
3368        ];
3369        assert_eq!(
3370            expected_invisibles.len(),
3371            input_text
3372                .chars()
3373                .filter(|initial_char| initial_char.is_whitespace())
3374                .count(),
3375            "Hardcoded expected invisibles differ from the actual ones in '{input_text}'"
3376        );
3377
3378        init_test(cx, |s| {
3379            s.defaults.show_whitespaces = Some(ShowWhitespaceSetting::All);
3380            s.defaults.tab_size = NonZeroU32::new(TAB_SIZE);
3381        });
3382
3383        let actual_invisibles =
3384            collect_invisibles_from_new_editor(cx, EditorMode::Full, &input_text, 500.0);
3385
3386        assert_eq!(expected_invisibles, actual_invisibles);
3387    }
3388
3389    #[gpui::test]
3390    fn test_invisibles_dont_appear_in_certain_editors(cx: &mut TestAppContext) {
3391        init_test(cx, |s| {
3392            s.defaults.show_whitespaces = Some(ShowWhitespaceSetting::All);
3393            s.defaults.tab_size = NonZeroU32::new(4);
3394        });
3395
3396        for editor_mode_without_invisibles in [
3397            EditorMode::SingleLine,
3398            EditorMode::AutoHeight { max_lines: 100 },
3399        ] {
3400            let invisibles = collect_invisibles_from_new_editor(
3401                cx,
3402                editor_mode_without_invisibles,
3403                "\t\t\t| | a b",
3404                500.0,
3405            );
3406            assert!(invisibles.is_empty(),
3407                "For editor mode {editor_mode_without_invisibles:?} no invisibles was expected but got {invisibles:?}");
3408        }
3409    }
3410
3411    #[gpui::test]
3412    fn test_wrapped_invisibles_drawing(cx: &mut TestAppContext) {
3413        let tab_size = 4;
3414        let input_text = "a\tbcd   ".repeat(9);
3415        let repeated_invisibles = [
3416            Invisible::Tab {
3417                line_start_offset: 1,
3418            },
3419            Invisible::Whitespace {
3420                line_offset: tab_size as usize + 3,
3421            },
3422            Invisible::Whitespace {
3423                line_offset: tab_size as usize + 4,
3424            },
3425            Invisible::Whitespace {
3426                line_offset: tab_size as usize + 5,
3427            },
3428        ];
3429        let expected_invisibles = std::iter::once(repeated_invisibles)
3430            .cycle()
3431            .take(9)
3432            .flatten()
3433            .collect::<Vec<_>>();
3434        assert_eq!(
3435            expected_invisibles.len(),
3436            input_text
3437                .chars()
3438                .filter(|initial_char| initial_char.is_whitespace())
3439                .count(),
3440            "Hardcoded expected invisibles differ from the actual ones in '{input_text}'"
3441        );
3442        info!("Expected invisibles: {expected_invisibles:?}");
3443
3444        init_test(cx, |_| {});
3445
3446        // Put the same string with repeating whitespace pattern into editors of various size,
3447        // take deliberately small steps during resizing, to put all whitespace kinds near the wrap point.
3448        let resize_step = 10.0;
3449        let mut editor_width = 200.0;
3450        while editor_width <= 1000.0 {
3451            update_test_language_settings(cx, |s| {
3452                s.defaults.tab_size = NonZeroU32::new(tab_size);
3453                s.defaults.show_whitespaces = Some(ShowWhitespaceSetting::All);
3454                s.defaults.preferred_line_length = Some(editor_width as u32);
3455                s.defaults.soft_wrap = Some(language_settings::SoftWrap::PreferredLineLength);
3456            });
3457
3458            let actual_invisibles =
3459                collect_invisibles_from_new_editor(cx, EditorMode::Full, &input_text, editor_width);
3460
3461            // Whatever the editor size is, ensure it has the same invisible kinds in the same order
3462            // (no good guarantees about the offsets: wrapping could trigger padding and its tests should check the offsets).
3463            let mut i = 0;
3464            for (actual_index, actual_invisible) in actual_invisibles.iter().enumerate() {
3465                i = actual_index;
3466                match expected_invisibles.get(i) {
3467                    Some(expected_invisible) => match (expected_invisible, actual_invisible) {
3468                        (Invisible::Whitespace { .. }, Invisible::Whitespace { .. })
3469                        | (Invisible::Tab { .. }, Invisible::Tab { .. }) => {}
3470                        _ => {
3471                            panic!("At index {i}, expected invisible {expected_invisible:?} does not match actual {actual_invisible:?} by kind. Actual invisibles: {actual_invisibles:?}")
3472                        }
3473                    },
3474                    None => panic!("Unexpected extra invisible {actual_invisible:?} at index {i}"),
3475                }
3476            }
3477            let missing_expected_invisibles = &expected_invisibles[i + 1..];
3478            assert!(
3479                missing_expected_invisibles.is_empty(),
3480                "Missing expected invisibles after index {i}: {missing_expected_invisibles:?}"
3481            );
3482
3483            editor_width += resize_step;
3484        }
3485    }
3486
3487    fn collect_invisibles_from_new_editor(
3488        cx: &mut TestAppContext,
3489        editor_mode: EditorMode,
3490        input_text: &str,
3491        editor_width: f32,
3492    ) -> Vec<Invisible> {
3493        info!(
3494            "Creating editor with mode {editor_mode:?}, width {editor_width} and text '{input_text}'"
3495        );
3496        let editor = cx
3497            .add_window(|cx| {
3498                let buffer = MultiBuffer::build_simple(&input_text, cx);
3499                Editor::new(editor_mode, buffer, None, None, cx)
3500            })
3501            .root(cx);
3502
3503        let mut element = EditorElement::new(editor.read_with(cx, |editor, cx| editor.style(cx)));
3504        let (_, layout_state) = editor.update(cx, |editor, cx| {
3505            editor.set_soft_wrap_mode(language_settings::SoftWrap::EditorWidth, cx);
3506            editor.set_wrap_width(Some(editor_width), cx);
3507
3508            let mut new_parents = Default::default();
3509            let mut notify_views_if_parents_change = Default::default();
3510            let mut layout_cx = LayoutContext::new(
3511                cx,
3512                &mut new_parents,
3513                &mut notify_views_if_parents_change,
3514                false,
3515            );
3516            element.layout(
3517                SizeConstraint::new(vec2f(editor_width, 500.), vec2f(editor_width, 500.)),
3518                editor,
3519                &mut layout_cx,
3520            )
3521        });
3522
3523        layout_state
3524            .position_map
3525            .line_layouts
3526            .iter()
3527            .map(|line_with_invisibles| &line_with_invisibles.invisibles)
3528            .flatten()
3529            .cloned()
3530            .collect()
3531    }
3532}