1use super::{
2 display_map::{BlockContext, ToDisplayPoint},
3 Anchor, DisplayPoint, Editor, EditorMode, EditorSnapshot, Scroll, Select, SelectPhase,
4 SoftWrap, ToPoint, MAX_LINE_LEN,
5};
6use crate::{
7 display_map::{BlockStyle, DisplaySnapshot, TransformBlock},
8 hover_popover::{
9 HoverAt, HOVER_POPOVER_GAP, MIN_POPOVER_CHARACTER_WIDTH, MIN_POPOVER_LINE_HEIGHT,
10 },
11 link_go_to_definition::{
12 CmdShiftChanged, GoToFetchedDefinition, GoToFetchedTypeDefinition, UpdateGoToDefinitionLink,
13 },
14 mouse_context_menu::DeployMouseContextMenu,
15 EditorStyle,
16};
17use clock::ReplicaId;
18use collections::{BTreeMap, HashMap};
19use git::diff::{DiffHunk, DiffHunkStatus};
20use gpui::{
21 color::Color,
22 elements::*,
23 fonts::{HighlightStyle, Underline},
24 geometry::{
25 rect::RectF,
26 vector::{vec2f, Vector2F},
27 PathBuilder,
28 },
29 json::{self, ToJson},
30 platform::CursorStyle,
31 text_layout::{self, Line, RunStyle, TextLayoutCache},
32 AppContext, Axis, Border, CursorRegion, Element, ElementBox, Event, EventContext,
33 LayoutContext, ModifiersChangedEvent, MouseButton, MouseButtonEvent, MouseMovedEvent,
34 MouseRegion, MutableAppContext, PaintContext, Quad, Scene, SizeConstraint, ViewContext,
35 WeakViewHandle,
36};
37use json::json;
38use language::{Bias, DiagnosticSeverity, OffsetUtf16, Selection};
39use project::ProjectPath;
40use settings::{GitGutter, Settings};
41use smallvec::SmallVec;
42use std::{
43 cmp::{self, Ordering},
44 fmt::Write,
45 iter,
46 ops::Range,
47 sync::Arc,
48};
49use theme::DiffStyle;
50
51struct SelectionLayout {
52 head: DisplayPoint,
53 range: Range<DisplayPoint>,
54}
55
56impl SelectionLayout {
57 fn new<T: ToPoint + ToDisplayPoint + Clone>(
58 selection: Selection<T>,
59 line_mode: bool,
60 map: &DisplaySnapshot,
61 ) -> Self {
62 if line_mode {
63 let selection = selection.map(|p| p.to_point(&map.buffer_snapshot));
64 let point_range = map.expand_to_line(selection.range());
65 Self {
66 head: selection.head().to_display_point(map),
67 range: point_range.start.to_display_point(map)
68 ..point_range.end.to_display_point(map),
69 }
70 } else {
71 let selection = selection.map(|p| p.to_display_point(map));
72 Self {
73 head: selection.head(),
74 range: selection.range(),
75 }
76 }
77 }
78}
79
80#[derive(Clone)]
81pub struct EditorElement {
82 view: WeakViewHandle<Editor>,
83 style: Arc<EditorStyle>,
84 cursor_shape: CursorShape,
85}
86
87impl EditorElement {
88 pub fn new(
89 view: WeakViewHandle<Editor>,
90 style: EditorStyle,
91 cursor_shape: CursorShape,
92 ) -> Self {
93 Self {
94 view,
95 style: Arc::new(style),
96 cursor_shape,
97 }
98 }
99
100 fn view<'a>(&self, cx: &'a AppContext) -> &'a Editor {
101 self.view.upgrade(cx).unwrap().read(cx)
102 }
103
104 fn update_view<F, T>(&self, cx: &mut MutableAppContext, f: F) -> T
105 where
106 F: FnOnce(&mut Editor, &mut ViewContext<Editor>) -> T,
107 {
108 self.view.upgrade(cx).unwrap().update(cx, f)
109 }
110
111 fn snapshot(&self, cx: &mut MutableAppContext) -> EditorSnapshot {
112 self.update_view(cx, |view, cx| view.snapshot(cx))
113 }
114
115 fn attach_mouse_handlers(
116 view: &WeakViewHandle<Editor>,
117 position_map: &Arc<PositionMap>,
118 visible_bounds: RectF,
119 text_bounds: RectF,
120 gutter_bounds: RectF,
121 bounds: RectF,
122 cx: &mut PaintContext,
123 ) {
124 enum EditorElementMouseHandlers {}
125 cx.scene.push_mouse_region(
126 MouseRegion::new::<EditorElementMouseHandlers>(view.id(), view.id(), visible_bounds)
127 .on_down(MouseButton::Left, {
128 let position_map = position_map.clone();
129 move |e, cx| {
130 if !Self::mouse_down(
131 e.platform_event,
132 position_map.as_ref(),
133 text_bounds,
134 gutter_bounds,
135 cx,
136 ) {
137 cx.propogate_event();
138 }
139 }
140 })
141 .on_down(MouseButton::Right, {
142 let position_map = position_map.clone();
143 move |e, cx| {
144 if !Self::mouse_right_down(
145 e.position,
146 position_map.as_ref(),
147 text_bounds,
148 cx,
149 ) {
150 cx.propogate_event();
151 }
152 }
153 })
154 .on_up(MouseButton::Left, {
155 let view = view.clone();
156 let position_map = position_map.clone();
157 move |e, cx| {
158 if !Self::mouse_up(
159 view.clone(),
160 e.position,
161 e.cmd,
162 e.shift,
163 position_map.as_ref(),
164 text_bounds,
165 cx,
166 ) {
167 cx.propogate_event()
168 }
169 }
170 })
171 .on_drag(MouseButton::Left, {
172 let view = view.clone();
173 let position_map = position_map.clone();
174 move |e, cx| {
175 if !Self::mouse_dragged(
176 view.clone(),
177 e.platform_event,
178 position_map.as_ref(),
179 text_bounds,
180 cx,
181 ) {
182 cx.propogate_event()
183 }
184 }
185 })
186 .on_move({
187 let position_map = position_map.clone();
188 move |e, cx| {
189 if !Self::mouse_moved(e.platform_event, &position_map, text_bounds, cx) {
190 cx.propogate_event()
191 }
192 }
193 })
194 .on_scroll({
195 let position_map = position_map.clone();
196 move |e, cx| {
197 if !Self::scroll(e.position, e.delta, e.precise, &position_map, bounds, cx)
198 {
199 cx.propogate_event()
200 }
201 }
202 }),
203 );
204 }
205
206 fn mouse_down(
207 MouseButtonEvent {
208 position,
209 ctrl,
210 alt,
211 shift,
212 cmd,
213 mut click_count,
214 ..
215 }: MouseButtonEvent,
216 position_map: &PositionMap,
217 text_bounds: RectF,
218 gutter_bounds: RectF,
219 cx: &mut EventContext,
220 ) -> bool {
221 if gutter_bounds.contains_point(position) {
222 click_count = 3; // Simulate triple-click when clicking the gutter to select lines
223 } else if !text_bounds.contains_point(position) {
224 return false;
225 }
226
227 let (position, target_position) = position_map.point_for_position(text_bounds, position);
228
229 if shift && alt {
230 cx.dispatch_action(Select(SelectPhase::BeginColumnar {
231 position,
232 goal_column: target_position.column(),
233 }));
234 } else if shift && !ctrl && !alt && !cmd {
235 cx.dispatch_action(Select(SelectPhase::Extend {
236 position,
237 click_count,
238 }));
239 } else {
240 cx.dispatch_action(Select(SelectPhase::Begin {
241 position,
242 add: alt,
243 click_count,
244 }));
245 }
246
247 true
248 }
249
250 fn mouse_right_down(
251 position: Vector2F,
252 position_map: &PositionMap,
253 text_bounds: RectF,
254 cx: &mut EventContext,
255 ) -> bool {
256 if !text_bounds.contains_point(position) {
257 return false;
258 }
259
260 let (point, _) = position_map.point_for_position(text_bounds, position);
261
262 cx.dispatch_action(DeployMouseContextMenu { position, point });
263 true
264 }
265
266 fn mouse_up(
267 view: WeakViewHandle<Editor>,
268 position: Vector2F,
269 cmd: bool,
270 shift: bool,
271 position_map: &PositionMap,
272 text_bounds: RectF,
273 cx: &mut EventContext,
274 ) -> bool {
275 let view = view.upgrade(cx.app).unwrap().read(cx.app);
276 let end_selection = view.has_pending_selection();
277 let pending_nonempty_selections = view.has_pending_nonempty_selection();
278
279 if end_selection {
280 cx.dispatch_action(Select(SelectPhase::End));
281 }
282
283 if !pending_nonempty_selections && cmd && text_bounds.contains_point(position) {
284 let (point, target_point) = position_map.point_for_position(text_bounds, position);
285
286 if point == target_point {
287 if shift {
288 cx.dispatch_action(GoToFetchedTypeDefinition { point });
289 } else {
290 cx.dispatch_action(GoToFetchedDefinition { point });
291 }
292
293 return true;
294 }
295 }
296
297 end_selection
298 }
299
300 fn mouse_dragged(
301 view: WeakViewHandle<Editor>,
302 MouseMovedEvent {
303 cmd,
304 shift,
305 position,
306 ..
307 }: MouseMovedEvent,
308 position_map: &PositionMap,
309 text_bounds: RectF,
310 cx: &mut EventContext,
311 ) -> bool {
312 // This will be handled more correctly once https://github.com/zed-industries/zed/issues/1218 is completed
313 // Don't trigger hover popover if mouse is hovering over context menu
314 let point = if text_bounds.contains_point(position) {
315 let (point, target_point) = position_map.point_for_position(text_bounds, position);
316 if point == target_point {
317 Some(point)
318 } else {
319 None
320 }
321 } else {
322 None
323 };
324
325 cx.dispatch_action(UpdateGoToDefinitionLink {
326 point,
327 cmd_held: cmd,
328 shift_held: shift,
329 });
330
331 let view = view.upgrade(cx.app).unwrap().read(cx.app);
332 if view.has_pending_selection() {
333 let mut scroll_delta = Vector2F::zero();
334
335 let vertical_margin = position_map.line_height.min(text_bounds.height() / 3.0);
336 let top = text_bounds.origin_y() + vertical_margin;
337 let bottom = text_bounds.lower_left().y() - vertical_margin;
338 if position.y() < top {
339 scroll_delta.set_y(-scale_vertical_mouse_autoscroll_delta(top - position.y()))
340 }
341 if position.y() > bottom {
342 scroll_delta.set_y(scale_vertical_mouse_autoscroll_delta(position.y() - bottom))
343 }
344
345 let horizontal_margin = position_map.line_height.min(text_bounds.width() / 3.0);
346 let left = text_bounds.origin_x() + horizontal_margin;
347 let right = text_bounds.upper_right().x() - horizontal_margin;
348 if position.x() < left {
349 scroll_delta.set_x(-scale_horizontal_mouse_autoscroll_delta(
350 left - position.x(),
351 ))
352 }
353 if position.x() > right {
354 scroll_delta.set_x(scale_horizontal_mouse_autoscroll_delta(
355 position.x() - right,
356 ))
357 }
358
359 let (position, target_position) =
360 position_map.point_for_position(text_bounds, position);
361
362 cx.dispatch_action(Select(SelectPhase::Update {
363 position,
364 goal_column: target_position.column(),
365 scroll_position: (position_map.snapshot.scroll_position() + scroll_delta)
366 .clamp(Vector2F::zero(), position_map.scroll_max),
367 }));
368
369 cx.dispatch_action(HoverAt { point });
370 true
371 } else {
372 cx.dispatch_action(HoverAt { point });
373 false
374 }
375 }
376
377 fn mouse_moved(
378 MouseMovedEvent {
379 cmd,
380 shift,
381 position,
382 ..
383 }: MouseMovedEvent,
384 position_map: &PositionMap,
385 text_bounds: RectF,
386 cx: &mut EventContext,
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 let (point, target_point) = position_map.point_for_position(text_bounds, position);
392 if point == target_point {
393 Some(point)
394 } else {
395 None
396 }
397 } else {
398 None
399 };
400
401 cx.dispatch_action(UpdateGoToDefinitionLink {
402 point,
403 cmd_held: cmd,
404 shift_held: shift,
405 });
406
407 cx.dispatch_action(HoverAt { point });
408 true
409 }
410
411 fn modifiers_changed(&self, event: ModifiersChangedEvent, cx: &mut EventContext) -> bool {
412 cx.dispatch_action(CmdShiftChanged {
413 cmd_down: event.cmd,
414 shift_down: event.shift,
415 });
416 false
417 }
418
419 fn scroll(
420 position: Vector2F,
421 mut delta: Vector2F,
422 precise: bool,
423 position_map: &PositionMap,
424 bounds: RectF,
425 cx: &mut EventContext,
426 ) -> bool {
427 if !bounds.contains_point(position) {
428 return false;
429 }
430
431 let max_glyph_width = position_map.em_width;
432 if !precise {
433 delta *= vec2f(max_glyph_width, position_map.line_height);
434 }
435
436 let scroll_position = position_map.snapshot.scroll_position();
437 let x = (scroll_position.x() * max_glyph_width - delta.x()) / max_glyph_width;
438 let y =
439 (scroll_position.y() * position_map.line_height - delta.y()) / position_map.line_height;
440 let scroll_position = vec2f(x, y).clamp(Vector2F::zero(), position_map.scroll_max);
441
442 cx.dispatch_action(Scroll(scroll_position));
443
444 true
445 }
446
447 fn paint_background(
448 &self,
449 gutter_bounds: RectF,
450 text_bounds: RectF,
451 layout: &LayoutState,
452 cx: &mut PaintContext,
453 ) {
454 let bounds = gutter_bounds.union_rect(text_bounds);
455 let scroll_top =
456 layout.position_map.snapshot.scroll_position().y() * layout.position_map.line_height;
457 let editor = self.view(cx.app);
458 cx.scene.push_quad(Quad {
459 bounds: gutter_bounds,
460 background: Some(self.style.gutter_background),
461 border: Border::new(0., Color::transparent_black()),
462 corner_radius: 0.,
463 });
464 cx.scene.push_quad(Quad {
465 bounds: text_bounds,
466 background: Some(self.style.background),
467 border: Border::new(0., Color::transparent_black()),
468 corner_radius: 0.,
469 });
470
471 if let EditorMode::Full = editor.mode {
472 let mut active_rows = layout.active_rows.iter().peekable();
473 while let Some((start_row, contains_non_empty_selection)) = active_rows.next() {
474 let mut end_row = *start_row;
475 while active_rows.peek().map_or(false, |r| {
476 *r.0 == end_row + 1 && r.1 == contains_non_empty_selection
477 }) {
478 active_rows.next().unwrap();
479 end_row += 1;
480 }
481
482 if !contains_non_empty_selection {
483 let origin = vec2f(
484 bounds.origin_x(),
485 bounds.origin_y() + (layout.position_map.line_height * *start_row as f32)
486 - scroll_top,
487 );
488 let size = vec2f(
489 bounds.width(),
490 layout.position_map.line_height * (end_row - start_row + 1) as f32,
491 );
492 cx.scene.push_quad(Quad {
493 bounds: RectF::new(origin, size),
494 background: Some(self.style.active_line_background),
495 border: Border::default(),
496 corner_radius: 0.,
497 });
498 }
499 }
500
501 if let Some(highlighted_rows) = &layout.highlighted_rows {
502 let origin = vec2f(
503 bounds.origin_x(),
504 bounds.origin_y()
505 + (layout.position_map.line_height * highlighted_rows.start as f32)
506 - scroll_top,
507 );
508 let size = vec2f(
509 bounds.width(),
510 layout.position_map.line_height * highlighted_rows.len() as f32,
511 );
512 cx.scene.push_quad(Quad {
513 bounds: RectF::new(origin, size),
514 background: Some(self.style.highlighted_line_background),
515 border: Border::default(),
516 corner_radius: 0.,
517 });
518 }
519 }
520 }
521
522 fn paint_gutter(
523 &mut self,
524 bounds: RectF,
525 visible_bounds: RectF,
526 layout: &mut LayoutState,
527 cx: &mut PaintContext,
528 ) {
529 struct GutterLayout {
530 line_height: f32,
531 // scroll_position: Vector2F,
532 scroll_top: f32,
533 bounds: RectF,
534 }
535
536 struct DiffLayout<'a> {
537 buffer_row: u32,
538 last_diff: Option<&'a DiffHunk<u32>>,
539 }
540
541 fn diff_quad(
542 hunk: &DiffHunk<u32>,
543 gutter_layout: &GutterLayout,
544 diff_style: &DiffStyle,
545 ) -> Quad {
546 let color = match hunk.status() {
547 DiffHunkStatus::Added => diff_style.inserted,
548 DiffHunkStatus::Modified => diff_style.modified,
549
550 //TODO: This rendering is entirely a horrible hack
551 DiffHunkStatus::Removed => {
552 let row = hunk.buffer_range.start;
553
554 let offset = gutter_layout.line_height / 2.;
555 let start_y =
556 row as f32 * gutter_layout.line_height + offset - gutter_layout.scroll_top;
557 let end_y = start_y + gutter_layout.line_height;
558
559 let width = diff_style.removed_width_em * gutter_layout.line_height;
560 let highlight_origin = gutter_layout.bounds.origin() + vec2f(-width, start_y);
561 let highlight_size = vec2f(width * 2., end_y - start_y);
562 let highlight_bounds = RectF::new(highlight_origin, highlight_size);
563
564 return Quad {
565 bounds: highlight_bounds,
566 background: Some(diff_style.deleted),
567 border: Border::new(0., Color::transparent_black()),
568 corner_radius: 1. * gutter_layout.line_height,
569 };
570 }
571 };
572
573 let start_row = hunk.buffer_range.start;
574 let end_row = hunk.buffer_range.end;
575
576 let start_y = start_row as f32 * gutter_layout.line_height - gutter_layout.scroll_top;
577 let end_y = end_row as f32 * gutter_layout.line_height - gutter_layout.scroll_top;
578
579 let width = diff_style.width_em * gutter_layout.line_height;
580 let highlight_origin = gutter_layout.bounds.origin() + vec2f(-width, start_y);
581 let highlight_size = vec2f(width * 2., end_y - start_y);
582 let highlight_bounds = RectF::new(highlight_origin, highlight_size);
583
584 Quad {
585 bounds: highlight_bounds,
586 background: Some(color),
587 border: Border::new(0., Color::transparent_black()),
588 corner_radius: diff_style.corner_radius * gutter_layout.line_height,
589 }
590 }
591
592 let scroll_position = layout.position_map.snapshot.scroll_position();
593 let gutter_layout = {
594 let line_height = layout.position_map.line_height;
595 GutterLayout {
596 scroll_top: scroll_position.y() * line_height,
597 line_height,
598 bounds,
599 }
600 };
601
602 let mut diff_layout = DiffLayout {
603 buffer_row: scroll_position.y() as u32,
604 last_diff: None,
605 };
606
607 let diff_style = &cx.global::<Settings>().theme.editor.diff.clone();
608 let show_gutter = matches!(
609 &cx.global::<Settings>()
610 .git_overrides
611 .git_gutter
612 .unwrap_or_default(),
613 GitGutter::TrackedFiles
614 );
615
616 // line is `None` when there's a line wrap
617 for (ix, line) in layout.line_number_layouts.iter().enumerate() {
618 if let Some(line) = line {
619 let line_origin = bounds.origin()
620 + vec2f(
621 bounds.width() - line.width() - layout.gutter_padding,
622 ix as f32 * gutter_layout.line_height
623 - (gutter_layout.scroll_top % gutter_layout.line_height),
624 );
625
626 line.paint(line_origin, visible_bounds, gutter_layout.line_height, cx);
627
628 if show_gutter {
629 //This line starts a buffer line, so let's do the diff calculation
630 let new_hunk = get_hunk(diff_layout.buffer_row, &layout.diff_hunks);
631
632 let (is_ending, is_starting) = match (diff_layout.last_diff, new_hunk) {
633 (Some(old_hunk), Some(new_hunk)) if new_hunk == old_hunk => (false, false),
634 (a, b) => (a.is_some(), b.is_some()),
635 };
636
637 if is_ending {
638 let last_hunk = diff_layout.last_diff.take().unwrap();
639 cx.scene
640 .push_quad(diff_quad(last_hunk, &gutter_layout, diff_style));
641 }
642
643 if is_starting {
644 let new_hunk = new_hunk.unwrap();
645 diff_layout.last_diff = Some(new_hunk);
646 };
647
648 diff_layout.buffer_row += 1;
649 }
650 }
651 }
652
653 // If we ran out with a diff hunk still being prepped, paint it now
654 if let Some(last_hunk) = diff_layout.last_diff {
655 cx.scene
656 .push_quad(diff_quad(last_hunk, &gutter_layout, diff_style))
657 }
658
659 if let Some((row, indicator)) = layout.code_actions_indicator.as_mut() {
660 let mut x = bounds.width() - layout.gutter_padding;
661 let mut y = *row as f32 * gutter_layout.line_height - gutter_layout.scroll_top;
662 x += ((layout.gutter_padding + layout.gutter_margin) - indicator.size().x()) / 2.;
663 y += (gutter_layout.line_height - indicator.size().y()) / 2.;
664 indicator.paint(bounds.origin() + vec2f(x, y), visible_bounds, cx);
665 }
666 }
667
668 fn paint_text(
669 &mut self,
670 bounds: RectF,
671 visible_bounds: RectF,
672 layout: &mut LayoutState,
673 cx: &mut PaintContext,
674 ) {
675 let view = self.view(cx.app);
676 let style = &self.style;
677 let local_replica_id = view.replica_id(cx);
678 let scroll_position = layout.position_map.snapshot.scroll_position();
679 let start_row = scroll_position.y() as u32;
680 let scroll_top = scroll_position.y() * layout.position_map.line_height;
681 let end_row =
682 ((scroll_top + bounds.height()) / layout.position_map.line_height).ceil() as u32 + 1; // Add 1 to ensure selections bleed off screen
683 let max_glyph_width = layout.position_map.em_width;
684 let scroll_left = scroll_position.x() * max_glyph_width;
685 let content_origin = bounds.origin() + vec2f(layout.gutter_margin, 0.);
686
687 cx.scene.push_layer(Some(bounds));
688
689 cx.scene.push_cursor_region(CursorRegion {
690 bounds,
691 style: if !view.link_go_to_definition_state.definitions.is_empty() {
692 CursorStyle::PointingHand
693 } else {
694 CursorStyle::IBeam
695 },
696 });
697
698 for (range, color) in &layout.highlighted_ranges {
699 self.paint_highlighted_range(
700 range.clone(),
701 start_row,
702 end_row,
703 *color,
704 0.,
705 0.15 * layout.position_map.line_height,
706 layout,
707 content_origin,
708 scroll_top,
709 scroll_left,
710 bounds,
711 cx,
712 );
713 }
714
715 let mut cursors = SmallVec::<[Cursor; 32]>::new();
716 for (replica_id, selections) in &layout.selections {
717 let selection_style = style.replica_selection_style(*replica_id);
718 let corner_radius = 0.15 * layout.position_map.line_height;
719
720 for selection in selections {
721 self.paint_highlighted_range(
722 selection.range.clone(),
723 start_row,
724 end_row,
725 selection_style.selection,
726 corner_radius,
727 corner_radius * 2.,
728 layout,
729 content_origin,
730 scroll_top,
731 scroll_left,
732 bounds,
733 cx,
734 );
735
736 if view.show_local_cursors() || *replica_id != local_replica_id {
737 let cursor_position = selection.head;
738 if (start_row..end_row).contains(&cursor_position.row()) {
739 let cursor_row_layout = &layout.position_map.line_layouts
740 [(cursor_position.row() - start_row) as usize];
741 let cursor_column = cursor_position.column() as usize;
742
743 let cursor_character_x = cursor_row_layout.x_for_index(cursor_column);
744 let mut block_width =
745 cursor_row_layout.x_for_index(cursor_column + 1) - cursor_character_x;
746 if block_width == 0.0 {
747 block_width = layout.position_map.em_width;
748 }
749 let block_text = if let CursorShape::Block = self.cursor_shape {
750 layout
751 .position_map
752 .snapshot
753 .chars_at(cursor_position)
754 .next()
755 .and_then(|character| {
756 let font_id =
757 cursor_row_layout.font_for_index(cursor_column)?;
758 let text = character.to_string();
759
760 Some(cx.text_layout_cache.layout_str(
761 &text,
762 cursor_row_layout.font_size(),
763 &[(
764 text.len(),
765 RunStyle {
766 font_id,
767 color: style.background,
768 underline: Default::default(),
769 },
770 )],
771 ))
772 })
773 } else {
774 None
775 };
776
777 let x = cursor_character_x - scroll_left;
778 let y = cursor_position.row() as f32 * layout.position_map.line_height
779 - scroll_top;
780 cursors.push(Cursor {
781 color: selection_style.cursor,
782 block_width,
783 origin: vec2f(x, y),
784 line_height: layout.position_map.line_height,
785 shape: self.cursor_shape,
786 block_text,
787 });
788 }
789 }
790 }
791 }
792
793 if let Some(visible_text_bounds) = bounds.intersection(visible_bounds) {
794 // Draw glyphs
795 for (ix, line) in layout.position_map.line_layouts.iter().enumerate() {
796 let row = start_row + ix as u32;
797 line.paint(
798 content_origin
799 + vec2f(
800 -scroll_left,
801 row as f32 * layout.position_map.line_height - scroll_top,
802 ),
803 visible_text_bounds,
804 layout.position_map.line_height,
805 cx,
806 );
807 }
808 }
809
810 cx.scene.push_layer(Some(bounds));
811 for cursor in cursors {
812 cursor.paint(content_origin, cx);
813 }
814 cx.scene.pop_layer();
815
816 if let Some((position, context_menu)) = layout.context_menu.as_mut() {
817 cx.scene.push_stacking_context(None);
818 let cursor_row_layout =
819 &layout.position_map.line_layouts[(position.row() - start_row) as usize];
820 let x = cursor_row_layout.x_for_index(position.column() as usize) - scroll_left;
821 let y = (position.row() + 1) as f32 * layout.position_map.line_height - scroll_top;
822 let mut list_origin = content_origin + vec2f(x, y);
823 let list_width = context_menu.size().x();
824 let list_height = context_menu.size().y();
825
826 // Snap the right edge of the list to the right edge of the window if
827 // its horizontal bounds overflow.
828 if list_origin.x() + list_width > cx.window_size.x() {
829 list_origin.set_x((cx.window_size.x() - list_width).max(0.));
830 }
831
832 if list_origin.y() + list_height > bounds.max_y() {
833 list_origin.set_y(list_origin.y() - layout.position_map.line_height - list_height);
834 }
835
836 context_menu.paint(
837 list_origin,
838 RectF::from_points(Vector2F::zero(), vec2f(f32::MAX, f32::MAX)), // Let content bleed outside of editor
839 cx,
840 );
841
842 cx.scene.pop_stacking_context();
843 }
844
845 if let Some((position, hover_popovers)) = layout.hover_popovers.as_mut() {
846 cx.scene.push_stacking_context(None);
847
848 // This is safe because we check on layout whether the required row is available
849 let hovered_row_layout =
850 &layout.position_map.line_layouts[(position.row() - start_row) as usize];
851
852 // Minimum required size: Take the first popover, and add 1.5 times the minimum popover
853 // height. This is the size we will use to decide whether to render popovers above or below
854 // the hovered line.
855 let first_size = hover_popovers[0].size();
856 let height_to_reserve = first_size.y()
857 + 1.5 * MIN_POPOVER_LINE_HEIGHT as f32 * layout.position_map.line_height;
858
859 // Compute Hovered Point
860 let x = hovered_row_layout.x_for_index(position.column() as usize) - scroll_left;
861 let y = position.row() as f32 * layout.position_map.line_height - scroll_top;
862 let hovered_point = content_origin + vec2f(x, y);
863
864 if hovered_point.y() - height_to_reserve > 0.0 {
865 // There is enough space above. Render popovers above the hovered point
866 let mut current_y = hovered_point.y();
867 for hover_popover in hover_popovers {
868 let size = hover_popover.size();
869 let mut popover_origin = vec2f(hovered_point.x(), current_y - size.y());
870
871 let x_out_of_bounds = bounds.max_x() - (popover_origin.x() + size.x());
872 if x_out_of_bounds < 0.0 {
873 popover_origin.set_x(popover_origin.x() + x_out_of_bounds);
874 }
875
876 hover_popover.paint(
877 popover_origin,
878 RectF::from_points(Vector2F::zero(), vec2f(f32::MAX, f32::MAX)), // Let content bleed outside of editor
879 cx,
880 );
881
882 current_y = popover_origin.y() - HOVER_POPOVER_GAP;
883 }
884 } else {
885 // There is not enough space above. Render popovers below the hovered point
886 let mut current_y = hovered_point.y() + layout.position_map.line_height;
887 for hover_popover in hover_popovers {
888 let size = hover_popover.size();
889 let mut popover_origin = vec2f(hovered_point.x(), current_y);
890
891 let x_out_of_bounds = bounds.max_x() - (popover_origin.x() + size.x());
892 if x_out_of_bounds < 0.0 {
893 popover_origin.set_x(popover_origin.x() + x_out_of_bounds);
894 }
895
896 hover_popover.paint(
897 popover_origin,
898 RectF::from_points(Vector2F::zero(), vec2f(f32::MAX, f32::MAX)), // Let content bleed outside of editor
899 cx,
900 );
901
902 current_y = popover_origin.y() + size.y() + HOVER_POPOVER_GAP;
903 }
904 }
905
906 cx.scene.pop_stacking_context();
907 }
908
909 cx.scene.pop_layer();
910 }
911
912 #[allow(clippy::too_many_arguments)]
913 fn paint_highlighted_range(
914 &self,
915 range: Range<DisplayPoint>,
916 start_row: u32,
917 end_row: u32,
918 color: Color,
919 corner_radius: f32,
920 line_end_overshoot: f32,
921 layout: &LayoutState,
922 content_origin: Vector2F,
923 scroll_top: f32,
924 scroll_left: f32,
925 bounds: RectF,
926 cx: &mut PaintContext,
927 ) {
928 if range.start != range.end {
929 let row_range = if range.end.column() == 0 {
930 cmp::max(range.start.row(), start_row)..cmp::min(range.end.row(), end_row)
931 } else {
932 cmp::max(range.start.row(), start_row)..cmp::min(range.end.row() + 1, end_row)
933 };
934
935 let highlighted_range = HighlightedRange {
936 color,
937 line_height: layout.position_map.line_height,
938 corner_radius,
939 start_y: content_origin.y()
940 + row_range.start as f32 * layout.position_map.line_height
941 - scroll_top,
942 lines: row_range
943 .into_iter()
944 .map(|row| {
945 let line_layout =
946 &layout.position_map.line_layouts[(row - start_row) as usize];
947 HighlightedRangeLine {
948 start_x: if row == range.start.row() {
949 content_origin.x()
950 + line_layout.x_for_index(range.start.column() as usize)
951 - scroll_left
952 } else {
953 content_origin.x() - scroll_left
954 },
955 end_x: if row == range.end.row() {
956 content_origin.x()
957 + line_layout.x_for_index(range.end.column() as usize)
958 - scroll_left
959 } else {
960 content_origin.x() + line_layout.width() + line_end_overshoot
961 - scroll_left
962 },
963 }
964 })
965 .collect(),
966 };
967
968 highlighted_range.paint(bounds, cx.scene);
969 }
970 }
971
972 fn paint_blocks(
973 &mut self,
974 bounds: RectF,
975 visible_bounds: RectF,
976 layout: &mut LayoutState,
977 cx: &mut PaintContext,
978 ) {
979 let scroll_position = layout.position_map.snapshot.scroll_position();
980 let scroll_left = scroll_position.x() * layout.position_map.em_width;
981 let scroll_top = scroll_position.y() * layout.position_map.line_height;
982
983 for block in &mut layout.blocks {
984 let mut origin = bounds.origin()
985 + vec2f(
986 0.,
987 block.row as f32 * layout.position_map.line_height - scroll_top,
988 );
989 if !matches!(block.style, BlockStyle::Sticky) {
990 origin += vec2f(-scroll_left, 0.);
991 }
992 block.element.paint(origin, visible_bounds, cx);
993 }
994 }
995
996 fn max_line_number_width(&self, snapshot: &EditorSnapshot, cx: &LayoutContext) -> f32 {
997 let digit_count = (snapshot.max_buffer_row() as f32).log10().floor() as usize + 1;
998 let style = &self.style;
999
1000 cx.text_layout_cache
1001 .layout_str(
1002 "1".repeat(digit_count).as_str(),
1003 style.text.font_size,
1004 &[(
1005 digit_count,
1006 RunStyle {
1007 font_id: style.text.font_id,
1008 color: Color::black(),
1009 underline: Default::default(),
1010 },
1011 )],
1012 )
1013 .width()
1014 }
1015
1016 fn layout_line_numbers(
1017 &self,
1018 rows: Range<u32>,
1019 active_rows: &BTreeMap<u32, bool>,
1020 snapshot: &EditorSnapshot,
1021 cx: &LayoutContext,
1022 ) -> Vec<Option<text_layout::Line>> {
1023 let style = &self.style;
1024 let include_line_numbers = snapshot.mode == EditorMode::Full;
1025 let mut line_number_layouts = Vec::with_capacity(rows.len());
1026 let mut line_number = String::new();
1027 for (ix, row) in snapshot
1028 .buffer_rows(rows.start)
1029 .take((rows.end - rows.start) as usize)
1030 .enumerate()
1031 {
1032 let display_row = rows.start + ix as u32;
1033 let color = if active_rows.contains_key(&display_row) {
1034 style.line_number_active
1035 } else {
1036 style.line_number
1037 };
1038 if let Some(buffer_row) = row {
1039 if include_line_numbers {
1040 line_number.clear();
1041 write!(&mut line_number, "{}", buffer_row + 1).unwrap();
1042 line_number_layouts.push(Some(cx.text_layout_cache.layout_str(
1043 &line_number,
1044 style.text.font_size,
1045 &[(
1046 line_number.len(),
1047 RunStyle {
1048 font_id: style.text.font_id,
1049 color,
1050 underline: Default::default(),
1051 },
1052 )],
1053 )));
1054 }
1055 } else {
1056 line_number_layouts.push(None);
1057 }
1058 }
1059
1060 line_number_layouts
1061 }
1062
1063 fn layout_lines(
1064 &mut self,
1065 rows: Range<u32>,
1066 snapshot: &EditorSnapshot,
1067 cx: &LayoutContext,
1068 ) -> Vec<text_layout::Line> {
1069 if rows.start >= rows.end {
1070 return Vec::new();
1071 }
1072
1073 // When the editor is empty and unfocused, then show the placeholder.
1074 if snapshot.is_empty() && !snapshot.is_focused() {
1075 let placeholder_style = self
1076 .style
1077 .placeholder_text
1078 .as_ref()
1079 .unwrap_or(&self.style.text);
1080 let placeholder_text = snapshot.placeholder_text();
1081 let placeholder_lines = placeholder_text
1082 .as_ref()
1083 .map_or("", AsRef::as_ref)
1084 .split('\n')
1085 .skip(rows.start as usize)
1086 .chain(iter::repeat(""))
1087 .take(rows.len());
1088 placeholder_lines
1089 .map(|line| {
1090 cx.text_layout_cache.layout_str(
1091 line,
1092 placeholder_style.font_size,
1093 &[(
1094 line.len(),
1095 RunStyle {
1096 font_id: placeholder_style.font_id,
1097 color: placeholder_style.color,
1098 underline: Default::default(),
1099 },
1100 )],
1101 )
1102 })
1103 .collect()
1104 } else {
1105 let style = &self.style;
1106 let chunks = snapshot.chunks(rows.clone(), true).map(|chunk| {
1107 let mut highlight_style = chunk
1108 .syntax_highlight_id
1109 .and_then(|id| id.style(&style.syntax));
1110
1111 if let Some(chunk_highlight) = chunk.highlight_style {
1112 if let Some(highlight_style) = highlight_style.as_mut() {
1113 highlight_style.highlight(chunk_highlight);
1114 } else {
1115 highlight_style = Some(chunk_highlight);
1116 }
1117 }
1118
1119 let mut diagnostic_highlight = HighlightStyle::default();
1120
1121 if chunk.is_unnecessary {
1122 diagnostic_highlight.fade_out = Some(style.unnecessary_code_fade);
1123 }
1124
1125 if let Some(severity) = chunk.diagnostic_severity {
1126 // Omit underlines for HINT/INFO diagnostics on 'unnecessary' code.
1127 if severity <= DiagnosticSeverity::WARNING || !chunk.is_unnecessary {
1128 let diagnostic_style = super::diagnostic_style(severity, true, style);
1129 diagnostic_highlight.underline = Some(Underline {
1130 color: Some(diagnostic_style.message.text.color),
1131 thickness: 1.0.into(),
1132 squiggly: true,
1133 });
1134 }
1135 }
1136
1137 if let Some(highlight_style) = highlight_style.as_mut() {
1138 highlight_style.highlight(diagnostic_highlight);
1139 } else {
1140 highlight_style = Some(diagnostic_highlight);
1141 }
1142
1143 (chunk.text, highlight_style)
1144 });
1145 layout_highlighted_chunks(
1146 chunks,
1147 &style.text,
1148 cx.text_layout_cache,
1149 cx.font_cache,
1150 MAX_LINE_LEN,
1151 rows.len() as usize,
1152 )
1153 }
1154 }
1155
1156 #[allow(clippy::too_many_arguments)]
1157 fn layout_blocks(
1158 &mut self,
1159 rows: Range<u32>,
1160 snapshot: &EditorSnapshot,
1161 editor_width: f32,
1162 scroll_width: f32,
1163 gutter_padding: f32,
1164 gutter_width: f32,
1165 em_width: f32,
1166 text_x: f32,
1167 line_height: f32,
1168 style: &EditorStyle,
1169 line_layouts: &[text_layout::Line],
1170 cx: &mut LayoutContext,
1171 ) -> (f32, Vec<BlockLayout>) {
1172 let editor = if let Some(editor) = self.view.upgrade(cx) {
1173 editor
1174 } else {
1175 return Default::default();
1176 };
1177
1178 let tooltip_style = cx.global::<Settings>().theme.tooltip.clone();
1179 let scroll_x = snapshot.scroll_position.x();
1180 let (fixed_blocks, non_fixed_blocks) = snapshot
1181 .blocks_in_range(rows.clone())
1182 .partition::<Vec<_>, _>(|(_, block)| match block {
1183 TransformBlock::ExcerptHeader { .. } => false,
1184 TransformBlock::Custom(block) => block.style() == BlockStyle::Fixed,
1185 });
1186 let mut render_block = |block: &TransformBlock, width: f32| {
1187 let mut element = match block {
1188 TransformBlock::Custom(block) => {
1189 let align_to = block
1190 .position()
1191 .to_point(&snapshot.buffer_snapshot)
1192 .to_display_point(snapshot);
1193 let anchor_x = text_x
1194 + if rows.contains(&align_to.row()) {
1195 line_layouts[(align_to.row() - rows.start) as usize]
1196 .x_for_index(align_to.column() as usize)
1197 } else {
1198 layout_line(align_to.row(), snapshot, style, cx.text_layout_cache)
1199 .x_for_index(align_to.column() as usize)
1200 };
1201
1202 cx.render(&editor, |_, cx| {
1203 block.render(&mut BlockContext {
1204 cx,
1205 anchor_x,
1206 gutter_padding,
1207 line_height,
1208 scroll_x,
1209 gutter_width,
1210 em_width,
1211 })
1212 })
1213 }
1214 TransformBlock::ExcerptHeader {
1215 key,
1216 buffer,
1217 range,
1218 starts_new_buffer,
1219 ..
1220 } => {
1221 let jump_icon = project::File::from_dyn(buffer.file()).map(|file| {
1222 let jump_position = range
1223 .primary
1224 .as_ref()
1225 .map_or(range.context.start, |primary| primary.start);
1226 let jump_action = crate::Jump {
1227 path: ProjectPath {
1228 worktree_id: file.worktree_id(cx),
1229 path: file.path.clone(),
1230 },
1231 position: language::ToPoint::to_point(&jump_position, buffer),
1232 anchor: jump_position,
1233 };
1234
1235 enum JumpIcon {}
1236 cx.render(&editor, |_, cx| {
1237 MouseEventHandler::<JumpIcon>::new(*key, cx, |state, _| {
1238 let style = style.jump_icon.style_for(state, false);
1239 Svg::new("icons/arrow_up_right_8.svg")
1240 .with_color(style.color)
1241 .constrained()
1242 .with_width(style.icon_width)
1243 .aligned()
1244 .contained()
1245 .with_style(style.container)
1246 .constrained()
1247 .with_width(style.button_width)
1248 .with_height(style.button_width)
1249 .boxed()
1250 })
1251 .with_cursor_style(CursorStyle::PointingHand)
1252 .on_click(MouseButton::Left, move |_, cx| {
1253 cx.dispatch_action(jump_action.clone())
1254 })
1255 .with_tooltip::<JumpIcon, _>(
1256 *key,
1257 "Jump to Buffer".to_string(),
1258 Some(Box::new(crate::OpenExcerpts)),
1259 tooltip_style.clone(),
1260 cx,
1261 )
1262 .aligned()
1263 .flex_float()
1264 .boxed()
1265 })
1266 });
1267
1268 if *starts_new_buffer {
1269 let style = &self.style.diagnostic_path_header;
1270 let font_size =
1271 (style.text_scale_factor * self.style.text.font_size).round();
1272
1273 let mut filename = None;
1274 let mut parent_path = None;
1275 if let Some(file) = buffer.file() {
1276 let path = file.path();
1277 filename = path.file_name().map(|f| f.to_string_lossy().to_string());
1278 parent_path =
1279 path.parent().map(|p| p.to_string_lossy().to_string() + "/");
1280 }
1281
1282 Flex::row()
1283 .with_child(
1284 Label::new(
1285 filename.unwrap_or_else(|| "untitled".to_string()),
1286 style.filename.text.clone().with_font_size(font_size),
1287 )
1288 .contained()
1289 .with_style(style.filename.container)
1290 .aligned()
1291 .boxed(),
1292 )
1293 .with_children(parent_path.map(|path| {
1294 Label::new(path, style.path.text.clone().with_font_size(font_size))
1295 .contained()
1296 .with_style(style.path.container)
1297 .aligned()
1298 .boxed()
1299 }))
1300 .with_children(jump_icon)
1301 .contained()
1302 .with_style(style.container)
1303 .with_padding_left(gutter_padding)
1304 .with_padding_right(gutter_padding)
1305 .expanded()
1306 .named("path header block")
1307 } else {
1308 let text_style = self.style.text.clone();
1309 Flex::row()
1310 .with_child(Label::new("…".to_string(), text_style).boxed())
1311 .with_children(jump_icon)
1312 .contained()
1313 .with_padding_left(gutter_padding)
1314 .with_padding_right(gutter_padding)
1315 .expanded()
1316 .named("collapsed context")
1317 }
1318 }
1319 };
1320
1321 element.layout(
1322 SizeConstraint {
1323 min: Vector2F::zero(),
1324 max: vec2f(width, block.height() as f32 * line_height),
1325 },
1326 cx,
1327 );
1328 element
1329 };
1330
1331 let mut fixed_block_max_width = 0f32;
1332 let mut blocks = Vec::new();
1333 for (row, block) in fixed_blocks {
1334 let element = render_block(block, f32::INFINITY);
1335 fixed_block_max_width = fixed_block_max_width.max(element.size().x() + em_width);
1336 blocks.push(BlockLayout {
1337 row,
1338 element,
1339 style: BlockStyle::Fixed,
1340 });
1341 }
1342 for (row, block) in non_fixed_blocks {
1343 let style = match block {
1344 TransformBlock::Custom(block) => block.style(),
1345 TransformBlock::ExcerptHeader { .. } => BlockStyle::Sticky,
1346 };
1347 let width = match style {
1348 BlockStyle::Sticky => editor_width,
1349 BlockStyle::Flex => editor_width
1350 .max(fixed_block_max_width)
1351 .max(gutter_width + scroll_width),
1352 BlockStyle::Fixed => unreachable!(),
1353 };
1354 let element = render_block(block, width);
1355 blocks.push(BlockLayout {
1356 row,
1357 element,
1358 style,
1359 });
1360 }
1361 (
1362 scroll_width.max(fixed_block_max_width - gutter_width),
1363 blocks,
1364 )
1365 }
1366}
1367
1368/// Get the hunk that contains buffer_line, starting from start_idx
1369/// Returns none if there is none found, and
1370fn get_hunk(buffer_line: u32, hunks: &[DiffHunk<u32>]) -> Option<&DiffHunk<u32>> {
1371 for i in 0..hunks.len() {
1372 // Safety: Index out of bounds is handled by the check above
1373 let hunk = hunks.get(i).unwrap();
1374 if hunk.buffer_range.contains(&(buffer_line as u32)) {
1375 return Some(hunk);
1376 } else if hunk.status() == DiffHunkStatus::Removed && buffer_line == hunk.buffer_range.start
1377 {
1378 return Some(hunk);
1379 } else if hunk.buffer_range.start > buffer_line as u32 {
1380 // If we've passed the buffer_line, just stop
1381 return None;
1382 }
1383 }
1384
1385 // We reached the end of the array without finding a hunk, just return none.
1386 return None;
1387}
1388
1389impl Element for EditorElement {
1390 type LayoutState = LayoutState;
1391 type PaintState = ();
1392
1393 fn layout(
1394 &mut self,
1395 constraint: SizeConstraint,
1396 cx: &mut LayoutContext,
1397 ) -> (Vector2F, Self::LayoutState) {
1398 let mut size = constraint.max;
1399 if size.x().is_infinite() {
1400 unimplemented!("we don't yet handle an infinite width constraint on buffer elements");
1401 }
1402
1403 let snapshot = self.snapshot(cx.app);
1404 let style = self.style.clone();
1405 let line_height = style.text.line_height(cx.font_cache);
1406
1407 let gutter_padding;
1408 let gutter_width;
1409 let gutter_margin;
1410 if snapshot.mode == EditorMode::Full {
1411 gutter_padding = style.text.em_width(cx.font_cache) * style.gutter_padding_factor;
1412 gutter_width = self.max_line_number_width(&snapshot, cx) + gutter_padding * 2.0;
1413 gutter_margin = -style.text.descent(cx.font_cache);
1414 } else {
1415 gutter_padding = 0.0;
1416 gutter_width = 0.0;
1417 gutter_margin = 0.0;
1418 };
1419
1420 let text_width = size.x() - gutter_width;
1421 let em_width = style.text.em_width(cx.font_cache);
1422 let em_advance = style.text.em_advance(cx.font_cache);
1423 let overscroll = vec2f(em_width, 0.);
1424 let snapshot = self.update_view(cx.app, |view, cx| {
1425 let wrap_width = match view.soft_wrap_mode(cx) {
1426 SoftWrap::None => Some((MAX_LINE_LEN / 2) as f32 * em_advance),
1427 SoftWrap::EditorWidth => {
1428 Some(text_width - gutter_margin - overscroll.x() - em_width)
1429 }
1430 SoftWrap::Column(column) => Some(column as f32 * em_advance),
1431 };
1432
1433 if view.set_wrap_width(wrap_width, cx) {
1434 view.snapshot(cx)
1435 } else {
1436 snapshot
1437 }
1438 });
1439
1440 let scroll_height = (snapshot.max_point().row() + 1) as f32 * line_height;
1441 if let EditorMode::AutoHeight { max_lines } = snapshot.mode {
1442 size.set_y(
1443 scroll_height
1444 .min(constraint.max_along(Axis::Vertical))
1445 .max(constraint.min_along(Axis::Vertical))
1446 .min(line_height * max_lines as f32),
1447 )
1448 } else if let EditorMode::SingleLine = snapshot.mode {
1449 size.set_y(
1450 line_height
1451 .min(constraint.max_along(Axis::Vertical))
1452 .max(constraint.min_along(Axis::Vertical)),
1453 )
1454 } else if size.y().is_infinite() {
1455 size.set_y(scroll_height);
1456 }
1457 let gutter_size = vec2f(gutter_width, size.y());
1458 let text_size = vec2f(text_width, size.y());
1459
1460 let (autoscroll_horizontally, mut snapshot) = self.update_view(cx.app, |view, cx| {
1461 let autoscroll_horizontally = view.autoscroll_vertically(size.y(), line_height, cx);
1462 let snapshot = view.snapshot(cx);
1463 (autoscroll_horizontally, snapshot)
1464 });
1465
1466 let scroll_position = snapshot.scroll_position();
1467 // The scroll position is a fractional point, the whole number of which represents
1468 // the top of the window in terms of display rows.
1469 let start_row = scroll_position.y() as u32;
1470 let scroll_top = scroll_position.y() * line_height;
1471
1472 // Add 1 to ensure selections bleed off screen
1473 let end_row = 1 + cmp::min(
1474 ((scroll_top + size.y()) / line_height).ceil() as u32,
1475 snapshot.max_point().row(),
1476 );
1477
1478 let start_anchor = if start_row == 0 {
1479 Anchor::min()
1480 } else {
1481 snapshot
1482 .buffer_snapshot
1483 .anchor_before(DisplayPoint::new(start_row, 0).to_offset(&snapshot, Bias::Left))
1484 };
1485 let end_anchor = if end_row > snapshot.max_point().row() {
1486 Anchor::max()
1487 } else {
1488 snapshot
1489 .buffer_snapshot
1490 .anchor_before(DisplayPoint::new(end_row, 0).to_offset(&snapshot, Bias::Right))
1491 };
1492
1493 let mut selections: Vec<(ReplicaId, Vec<SelectionLayout>)> = Vec::new();
1494 let mut active_rows = BTreeMap::new();
1495 let mut highlighted_rows = None;
1496 let mut highlighted_ranges = Vec::new();
1497 self.update_view(cx.app, |view, cx| {
1498 let display_map = view.display_map.update(cx, |map, cx| map.snapshot(cx));
1499
1500 highlighted_rows = view.highlighted_rows();
1501 let theme = cx.global::<Settings>().theme.as_ref();
1502 highlighted_ranges = view.background_highlights_in_range(
1503 start_anchor.clone()..end_anchor.clone(),
1504 &display_map,
1505 theme,
1506 );
1507
1508 let mut remote_selections = HashMap::default();
1509 for (replica_id, line_mode, selection) in display_map
1510 .buffer_snapshot
1511 .remote_selections_in_range(&(start_anchor.clone()..end_anchor.clone()))
1512 {
1513 // The local selections match the leader's selections.
1514 if Some(replica_id) == view.leader_replica_id {
1515 continue;
1516 }
1517 remote_selections
1518 .entry(replica_id)
1519 .or_insert(Vec::new())
1520 .push(SelectionLayout::new(selection, line_mode, &display_map));
1521 }
1522 selections.extend(remote_selections);
1523
1524 if view.show_local_selections {
1525 let mut local_selections = view
1526 .selections
1527 .disjoint_in_range(start_anchor..end_anchor, cx);
1528 local_selections.extend(view.selections.pending(cx));
1529 for selection in &local_selections {
1530 let is_empty = selection.start == selection.end;
1531 let selection_start = snapshot.prev_line_boundary(selection.start).1;
1532 let selection_end = snapshot.next_line_boundary(selection.end).1;
1533 for row in cmp::max(selection_start.row(), start_row)
1534 ..=cmp::min(selection_end.row(), end_row)
1535 {
1536 let contains_non_empty_selection =
1537 active_rows.entry(row).or_insert(!is_empty);
1538 *contains_non_empty_selection |= !is_empty;
1539 }
1540 }
1541
1542 // Render the local selections in the leader's color when following.
1543 let local_replica_id = view
1544 .leader_replica_id
1545 .unwrap_or_else(|| view.replica_id(cx));
1546
1547 selections.push((
1548 local_replica_id,
1549 local_selections
1550 .into_iter()
1551 .map(|selection| {
1552 SelectionLayout::new(selection, view.selections.line_mode, &display_map)
1553 })
1554 .collect(),
1555 ));
1556 }
1557 });
1558
1559 let line_number_layouts =
1560 self.layout_line_numbers(start_row..end_row, &active_rows, &snapshot, cx);
1561
1562 let diff_hunks = snapshot
1563 .buffer_snapshot
1564 .git_diff_hunks_in_range(start_row..end_row)
1565 .collect();
1566
1567 let mut max_visible_line_width = 0.0;
1568 let line_layouts = self.layout_lines(start_row..end_row, &snapshot, cx);
1569 for line in &line_layouts {
1570 if line.width() > max_visible_line_width {
1571 max_visible_line_width = line.width();
1572 }
1573 }
1574
1575 let style = self.style.clone();
1576 let longest_line_width = layout_line(
1577 snapshot.longest_row(),
1578 &snapshot,
1579 &style,
1580 cx.text_layout_cache,
1581 )
1582 .width();
1583 let scroll_width = longest_line_width.max(max_visible_line_width) + overscroll.x();
1584 let em_width = style.text.em_width(cx.font_cache);
1585 let (scroll_width, blocks) = self.layout_blocks(
1586 start_row..end_row,
1587 &snapshot,
1588 size.x(),
1589 scroll_width,
1590 gutter_padding,
1591 gutter_width,
1592 em_width,
1593 gutter_width + gutter_margin,
1594 line_height,
1595 &style,
1596 &line_layouts,
1597 cx,
1598 );
1599
1600 let max_row = snapshot.max_point().row();
1601 let scroll_max = vec2f(
1602 ((scroll_width - text_size.x()) / em_width).max(0.0),
1603 max_row.saturating_sub(1) as f32,
1604 );
1605
1606 self.update_view(cx.app, |view, cx| {
1607 let clamped = view.clamp_scroll_left(scroll_max.x());
1608
1609 let autoscrolled = if autoscroll_horizontally {
1610 view.autoscroll_horizontally(
1611 start_row,
1612 text_size.x(),
1613 scroll_width,
1614 em_width,
1615 &line_layouts,
1616 cx,
1617 )
1618 } else {
1619 false
1620 };
1621
1622 if clamped || autoscrolled {
1623 snapshot = view.snapshot(cx);
1624 }
1625 });
1626
1627 let mut context_menu = None;
1628 let mut code_actions_indicator = None;
1629 let mut hover = None;
1630 cx.render(&self.view.upgrade(cx).unwrap(), |view, cx| {
1631 let newest_selection_head = view
1632 .selections
1633 .newest::<usize>(cx)
1634 .head()
1635 .to_display_point(&snapshot);
1636
1637 let style = view.style(cx);
1638 if (start_row..end_row).contains(&newest_selection_head.row()) {
1639 if view.context_menu_visible() {
1640 context_menu =
1641 view.render_context_menu(newest_selection_head, style.clone(), cx);
1642 }
1643
1644 code_actions_indicator = view
1645 .render_code_actions_indicator(&style, cx)
1646 .map(|indicator| (newest_selection_head.row(), indicator));
1647 }
1648
1649 let visible_rows = start_row..start_row + line_layouts.len() as u32;
1650 hover = view.hover_state.render(&snapshot, &style, visible_rows, cx);
1651 });
1652
1653 if let Some((_, context_menu)) = context_menu.as_mut() {
1654 context_menu.layout(
1655 SizeConstraint {
1656 min: Vector2F::zero(),
1657 max: vec2f(
1658 cx.window_size.x() * 0.7,
1659 (12. * line_height).min((size.y() - line_height) / 2.),
1660 ),
1661 },
1662 cx,
1663 );
1664 }
1665
1666 if let Some((_, indicator)) = code_actions_indicator.as_mut() {
1667 indicator.layout(
1668 SizeConstraint::strict_along(
1669 Axis::Vertical,
1670 line_height * style.code_actions.vertical_scale,
1671 ),
1672 cx,
1673 );
1674 }
1675
1676 if let Some((_, hover_popovers)) = hover.as_mut() {
1677 for hover_popover in hover_popovers.iter_mut() {
1678 hover_popover.layout(
1679 SizeConstraint {
1680 min: Vector2F::zero(),
1681 max: vec2f(
1682 (120. * em_width) // Default size
1683 .min(size.x() / 2.) // Shrink to half of the editor width
1684 .max(MIN_POPOVER_CHARACTER_WIDTH * em_width), // Apply minimum width of 20 characters
1685 (16. * line_height) // Default size
1686 .min(size.y() / 2.) // Shrink to half of the editor height
1687 .max(MIN_POPOVER_LINE_HEIGHT * line_height), // Apply minimum height of 4 lines
1688 ),
1689 },
1690 cx,
1691 );
1692 }
1693 }
1694
1695 (
1696 size,
1697 LayoutState {
1698 position_map: Arc::new(PositionMap {
1699 size,
1700 scroll_max,
1701 line_layouts,
1702 line_height,
1703 em_width,
1704 em_advance,
1705 snapshot,
1706 }),
1707 gutter_size,
1708 gutter_padding,
1709 text_size,
1710 gutter_margin,
1711 active_rows,
1712 highlighted_rows,
1713 highlighted_ranges,
1714 line_number_layouts,
1715 diff_hunks,
1716 blocks,
1717 selections,
1718 context_menu,
1719 code_actions_indicator,
1720 hover_popovers: hover,
1721 },
1722 )
1723 }
1724
1725 fn paint(
1726 &mut self,
1727 bounds: RectF,
1728 visible_bounds: RectF,
1729 layout: &mut Self::LayoutState,
1730 cx: &mut PaintContext,
1731 ) -> Self::PaintState {
1732 let visible_bounds = bounds.intersection(visible_bounds).unwrap_or_default();
1733 cx.scene.push_layer(Some(visible_bounds));
1734
1735 let gutter_bounds = RectF::new(bounds.origin(), layout.gutter_size);
1736 let text_bounds = RectF::new(
1737 bounds.origin() + vec2f(layout.gutter_size.x(), 0.0),
1738 layout.text_size,
1739 );
1740
1741 Self::attach_mouse_handlers(
1742 &self.view,
1743 &layout.position_map,
1744 visible_bounds,
1745 text_bounds,
1746 gutter_bounds,
1747 bounds,
1748 cx,
1749 );
1750
1751 self.paint_background(gutter_bounds, text_bounds, layout, cx);
1752 if layout.gutter_size.x() > 0. {
1753 self.paint_gutter(gutter_bounds, visible_bounds, layout, cx);
1754 }
1755 self.paint_text(text_bounds, visible_bounds, layout, cx);
1756
1757 if !layout.blocks.is_empty() {
1758 cx.scene.push_layer(Some(bounds));
1759 self.paint_blocks(bounds, visible_bounds, layout, cx);
1760 cx.scene.pop_layer();
1761 }
1762
1763 cx.scene.pop_layer();
1764 }
1765
1766 fn dispatch_event(
1767 &mut self,
1768 event: &Event,
1769 _: RectF,
1770 _: RectF,
1771 _: &mut LayoutState,
1772 _: &mut (),
1773 cx: &mut EventContext,
1774 ) -> bool {
1775 if let Event::ModifiersChanged(event) = event {
1776 self.modifiers_changed(*event, cx);
1777 }
1778
1779 false
1780 }
1781
1782 fn rect_for_text_range(
1783 &self,
1784 range_utf16: Range<usize>,
1785 bounds: RectF,
1786 _: RectF,
1787 layout: &Self::LayoutState,
1788 _: &Self::PaintState,
1789 _: &gpui::MeasurementContext,
1790 ) -> Option<RectF> {
1791 let text_bounds = RectF::new(
1792 bounds.origin() + vec2f(layout.gutter_size.x(), 0.0),
1793 layout.text_size,
1794 );
1795 let content_origin = text_bounds.origin() + vec2f(layout.gutter_margin, 0.);
1796 let scroll_position = layout.position_map.snapshot.scroll_position();
1797 let start_row = scroll_position.y() as u32;
1798 let scroll_top = scroll_position.y() * layout.position_map.line_height;
1799 let scroll_left = scroll_position.x() * layout.position_map.em_width;
1800
1801 let range_start = OffsetUtf16(range_utf16.start)
1802 .to_display_point(&layout.position_map.snapshot.display_snapshot);
1803 if range_start.row() < start_row {
1804 return None;
1805 }
1806
1807 let line = layout
1808 .position_map
1809 .line_layouts
1810 .get((range_start.row() - start_row) as usize)?;
1811 let range_start_x = line.x_for_index(range_start.column() as usize);
1812 let range_start_y = range_start.row() as f32 * layout.position_map.line_height;
1813 Some(RectF::new(
1814 content_origin
1815 + vec2f(
1816 range_start_x,
1817 range_start_y + layout.position_map.line_height,
1818 )
1819 - vec2f(scroll_left, scroll_top),
1820 vec2f(
1821 layout.position_map.em_width,
1822 layout.position_map.line_height,
1823 ),
1824 ))
1825 }
1826
1827 fn debug(
1828 &self,
1829 bounds: RectF,
1830 _: &Self::LayoutState,
1831 _: &Self::PaintState,
1832 _: &gpui::DebugContext,
1833 ) -> json::Value {
1834 json!({
1835 "type": "BufferElement",
1836 "bounds": bounds.to_json()
1837 })
1838 }
1839}
1840
1841pub struct LayoutState {
1842 position_map: Arc<PositionMap>,
1843 gutter_size: Vector2F,
1844 gutter_padding: f32,
1845 gutter_margin: f32,
1846 text_size: Vector2F,
1847 active_rows: BTreeMap<u32, bool>,
1848 highlighted_rows: Option<Range<u32>>,
1849 line_number_layouts: Vec<Option<text_layout::Line>>,
1850 blocks: Vec<BlockLayout>,
1851 highlighted_ranges: Vec<(Range<DisplayPoint>, Color)>,
1852 selections: Vec<(ReplicaId, Vec<SelectionLayout>)>,
1853 context_menu: Option<(DisplayPoint, ElementBox)>,
1854 diff_hunks: Vec<DiffHunk<u32>>,
1855 code_actions_indicator: Option<(u32, ElementBox)>,
1856 hover_popovers: Option<(DisplayPoint, Vec<ElementBox>)>,
1857}
1858
1859pub struct PositionMap {
1860 size: Vector2F,
1861 line_height: f32,
1862 scroll_max: Vector2F,
1863 em_width: f32,
1864 em_advance: f32,
1865 line_layouts: Vec<text_layout::Line>,
1866 snapshot: EditorSnapshot,
1867}
1868
1869impl PositionMap {
1870 /// Returns two display points:
1871 /// 1. The nearest *valid* position in the editor
1872 /// 2. An unclipped, potentially *invalid* position that maps directly to
1873 /// the given pixel position.
1874 fn point_for_position(
1875 &self,
1876 text_bounds: RectF,
1877 position: Vector2F,
1878 ) -> (DisplayPoint, DisplayPoint) {
1879 let scroll_position = self.snapshot.scroll_position();
1880 let position = position - text_bounds.origin();
1881 let y = position.y().max(0.0).min(self.size.y());
1882 let x = position.x() + (scroll_position.x() * self.em_width);
1883 let row = (y / self.line_height + scroll_position.y()) as u32;
1884 let (column, x_overshoot) = if let Some(line) = self
1885 .line_layouts
1886 .get(row as usize - scroll_position.y() as usize)
1887 {
1888 if let Some(ix) = line.index_for_x(x) {
1889 (ix as u32, 0.0)
1890 } else {
1891 (line.len() as u32, 0f32.max(x - line.width()))
1892 }
1893 } else {
1894 (0, x)
1895 };
1896
1897 let mut target_point = DisplayPoint::new(row, column);
1898 let point = self.snapshot.clip_point(target_point, Bias::Left);
1899 *target_point.column_mut() += (x_overshoot / self.em_advance) as u32;
1900
1901 (point, target_point)
1902 }
1903}
1904
1905struct BlockLayout {
1906 row: u32,
1907 element: ElementBox,
1908 style: BlockStyle,
1909}
1910
1911fn layout_line(
1912 row: u32,
1913 snapshot: &EditorSnapshot,
1914 style: &EditorStyle,
1915 layout_cache: &TextLayoutCache,
1916) -> text_layout::Line {
1917 let mut line = snapshot.line(row);
1918
1919 if line.len() > MAX_LINE_LEN {
1920 let mut len = MAX_LINE_LEN;
1921 while !line.is_char_boundary(len) {
1922 len -= 1;
1923 }
1924
1925 line.truncate(len);
1926 }
1927
1928 layout_cache.layout_str(
1929 &line,
1930 style.text.font_size,
1931 &[(
1932 snapshot.line_len(row) as usize,
1933 RunStyle {
1934 font_id: style.text.font_id,
1935 color: Color::black(),
1936 underline: Default::default(),
1937 },
1938 )],
1939 )
1940}
1941
1942#[derive(Copy, Clone, PartialEq, Eq, Debug)]
1943pub enum CursorShape {
1944 Bar,
1945 Block,
1946 Underscore,
1947 Hollow,
1948}
1949
1950impl Default for CursorShape {
1951 fn default() -> Self {
1952 CursorShape::Bar
1953 }
1954}
1955
1956#[derive(Debug)]
1957pub struct Cursor {
1958 origin: Vector2F,
1959 block_width: f32,
1960 line_height: f32,
1961 color: Color,
1962 shape: CursorShape,
1963 block_text: Option<Line>,
1964}
1965
1966impl Cursor {
1967 pub fn new(
1968 origin: Vector2F,
1969 block_width: f32,
1970 line_height: f32,
1971 color: Color,
1972 shape: CursorShape,
1973 block_text: Option<Line>,
1974 ) -> Cursor {
1975 Cursor {
1976 origin,
1977 block_width,
1978 line_height,
1979 color,
1980 shape,
1981 block_text,
1982 }
1983 }
1984
1985 pub fn bounding_rect(&self, origin: Vector2F) -> RectF {
1986 RectF::new(
1987 self.origin + origin,
1988 vec2f(self.block_width, self.line_height),
1989 )
1990 }
1991
1992 pub fn paint(&self, origin: Vector2F, cx: &mut PaintContext) {
1993 let bounds = match self.shape {
1994 CursorShape::Bar => RectF::new(self.origin + origin, vec2f(2.0, self.line_height)),
1995 CursorShape::Block | CursorShape::Hollow => RectF::new(
1996 self.origin + origin,
1997 vec2f(self.block_width, self.line_height),
1998 ),
1999 CursorShape::Underscore => RectF::new(
2000 self.origin + origin + Vector2F::new(0.0, self.line_height - 2.0),
2001 vec2f(self.block_width, 2.0),
2002 ),
2003 };
2004
2005 //Draw background or border quad
2006 if matches!(self.shape, CursorShape::Hollow) {
2007 cx.scene.push_quad(Quad {
2008 bounds,
2009 background: None,
2010 border: Border::all(1., self.color),
2011 corner_radius: 0.,
2012 });
2013 } else {
2014 cx.scene.push_quad(Quad {
2015 bounds,
2016 background: Some(self.color),
2017 border: Default::default(),
2018 corner_radius: 0.,
2019 });
2020 }
2021
2022 if let Some(block_text) = &self.block_text {
2023 block_text.paint(self.origin + origin, bounds, self.line_height, cx);
2024 }
2025 }
2026
2027 pub fn shape(&self) -> CursorShape {
2028 self.shape
2029 }
2030}
2031
2032#[derive(Debug)]
2033pub struct HighlightedRange {
2034 pub start_y: f32,
2035 pub line_height: f32,
2036 pub lines: Vec<HighlightedRangeLine>,
2037 pub color: Color,
2038 pub corner_radius: f32,
2039}
2040
2041#[derive(Debug)]
2042pub struct HighlightedRangeLine {
2043 pub start_x: f32,
2044 pub end_x: f32,
2045}
2046
2047impl HighlightedRange {
2048 pub fn paint(&self, bounds: RectF, scene: &mut Scene) {
2049 if self.lines.len() >= 2 && self.lines[0].start_x > self.lines[1].end_x {
2050 self.paint_lines(self.start_y, &self.lines[0..1], bounds, scene);
2051 self.paint_lines(
2052 self.start_y + self.line_height,
2053 &self.lines[1..],
2054 bounds,
2055 scene,
2056 );
2057 } else {
2058 self.paint_lines(self.start_y, &self.lines, bounds, scene);
2059 }
2060 }
2061
2062 fn paint_lines(
2063 &self,
2064 start_y: f32,
2065 lines: &[HighlightedRangeLine],
2066 bounds: RectF,
2067 scene: &mut Scene,
2068 ) {
2069 if lines.is_empty() {
2070 return;
2071 }
2072
2073 let mut path = PathBuilder::new();
2074 let first_line = lines.first().unwrap();
2075 let last_line = lines.last().unwrap();
2076
2077 let first_top_left = vec2f(first_line.start_x, start_y);
2078 let first_top_right = vec2f(first_line.end_x, start_y);
2079
2080 let curve_height = vec2f(0., self.corner_radius);
2081 let curve_width = |start_x: f32, end_x: f32| {
2082 let max = (end_x - start_x) / 2.;
2083 let width = if max < self.corner_radius {
2084 max
2085 } else {
2086 self.corner_radius
2087 };
2088
2089 vec2f(width, 0.)
2090 };
2091
2092 let top_curve_width = curve_width(first_line.start_x, first_line.end_x);
2093 path.reset(first_top_right - top_curve_width);
2094 path.curve_to(first_top_right + curve_height, first_top_right);
2095
2096 let mut iter = lines.iter().enumerate().peekable();
2097 while let Some((ix, line)) = iter.next() {
2098 let bottom_right = vec2f(line.end_x, start_y + (ix + 1) as f32 * self.line_height);
2099
2100 if let Some((_, next_line)) = iter.peek() {
2101 let next_top_right = vec2f(next_line.end_x, bottom_right.y());
2102
2103 match next_top_right.x().partial_cmp(&bottom_right.x()).unwrap() {
2104 Ordering::Equal => {
2105 path.line_to(bottom_right);
2106 }
2107 Ordering::Less => {
2108 let curve_width = curve_width(next_top_right.x(), bottom_right.x());
2109 path.line_to(bottom_right - curve_height);
2110 if self.corner_radius > 0. {
2111 path.curve_to(bottom_right - curve_width, bottom_right);
2112 }
2113 path.line_to(next_top_right + curve_width);
2114 if self.corner_radius > 0. {
2115 path.curve_to(next_top_right + curve_height, next_top_right);
2116 }
2117 }
2118 Ordering::Greater => {
2119 let curve_width = curve_width(bottom_right.x(), next_top_right.x());
2120 path.line_to(bottom_right - curve_height);
2121 if self.corner_radius > 0. {
2122 path.curve_to(bottom_right + curve_width, bottom_right);
2123 }
2124 path.line_to(next_top_right - curve_width);
2125 if self.corner_radius > 0. {
2126 path.curve_to(next_top_right + curve_height, next_top_right);
2127 }
2128 }
2129 }
2130 } else {
2131 let curve_width = curve_width(line.start_x, line.end_x);
2132 path.line_to(bottom_right - curve_height);
2133 if self.corner_radius > 0. {
2134 path.curve_to(bottom_right - curve_width, bottom_right);
2135 }
2136
2137 let bottom_left = vec2f(line.start_x, bottom_right.y());
2138 path.line_to(bottom_left + curve_width);
2139 if self.corner_radius > 0. {
2140 path.curve_to(bottom_left - curve_height, bottom_left);
2141 }
2142 }
2143 }
2144
2145 if first_line.start_x > last_line.start_x {
2146 let curve_width = curve_width(last_line.start_x, first_line.start_x);
2147 let second_top_left = vec2f(last_line.start_x, start_y + self.line_height);
2148 path.line_to(second_top_left + curve_height);
2149 if self.corner_radius > 0. {
2150 path.curve_to(second_top_left + curve_width, second_top_left);
2151 }
2152 let first_bottom_left = vec2f(first_line.start_x, second_top_left.y());
2153 path.line_to(first_bottom_left - curve_width);
2154 if self.corner_radius > 0. {
2155 path.curve_to(first_bottom_left - curve_height, first_bottom_left);
2156 }
2157 }
2158
2159 path.line_to(first_top_left + curve_height);
2160 if self.corner_radius > 0. {
2161 path.curve_to(first_top_left + top_curve_width, first_top_left);
2162 }
2163 path.line_to(first_top_right - top_curve_width);
2164
2165 scene.push_path(path.build(self.color, Some(bounds)));
2166 }
2167}
2168
2169pub fn scale_vertical_mouse_autoscroll_delta(delta: f32) -> f32 {
2170 delta.powf(1.5) / 100.0
2171}
2172
2173fn scale_horizontal_mouse_autoscroll_delta(delta: f32) -> f32 {
2174 delta.powf(1.2) / 300.0
2175}
2176
2177#[cfg(test)]
2178mod tests {
2179 use std::sync::Arc;
2180
2181 use super::*;
2182 use crate::{
2183 display_map::{BlockDisposition, BlockProperties},
2184 Editor, MultiBuffer,
2185 };
2186 use settings::Settings;
2187 use util::test::sample_text;
2188
2189 #[gpui::test]
2190 fn test_layout_line_numbers(cx: &mut gpui::MutableAppContext) {
2191 cx.set_global(Settings::test(cx));
2192 let buffer = MultiBuffer::build_simple(&sample_text(6, 6, 'a'), cx);
2193 let (window_id, editor) = cx.add_window(Default::default(), |cx| {
2194 Editor::new(EditorMode::Full, buffer, None, None, cx)
2195 });
2196 let element = EditorElement::new(
2197 editor.downgrade(),
2198 editor.read(cx).style(cx),
2199 CursorShape::Bar,
2200 );
2201
2202 let layouts = editor.update(cx, |editor, cx| {
2203 let snapshot = editor.snapshot(cx);
2204 let mut presenter = cx.build_presenter(window_id, 30., Default::default());
2205 let layout_cx = presenter.build_layout_context(Vector2F::zero(), false, cx);
2206 element.layout_line_numbers(0..6, &Default::default(), &snapshot, &layout_cx)
2207 });
2208 assert_eq!(layouts.len(), 6);
2209 }
2210
2211 #[gpui::test]
2212 fn test_layout_with_placeholder_text_and_blocks(cx: &mut gpui::MutableAppContext) {
2213 cx.set_global(Settings::test(cx));
2214 let buffer = MultiBuffer::build_simple("", cx);
2215 let (window_id, editor) = cx.add_window(Default::default(), |cx| {
2216 Editor::new(EditorMode::Full, buffer, None, None, cx)
2217 });
2218
2219 editor.update(cx, |editor, cx| {
2220 editor.set_placeholder_text("hello", cx);
2221 editor.insert_blocks(
2222 [BlockProperties {
2223 style: BlockStyle::Fixed,
2224 disposition: BlockDisposition::Above,
2225 height: 3,
2226 position: Anchor::min(),
2227 render: Arc::new(|_| Empty::new().boxed()),
2228 }],
2229 cx,
2230 );
2231
2232 // Blur the editor so that it displays placeholder text.
2233 cx.blur();
2234 });
2235
2236 let mut element = EditorElement::new(
2237 editor.downgrade(),
2238 editor.read(cx).style(cx),
2239 CursorShape::Bar,
2240 );
2241
2242 let mut scene = Scene::new(1.0);
2243 let mut presenter = cx.build_presenter(window_id, 30., Default::default());
2244 let mut layout_cx = presenter.build_layout_context(Vector2F::zero(), false, cx);
2245 let (size, mut state) = element.layout(
2246 SizeConstraint::new(vec2f(500., 500.), vec2f(500., 500.)),
2247 &mut layout_cx,
2248 );
2249
2250 assert_eq!(state.position_map.line_layouts.len(), 4);
2251 assert_eq!(
2252 state
2253 .line_number_layouts
2254 .iter()
2255 .map(Option::is_some)
2256 .collect::<Vec<_>>(),
2257 &[false, false, false, true]
2258 );
2259
2260 // Don't panic.
2261 let bounds = RectF::new(Default::default(), size);
2262 let mut paint_cx = presenter.build_paint_context(&mut scene, bounds.size(), cx);
2263 element.paint(bounds, bounds, &mut state, &mut paint_cx);
2264 }
2265}