1use super::{
2 display_map::{BlockContext, ToDisplayPoint},
3 Anchor, DisplayPoint, Editor, EditorMode, EditorSnapshot, Input, Scroll, Select, SelectPhase,
4 SoftWrap, ToPoint, MAX_LINE_LEN,
5};
6use crate::{display_map::TransformBlock, EditorStyle};
7use clock::ReplicaId;
8use collections::{BTreeMap, HashMap};
9use gpui::{
10 color::Color,
11 elements::*,
12 fonts::{HighlightStyle, Underline},
13 geometry::{
14 rect::RectF,
15 vector::{vec2f, Vector2F},
16 PathBuilder,
17 },
18 json::{self, ToJson},
19 platform::CursorStyle,
20 text_layout::{self, Line, RunStyle, TextLayoutCache},
21 AppContext, Axis, Border, Element, ElementBox, Event, EventContext, LayoutContext,
22 MutableAppContext, PaintContext, Quad, Scene, SizeConstraint, ViewContext, WeakViewHandle,
23};
24use json::json;
25use language::{Bias, DiagnosticSeverity};
26use settings::Settings;
27use smallvec::SmallVec;
28use std::{
29 cmp::{self, Ordering},
30 fmt::Write,
31 iter,
32 ops::Range,
33};
34
35pub struct EditorElement {
36 view: WeakViewHandle<Editor>,
37 style: EditorStyle,
38 cursor_shape: CursorShape,
39}
40
41impl EditorElement {
42 pub fn new(
43 view: WeakViewHandle<Editor>,
44 style: EditorStyle,
45 cursor_shape: CursorShape,
46 ) -> Self {
47 Self {
48 view,
49 style,
50 cursor_shape,
51 }
52 }
53
54 fn view<'a>(&self, cx: &'a AppContext) -> &'a Editor {
55 self.view.upgrade(cx).unwrap().read(cx)
56 }
57
58 fn update_view<F, T>(&self, cx: &mut MutableAppContext, f: F) -> T
59 where
60 F: FnOnce(&mut Editor, &mut ViewContext<Editor>) -> T,
61 {
62 self.view.upgrade(cx).unwrap().update(cx, f)
63 }
64
65 fn snapshot(&self, cx: &mut MutableAppContext) -> EditorSnapshot {
66 self.update_view(cx, |view, cx| view.snapshot(cx))
67 }
68
69 fn mouse_down(
70 &self,
71 position: Vector2F,
72 alt: bool,
73 shift: bool,
74 mut click_count: usize,
75 layout: &mut LayoutState,
76 paint: &mut PaintState,
77 cx: &mut EventContext,
78 ) -> bool {
79 if paint.gutter_bounds.contains_point(position) {
80 click_count = 3; // Simulate triple-click when clicking the gutter to select lines
81 } else if !paint.text_bounds.contains_point(position) {
82 return false;
83 }
84
85 let snapshot = self.snapshot(cx.app);
86 let (position, overshoot) = paint.point_for_position(&snapshot, layout, position);
87
88 if shift && alt {
89 cx.dispatch_action(Select(SelectPhase::BeginColumnar {
90 position,
91 overshoot,
92 }));
93 } else if shift {
94 cx.dispatch_action(Select(SelectPhase::Extend {
95 position,
96 click_count,
97 }));
98 } else {
99 cx.dispatch_action(Select(SelectPhase::Begin {
100 position,
101 add: alt,
102 click_count,
103 }));
104 }
105
106 true
107 }
108
109 fn mouse_up(&self, _position: Vector2F, cx: &mut EventContext) -> bool {
110 if self.view(cx.app.as_ref()).is_selecting() {
111 cx.dispatch_action(Select(SelectPhase::End));
112 true
113 } else {
114 false
115 }
116 }
117
118 fn mouse_dragged(
119 &self,
120 position: Vector2F,
121 layout: &mut LayoutState,
122 paint: &mut PaintState,
123 cx: &mut EventContext,
124 ) -> bool {
125 let view = self.view(cx.app.as_ref());
126
127 if view.is_selecting() {
128 let rect = paint.text_bounds;
129 let mut scroll_delta = Vector2F::zero();
130
131 let vertical_margin = layout.line_height.min(rect.height() / 3.0);
132 let top = rect.origin_y() + vertical_margin;
133 let bottom = rect.lower_left().y() - vertical_margin;
134 if position.y() < top {
135 scroll_delta.set_y(-scale_vertical_mouse_autoscroll_delta(top - position.y()))
136 }
137 if position.y() > bottom {
138 scroll_delta.set_y(scale_vertical_mouse_autoscroll_delta(position.y() - bottom))
139 }
140
141 let horizontal_margin = layout.line_height.min(rect.width() / 3.0);
142 let left = rect.origin_x() + horizontal_margin;
143 let right = rect.upper_right().x() - horizontal_margin;
144 if position.x() < left {
145 scroll_delta.set_x(-scale_horizontal_mouse_autoscroll_delta(
146 left - position.x(),
147 ))
148 }
149 if position.x() > right {
150 scroll_delta.set_x(scale_horizontal_mouse_autoscroll_delta(
151 position.x() - right,
152 ))
153 }
154
155 let snapshot = self.snapshot(cx.app);
156 let (position, overshoot) = paint.point_for_position(&snapshot, layout, position);
157
158 cx.dispatch_action(Select(SelectPhase::Update {
159 position,
160 overshoot,
161 scroll_position: (snapshot.scroll_position() + scroll_delta)
162 .clamp(Vector2F::zero(), layout.scroll_max),
163 }));
164 true
165 } else {
166 false
167 }
168 }
169
170 fn key_down(&self, input: Option<&str>, cx: &mut EventContext) -> bool {
171 let view = self.view.upgrade(cx.app).unwrap();
172
173 if view.is_focused(cx.app) {
174 if let Some(input) = input {
175 cx.dispatch_action(Input(input.to_string()));
176 true
177 } else {
178 false
179 }
180 } else {
181 false
182 }
183 }
184
185 fn scroll(
186 &self,
187 position: Vector2F,
188 mut delta: Vector2F,
189 precise: bool,
190 layout: &mut LayoutState,
191 paint: &mut PaintState,
192 cx: &mut EventContext,
193 ) -> bool {
194 if !paint.bounds.contains_point(position) {
195 return false;
196 }
197
198 let snapshot = self.snapshot(cx.app);
199 let max_glyph_width = layout.em_width;
200 if !precise {
201 delta *= vec2f(max_glyph_width, layout.line_height);
202 }
203
204 let scroll_position = snapshot.scroll_position();
205 let x = (scroll_position.x() * max_glyph_width - delta.x()) / max_glyph_width;
206 let y = (scroll_position.y() * layout.line_height - delta.y()) / layout.line_height;
207 let scroll_position = vec2f(x, y).clamp(Vector2F::zero(), layout.scroll_max);
208
209 cx.dispatch_action(Scroll(scroll_position));
210
211 true
212 }
213
214 fn paint_background(
215 &self,
216 gutter_bounds: RectF,
217 text_bounds: RectF,
218 layout: &LayoutState,
219 cx: &mut PaintContext,
220 ) {
221 let bounds = gutter_bounds.union_rect(text_bounds);
222 let scroll_top = layout.snapshot.scroll_position().y() * layout.line_height;
223 let editor = self.view(cx.app);
224 cx.scene.push_quad(Quad {
225 bounds: gutter_bounds,
226 background: Some(self.style.gutter_background),
227 border: Border::new(0., Color::transparent_black()),
228 corner_radius: 0.,
229 });
230 cx.scene.push_quad(Quad {
231 bounds: text_bounds,
232 background: Some(self.style.background),
233 border: Border::new(0., Color::transparent_black()),
234 corner_radius: 0.,
235 });
236
237 if let EditorMode::Full = editor.mode {
238 let mut active_rows = layout.active_rows.iter().peekable();
239 while let Some((start_row, contains_non_empty_selection)) = active_rows.next() {
240 let mut end_row = *start_row;
241 while active_rows.peek().map_or(false, |r| {
242 *r.0 == end_row + 1 && r.1 == contains_non_empty_selection
243 }) {
244 active_rows.next().unwrap();
245 end_row += 1;
246 }
247
248 if !contains_non_empty_selection {
249 let origin = vec2f(
250 bounds.origin_x(),
251 bounds.origin_y() + (layout.line_height * *start_row as f32) - scroll_top,
252 );
253 let size = vec2f(
254 bounds.width(),
255 layout.line_height * (end_row - start_row + 1) as f32,
256 );
257 cx.scene.push_quad(Quad {
258 bounds: RectF::new(origin, size),
259 background: Some(self.style.active_line_background),
260 border: Border::default(),
261 corner_radius: 0.,
262 });
263 }
264 }
265
266 if let Some(highlighted_rows) = &layout.highlighted_rows {
267 let origin = vec2f(
268 bounds.origin_x(),
269 bounds.origin_y() + (layout.line_height * highlighted_rows.start as f32)
270 - scroll_top,
271 );
272 let size = vec2f(
273 bounds.width(),
274 layout.line_height * highlighted_rows.len() as f32,
275 );
276 cx.scene.push_quad(Quad {
277 bounds: RectF::new(origin, size),
278 background: Some(self.style.highlighted_line_background),
279 border: Border::default(),
280 corner_radius: 0.,
281 });
282 }
283 }
284 }
285
286 fn paint_gutter(
287 &mut self,
288 bounds: RectF,
289 visible_bounds: RectF,
290 layout: &mut LayoutState,
291 cx: &mut PaintContext,
292 ) {
293 let scroll_top = layout.snapshot.scroll_position().y() * layout.line_height;
294 for (ix, line) in layout.line_number_layouts.iter().enumerate() {
295 if let Some(line) = line {
296 let line_origin = bounds.origin()
297 + vec2f(
298 bounds.width() - line.width() - layout.gutter_padding,
299 ix as f32 * layout.line_height - (scroll_top % layout.line_height),
300 );
301 line.paint(line_origin, visible_bounds, layout.line_height, cx);
302 }
303 }
304
305 if let Some((row, indicator)) = layout.code_actions_indicator.as_mut() {
306 let mut x = bounds.width() - layout.gutter_padding;
307 let mut y = *row as f32 * layout.line_height - scroll_top;
308 x += ((layout.gutter_padding + layout.gutter_margin) - indicator.size().x()) / 2.;
309 y += (layout.line_height - indicator.size().y()) / 2.;
310 indicator.paint(bounds.origin() + vec2f(x, y), visible_bounds, cx);
311 }
312 }
313
314 fn paint_text(
315 &mut self,
316 bounds: RectF,
317 visible_bounds: RectF,
318 layout: &mut LayoutState,
319 cx: &mut PaintContext,
320 ) {
321 let view = self.view(cx.app);
322 let style = &self.style;
323 let local_replica_id = view.replica_id(cx);
324 let scroll_position = layout.snapshot.scroll_position();
325 let start_row = scroll_position.y() as u32;
326 let scroll_top = scroll_position.y() * layout.line_height;
327 let end_row = ((scroll_top + bounds.height()) / layout.line_height).ceil() as u32 + 1; // Add 1 to ensure selections bleed off screen
328 let max_glyph_width = layout.em_width;
329 let scroll_left = scroll_position.x() * max_glyph_width;
330 let content_origin = bounds.origin() + vec2f(layout.gutter_margin, 0.);
331
332 cx.scene.push_layer(Some(bounds));
333 cx.scene.push_cursor_style(bounds, CursorStyle::IBeam);
334
335 for (range, color) in &layout.highlighted_ranges {
336 self.paint_highlighted_range(
337 range.clone(),
338 start_row,
339 end_row,
340 *color,
341 0.,
342 0.15 * layout.line_height,
343 layout,
344 content_origin,
345 scroll_top,
346 scroll_left,
347 bounds,
348 false,
349 cx,
350 );
351 }
352
353 let mut cursors = SmallVec::<[Cursor; 32]>::new();
354 for ((replica_id, line_mode), selections) in &layout.selections {
355 let selection_style = style.replica_selection_style(*replica_id);
356 let corner_radius = 0.15 * layout.line_height;
357
358 for selection in selections {
359 self.paint_highlighted_range(
360 selection.start..selection.end,
361 start_row,
362 end_row,
363 selection_style.selection,
364 corner_radius,
365 corner_radius * 2.,
366 layout,
367 content_origin,
368 scroll_top,
369 scroll_left,
370 bounds,
371 *line_mode,
372 cx,
373 );
374
375 if view.show_local_cursors() || *replica_id != local_replica_id {
376 let cursor_position = selection.head();
377 if (start_row..end_row).contains(&cursor_position.row()) {
378 let cursor_row_layout =
379 &layout.line_layouts[(cursor_position.row() - start_row) as usize];
380 let cursor_column = cursor_position.column() as usize;
381
382 let cursor_character_x = cursor_row_layout.x_for_index(cursor_column);
383 let mut block_width =
384 cursor_row_layout.x_for_index(cursor_column + 1) - cursor_character_x;
385 if block_width == 0.0 {
386 block_width = layout.em_width;
387 }
388
389 let block_text =
390 if matches!(self.cursor_shape, CursorShape::Block) {
391 layout.snapshot.chars_at(cursor_position).next().and_then(
392 |character| {
393 let font_id =
394 cursor_row_layout.font_for_index(cursor_column)?;
395 let text = character.to_string();
396
397 Some(cx.text_layout_cache.layout_str(
398 &text,
399 cursor_row_layout.font_size(),
400 &[(
401 text.len(),
402 RunStyle {
403 font_id,
404 color: style.background,
405 underline: Default::default(),
406 },
407 )],
408 ))
409 },
410 )
411 } else {
412 None
413 };
414
415 let x = cursor_character_x - scroll_left;
416 let y = cursor_position.row() as f32 * layout.line_height - scroll_top;
417 cursors.push(Cursor {
418 color: selection_style.cursor,
419 block_width,
420 origin: content_origin + vec2f(x, y),
421 line_height: layout.line_height,
422 shape: self.cursor_shape,
423 block_text,
424 });
425 }
426 }
427 }
428 }
429
430 if let Some(visible_text_bounds) = bounds.intersection(visible_bounds) {
431 // Draw glyphs
432 for (ix, line) in layout.line_layouts.iter().enumerate() {
433 let row = start_row + ix as u32;
434 line.paint(
435 content_origin
436 + vec2f(-scroll_left, row as f32 * layout.line_height - scroll_top),
437 visible_text_bounds,
438 layout.line_height,
439 cx,
440 );
441 }
442 }
443
444 cx.scene.push_layer(Some(bounds));
445 for cursor in cursors {
446 cursor.paint(cx);
447 }
448 cx.scene.pop_layer();
449
450 if let Some((position, context_menu)) = layout.context_menu.as_mut() {
451 cx.scene.push_stacking_context(None);
452
453 let cursor_row_layout = &layout.line_layouts[(position.row() - start_row) as usize];
454 let x = cursor_row_layout.x_for_index(position.column() as usize) - scroll_left;
455 let y = (position.row() + 1) as f32 * layout.line_height - scroll_top;
456 let mut list_origin = content_origin + vec2f(x, y);
457 let list_height = context_menu.size().y();
458
459 if list_origin.y() + list_height > bounds.lower_left().y() {
460 list_origin.set_y(list_origin.y() - layout.line_height - list_height);
461 }
462
463 context_menu.paint(
464 list_origin,
465 RectF::from_points(Vector2F::zero(), vec2f(f32::MAX, f32::MAX)), // Let content bleed outside of editor
466 cx,
467 );
468
469 cx.scene.pop_stacking_context();
470 }
471
472 cx.scene.pop_layer();
473 }
474
475 fn paint_highlighted_range(
476 &self,
477 range: Range<DisplayPoint>,
478 start_row: u32,
479 end_row: u32,
480 color: Color,
481 corner_radius: f32,
482 line_end_overshoot: f32,
483 layout: &LayoutState,
484 content_origin: Vector2F,
485 scroll_top: f32,
486 scroll_left: f32,
487 bounds: RectF,
488 line_mode: bool,
489 cx: &mut PaintContext,
490 ) {
491 if range.start != range.end || line_mode {
492 let row_range = if range.end.column() == 0 && !line_mode {
493 cmp::max(range.start.row(), start_row)..cmp::min(range.end.row(), end_row)
494 } else {
495 cmp::max(range.start.row(), start_row)..cmp::min(range.end.row() + 1, end_row)
496 };
497
498 let highlighted_range = HighlightedRange {
499 color,
500 line_height: layout.line_height,
501 corner_radius,
502 start_y: content_origin.y() + row_range.start as f32 * layout.line_height
503 - scroll_top,
504 lines: row_range
505 .into_iter()
506 .map(|row| {
507 let line_layout = &layout.line_layouts[(row - start_row) as usize];
508 HighlightedRangeLine {
509 start_x: if row == range.start.row() && !line_mode {
510 content_origin.x()
511 + line_layout.x_for_index(range.start.column() as usize)
512 - scroll_left
513 } else {
514 content_origin.x() - scroll_left
515 },
516 end_x: if row == range.end.row() && !line_mode {
517 content_origin.x()
518 + line_layout.x_for_index(range.end.column() as usize)
519 - scroll_left
520 } else {
521 content_origin.x() + line_layout.width() + line_end_overshoot
522 - scroll_left
523 },
524 }
525 })
526 .collect(),
527 };
528
529 highlighted_range.paint(bounds, cx.scene);
530 }
531 }
532
533 fn paint_blocks(
534 &mut self,
535 bounds: RectF,
536 visible_bounds: RectF,
537 layout: &mut LayoutState,
538 cx: &mut PaintContext,
539 ) {
540 let scroll_position = layout.snapshot.scroll_position();
541 let scroll_left = scroll_position.x() * layout.em_width;
542 let scroll_top = scroll_position.y() * layout.line_height;
543
544 for (row, element) in &mut layout.blocks {
545 let origin = bounds.origin()
546 + vec2f(-scroll_left, *row as f32 * layout.line_height - scroll_top);
547 element.paint(origin, visible_bounds, cx);
548 }
549 }
550
551 fn max_line_number_width(&self, snapshot: &EditorSnapshot, cx: &LayoutContext) -> f32 {
552 let digit_count = (snapshot.max_buffer_row() as f32).log10().floor() as usize + 1;
553 let style = &self.style;
554
555 cx.text_layout_cache
556 .layout_str(
557 "1".repeat(digit_count).as_str(),
558 style.text.font_size,
559 &[(
560 digit_count,
561 RunStyle {
562 font_id: style.text.font_id,
563 color: Color::black(),
564 underline: Default::default(),
565 },
566 )],
567 )
568 .width()
569 }
570
571 fn layout_line_numbers(
572 &self,
573 rows: Range<u32>,
574 active_rows: &BTreeMap<u32, bool>,
575 snapshot: &EditorSnapshot,
576 cx: &LayoutContext,
577 ) -> Vec<Option<text_layout::Line>> {
578 let style = &self.style;
579 let include_line_numbers = snapshot.mode == EditorMode::Full;
580 let mut line_number_layouts = Vec::with_capacity(rows.len());
581 let mut line_number = String::new();
582 for (ix, row) in snapshot
583 .buffer_rows(rows.start)
584 .take((rows.end - rows.start) as usize)
585 .enumerate()
586 {
587 let display_row = rows.start + ix as u32;
588 let color = if active_rows.contains_key(&display_row) {
589 style.line_number_active
590 } else {
591 style.line_number
592 };
593 if let Some(buffer_row) = row {
594 if include_line_numbers {
595 line_number.clear();
596 write!(&mut line_number, "{}", buffer_row + 1).unwrap();
597 line_number_layouts.push(Some(cx.text_layout_cache.layout_str(
598 &line_number,
599 style.text.font_size,
600 &[(
601 line_number.len(),
602 RunStyle {
603 font_id: style.text.font_id,
604 color,
605 underline: Default::default(),
606 },
607 )],
608 )));
609 }
610 } else {
611 line_number_layouts.push(None);
612 }
613 }
614
615 line_number_layouts
616 }
617
618 fn layout_lines(
619 &mut self,
620 rows: Range<u32>,
621 snapshot: &EditorSnapshot,
622 cx: &LayoutContext,
623 ) -> Vec<text_layout::Line> {
624 if rows.start >= rows.end {
625 return Vec::new();
626 }
627
628 // When the editor is empty and unfocused, then show the placeholder.
629 if snapshot.is_empty() && !snapshot.is_focused() {
630 let placeholder_style = self
631 .style
632 .placeholder_text
633 .as_ref()
634 .unwrap_or_else(|| &self.style.text);
635 let placeholder_text = snapshot.placeholder_text();
636 let placeholder_lines = placeholder_text
637 .as_ref()
638 .map_or("", AsRef::as_ref)
639 .split('\n')
640 .skip(rows.start as usize)
641 .chain(iter::repeat(""))
642 .take(rows.len());
643 return placeholder_lines
644 .map(|line| {
645 cx.text_layout_cache.layout_str(
646 line,
647 placeholder_style.font_size,
648 &[(
649 line.len(),
650 RunStyle {
651 font_id: placeholder_style.font_id,
652 color: placeholder_style.color,
653 underline: Default::default(),
654 },
655 )],
656 )
657 })
658 .collect();
659 } else {
660 let style = &self.style;
661 let chunks = snapshot.chunks(rows.clone(), true).map(|chunk| {
662 let mut highlight_style = chunk
663 .syntax_highlight_id
664 .and_then(|id| id.style(&style.syntax));
665
666 if let Some(chunk_highlight) = chunk.highlight_style {
667 if let Some(highlight_style) = highlight_style.as_mut() {
668 highlight_style.highlight(chunk_highlight);
669 } else {
670 highlight_style = Some(chunk_highlight);
671 }
672 }
673
674 let mut diagnostic_highlight = HighlightStyle::default();
675
676 if chunk.is_unnecessary {
677 diagnostic_highlight.fade_out = Some(style.unnecessary_code_fade);
678 }
679
680 if let Some(severity) = chunk.diagnostic_severity {
681 // Omit underlines for HINT/INFO diagnostics on 'unnecessary' code.
682 if severity <= DiagnosticSeverity::WARNING || !chunk.is_unnecessary {
683 let diagnostic_style = super::diagnostic_style(severity, true, style);
684 diagnostic_highlight.underline = Some(Underline {
685 color: Some(diagnostic_style.message.text.color),
686 thickness: 1.0.into(),
687 squiggly: true,
688 });
689 }
690 }
691
692 if let Some(highlight_style) = highlight_style.as_mut() {
693 highlight_style.highlight(diagnostic_highlight);
694 } else {
695 highlight_style = Some(diagnostic_highlight);
696 }
697
698 (chunk.text, highlight_style)
699 });
700 layout_highlighted_chunks(
701 chunks,
702 &style.text,
703 &cx.text_layout_cache,
704 &cx.font_cache,
705 MAX_LINE_LEN,
706 rows.len() as usize,
707 )
708 }
709 }
710
711 fn layout_blocks(
712 &mut self,
713 rows: Range<u32>,
714 snapshot: &EditorSnapshot,
715 width: f32,
716 gutter_padding: f32,
717 gutter_width: f32,
718 em_width: f32,
719 text_x: f32,
720 line_height: f32,
721 style: &EditorStyle,
722 line_layouts: &[text_layout::Line],
723 cx: &mut LayoutContext,
724 ) -> Vec<(u32, ElementBox)> {
725 let scroll_x = snapshot.scroll_position.x();
726 snapshot
727 .blocks_in_range(rows.clone())
728 .map(|(block_row, block)| {
729 let mut element = match block {
730 TransformBlock::Custom(block) => {
731 let align_to = block
732 .position()
733 .to_point(&snapshot.buffer_snapshot)
734 .to_display_point(snapshot);
735 let anchor_x = text_x
736 + if rows.contains(&align_to.row()) {
737 line_layouts[(align_to.row() - rows.start) as usize]
738 .x_for_index(align_to.column() as usize)
739 } else {
740 layout_line(align_to.row(), snapshot, style, cx.text_layout_cache)
741 .x_for_index(align_to.column() as usize)
742 };
743
744 block.render(&BlockContext {
745 cx,
746 anchor_x,
747 gutter_padding,
748 line_height,
749 scroll_x,
750 gutter_width,
751 em_width,
752 })
753 }
754 TransformBlock::ExcerptHeader {
755 buffer,
756 starts_new_buffer,
757 ..
758 } => {
759 if *starts_new_buffer {
760 let style = &self.style.diagnostic_path_header;
761 let font_size =
762 (style.text_scale_factor * self.style.text.font_size).round();
763
764 let mut filename = None;
765 let mut parent_path = None;
766 if let Some(path) = buffer.path() {
767 filename =
768 path.file_name().map(|f| f.to_string_lossy().to_string());
769 parent_path =
770 path.parent().map(|p| p.to_string_lossy().to_string() + "/");
771 }
772
773 Flex::row()
774 .with_child(
775 Label::new(
776 filename.unwrap_or_else(|| "untitled".to_string()),
777 style.filename.text.clone().with_font_size(font_size),
778 )
779 .contained()
780 .with_style(style.filename.container)
781 .boxed(),
782 )
783 .with_children(parent_path.map(|path| {
784 Label::new(
785 path,
786 style.path.text.clone().with_font_size(font_size),
787 )
788 .contained()
789 .with_style(style.path.container)
790 .boxed()
791 }))
792 .aligned()
793 .left()
794 .contained()
795 .with_style(style.container)
796 .with_padding_left(gutter_padding + scroll_x * em_width)
797 .expanded()
798 .named("path header block")
799 } else {
800 let text_style = self.style.text.clone();
801 Label::new("…".to_string(), text_style)
802 .contained()
803 .with_padding_left(gutter_padding + scroll_x * em_width)
804 .named("collapsed context")
805 }
806 }
807 };
808
809 element.layout(
810 SizeConstraint {
811 min: Vector2F::zero(),
812 max: vec2f(width, block.height() as f32 * line_height),
813 },
814 cx,
815 );
816 (block_row, element)
817 })
818 .collect()
819 }
820}
821
822impl Element for EditorElement {
823 type LayoutState = LayoutState;
824 type PaintState = PaintState;
825
826 fn layout(
827 &mut self,
828 constraint: SizeConstraint,
829 cx: &mut LayoutContext,
830 ) -> (Vector2F, Self::LayoutState) {
831 let mut size = constraint.max;
832 if size.x().is_infinite() {
833 unimplemented!("we don't yet handle an infinite width constraint on buffer elements");
834 }
835
836 let snapshot = self.snapshot(cx.app);
837 let style = self.style.clone();
838 let line_height = style.text.line_height(cx.font_cache);
839
840 let gutter_padding;
841 let gutter_width;
842 let gutter_margin;
843 if snapshot.mode == EditorMode::Full {
844 gutter_padding = style.text.em_width(cx.font_cache) * style.gutter_padding_factor;
845 gutter_width = self.max_line_number_width(&snapshot, cx) + gutter_padding * 2.0;
846 gutter_margin = -style.text.descent(cx.font_cache);
847 } else {
848 gutter_padding = 0.0;
849 gutter_width = 0.0;
850 gutter_margin = 0.0;
851 };
852
853 let text_width = size.x() - gutter_width;
854 let em_width = style.text.em_width(cx.font_cache);
855 let em_advance = style.text.em_advance(cx.font_cache);
856 let overscroll = vec2f(em_width, 0.);
857 let snapshot = self.update_view(cx.app, |view, cx| {
858 let wrap_width = match view.soft_wrap_mode(cx) {
859 SoftWrap::None => Some((MAX_LINE_LEN / 2) as f32 * em_advance),
860 SoftWrap::EditorWidth => {
861 Some(text_width - gutter_margin - overscroll.x() - em_width)
862 }
863 SoftWrap::Column(column) => Some(column as f32 * em_advance),
864 };
865
866 if view.set_wrap_width(wrap_width, cx) {
867 view.snapshot(cx)
868 } else {
869 snapshot
870 }
871 });
872
873 let scroll_height = (snapshot.max_point().row() + 1) as f32 * line_height;
874 if let EditorMode::AutoHeight { max_lines } = snapshot.mode {
875 size.set_y(
876 scroll_height
877 .min(constraint.max_along(Axis::Vertical))
878 .max(constraint.min_along(Axis::Vertical))
879 .min(line_height * max_lines as f32),
880 )
881 } else if let EditorMode::SingleLine = snapshot.mode {
882 size.set_y(
883 line_height
884 .min(constraint.max_along(Axis::Vertical))
885 .max(constraint.min_along(Axis::Vertical)),
886 )
887 } else if size.y().is_infinite() {
888 size.set_y(scroll_height);
889 }
890 let gutter_size = vec2f(gutter_width, size.y());
891 let text_size = vec2f(text_width, size.y());
892
893 let (autoscroll_horizontally, mut snapshot) = self.update_view(cx.app, |view, cx| {
894 let autoscroll_horizontally = view.autoscroll_vertically(size.y(), line_height, cx);
895 let snapshot = view.snapshot(cx);
896 (autoscroll_horizontally, snapshot)
897 });
898
899 let scroll_position = snapshot.scroll_position();
900 let start_row = scroll_position.y() as u32;
901 let scroll_top = scroll_position.y() * line_height;
902
903 // Add 1 to ensure selections bleed off screen
904 let end_row = 1 + cmp::min(
905 ((scroll_top + size.y()) / line_height).ceil() as u32,
906 snapshot.max_point().row(),
907 );
908
909 let start_anchor = if start_row == 0 {
910 Anchor::min()
911 } else {
912 snapshot
913 .buffer_snapshot
914 .anchor_before(DisplayPoint::new(start_row, 0).to_offset(&snapshot, Bias::Left))
915 };
916 let end_anchor = if end_row > snapshot.max_point().row() {
917 Anchor::max()
918 } else {
919 snapshot
920 .buffer_snapshot
921 .anchor_before(DisplayPoint::new(end_row, 0).to_offset(&snapshot, Bias::Right))
922 };
923
924 let mut selections = Vec::new();
925 let mut active_rows = BTreeMap::new();
926 let mut highlighted_rows = None;
927 let mut highlighted_ranges = Vec::new();
928 self.update_view(cx.app, |view, cx| {
929 let display_map = view.display_map.update(cx, |map, cx| map.snapshot(cx));
930
931 highlighted_rows = view.highlighted_rows();
932 let theme = cx.global::<Settings>().theme.as_ref();
933 highlighted_ranges = view.background_highlights_in_range(
934 start_anchor.clone()..end_anchor.clone(),
935 &display_map,
936 theme,
937 );
938
939 let mut remote_selections = HashMap::default();
940 for (replica_id, line_mode, selection) in display_map
941 .buffer_snapshot
942 .remote_selections_in_range(&(start_anchor.clone()..end_anchor.clone()))
943 {
944 // The local selections match the leader's selections.
945 if Some(replica_id) == view.leader_replica_id {
946 continue;
947 }
948
949 remote_selections
950 .entry((replica_id, line_mode))
951 .or_insert(Vec::new())
952 .push(crate::Selection {
953 id: selection.id,
954 goal: selection.goal,
955 reversed: selection.reversed,
956 start: selection.start.to_display_point(&display_map),
957 end: selection.end.to_display_point(&display_map),
958 });
959 }
960 selections.extend(remote_selections);
961
962 if view.show_local_selections {
963 let mut local_selections = view
964 .selections
965 .disjoint_in_range(start_anchor..end_anchor, cx);
966 local_selections.extend(view.selections.pending(cx));
967 for selection in &local_selections {
968 let is_empty = selection.start == selection.end;
969 let selection_start = snapshot.prev_line_boundary(selection.start).1;
970 let selection_end = snapshot.next_line_boundary(selection.end).1;
971 for row in cmp::max(selection_start.row(), start_row)
972 ..=cmp::min(selection_end.row(), end_row)
973 {
974 let contains_non_empty_selection =
975 active_rows.entry(row).or_insert(!is_empty);
976 *contains_non_empty_selection |= !is_empty;
977 }
978 }
979
980 // Render the local selections in the leader's color when following.
981 let local_replica_id = view.leader_replica_id.unwrap_or(view.replica_id(cx));
982
983 selections.push((
984 (local_replica_id, view.selections.line_mode),
985 local_selections
986 .into_iter()
987 .map(|selection| crate::Selection {
988 id: selection.id,
989 goal: selection.goal,
990 reversed: selection.reversed,
991 start: selection.start.to_display_point(&display_map),
992 end: selection.end.to_display_point(&display_map),
993 })
994 .collect(),
995 ));
996 }
997 });
998
999 let line_number_layouts =
1000 self.layout_line_numbers(start_row..end_row, &active_rows, &snapshot, cx);
1001
1002 let mut max_visible_line_width = 0.0;
1003 let line_layouts = self.layout_lines(start_row..end_row, &snapshot, cx);
1004 for line in &line_layouts {
1005 if line.width() > max_visible_line_width {
1006 max_visible_line_width = line.width();
1007 }
1008 }
1009
1010 let style = self.style.clone();
1011 let longest_line_width = layout_line(
1012 snapshot.longest_row(),
1013 &snapshot,
1014 &style,
1015 cx.text_layout_cache,
1016 )
1017 .width();
1018 let scroll_width = longest_line_width.max(max_visible_line_width) + overscroll.x();
1019 let em_width = style.text.em_width(cx.font_cache);
1020 let max_row = snapshot.max_point().row();
1021 let scroll_max = vec2f(
1022 ((scroll_width - text_size.x()) / em_width).max(0.0),
1023 max_row.saturating_sub(1) as f32,
1024 );
1025
1026 let mut context_menu = None;
1027 let mut code_actions_indicator = None;
1028 self.update_view(cx.app, |view, cx| {
1029 let clamped = view.clamp_scroll_left(scroll_max.x());
1030 let autoscrolled;
1031 if autoscroll_horizontally {
1032 autoscrolled = view.autoscroll_horizontally(
1033 start_row,
1034 text_size.x(),
1035 scroll_width,
1036 em_width,
1037 &line_layouts,
1038 cx,
1039 );
1040 } else {
1041 autoscrolled = false;
1042 }
1043
1044 if clamped || autoscrolled {
1045 snapshot = view.snapshot(cx);
1046 }
1047
1048 let newest_selection_head = view
1049 .selections
1050 .newest::<usize>(cx)
1051 .head()
1052 .to_display_point(&snapshot);
1053
1054 if (start_row..end_row).contains(&newest_selection_head.row()) {
1055 let style = view.style(cx);
1056 if view.context_menu_visible() {
1057 context_menu =
1058 view.render_context_menu(newest_selection_head, style.clone(), cx);
1059 }
1060
1061 code_actions_indicator = view
1062 .render_code_actions_indicator(&style, cx)
1063 .map(|indicator| (newest_selection_head.row(), indicator));
1064 }
1065 });
1066
1067 if let Some((_, context_menu)) = context_menu.as_mut() {
1068 context_menu.layout(
1069 SizeConstraint {
1070 min: Vector2F::zero(),
1071 max: vec2f(
1072 f32::INFINITY,
1073 (12. * line_height).min((size.y() - line_height) / 2.),
1074 ),
1075 },
1076 cx,
1077 );
1078 }
1079
1080 if let Some((_, indicator)) = code_actions_indicator.as_mut() {
1081 indicator.layout(
1082 SizeConstraint::strict_along(Axis::Vertical, line_height * 0.618),
1083 cx,
1084 );
1085 }
1086
1087 let blocks = self.layout_blocks(
1088 start_row..end_row,
1089 &snapshot,
1090 size.x().max(scroll_width + gutter_width),
1091 gutter_padding,
1092 gutter_width,
1093 em_width,
1094 gutter_width + gutter_margin,
1095 line_height,
1096 &style,
1097 &line_layouts,
1098 cx,
1099 );
1100
1101 (
1102 size,
1103 LayoutState {
1104 size,
1105 scroll_max,
1106 gutter_size,
1107 gutter_padding,
1108 text_size,
1109 gutter_margin,
1110 snapshot,
1111 active_rows,
1112 highlighted_rows,
1113 highlighted_ranges,
1114 line_layouts,
1115 line_number_layouts,
1116 blocks,
1117 line_height,
1118 em_width,
1119 em_advance,
1120 selections,
1121 context_menu,
1122 code_actions_indicator,
1123 },
1124 )
1125 }
1126
1127 fn paint(
1128 &mut self,
1129 bounds: RectF,
1130 visible_bounds: RectF,
1131 layout: &mut Self::LayoutState,
1132 cx: &mut PaintContext,
1133 ) -> Self::PaintState {
1134 cx.scene.push_layer(Some(bounds));
1135
1136 let gutter_bounds = RectF::new(bounds.origin(), layout.gutter_size);
1137 let text_bounds = RectF::new(
1138 bounds.origin() + vec2f(layout.gutter_size.x(), 0.0),
1139 layout.text_size,
1140 );
1141
1142 self.paint_background(gutter_bounds, text_bounds, layout, cx);
1143 if layout.gutter_size.x() > 0. {
1144 self.paint_gutter(gutter_bounds, visible_bounds, layout, cx);
1145 }
1146 self.paint_text(text_bounds, visible_bounds, layout, cx);
1147
1148 if !layout.blocks.is_empty() {
1149 cx.scene.push_layer(Some(bounds));
1150 self.paint_blocks(bounds, visible_bounds, layout, cx);
1151 cx.scene.pop_layer();
1152 }
1153
1154 cx.scene.pop_layer();
1155
1156 PaintState {
1157 bounds,
1158 gutter_bounds,
1159 text_bounds,
1160 }
1161 }
1162
1163 fn dispatch_event(
1164 &mut self,
1165 event: &Event,
1166 _: RectF,
1167 _: RectF,
1168 layout: &mut LayoutState,
1169 paint: &mut PaintState,
1170 cx: &mut EventContext,
1171 ) -> bool {
1172 if let Some((_, context_menu)) = &mut layout.context_menu {
1173 if context_menu.dispatch_event(event, cx) {
1174 return true;
1175 }
1176 }
1177
1178 if let Some((_, indicator)) = &mut layout.code_actions_indicator {
1179 if indicator.dispatch_event(event, cx) {
1180 return true;
1181 }
1182 }
1183
1184 for (_, block) in &mut layout.blocks {
1185 if block.dispatch_event(event, cx) {
1186 return true;
1187 }
1188 }
1189
1190 match event {
1191 Event::LeftMouseDown {
1192 position,
1193 alt,
1194 shift,
1195 click_count,
1196 ..
1197 } => self.mouse_down(*position, *alt, *shift, *click_count, layout, paint, cx),
1198 Event::LeftMouseUp { position, .. } => self.mouse_up(*position, cx),
1199 Event::LeftMouseDragged { position } => {
1200 self.mouse_dragged(*position, layout, paint, cx)
1201 }
1202 Event::ScrollWheel {
1203 position,
1204 delta,
1205 precise,
1206 } => self.scroll(*position, *delta, *precise, layout, paint, cx),
1207 Event::KeyDown { input, .. } => self.key_down(input.as_deref(), cx),
1208 _ => false,
1209 }
1210 }
1211
1212 fn debug(
1213 &self,
1214 bounds: RectF,
1215 _: &Self::LayoutState,
1216 _: &Self::PaintState,
1217 _: &gpui::DebugContext,
1218 ) -> json::Value {
1219 json!({
1220 "type": "BufferElement",
1221 "bounds": bounds.to_json()
1222 })
1223 }
1224}
1225
1226pub struct LayoutState {
1227 size: Vector2F,
1228 scroll_max: Vector2F,
1229 gutter_size: Vector2F,
1230 gutter_padding: f32,
1231 gutter_margin: f32,
1232 text_size: Vector2F,
1233 snapshot: EditorSnapshot,
1234 active_rows: BTreeMap<u32, bool>,
1235 highlighted_rows: Option<Range<u32>>,
1236 line_layouts: Vec<text_layout::Line>,
1237 line_number_layouts: Vec<Option<text_layout::Line>>,
1238 blocks: Vec<(u32, ElementBox)>,
1239 line_height: f32,
1240 em_width: f32,
1241 em_advance: f32,
1242 highlighted_ranges: Vec<(Range<DisplayPoint>, Color)>,
1243 selections: Vec<((ReplicaId, bool), Vec<text::Selection<DisplayPoint>>)>,
1244 context_menu: Option<(DisplayPoint, ElementBox)>,
1245 code_actions_indicator: Option<(u32, ElementBox)>,
1246}
1247
1248fn layout_line(
1249 row: u32,
1250 snapshot: &EditorSnapshot,
1251 style: &EditorStyle,
1252 layout_cache: &TextLayoutCache,
1253) -> text_layout::Line {
1254 let mut line = snapshot.line(row);
1255
1256 if line.len() > MAX_LINE_LEN {
1257 let mut len = MAX_LINE_LEN;
1258 while !line.is_char_boundary(len) {
1259 len -= 1;
1260 }
1261
1262 line.truncate(len);
1263 }
1264
1265 layout_cache.layout_str(
1266 &line,
1267 style.text.font_size,
1268 &[(
1269 snapshot.line_len(row) as usize,
1270 RunStyle {
1271 font_id: style.text.font_id,
1272 color: Color::black(),
1273 underline: Default::default(),
1274 },
1275 )],
1276 )
1277}
1278
1279pub struct PaintState {
1280 bounds: RectF,
1281 gutter_bounds: RectF,
1282 text_bounds: RectF,
1283}
1284
1285impl PaintState {
1286 fn point_for_position(
1287 &self,
1288 snapshot: &EditorSnapshot,
1289 layout: &LayoutState,
1290 position: Vector2F,
1291 ) -> (DisplayPoint, u32) {
1292 let scroll_position = snapshot.scroll_position();
1293 let position = position - self.text_bounds.origin();
1294 let y = position.y().max(0.0).min(layout.size.y());
1295 let row = ((y / layout.line_height) + scroll_position.y()) as u32;
1296 let row = cmp::min(row, snapshot.max_point().row());
1297 let line = &layout.line_layouts[(row - scroll_position.y() as u32) as usize];
1298 let x = position.x() + (scroll_position.x() * layout.em_width);
1299
1300 let column = if x >= 0.0 {
1301 line.index_for_x(x)
1302 .map(|ix| ix as u32)
1303 .unwrap_or_else(|| snapshot.line_len(row))
1304 } else {
1305 0
1306 };
1307 let overshoot = (0f32.max(x - line.width()) / layout.em_advance) as u32;
1308
1309 (DisplayPoint::new(row, column), overshoot)
1310 }
1311}
1312
1313#[derive(Copy, Clone, PartialEq, Eq)]
1314pub enum CursorShape {
1315 Bar,
1316 Block,
1317 Underscore,
1318}
1319
1320impl Default for CursorShape {
1321 fn default() -> Self {
1322 CursorShape::Bar
1323 }
1324}
1325
1326struct Cursor {
1327 origin: Vector2F,
1328 block_width: f32,
1329 line_height: f32,
1330 color: Color,
1331 shape: CursorShape,
1332 block_text: Option<Line>,
1333}
1334
1335impl Cursor {
1336 fn paint(&self, cx: &mut PaintContext) {
1337 let bounds = match self.shape {
1338 CursorShape::Bar => RectF::new(self.origin, vec2f(2.0, self.line_height)),
1339 CursorShape::Block => {
1340 RectF::new(self.origin, vec2f(self.block_width, self.line_height))
1341 }
1342 CursorShape::Underscore => RectF::new(
1343 self.origin + Vector2F::new(0.0, self.line_height - 2.0),
1344 vec2f(self.block_width, 2.0),
1345 ),
1346 };
1347
1348 cx.scene.push_quad(Quad {
1349 bounds,
1350 background: Some(self.color),
1351 border: Border::new(0., Color::black()),
1352 corner_radius: 0.,
1353 });
1354
1355 if let Some(block_text) = &self.block_text {
1356 block_text.paint(self.origin, bounds, self.line_height, cx);
1357 }
1358 }
1359}
1360
1361#[derive(Debug)]
1362struct HighlightedRange {
1363 start_y: f32,
1364 line_height: f32,
1365 lines: Vec<HighlightedRangeLine>,
1366 color: Color,
1367 corner_radius: f32,
1368}
1369
1370#[derive(Debug)]
1371struct HighlightedRangeLine {
1372 start_x: f32,
1373 end_x: f32,
1374}
1375
1376impl HighlightedRange {
1377 fn paint(&self, bounds: RectF, scene: &mut Scene) {
1378 if self.lines.len() >= 2 && self.lines[0].start_x > self.lines[1].end_x {
1379 self.paint_lines(self.start_y, &self.lines[0..1], bounds, scene);
1380 self.paint_lines(
1381 self.start_y + self.line_height,
1382 &self.lines[1..],
1383 bounds,
1384 scene,
1385 );
1386 } else {
1387 self.paint_lines(self.start_y, &self.lines, bounds, scene);
1388 }
1389 }
1390
1391 fn paint_lines(
1392 &self,
1393 start_y: f32,
1394 lines: &[HighlightedRangeLine],
1395 bounds: RectF,
1396 scene: &mut Scene,
1397 ) {
1398 if lines.is_empty() {
1399 return;
1400 }
1401
1402 let mut path = PathBuilder::new();
1403 let first_line = lines.first().unwrap();
1404 let last_line = lines.last().unwrap();
1405
1406 let first_top_left = vec2f(first_line.start_x, start_y);
1407 let first_top_right = vec2f(first_line.end_x, start_y);
1408
1409 let curve_height = vec2f(0., self.corner_radius);
1410 let curve_width = |start_x: f32, end_x: f32| {
1411 let max = (end_x - start_x) / 2.;
1412 let width = if max < self.corner_radius {
1413 max
1414 } else {
1415 self.corner_radius
1416 };
1417
1418 vec2f(width, 0.)
1419 };
1420
1421 let top_curve_width = curve_width(first_line.start_x, first_line.end_x);
1422 path.reset(first_top_right - top_curve_width);
1423 path.curve_to(first_top_right + curve_height, first_top_right);
1424
1425 let mut iter = lines.iter().enumerate().peekable();
1426 while let Some((ix, line)) = iter.next() {
1427 let bottom_right = vec2f(line.end_x, start_y + (ix + 1) as f32 * self.line_height);
1428
1429 if let Some((_, next_line)) = iter.peek() {
1430 let next_top_right = vec2f(next_line.end_x, bottom_right.y());
1431
1432 match next_top_right.x().partial_cmp(&bottom_right.x()).unwrap() {
1433 Ordering::Equal => {
1434 path.line_to(bottom_right);
1435 }
1436 Ordering::Less => {
1437 let curve_width = curve_width(next_top_right.x(), bottom_right.x());
1438 path.line_to(bottom_right - curve_height);
1439 if self.corner_radius > 0. {
1440 path.curve_to(bottom_right - curve_width, bottom_right);
1441 }
1442 path.line_to(next_top_right + curve_width);
1443 if self.corner_radius > 0. {
1444 path.curve_to(next_top_right + curve_height, next_top_right);
1445 }
1446 }
1447 Ordering::Greater => {
1448 let curve_width = curve_width(bottom_right.x(), next_top_right.x());
1449 path.line_to(bottom_right - curve_height);
1450 if self.corner_radius > 0. {
1451 path.curve_to(bottom_right + curve_width, bottom_right);
1452 }
1453 path.line_to(next_top_right - curve_width);
1454 if self.corner_radius > 0. {
1455 path.curve_to(next_top_right + curve_height, next_top_right);
1456 }
1457 }
1458 }
1459 } else {
1460 let curve_width = curve_width(line.start_x, line.end_x);
1461 path.line_to(bottom_right - curve_height);
1462 if self.corner_radius > 0. {
1463 path.curve_to(bottom_right - curve_width, bottom_right);
1464 }
1465
1466 let bottom_left = vec2f(line.start_x, bottom_right.y());
1467 path.line_to(bottom_left + curve_width);
1468 if self.corner_radius > 0. {
1469 path.curve_to(bottom_left - curve_height, bottom_left);
1470 }
1471 }
1472 }
1473
1474 if first_line.start_x > last_line.start_x {
1475 let curve_width = curve_width(last_line.start_x, first_line.start_x);
1476 let second_top_left = vec2f(last_line.start_x, start_y + self.line_height);
1477 path.line_to(second_top_left + curve_height);
1478 if self.corner_radius > 0. {
1479 path.curve_to(second_top_left + curve_width, second_top_left);
1480 }
1481 let first_bottom_left = vec2f(first_line.start_x, second_top_left.y());
1482 path.line_to(first_bottom_left - curve_width);
1483 if self.corner_radius > 0. {
1484 path.curve_to(first_bottom_left - curve_height, first_bottom_left);
1485 }
1486 }
1487
1488 path.line_to(first_top_left + curve_height);
1489 if self.corner_radius > 0. {
1490 path.curve_to(first_top_left + top_curve_width, first_top_left);
1491 }
1492 path.line_to(first_top_right - top_curve_width);
1493
1494 scene.push_path(path.build(self.color, Some(bounds)));
1495 }
1496}
1497
1498fn scale_vertical_mouse_autoscroll_delta(delta: f32) -> f32 {
1499 delta.powf(1.5) / 100.0
1500}
1501
1502fn scale_horizontal_mouse_autoscroll_delta(delta: f32) -> f32 {
1503 delta.powf(1.2) / 300.0
1504}
1505
1506#[cfg(test)]
1507mod tests {
1508 use std::sync::Arc;
1509
1510 use super::*;
1511 use crate::{
1512 display_map::{BlockDisposition, BlockProperties},
1513 Editor, MultiBuffer,
1514 };
1515 use settings::Settings;
1516 use util::test::sample_text;
1517
1518 #[gpui::test]
1519 fn test_layout_line_numbers(cx: &mut gpui::MutableAppContext) {
1520 cx.set_global(Settings::test(cx));
1521 let buffer = MultiBuffer::build_simple(&sample_text(6, 6, 'a'), cx);
1522 let (window_id, editor) = cx.add_window(Default::default(), |cx| {
1523 Editor::new(EditorMode::Full, buffer, None, None, None, cx)
1524 });
1525 let element = EditorElement::new(
1526 editor.downgrade(),
1527 editor.read(cx).style(cx),
1528 CursorShape::Bar,
1529 );
1530
1531 let layouts = editor.update(cx, |editor, cx| {
1532 let snapshot = editor.snapshot(cx);
1533 let mut presenter = cx.build_presenter(window_id, 30.);
1534 let mut layout_cx = presenter.build_layout_context(false, cx);
1535 element.layout_line_numbers(0..6, &Default::default(), &snapshot, &mut layout_cx)
1536 });
1537 assert_eq!(layouts.len(), 6);
1538 }
1539
1540 #[gpui::test]
1541 fn test_layout_with_placeholder_text_and_blocks(cx: &mut gpui::MutableAppContext) {
1542 cx.set_global(Settings::test(cx));
1543 let buffer = MultiBuffer::build_simple("", cx);
1544 let (window_id, editor) = cx.add_window(Default::default(), |cx| {
1545 Editor::new(EditorMode::Full, buffer, None, None, None, cx)
1546 });
1547
1548 editor.update(cx, |editor, cx| {
1549 editor.set_placeholder_text("hello", cx);
1550 editor.insert_blocks(
1551 [BlockProperties {
1552 disposition: BlockDisposition::Above,
1553 height: 3,
1554 position: Anchor::min(),
1555 render: Arc::new(|_| Empty::new().boxed()),
1556 }],
1557 cx,
1558 );
1559
1560 // Blur the editor so that it displays placeholder text.
1561 cx.blur();
1562 });
1563
1564 let mut element = EditorElement::new(
1565 editor.downgrade(),
1566 editor.read(cx).style(cx),
1567 CursorShape::Bar,
1568 );
1569
1570 let mut scene = Scene::new(1.0);
1571 let mut presenter = cx.build_presenter(window_id, 30.);
1572 let mut layout_cx = presenter.build_layout_context(false, cx);
1573 let (size, mut state) = element.layout(
1574 SizeConstraint::new(vec2f(500., 500.), vec2f(500., 500.)),
1575 &mut layout_cx,
1576 );
1577
1578 assert_eq!(state.line_layouts.len(), 4);
1579 assert_eq!(
1580 state
1581 .line_number_layouts
1582 .iter()
1583 .map(Option::is_some)
1584 .collect::<Vec<_>>(),
1585 &[false, false, false, true]
1586 );
1587
1588 // Don't panic.
1589 let bounds = RectF::new(Default::default(), size);
1590 let mut paint_cx = presenter.build_paint_context(&mut scene, cx);
1591 element.paint(bounds, bounds, &mut state, &mut paint_cx);
1592 }
1593}