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::{
7 display_map::{DisplaySnapshot, TransformBlock},
8 EditorStyle, GoToDefinition, Hover,
9};
10use clock::ReplicaId;
11use collections::{BTreeMap, HashMap};
12use gpui::{
13 color::Color,
14 elements::*,
15 fonts::{HighlightStyle, Underline},
16 geometry::{
17 rect::RectF,
18 vector::{vec2f, Vector2F},
19 PathBuilder,
20 },
21 json::{self, ToJson},
22 platform::CursorStyle,
23 text_layout::{self, Line, RunStyle, TextLayoutCache},
24 AppContext, Axis, Border, CursorRegion, Element, ElementBox, Event, EventContext,
25 LayoutContext, MutableAppContext, PaintContext, Quad, Scene, SizeConstraint, ViewContext,
26 WeakViewHandle,
27};
28use json::json;
29use language::{Bias, DiagnosticSeverity, Selection};
30use settings::Settings;
31use smallvec::SmallVec;
32use std::{
33 cmp::{self, Ordering},
34 fmt::Write,
35 iter,
36 ops::Range,
37};
38
39struct SelectionLayout {
40 head: DisplayPoint,
41 range: Range<DisplayPoint>,
42}
43
44impl SelectionLayout {
45 fn new<T: ToPoint + ToDisplayPoint + Clone>(
46 selection: Selection<T>,
47 line_mode: bool,
48 map: &DisplaySnapshot,
49 ) -> Self {
50 if line_mode {
51 let selection = selection.map(|p| p.to_point(&map.buffer_snapshot));
52 let point_range = map.expand_to_line(selection.range());
53 Self {
54 head: selection.head().to_display_point(map),
55 range: point_range.start.to_display_point(map)
56 ..point_range.end.to_display_point(map),
57 }
58 } else {
59 let selection = selection.map(|p| p.to_display_point(map));
60 Self {
61 head: selection.head(),
62 range: selection.range(),
63 }
64 }
65 }
66}
67
68pub struct EditorElement {
69 view: WeakViewHandle<Editor>,
70 style: EditorStyle,
71 cursor_shape: CursorShape,
72}
73
74impl EditorElement {
75 pub fn new(
76 view: WeakViewHandle<Editor>,
77 style: EditorStyle,
78 cursor_shape: CursorShape,
79 ) -> Self {
80 Self {
81 view,
82 style,
83 cursor_shape,
84 }
85 }
86
87 fn view<'a>(&self, cx: &'a AppContext) -> &'a Editor {
88 self.view.upgrade(cx).unwrap().read(cx)
89 }
90
91 fn update_view<F, T>(&self, cx: &mut MutableAppContext, f: F) -> T
92 where
93 F: FnOnce(&mut Editor, &mut ViewContext<Editor>) -> T,
94 {
95 self.view.upgrade(cx).unwrap().update(cx, f)
96 }
97
98 fn snapshot(&self, cx: &mut MutableAppContext) -> EditorSnapshot {
99 self.update_view(cx, |view, cx| view.snapshot(cx))
100 }
101
102 fn mouse_down(
103 &self,
104 position: Vector2F,
105 cmd: bool,
106 alt: bool,
107 shift: bool,
108 mut click_count: usize,
109 layout: &mut LayoutState,
110 paint: &mut PaintState,
111 cx: &mut EventContext,
112 ) -> bool {
113 if paint.gutter_bounds.contains_point(position) {
114 click_count = 3; // Simulate triple-click when clicking the gutter to select lines
115 } else if !paint.text_bounds.contains_point(position) {
116 return false;
117 }
118
119 let snapshot = self.snapshot(cx.app);
120 let (position, overshoot) = paint.point_for_position(&snapshot, layout, position);
121
122 if cmd {
123 cx.dispatch_action(GoToDefinitionAt {
124 location: Some(position),
125 });
126 } else if shift && alt {
127 cx.dispatch_action(Select(SelectPhase::BeginColumnar {
128 position,
129 overshoot: overshoot.column(),
130 }));
131 } else if shift {
132 cx.dispatch_action(Select(SelectPhase::Extend {
133 position,
134 click_count,
135 }));
136 } else {
137 cx.dispatch_action(Select(SelectPhase::Begin {
138 position,
139 add: alt,
140 click_count,
141 }));
142 }
143
144 true
145 }
146
147 fn mouse_up(&self, _position: Vector2F, cx: &mut EventContext) -> bool {
148 if self.view(cx.app.as_ref()).is_selecting() {
149 cx.dispatch_action(Select(SelectPhase::End));
150 true
151 } else {
152 false
153 }
154 }
155
156 fn mouse_dragged(
157 &self,
158 position: Vector2F,
159 layout: &mut LayoutState,
160 paint: &mut PaintState,
161 cx: &mut EventContext,
162 ) -> bool {
163 let view = self.view(cx.app.as_ref());
164
165 if view.is_selecting() {
166 let rect = paint.text_bounds;
167 let mut scroll_delta = Vector2F::zero();
168
169 let vertical_margin = layout.line_height.min(rect.height() / 3.0);
170 let top = rect.origin_y() + vertical_margin;
171 let bottom = rect.lower_left().y() - vertical_margin;
172 if position.y() < top {
173 scroll_delta.set_y(-scale_vertical_mouse_autoscroll_delta(top - position.y()))
174 }
175 if position.y() > bottom {
176 scroll_delta.set_y(scale_vertical_mouse_autoscroll_delta(position.y() - bottom))
177 }
178
179 let horizontal_margin = layout.line_height.min(rect.width() / 3.0);
180 let left = rect.origin_x() + horizontal_margin;
181 let right = rect.upper_right().x() - horizontal_margin;
182 if position.x() < left {
183 scroll_delta.set_x(-scale_horizontal_mouse_autoscroll_delta(
184 left - position.x(),
185 ))
186 }
187 if position.x() > right {
188 scroll_delta.set_x(scale_horizontal_mouse_autoscroll_delta(
189 position.x() - right,
190 ))
191 }
192
193 let snapshot = self.snapshot(cx.app);
194 let (position, overshoot) = paint.point_for_position(&snapshot, layout, position);
195
196 cx.dispatch_action(Select(SelectPhase::Update {
197 position,
198 overshoot: overshoot.column(),
199 scroll_position: (snapshot.scroll_position() + scroll_delta)
200 .clamp(Vector2F::zero(), layout.scroll_max),
201 }));
202 true
203 } else {
204 false
205 }
206 }
207
208 fn key_down(&self, input: Option<&str>, cx: &mut EventContext) -> bool {
209 let view = self.view.upgrade(cx.app).unwrap();
210
211 if view.is_focused(cx.app) {
212 if let Some(input) = input {
213 cx.dispatch_action(Input(input.to_string()));
214 true
215 } else {
216 false
217 }
218 } else {
219 false
220 }
221 }
222
223 fn scroll(
224 &self,
225 position: Vector2F,
226 mut delta: Vector2F,
227 precise: bool,
228 layout: &mut LayoutState,
229 paint: &mut PaintState,
230 cx: &mut EventContext,
231 ) -> bool {
232 if !paint.bounds.contains_point(position) {
233 return false;
234 }
235
236 let snapshot = self.snapshot(cx.app);
237 let max_glyph_width = layout.em_width;
238 if !precise {
239 delta *= vec2f(max_glyph_width, layout.line_height);
240 }
241
242 let scroll_position = snapshot.scroll_position();
243 let x = (scroll_position.x() * max_glyph_width - delta.x()) / max_glyph_width;
244 let y = (scroll_position.y() * layout.line_height - delta.y()) / layout.line_height;
245 let scroll_position = vec2f(x, y).clamp(Vector2F::zero(), layout.scroll_max);
246
247 cx.dispatch_action(Scroll(scroll_position));
248
249 true
250 }
251
252 fn paint_background(
253 &self,
254 gutter_bounds: RectF,
255 text_bounds: RectF,
256 layout: &LayoutState,
257 cx: &mut PaintContext,
258 ) {
259 let bounds = gutter_bounds.union_rect(text_bounds);
260 let scroll_top = layout.snapshot.scroll_position().y() * layout.line_height;
261 let editor = self.view(cx.app);
262 cx.scene.push_quad(Quad {
263 bounds: gutter_bounds,
264 background: Some(self.style.gutter_background),
265 border: Border::new(0., Color::transparent_black()),
266 corner_radius: 0.,
267 });
268 cx.scene.push_quad(Quad {
269 bounds: text_bounds,
270 background: Some(self.style.background),
271 border: Border::new(0., Color::transparent_black()),
272 corner_radius: 0.,
273 });
274
275 if let EditorMode::Full = editor.mode {
276 let mut active_rows = layout.active_rows.iter().peekable();
277 while let Some((start_row, contains_non_empty_selection)) = active_rows.next() {
278 let mut end_row = *start_row;
279 while active_rows.peek().map_or(false, |r| {
280 *r.0 == end_row + 1 && r.1 == contains_non_empty_selection
281 }) {
282 active_rows.next().unwrap();
283 end_row += 1;
284 }
285
286 if !contains_non_empty_selection {
287 let origin = vec2f(
288 bounds.origin_x(),
289 bounds.origin_y() + (layout.line_height * *start_row as f32) - scroll_top,
290 );
291 let size = vec2f(
292 bounds.width(),
293 layout.line_height * (end_row - start_row + 1) as f32,
294 );
295 cx.scene.push_quad(Quad {
296 bounds: RectF::new(origin, size),
297 background: Some(self.style.active_line_background),
298 border: Border::default(),
299 corner_radius: 0.,
300 });
301 }
302 }
303
304 if let Some(highlighted_rows) = &layout.highlighted_rows {
305 let origin = vec2f(
306 bounds.origin_x(),
307 bounds.origin_y() + (layout.line_height * highlighted_rows.start as f32)
308 - scroll_top,
309 );
310 let size = vec2f(
311 bounds.width(),
312 layout.line_height * highlighted_rows.len() as f32,
313 );
314 cx.scene.push_quad(Quad {
315 bounds: RectF::new(origin, size),
316 background: Some(self.style.highlighted_line_background),
317 border: Border::default(),
318 corner_radius: 0.,
319 });
320 }
321 }
322 }
323
324 fn paint_gutter(
325 &mut self,
326 bounds: RectF,
327 visible_bounds: RectF,
328 layout: &mut LayoutState,
329 cx: &mut PaintContext,
330 ) {
331 let scroll_top = layout.snapshot.scroll_position().y() * layout.line_height;
332 for (ix, line) in layout.line_number_layouts.iter().enumerate() {
333 if let Some(line) = line {
334 let line_origin = bounds.origin()
335 + vec2f(
336 bounds.width() - line.width() - layout.gutter_padding,
337 ix as f32 * layout.line_height - (scroll_top % layout.line_height),
338 );
339 line.paint(line_origin, visible_bounds, layout.line_height, cx);
340 }
341 }
342
343 if let Some((row, indicator)) = layout.code_actions_indicator.as_mut() {
344 let mut x = bounds.width() - layout.gutter_padding;
345 let mut y = *row as f32 * layout.line_height - scroll_top;
346 x += ((layout.gutter_padding + layout.gutter_margin) - indicator.size().x()) / 2.;
347 y += (layout.line_height - indicator.size().y()) / 2.;
348 indicator.paint(bounds.origin() + vec2f(x, y), visible_bounds, cx);
349 }
350 }
351
352 fn paint_text(
353 &mut self,
354 bounds: RectF,
355 visible_bounds: RectF,
356 layout: &mut LayoutState,
357 cx: &mut PaintContext,
358 ) {
359 let view = self.view(cx.app);
360 let style = &self.style;
361 let local_replica_id = view.replica_id(cx);
362 let scroll_position = layout.snapshot.scroll_position();
363 let start_row = scroll_position.y() as u32;
364 let scroll_top = scroll_position.y() * layout.line_height;
365 let end_row = ((scroll_top + bounds.height()) / layout.line_height).ceil() as u32 + 1; // Add 1 to ensure selections bleed off screen
366 let max_glyph_width = layout.em_width;
367 let scroll_left = scroll_position.x() * max_glyph_width;
368 let content_origin = bounds.origin() + vec2f(layout.gutter_margin, 0.);
369
370 cx.scene.push_layer(Some(bounds));
371 cx.scene.push_cursor_region(CursorRegion {
372 bounds,
373 style: CursorStyle::IBeam,
374 });
375
376 for (range, color) in &layout.highlighted_ranges {
377 self.paint_highlighted_range(
378 range.clone(),
379 start_row,
380 end_row,
381 *color,
382 0.,
383 0.15 * layout.line_height,
384 layout,
385 content_origin,
386 scroll_top,
387 scroll_left,
388 bounds,
389 cx,
390 );
391 }
392
393 let mut cursors = SmallVec::<[Cursor; 32]>::new();
394 for (replica_id, selections) in &layout.selections {
395 let selection_style = style.replica_selection_style(*replica_id);
396 let corner_radius = 0.15 * layout.line_height;
397
398 for selection in selections {
399 self.paint_highlighted_range(
400 selection.range.clone(),
401 start_row,
402 end_row,
403 selection_style.selection,
404 corner_radius,
405 corner_radius * 2.,
406 layout,
407 content_origin,
408 scroll_top,
409 scroll_left,
410 bounds,
411 cx,
412 );
413
414 if view.show_local_cursors() || *replica_id != local_replica_id {
415 let cursor_position = selection.head;
416 if (start_row..end_row).contains(&cursor_position.row()) {
417 let cursor_row_layout =
418 &layout.line_layouts[(cursor_position.row() - start_row) as usize];
419 let cursor_column = cursor_position.column() as usize;
420
421 let cursor_character_x = cursor_row_layout.x_for_index(cursor_column);
422 let mut block_width =
423 cursor_row_layout.x_for_index(cursor_column + 1) - cursor_character_x;
424 if block_width == 0.0 {
425 block_width = layout.em_width;
426 }
427
428 let block_text =
429 if matches!(self.cursor_shape, CursorShape::Block) {
430 layout.snapshot.chars_at(cursor_position).next().and_then(
431 |character| {
432 let font_id =
433 cursor_row_layout.font_for_index(cursor_column)?;
434 let text = character.to_string();
435
436 Some(cx.text_layout_cache.layout_str(
437 &text,
438 cursor_row_layout.font_size(),
439 &[(
440 text.len(),
441 RunStyle {
442 font_id,
443 color: style.background,
444 underline: Default::default(),
445 },
446 )],
447 ))
448 },
449 )
450 } else {
451 None
452 };
453
454 let x = cursor_character_x - scroll_left;
455 let y = cursor_position.row() as f32 * layout.line_height - scroll_top;
456 cursors.push(Cursor {
457 color: selection_style.cursor,
458 block_width,
459 origin: content_origin + vec2f(x, y),
460 line_height: layout.line_height,
461 shape: self.cursor_shape,
462 block_text,
463 });
464 }
465 }
466 }
467 }
468
469 if let Some(visible_text_bounds) = bounds.intersection(visible_bounds) {
470 // Draw glyphs
471 for (ix, line) in layout.line_layouts.iter().enumerate() {
472 let row = start_row + ix as u32;
473 line.paint(
474 content_origin
475 + vec2f(-scroll_left, row as f32 * layout.line_height - scroll_top),
476 visible_text_bounds,
477 layout.line_height,
478 cx,
479 );
480 }
481 }
482
483 cx.scene.push_layer(Some(bounds));
484 for cursor in cursors {
485 cursor.paint(cx);
486 }
487 cx.scene.pop_layer();
488
489 if let Some((position, context_menu)) = layout.context_menu.as_mut() {
490 cx.scene.push_stacking_context(None);
491
492 let cursor_row_layout = &layout.line_layouts[(position.row() - start_row) as usize];
493 let x = cursor_row_layout.x_for_index(position.column() as usize) - scroll_left;
494 let y = (position.row() + 1) as f32 * layout.line_height - scroll_top;
495 let mut list_origin = content_origin + vec2f(x, y);
496 let list_height = context_menu.size().y();
497
498 if list_origin.y() + list_height > bounds.max_y() {
499 list_origin.set_y(list_origin.y() - layout.line_height - list_height);
500 }
501
502 context_menu.paint(
503 list_origin,
504 RectF::from_points(Vector2F::zero(), vec2f(f32::MAX, f32::MAX)), // Let content bleed outside of editor
505 cx,
506 );
507
508 cx.scene.pop_stacking_context();
509 }
510
511 if let Some((position, hover_popover)) = layout.hover.as_mut() {
512 if position.row() >= start_row {
513 if let Some(cursor_row_layout) = &layout
514 .line_layouts
515 .get((position.row() - start_row) as usize)
516 {
517 cx.scene.push_stacking_context(None);
518
519 let size = hover_popover.size();
520 let x = cursor_row_layout.x_for_index(position.column() as usize) - scroll_left;
521 let y = position.row() as f32 * layout.line_height - scroll_top - size.y();
522 let mut popover_origin = content_origin + vec2f(x, y);
523
524 if popover_origin.y() < 0.0 {
525 popover_origin.set_y(popover_origin.y() + layout.line_height + size.y());
526 }
527
528 let x_out_of_bounds = bounds.max_x() - (popover_origin.x() + size.x());
529 if x_out_of_bounds < 0.0 {
530 popover_origin.set_x(popover_origin.x() + x_out_of_bounds);
531 }
532
533 hover_popover.paint(
534 popover_origin,
535 RectF::from_points(Vector2F::zero(), vec2f(f32::MAX, f32::MAX)), // Let content bleed outside of editor
536 cx,
537 );
538
539 cx.scene.pop_stacking_context();
540 }
541 }
542 }
543
544 cx.scene.pop_layer();
545 }
546
547 fn paint_highlighted_range(
548 &self,
549 range: Range<DisplayPoint>,
550 start_row: u32,
551 end_row: u32,
552 color: Color,
553 corner_radius: f32,
554 line_end_overshoot: f32,
555 layout: &LayoutState,
556 content_origin: Vector2F,
557 scroll_top: f32,
558 scroll_left: f32,
559 bounds: RectF,
560 cx: &mut PaintContext,
561 ) {
562 if range.start != range.end {
563 let row_range = if range.end.column() == 0 {
564 cmp::max(range.start.row(), start_row)..cmp::min(range.end.row(), end_row)
565 } else {
566 cmp::max(range.start.row(), start_row)..cmp::min(range.end.row() + 1, end_row)
567 };
568
569 let highlighted_range = HighlightedRange {
570 color,
571 line_height: layout.line_height,
572 corner_radius,
573 start_y: content_origin.y() + row_range.start as f32 * layout.line_height
574 - scroll_top,
575 lines: row_range
576 .into_iter()
577 .map(|row| {
578 let line_layout = &layout.line_layouts[(row - start_row) as usize];
579 HighlightedRangeLine {
580 start_x: if row == range.start.row() {
581 content_origin.x()
582 + line_layout.x_for_index(range.start.column() as usize)
583 - scroll_left
584 } else {
585 content_origin.x() - scroll_left
586 },
587 end_x: if row == range.end.row() {
588 content_origin.x()
589 + line_layout.x_for_index(range.end.column() as usize)
590 - scroll_left
591 } else {
592 content_origin.x() + line_layout.width() + line_end_overshoot
593 - scroll_left
594 },
595 }
596 })
597 .collect(),
598 };
599
600 highlighted_range.paint(bounds, cx.scene);
601 }
602 }
603
604 fn paint_blocks(
605 &mut self,
606 bounds: RectF,
607 visible_bounds: RectF,
608 layout: &mut LayoutState,
609 cx: &mut PaintContext,
610 ) {
611 let scroll_position = layout.snapshot.scroll_position();
612 let scroll_left = scroll_position.x() * layout.em_width;
613 let scroll_top = scroll_position.y() * layout.line_height;
614
615 for (row, element) in &mut layout.blocks {
616 let origin = bounds.origin()
617 + vec2f(-scroll_left, *row as f32 * layout.line_height - scroll_top);
618 element.paint(origin, visible_bounds, cx);
619 }
620 }
621
622 fn max_line_number_width(&self, snapshot: &EditorSnapshot, cx: &LayoutContext) -> f32 {
623 let digit_count = (snapshot.max_buffer_row() as f32).log10().floor() as usize + 1;
624 let style = &self.style;
625
626 cx.text_layout_cache
627 .layout_str(
628 "1".repeat(digit_count).as_str(),
629 style.text.font_size,
630 &[(
631 digit_count,
632 RunStyle {
633 font_id: style.text.font_id,
634 color: Color::black(),
635 underline: Default::default(),
636 },
637 )],
638 )
639 .width()
640 }
641
642 fn layout_line_numbers(
643 &self,
644 rows: Range<u32>,
645 active_rows: &BTreeMap<u32, bool>,
646 snapshot: &EditorSnapshot,
647 cx: &LayoutContext,
648 ) -> Vec<Option<text_layout::Line>> {
649 let style = &self.style;
650 let include_line_numbers = snapshot.mode == EditorMode::Full;
651 let mut line_number_layouts = Vec::with_capacity(rows.len());
652 let mut line_number = String::new();
653 for (ix, row) in snapshot
654 .buffer_rows(rows.start)
655 .take((rows.end - rows.start) as usize)
656 .enumerate()
657 {
658 let display_row = rows.start + ix as u32;
659 let color = if active_rows.contains_key(&display_row) {
660 style.line_number_active
661 } else {
662 style.line_number
663 };
664 if let Some(buffer_row) = row {
665 if include_line_numbers {
666 line_number.clear();
667 write!(&mut line_number, "{}", buffer_row + 1).unwrap();
668 line_number_layouts.push(Some(cx.text_layout_cache.layout_str(
669 &line_number,
670 style.text.font_size,
671 &[(
672 line_number.len(),
673 RunStyle {
674 font_id: style.text.font_id,
675 color,
676 underline: Default::default(),
677 },
678 )],
679 )));
680 }
681 } else {
682 line_number_layouts.push(None);
683 }
684 }
685
686 line_number_layouts
687 }
688
689 fn layout_lines(
690 &mut self,
691 rows: Range<u32>,
692 snapshot: &EditorSnapshot,
693 cx: &LayoutContext,
694 ) -> Vec<text_layout::Line> {
695 if rows.start >= rows.end {
696 return Vec::new();
697 }
698
699 // When the editor is empty and unfocused, then show the placeholder.
700 if snapshot.is_empty() && !snapshot.is_focused() {
701 let placeholder_style = self
702 .style
703 .placeholder_text
704 .as_ref()
705 .unwrap_or_else(|| &self.style.text);
706 let placeholder_text = snapshot.placeholder_text();
707 let placeholder_lines = placeholder_text
708 .as_ref()
709 .map_or("", AsRef::as_ref)
710 .split('\n')
711 .skip(rows.start as usize)
712 .chain(iter::repeat(""))
713 .take(rows.len());
714 return placeholder_lines
715 .map(|line| {
716 cx.text_layout_cache.layout_str(
717 line,
718 placeholder_style.font_size,
719 &[(
720 line.len(),
721 RunStyle {
722 font_id: placeholder_style.font_id,
723 color: placeholder_style.color,
724 underline: Default::default(),
725 },
726 )],
727 )
728 })
729 .collect();
730 } else {
731 let style = &self.style;
732 let chunks = snapshot.chunks(rows.clone(), true).map(|chunk| {
733 let mut highlight_style = chunk
734 .syntax_highlight_id
735 .and_then(|id| id.style(&style.syntax));
736
737 if let Some(chunk_highlight) = chunk.highlight_style {
738 if let Some(highlight_style) = highlight_style.as_mut() {
739 highlight_style.highlight(chunk_highlight);
740 } else {
741 highlight_style = Some(chunk_highlight);
742 }
743 }
744
745 let mut diagnostic_highlight = HighlightStyle::default();
746
747 if chunk.is_unnecessary {
748 diagnostic_highlight.fade_out = Some(style.unnecessary_code_fade);
749 }
750
751 if let Some(severity) = chunk.diagnostic_severity {
752 // Omit underlines for HINT/INFO diagnostics on 'unnecessary' code.
753 if severity <= DiagnosticSeverity::WARNING || !chunk.is_unnecessary {
754 let diagnostic_style = super::diagnostic_style(severity, true, style);
755 diagnostic_highlight.underline = Some(Underline {
756 color: Some(diagnostic_style.message.text.color),
757 thickness: 1.0.into(),
758 squiggly: true,
759 });
760 }
761 }
762
763 if let Some(highlight_style) = highlight_style.as_mut() {
764 highlight_style.highlight(diagnostic_highlight);
765 } else {
766 highlight_style = Some(diagnostic_highlight);
767 }
768
769 (chunk.text, highlight_style)
770 });
771 layout_highlighted_chunks(
772 chunks,
773 &style.text,
774 &cx.text_layout_cache,
775 &cx.font_cache,
776 MAX_LINE_LEN,
777 rows.len() as usize,
778 )
779 }
780 }
781
782 fn layout_blocks(
783 &mut self,
784 rows: Range<u32>,
785 snapshot: &EditorSnapshot,
786 width: f32,
787 gutter_padding: f32,
788 gutter_width: f32,
789 em_width: f32,
790 text_x: f32,
791 line_height: f32,
792 style: &EditorStyle,
793 line_layouts: &[text_layout::Line],
794 cx: &mut LayoutContext,
795 ) -> Vec<(u32, ElementBox)> {
796 let editor = if let Some(editor) = self.view.upgrade(cx) {
797 editor
798 } else {
799 return Default::default();
800 };
801
802 let scroll_x = snapshot.scroll_position.x();
803 snapshot
804 .blocks_in_range(rows.clone())
805 .map(|(block_row, block)| {
806 let mut element = match block {
807 TransformBlock::Custom(block) => {
808 let align_to = block
809 .position()
810 .to_point(&snapshot.buffer_snapshot)
811 .to_display_point(snapshot);
812 let anchor_x = text_x
813 + if rows.contains(&align_to.row()) {
814 line_layouts[(align_to.row() - rows.start) as usize]
815 .x_for_index(align_to.column() as usize)
816 } else {
817 layout_line(align_to.row(), snapshot, style, cx.text_layout_cache)
818 .x_for_index(align_to.column() as usize)
819 };
820
821 cx.render(&editor, |_, cx| {
822 block.render(&mut BlockContext {
823 cx,
824 anchor_x,
825 gutter_padding,
826 line_height,
827 scroll_x,
828 gutter_width,
829 em_width,
830 })
831 })
832 }
833 TransformBlock::ExcerptHeader {
834 buffer,
835 starts_new_buffer,
836 ..
837 } => {
838 if *starts_new_buffer {
839 let style = &self.style.diagnostic_path_header;
840 let font_size =
841 (style.text_scale_factor * self.style.text.font_size).round();
842
843 let mut filename = None;
844 let mut parent_path = None;
845 if let Some(path) = buffer.path() {
846 filename =
847 path.file_name().map(|f| f.to_string_lossy().to_string());
848 parent_path =
849 path.parent().map(|p| p.to_string_lossy().to_string() + "/");
850 }
851
852 Flex::row()
853 .with_child(
854 Label::new(
855 filename.unwrap_or_else(|| "untitled".to_string()),
856 style.filename.text.clone().with_font_size(font_size),
857 )
858 .contained()
859 .with_style(style.filename.container)
860 .boxed(),
861 )
862 .with_children(parent_path.map(|path| {
863 Label::new(
864 path,
865 style.path.text.clone().with_font_size(font_size),
866 )
867 .contained()
868 .with_style(style.path.container)
869 .boxed()
870 }))
871 .aligned()
872 .left()
873 .contained()
874 .with_style(style.container)
875 .with_padding_left(gutter_padding + scroll_x * em_width)
876 .expanded()
877 .named("path header block")
878 } else {
879 let text_style = self.style.text.clone();
880 Label::new("…".to_string(), text_style)
881 .contained()
882 .with_padding_left(gutter_padding + scroll_x * em_width)
883 .named("collapsed context")
884 }
885 }
886 };
887
888 element.layout(
889 SizeConstraint {
890 min: Vector2F::zero(),
891 max: vec2f(width, block.height() as f32 * line_height),
892 },
893 cx,
894 );
895 (block_row, element)
896 })
897 .collect()
898 }
899}
900
901impl Element for EditorElement {
902 type LayoutState = LayoutState;
903 type PaintState = PaintState;
904
905 fn layout(
906 &mut self,
907 constraint: SizeConstraint,
908 cx: &mut LayoutContext,
909 ) -> (Vector2F, Self::LayoutState) {
910 let mut size = constraint.max;
911 if size.x().is_infinite() {
912 unimplemented!("we don't yet handle an infinite width constraint on buffer elements");
913 }
914
915 let snapshot = self.snapshot(cx.app);
916 let style = self.style.clone();
917 let line_height = style.text.line_height(cx.font_cache);
918
919 let gutter_padding;
920 let gutter_width;
921 let gutter_margin;
922 if snapshot.mode == EditorMode::Full {
923 gutter_padding = style.text.em_width(cx.font_cache) * style.gutter_padding_factor;
924 gutter_width = self.max_line_number_width(&snapshot, cx) + gutter_padding * 2.0;
925 gutter_margin = -style.text.descent(cx.font_cache);
926 } else {
927 gutter_padding = 0.0;
928 gutter_width = 0.0;
929 gutter_margin = 0.0;
930 };
931
932 let text_width = size.x() - gutter_width;
933 let em_width = style.text.em_width(cx.font_cache);
934 let em_advance = style.text.em_advance(cx.font_cache);
935 let overscroll = vec2f(em_width, 0.);
936 let snapshot = self.update_view(cx.app, |view, cx| {
937 let wrap_width = match view.soft_wrap_mode(cx) {
938 SoftWrap::None => Some((MAX_LINE_LEN / 2) as f32 * em_advance),
939 SoftWrap::EditorWidth => {
940 Some(text_width - gutter_margin - overscroll.x() - em_width)
941 }
942 SoftWrap::Column(column) => Some(column as f32 * em_advance),
943 };
944
945 if view.set_wrap_width(wrap_width, cx) {
946 view.snapshot(cx)
947 } else {
948 snapshot
949 }
950 });
951
952 let scroll_height = (snapshot.max_point().row() + 1) as f32 * line_height;
953 if let EditorMode::AutoHeight { max_lines } = snapshot.mode {
954 size.set_y(
955 scroll_height
956 .min(constraint.max_along(Axis::Vertical))
957 .max(constraint.min_along(Axis::Vertical))
958 .min(line_height * max_lines as f32),
959 )
960 } else if let EditorMode::SingleLine = snapshot.mode {
961 size.set_y(
962 line_height
963 .min(constraint.max_along(Axis::Vertical))
964 .max(constraint.min_along(Axis::Vertical)),
965 )
966 } else if size.y().is_infinite() {
967 size.set_y(scroll_height);
968 }
969 let gutter_size = vec2f(gutter_width, size.y());
970 let text_size = vec2f(text_width, size.y());
971
972 let (autoscroll_horizontally, mut snapshot) = self.update_view(cx.app, |view, cx| {
973 let autoscroll_horizontally = view.autoscroll_vertically(size.y(), line_height, cx);
974 let snapshot = view.snapshot(cx);
975 (autoscroll_horizontally, snapshot)
976 });
977
978 let scroll_position = snapshot.scroll_position();
979 let start_row = scroll_position.y() as u32;
980 let scroll_top = scroll_position.y() * line_height;
981
982 // Add 1 to ensure selections bleed off screen
983 let end_row = 1 + cmp::min(
984 ((scroll_top + size.y()) / line_height).ceil() as u32,
985 snapshot.max_point().row(),
986 );
987
988 let start_anchor = if start_row == 0 {
989 Anchor::min()
990 } else {
991 snapshot
992 .buffer_snapshot
993 .anchor_before(DisplayPoint::new(start_row, 0).to_offset(&snapshot, Bias::Left))
994 };
995 let end_anchor = if end_row > snapshot.max_point().row() {
996 Anchor::max()
997 } else {
998 snapshot
999 .buffer_snapshot
1000 .anchor_before(DisplayPoint::new(end_row, 0).to_offset(&snapshot, Bias::Right))
1001 };
1002
1003 let mut selections: Vec<(ReplicaId, Vec<SelectionLayout>)> = Vec::new();
1004 let mut active_rows = BTreeMap::new();
1005 let mut highlighted_rows = None;
1006 let mut highlighted_ranges = Vec::new();
1007 self.update_view(cx.app, |view, cx| {
1008 let display_map = view.display_map.update(cx, |map, cx| map.snapshot(cx));
1009
1010 highlighted_rows = view.highlighted_rows();
1011 let theme = cx.global::<Settings>().theme.as_ref();
1012 highlighted_ranges = view.background_highlights_in_range(
1013 start_anchor.clone()..end_anchor.clone(),
1014 &display_map,
1015 theme,
1016 );
1017
1018 let mut remote_selections = HashMap::default();
1019 for (replica_id, line_mode, selection) in display_map
1020 .buffer_snapshot
1021 .remote_selections_in_range(&(start_anchor.clone()..end_anchor.clone()))
1022 {
1023 // The local selections match the leader's selections.
1024 if Some(replica_id) == view.leader_replica_id {
1025 continue;
1026 }
1027 remote_selections
1028 .entry(replica_id)
1029 .or_insert(Vec::new())
1030 .push(SelectionLayout::new(selection, line_mode, &display_map));
1031 }
1032 selections.extend(remote_selections);
1033
1034 if view.show_local_selections {
1035 let mut local_selections = view
1036 .selections
1037 .disjoint_in_range(start_anchor..end_anchor, cx);
1038 local_selections.extend(view.selections.pending(cx));
1039 for selection in &local_selections {
1040 let is_empty = selection.start == selection.end;
1041 let selection_start = snapshot.prev_line_boundary(selection.start).1;
1042 let selection_end = snapshot.next_line_boundary(selection.end).1;
1043 for row in cmp::max(selection_start.row(), start_row)
1044 ..=cmp::min(selection_end.row(), end_row)
1045 {
1046 let contains_non_empty_selection =
1047 active_rows.entry(row).or_insert(!is_empty);
1048 *contains_non_empty_selection |= !is_empty;
1049 }
1050 }
1051
1052 // Render the local selections in the leader's color when following.
1053 let local_replica_id = view.leader_replica_id.unwrap_or(view.replica_id(cx));
1054
1055 selections.push((
1056 local_replica_id,
1057 local_selections
1058 .into_iter()
1059 .map(|selection| {
1060 SelectionLayout::new(selection, view.selections.line_mode, &display_map)
1061 })
1062 .collect(),
1063 ));
1064 }
1065 });
1066
1067 let line_number_layouts =
1068 self.layout_line_numbers(start_row..end_row, &active_rows, &snapshot, cx);
1069
1070 let mut max_visible_line_width = 0.0;
1071 let line_layouts = self.layout_lines(start_row..end_row, &snapshot, cx);
1072 for line in &line_layouts {
1073 if line.width() > max_visible_line_width {
1074 max_visible_line_width = line.width();
1075 }
1076 }
1077
1078 let style = self.style.clone();
1079 let longest_line_width = layout_line(
1080 snapshot.longest_row(),
1081 &snapshot,
1082 &style,
1083 cx.text_layout_cache,
1084 )
1085 .width();
1086 let scroll_width = longest_line_width.max(max_visible_line_width) + overscroll.x();
1087 let em_width = style.text.em_width(cx.font_cache);
1088 let max_row = snapshot.max_point().row();
1089 let scroll_max = vec2f(
1090 ((scroll_width - text_size.x()) / em_width).max(0.0),
1091 max_row.saturating_sub(1) as f32,
1092 );
1093
1094 self.update_view(cx.app, |view, cx| {
1095 let clamped = view.clamp_scroll_left(scroll_max.x());
1096 let autoscrolled;
1097 if autoscroll_horizontally {
1098 autoscrolled = view.autoscroll_horizontally(
1099 start_row,
1100 text_size.x(),
1101 scroll_width,
1102 em_width,
1103 &line_layouts,
1104 cx,
1105 );
1106 } else {
1107 autoscrolled = false;
1108 }
1109
1110 if clamped || autoscrolled {
1111 snapshot = view.snapshot(cx);
1112 }
1113 });
1114
1115 let mut context_menu = None;
1116 let mut code_actions_indicator = None;
1117 let mut hover = None;
1118 cx.render(&self.view.upgrade(cx).unwrap(), |view, cx| {
1119 let newest_selection_head = view
1120 .selections
1121 .newest::<usize>(cx)
1122 .head()
1123 .to_display_point(&snapshot);
1124
1125 let style = view.style(cx);
1126 if (start_row..end_row).contains(&newest_selection_head.row()) {
1127 if view.context_menu_visible() {
1128 context_menu = view.render_context_menu(newest_selection_head, style.clone());
1129 }
1130
1131 code_actions_indicator = view
1132 .render_code_actions_indicator(&style, cx)
1133 .map(|indicator| (newest_selection_head.row(), indicator));
1134 }
1135
1136 if let Some(project) = view.project.clone() {
1137 let project = project.read(cx);
1138 hover = view.render_hover_popover(style, project);
1139 }
1140 });
1141
1142 if let Some((_, context_menu)) = context_menu.as_mut() {
1143 context_menu.layout(
1144 SizeConstraint {
1145 min: Vector2F::zero(),
1146 max: vec2f(
1147 f32::INFINITY,
1148 (12. * line_height).min((size.y() - line_height) / 2.),
1149 ),
1150 },
1151 cx,
1152 );
1153 }
1154
1155 if let Some((_, indicator)) = code_actions_indicator.as_mut() {
1156 indicator.layout(
1157 SizeConstraint::strict_along(Axis::Vertical, line_height * 0.618),
1158 cx,
1159 );
1160 }
1161
1162 if let Some((_, hover)) = hover.as_mut() {
1163 hover.layout(
1164 SizeConstraint {
1165 min: Vector2F::zero(),
1166 max: vec2f(
1167 (120. * em_width).min(size.x()),
1168 (size.y() - line_height) * 3. / 2.,
1169 ),
1170 },
1171 cx,
1172 );
1173 }
1174
1175 let blocks = self.layout_blocks(
1176 start_row..end_row,
1177 &snapshot,
1178 size.x().max(scroll_width + gutter_width),
1179 gutter_padding,
1180 gutter_width,
1181 em_width,
1182 gutter_width + gutter_margin,
1183 line_height,
1184 &style,
1185 &line_layouts,
1186 cx,
1187 );
1188
1189 (
1190 size,
1191 LayoutState {
1192 size,
1193 scroll_max,
1194 gutter_size,
1195 gutter_padding,
1196 text_size,
1197 gutter_margin,
1198 snapshot,
1199 active_rows,
1200 highlighted_rows,
1201 highlighted_ranges,
1202 line_layouts,
1203 line_number_layouts,
1204 blocks,
1205 line_height,
1206 em_width,
1207 em_advance,
1208 selections,
1209 context_menu,
1210 code_actions_indicator,
1211 hover,
1212 },
1213 )
1214 }
1215
1216 fn paint(
1217 &mut self,
1218 bounds: RectF,
1219 visible_bounds: RectF,
1220 layout: &mut Self::LayoutState,
1221 cx: &mut PaintContext,
1222 ) -> Self::PaintState {
1223 cx.scene.push_layer(Some(bounds));
1224
1225 let gutter_bounds = RectF::new(bounds.origin(), layout.gutter_size);
1226 let text_bounds = RectF::new(
1227 bounds.origin() + vec2f(layout.gutter_size.x(), 0.0),
1228 layout.text_size,
1229 );
1230
1231 self.paint_background(gutter_bounds, text_bounds, layout, cx);
1232 if layout.gutter_size.x() > 0. {
1233 self.paint_gutter(gutter_bounds, visible_bounds, layout, cx);
1234 }
1235 self.paint_text(text_bounds, visible_bounds, layout, cx);
1236
1237 if !layout.blocks.is_empty() {
1238 cx.scene.push_layer(Some(bounds));
1239 self.paint_blocks(bounds, visible_bounds, layout, cx);
1240 cx.scene.pop_layer();
1241 }
1242
1243 cx.scene.pop_layer();
1244
1245 PaintState {
1246 bounds,
1247 gutter_bounds,
1248 text_bounds,
1249 }
1250 }
1251
1252 fn dispatch_event(
1253 &mut self,
1254 event: &Event,
1255 _: RectF,
1256 _: RectF,
1257 layout: &mut LayoutState,
1258 paint: &mut PaintState,
1259 cx: &mut EventContext,
1260 ) -> bool {
1261 if let Some((_, context_menu)) = &mut layout.context_menu {
1262 if context_menu.dispatch_event(event, cx) {
1263 return true;
1264 }
1265 }
1266
1267 if let Some((_, indicator)) = &mut layout.code_actions_indicator {
1268 if indicator.dispatch_event(event, cx) {
1269 return true;
1270 }
1271 }
1272
1273 for (_, block) in &mut layout.blocks {
1274 if block.dispatch_event(event, cx) {
1275 return true;
1276 }
1277 }
1278
1279 match event {
1280 Event::LeftMouseDown {
1281 position,
1282 cmd,
1283 alt,
1284 shift,
1285 click_count,
1286 ..
1287 } => self.mouse_down(
1288 *position,
1289 *cmd,
1290 *alt,
1291 *shift,
1292 *click_count,
1293 layout,
1294 paint,
1295 cx,
1296 ),
1297 Event::LeftMouseUp { position, .. } => self.mouse_up(*position, cx),
1298 Event::LeftMouseDragged { position } => {
1299 self.mouse_dragged(*position, layout, paint, cx)
1300 }
1301 Event::ScrollWheel {
1302 position,
1303 delta,
1304 precise,
1305 } => self.scroll(*position, *delta, *precise, layout, paint, cx),
1306 Event::KeyDown { input, .. } => self.key_down(input.as_deref(), cx),
1307 Event::MouseMoved { position, .. } => {
1308 let point = if paint.text_bounds.contains_point(*position) {
1309 let (point, overshoot) =
1310 paint.point_for_position(&self.snapshot(cx), layout, *position);
1311 if overshoot.is_zero() {
1312 Some(point)
1313 } else {
1314 None
1315 }
1316 } else {
1317 None
1318 };
1319
1320 cx.dispatch_action(Hover { point });
1321 true
1322 }
1323 _ => false,
1324 }
1325 }
1326
1327 fn debug(
1328 &self,
1329 bounds: RectF,
1330 _: &Self::LayoutState,
1331 _: &Self::PaintState,
1332 _: &gpui::DebugContext,
1333 ) -> json::Value {
1334 json!({
1335 "type": "BufferElement",
1336 "bounds": bounds.to_json()
1337 })
1338 }
1339}
1340
1341pub struct LayoutState {
1342 size: Vector2F,
1343 scroll_max: Vector2F,
1344 gutter_size: Vector2F,
1345 gutter_padding: f32,
1346 gutter_margin: f32,
1347 text_size: Vector2F,
1348 snapshot: EditorSnapshot,
1349 active_rows: BTreeMap<u32, bool>,
1350 highlighted_rows: Option<Range<u32>>,
1351 line_layouts: Vec<text_layout::Line>,
1352 line_number_layouts: Vec<Option<text_layout::Line>>,
1353 blocks: Vec<(u32, ElementBox)>,
1354 line_height: f32,
1355 em_width: f32,
1356 em_advance: f32,
1357 highlighted_ranges: Vec<(Range<DisplayPoint>, Color)>,
1358 selections: Vec<(ReplicaId, Vec<SelectionLayout>)>,
1359 context_menu: Option<(DisplayPoint, ElementBox)>,
1360 code_actions_indicator: Option<(u32, ElementBox)>,
1361 hover: Option<(DisplayPoint, ElementBox)>,
1362}
1363
1364fn layout_line(
1365 row: u32,
1366 snapshot: &EditorSnapshot,
1367 style: &EditorStyle,
1368 layout_cache: &TextLayoutCache,
1369) -> text_layout::Line {
1370 let mut line = snapshot.line(row);
1371
1372 if line.len() > MAX_LINE_LEN {
1373 let mut len = MAX_LINE_LEN;
1374 while !line.is_char_boundary(len) {
1375 len -= 1;
1376 }
1377
1378 line.truncate(len);
1379 }
1380
1381 layout_cache.layout_str(
1382 &line,
1383 style.text.font_size,
1384 &[(
1385 snapshot.line_len(row) as usize,
1386 RunStyle {
1387 font_id: style.text.font_id,
1388 color: Color::black(),
1389 underline: Default::default(),
1390 },
1391 )],
1392 )
1393}
1394
1395pub struct PaintState {
1396 bounds: RectF,
1397 gutter_bounds: RectF,
1398 text_bounds: RectF,
1399}
1400
1401impl PaintState {
1402 /// Returns two display points. The first is the nearest valid
1403 /// position in the current buffer and the second is the distance to the
1404 /// nearest valid position if there was overshoot.
1405 fn point_for_position(
1406 &self,
1407 snapshot: &EditorSnapshot,
1408 layout: &LayoutState,
1409 position: Vector2F,
1410 ) -> (DisplayPoint, DisplayPoint) {
1411 let scroll_position = snapshot.scroll_position();
1412 let position = position - self.text_bounds.origin();
1413 let y = position.y().max(0.0).min(layout.size.y());
1414 let row = ((y / layout.line_height) + scroll_position.y()) as u32;
1415 let row_overshoot = row.saturating_sub(snapshot.max_point().row());
1416 let row = cmp::min(row, snapshot.max_point().row());
1417 let line = &layout.line_layouts[(row - scroll_position.y() as u32) as usize];
1418 let x = position.x() + (scroll_position.x() * layout.em_width);
1419
1420 let column = if x >= 0.0 {
1421 line.index_for_x(x)
1422 .map(|ix| ix as u32)
1423 .unwrap_or_else(|| snapshot.line_len(row))
1424 } else {
1425 0
1426 };
1427 let column_overshoot = (0f32.max(x - line.width()) / layout.em_advance) as u32;
1428
1429 (
1430 DisplayPoint::new(row, column),
1431 DisplayPoint::new(row_overshoot, column_overshoot),
1432 )
1433 }
1434}
1435
1436#[derive(Copy, Clone, PartialEq, Eq)]
1437pub enum CursorShape {
1438 Bar,
1439 Block,
1440 Underscore,
1441}
1442
1443impl Default for CursorShape {
1444 fn default() -> Self {
1445 CursorShape::Bar
1446 }
1447}
1448
1449struct Cursor {
1450 origin: Vector2F,
1451 block_width: f32,
1452 line_height: f32,
1453 color: Color,
1454 shape: CursorShape,
1455 block_text: Option<Line>,
1456}
1457
1458impl Cursor {
1459 fn paint(&self, cx: &mut PaintContext) {
1460 let bounds = match self.shape {
1461 CursorShape::Bar => RectF::new(self.origin, vec2f(2.0, self.line_height)),
1462 CursorShape::Block => {
1463 RectF::new(self.origin, vec2f(self.block_width, self.line_height))
1464 }
1465 CursorShape::Underscore => RectF::new(
1466 self.origin + Vector2F::new(0.0, self.line_height - 2.0),
1467 vec2f(self.block_width, 2.0),
1468 ),
1469 };
1470
1471 cx.scene.push_quad(Quad {
1472 bounds,
1473 background: Some(self.color),
1474 border: Border::new(0., Color::black()),
1475 corner_radius: 0.,
1476 });
1477
1478 if let Some(block_text) = &self.block_text {
1479 block_text.paint(self.origin, bounds, self.line_height, cx);
1480 }
1481 }
1482}
1483
1484#[derive(Debug)]
1485struct HighlightedRange {
1486 start_y: f32,
1487 line_height: f32,
1488 lines: Vec<HighlightedRangeLine>,
1489 color: Color,
1490 corner_radius: f32,
1491}
1492
1493#[derive(Debug)]
1494struct HighlightedRangeLine {
1495 start_x: f32,
1496 end_x: f32,
1497}
1498
1499impl HighlightedRange {
1500 fn paint(&self, bounds: RectF, scene: &mut Scene) {
1501 if self.lines.len() >= 2 && self.lines[0].start_x > self.lines[1].end_x {
1502 self.paint_lines(self.start_y, &self.lines[0..1], bounds, scene);
1503 self.paint_lines(
1504 self.start_y + self.line_height,
1505 &self.lines[1..],
1506 bounds,
1507 scene,
1508 );
1509 } else {
1510 self.paint_lines(self.start_y, &self.lines, bounds, scene);
1511 }
1512 }
1513
1514 fn paint_lines(
1515 &self,
1516 start_y: f32,
1517 lines: &[HighlightedRangeLine],
1518 bounds: RectF,
1519 scene: &mut Scene,
1520 ) {
1521 if lines.is_empty() {
1522 return;
1523 }
1524
1525 let mut path = PathBuilder::new();
1526 let first_line = lines.first().unwrap();
1527 let last_line = lines.last().unwrap();
1528
1529 let first_top_left = vec2f(first_line.start_x, start_y);
1530 let first_top_right = vec2f(first_line.end_x, start_y);
1531
1532 let curve_height = vec2f(0., self.corner_radius);
1533 let curve_width = |start_x: f32, end_x: f32| {
1534 let max = (end_x - start_x) / 2.;
1535 let width = if max < self.corner_radius {
1536 max
1537 } else {
1538 self.corner_radius
1539 };
1540
1541 vec2f(width, 0.)
1542 };
1543
1544 let top_curve_width = curve_width(first_line.start_x, first_line.end_x);
1545 path.reset(first_top_right - top_curve_width);
1546 path.curve_to(first_top_right + curve_height, first_top_right);
1547
1548 let mut iter = lines.iter().enumerate().peekable();
1549 while let Some((ix, line)) = iter.next() {
1550 let bottom_right = vec2f(line.end_x, start_y + (ix + 1) as f32 * self.line_height);
1551
1552 if let Some((_, next_line)) = iter.peek() {
1553 let next_top_right = vec2f(next_line.end_x, bottom_right.y());
1554
1555 match next_top_right.x().partial_cmp(&bottom_right.x()).unwrap() {
1556 Ordering::Equal => {
1557 path.line_to(bottom_right);
1558 }
1559 Ordering::Less => {
1560 let curve_width = curve_width(next_top_right.x(), bottom_right.x());
1561 path.line_to(bottom_right - curve_height);
1562 if self.corner_radius > 0. {
1563 path.curve_to(bottom_right - curve_width, bottom_right);
1564 }
1565 path.line_to(next_top_right + curve_width);
1566 if self.corner_radius > 0. {
1567 path.curve_to(next_top_right + curve_height, next_top_right);
1568 }
1569 }
1570 Ordering::Greater => {
1571 let curve_width = curve_width(bottom_right.x(), next_top_right.x());
1572 path.line_to(bottom_right - curve_height);
1573 if self.corner_radius > 0. {
1574 path.curve_to(bottom_right + curve_width, bottom_right);
1575 }
1576 path.line_to(next_top_right - curve_width);
1577 if self.corner_radius > 0. {
1578 path.curve_to(next_top_right + curve_height, next_top_right);
1579 }
1580 }
1581 }
1582 } else {
1583 let curve_width = curve_width(line.start_x, line.end_x);
1584 path.line_to(bottom_right - curve_height);
1585 if self.corner_radius > 0. {
1586 path.curve_to(bottom_right - curve_width, bottom_right);
1587 }
1588
1589 let bottom_left = vec2f(line.start_x, bottom_right.y());
1590 path.line_to(bottom_left + curve_width);
1591 if self.corner_radius > 0. {
1592 path.curve_to(bottom_left - curve_height, bottom_left);
1593 }
1594 }
1595 }
1596
1597 if first_line.start_x > last_line.start_x {
1598 let curve_width = curve_width(last_line.start_x, first_line.start_x);
1599 let second_top_left = vec2f(last_line.start_x, start_y + self.line_height);
1600 path.line_to(second_top_left + curve_height);
1601 if self.corner_radius > 0. {
1602 path.curve_to(second_top_left + curve_width, second_top_left);
1603 }
1604 let first_bottom_left = vec2f(first_line.start_x, second_top_left.y());
1605 path.line_to(first_bottom_left - curve_width);
1606 if self.corner_radius > 0. {
1607 path.curve_to(first_bottom_left - curve_height, first_bottom_left);
1608 }
1609 }
1610
1611 path.line_to(first_top_left + curve_height);
1612 if self.corner_radius > 0. {
1613 path.curve_to(first_top_left + top_curve_width, first_top_left);
1614 }
1615 path.line_to(first_top_right - top_curve_width);
1616
1617 scene.push_path(path.build(self.color, Some(bounds)));
1618 }
1619}
1620
1621fn scale_vertical_mouse_autoscroll_delta(delta: f32) -> f32 {
1622 delta.powf(1.5) / 100.0
1623}
1624
1625fn scale_horizontal_mouse_autoscroll_delta(delta: f32) -> f32 {
1626 delta.powf(1.2) / 300.0
1627}
1628
1629#[cfg(test)]
1630mod tests {
1631 use std::sync::Arc;
1632
1633 use super::*;
1634 use crate::{
1635 display_map::{BlockDisposition, BlockProperties},
1636 Editor, MultiBuffer,
1637 };
1638 use settings::Settings;
1639 use util::test::sample_text;
1640
1641 #[gpui::test]
1642 fn test_layout_line_numbers(cx: &mut gpui::MutableAppContext) {
1643 cx.set_global(Settings::test(cx));
1644 let buffer = MultiBuffer::build_simple(&sample_text(6, 6, 'a'), cx);
1645 let (window_id, editor) = cx.add_window(Default::default(), |cx| {
1646 Editor::new(EditorMode::Full, buffer, None, None, None, cx)
1647 });
1648 let element = EditorElement::new(
1649 editor.downgrade(),
1650 editor.read(cx).style(cx),
1651 CursorShape::Bar,
1652 );
1653
1654 let layouts = editor.update(cx, |editor, cx| {
1655 let snapshot = editor.snapshot(cx);
1656 let mut presenter = cx.build_presenter(window_id, 30.);
1657 let mut layout_cx = presenter.build_layout_context(Vector2F::zero(), false, cx);
1658 element.layout_line_numbers(0..6, &Default::default(), &snapshot, &mut layout_cx)
1659 });
1660 assert_eq!(layouts.len(), 6);
1661 }
1662
1663 #[gpui::test]
1664 fn test_layout_with_placeholder_text_and_blocks(cx: &mut gpui::MutableAppContext) {
1665 cx.set_global(Settings::test(cx));
1666 let buffer = MultiBuffer::build_simple("", cx);
1667 let (window_id, editor) = cx.add_window(Default::default(), |cx| {
1668 Editor::new(EditorMode::Full, buffer, None, None, None, cx)
1669 });
1670
1671 editor.update(cx, |editor, cx| {
1672 editor.set_placeholder_text("hello", cx);
1673 editor.insert_blocks(
1674 [BlockProperties {
1675 disposition: BlockDisposition::Above,
1676 height: 3,
1677 position: Anchor::min(),
1678 render: Arc::new(|_| Empty::new().boxed()),
1679 }],
1680 cx,
1681 );
1682
1683 // Blur the editor so that it displays placeholder text.
1684 cx.blur();
1685 });
1686
1687 let mut element = EditorElement::new(
1688 editor.downgrade(),
1689 editor.read(cx).style(cx),
1690 CursorShape::Bar,
1691 );
1692
1693 let mut scene = Scene::new(1.0);
1694 let mut presenter = cx.build_presenter(window_id, 30.);
1695 let mut layout_cx = presenter.build_layout_context(Vector2F::zero(), false, cx);
1696 let (size, mut state) = element.layout(
1697 SizeConstraint::new(vec2f(500., 500.), vec2f(500., 500.)),
1698 &mut layout_cx,
1699 );
1700
1701 assert_eq!(state.line_layouts.len(), 4);
1702 assert_eq!(
1703 state
1704 .line_number_layouts
1705 .iter()
1706 .map(Option::is_some)
1707 .collect::<Vec<_>>(),
1708 &[false, false, false, true]
1709 );
1710
1711 // Don't panic.
1712 let bounds = RectF::new(Default::default(), size);
1713 let mut paint_cx = presenter.build_paint_context(&mut scene, bounds.size(), cx);
1714 element.paint(bounds, bounds, &mut state, &mut paint_cx);
1715 }
1716}