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, HoverAt,
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 cx.scene.push_stacking_context(None);
513
514 // This is safe because we check on layout whether the required row is available
515 let hovered_row_layout = &layout.line_layouts[(position.row() - start_row) as usize];
516 let size = hover_popover.size();
517 let x = hovered_row_layout.x_for_index(position.column() as usize) - scroll_left;
518 let y = position.row() as f32 * layout.line_height - scroll_top - size.y();
519 let mut popover_origin = content_origin + vec2f(x, y);
520
521 if popover_origin.y() < 0.0 {
522 popover_origin.set_y(popover_origin.y() + layout.line_height + size.y());
523 }
524
525 let x_out_of_bounds = bounds.max_x() - (popover_origin.x() + size.x());
526 if x_out_of_bounds < 0.0 {
527 popover_origin.set_x(popover_origin.x() + x_out_of_bounds);
528 }
529
530 hover_popover.paint(
531 popover_origin,
532 RectF::from_points(Vector2F::zero(), vec2f(f32::MAX, f32::MAX)), // Let content bleed outside of editor
533 cx,
534 );
535
536 cx.scene.pop_stacking_context();
537 }
538
539 cx.scene.pop_layer();
540 }
541
542 fn paint_highlighted_range(
543 &self,
544 range: Range<DisplayPoint>,
545 start_row: u32,
546 end_row: u32,
547 color: Color,
548 corner_radius: f32,
549 line_end_overshoot: f32,
550 layout: &LayoutState,
551 content_origin: Vector2F,
552 scroll_top: f32,
553 scroll_left: f32,
554 bounds: RectF,
555 cx: &mut PaintContext,
556 ) {
557 if range.start != range.end {
558 let row_range = if range.end.column() == 0 {
559 cmp::max(range.start.row(), start_row)..cmp::min(range.end.row(), end_row)
560 } else {
561 cmp::max(range.start.row(), start_row)..cmp::min(range.end.row() + 1, end_row)
562 };
563
564 let highlighted_range = HighlightedRange {
565 color,
566 line_height: layout.line_height,
567 corner_radius,
568 start_y: content_origin.y() + row_range.start as f32 * layout.line_height
569 - scroll_top,
570 lines: row_range
571 .into_iter()
572 .map(|row| {
573 let line_layout = &layout.line_layouts[(row - start_row) as usize];
574 HighlightedRangeLine {
575 start_x: if row == range.start.row() {
576 content_origin.x()
577 + line_layout.x_for_index(range.start.column() as usize)
578 - scroll_left
579 } else {
580 content_origin.x() - scroll_left
581 },
582 end_x: if row == range.end.row() {
583 content_origin.x()
584 + line_layout.x_for_index(range.end.column() as usize)
585 - scroll_left
586 } else {
587 content_origin.x() + line_layout.width() + line_end_overshoot
588 - scroll_left
589 },
590 }
591 })
592 .collect(),
593 };
594
595 highlighted_range.paint(bounds, cx.scene);
596 }
597 }
598
599 fn paint_blocks(
600 &mut self,
601 bounds: RectF,
602 visible_bounds: RectF,
603 layout: &mut LayoutState,
604 cx: &mut PaintContext,
605 ) {
606 let scroll_position = layout.snapshot.scroll_position();
607 let scroll_left = scroll_position.x() * layout.em_width;
608 let scroll_top = scroll_position.y() * layout.line_height;
609
610 for (row, element) in &mut layout.blocks {
611 let origin = bounds.origin()
612 + vec2f(-scroll_left, *row as f32 * layout.line_height - scroll_top);
613 element.paint(origin, visible_bounds, cx);
614 }
615 }
616
617 fn max_line_number_width(&self, snapshot: &EditorSnapshot, cx: &LayoutContext) -> f32 {
618 let digit_count = (snapshot.max_buffer_row() as f32).log10().floor() as usize + 1;
619 let style = &self.style;
620
621 cx.text_layout_cache
622 .layout_str(
623 "1".repeat(digit_count).as_str(),
624 style.text.font_size,
625 &[(
626 digit_count,
627 RunStyle {
628 font_id: style.text.font_id,
629 color: Color::black(),
630 underline: Default::default(),
631 },
632 )],
633 )
634 .width()
635 }
636
637 fn layout_line_numbers(
638 &self,
639 rows: Range<u32>,
640 active_rows: &BTreeMap<u32, bool>,
641 snapshot: &EditorSnapshot,
642 cx: &LayoutContext,
643 ) -> Vec<Option<text_layout::Line>> {
644 let style = &self.style;
645 let include_line_numbers = snapshot.mode == EditorMode::Full;
646 let mut line_number_layouts = Vec::with_capacity(rows.len());
647 let mut line_number = String::new();
648 for (ix, row) in snapshot
649 .buffer_rows(rows.start)
650 .take((rows.end - rows.start) as usize)
651 .enumerate()
652 {
653 let display_row = rows.start + ix as u32;
654 let color = if active_rows.contains_key(&display_row) {
655 style.line_number_active
656 } else {
657 style.line_number
658 };
659 if let Some(buffer_row) = row {
660 if include_line_numbers {
661 line_number.clear();
662 write!(&mut line_number, "{}", buffer_row + 1).unwrap();
663 line_number_layouts.push(Some(cx.text_layout_cache.layout_str(
664 &line_number,
665 style.text.font_size,
666 &[(
667 line_number.len(),
668 RunStyle {
669 font_id: style.text.font_id,
670 color,
671 underline: Default::default(),
672 },
673 )],
674 )));
675 }
676 } else {
677 line_number_layouts.push(None);
678 }
679 }
680
681 line_number_layouts
682 }
683
684 fn layout_lines(
685 &mut self,
686 rows: Range<u32>,
687 snapshot: &EditorSnapshot,
688 cx: &LayoutContext,
689 ) -> Vec<text_layout::Line> {
690 if rows.start >= rows.end {
691 return Vec::new();
692 }
693
694 // When the editor is empty and unfocused, then show the placeholder.
695 if snapshot.is_empty() && !snapshot.is_focused() {
696 let placeholder_style = self
697 .style
698 .placeholder_text
699 .as_ref()
700 .unwrap_or_else(|| &self.style.text);
701 let placeholder_text = snapshot.placeholder_text();
702 let placeholder_lines = placeholder_text
703 .as_ref()
704 .map_or("", AsRef::as_ref)
705 .split('\n')
706 .skip(rows.start as usize)
707 .chain(iter::repeat(""))
708 .take(rows.len());
709 return placeholder_lines
710 .map(|line| {
711 cx.text_layout_cache.layout_str(
712 line,
713 placeholder_style.font_size,
714 &[(
715 line.len(),
716 RunStyle {
717 font_id: placeholder_style.font_id,
718 color: placeholder_style.color,
719 underline: Default::default(),
720 },
721 )],
722 )
723 })
724 .collect();
725 } else {
726 let style = &self.style;
727 let chunks = snapshot.chunks(rows.clone(), true).map(|chunk| {
728 let mut highlight_style = chunk
729 .syntax_highlight_id
730 .and_then(|id| id.style(&style.syntax));
731
732 if let Some(chunk_highlight) = chunk.highlight_style {
733 if let Some(highlight_style) = highlight_style.as_mut() {
734 highlight_style.highlight(chunk_highlight);
735 } else {
736 highlight_style = Some(chunk_highlight);
737 }
738 }
739
740 let mut diagnostic_highlight = HighlightStyle::default();
741
742 if chunk.is_unnecessary {
743 diagnostic_highlight.fade_out = Some(style.unnecessary_code_fade);
744 }
745
746 if let Some(severity) = chunk.diagnostic_severity {
747 // Omit underlines for HINT/INFO diagnostics on 'unnecessary' code.
748 if severity <= DiagnosticSeverity::WARNING || !chunk.is_unnecessary {
749 let diagnostic_style = super::diagnostic_style(severity, true, style);
750 diagnostic_highlight.underline = Some(Underline {
751 color: Some(diagnostic_style.message.text.color),
752 thickness: 1.0.into(),
753 squiggly: true,
754 });
755 }
756 }
757
758 if let Some(highlight_style) = highlight_style.as_mut() {
759 highlight_style.highlight(diagnostic_highlight);
760 } else {
761 highlight_style = Some(diagnostic_highlight);
762 }
763
764 (chunk.text, highlight_style)
765 });
766 layout_highlighted_chunks(
767 chunks,
768 &style.text,
769 &cx.text_layout_cache,
770 &cx.font_cache,
771 MAX_LINE_LEN,
772 rows.len() as usize,
773 )
774 }
775 }
776
777 fn layout_blocks(
778 &mut self,
779 rows: Range<u32>,
780 snapshot: &EditorSnapshot,
781 width: f32,
782 gutter_padding: f32,
783 gutter_width: f32,
784 em_width: f32,
785 text_x: f32,
786 line_height: f32,
787 style: &EditorStyle,
788 line_layouts: &[text_layout::Line],
789 cx: &mut LayoutContext,
790 ) -> Vec<(u32, ElementBox)> {
791 let editor = if let Some(editor) = self.view.upgrade(cx) {
792 editor
793 } else {
794 return Default::default();
795 };
796
797 let scroll_x = snapshot.scroll_position.x();
798 snapshot
799 .blocks_in_range(rows.clone())
800 .map(|(block_row, block)| {
801 let mut element = match block {
802 TransformBlock::Custom(block) => {
803 let align_to = block
804 .position()
805 .to_point(&snapshot.buffer_snapshot)
806 .to_display_point(snapshot);
807 let anchor_x = text_x
808 + if rows.contains(&align_to.row()) {
809 line_layouts[(align_to.row() - rows.start) as usize]
810 .x_for_index(align_to.column() as usize)
811 } else {
812 layout_line(align_to.row(), snapshot, style, cx.text_layout_cache)
813 .x_for_index(align_to.column() as usize)
814 };
815
816 cx.render(&editor, |_, cx| {
817 block.render(&mut BlockContext {
818 cx,
819 anchor_x,
820 gutter_padding,
821 line_height,
822 scroll_x,
823 gutter_width,
824 em_width,
825 })
826 })
827 }
828 TransformBlock::ExcerptHeader {
829 buffer,
830 starts_new_buffer,
831 ..
832 } => {
833 if *starts_new_buffer {
834 let style = &self.style.diagnostic_path_header;
835 let font_size =
836 (style.text_scale_factor * self.style.text.font_size).round();
837
838 let mut filename = None;
839 let mut parent_path = None;
840 if let Some(path) = buffer.path() {
841 filename =
842 path.file_name().map(|f| f.to_string_lossy().to_string());
843 parent_path =
844 path.parent().map(|p| p.to_string_lossy().to_string() + "/");
845 }
846
847 Flex::row()
848 .with_child(
849 Label::new(
850 filename.unwrap_or_else(|| "untitled".to_string()),
851 style.filename.text.clone().with_font_size(font_size),
852 )
853 .contained()
854 .with_style(style.filename.container)
855 .boxed(),
856 )
857 .with_children(parent_path.map(|path| {
858 Label::new(
859 path,
860 style.path.text.clone().with_font_size(font_size),
861 )
862 .contained()
863 .with_style(style.path.container)
864 .boxed()
865 }))
866 .aligned()
867 .left()
868 .contained()
869 .with_style(style.container)
870 .with_padding_left(gutter_padding + scroll_x * em_width)
871 .expanded()
872 .named("path header block")
873 } else {
874 let text_style = self.style.text.clone();
875 Label::new("…".to_string(), text_style)
876 .contained()
877 .with_padding_left(gutter_padding + scroll_x * em_width)
878 .named("collapsed context")
879 }
880 }
881 };
882
883 element.layout(
884 SizeConstraint {
885 min: Vector2F::zero(),
886 max: vec2f(width, block.height() as f32 * line_height),
887 },
888 cx,
889 );
890 (block_row, element)
891 })
892 .collect()
893 }
894}
895
896impl Element for EditorElement {
897 type LayoutState = LayoutState;
898 type PaintState = PaintState;
899
900 fn layout(
901 &mut self,
902 constraint: SizeConstraint,
903 cx: &mut LayoutContext,
904 ) -> (Vector2F, Self::LayoutState) {
905 let mut size = constraint.max;
906 if size.x().is_infinite() {
907 unimplemented!("we don't yet handle an infinite width constraint on buffer elements");
908 }
909
910 let snapshot = self.snapshot(cx.app);
911 let style = self.style.clone();
912 let line_height = style.text.line_height(cx.font_cache);
913
914 let gutter_padding;
915 let gutter_width;
916 let gutter_margin;
917 if snapshot.mode == EditorMode::Full {
918 gutter_padding = style.text.em_width(cx.font_cache) * style.gutter_padding_factor;
919 gutter_width = self.max_line_number_width(&snapshot, cx) + gutter_padding * 2.0;
920 gutter_margin = -style.text.descent(cx.font_cache);
921 } else {
922 gutter_padding = 0.0;
923 gutter_width = 0.0;
924 gutter_margin = 0.0;
925 };
926
927 let text_width = size.x() - gutter_width;
928 let em_width = style.text.em_width(cx.font_cache);
929 let em_advance = style.text.em_advance(cx.font_cache);
930 let overscroll = vec2f(em_width, 0.);
931 let snapshot = self.update_view(cx.app, |view, cx| {
932 let wrap_width = match view.soft_wrap_mode(cx) {
933 SoftWrap::None => Some((MAX_LINE_LEN / 2) as f32 * em_advance),
934 SoftWrap::EditorWidth => {
935 Some(text_width - gutter_margin - overscroll.x() - em_width)
936 }
937 SoftWrap::Column(column) => Some(column as f32 * em_advance),
938 };
939
940 if view.set_wrap_width(wrap_width, cx) {
941 view.snapshot(cx)
942 } else {
943 snapshot
944 }
945 });
946
947 let scroll_height = (snapshot.max_point().row() + 1) as f32 * line_height;
948 if let EditorMode::AutoHeight { max_lines } = snapshot.mode {
949 size.set_y(
950 scroll_height
951 .min(constraint.max_along(Axis::Vertical))
952 .max(constraint.min_along(Axis::Vertical))
953 .min(line_height * max_lines as f32),
954 )
955 } else if let EditorMode::SingleLine = snapshot.mode {
956 size.set_y(
957 line_height
958 .min(constraint.max_along(Axis::Vertical))
959 .max(constraint.min_along(Axis::Vertical)),
960 )
961 } else if size.y().is_infinite() {
962 size.set_y(scroll_height);
963 }
964 let gutter_size = vec2f(gutter_width, size.y());
965 let text_size = vec2f(text_width, size.y());
966
967 let (autoscroll_horizontally, mut snapshot) = self.update_view(cx.app, |view, cx| {
968 let autoscroll_horizontally = view.autoscroll_vertically(size.y(), line_height, cx);
969 let snapshot = view.snapshot(cx);
970 (autoscroll_horizontally, snapshot)
971 });
972
973 let scroll_position = snapshot.scroll_position();
974 let start_row = scroll_position.y() as u32;
975 let scroll_top = scroll_position.y() * line_height;
976
977 // Add 1 to ensure selections bleed off screen
978 let end_row = 1 + cmp::min(
979 ((scroll_top + size.y()) / line_height).ceil() as u32,
980 snapshot.max_point().row(),
981 );
982
983 let start_anchor = if start_row == 0 {
984 Anchor::min()
985 } else {
986 snapshot
987 .buffer_snapshot
988 .anchor_before(DisplayPoint::new(start_row, 0).to_offset(&snapshot, Bias::Left))
989 };
990 let end_anchor = if end_row > snapshot.max_point().row() {
991 Anchor::max()
992 } else {
993 snapshot
994 .buffer_snapshot
995 .anchor_before(DisplayPoint::new(end_row, 0).to_offset(&snapshot, Bias::Right))
996 };
997
998 let mut selections: Vec<(ReplicaId, Vec<SelectionLayout>)> = Vec::new();
999 let mut active_rows = BTreeMap::new();
1000 let mut highlighted_rows = None;
1001 let mut highlighted_ranges = Vec::new();
1002 self.update_view(cx.app, |view, cx| {
1003 let display_map = view.display_map.update(cx, |map, cx| map.snapshot(cx));
1004
1005 highlighted_rows = view.highlighted_rows();
1006 let theme = cx.global::<Settings>().theme.as_ref();
1007 highlighted_ranges = view.background_highlights_in_range(
1008 start_anchor.clone()..end_anchor.clone(),
1009 &display_map,
1010 theme,
1011 );
1012
1013 let mut remote_selections = HashMap::default();
1014 for (replica_id, line_mode, selection) in display_map
1015 .buffer_snapshot
1016 .remote_selections_in_range(&(start_anchor.clone()..end_anchor.clone()))
1017 {
1018 // The local selections match the leader's selections.
1019 if Some(replica_id) == view.leader_replica_id {
1020 continue;
1021 }
1022 remote_selections
1023 .entry(replica_id)
1024 .or_insert(Vec::new())
1025 .push(SelectionLayout::new(selection, line_mode, &display_map));
1026 }
1027 selections.extend(remote_selections);
1028
1029 if view.show_local_selections {
1030 let mut local_selections = view
1031 .selections
1032 .disjoint_in_range(start_anchor..end_anchor, cx);
1033 local_selections.extend(view.selections.pending(cx));
1034 for selection in &local_selections {
1035 let is_empty = selection.start == selection.end;
1036 let selection_start = snapshot.prev_line_boundary(selection.start).1;
1037 let selection_end = snapshot.next_line_boundary(selection.end).1;
1038 for row in cmp::max(selection_start.row(), start_row)
1039 ..=cmp::min(selection_end.row(), end_row)
1040 {
1041 let contains_non_empty_selection =
1042 active_rows.entry(row).or_insert(!is_empty);
1043 *contains_non_empty_selection |= !is_empty;
1044 }
1045 }
1046
1047 // Render the local selections in the leader's color when following.
1048 let local_replica_id = view.leader_replica_id.unwrap_or(view.replica_id(cx));
1049
1050 selections.push((
1051 local_replica_id,
1052 local_selections
1053 .into_iter()
1054 .map(|selection| {
1055 SelectionLayout::new(selection, view.selections.line_mode, &display_map)
1056 })
1057 .collect(),
1058 ));
1059 }
1060 });
1061
1062 let line_number_layouts =
1063 self.layout_line_numbers(start_row..end_row, &active_rows, &snapshot, cx);
1064
1065 let mut max_visible_line_width = 0.0;
1066 let line_layouts = self.layout_lines(start_row..end_row, &snapshot, cx);
1067 for line in &line_layouts {
1068 if line.width() > max_visible_line_width {
1069 max_visible_line_width = line.width();
1070 }
1071 }
1072
1073 let style = self.style.clone();
1074 let longest_line_width = layout_line(
1075 snapshot.longest_row(),
1076 &snapshot,
1077 &style,
1078 cx.text_layout_cache,
1079 )
1080 .width();
1081 let scroll_width = longest_line_width.max(max_visible_line_width) + overscroll.x();
1082 let em_width = style.text.em_width(cx.font_cache);
1083 let max_row = snapshot.max_point().row();
1084 let scroll_max = vec2f(
1085 ((scroll_width - text_size.x()) / em_width).max(0.0),
1086 max_row.saturating_sub(1) as f32,
1087 );
1088
1089 self.update_view(cx.app, |view, cx| {
1090 let clamped = view.clamp_scroll_left(scroll_max.x());
1091 let autoscrolled;
1092 if autoscroll_horizontally {
1093 autoscrolled = view.autoscroll_horizontally(
1094 start_row,
1095 text_size.x(),
1096 scroll_width,
1097 em_width,
1098 &line_layouts,
1099 cx,
1100 );
1101 } else {
1102 autoscrolled = false;
1103 }
1104
1105 if clamped || autoscrolled {
1106 snapshot = view.snapshot(cx);
1107 }
1108 });
1109
1110 let mut context_menu = None;
1111 let mut code_actions_indicator = None;
1112 cx.render(&self.view.upgrade(cx).unwrap(), |view, cx| {
1113 let newest_selection_head = view
1114 .selections
1115 .newest::<usize>(cx)
1116 .head()
1117 .to_display_point(&snapshot);
1118
1119 let style = view.style(cx);
1120 if (start_row..end_row).contains(&newest_selection_head.row()) {
1121 if view.context_menu_visible() {
1122 context_menu =
1123 view.render_context_menu(newest_selection_head, style.clone(), cx);
1124 }
1125
1126 code_actions_indicator = view
1127 .render_code_actions_indicator(&style, cx)
1128 .map(|indicator| (newest_selection_head.row(), indicator));
1129 }
1130 });
1131
1132 if let Some((_, context_menu)) = context_menu.as_mut() {
1133 context_menu.layout(
1134 SizeConstraint {
1135 min: Vector2F::zero(),
1136 max: vec2f(
1137 f32::INFINITY,
1138 (12. * line_height).min((size.y() - line_height) / 2.),
1139 ),
1140 },
1141 cx,
1142 );
1143 }
1144
1145 if let Some((_, indicator)) = code_actions_indicator.as_mut() {
1146 indicator.layout(
1147 SizeConstraint::strict_along(Axis::Vertical, line_height * 0.618),
1148 cx,
1149 );
1150 }
1151
1152 let hover = self.view(cx).hover_popover().and_then(|hover| {
1153 let (point, mut rendered) = hover.render(style.clone(), cx);
1154
1155 if point.row() >= snapshot.scroll_position().y() as u32 {
1156 if line_layouts.len() > (point.row() - start_row) as usize {
1157 rendered.layout(
1158 SizeConstraint {
1159 min: Vector2F::zero(),
1160 max: vec2f(
1161 (120. * em_width).min(size.x()),
1162 (size.y() - line_height) * 1. / 2.,
1163 ),
1164 },
1165 cx,
1166 );
1167 return Some((point, rendered));
1168 }
1169 }
1170
1171 None
1172 });
1173
1174 let blocks = self.layout_blocks(
1175 start_row..end_row,
1176 &snapshot,
1177 size.x().max(scroll_width + gutter_width),
1178 gutter_padding,
1179 gutter_width,
1180 em_width,
1181 gutter_width + gutter_margin,
1182 line_height,
1183 &style,
1184 &line_layouts,
1185 cx,
1186 );
1187
1188 (
1189 size,
1190 LayoutState {
1191 size,
1192 scroll_max,
1193 gutter_size,
1194 gutter_padding,
1195 text_size,
1196 gutter_margin,
1197 snapshot,
1198 active_rows,
1199 highlighted_rows,
1200 highlighted_ranges,
1201 line_layouts,
1202 line_number_layouts,
1203 blocks,
1204 line_height,
1205 em_width,
1206 em_advance,
1207 selections,
1208 context_menu,
1209 code_actions_indicator,
1210 hover,
1211 },
1212 )
1213 }
1214
1215 fn paint(
1216 &mut self,
1217 bounds: RectF,
1218 visible_bounds: RectF,
1219 layout: &mut Self::LayoutState,
1220 cx: &mut PaintContext,
1221 ) -> Self::PaintState {
1222 cx.scene.push_layer(Some(bounds));
1223
1224 let gutter_bounds = RectF::new(bounds.origin(), layout.gutter_size);
1225 let text_bounds = RectF::new(
1226 bounds.origin() + vec2f(layout.gutter_size.x(), 0.0),
1227 layout.text_size,
1228 );
1229
1230 self.paint_background(gutter_bounds, text_bounds, layout, cx);
1231 if layout.gutter_size.x() > 0. {
1232 self.paint_gutter(gutter_bounds, visible_bounds, layout, cx);
1233 }
1234 self.paint_text(text_bounds, visible_bounds, layout, cx);
1235
1236 if !layout.blocks.is_empty() {
1237 cx.scene.push_layer(Some(bounds));
1238 self.paint_blocks(bounds, visible_bounds, layout, cx);
1239 cx.scene.pop_layer();
1240 }
1241
1242 cx.scene.pop_layer();
1243
1244 PaintState {
1245 bounds,
1246 gutter_bounds,
1247 text_bounds,
1248 }
1249 }
1250
1251 fn dispatch_event(
1252 &mut self,
1253 event: &Event,
1254 _: RectF,
1255 _: RectF,
1256 layout: &mut LayoutState,
1257 paint: &mut PaintState,
1258 cx: &mut EventContext,
1259 ) -> bool {
1260 if let Some((_, context_menu)) = &mut layout.context_menu {
1261 if context_menu.dispatch_event(event, cx) {
1262 return true;
1263 }
1264 }
1265
1266 if let Some((_, indicator)) = &mut layout.code_actions_indicator {
1267 if indicator.dispatch_event(event, cx) {
1268 return true;
1269 }
1270 }
1271
1272 if let Some((_, hover)) = &mut layout.hover {
1273 if hover.dispatch_event(event, cx) {
1274 return true;
1275 }
1276 }
1277
1278 for (_, block) in &mut layout.blocks {
1279 if block.dispatch_event(event, cx) {
1280 return true;
1281 }
1282 }
1283
1284 match event {
1285 Event::LeftMouseDown {
1286 position,
1287 cmd,
1288 alt,
1289 shift,
1290 click_count,
1291 ..
1292 } => self.mouse_down(
1293 *position,
1294 *cmd,
1295 *alt,
1296 *shift,
1297 *click_count,
1298 layout,
1299 paint,
1300 cx,
1301 ),
1302 Event::LeftMouseUp { position, .. } => self.mouse_up(*position, cx),
1303 Event::LeftMouseDragged { position } => {
1304 self.mouse_dragged(*position, layout, paint, cx)
1305 }
1306 Event::ScrollWheel {
1307 position,
1308 delta,
1309 precise,
1310 } => self.scroll(*position, *delta, *precise, layout, paint, cx),
1311 Event::KeyDown { input, .. } => self.key_down(input.as_deref(), cx),
1312 Event::MouseMoved { position, .. } => {
1313 let point = if paint.text_bounds.contains_point(*position) {
1314 let (point, overshoot) =
1315 paint.point_for_position(&self.snapshot(cx), layout, *position);
1316 if overshoot.is_zero() {
1317 Some(point)
1318 } else {
1319 None
1320 }
1321 } else {
1322 None
1323 };
1324
1325 cx.dispatch_action(HoverAt { point });
1326 true
1327 }
1328 _ => false,
1329 }
1330 }
1331
1332 fn debug(
1333 &self,
1334 bounds: RectF,
1335 _: &Self::LayoutState,
1336 _: &Self::PaintState,
1337 _: &gpui::DebugContext,
1338 ) -> json::Value {
1339 json!({
1340 "type": "BufferElement",
1341 "bounds": bounds.to_json()
1342 })
1343 }
1344}
1345
1346pub struct LayoutState {
1347 size: Vector2F,
1348 scroll_max: Vector2F,
1349 gutter_size: Vector2F,
1350 gutter_padding: f32,
1351 gutter_margin: f32,
1352 text_size: Vector2F,
1353 snapshot: EditorSnapshot,
1354 active_rows: BTreeMap<u32, bool>,
1355 highlighted_rows: Option<Range<u32>>,
1356 line_layouts: Vec<text_layout::Line>,
1357 line_number_layouts: Vec<Option<text_layout::Line>>,
1358 blocks: Vec<(u32, ElementBox)>,
1359 line_height: f32,
1360 em_width: f32,
1361 em_advance: f32,
1362 highlighted_ranges: Vec<(Range<DisplayPoint>, Color)>,
1363 selections: Vec<(ReplicaId, Vec<SelectionLayout>)>,
1364 context_menu: Option<(DisplayPoint, ElementBox)>,
1365 code_actions_indicator: Option<(u32, ElementBox)>,
1366 hover: Option<(DisplayPoint, ElementBox)>,
1367}
1368
1369fn layout_line(
1370 row: u32,
1371 snapshot: &EditorSnapshot,
1372 style: &EditorStyle,
1373 layout_cache: &TextLayoutCache,
1374) -> text_layout::Line {
1375 let mut line = snapshot.line(row);
1376
1377 if line.len() > MAX_LINE_LEN {
1378 let mut len = MAX_LINE_LEN;
1379 while !line.is_char_boundary(len) {
1380 len -= 1;
1381 }
1382
1383 line.truncate(len);
1384 }
1385
1386 layout_cache.layout_str(
1387 &line,
1388 style.text.font_size,
1389 &[(
1390 snapshot.line_len(row) as usize,
1391 RunStyle {
1392 font_id: style.text.font_id,
1393 color: Color::black(),
1394 underline: Default::default(),
1395 },
1396 )],
1397 )
1398}
1399
1400pub struct PaintState {
1401 bounds: RectF,
1402 gutter_bounds: RectF,
1403 text_bounds: RectF,
1404}
1405
1406impl PaintState {
1407 /// Returns two display points. The first is the nearest valid
1408 /// position in the current buffer and the second is the distance to the
1409 /// nearest valid position if there was overshoot.
1410 fn point_for_position(
1411 &self,
1412 snapshot: &EditorSnapshot,
1413 layout: &LayoutState,
1414 position: Vector2F,
1415 ) -> (DisplayPoint, DisplayPoint) {
1416 let scroll_position = snapshot.scroll_position();
1417 let position = position - self.text_bounds.origin();
1418 let y = position.y().max(0.0).min(layout.size.y());
1419 let row = ((y / layout.line_height) + scroll_position.y()) as u32;
1420 let row_overshoot = row.saturating_sub(snapshot.max_point().row());
1421 let row = cmp::min(row, snapshot.max_point().row());
1422 let line = &layout.line_layouts[(row - scroll_position.y() as u32) as usize];
1423 let x = position.x() + (scroll_position.x() * layout.em_width);
1424
1425 let column = if x >= 0.0 {
1426 line.index_for_x(x)
1427 .map(|ix| ix as u32)
1428 .unwrap_or_else(|| snapshot.line_len(row))
1429 } else {
1430 0
1431 };
1432 let column_overshoot = (0f32.max(x - line.width()) / layout.em_advance) as u32;
1433
1434 (
1435 DisplayPoint::new(row, column),
1436 DisplayPoint::new(row_overshoot, column_overshoot),
1437 )
1438 }
1439}
1440
1441#[derive(Copy, Clone, PartialEq, Eq)]
1442pub enum CursorShape {
1443 Bar,
1444 Block,
1445 Underscore,
1446}
1447
1448impl Default for CursorShape {
1449 fn default() -> Self {
1450 CursorShape::Bar
1451 }
1452}
1453
1454struct Cursor {
1455 origin: Vector2F,
1456 block_width: f32,
1457 line_height: f32,
1458 color: Color,
1459 shape: CursorShape,
1460 block_text: Option<Line>,
1461}
1462
1463impl Cursor {
1464 fn paint(&self, cx: &mut PaintContext) {
1465 let bounds = match self.shape {
1466 CursorShape::Bar => RectF::new(self.origin, vec2f(2.0, self.line_height)),
1467 CursorShape::Block => {
1468 RectF::new(self.origin, vec2f(self.block_width, self.line_height))
1469 }
1470 CursorShape::Underscore => RectF::new(
1471 self.origin + Vector2F::new(0.0, self.line_height - 2.0),
1472 vec2f(self.block_width, 2.0),
1473 ),
1474 };
1475
1476 cx.scene.push_quad(Quad {
1477 bounds,
1478 background: Some(self.color),
1479 border: Border::new(0., Color::black()),
1480 corner_radius: 0.,
1481 });
1482
1483 if let Some(block_text) = &self.block_text {
1484 block_text.paint(self.origin, bounds, self.line_height, cx);
1485 }
1486 }
1487}
1488
1489#[derive(Debug)]
1490struct HighlightedRange {
1491 start_y: f32,
1492 line_height: f32,
1493 lines: Vec<HighlightedRangeLine>,
1494 color: Color,
1495 corner_radius: f32,
1496}
1497
1498#[derive(Debug)]
1499struct HighlightedRangeLine {
1500 start_x: f32,
1501 end_x: f32,
1502}
1503
1504impl HighlightedRange {
1505 fn paint(&self, bounds: RectF, scene: &mut Scene) {
1506 if self.lines.len() >= 2 && self.lines[0].start_x > self.lines[1].end_x {
1507 self.paint_lines(self.start_y, &self.lines[0..1], bounds, scene);
1508 self.paint_lines(
1509 self.start_y + self.line_height,
1510 &self.lines[1..],
1511 bounds,
1512 scene,
1513 );
1514 } else {
1515 self.paint_lines(self.start_y, &self.lines, bounds, scene);
1516 }
1517 }
1518
1519 fn paint_lines(
1520 &self,
1521 start_y: f32,
1522 lines: &[HighlightedRangeLine],
1523 bounds: RectF,
1524 scene: &mut Scene,
1525 ) {
1526 if lines.is_empty() {
1527 return;
1528 }
1529
1530 let mut path = PathBuilder::new();
1531 let first_line = lines.first().unwrap();
1532 let last_line = lines.last().unwrap();
1533
1534 let first_top_left = vec2f(first_line.start_x, start_y);
1535 let first_top_right = vec2f(first_line.end_x, start_y);
1536
1537 let curve_height = vec2f(0., self.corner_radius);
1538 let curve_width = |start_x: f32, end_x: f32| {
1539 let max = (end_x - start_x) / 2.;
1540 let width = if max < self.corner_radius {
1541 max
1542 } else {
1543 self.corner_radius
1544 };
1545
1546 vec2f(width, 0.)
1547 };
1548
1549 let top_curve_width = curve_width(first_line.start_x, first_line.end_x);
1550 path.reset(first_top_right - top_curve_width);
1551 path.curve_to(first_top_right + curve_height, first_top_right);
1552
1553 let mut iter = lines.iter().enumerate().peekable();
1554 while let Some((ix, line)) = iter.next() {
1555 let bottom_right = vec2f(line.end_x, start_y + (ix + 1) as f32 * self.line_height);
1556
1557 if let Some((_, next_line)) = iter.peek() {
1558 let next_top_right = vec2f(next_line.end_x, bottom_right.y());
1559
1560 match next_top_right.x().partial_cmp(&bottom_right.x()).unwrap() {
1561 Ordering::Equal => {
1562 path.line_to(bottom_right);
1563 }
1564 Ordering::Less => {
1565 let curve_width = curve_width(next_top_right.x(), bottom_right.x());
1566 path.line_to(bottom_right - curve_height);
1567 if self.corner_radius > 0. {
1568 path.curve_to(bottom_right - curve_width, bottom_right);
1569 }
1570 path.line_to(next_top_right + curve_width);
1571 if self.corner_radius > 0. {
1572 path.curve_to(next_top_right + curve_height, next_top_right);
1573 }
1574 }
1575 Ordering::Greater => {
1576 let curve_width = curve_width(bottom_right.x(), next_top_right.x());
1577 path.line_to(bottom_right - curve_height);
1578 if self.corner_radius > 0. {
1579 path.curve_to(bottom_right + curve_width, bottom_right);
1580 }
1581 path.line_to(next_top_right - curve_width);
1582 if self.corner_radius > 0. {
1583 path.curve_to(next_top_right + curve_height, next_top_right);
1584 }
1585 }
1586 }
1587 } else {
1588 let curve_width = curve_width(line.start_x, line.end_x);
1589 path.line_to(bottom_right - curve_height);
1590 if self.corner_radius > 0. {
1591 path.curve_to(bottom_right - curve_width, bottom_right);
1592 }
1593
1594 let bottom_left = vec2f(line.start_x, bottom_right.y());
1595 path.line_to(bottom_left + curve_width);
1596 if self.corner_radius > 0. {
1597 path.curve_to(bottom_left - curve_height, bottom_left);
1598 }
1599 }
1600 }
1601
1602 if first_line.start_x > last_line.start_x {
1603 let curve_width = curve_width(last_line.start_x, first_line.start_x);
1604 let second_top_left = vec2f(last_line.start_x, start_y + self.line_height);
1605 path.line_to(second_top_left + curve_height);
1606 if self.corner_radius > 0. {
1607 path.curve_to(second_top_left + curve_width, second_top_left);
1608 }
1609 let first_bottom_left = vec2f(first_line.start_x, second_top_left.y());
1610 path.line_to(first_bottom_left - curve_width);
1611 if self.corner_radius > 0. {
1612 path.curve_to(first_bottom_left - curve_height, first_bottom_left);
1613 }
1614 }
1615
1616 path.line_to(first_top_left + curve_height);
1617 if self.corner_radius > 0. {
1618 path.curve_to(first_top_left + top_curve_width, first_top_left);
1619 }
1620 path.line_to(first_top_right - top_curve_width);
1621
1622 scene.push_path(path.build(self.color, Some(bounds)));
1623 }
1624}
1625
1626fn scale_vertical_mouse_autoscroll_delta(delta: f32) -> f32 {
1627 delta.powf(1.5) / 100.0
1628}
1629
1630fn scale_horizontal_mouse_autoscroll_delta(delta: f32) -> f32 {
1631 delta.powf(1.2) / 300.0
1632}
1633
1634#[cfg(test)]
1635mod tests {
1636 use std::sync::Arc;
1637
1638 use super::*;
1639 use crate::{
1640 display_map::{BlockDisposition, BlockProperties},
1641 Editor, MultiBuffer,
1642 };
1643 use settings::Settings;
1644 use util::test::sample_text;
1645
1646 #[gpui::test]
1647 fn test_layout_line_numbers(cx: &mut gpui::MutableAppContext) {
1648 cx.set_global(Settings::test(cx));
1649 let buffer = MultiBuffer::build_simple(&sample_text(6, 6, 'a'), cx);
1650 let (window_id, editor) = cx.add_window(Default::default(), |cx| {
1651 Editor::new(EditorMode::Full, buffer, None, None, None, cx)
1652 });
1653 let element = EditorElement::new(
1654 editor.downgrade(),
1655 editor.read(cx).style(cx),
1656 CursorShape::Bar,
1657 );
1658
1659 let layouts = editor.update(cx, |editor, cx| {
1660 let snapshot = editor.snapshot(cx);
1661 let mut presenter = cx.build_presenter(window_id, 30.);
1662 let mut layout_cx = presenter.build_layout_context(Vector2F::zero(), false, cx);
1663 element.layout_line_numbers(0..6, &Default::default(), &snapshot, &mut layout_cx)
1664 });
1665 assert_eq!(layouts.len(), 6);
1666 }
1667
1668 #[gpui::test]
1669 fn test_layout_with_placeholder_text_and_blocks(cx: &mut gpui::MutableAppContext) {
1670 cx.set_global(Settings::test(cx));
1671 let buffer = MultiBuffer::build_simple("", cx);
1672 let (window_id, editor) = cx.add_window(Default::default(), |cx| {
1673 Editor::new(EditorMode::Full, buffer, None, None, None, cx)
1674 });
1675
1676 editor.update(cx, |editor, cx| {
1677 editor.set_placeholder_text("hello", cx);
1678 editor.insert_blocks(
1679 [BlockProperties {
1680 disposition: BlockDisposition::Above,
1681 height: 3,
1682 position: Anchor::min(),
1683 render: Arc::new(|_| Empty::new().boxed()),
1684 }],
1685 cx,
1686 );
1687
1688 // Blur the editor so that it displays placeholder text.
1689 cx.blur();
1690 });
1691
1692 let mut element = EditorElement::new(
1693 editor.downgrade(),
1694 editor.read(cx).style(cx),
1695 CursorShape::Bar,
1696 );
1697
1698 let mut scene = Scene::new(1.0);
1699 let mut presenter = cx.build_presenter(window_id, 30.);
1700 let mut layout_cx = presenter.build_layout_context(Vector2F::zero(), false, cx);
1701 let (size, mut state) = element.layout(
1702 SizeConstraint::new(vec2f(500., 500.), vec2f(500., 500.)),
1703 &mut layout_cx,
1704 );
1705
1706 assert_eq!(state.line_layouts.len(), 4);
1707 assert_eq!(
1708 state
1709 .line_number_layouts
1710 .iter()
1711 .map(Option::is_some)
1712 .collect::<Vec<_>>(),
1713 &[false, false, false, true]
1714 );
1715
1716 // Don't panic.
1717 let bounds = RectF::new(Default::default(), size);
1718 let mut paint_cx = presenter.build_paint_context(&mut scene, bounds.size(), cx);
1719 element.paint(bounds, bounds, &mut state, &mut paint_cx);
1720 }
1721}