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::{BlockStyle, DisplaySnapshot, TransformBlock},
8 hover_popover::HoverAt,
9 EditorStyle,
10};
11use clock::ReplicaId;
12use collections::{BTreeMap, HashMap};
13use gpui::{
14 color::Color,
15 elements::*,
16 fonts::{HighlightStyle, Underline},
17 geometry::{
18 rect::RectF,
19 vector::{vec2f, Vector2F},
20 PathBuilder,
21 },
22 json::{self, ToJson},
23 platform::CursorStyle,
24 text_layout::{self, Line, RunStyle, TextLayoutCache},
25 AppContext, Axis, Border, CursorRegion, Element, ElementBox, Event, EventContext,
26 LayoutContext, MutableAppContext, PaintContext, Quad, Scene, SizeConstraint, ViewContext,
27 WeakViewHandle,
28};
29use json::json;
30use language::{Bias, DiagnosticSeverity, Selection};
31use project::ProjectPath;
32use settings::Settings;
33use smallvec::SmallVec;
34use std::{
35 cmp::{self, Ordering},
36 fmt::Write,
37 iter,
38 ops::Range,
39};
40
41struct SelectionLayout {
42 head: DisplayPoint,
43 range: Range<DisplayPoint>,
44}
45
46impl SelectionLayout {
47 fn new<T: ToPoint + ToDisplayPoint + Clone>(
48 selection: Selection<T>,
49 line_mode: bool,
50 map: &DisplaySnapshot,
51 ) -> Self {
52 if line_mode {
53 let selection = selection.map(|p| p.to_point(&map.buffer_snapshot));
54 let point_range = map.expand_to_line(selection.range());
55 Self {
56 head: selection.head().to_display_point(map),
57 range: point_range.start.to_display_point(map)
58 ..point_range.end.to_display_point(map),
59 }
60 } else {
61 let selection = selection.map(|p| p.to_display_point(map));
62 Self {
63 head: selection.head(),
64 range: selection.range(),
65 }
66 }
67 }
68}
69
70pub struct EditorElement {
71 view: WeakViewHandle<Editor>,
72 style: EditorStyle,
73 cursor_shape: CursorShape,
74}
75
76impl EditorElement {
77 pub fn new(
78 view: WeakViewHandle<Editor>,
79 style: EditorStyle,
80 cursor_shape: CursorShape,
81 ) -> Self {
82 Self {
83 view,
84 style,
85 cursor_shape,
86 }
87 }
88
89 fn view<'a>(&self, cx: &'a AppContext) -> &'a Editor {
90 self.view.upgrade(cx).unwrap().read(cx)
91 }
92
93 fn update_view<F, T>(&self, cx: &mut MutableAppContext, f: F) -> T
94 where
95 F: FnOnce(&mut Editor, &mut ViewContext<Editor>) -> T,
96 {
97 self.view.upgrade(cx).unwrap().update(cx, f)
98 }
99
100 fn snapshot(&self, cx: &mut MutableAppContext) -> EditorSnapshot {
101 self.update_view(cx, |view, cx| view.snapshot(cx))
102 }
103
104 fn mouse_down(
105 &self,
106 position: Vector2F,
107 _: bool,
108 alt: bool,
109 shift: bool,
110 mut click_count: usize,
111 layout: &mut LayoutState,
112 paint: &mut PaintState,
113 cx: &mut EventContext,
114 ) -> bool {
115 if paint.gutter_bounds.contains_point(position) {
116 click_count = 3; // Simulate triple-click when clicking the gutter to select lines
117 } else if !paint.text_bounds.contains_point(position) {
118 return false;
119 }
120
121 let snapshot = self.snapshot(cx.app);
122 let (position, overshoot) = paint.point_for_position(&snapshot, layout, position);
123
124 if shift && alt {
125 cx.dispatch_action(Select(SelectPhase::BeginColumnar {
126 position,
127 overshoot: overshoot.column(),
128 }));
129 } else if shift {
130 cx.dispatch_action(Select(SelectPhase::Extend {
131 position,
132 click_count,
133 }));
134 } else {
135 cx.dispatch_action(Select(SelectPhase::Begin {
136 position,
137 add: alt,
138 click_count,
139 }));
140 }
141
142 true
143 }
144
145 fn mouse_up(&self, _position: Vector2F, cx: &mut EventContext) -> bool {
146 if self.view(cx.app.as_ref()).is_selecting() {
147 cx.dispatch_action(Select(SelectPhase::End));
148 true
149 } else {
150 false
151 }
152 }
153
154 fn mouse_dragged(
155 &self,
156 position: Vector2F,
157 layout: &mut LayoutState,
158 paint: &mut PaintState,
159 cx: &mut EventContext,
160 ) -> bool {
161 let view = self.view(cx.app.as_ref());
162
163 if view.is_selecting() {
164 let rect = paint.text_bounds;
165 let mut scroll_delta = Vector2F::zero();
166
167 let vertical_margin = layout.line_height.min(rect.height() / 3.0);
168 let top = rect.origin_y() + vertical_margin;
169 let bottom = rect.lower_left().y() - vertical_margin;
170 if position.y() < top {
171 scroll_delta.set_y(-scale_vertical_mouse_autoscroll_delta(top - position.y()))
172 }
173 if position.y() > bottom {
174 scroll_delta.set_y(scale_vertical_mouse_autoscroll_delta(position.y() - bottom))
175 }
176
177 let horizontal_margin = layout.line_height.min(rect.width() / 3.0);
178 let left = rect.origin_x() + horizontal_margin;
179 let right = rect.upper_right().x() - horizontal_margin;
180 if position.x() < left {
181 scroll_delta.set_x(-scale_horizontal_mouse_autoscroll_delta(
182 left - position.x(),
183 ))
184 }
185 if position.x() > right {
186 scroll_delta.set_x(scale_horizontal_mouse_autoscroll_delta(
187 position.x() - right,
188 ))
189 }
190
191 let snapshot = self.snapshot(cx.app);
192 let (position, overshoot) = paint.point_for_position(&snapshot, layout, position);
193
194 cx.dispatch_action(Select(SelectPhase::Update {
195 position,
196 overshoot: overshoot.column(),
197 scroll_position: (snapshot.scroll_position() + scroll_delta)
198 .clamp(Vector2F::zero(), layout.scroll_max),
199 }));
200 true
201 } else {
202 false
203 }
204 }
205
206 fn key_down(&self, input: Option<&str>, cx: &mut EventContext) -> bool {
207 let view = self.view.upgrade(cx.app).unwrap();
208
209 if view.is_focused(cx.app) {
210 if let Some(input) = input {
211 cx.dispatch_action(Input(input.to_string()));
212 true
213 } else {
214 false
215 }
216 } else {
217 false
218 }
219 }
220
221 fn scroll(
222 &self,
223 position: Vector2F,
224 mut delta: Vector2F,
225 precise: bool,
226 layout: &mut LayoutState,
227 paint: &mut PaintState,
228 cx: &mut EventContext,
229 ) -> bool {
230 if !paint.bounds.contains_point(position) {
231 return false;
232 }
233
234 let snapshot = self.snapshot(cx.app);
235 let max_glyph_width = layout.em_width;
236 if !precise {
237 delta *= vec2f(max_glyph_width, layout.line_height);
238 }
239
240 let scroll_position = snapshot.scroll_position();
241 let x = (scroll_position.x() * max_glyph_width - delta.x()) / max_glyph_width;
242 let y = (scroll_position.y() * layout.line_height - delta.y()) / layout.line_height;
243 let scroll_position = vec2f(x, y).clamp(Vector2F::zero(), layout.scroll_max);
244
245 cx.dispatch_action(Scroll(scroll_position));
246
247 true
248 }
249
250 fn paint_background(
251 &self,
252 gutter_bounds: RectF,
253 text_bounds: RectF,
254 layout: &LayoutState,
255 cx: &mut PaintContext,
256 ) {
257 let bounds = gutter_bounds.union_rect(text_bounds);
258 let scroll_top = layout.snapshot.scroll_position().y() * layout.line_height;
259 let editor = self.view(cx.app);
260 cx.scene.push_quad(Quad {
261 bounds: gutter_bounds,
262 background: Some(self.style.gutter_background),
263 border: Border::new(0., Color::transparent_black()),
264 corner_radius: 0.,
265 });
266 cx.scene.push_quad(Quad {
267 bounds: text_bounds,
268 background: Some(self.style.background),
269 border: Border::new(0., Color::transparent_black()),
270 corner_radius: 0.,
271 });
272
273 if let EditorMode::Full = editor.mode {
274 let mut active_rows = layout.active_rows.iter().peekable();
275 while let Some((start_row, contains_non_empty_selection)) = active_rows.next() {
276 let mut end_row = *start_row;
277 while active_rows.peek().map_or(false, |r| {
278 *r.0 == end_row + 1 && r.1 == contains_non_empty_selection
279 }) {
280 active_rows.next().unwrap();
281 end_row += 1;
282 }
283
284 if !contains_non_empty_selection {
285 let origin = vec2f(
286 bounds.origin_x(),
287 bounds.origin_y() + (layout.line_height * *start_row as f32) - scroll_top,
288 );
289 let size = vec2f(
290 bounds.width(),
291 layout.line_height * (end_row - start_row + 1) as f32,
292 );
293 cx.scene.push_quad(Quad {
294 bounds: RectF::new(origin, size),
295 background: Some(self.style.active_line_background),
296 border: Border::default(),
297 corner_radius: 0.,
298 });
299 }
300 }
301
302 if let Some(highlighted_rows) = &layout.highlighted_rows {
303 let origin = vec2f(
304 bounds.origin_x(),
305 bounds.origin_y() + (layout.line_height * highlighted_rows.start as f32)
306 - scroll_top,
307 );
308 let size = vec2f(
309 bounds.width(),
310 layout.line_height * highlighted_rows.len() as f32,
311 );
312 cx.scene.push_quad(Quad {
313 bounds: RectF::new(origin, size),
314 background: Some(self.style.highlighted_line_background),
315 border: Border::default(),
316 corner_radius: 0.,
317 });
318 }
319 }
320 }
321
322 fn paint_gutter(
323 &mut self,
324 bounds: RectF,
325 visible_bounds: RectF,
326 layout: &mut LayoutState,
327 cx: &mut PaintContext,
328 ) {
329 let scroll_top = layout.snapshot.scroll_position().y() * layout.line_height;
330 for (ix, line) in layout.line_number_layouts.iter().enumerate() {
331 if let Some(line) = line {
332 let line_origin = bounds.origin()
333 + vec2f(
334 bounds.width() - line.width() - layout.gutter_padding,
335 ix as f32 * layout.line_height - (scroll_top % layout.line_height),
336 );
337 line.paint(line_origin, visible_bounds, layout.line_height, cx);
338 }
339 }
340
341 if let Some((row, indicator)) = layout.code_actions_indicator.as_mut() {
342 let mut x = bounds.width() - layout.gutter_padding;
343 let mut y = *row as f32 * layout.line_height - scroll_top;
344 x += ((layout.gutter_padding + layout.gutter_margin) - indicator.size().x()) / 2.;
345 y += (layout.line_height - indicator.size().y()) / 2.;
346 indicator.paint(bounds.origin() + vec2f(x, y), visible_bounds, cx);
347 }
348 }
349
350 fn paint_text(
351 &mut self,
352 bounds: RectF,
353 visible_bounds: RectF,
354 layout: &mut LayoutState,
355 paint: &mut PaintState,
356 cx: &mut PaintContext,
357 ) {
358 let view = self.view(cx.app);
359 let style = &self.style;
360 let local_replica_id = view.replica_id(cx);
361 let scroll_position = layout.snapshot.scroll_position();
362 let start_row = scroll_position.y() as u32;
363 let scroll_top = scroll_position.y() * layout.line_height;
364 let end_row = ((scroll_top + bounds.height()) / layout.line_height).ceil() as u32 + 1; // Add 1 to ensure selections bleed off screen
365 let max_glyph_width = layout.em_width;
366 let scroll_left = scroll_position.x() * max_glyph_width;
367 let content_origin = bounds.origin() + vec2f(layout.gutter_margin, 0.);
368
369 cx.scene.push_layer(Some(bounds));
370 cx.scene.push_cursor_region(CursorRegion {
371 bounds,
372 style: CursorStyle::IBeam,
373 });
374
375 for (range, color) in &layout.highlighted_ranges {
376 self.paint_highlighted_range(
377 range.clone(),
378 start_row,
379 end_row,
380 *color,
381 0.,
382 0.15 * layout.line_height,
383 layout,
384 content_origin,
385 scroll_top,
386 scroll_left,
387 bounds,
388 cx,
389 );
390 }
391
392 let mut cursors = SmallVec::<[Cursor; 32]>::new();
393 for (replica_id, selections) in &layout.selections {
394 let selection_style = style.replica_selection_style(*replica_id);
395 let corner_radius = 0.15 * layout.line_height;
396
397 for selection in selections {
398 self.paint_highlighted_range(
399 selection.range.clone(),
400 start_row,
401 end_row,
402 selection_style.selection,
403 corner_radius,
404 corner_radius * 2.,
405 layout,
406 content_origin,
407 scroll_top,
408 scroll_left,
409 bounds,
410 cx,
411 );
412
413 if view.show_local_cursors() || *replica_id != local_replica_id {
414 let cursor_position = selection.head;
415 if (start_row..end_row).contains(&cursor_position.row()) {
416 let cursor_row_layout =
417 &layout.line_layouts[(cursor_position.row() - start_row) as usize];
418 let cursor_column = cursor_position.column() as usize;
419
420 let cursor_character_x = cursor_row_layout.x_for_index(cursor_column);
421 let mut block_width =
422 cursor_row_layout.x_for_index(cursor_column + 1) - cursor_character_x;
423 if block_width == 0.0 {
424 block_width = layout.em_width;
425 }
426
427 let block_text =
428 if matches!(self.cursor_shape, CursorShape::Block) {
429 layout.snapshot.chars_at(cursor_position).next().and_then(
430 |character| {
431 let font_id =
432 cursor_row_layout.font_for_index(cursor_column)?;
433 let text = character.to_string();
434
435 Some(cx.text_layout_cache.layout_str(
436 &text,
437 cursor_row_layout.font_size(),
438 &[(
439 text.len(),
440 RunStyle {
441 font_id,
442 color: style.background,
443 underline: Default::default(),
444 },
445 )],
446 ))
447 },
448 )
449 } else {
450 None
451 };
452
453 let x = cursor_character_x - scroll_left;
454 let y = cursor_position.row() as f32 * layout.line_height - scroll_top;
455 cursors.push(Cursor {
456 color: selection_style.cursor,
457 block_width,
458 origin: content_origin + vec2f(x, y),
459 line_height: layout.line_height,
460 shape: self.cursor_shape,
461 block_text,
462 });
463 }
464 }
465 }
466 }
467
468 if let Some(visible_text_bounds) = bounds.intersection(visible_bounds) {
469 // Draw glyphs
470 for (ix, line) in layout.line_layouts.iter().enumerate() {
471 let row = start_row + ix as u32;
472 line.paint(
473 content_origin
474 + vec2f(-scroll_left, row as f32 * layout.line_height - scroll_top),
475 visible_text_bounds,
476 layout.line_height,
477 cx,
478 );
479 }
480 }
481
482 cx.scene.push_layer(Some(bounds));
483 for cursor in cursors {
484 cursor.paint(cx);
485 }
486 cx.scene.pop_layer();
487
488 if let Some((position, context_menu)) = layout.context_menu.as_mut() {
489 cx.scene.push_stacking_context(None);
490
491 let cursor_row_layout = &layout.line_layouts[(position.row() - start_row) as usize];
492 let x = cursor_row_layout.x_for_index(position.column() as usize) - scroll_left;
493 let y = (position.row() + 1) as f32 * layout.line_height - scroll_top;
494 let mut list_origin = content_origin + vec2f(x, y);
495 let list_width = context_menu.size().x();
496 let list_height = context_menu.size().y();
497
498 // Snap the right edge of the list to the right edge of the window if
499 // its horizontal bounds overflow.
500 if list_origin.x() + list_width > cx.window_size.x() {
501 list_origin.set_x((cx.window_size.x() - list_width).max(0.));
502 }
503
504 if list_origin.y() + list_height > bounds.max_y() {
505 list_origin.set_y(list_origin.y() - layout.line_height - list_height);
506 }
507
508 context_menu.paint(
509 list_origin,
510 RectF::from_points(Vector2F::zero(), vec2f(f32::MAX, f32::MAX)), // Let content bleed outside of editor
511 cx,
512 );
513
514 paint.context_menu_bounds = Some(RectF::new(list_origin, context_menu.size()));
515
516 cx.scene.pop_stacking_context();
517 }
518
519 if let Some((position, hover_popover)) = layout.hover.as_mut() {
520 cx.scene.push_stacking_context(None);
521
522 // This is safe because we check on layout whether the required row is available
523 let hovered_row_layout = &layout.line_layouts[(position.row() - start_row) as usize];
524 let size = hover_popover.size();
525 let x = hovered_row_layout.x_for_index(position.column() as usize) - scroll_left;
526 let y = position.row() as f32 * layout.line_height - scroll_top - size.y();
527 let mut popover_origin = content_origin + vec2f(x, y);
528
529 if popover_origin.y() < 0.0 {
530 popover_origin.set_y(popover_origin.y() + layout.line_height + size.y());
531 }
532
533 let x_out_of_bounds = bounds.max_x() - (popover_origin.x() + size.x());
534 if x_out_of_bounds < 0.0 {
535 popover_origin.set_x(popover_origin.x() + x_out_of_bounds);
536 }
537
538 hover_popover.paint(
539 popover_origin,
540 RectF::from_points(Vector2F::zero(), vec2f(f32::MAX, f32::MAX)), // Let content bleed outside of editor
541 cx,
542 );
543
544 paint.hover_bounds = Some(
545 RectF::new(popover_origin, hover_popover.size()).dilate(Vector2F::new(0., 5.)),
546 );
547
548 cx.scene.pop_stacking_context();
549 }
550
551 cx.scene.pop_layer();
552 }
553
554 fn paint_highlighted_range(
555 &self,
556 range: Range<DisplayPoint>,
557 start_row: u32,
558 end_row: u32,
559 color: Color,
560 corner_radius: f32,
561 line_end_overshoot: f32,
562 layout: &LayoutState,
563 content_origin: Vector2F,
564 scroll_top: f32,
565 scroll_left: f32,
566 bounds: RectF,
567 cx: &mut PaintContext,
568 ) {
569 if range.start != range.end {
570 let row_range = if range.end.column() == 0 {
571 cmp::max(range.start.row(), start_row)..cmp::min(range.end.row(), end_row)
572 } else {
573 cmp::max(range.start.row(), start_row)..cmp::min(range.end.row() + 1, end_row)
574 };
575
576 let highlighted_range = HighlightedRange {
577 color,
578 line_height: layout.line_height,
579 corner_radius,
580 start_y: content_origin.y() + row_range.start as f32 * layout.line_height
581 - scroll_top,
582 lines: row_range
583 .into_iter()
584 .map(|row| {
585 let line_layout = &layout.line_layouts[(row - start_row) as usize];
586 HighlightedRangeLine {
587 start_x: if row == range.start.row() {
588 content_origin.x()
589 + line_layout.x_for_index(range.start.column() as usize)
590 - scroll_left
591 } else {
592 content_origin.x() - scroll_left
593 },
594 end_x: if row == range.end.row() {
595 content_origin.x()
596 + line_layout.x_for_index(range.end.column() as usize)
597 - scroll_left
598 } else {
599 content_origin.x() + line_layout.width() + line_end_overshoot
600 - scroll_left
601 },
602 }
603 })
604 .collect(),
605 };
606
607 highlighted_range.paint(bounds, cx.scene);
608 }
609 }
610
611 fn paint_blocks(
612 &mut self,
613 bounds: RectF,
614 visible_bounds: RectF,
615 layout: &mut LayoutState,
616 cx: &mut PaintContext,
617 ) {
618 let scroll_position = layout.snapshot.scroll_position();
619 let scroll_left = scroll_position.x() * layout.em_width;
620 let scroll_top = scroll_position.y() * layout.line_height;
621
622 for block in &mut layout.blocks {
623 let mut origin =
624 bounds.origin() + vec2f(0., block.row as f32 * layout.line_height - scroll_top);
625 if !matches!(block.style, BlockStyle::Sticky) {
626 origin += vec2f(-scroll_left, 0.);
627 }
628 block.element.paint(origin, visible_bounds, cx);
629 }
630 }
631
632 fn max_line_number_width(&self, snapshot: &EditorSnapshot, cx: &LayoutContext) -> f32 {
633 let digit_count = (snapshot.max_buffer_row() as f32).log10().floor() as usize + 1;
634 let style = &self.style;
635
636 cx.text_layout_cache
637 .layout_str(
638 "1".repeat(digit_count).as_str(),
639 style.text.font_size,
640 &[(
641 digit_count,
642 RunStyle {
643 font_id: style.text.font_id,
644 color: Color::black(),
645 underline: Default::default(),
646 },
647 )],
648 )
649 .width()
650 }
651
652 fn layout_line_numbers(
653 &self,
654 rows: Range<u32>,
655 active_rows: &BTreeMap<u32, bool>,
656 snapshot: &EditorSnapshot,
657 cx: &LayoutContext,
658 ) -> Vec<Option<text_layout::Line>> {
659 let style = &self.style;
660 let include_line_numbers = snapshot.mode == EditorMode::Full;
661 let mut line_number_layouts = Vec::with_capacity(rows.len());
662 let mut line_number = String::new();
663 for (ix, row) in snapshot
664 .buffer_rows(rows.start)
665 .take((rows.end - rows.start) as usize)
666 .enumerate()
667 {
668 let display_row = rows.start + ix as u32;
669 let color = if active_rows.contains_key(&display_row) {
670 style.line_number_active
671 } else {
672 style.line_number
673 };
674 if let Some(buffer_row) = row {
675 if include_line_numbers {
676 line_number.clear();
677 write!(&mut line_number, "{}", buffer_row + 1).unwrap();
678 line_number_layouts.push(Some(cx.text_layout_cache.layout_str(
679 &line_number,
680 style.text.font_size,
681 &[(
682 line_number.len(),
683 RunStyle {
684 font_id: style.text.font_id,
685 color,
686 underline: Default::default(),
687 },
688 )],
689 )));
690 }
691 } else {
692 line_number_layouts.push(None);
693 }
694 }
695
696 line_number_layouts
697 }
698
699 fn layout_lines(
700 &mut self,
701 rows: Range<u32>,
702 snapshot: &EditorSnapshot,
703 cx: &LayoutContext,
704 ) -> Vec<text_layout::Line> {
705 if rows.start >= rows.end {
706 return Vec::new();
707 }
708
709 // When the editor is empty and unfocused, then show the placeholder.
710 if snapshot.is_empty() && !snapshot.is_focused() {
711 let placeholder_style = self
712 .style
713 .placeholder_text
714 .as_ref()
715 .unwrap_or_else(|| &self.style.text);
716 let placeholder_text = snapshot.placeholder_text();
717 let placeholder_lines = placeholder_text
718 .as_ref()
719 .map_or("", AsRef::as_ref)
720 .split('\n')
721 .skip(rows.start as usize)
722 .chain(iter::repeat(""))
723 .take(rows.len());
724 return placeholder_lines
725 .map(|line| {
726 cx.text_layout_cache.layout_str(
727 line,
728 placeholder_style.font_size,
729 &[(
730 line.len(),
731 RunStyle {
732 font_id: placeholder_style.font_id,
733 color: placeholder_style.color,
734 underline: Default::default(),
735 },
736 )],
737 )
738 })
739 .collect();
740 } else {
741 let style = &self.style;
742 let chunks = snapshot.chunks(rows.clone(), true).map(|chunk| {
743 let mut highlight_style = chunk
744 .syntax_highlight_id
745 .and_then(|id| id.style(&style.syntax));
746
747 if let Some(chunk_highlight) = chunk.highlight_style {
748 if let Some(highlight_style) = highlight_style.as_mut() {
749 highlight_style.highlight(chunk_highlight);
750 } else {
751 highlight_style = Some(chunk_highlight);
752 }
753 }
754
755 let mut diagnostic_highlight = HighlightStyle::default();
756
757 if chunk.is_unnecessary {
758 diagnostic_highlight.fade_out = Some(style.unnecessary_code_fade);
759 }
760
761 if let Some(severity) = chunk.diagnostic_severity {
762 // Omit underlines for HINT/INFO diagnostics on 'unnecessary' code.
763 if severity <= DiagnosticSeverity::WARNING || !chunk.is_unnecessary {
764 let diagnostic_style = super::diagnostic_style(severity, true, style);
765 diagnostic_highlight.underline = Some(Underline {
766 color: Some(diagnostic_style.message.text.color),
767 thickness: 1.0.into(),
768 squiggly: true,
769 });
770 }
771 }
772
773 if let Some(highlight_style) = highlight_style.as_mut() {
774 highlight_style.highlight(diagnostic_highlight);
775 } else {
776 highlight_style = Some(diagnostic_highlight);
777 }
778
779 (chunk.text, highlight_style)
780 });
781 layout_highlighted_chunks(
782 chunks,
783 &style.text,
784 &cx.text_layout_cache,
785 &cx.font_cache,
786 MAX_LINE_LEN,
787 rows.len() as usize,
788 )
789 }
790 }
791
792 fn layout_blocks(
793 &mut self,
794 rows: Range<u32>,
795 snapshot: &EditorSnapshot,
796 editor_width: f32,
797 scroll_width: f32,
798 gutter_padding: f32,
799 gutter_width: f32,
800 em_width: f32,
801 text_x: f32,
802 line_height: f32,
803 style: &EditorStyle,
804 line_layouts: &[text_layout::Line],
805 cx: &mut LayoutContext,
806 ) -> (f32, Vec<BlockLayout>) {
807 let editor = if let Some(editor) = self.view.upgrade(cx) {
808 editor
809 } else {
810 return Default::default();
811 };
812
813 let tooltip_style = cx.global::<Settings>().theme.tooltip.clone();
814 let scroll_x = snapshot.scroll_position.x();
815 let (fixed_blocks, non_fixed_blocks) = snapshot
816 .blocks_in_range(rows.clone())
817 .partition::<Vec<_>, _>(|(_, block)| match block {
818 TransformBlock::ExcerptHeader { .. } => false,
819 TransformBlock::Custom(block) => block.style() == BlockStyle::Fixed,
820 });
821 let mut render_block = |block: &TransformBlock, width: f32| {
822 let mut element = match block {
823 TransformBlock::Custom(block) => {
824 let align_to = block
825 .position()
826 .to_point(&snapshot.buffer_snapshot)
827 .to_display_point(snapshot);
828 let anchor_x = text_x
829 + if rows.contains(&align_to.row()) {
830 line_layouts[(align_to.row() - rows.start) as usize]
831 .x_for_index(align_to.column() as usize)
832 } else {
833 layout_line(align_to.row(), snapshot, style, cx.text_layout_cache)
834 .x_for_index(align_to.column() as usize)
835 };
836
837 cx.render(&editor, |_, cx| {
838 block.render(&mut BlockContext {
839 cx,
840 anchor_x,
841 gutter_padding,
842 line_height,
843 scroll_x,
844 gutter_width,
845 em_width,
846 })
847 })
848 }
849 TransformBlock::ExcerptHeader {
850 key,
851 buffer,
852 range,
853 starts_new_buffer,
854 ..
855 } => {
856 let jump_icon = project::File::from_dyn(buffer.file()).map(|file| {
857 let jump_position = range
858 .primary
859 .as_ref()
860 .map_or(range.context.start, |primary| primary.start);
861 let jump_action = crate::Jump {
862 path: ProjectPath {
863 worktree_id: file.worktree_id(cx),
864 path: file.path.clone(),
865 },
866 position: language::ToPoint::to_point(&jump_position, buffer),
867 anchor: jump_position,
868 };
869
870 enum JumpIcon {}
871 cx.render(&editor, |_, cx| {
872 MouseEventHandler::new::<JumpIcon, _, _>(*key, cx, |state, _| {
873 let style = style.jump_icon.style_for(state, false);
874 Svg::new("icons/jump.svg")
875 .with_color(style.color)
876 .constrained()
877 .with_width(style.icon_width)
878 .aligned()
879 .contained()
880 .with_style(style.container)
881 .constrained()
882 .with_width(style.button_width)
883 .with_height(style.button_width)
884 .boxed()
885 })
886 .with_cursor_style(CursorStyle::PointingHand)
887 .on_click(move |_, _, cx| cx.dispatch_action(jump_action.clone()))
888 .with_tooltip::<JumpIcon, _>(
889 *key,
890 "Jump to Buffer".to_string(),
891 Some(Box::new(crate::OpenExcerpts)),
892 tooltip_style.clone(),
893 cx,
894 )
895 .aligned()
896 .flex_float()
897 .boxed()
898 })
899 });
900
901 if *starts_new_buffer {
902 let style = &self.style.diagnostic_path_header;
903 let font_size =
904 (style.text_scale_factor * self.style.text.font_size).round();
905
906 let mut filename = None;
907 let mut parent_path = None;
908 if let Some(file) = buffer.file() {
909 let path = file.path();
910 filename = path.file_name().map(|f| f.to_string_lossy().to_string());
911 parent_path =
912 path.parent().map(|p| p.to_string_lossy().to_string() + "/");
913 }
914
915 Flex::row()
916 .with_child(
917 Label::new(
918 filename.unwrap_or_else(|| "untitled".to_string()),
919 style.filename.text.clone().with_font_size(font_size),
920 )
921 .contained()
922 .with_style(style.filename.container)
923 .aligned()
924 .boxed(),
925 )
926 .with_children(parent_path.map(|path| {
927 Label::new(path, style.path.text.clone().with_font_size(font_size))
928 .contained()
929 .with_style(style.path.container)
930 .aligned()
931 .boxed()
932 }))
933 .with_children(jump_icon)
934 .contained()
935 .with_style(style.container)
936 .with_padding_left(gutter_padding)
937 .with_padding_right(gutter_padding)
938 .expanded()
939 .named("path header block")
940 } else {
941 let text_style = self.style.text.clone();
942 Flex::row()
943 .with_child(Label::new("…".to_string(), text_style).boxed())
944 .with_children(jump_icon)
945 .contained()
946 .with_padding_left(gutter_padding)
947 .with_padding_right(gutter_padding)
948 .expanded()
949 .named("collapsed context")
950 }
951 }
952 };
953
954 element.layout(
955 SizeConstraint {
956 min: Vector2F::zero(),
957 max: vec2f(width, block.height() as f32 * line_height),
958 },
959 cx,
960 );
961 element
962 };
963
964 let mut fixed_block_max_width = 0f32;
965 let mut blocks = Vec::new();
966 for (row, block) in fixed_blocks {
967 let element = render_block(block, f32::INFINITY);
968 fixed_block_max_width = fixed_block_max_width.max(element.size().x() + em_width);
969 blocks.push(BlockLayout {
970 row,
971 element,
972 style: BlockStyle::Fixed,
973 });
974 }
975 for (row, block) in non_fixed_blocks {
976 let style = match block {
977 TransformBlock::Custom(block) => block.style(),
978 TransformBlock::ExcerptHeader { .. } => BlockStyle::Sticky,
979 };
980 let width = match style {
981 BlockStyle::Sticky => editor_width,
982 BlockStyle::Flex => editor_width
983 .max(fixed_block_max_width)
984 .max(gutter_width + scroll_width),
985 BlockStyle::Fixed => unreachable!(),
986 };
987 let element = render_block(block, width);
988 blocks.push(BlockLayout {
989 row,
990 element,
991 style,
992 });
993 }
994 (
995 scroll_width.max(fixed_block_max_width - gutter_width),
996 blocks,
997 )
998 }
999}
1000
1001impl Element for EditorElement {
1002 type LayoutState = LayoutState;
1003 type PaintState = PaintState;
1004
1005 fn layout(
1006 &mut self,
1007 constraint: SizeConstraint,
1008 cx: &mut LayoutContext,
1009 ) -> (Vector2F, Self::LayoutState) {
1010 let mut size = constraint.max;
1011 if size.x().is_infinite() {
1012 unimplemented!("we don't yet handle an infinite width constraint on buffer elements");
1013 }
1014
1015 let snapshot = self.snapshot(cx.app);
1016 let style = self.style.clone();
1017 let line_height = style.text.line_height(cx.font_cache);
1018
1019 let gutter_padding;
1020 let gutter_width;
1021 let gutter_margin;
1022 if snapshot.mode == EditorMode::Full {
1023 gutter_padding = style.text.em_width(cx.font_cache) * style.gutter_padding_factor;
1024 gutter_width = self.max_line_number_width(&snapshot, cx) + gutter_padding * 2.0;
1025 gutter_margin = -style.text.descent(cx.font_cache);
1026 } else {
1027 gutter_padding = 0.0;
1028 gutter_width = 0.0;
1029 gutter_margin = 0.0;
1030 };
1031
1032 let text_width = size.x() - gutter_width;
1033 let em_width = style.text.em_width(cx.font_cache);
1034 let em_advance = style.text.em_advance(cx.font_cache);
1035 let overscroll = vec2f(em_width, 0.);
1036 let snapshot = self.update_view(cx.app, |view, cx| {
1037 let wrap_width = match view.soft_wrap_mode(cx) {
1038 SoftWrap::None => Some((MAX_LINE_LEN / 2) as f32 * em_advance),
1039 SoftWrap::EditorWidth => {
1040 Some(text_width - gutter_margin - overscroll.x() - em_width)
1041 }
1042 SoftWrap::Column(column) => Some(column as f32 * em_advance),
1043 };
1044
1045 if view.set_wrap_width(wrap_width, cx) {
1046 view.snapshot(cx)
1047 } else {
1048 snapshot
1049 }
1050 });
1051
1052 let scroll_height = (snapshot.max_point().row() + 1) as f32 * line_height;
1053 if let EditorMode::AutoHeight { max_lines } = snapshot.mode {
1054 size.set_y(
1055 scroll_height
1056 .min(constraint.max_along(Axis::Vertical))
1057 .max(constraint.min_along(Axis::Vertical))
1058 .min(line_height * max_lines as f32),
1059 )
1060 } else if let EditorMode::SingleLine = snapshot.mode {
1061 size.set_y(
1062 line_height
1063 .min(constraint.max_along(Axis::Vertical))
1064 .max(constraint.min_along(Axis::Vertical)),
1065 )
1066 } else if size.y().is_infinite() {
1067 size.set_y(scroll_height);
1068 }
1069 let gutter_size = vec2f(gutter_width, size.y());
1070 let text_size = vec2f(text_width, size.y());
1071
1072 let (autoscroll_horizontally, mut snapshot) = self.update_view(cx.app, |view, cx| {
1073 let autoscroll_horizontally = view.autoscroll_vertically(size.y(), line_height, cx);
1074 let snapshot = view.snapshot(cx);
1075 (autoscroll_horizontally, snapshot)
1076 });
1077
1078 let scroll_position = snapshot.scroll_position();
1079 let start_row = scroll_position.y() as u32;
1080 let scroll_top = scroll_position.y() * line_height;
1081
1082 // Add 1 to ensure selections bleed off screen
1083 let end_row = 1 + cmp::min(
1084 ((scroll_top + size.y()) / line_height).ceil() as u32,
1085 snapshot.max_point().row(),
1086 );
1087
1088 let start_anchor = if start_row == 0 {
1089 Anchor::min()
1090 } else {
1091 snapshot
1092 .buffer_snapshot
1093 .anchor_before(DisplayPoint::new(start_row, 0).to_offset(&snapshot, Bias::Left))
1094 };
1095 let end_anchor = if end_row > snapshot.max_point().row() {
1096 Anchor::max()
1097 } else {
1098 snapshot
1099 .buffer_snapshot
1100 .anchor_before(DisplayPoint::new(end_row, 0).to_offset(&snapshot, Bias::Right))
1101 };
1102
1103 let mut selections: Vec<(ReplicaId, Vec<SelectionLayout>)> = Vec::new();
1104 let mut active_rows = BTreeMap::new();
1105 let mut highlighted_rows = None;
1106 let mut highlighted_ranges = Vec::new();
1107 self.update_view(cx.app, |view, cx| {
1108 let display_map = view.display_map.update(cx, |map, cx| map.snapshot(cx));
1109
1110 highlighted_rows = view.highlighted_rows();
1111 let theme = cx.global::<Settings>().theme.as_ref();
1112 highlighted_ranges = view.background_highlights_in_range(
1113 start_anchor.clone()..end_anchor.clone(),
1114 &display_map,
1115 theme,
1116 );
1117
1118 let mut remote_selections = HashMap::default();
1119 for (replica_id, line_mode, selection) in display_map
1120 .buffer_snapshot
1121 .remote_selections_in_range(&(start_anchor.clone()..end_anchor.clone()))
1122 {
1123 // The local selections match the leader's selections.
1124 if Some(replica_id) == view.leader_replica_id {
1125 continue;
1126 }
1127 remote_selections
1128 .entry(replica_id)
1129 .or_insert(Vec::new())
1130 .push(SelectionLayout::new(selection, line_mode, &display_map));
1131 }
1132 selections.extend(remote_selections);
1133
1134 if view.show_local_selections {
1135 let mut local_selections = view
1136 .selections
1137 .disjoint_in_range(start_anchor..end_anchor, cx);
1138 local_selections.extend(view.selections.pending(cx));
1139 for selection in &local_selections {
1140 let is_empty = selection.start == selection.end;
1141 let selection_start = snapshot.prev_line_boundary(selection.start).1;
1142 let selection_end = snapshot.next_line_boundary(selection.end).1;
1143 for row in cmp::max(selection_start.row(), start_row)
1144 ..=cmp::min(selection_end.row(), end_row)
1145 {
1146 let contains_non_empty_selection =
1147 active_rows.entry(row).or_insert(!is_empty);
1148 *contains_non_empty_selection |= !is_empty;
1149 }
1150 }
1151
1152 // Render the local selections in the leader's color when following.
1153 let local_replica_id = view.leader_replica_id.unwrap_or(view.replica_id(cx));
1154
1155 selections.push((
1156 local_replica_id,
1157 local_selections
1158 .into_iter()
1159 .map(|selection| {
1160 SelectionLayout::new(selection, view.selections.line_mode, &display_map)
1161 })
1162 .collect(),
1163 ));
1164 }
1165 });
1166
1167 let line_number_layouts =
1168 self.layout_line_numbers(start_row..end_row, &active_rows, &snapshot, cx);
1169
1170 let mut max_visible_line_width = 0.0;
1171 let line_layouts = self.layout_lines(start_row..end_row, &snapshot, cx);
1172 for line in &line_layouts {
1173 if line.width() > max_visible_line_width {
1174 max_visible_line_width = line.width();
1175 }
1176 }
1177
1178 let style = self.style.clone();
1179 let longest_line_width = layout_line(
1180 snapshot.longest_row(),
1181 &snapshot,
1182 &style,
1183 cx.text_layout_cache,
1184 )
1185 .width();
1186 let scroll_width = longest_line_width.max(max_visible_line_width) + overscroll.x();
1187 let em_width = style.text.em_width(cx.font_cache);
1188 let (scroll_width, blocks) = self.layout_blocks(
1189 start_row..end_row,
1190 &snapshot,
1191 size.x(),
1192 scroll_width,
1193 gutter_padding,
1194 gutter_width,
1195 em_width,
1196 gutter_width + gutter_margin,
1197 line_height,
1198 &style,
1199 &line_layouts,
1200 cx,
1201 );
1202
1203 let max_row = snapshot.max_point().row();
1204 let scroll_max = vec2f(
1205 ((scroll_width - text_size.x()) / em_width).max(0.0),
1206 max_row.saturating_sub(1) as f32,
1207 );
1208
1209 self.update_view(cx.app, |view, cx| {
1210 let clamped = view.clamp_scroll_left(scroll_max.x());
1211 let autoscrolled;
1212 if autoscroll_horizontally {
1213 autoscrolled = view.autoscroll_horizontally(
1214 start_row,
1215 text_size.x(),
1216 scroll_width,
1217 em_width,
1218 &line_layouts,
1219 cx,
1220 );
1221 } else {
1222 autoscrolled = false;
1223 }
1224
1225 if clamped || autoscrolled {
1226 snapshot = view.snapshot(cx);
1227 }
1228 });
1229
1230 let mut context_menu = None;
1231 let mut code_actions_indicator = None;
1232 let mut hover = None;
1233 cx.render(&self.view.upgrade(cx).unwrap(), |view, cx| {
1234 let newest_selection_head = view
1235 .selections
1236 .newest::<usize>(cx)
1237 .head()
1238 .to_display_point(&snapshot);
1239
1240 let style = view.style(cx);
1241 if (start_row..end_row).contains(&newest_selection_head.row()) {
1242 if view.context_menu_visible() {
1243 context_menu =
1244 view.render_context_menu(newest_selection_head, style.clone(), cx);
1245 }
1246
1247 code_actions_indicator = view
1248 .render_code_actions_indicator(&style, cx)
1249 .map(|indicator| (newest_selection_head.row(), indicator));
1250 }
1251
1252 hover = view.hover_state.popover.clone().and_then(|hover| {
1253 let (point, rendered) = hover.render(&snapshot, style.clone(), cx);
1254 if point.row() >= snapshot.scroll_position().y() as u32 {
1255 if line_layouts.len() > (point.row() - start_row) as usize {
1256 return Some((point, rendered));
1257 }
1258 }
1259
1260 None
1261 });
1262 });
1263
1264 if let Some((_, context_menu)) = context_menu.as_mut() {
1265 context_menu.layout(
1266 SizeConstraint {
1267 min: Vector2F::zero(),
1268 max: vec2f(
1269 cx.window_size.x() * 0.7,
1270 (12. * line_height).min((size.y() - line_height) / 2.),
1271 ),
1272 },
1273 cx,
1274 );
1275 }
1276
1277 if let Some((_, indicator)) = code_actions_indicator.as_mut() {
1278 indicator.layout(
1279 SizeConstraint::strict_along(Axis::Vertical, line_height * 0.618),
1280 cx,
1281 );
1282 }
1283
1284 if let Some((_, hover)) = hover.as_mut() {
1285 hover.layout(
1286 SizeConstraint {
1287 min: Vector2F::zero(),
1288 max: vec2f(
1289 (120. * em_width) // Default size
1290 .min(size.x() / 2.) // Shrink to half of the editor width
1291 .max(20. * em_width), // Apply minimum width of 20 characters
1292 (16. * line_height) // Default size
1293 .min(size.y() / 2.) // Shrink to half of the editor height
1294 .max(4. * line_height), // Apply minimum height of 4 lines
1295 ),
1296 },
1297 cx,
1298 );
1299 }
1300
1301 (
1302 size,
1303 LayoutState {
1304 size,
1305 scroll_max,
1306 gutter_size,
1307 gutter_padding,
1308 text_size,
1309 gutter_margin,
1310 snapshot,
1311 active_rows,
1312 highlighted_rows,
1313 highlighted_ranges,
1314 line_layouts,
1315 line_number_layouts,
1316 blocks,
1317 line_height,
1318 em_width,
1319 em_advance,
1320 selections,
1321 context_menu,
1322 code_actions_indicator,
1323 hover,
1324 },
1325 )
1326 }
1327
1328 fn paint(
1329 &mut self,
1330 bounds: RectF,
1331 visible_bounds: RectF,
1332 layout: &mut Self::LayoutState,
1333 cx: &mut PaintContext,
1334 ) -> Self::PaintState {
1335 cx.scene.push_layer(Some(bounds));
1336
1337 let gutter_bounds = RectF::new(bounds.origin(), layout.gutter_size);
1338 let text_bounds = RectF::new(
1339 bounds.origin() + vec2f(layout.gutter_size.x(), 0.0),
1340 layout.text_size,
1341 );
1342
1343 let mut paint_state = PaintState {
1344 bounds,
1345 gutter_bounds,
1346 text_bounds,
1347 context_menu_bounds: None,
1348 hover_bounds: None,
1349 };
1350
1351 self.paint_background(gutter_bounds, text_bounds, layout, cx);
1352 if layout.gutter_size.x() > 0. {
1353 self.paint_gutter(gutter_bounds, visible_bounds, layout, cx);
1354 }
1355 self.paint_text(text_bounds, visible_bounds, layout, &mut paint_state, cx);
1356
1357 if !layout.blocks.is_empty() {
1358 cx.scene.push_layer(Some(bounds));
1359 self.paint_blocks(bounds, visible_bounds, layout, cx);
1360 cx.scene.pop_layer();
1361 }
1362
1363 cx.scene.pop_layer();
1364
1365 paint_state
1366 }
1367
1368 fn dispatch_event(
1369 &mut self,
1370 event: &Event,
1371 _: RectF,
1372 _: RectF,
1373 layout: &mut LayoutState,
1374 paint: &mut PaintState,
1375 cx: &mut EventContext,
1376 ) -> bool {
1377 if let Some((_, context_menu)) = &mut layout.context_menu {
1378 if context_menu.dispatch_event(event, cx) {
1379 return true;
1380 }
1381 }
1382
1383 if let Some((_, indicator)) = &mut layout.code_actions_indicator {
1384 if indicator.dispatch_event(event, cx) {
1385 return true;
1386 }
1387 }
1388
1389 if let Some((_, hover)) = &mut layout.hover {
1390 if hover.dispatch_event(event, cx) {
1391 return true;
1392 }
1393 }
1394
1395 for block in &mut layout.blocks {
1396 if block.element.dispatch_event(event, cx) {
1397 return true;
1398 }
1399 }
1400
1401 match event {
1402 Event::LeftMouseDown {
1403 position,
1404 cmd,
1405 alt,
1406 shift,
1407 click_count,
1408 ..
1409 } => self.mouse_down(
1410 *position,
1411 *cmd,
1412 *alt,
1413 *shift,
1414 *click_count,
1415 layout,
1416 paint,
1417 cx,
1418 ),
1419 Event::LeftMouseUp { position, .. } => self.mouse_up(*position, cx),
1420 Event::LeftMouseDragged { position } => {
1421 self.mouse_dragged(*position, layout, paint, cx)
1422 }
1423 Event::ScrollWheel {
1424 position,
1425 delta,
1426 precise,
1427 } => self.scroll(*position, *delta, *precise, layout, paint, cx),
1428 Event::KeyDown { input, .. } => self.key_down(input.as_deref(), cx),
1429 Event::MouseMoved { position, .. } => {
1430 // This will be handled more correctly once https://github.com/zed-industries/zed/issues/1218 is completed
1431 // Don't trigger hover popover if mouse is hovering over context menu
1432 if paint
1433 .context_menu_bounds
1434 .map_or(false, |context_menu_bounds| {
1435 context_menu_bounds.contains_point(*position)
1436 })
1437 {
1438 return false;
1439 }
1440
1441 if paint
1442 .hover_bounds
1443 .map_or(false, |hover_bounds| hover_bounds.contains_point(*position))
1444 {
1445 return false;
1446 }
1447
1448 let point = if paint.text_bounds.contains_point(*position) {
1449 let (point, overshoot) =
1450 paint.point_for_position(&self.snapshot(cx), layout, *position);
1451 if overshoot.is_zero() {
1452 Some(point)
1453 } else {
1454 None
1455 }
1456 } else {
1457 None
1458 };
1459
1460 cx.dispatch_action(HoverAt { point });
1461 true
1462 }
1463 _ => false,
1464 }
1465 }
1466
1467 fn debug(
1468 &self,
1469 bounds: RectF,
1470 _: &Self::LayoutState,
1471 _: &Self::PaintState,
1472 _: &gpui::DebugContext,
1473 ) -> json::Value {
1474 json!({
1475 "type": "BufferElement",
1476 "bounds": bounds.to_json()
1477 })
1478 }
1479}
1480
1481pub struct LayoutState {
1482 size: Vector2F,
1483 scroll_max: Vector2F,
1484 gutter_size: Vector2F,
1485 gutter_padding: f32,
1486 gutter_margin: f32,
1487 text_size: Vector2F,
1488 snapshot: EditorSnapshot,
1489 active_rows: BTreeMap<u32, bool>,
1490 highlighted_rows: Option<Range<u32>>,
1491 line_layouts: Vec<text_layout::Line>,
1492 line_number_layouts: Vec<Option<text_layout::Line>>,
1493 blocks: Vec<BlockLayout>,
1494 line_height: f32,
1495 em_width: f32,
1496 em_advance: f32,
1497 highlighted_ranges: Vec<(Range<DisplayPoint>, Color)>,
1498 selections: Vec<(ReplicaId, Vec<SelectionLayout>)>,
1499 context_menu: Option<(DisplayPoint, ElementBox)>,
1500 code_actions_indicator: Option<(u32, ElementBox)>,
1501 hover: Option<(DisplayPoint, ElementBox)>,
1502}
1503
1504struct BlockLayout {
1505 row: u32,
1506 element: ElementBox,
1507 style: BlockStyle,
1508}
1509
1510fn layout_line(
1511 row: u32,
1512 snapshot: &EditorSnapshot,
1513 style: &EditorStyle,
1514 layout_cache: &TextLayoutCache,
1515) -> text_layout::Line {
1516 let mut line = snapshot.line(row);
1517
1518 if line.len() > MAX_LINE_LEN {
1519 let mut len = MAX_LINE_LEN;
1520 while !line.is_char_boundary(len) {
1521 len -= 1;
1522 }
1523
1524 line.truncate(len);
1525 }
1526
1527 layout_cache.layout_str(
1528 &line,
1529 style.text.font_size,
1530 &[(
1531 snapshot.line_len(row) as usize,
1532 RunStyle {
1533 font_id: style.text.font_id,
1534 color: Color::black(),
1535 underline: Default::default(),
1536 },
1537 )],
1538 )
1539}
1540
1541pub struct PaintState {
1542 bounds: RectF,
1543 gutter_bounds: RectF,
1544 text_bounds: RectF,
1545 context_menu_bounds: Option<RectF>,
1546 hover_bounds: Option<RectF>,
1547}
1548
1549impl PaintState {
1550 /// Returns two display points. The first is the nearest valid
1551 /// position in the current buffer and the second is the distance to the
1552 /// nearest valid position if there was overshoot.
1553 fn point_for_position(
1554 &self,
1555 snapshot: &EditorSnapshot,
1556 layout: &LayoutState,
1557 position: Vector2F,
1558 ) -> (DisplayPoint, DisplayPoint) {
1559 let scroll_position = snapshot.scroll_position();
1560 let position = position - self.text_bounds.origin();
1561 let y = position.y().max(0.0).min(layout.size.y());
1562 let row = ((y / layout.line_height) + scroll_position.y()) as u32;
1563 let row_overshoot = row.saturating_sub(snapshot.max_point().row());
1564 let row = cmp::min(row, snapshot.max_point().row());
1565 let line = &layout.line_layouts[(row - scroll_position.y() as u32) as usize];
1566 let x = position.x() + (scroll_position.x() * layout.em_width);
1567
1568 let column = if x >= 0.0 {
1569 line.index_for_x(x)
1570 .map(|ix| ix as u32)
1571 .unwrap_or_else(|| snapshot.line_len(row))
1572 } else {
1573 0
1574 };
1575 let column_overshoot = (0f32.max(x - line.width()) / layout.em_advance) as u32;
1576
1577 (
1578 DisplayPoint::new(row, column),
1579 DisplayPoint::new(row_overshoot, column_overshoot),
1580 )
1581 }
1582}
1583
1584#[derive(Copy, Clone, PartialEq, Eq)]
1585pub enum CursorShape {
1586 Bar,
1587 Block,
1588 Underscore,
1589}
1590
1591impl Default for CursorShape {
1592 fn default() -> Self {
1593 CursorShape::Bar
1594 }
1595}
1596
1597struct Cursor {
1598 origin: Vector2F,
1599 block_width: f32,
1600 line_height: f32,
1601 color: Color,
1602 shape: CursorShape,
1603 block_text: Option<Line>,
1604}
1605
1606impl Cursor {
1607 fn paint(&self, cx: &mut PaintContext) {
1608 let bounds = match self.shape {
1609 CursorShape::Bar => RectF::new(self.origin, vec2f(2.0, self.line_height)),
1610 CursorShape::Block => {
1611 RectF::new(self.origin, vec2f(self.block_width, self.line_height))
1612 }
1613 CursorShape::Underscore => RectF::new(
1614 self.origin + Vector2F::new(0.0, self.line_height - 2.0),
1615 vec2f(self.block_width, 2.0),
1616 ),
1617 };
1618
1619 cx.scene.push_quad(Quad {
1620 bounds,
1621 background: Some(self.color),
1622 border: Border::new(0., Color::black()),
1623 corner_radius: 0.,
1624 });
1625
1626 if let Some(block_text) = &self.block_text {
1627 block_text.paint(self.origin, bounds, self.line_height, cx);
1628 }
1629 }
1630}
1631
1632#[derive(Debug)]
1633struct HighlightedRange {
1634 start_y: f32,
1635 line_height: f32,
1636 lines: Vec<HighlightedRangeLine>,
1637 color: Color,
1638 corner_radius: f32,
1639}
1640
1641#[derive(Debug)]
1642struct HighlightedRangeLine {
1643 start_x: f32,
1644 end_x: f32,
1645}
1646
1647impl HighlightedRange {
1648 fn paint(&self, bounds: RectF, scene: &mut Scene) {
1649 if self.lines.len() >= 2 && self.lines[0].start_x > self.lines[1].end_x {
1650 self.paint_lines(self.start_y, &self.lines[0..1], bounds, scene);
1651 self.paint_lines(
1652 self.start_y + self.line_height,
1653 &self.lines[1..],
1654 bounds,
1655 scene,
1656 );
1657 } else {
1658 self.paint_lines(self.start_y, &self.lines, bounds, scene);
1659 }
1660 }
1661
1662 fn paint_lines(
1663 &self,
1664 start_y: f32,
1665 lines: &[HighlightedRangeLine],
1666 bounds: RectF,
1667 scene: &mut Scene,
1668 ) {
1669 if lines.is_empty() {
1670 return;
1671 }
1672
1673 let mut path = PathBuilder::new();
1674 let first_line = lines.first().unwrap();
1675 let last_line = lines.last().unwrap();
1676
1677 let first_top_left = vec2f(first_line.start_x, start_y);
1678 let first_top_right = vec2f(first_line.end_x, start_y);
1679
1680 let curve_height = vec2f(0., self.corner_radius);
1681 let curve_width = |start_x: f32, end_x: f32| {
1682 let max = (end_x - start_x) / 2.;
1683 let width = if max < self.corner_radius {
1684 max
1685 } else {
1686 self.corner_radius
1687 };
1688
1689 vec2f(width, 0.)
1690 };
1691
1692 let top_curve_width = curve_width(first_line.start_x, first_line.end_x);
1693 path.reset(first_top_right - top_curve_width);
1694 path.curve_to(first_top_right + curve_height, first_top_right);
1695
1696 let mut iter = lines.iter().enumerate().peekable();
1697 while let Some((ix, line)) = iter.next() {
1698 let bottom_right = vec2f(line.end_x, start_y + (ix + 1) as f32 * self.line_height);
1699
1700 if let Some((_, next_line)) = iter.peek() {
1701 let next_top_right = vec2f(next_line.end_x, bottom_right.y());
1702
1703 match next_top_right.x().partial_cmp(&bottom_right.x()).unwrap() {
1704 Ordering::Equal => {
1705 path.line_to(bottom_right);
1706 }
1707 Ordering::Less => {
1708 let curve_width = curve_width(next_top_right.x(), bottom_right.x());
1709 path.line_to(bottom_right - curve_height);
1710 if self.corner_radius > 0. {
1711 path.curve_to(bottom_right - curve_width, bottom_right);
1712 }
1713 path.line_to(next_top_right + curve_width);
1714 if self.corner_radius > 0. {
1715 path.curve_to(next_top_right + curve_height, next_top_right);
1716 }
1717 }
1718 Ordering::Greater => {
1719 let curve_width = curve_width(bottom_right.x(), next_top_right.x());
1720 path.line_to(bottom_right - curve_height);
1721 if self.corner_radius > 0. {
1722 path.curve_to(bottom_right + curve_width, bottom_right);
1723 }
1724 path.line_to(next_top_right - curve_width);
1725 if self.corner_radius > 0. {
1726 path.curve_to(next_top_right + curve_height, next_top_right);
1727 }
1728 }
1729 }
1730 } else {
1731 let curve_width = curve_width(line.start_x, line.end_x);
1732 path.line_to(bottom_right - curve_height);
1733 if self.corner_radius > 0. {
1734 path.curve_to(bottom_right - curve_width, bottom_right);
1735 }
1736
1737 let bottom_left = vec2f(line.start_x, bottom_right.y());
1738 path.line_to(bottom_left + curve_width);
1739 if self.corner_radius > 0. {
1740 path.curve_to(bottom_left - curve_height, bottom_left);
1741 }
1742 }
1743 }
1744
1745 if first_line.start_x > last_line.start_x {
1746 let curve_width = curve_width(last_line.start_x, first_line.start_x);
1747 let second_top_left = vec2f(last_line.start_x, start_y + self.line_height);
1748 path.line_to(second_top_left + curve_height);
1749 if self.corner_radius > 0. {
1750 path.curve_to(second_top_left + curve_width, second_top_left);
1751 }
1752 let first_bottom_left = vec2f(first_line.start_x, second_top_left.y());
1753 path.line_to(first_bottom_left - curve_width);
1754 if self.corner_radius > 0. {
1755 path.curve_to(first_bottom_left - curve_height, first_bottom_left);
1756 }
1757 }
1758
1759 path.line_to(first_top_left + curve_height);
1760 if self.corner_radius > 0. {
1761 path.curve_to(first_top_left + top_curve_width, first_top_left);
1762 }
1763 path.line_to(first_top_right - top_curve_width);
1764
1765 scene.push_path(path.build(self.color, Some(bounds)));
1766 }
1767}
1768
1769fn scale_vertical_mouse_autoscroll_delta(delta: f32) -> f32 {
1770 delta.powf(1.5) / 100.0
1771}
1772
1773fn scale_horizontal_mouse_autoscroll_delta(delta: f32) -> f32 {
1774 delta.powf(1.2) / 300.0
1775}
1776
1777#[cfg(test)]
1778mod tests {
1779 use std::sync::Arc;
1780
1781 use super::*;
1782 use crate::{
1783 display_map::{BlockDisposition, BlockProperties},
1784 Editor, MultiBuffer,
1785 };
1786 use settings::Settings;
1787 use util::test::sample_text;
1788
1789 #[gpui::test]
1790 fn test_layout_line_numbers(cx: &mut gpui::MutableAppContext) {
1791 cx.set_global(Settings::test(cx));
1792 let buffer = MultiBuffer::build_simple(&sample_text(6, 6, 'a'), cx);
1793 let (window_id, editor) = cx.add_window(Default::default(), |cx| {
1794 Editor::new(EditorMode::Full, buffer, None, None, None, cx)
1795 });
1796 let element = EditorElement::new(
1797 editor.downgrade(),
1798 editor.read(cx).style(cx),
1799 CursorShape::Bar,
1800 );
1801
1802 let layouts = editor.update(cx, |editor, cx| {
1803 let snapshot = editor.snapshot(cx);
1804 let mut presenter = cx.build_presenter(window_id, 30.);
1805 let mut layout_cx = presenter.build_layout_context(Vector2F::zero(), false, cx);
1806 element.layout_line_numbers(0..6, &Default::default(), &snapshot, &mut layout_cx)
1807 });
1808 assert_eq!(layouts.len(), 6);
1809 }
1810
1811 #[gpui::test]
1812 fn test_layout_with_placeholder_text_and_blocks(cx: &mut gpui::MutableAppContext) {
1813 cx.set_global(Settings::test(cx));
1814 let buffer = MultiBuffer::build_simple("", cx);
1815 let (window_id, editor) = cx.add_window(Default::default(), |cx| {
1816 Editor::new(EditorMode::Full, buffer, None, None, None, cx)
1817 });
1818
1819 editor.update(cx, |editor, cx| {
1820 editor.set_placeholder_text("hello", cx);
1821 editor.insert_blocks(
1822 [BlockProperties {
1823 style: BlockStyle::Fixed,
1824 disposition: BlockDisposition::Above,
1825 height: 3,
1826 position: Anchor::min(),
1827 render: Arc::new(|_| Empty::new().boxed()),
1828 }],
1829 cx,
1830 );
1831
1832 // Blur the editor so that it displays placeholder text.
1833 cx.blur();
1834 });
1835
1836 let mut element = EditorElement::new(
1837 editor.downgrade(),
1838 editor.read(cx).style(cx),
1839 CursorShape::Bar,
1840 );
1841
1842 let mut scene = Scene::new(1.0);
1843 let mut presenter = cx.build_presenter(window_id, 30.);
1844 let mut layout_cx = presenter.build_layout_context(Vector2F::zero(), false, cx);
1845 let (size, mut state) = element.layout(
1846 SizeConstraint::new(vec2f(500., 500.), vec2f(500., 500.)),
1847 &mut layout_cx,
1848 );
1849
1850 assert_eq!(state.line_layouts.len(), 4);
1851 assert_eq!(
1852 state
1853 .line_number_layouts
1854 .iter()
1855 .map(Option::is_some)
1856 .collect::<Vec<_>>(),
1857 &[false, false, false, true]
1858 );
1859
1860 // Don't panic.
1861 let bounds = RectF::new(Default::default(), size);
1862 let mut paint_cx = presenter.build_paint_context(&mut scene, bounds.size(), cx);
1863 element.paint(bounds, bounds, &mut state, &mut paint_cx);
1864 }
1865}