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