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