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