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: &mut 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 if let Some((position, completions_list)) = layout.completions.as_mut() {
396 cx.scene.push_stacking_context(None);
397
398 let cursor_row_layout = &layout.line_layouts[(position.row() - start_row) as usize];
399 let x = cursor_row_layout.x_for_index(position.column() as usize) - scroll_left;
400 let y = (position.row() + 1) as f32 * layout.line_height - scroll_top;
401 let mut list_origin = content_origin + vec2f(x, y);
402 let list_height = completions_list.size().y();
403
404 if list_origin.y() + list_height > bounds.lower_left().y() {
405 list_origin.set_y(list_origin.y() - layout.line_height - list_height);
406 }
407
408 completions_list.paint(
409 list_origin,
410 RectF::from_points(Vector2F::zero(), vec2f(f32::MAX, f32::MAX)), // Let content bleed outside of editor
411 cx,
412 );
413
414 cx.scene.pop_stacking_context();
415 }
416
417 cx.scene.pop_layer();
418 }
419
420 fn paint_highlighted_range(
421 &self,
422 range: Range<DisplayPoint>,
423 start_row: u32,
424 end_row: u32,
425 color: Color,
426 corner_radius: f32,
427 line_end_overshoot: f32,
428 layout: &LayoutState,
429 content_origin: Vector2F,
430 scroll_top: f32,
431 scroll_left: f32,
432 bounds: RectF,
433 cx: &mut PaintContext,
434 ) {
435 if range.start != range.end {
436 let row_range = if range.end.column() == 0 {
437 cmp::max(range.start.row(), start_row)..cmp::min(range.end.row(), end_row)
438 } else {
439 cmp::max(range.start.row(), start_row)..cmp::min(range.end.row() + 1, end_row)
440 };
441
442 let highlighted_range = HighlightedRange {
443 color,
444 line_height: layout.line_height,
445 corner_radius,
446 start_y: content_origin.y() + row_range.start as f32 * layout.line_height
447 - scroll_top,
448 lines: row_range
449 .into_iter()
450 .map(|row| {
451 let line_layout = &layout.line_layouts[(row - start_row) as usize];
452 HighlightedRangeLine {
453 start_x: if row == range.start.row() {
454 content_origin.x()
455 + line_layout.x_for_index(range.start.column() as usize)
456 - scroll_left
457 } else {
458 content_origin.x() - scroll_left
459 },
460 end_x: if row == range.end.row() {
461 content_origin.x()
462 + line_layout.x_for_index(range.end.column() as usize)
463 - scroll_left
464 } else {
465 content_origin.x() + line_layout.width() + line_end_overshoot
466 - scroll_left
467 },
468 }
469 })
470 .collect(),
471 };
472
473 highlighted_range.paint(bounds, cx.scene);
474 }
475 }
476
477 fn paint_blocks(
478 &mut self,
479 bounds: RectF,
480 visible_bounds: RectF,
481 layout: &mut LayoutState,
482 cx: &mut PaintContext,
483 ) {
484 let scroll_position = layout.snapshot.scroll_position();
485 let scroll_left = scroll_position.x() * layout.em_width;
486 let scroll_top = scroll_position.y() * layout.line_height;
487
488 for (row, element) in &mut layout.blocks {
489 let origin = bounds.origin()
490 + vec2f(-scroll_left, *row as f32 * layout.line_height - scroll_top);
491 element.paint(origin, visible_bounds, cx);
492 }
493 }
494
495 fn max_line_number_width(&self, snapshot: &EditorSnapshot, cx: &LayoutContext) -> f32 {
496 let digit_count = (snapshot.max_buffer_row() as f32).log10().floor() as usize + 1;
497 let style = &self.settings.style;
498
499 cx.text_layout_cache
500 .layout_str(
501 "1".repeat(digit_count).as_str(),
502 style.text.font_size,
503 &[(
504 digit_count,
505 RunStyle {
506 font_id: style.text.font_id,
507 color: Color::black(),
508 underline: None,
509 },
510 )],
511 )
512 .width()
513 }
514
515 fn layout_line_numbers(
516 &self,
517 rows: Range<u32>,
518 active_rows: &BTreeMap<u32, bool>,
519 snapshot: &EditorSnapshot,
520 cx: &LayoutContext,
521 ) -> Vec<Option<text_layout::Line>> {
522 let style = &self.settings.style;
523 let include_line_numbers = snapshot.mode == EditorMode::Full;
524 let mut line_number_layouts = Vec::with_capacity(rows.len());
525 let mut line_number = String::new();
526 for (ix, row) in snapshot
527 .buffer_rows(rows.start)
528 .take((rows.end - rows.start) as usize)
529 .enumerate()
530 {
531 let display_row = rows.start + ix as u32;
532 let color = if active_rows.contains_key(&display_row) {
533 style.line_number_active
534 } else {
535 style.line_number
536 };
537 if let Some(buffer_row) = row {
538 if include_line_numbers {
539 line_number.clear();
540 write!(&mut line_number, "{}", buffer_row + 1).unwrap();
541 line_number_layouts.push(Some(cx.text_layout_cache.layout_str(
542 &line_number,
543 style.text.font_size,
544 &[(
545 line_number.len(),
546 RunStyle {
547 font_id: style.text.font_id,
548 color,
549 underline: None,
550 },
551 )],
552 )));
553 }
554 } else {
555 line_number_layouts.push(None);
556 }
557 }
558
559 line_number_layouts
560 }
561
562 fn layout_lines(
563 &mut self,
564 mut rows: Range<u32>,
565 snapshot: &mut EditorSnapshot,
566 cx: &LayoutContext,
567 ) -> Vec<text_layout::Line> {
568 rows.end = cmp::min(rows.end, snapshot.max_point().row() + 1);
569 if rows.start >= rows.end {
570 return Vec::new();
571 }
572
573 // When the editor is empty and unfocused, then show the placeholder.
574 if snapshot.is_empty() && !snapshot.is_focused() {
575 let placeholder_style = self.settings.style.placeholder_text();
576 let placeholder_text = snapshot.placeholder_text();
577 let placeholder_lines = placeholder_text
578 .as_ref()
579 .map_or("", AsRef::as_ref)
580 .split('\n')
581 .skip(rows.start as usize)
582 .take(rows.len());
583 return placeholder_lines
584 .map(|line| {
585 cx.text_layout_cache.layout_str(
586 line,
587 placeholder_style.font_size,
588 &[(
589 line.len(),
590 RunStyle {
591 font_id: placeholder_style.font_id,
592 color: placeholder_style.color,
593 underline: None,
594 },
595 )],
596 )
597 })
598 .collect();
599 } else {
600 let style = &self.settings.style;
601 let chunks = snapshot
602 .chunks(rows.clone(), Some(&style.syntax))
603 .map(|chunk| {
604 let highlight = if let Some(severity) = chunk.diagnostic {
605 let diagnostic_style = super::diagnostic_style(severity, true, style);
606 let underline = Some(Underline {
607 color: diagnostic_style.message.text.color,
608 thickness: 1.0.into(),
609 squiggly: true,
610 });
611 if let Some(mut highlight) = chunk.highlight_style {
612 highlight.underline = underline;
613 Some(highlight)
614 } else {
615 Some(HighlightStyle {
616 underline,
617 color: style.text.color,
618 font_properties: style.text.font_properties,
619 })
620 }
621 } else {
622 chunk.highlight_style
623 };
624 (chunk.text, highlight)
625 });
626 layout_highlighted_chunks(
627 chunks,
628 &style.text,
629 &cx.text_layout_cache,
630 &cx.font_cache,
631 MAX_LINE_LEN,
632 rows.len() as usize,
633 )
634 }
635 }
636
637 fn layout_blocks(
638 &mut self,
639 rows: Range<u32>,
640 snapshot: &EditorSnapshot,
641 width: f32,
642 gutter_padding: f32,
643 gutter_width: f32,
644 em_width: f32,
645 text_x: f32,
646 line_height: f32,
647 style: &EditorStyle,
648 line_layouts: &[text_layout::Line],
649 cx: &mut LayoutContext,
650 ) -> Vec<(u32, ElementBox)> {
651 snapshot
652 .blocks_in_range(rows.clone())
653 .map(|(start_row, block)| {
654 let anchor_row = block
655 .position()
656 .to_point(&snapshot.buffer_snapshot)
657 .to_display_point(snapshot)
658 .row();
659
660 let anchor_x = text_x
661 + if rows.contains(&anchor_row) {
662 line_layouts[(anchor_row - rows.start) as usize]
663 .x_for_index(block.column() as usize)
664 } else {
665 layout_line(anchor_row, snapshot, style, cx.text_layout_cache)
666 .x_for_index(block.column() as usize)
667 };
668
669 let mut element = block.render(&BlockContext {
670 cx,
671 anchor_x,
672 gutter_padding,
673 line_height,
674 scroll_x: snapshot.scroll_position.x(),
675 gutter_width,
676 em_width,
677 });
678 element.layout(
679 SizeConstraint {
680 min: Vector2F::zero(),
681 max: vec2f(width, block.height() as f32 * line_height),
682 },
683 cx,
684 );
685 (start_row, element)
686 })
687 .collect()
688 }
689}
690
691impl Element for EditorElement {
692 type LayoutState = LayoutState;
693 type PaintState = PaintState;
694
695 fn layout(
696 &mut self,
697 constraint: SizeConstraint,
698 cx: &mut LayoutContext,
699 ) -> (Vector2F, Self::LayoutState) {
700 let mut size = constraint.max;
701 if size.x().is_infinite() {
702 unimplemented!("we don't yet handle an infinite width constraint on buffer elements");
703 }
704
705 let snapshot = self.snapshot(cx.app);
706 let style = self.settings.style.clone();
707 let line_height = style.text.line_height(cx.font_cache);
708
709 let gutter_padding;
710 let gutter_width;
711 if snapshot.mode == EditorMode::Full {
712 gutter_padding = style.text.em_width(cx.font_cache) * style.gutter_padding_factor;
713 gutter_width = self.max_line_number_width(&snapshot, cx) + gutter_padding * 2.0;
714 } else {
715 gutter_padding = 0.0;
716 gutter_width = 0.0
717 };
718
719 let text_width = size.x() - gutter_width;
720 let text_offset = vec2f(-style.text.descent(cx.font_cache), 0.);
721 let em_width = style.text.em_width(cx.font_cache);
722 let em_advance = style.text.em_advance(cx.font_cache);
723 let overscroll = vec2f(em_width, 0.);
724 let wrap_width = match self.settings.soft_wrap {
725 SoftWrap::None => None,
726 SoftWrap::EditorWidth => Some(text_width - text_offset.x() - overscroll.x() - em_width),
727 SoftWrap::Column(column) => Some(column as f32 * em_advance),
728 };
729 let snapshot = self.update_view(cx.app, |view, cx| {
730 if view.set_wrap_width(wrap_width, cx) {
731 view.snapshot(cx)
732 } else {
733 snapshot
734 }
735 });
736
737 let scroll_height = (snapshot.max_point().row() + 1) as f32 * line_height;
738 if let EditorMode::AutoHeight { max_lines } = snapshot.mode {
739 size.set_y(
740 scroll_height
741 .min(constraint.max_along(Axis::Vertical))
742 .max(constraint.min_along(Axis::Vertical))
743 .min(line_height * max_lines as f32),
744 )
745 } else if size.y().is_infinite() {
746 size.set_y(scroll_height);
747 }
748 let gutter_size = vec2f(gutter_width, size.y());
749 let text_size = vec2f(text_width, size.y());
750
751 let (autoscroll_horizontally, mut snapshot) = self.update_view(cx.app, |view, cx| {
752 let autoscroll_horizontally = view.autoscroll_vertically(size.y(), line_height, cx);
753 let snapshot = view.snapshot(cx);
754 (autoscroll_horizontally, snapshot)
755 });
756
757 let scroll_position = snapshot.scroll_position();
758 let start_row = scroll_position.y() as u32;
759 let scroll_top = scroll_position.y() * line_height;
760 let end_row = ((scroll_top + size.y()) / line_height).ceil() as u32 + 1; // Add 1 to ensure selections bleed off screen
761
762 let start_anchor = if start_row == 0 {
763 Anchor::min()
764 } else {
765 snapshot
766 .buffer_snapshot
767 .anchor_before(DisplayPoint::new(start_row, 0).to_offset(&snapshot, Bias::Left))
768 };
769 let end_anchor = if end_row > snapshot.max_point().row() {
770 Anchor::max()
771 } else {
772 snapshot
773 .buffer_snapshot
774 .anchor_before(DisplayPoint::new(end_row, 0).to_offset(&snapshot, Bias::Right))
775 };
776
777 let mut selections = HashMap::default();
778 let mut active_rows = BTreeMap::new();
779 let mut highlighted_rows = None;
780 let mut highlighted_ranges = Vec::new();
781 self.update_view(cx.app, |view, cx| {
782 let display_map = view.display_map.update(cx, |map, cx| map.snapshot(cx));
783
784 highlighted_rows = view.highlighted_rows();
785 highlighted_ranges = view.highlighted_ranges_in_range(
786 start_anchor.clone()..end_anchor.clone(),
787 &display_map,
788 );
789
790 let local_selections = view
791 .local_selections_in_range(start_anchor.clone()..end_anchor.clone(), &display_map);
792 for selection in &local_selections {
793 let is_empty = selection.start == selection.end;
794 let selection_start = snapshot.prev_line_boundary(selection.start).1;
795 let selection_end = snapshot.next_line_boundary(selection.end).1;
796 for row in cmp::max(selection_start.row(), start_row)
797 ..=cmp::min(selection_end.row(), end_row)
798 {
799 let contains_non_empty_selection = active_rows.entry(row).or_insert(!is_empty);
800 *contains_non_empty_selection |= !is_empty;
801 }
802 }
803 selections.insert(
804 view.replica_id(cx),
805 local_selections
806 .into_iter()
807 .map(|selection| crate::Selection {
808 id: selection.id,
809 goal: selection.goal,
810 reversed: selection.reversed,
811 start: selection.start.to_display_point(&display_map),
812 end: selection.end.to_display_point(&display_map),
813 })
814 .collect(),
815 );
816
817 for (replica_id, selection) in display_map
818 .buffer_snapshot
819 .remote_selections_in_range(&(start_anchor..end_anchor))
820 {
821 selections
822 .entry(replica_id)
823 .or_insert(Vec::new())
824 .push(crate::Selection {
825 id: selection.id,
826 goal: selection.goal,
827 reversed: selection.reversed,
828 start: selection.start.to_display_point(&display_map),
829 end: selection.end.to_display_point(&display_map),
830 });
831 }
832 });
833
834 let line_number_layouts =
835 self.layout_line_numbers(start_row..end_row, &active_rows, &snapshot, cx);
836
837 let mut max_visible_line_width = 0.0;
838 let line_layouts = self.layout_lines(start_row..end_row, &mut snapshot, cx);
839 for line in &line_layouts {
840 if line.width() > max_visible_line_width {
841 max_visible_line_width = line.width();
842 }
843 }
844
845 let style = self.settings.style.clone();
846 let longest_line_width = layout_line(
847 snapshot.longest_row(),
848 &snapshot,
849 &style,
850 cx.text_layout_cache,
851 )
852 .width();
853 let scroll_width = longest_line_width.max(max_visible_line_width) + overscroll.x();
854 let em_width = style.text.em_width(cx.font_cache);
855 let max_row = snapshot.max_point().row();
856 let scroll_max = vec2f(
857 ((scroll_width - text_size.x()) / em_width).max(0.0),
858 max_row.saturating_sub(1) as f32,
859 );
860
861 let mut completions = None;
862 self.update_view(cx.app, |view, cx| {
863 let clamped = view.clamp_scroll_left(scroll_max.x());
864 let autoscrolled;
865 if autoscroll_horizontally {
866 autoscrolled = view.autoscroll_horizontally(
867 start_row,
868 text_size.x(),
869 scroll_width,
870 em_width,
871 &line_layouts,
872 cx,
873 );
874 } else {
875 autoscrolled = false;
876 }
877
878 if clamped || autoscrolled {
879 snapshot = view.snapshot(cx);
880 }
881
882 if view.has_completions() {
883 let newest_selection_head = view
884 .newest_selection::<usize>(&snapshot.buffer_snapshot)
885 .head()
886 .to_display_point(&snapshot);
887
888 if (start_row..end_row).contains(&newest_selection_head.row()) {
889 let list = view.render_completions(cx).unwrap();
890 completions = Some((newest_selection_head, list));
891 }
892 }
893 });
894
895 if let Some((_, completions_list)) = completions.as_mut() {
896 completions_list.layout(
897 SizeConstraint {
898 min: Vector2F::zero(),
899 max: vec2f(800., (12. * line_height).min((size.y() - line_height) / 2.)),
900 },
901 cx,
902 );
903 }
904
905 let blocks = self.layout_blocks(
906 start_row..end_row,
907 &snapshot,
908 size.x().max(scroll_width + gutter_width),
909 gutter_padding,
910 gutter_width,
911 em_width,
912 gutter_width + text_offset.x(),
913 line_height,
914 &style,
915 &line_layouts,
916 cx,
917 );
918
919 (
920 size,
921 LayoutState {
922 size,
923 scroll_max,
924 gutter_size,
925 gutter_padding,
926 text_size,
927 text_offset,
928 snapshot,
929 active_rows,
930 highlighted_rows,
931 highlighted_ranges,
932 line_layouts,
933 line_number_layouts,
934 blocks,
935 line_height,
936 em_width,
937 em_advance,
938 selections,
939 completions,
940 },
941 )
942 }
943
944 fn paint(
945 &mut self,
946 bounds: RectF,
947 visible_bounds: RectF,
948 layout: &mut Self::LayoutState,
949 cx: &mut PaintContext,
950 ) -> Self::PaintState {
951 cx.scene.push_layer(Some(bounds));
952
953 let gutter_bounds = RectF::new(bounds.origin(), layout.gutter_size);
954 let text_bounds = RectF::new(
955 bounds.origin() + vec2f(layout.gutter_size.x(), 0.0),
956 layout.text_size,
957 );
958
959 self.paint_background(gutter_bounds, text_bounds, layout, cx);
960 if layout.gutter_size.x() > 0. {
961 self.paint_gutter(gutter_bounds, visible_bounds, layout, cx);
962 }
963 self.paint_text(text_bounds, visible_bounds, layout, cx);
964
965 if !layout.blocks.is_empty() {
966 cx.scene.push_layer(Some(bounds));
967 self.paint_blocks(bounds, visible_bounds, layout, cx);
968 cx.scene.pop_layer();
969 }
970
971 cx.scene.pop_layer();
972
973 PaintState {
974 bounds,
975 gutter_bounds,
976 text_bounds,
977 }
978 }
979
980 fn dispatch_event(
981 &mut self,
982 event: &Event,
983 _: RectF,
984 layout: &mut LayoutState,
985 paint: &mut PaintState,
986 cx: &mut EventContext,
987 ) -> bool {
988 if let Some((_, completion_list)) = &mut layout.completions {
989 if completion_list.dispatch_event(event, cx) {
990 return true;
991 }
992 }
993
994 match event {
995 Event::LeftMouseDown {
996 position,
997 alt,
998 shift,
999 click_count,
1000 ..
1001 } => self.mouse_down(*position, *alt, *shift, *click_count, layout, paint, cx),
1002 Event::LeftMouseUp { position } => self.mouse_up(*position, cx),
1003 Event::LeftMouseDragged { position } => {
1004 self.mouse_dragged(*position, layout, paint, cx)
1005 }
1006 Event::ScrollWheel {
1007 position,
1008 delta,
1009 precise,
1010 } => self.scroll(*position, *delta, *precise, layout, paint, cx),
1011 Event::KeyDown {
1012 chars, keystroke, ..
1013 } => self.key_down(chars, keystroke, cx),
1014 _ => false,
1015 }
1016 }
1017
1018 fn debug(
1019 &self,
1020 bounds: RectF,
1021 _: &Self::LayoutState,
1022 _: &Self::PaintState,
1023 _: &gpui::DebugContext,
1024 ) -> json::Value {
1025 json!({
1026 "type": "BufferElement",
1027 "bounds": bounds.to_json()
1028 })
1029 }
1030}
1031
1032pub struct LayoutState {
1033 size: Vector2F,
1034 scroll_max: Vector2F,
1035 gutter_size: Vector2F,
1036 gutter_padding: f32,
1037 text_size: Vector2F,
1038 snapshot: EditorSnapshot,
1039 active_rows: BTreeMap<u32, bool>,
1040 highlighted_rows: Option<Range<u32>>,
1041 line_layouts: Vec<text_layout::Line>,
1042 line_number_layouts: Vec<Option<text_layout::Line>>,
1043 blocks: Vec<(u32, ElementBox)>,
1044 line_height: f32,
1045 em_width: f32,
1046 em_advance: f32,
1047 highlighted_ranges: Vec<(Range<DisplayPoint>, Color)>,
1048 selections: HashMap<ReplicaId, Vec<text::Selection<DisplayPoint>>>,
1049 text_offset: Vector2F,
1050 completions: Option<(DisplayPoint, ElementBox)>,
1051}
1052
1053fn layout_line(
1054 row: u32,
1055 snapshot: &EditorSnapshot,
1056 style: &EditorStyle,
1057 layout_cache: &TextLayoutCache,
1058) -> text_layout::Line {
1059 let mut line = snapshot.line(row);
1060
1061 if line.len() > MAX_LINE_LEN {
1062 let mut len = MAX_LINE_LEN;
1063 while !line.is_char_boundary(len) {
1064 len -= 1;
1065 }
1066 line.truncate(len);
1067 }
1068
1069 layout_cache.layout_str(
1070 &line,
1071 style.text.font_size,
1072 &[(
1073 snapshot.line_len(row) as usize,
1074 RunStyle {
1075 font_id: style.text.font_id,
1076 color: Color::black(),
1077 underline: None,
1078 },
1079 )],
1080 )
1081}
1082
1083pub struct PaintState {
1084 bounds: RectF,
1085 gutter_bounds: RectF,
1086 text_bounds: RectF,
1087}
1088
1089impl PaintState {
1090 fn point_for_position(
1091 &self,
1092 snapshot: &EditorSnapshot,
1093 layout: &LayoutState,
1094 position: Vector2F,
1095 ) -> (DisplayPoint, u32) {
1096 let scroll_position = snapshot.scroll_position();
1097 let position = position - self.text_bounds.origin();
1098 let y = position.y().max(0.0).min(layout.size.y());
1099 let row = ((y / layout.line_height) + scroll_position.y()) as u32;
1100 let row = cmp::min(row, snapshot.max_point().row());
1101 let line = &layout.line_layouts[(row - scroll_position.y() as u32) as usize];
1102 let x = position.x() + (scroll_position.x() * layout.em_width);
1103
1104 let column = if x >= 0.0 {
1105 line.index_for_x(x)
1106 .map(|ix| ix as u32)
1107 .unwrap_or_else(|| snapshot.line_len(row))
1108 } else {
1109 0
1110 };
1111 let overshoot = (0f32.max(x - line.width()) / layout.em_advance) as u32;
1112
1113 (DisplayPoint::new(row, column), overshoot)
1114 }
1115}
1116
1117struct Cursor {
1118 origin: Vector2F,
1119 line_height: f32,
1120 color: Color,
1121}
1122
1123impl Cursor {
1124 fn paint(&self, cx: &mut PaintContext) {
1125 cx.scene.push_quad(Quad {
1126 bounds: RectF::new(self.origin, vec2f(2.0, self.line_height)),
1127 background: Some(self.color),
1128 border: Border::new(0., Color::black()),
1129 corner_radius: 0.,
1130 });
1131 }
1132}
1133
1134#[derive(Debug)]
1135struct HighlightedRange {
1136 start_y: f32,
1137 line_height: f32,
1138 lines: Vec<HighlightedRangeLine>,
1139 color: Color,
1140 corner_radius: f32,
1141}
1142
1143#[derive(Debug)]
1144struct HighlightedRangeLine {
1145 start_x: f32,
1146 end_x: f32,
1147}
1148
1149impl HighlightedRange {
1150 fn paint(&self, bounds: RectF, scene: &mut Scene) {
1151 if self.lines.len() >= 2 && self.lines[0].start_x > self.lines[1].end_x {
1152 self.paint_lines(self.start_y, &self.lines[0..1], bounds, scene);
1153 self.paint_lines(
1154 self.start_y + self.line_height,
1155 &self.lines[1..],
1156 bounds,
1157 scene,
1158 );
1159 } else {
1160 self.paint_lines(self.start_y, &self.lines, bounds, scene);
1161 }
1162 }
1163
1164 fn paint_lines(
1165 &self,
1166 start_y: f32,
1167 lines: &[HighlightedRangeLine],
1168 bounds: RectF,
1169 scene: &mut Scene,
1170 ) {
1171 if lines.is_empty() {
1172 return;
1173 }
1174
1175 let mut path = PathBuilder::new();
1176 let first_line = lines.first().unwrap();
1177 let last_line = lines.last().unwrap();
1178
1179 let first_top_left = vec2f(first_line.start_x, start_y);
1180 let first_top_right = vec2f(first_line.end_x, start_y);
1181
1182 let curve_height = vec2f(0., self.corner_radius);
1183 let curve_width = |start_x: f32, end_x: f32| {
1184 let max = (end_x - start_x) / 2.;
1185 let width = if max < self.corner_radius {
1186 max
1187 } else {
1188 self.corner_radius
1189 };
1190
1191 vec2f(width, 0.)
1192 };
1193
1194 let top_curve_width = curve_width(first_line.start_x, first_line.end_x);
1195 path.reset(first_top_right - top_curve_width);
1196 path.curve_to(first_top_right + curve_height, first_top_right);
1197
1198 let mut iter = lines.iter().enumerate().peekable();
1199 while let Some((ix, line)) = iter.next() {
1200 let bottom_right = vec2f(line.end_x, start_y + (ix + 1) as f32 * self.line_height);
1201
1202 if let Some((_, next_line)) = iter.peek() {
1203 let next_top_right = vec2f(next_line.end_x, bottom_right.y());
1204
1205 match next_top_right.x().partial_cmp(&bottom_right.x()).unwrap() {
1206 Ordering::Equal => {
1207 path.line_to(bottom_right);
1208 }
1209 Ordering::Less => {
1210 let curve_width = curve_width(next_top_right.x(), bottom_right.x());
1211 path.line_to(bottom_right - curve_height);
1212 if self.corner_radius > 0. {
1213 path.curve_to(bottom_right - curve_width, bottom_right);
1214 }
1215 path.line_to(next_top_right + curve_width);
1216 if self.corner_radius > 0. {
1217 path.curve_to(next_top_right + curve_height, next_top_right);
1218 }
1219 }
1220 Ordering::Greater => {
1221 let curve_width = curve_width(bottom_right.x(), next_top_right.x());
1222 path.line_to(bottom_right - curve_height);
1223 if self.corner_radius > 0. {
1224 path.curve_to(bottom_right + curve_width, bottom_right);
1225 }
1226 path.line_to(next_top_right - curve_width);
1227 if self.corner_radius > 0. {
1228 path.curve_to(next_top_right + curve_height, next_top_right);
1229 }
1230 }
1231 }
1232 } else {
1233 let curve_width = curve_width(line.start_x, line.end_x);
1234 path.line_to(bottom_right - curve_height);
1235 if self.corner_radius > 0. {
1236 path.curve_to(bottom_right - curve_width, bottom_right);
1237 }
1238
1239 let bottom_left = vec2f(line.start_x, bottom_right.y());
1240 path.line_to(bottom_left + curve_width);
1241 if self.corner_radius > 0. {
1242 path.curve_to(bottom_left - curve_height, bottom_left);
1243 }
1244 }
1245 }
1246
1247 if first_line.start_x > last_line.start_x {
1248 let curve_width = curve_width(last_line.start_x, first_line.start_x);
1249 let second_top_left = vec2f(last_line.start_x, start_y + self.line_height);
1250 path.line_to(second_top_left + curve_height);
1251 if self.corner_radius > 0. {
1252 path.curve_to(second_top_left + curve_width, second_top_left);
1253 }
1254 let first_bottom_left = vec2f(first_line.start_x, second_top_left.y());
1255 path.line_to(first_bottom_left - curve_width);
1256 if self.corner_radius > 0. {
1257 path.curve_to(first_bottom_left - curve_height, first_bottom_left);
1258 }
1259 }
1260
1261 path.line_to(first_top_left + curve_height);
1262 if self.corner_radius > 0. {
1263 path.curve_to(first_top_left + top_curve_width, first_top_left);
1264 }
1265 path.line_to(first_top_right - top_curve_width);
1266
1267 scene.push_path(path.build(self.color, Some(bounds)));
1268 }
1269}
1270
1271fn scale_vertical_mouse_autoscroll_delta(delta: f32) -> f32 {
1272 delta.powf(1.5) / 100.0
1273}
1274
1275fn scale_horizontal_mouse_autoscroll_delta(delta: f32) -> f32 {
1276 delta.powf(1.2) / 300.0
1277}
1278
1279#[cfg(test)]
1280mod tests {
1281 use super::*;
1282 use crate::{Editor, EditorSettings, MultiBuffer};
1283 use std::sync::Arc;
1284 use util::test::sample_text;
1285
1286 #[gpui::test]
1287 fn test_layout_line_numbers(cx: &mut gpui::MutableAppContext) {
1288 let settings = EditorSettings::test(cx);
1289 let buffer = MultiBuffer::build_simple(&sample_text(6, 6, 'a'), cx);
1290 let (window_id, editor) = cx.add_window(Default::default(), |cx| {
1291 Editor::for_buffer(
1292 buffer,
1293 {
1294 let settings = settings.clone();
1295 Arc::new(move |_| settings.clone())
1296 },
1297 cx,
1298 )
1299 });
1300 let element = EditorElement::new(editor.downgrade(), settings);
1301
1302 let layouts = editor.update(cx, |editor, cx| {
1303 let snapshot = editor.snapshot(cx);
1304 let mut presenter = cx.build_presenter(window_id, 30.);
1305 let mut layout_cx = presenter.build_layout_context(false, cx);
1306 element.layout_line_numbers(0..6, &Default::default(), &snapshot, &mut layout_cx)
1307 });
1308 assert_eq!(layouts.len(), 6);
1309 }
1310}