1use super::{
2 display_map::{BlockContext, ToDisplayPoint},
3 Anchor, DisplayPoint, Editor, EditorMode, EditorSnapshot, Scroll, Select, SelectPhase,
4 SoftWrap, ToPoint, MAX_LINE_LEN,
5};
6use crate::{
7 display_map::{BlockStyle, DisplaySnapshot, TransformBlock},
8 hover_popover::HoverAt,
9 link_go_to_definition::{CmdChanged, GoToFetchedDefinition, UpdateGoToDefinitionLink},
10 mouse_context_menu::DeployMouseContextMenu,
11 EditorStyle,
12};
13use clock::ReplicaId;
14use collections::{BTreeMap, HashMap};
15use gpui::{
16 color::Color,
17 elements::*,
18 fonts::{HighlightStyle, Underline},
19 geometry::{
20 rect::RectF,
21 vector::{vec2f, Vector2F},
22 PathBuilder,
23 },
24 json::{self, ToJson},
25 platform::CursorStyle,
26 text_layout::{self, Line, RunStyle, TextLayoutCache},
27 AppContext, Axis, Border, CursorRegion, Element, ElementBox, Event, EventContext,
28 LayoutContext, ModifiersChangedEvent, MouseButton, MouseButtonEvent, MouseMovedEvent,
29 MutableAppContext, PaintContext, Quad, Scene, ScrollWheelEvent, SizeConstraint, ViewContext,
30 WeakViewHandle,
31};
32use json::json;
33use language::{Bias, DiagnosticSeverity, OffsetUtf16, Selection};
34use project::ProjectPath;
35use settings::Settings;
36use smallvec::SmallVec;
37use std::{
38 cmp::{self, Ordering},
39 fmt::Write,
40 iter,
41 ops::Range,
42};
43
44struct SelectionLayout {
45 head: DisplayPoint,
46 range: Range<DisplayPoint>,
47}
48
49impl SelectionLayout {
50 fn new<T: ToPoint + ToDisplayPoint + Clone>(
51 selection: Selection<T>,
52 line_mode: bool,
53 map: &DisplaySnapshot,
54 ) -> Self {
55 if line_mode {
56 let selection = selection.map(|p| p.to_point(&map.buffer_snapshot));
57 let point_range = map.expand_to_line(selection.range());
58 Self {
59 head: selection.head().to_display_point(map),
60 range: point_range.start.to_display_point(map)
61 ..point_range.end.to_display_point(map),
62 }
63 } else {
64 let selection = selection.map(|p| p.to_display_point(map));
65 Self {
66 head: selection.head(),
67 range: selection.range(),
68 }
69 }
70 }
71}
72
73pub struct EditorElement {
74 view: WeakViewHandle<Editor>,
75 style: EditorStyle,
76 cursor_shape: CursorShape,
77}
78
79impl EditorElement {
80 pub fn new(
81 view: WeakViewHandle<Editor>,
82 style: EditorStyle,
83 cursor_shape: CursorShape,
84 ) -> Self {
85 Self {
86 view,
87 style,
88 cursor_shape,
89 }
90 }
91
92 fn view<'a>(&self, cx: &'a AppContext) -> &'a Editor {
93 self.view.upgrade(cx).unwrap().read(cx)
94 }
95
96 fn update_view<F, T>(&self, cx: &mut MutableAppContext, f: F) -> T
97 where
98 F: FnOnce(&mut Editor, &mut ViewContext<Editor>) -> T,
99 {
100 self.view.upgrade(cx).unwrap().update(cx, f)
101 }
102
103 fn snapshot(&self, cx: &mut MutableAppContext) -> EditorSnapshot {
104 self.update_view(cx, |view, cx| view.snapshot(cx))
105 }
106
107 fn mouse_down(
108 &self,
109 position: Vector2F,
110 cmd: bool,
111 alt: bool,
112 shift: bool,
113 mut click_count: usize,
114 layout: &mut LayoutState,
115 paint: &mut PaintState,
116 cx: &mut EventContext,
117 ) -> bool {
118 if cmd && paint.text_bounds.contains_point(position) {
119 let (point, overshoot) = paint.point_for_position(&self.snapshot(cx), layout, position);
120 if overshoot.is_zero() {
121 cx.dispatch_action(GoToFetchedDefinition { point });
122 return true;
123 }
124 }
125
126 if paint.gutter_bounds.contains_point(position) {
127 click_count = 3; // Simulate triple-click when clicking the gutter to select lines
128 } else if !paint.text_bounds.contains_point(position) {
129 return false;
130 }
131
132 let snapshot = self.snapshot(cx.app);
133 let (position, overshoot) = paint.point_for_position(&snapshot, layout, position);
134
135 if shift && alt {
136 cx.dispatch_action(Select(SelectPhase::BeginColumnar {
137 position,
138 overshoot: overshoot.column(),
139 }));
140 } else if shift {
141 cx.dispatch_action(Select(SelectPhase::Extend {
142 position,
143 click_count,
144 }));
145 } else {
146 cx.dispatch_action(Select(SelectPhase::Begin {
147 position,
148 add: alt,
149 click_count,
150 }));
151 }
152
153 true
154 }
155
156 fn mouse_right_down(
157 &self,
158 position: Vector2F,
159 layout: &mut LayoutState,
160 paint: &mut PaintState,
161 cx: &mut EventContext,
162 ) -> bool {
163 if !paint.text_bounds.contains_point(position) {
164 return false;
165 }
166
167 let snapshot = self.snapshot(cx.app);
168 let (point, _) = paint.point_for_position(&snapshot, layout, position);
169
170 cx.dispatch_action(DeployMouseContextMenu { position, point });
171 true
172 }
173
174 fn mouse_up(&self, _position: Vector2F, cx: &mut EventContext) -> bool {
175 if self.view(cx.app.as_ref()).is_selecting() {
176 cx.dispatch_action(Select(SelectPhase::End));
177 true
178 } else {
179 false
180 }
181 }
182
183 fn mouse_dragged(
184 &self,
185 position: Vector2F,
186 layout: &mut LayoutState,
187 paint: &mut PaintState,
188 cx: &mut EventContext,
189 ) -> bool {
190 let view = self.view(cx.app.as_ref());
191
192 if view.is_selecting() {
193 let rect = paint.text_bounds;
194 let mut scroll_delta = Vector2F::zero();
195
196 let vertical_margin = layout.line_height.min(rect.height() / 3.0);
197 let top = rect.origin_y() + vertical_margin;
198 let bottom = rect.lower_left().y() - vertical_margin;
199 if position.y() < top {
200 scroll_delta.set_y(-scale_vertical_mouse_autoscroll_delta(top - position.y()))
201 }
202 if position.y() > bottom {
203 scroll_delta.set_y(scale_vertical_mouse_autoscroll_delta(position.y() - bottom))
204 }
205
206 let horizontal_margin = layout.line_height.min(rect.width() / 3.0);
207 let left = rect.origin_x() + horizontal_margin;
208 let right = rect.upper_right().x() - horizontal_margin;
209 if position.x() < left {
210 scroll_delta.set_x(-scale_horizontal_mouse_autoscroll_delta(
211 left - position.x(),
212 ))
213 }
214 if position.x() > right {
215 scroll_delta.set_x(scale_horizontal_mouse_autoscroll_delta(
216 position.x() - right,
217 ))
218 }
219
220 let snapshot = self.snapshot(cx.app);
221 let (position, overshoot) = paint.point_for_position(&snapshot, layout, position);
222
223 cx.dispatch_action(Select(SelectPhase::Update {
224 position,
225 overshoot: overshoot.column(),
226 scroll_position: (snapshot.scroll_position() + scroll_delta)
227 .clamp(Vector2F::zero(), layout.scroll_max),
228 }));
229 true
230 } else {
231 false
232 }
233 }
234
235 fn mouse_moved(
236 &self,
237 position: Vector2F,
238 cmd: bool,
239 layout: &LayoutState,
240 paint: &PaintState,
241 cx: &mut EventContext,
242 ) -> bool {
243 // This will be handled more correctly once https://github.com/zed-industries/zed/issues/1218 is completed
244 // Don't trigger hover popover if mouse is hovering over context menu
245 let point = if paint.text_bounds.contains_point(position) {
246 let (point, overshoot) = paint.point_for_position(&self.snapshot(cx), layout, position);
247 if overshoot.is_zero() {
248 Some(point)
249 } else {
250 None
251 }
252 } else {
253 None
254 };
255
256 cx.dispatch_action(UpdateGoToDefinitionLink {
257 point,
258 cmd_held: cmd,
259 });
260
261 if paint
262 .context_menu_bounds
263 .map_or(false, |context_menu_bounds| {
264 context_menu_bounds.contains_point(position)
265 })
266 {
267 return false;
268 }
269
270 if paint
271 .hover_bounds
272 .map_or(false, |hover_bounds| hover_bounds.contains_point(position))
273 {
274 return false;
275 }
276
277 cx.dispatch_action(HoverAt { point });
278 true
279 }
280
281 fn modifiers_changed(&self, cmd: bool, cx: &mut EventContext) -> bool {
282 cx.dispatch_action(CmdChanged { cmd_down: cmd });
283 false
284 }
285
286 fn scroll(
287 &self,
288 position: Vector2F,
289 mut delta: Vector2F,
290 precise: bool,
291 layout: &mut LayoutState,
292 paint: &mut PaintState,
293 cx: &mut EventContext,
294 ) -> bool {
295 if !paint.bounds.contains_point(position) {
296 return false;
297 }
298
299 let snapshot = self.snapshot(cx.app);
300 let max_glyph_width = layout.em_width;
301 if !precise {
302 delta *= vec2f(max_glyph_width, layout.line_height);
303 }
304
305 let scroll_position = snapshot.scroll_position();
306 let x = (scroll_position.x() * max_glyph_width - delta.x()) / max_glyph_width;
307 let y = (scroll_position.y() * layout.line_height - delta.y()) / layout.line_height;
308 let scroll_position = vec2f(x, y).clamp(Vector2F::zero(), layout.scroll_max);
309
310 cx.dispatch_action(Scroll(scroll_position));
311
312 true
313 }
314
315 fn paint_background(
316 &self,
317 gutter_bounds: RectF,
318 text_bounds: RectF,
319 layout: &LayoutState,
320 cx: &mut PaintContext,
321 ) {
322 let bounds = gutter_bounds.union_rect(text_bounds);
323 let scroll_top = layout.snapshot.scroll_position().y() * layout.line_height;
324 let editor = self.view(cx.app);
325 cx.scene.push_quad(Quad {
326 bounds: gutter_bounds,
327 background: Some(self.style.gutter_background),
328 border: Border::new(0., Color::transparent_black()),
329 corner_radius: 0.,
330 });
331 cx.scene.push_quad(Quad {
332 bounds: text_bounds,
333 background: Some(self.style.background),
334 border: Border::new(0., Color::transparent_black()),
335 corner_radius: 0.,
336 });
337
338 if let EditorMode::Full = editor.mode {
339 let mut active_rows = layout.active_rows.iter().peekable();
340 while let Some((start_row, contains_non_empty_selection)) = active_rows.next() {
341 let mut end_row = *start_row;
342 while active_rows.peek().map_or(false, |r| {
343 *r.0 == end_row + 1 && r.1 == contains_non_empty_selection
344 }) {
345 active_rows.next().unwrap();
346 end_row += 1;
347 }
348
349 if !contains_non_empty_selection {
350 let origin = vec2f(
351 bounds.origin_x(),
352 bounds.origin_y() + (layout.line_height * *start_row as f32) - scroll_top,
353 );
354 let size = vec2f(
355 bounds.width(),
356 layout.line_height * (end_row - start_row + 1) as f32,
357 );
358 cx.scene.push_quad(Quad {
359 bounds: RectF::new(origin, size),
360 background: Some(self.style.active_line_background),
361 border: Border::default(),
362 corner_radius: 0.,
363 });
364 }
365 }
366
367 if let Some(highlighted_rows) = &layout.highlighted_rows {
368 let origin = vec2f(
369 bounds.origin_x(),
370 bounds.origin_y() + (layout.line_height * highlighted_rows.start as f32)
371 - scroll_top,
372 );
373 let size = vec2f(
374 bounds.width(),
375 layout.line_height * highlighted_rows.len() as f32,
376 );
377 cx.scene.push_quad(Quad {
378 bounds: RectF::new(origin, size),
379 background: Some(self.style.highlighted_line_background),
380 border: Border::default(),
381 corner_radius: 0.,
382 });
383 }
384 }
385 }
386
387 fn paint_gutter(
388 &mut self,
389 bounds: RectF,
390 visible_bounds: RectF,
391 layout: &mut LayoutState,
392 cx: &mut PaintContext,
393 ) {
394 let scroll_top = layout.snapshot.scroll_position().y() * layout.line_height;
395 for (ix, line) in layout.line_number_layouts.iter().enumerate() {
396 if let Some(line) = line {
397 let line_origin = bounds.origin()
398 + vec2f(
399 bounds.width() - line.width() - layout.gutter_padding,
400 ix as f32 * layout.line_height - (scroll_top % layout.line_height),
401 );
402 line.paint(line_origin, visible_bounds, layout.line_height, cx);
403 }
404 }
405
406 if let Some((row, indicator)) = layout.code_actions_indicator.as_mut() {
407 let mut x = bounds.width() - layout.gutter_padding;
408 let mut y = *row as f32 * layout.line_height - scroll_top;
409 x += ((layout.gutter_padding + layout.gutter_margin) - indicator.size().x()) / 2.;
410 y += (layout.line_height - indicator.size().y()) / 2.;
411 indicator.paint(bounds.origin() + vec2f(x, y), visible_bounds, cx);
412 }
413 }
414
415 fn paint_text(
416 &mut self,
417 bounds: RectF,
418 visible_bounds: RectF,
419 layout: &mut LayoutState,
420 paint: &mut PaintState,
421 cx: &mut PaintContext,
422 ) {
423 let view = self.view(cx.app);
424 let style = &self.style;
425 let local_replica_id = view.replica_id(cx);
426 let scroll_position = layout.snapshot.scroll_position();
427 let start_row = scroll_position.y() as u32;
428 let scroll_top = scroll_position.y() * layout.line_height;
429 let end_row = ((scroll_top + bounds.height()) / layout.line_height).ceil() as u32 + 1; // Add 1 to ensure selections bleed off screen
430 let max_glyph_width = layout.em_width;
431 let scroll_left = scroll_position.x() * max_glyph_width;
432 let content_origin = bounds.origin() + vec2f(layout.gutter_margin, 0.);
433
434 cx.scene.push_layer(Some(bounds));
435
436 cx.scene.push_cursor_region(CursorRegion {
437 bounds,
438 style: if !view.link_go_to_definition_state.definitions.is_empty() {
439 CursorStyle::PointingHand
440 } else {
441 CursorStyle::IBeam
442 },
443 });
444
445 for (range, color) in &layout.highlighted_ranges {
446 self.paint_highlighted_range(
447 range.clone(),
448 start_row,
449 end_row,
450 *color,
451 0.,
452 0.15 * layout.line_height,
453 layout,
454 content_origin,
455 scroll_top,
456 scroll_left,
457 bounds,
458 cx,
459 );
460 }
461
462 let mut cursors = SmallVec::<[Cursor; 32]>::new();
463 for (replica_id, selections) in &layout.selections {
464 let selection_style = style.replica_selection_style(*replica_id);
465 let corner_radius = 0.15 * layout.line_height;
466
467 for selection in selections {
468 self.paint_highlighted_range(
469 selection.range.clone(),
470 start_row,
471 end_row,
472 selection_style.selection,
473 corner_radius,
474 corner_radius * 2.,
475 layout,
476 content_origin,
477 scroll_top,
478 scroll_left,
479 bounds,
480 cx,
481 );
482
483 if view.show_local_cursors() || *replica_id != local_replica_id {
484 let cursor_position = selection.head;
485 if (start_row..end_row).contains(&cursor_position.row()) {
486 let cursor_row_layout =
487 &layout.line_layouts[(cursor_position.row() - start_row) as usize];
488 let cursor_column = cursor_position.column() as usize;
489
490 let cursor_character_x = cursor_row_layout.x_for_index(cursor_column);
491 let mut block_width =
492 cursor_row_layout.x_for_index(cursor_column + 1) - cursor_character_x;
493 if block_width == 0.0 {
494 block_width = layout.em_width;
495 }
496
497 let block_text =
498 if let CursorShape::Block = self.cursor_shape {
499 layout.snapshot.chars_at(cursor_position).next().and_then(
500 |character| {
501 let font_id =
502 cursor_row_layout.font_for_index(cursor_column)?;
503 let text = character.to_string();
504
505 Some(cx.text_layout_cache.layout_str(
506 &text,
507 cursor_row_layout.font_size(),
508 &[(
509 text.len(),
510 RunStyle {
511 font_id,
512 color: style.background,
513 underline: Default::default(),
514 },
515 )],
516 ))
517 },
518 )
519 } else {
520 None
521 };
522
523 let x = cursor_character_x - scroll_left;
524 let y = cursor_position.row() as f32 * layout.line_height - scroll_top;
525 cursors.push(Cursor {
526 color: selection_style.cursor,
527 block_width,
528 origin: vec2f(x, y),
529 line_height: layout.line_height,
530 shape: self.cursor_shape,
531 block_text,
532 });
533 }
534 }
535 }
536 }
537
538 if let Some(visible_text_bounds) = bounds.intersection(visible_bounds) {
539 // Draw glyphs
540 for (ix, line) in layout.line_layouts.iter().enumerate() {
541 let row = start_row + ix as u32;
542 line.paint(
543 content_origin
544 + vec2f(-scroll_left, row as f32 * layout.line_height - scroll_top),
545 visible_text_bounds,
546 layout.line_height,
547 cx,
548 );
549 }
550 }
551
552 cx.scene.push_layer(Some(bounds));
553 for cursor in cursors {
554 cursor.paint(content_origin, cx);
555 }
556 cx.scene.pop_layer();
557
558 if let Some((position, context_menu)) = layout.context_menu.as_mut() {
559 cx.scene.push_stacking_context(None);
560 let cursor_row_layout = &layout.line_layouts[(position.row() - start_row) as usize];
561 let x = cursor_row_layout.x_for_index(position.column() as usize) - scroll_left;
562 let y = (position.row() + 1) as f32 * layout.line_height - scroll_top;
563 let mut list_origin = content_origin + vec2f(x, y);
564 let list_width = context_menu.size().x();
565 let list_height = context_menu.size().y();
566
567 // Snap the right edge of the list to the right edge of the window if
568 // its horizontal bounds overflow.
569 if list_origin.x() + list_width > cx.window_size.x() {
570 list_origin.set_x((cx.window_size.x() - list_width).max(0.));
571 }
572
573 if list_origin.y() + list_height > bounds.max_y() {
574 list_origin.set_y(list_origin.y() - layout.line_height - list_height);
575 }
576
577 context_menu.paint(
578 list_origin,
579 RectF::from_points(Vector2F::zero(), vec2f(f32::MAX, f32::MAX)), // Let content bleed outside of editor
580 cx,
581 );
582
583 paint.context_menu_bounds = Some(RectF::new(list_origin, context_menu.size()));
584
585 cx.scene.pop_stacking_context();
586 }
587
588 if let Some((position, hover_popover)) = layout.hover.as_mut() {
589 cx.scene.push_stacking_context(None);
590
591 // This is safe because we check on layout whether the required row is available
592 let hovered_row_layout = &layout.line_layouts[(position.row() - start_row) as usize];
593 let size = hover_popover.size();
594 let x = hovered_row_layout.x_for_index(position.column() as usize) - scroll_left;
595 let y = position.row() as f32 * layout.line_height - scroll_top - size.y();
596 let mut popover_origin = content_origin + vec2f(x, y);
597
598 if popover_origin.y() < 0.0 {
599 popover_origin.set_y(popover_origin.y() + layout.line_height + size.y());
600 }
601
602 let x_out_of_bounds = bounds.max_x() - (popover_origin.x() + size.x());
603 if x_out_of_bounds < 0.0 {
604 popover_origin.set_x(popover_origin.x() + x_out_of_bounds);
605 }
606
607 hover_popover.paint(
608 popover_origin,
609 RectF::from_points(Vector2F::zero(), vec2f(f32::MAX, f32::MAX)), // Let content bleed outside of editor
610 cx,
611 );
612
613 paint.hover_bounds = Some(
614 RectF::new(popover_origin, hover_popover.size()).dilate(Vector2F::new(0., 5.)),
615 );
616
617 cx.scene.pop_stacking_context();
618 }
619
620 cx.scene.pop_layer();
621 }
622
623 fn paint_highlighted_range(
624 &self,
625 range: Range<DisplayPoint>,
626 start_row: u32,
627 end_row: u32,
628 color: Color,
629 corner_radius: f32,
630 line_end_overshoot: f32,
631 layout: &LayoutState,
632 content_origin: Vector2F,
633 scroll_top: f32,
634 scroll_left: f32,
635 bounds: RectF,
636 cx: &mut PaintContext,
637 ) {
638 if range.start != range.end {
639 let row_range = if range.end.column() == 0 {
640 cmp::max(range.start.row(), start_row)..cmp::min(range.end.row(), end_row)
641 } else {
642 cmp::max(range.start.row(), start_row)..cmp::min(range.end.row() + 1, end_row)
643 };
644
645 let highlighted_range = HighlightedRange {
646 color,
647 line_height: layout.line_height,
648 corner_radius,
649 start_y: content_origin.y() + row_range.start as f32 * layout.line_height
650 - scroll_top,
651 lines: row_range
652 .into_iter()
653 .map(|row| {
654 let line_layout = &layout.line_layouts[(row - start_row) as usize];
655 HighlightedRangeLine {
656 start_x: if row == range.start.row() {
657 content_origin.x()
658 + line_layout.x_for_index(range.start.column() as usize)
659 - scroll_left
660 } else {
661 content_origin.x() - scroll_left
662 },
663 end_x: if row == range.end.row() {
664 content_origin.x()
665 + line_layout.x_for_index(range.end.column() as usize)
666 - scroll_left
667 } else {
668 content_origin.x() + line_layout.width() + line_end_overshoot
669 - scroll_left
670 },
671 }
672 })
673 .collect(),
674 };
675
676 highlighted_range.paint(bounds, cx.scene);
677 }
678 }
679
680 fn paint_blocks(
681 &mut self,
682 bounds: RectF,
683 visible_bounds: RectF,
684 layout: &mut LayoutState,
685 cx: &mut PaintContext,
686 ) {
687 let scroll_position = layout.snapshot.scroll_position();
688 let scroll_left = scroll_position.x() * layout.em_width;
689 let scroll_top = scroll_position.y() * layout.line_height;
690
691 for block in &mut layout.blocks {
692 let mut origin =
693 bounds.origin() + vec2f(0., block.row as f32 * layout.line_height - scroll_top);
694 if !matches!(block.style, BlockStyle::Sticky) {
695 origin += vec2f(-scroll_left, 0.);
696 }
697 block.element.paint(origin, visible_bounds, cx);
698 }
699 }
700
701 fn max_line_number_width(&self, snapshot: &EditorSnapshot, cx: &LayoutContext) -> f32 {
702 let digit_count = (snapshot.max_buffer_row() as f32).log10().floor() as usize + 1;
703 let style = &self.style;
704
705 cx.text_layout_cache
706 .layout_str(
707 "1".repeat(digit_count).as_str(),
708 style.text.font_size,
709 &[(
710 digit_count,
711 RunStyle {
712 font_id: style.text.font_id,
713 color: Color::black(),
714 underline: Default::default(),
715 },
716 )],
717 )
718 .width()
719 }
720
721 fn layout_line_numbers(
722 &self,
723 rows: Range<u32>,
724 active_rows: &BTreeMap<u32, bool>,
725 snapshot: &EditorSnapshot,
726 cx: &LayoutContext,
727 ) -> Vec<Option<text_layout::Line>> {
728 let style = &self.style;
729 let include_line_numbers = snapshot.mode == EditorMode::Full;
730 let mut line_number_layouts = Vec::with_capacity(rows.len());
731 let mut line_number = String::new();
732 for (ix, row) in snapshot
733 .buffer_rows(rows.start)
734 .take((rows.end - rows.start) as usize)
735 .enumerate()
736 {
737 let display_row = rows.start + ix as u32;
738 let color = if active_rows.contains_key(&display_row) {
739 style.line_number_active
740 } else {
741 style.line_number
742 };
743 if let Some(buffer_row) = row {
744 if include_line_numbers {
745 line_number.clear();
746 write!(&mut line_number, "{}", buffer_row + 1).unwrap();
747 line_number_layouts.push(Some(cx.text_layout_cache.layout_str(
748 &line_number,
749 style.text.font_size,
750 &[(
751 line_number.len(),
752 RunStyle {
753 font_id: style.text.font_id,
754 color,
755 underline: Default::default(),
756 },
757 )],
758 )));
759 }
760 } else {
761 line_number_layouts.push(None);
762 }
763 }
764
765 line_number_layouts
766 }
767
768 fn layout_lines(
769 &mut self,
770 rows: Range<u32>,
771 snapshot: &EditorSnapshot,
772 cx: &LayoutContext,
773 ) -> Vec<text_layout::Line> {
774 if rows.start >= rows.end {
775 return Vec::new();
776 }
777
778 // When the editor is empty and unfocused, then show the placeholder.
779 if snapshot.is_empty() && !snapshot.is_focused() {
780 let placeholder_style = self
781 .style
782 .placeholder_text
783 .as_ref()
784 .unwrap_or_else(|| &self.style.text);
785 let placeholder_text = snapshot.placeholder_text();
786 let placeholder_lines = placeholder_text
787 .as_ref()
788 .map_or("", AsRef::as_ref)
789 .split('\n')
790 .skip(rows.start as usize)
791 .chain(iter::repeat(""))
792 .take(rows.len());
793 return placeholder_lines
794 .map(|line| {
795 cx.text_layout_cache.layout_str(
796 line,
797 placeholder_style.font_size,
798 &[(
799 line.len(),
800 RunStyle {
801 font_id: placeholder_style.font_id,
802 color: placeholder_style.color,
803 underline: Default::default(),
804 },
805 )],
806 )
807 })
808 .collect();
809 } else {
810 let style = &self.style;
811 let chunks = snapshot.chunks(rows.clone(), true).map(|chunk| {
812 let mut highlight_style = chunk
813 .syntax_highlight_id
814 .and_then(|id| id.style(&style.syntax));
815
816 if let Some(chunk_highlight) = chunk.highlight_style {
817 if let Some(highlight_style) = highlight_style.as_mut() {
818 highlight_style.highlight(chunk_highlight);
819 } else {
820 highlight_style = Some(chunk_highlight);
821 }
822 }
823
824 let mut diagnostic_highlight = HighlightStyle::default();
825
826 if chunk.is_unnecessary {
827 diagnostic_highlight.fade_out = Some(style.unnecessary_code_fade);
828 }
829
830 if let Some(severity) = chunk.diagnostic_severity {
831 // Omit underlines for HINT/INFO diagnostics on 'unnecessary' code.
832 if severity <= DiagnosticSeverity::WARNING || !chunk.is_unnecessary {
833 let diagnostic_style = super::diagnostic_style(severity, true, style);
834 diagnostic_highlight.underline = Some(Underline {
835 color: Some(diagnostic_style.message.text.color),
836 thickness: 1.0.into(),
837 squiggly: true,
838 });
839 }
840 }
841
842 if let Some(highlight_style) = highlight_style.as_mut() {
843 highlight_style.highlight(diagnostic_highlight);
844 } else {
845 highlight_style = Some(diagnostic_highlight);
846 }
847
848 (chunk.text, highlight_style)
849 });
850 layout_highlighted_chunks(
851 chunks,
852 &style.text,
853 &cx.text_layout_cache,
854 &cx.font_cache,
855 MAX_LINE_LEN,
856 rows.len() as usize,
857 )
858 }
859 }
860
861 fn layout_blocks(
862 &mut self,
863 rows: Range<u32>,
864 snapshot: &EditorSnapshot,
865 editor_width: f32,
866 scroll_width: f32,
867 gutter_padding: f32,
868 gutter_width: f32,
869 em_width: f32,
870 text_x: f32,
871 line_height: f32,
872 style: &EditorStyle,
873 line_layouts: &[text_layout::Line],
874 cx: &mut LayoutContext,
875 ) -> (f32, Vec<BlockLayout>) {
876 let editor = if let Some(editor) = self.view.upgrade(cx) {
877 editor
878 } else {
879 return Default::default();
880 };
881
882 let tooltip_style = cx.global::<Settings>().theme.tooltip.clone();
883 let scroll_x = snapshot.scroll_position.x();
884 let (fixed_blocks, non_fixed_blocks) = snapshot
885 .blocks_in_range(rows.clone())
886 .partition::<Vec<_>, _>(|(_, block)| match block {
887 TransformBlock::ExcerptHeader { .. } => false,
888 TransformBlock::Custom(block) => block.style() == BlockStyle::Fixed,
889 });
890 let mut render_block = |block: &TransformBlock, width: f32| {
891 let mut element = match block {
892 TransformBlock::Custom(block) => {
893 let align_to = block
894 .position()
895 .to_point(&snapshot.buffer_snapshot)
896 .to_display_point(snapshot);
897 let anchor_x = text_x
898 + if rows.contains(&align_to.row()) {
899 line_layouts[(align_to.row() - rows.start) as usize]
900 .x_for_index(align_to.column() as usize)
901 } else {
902 layout_line(align_to.row(), snapshot, style, cx.text_layout_cache)
903 .x_for_index(align_to.column() as usize)
904 };
905
906 cx.render(&editor, |_, cx| {
907 block.render(&mut BlockContext {
908 cx,
909 anchor_x,
910 gutter_padding,
911 line_height,
912 scroll_x,
913 gutter_width,
914 em_width,
915 })
916 })
917 }
918 TransformBlock::ExcerptHeader {
919 key,
920 buffer,
921 range,
922 starts_new_buffer,
923 ..
924 } => {
925 let jump_icon = project::File::from_dyn(buffer.file()).map(|file| {
926 let jump_position = range
927 .primary
928 .as_ref()
929 .map_or(range.context.start, |primary| primary.start);
930 let jump_action = crate::Jump {
931 path: ProjectPath {
932 worktree_id: file.worktree_id(cx),
933 path: file.path.clone(),
934 },
935 position: language::ToPoint::to_point(&jump_position, buffer),
936 anchor: jump_position,
937 };
938
939 enum JumpIcon {}
940 cx.render(&editor, |_, cx| {
941 MouseEventHandler::new::<JumpIcon, _, _>(*key, cx, |state, _| {
942 let style = style.jump_icon.style_for(state, false);
943 Svg::new("icons/arrow_up_right_8.svg")
944 .with_color(style.color)
945 .constrained()
946 .with_width(style.icon_width)
947 .aligned()
948 .contained()
949 .with_style(style.container)
950 .constrained()
951 .with_width(style.button_width)
952 .with_height(style.button_width)
953 .boxed()
954 })
955 .with_cursor_style(CursorStyle::PointingHand)
956 .on_click(MouseButton::Left, move |_, cx| {
957 cx.dispatch_action(jump_action.clone())
958 })
959 .with_tooltip::<JumpIcon, _>(
960 *key,
961 "Jump to Buffer".to_string(),
962 Some(Box::new(crate::OpenExcerpts)),
963 tooltip_style.clone(),
964 cx,
965 )
966 .aligned()
967 .flex_float()
968 .boxed()
969 })
970 });
971
972 if *starts_new_buffer {
973 let style = &self.style.diagnostic_path_header;
974 let font_size =
975 (style.text_scale_factor * self.style.text.font_size).round();
976
977 let mut filename = None;
978 let mut parent_path = None;
979 if let Some(file) = buffer.file() {
980 let path = file.path();
981 filename = path.file_name().map(|f| f.to_string_lossy().to_string());
982 parent_path =
983 path.parent().map(|p| p.to_string_lossy().to_string() + "/");
984 }
985
986 Flex::row()
987 .with_child(
988 Label::new(
989 filename.unwrap_or_else(|| "untitled".to_string()),
990 style.filename.text.clone().with_font_size(font_size),
991 )
992 .contained()
993 .with_style(style.filename.container)
994 .aligned()
995 .boxed(),
996 )
997 .with_children(parent_path.map(|path| {
998 Label::new(path, style.path.text.clone().with_font_size(font_size))
999 .contained()
1000 .with_style(style.path.container)
1001 .aligned()
1002 .boxed()
1003 }))
1004 .with_children(jump_icon)
1005 .contained()
1006 .with_style(style.container)
1007 .with_padding_left(gutter_padding)
1008 .with_padding_right(gutter_padding)
1009 .expanded()
1010 .named("path header block")
1011 } else {
1012 let text_style = self.style.text.clone();
1013 Flex::row()
1014 .with_child(Label::new("…".to_string(), text_style).boxed())
1015 .with_children(jump_icon)
1016 .contained()
1017 .with_padding_left(gutter_padding)
1018 .with_padding_right(gutter_padding)
1019 .expanded()
1020 .named("collapsed context")
1021 }
1022 }
1023 };
1024
1025 element.layout(
1026 SizeConstraint {
1027 min: Vector2F::zero(),
1028 max: vec2f(width, block.height() as f32 * line_height),
1029 },
1030 cx,
1031 );
1032 element
1033 };
1034
1035 let mut fixed_block_max_width = 0f32;
1036 let mut blocks = Vec::new();
1037 for (row, block) in fixed_blocks {
1038 let element = render_block(block, f32::INFINITY);
1039 fixed_block_max_width = fixed_block_max_width.max(element.size().x() + em_width);
1040 blocks.push(BlockLayout {
1041 row,
1042 element,
1043 style: BlockStyle::Fixed,
1044 });
1045 }
1046 for (row, block) in non_fixed_blocks {
1047 let style = match block {
1048 TransformBlock::Custom(block) => block.style(),
1049 TransformBlock::ExcerptHeader { .. } => BlockStyle::Sticky,
1050 };
1051 let width = match style {
1052 BlockStyle::Sticky => editor_width,
1053 BlockStyle::Flex => editor_width
1054 .max(fixed_block_max_width)
1055 .max(gutter_width + scroll_width),
1056 BlockStyle::Fixed => unreachable!(),
1057 };
1058 let element = render_block(block, width);
1059 blocks.push(BlockLayout {
1060 row,
1061 element,
1062 style,
1063 });
1064 }
1065 (
1066 scroll_width.max(fixed_block_max_width - gutter_width),
1067 blocks,
1068 )
1069 }
1070}
1071
1072impl Element for EditorElement {
1073 type LayoutState = LayoutState;
1074 type PaintState = PaintState;
1075
1076 fn layout(
1077 &mut self,
1078 constraint: SizeConstraint,
1079 cx: &mut LayoutContext,
1080 ) -> (Vector2F, Self::LayoutState) {
1081 let mut size = constraint.max;
1082 if size.x().is_infinite() {
1083 unimplemented!("we don't yet handle an infinite width constraint on buffer elements");
1084 }
1085
1086 let snapshot = self.snapshot(cx.app);
1087 let style = self.style.clone();
1088 let line_height = style.text.line_height(cx.font_cache);
1089
1090 let gutter_padding;
1091 let gutter_width;
1092 let gutter_margin;
1093 if snapshot.mode == EditorMode::Full {
1094 gutter_padding = style.text.em_width(cx.font_cache) * style.gutter_padding_factor;
1095 gutter_width = self.max_line_number_width(&snapshot, cx) + gutter_padding * 2.0;
1096 gutter_margin = -style.text.descent(cx.font_cache);
1097 } else {
1098 gutter_padding = 0.0;
1099 gutter_width = 0.0;
1100 gutter_margin = 0.0;
1101 };
1102
1103 let text_width = size.x() - gutter_width;
1104 let em_width = style.text.em_width(cx.font_cache);
1105 let em_advance = style.text.em_advance(cx.font_cache);
1106 let overscroll = vec2f(em_width, 0.);
1107 let snapshot = self.update_view(cx.app, |view, cx| {
1108 let wrap_width = match view.soft_wrap_mode(cx) {
1109 SoftWrap::None => Some((MAX_LINE_LEN / 2) as f32 * em_advance),
1110 SoftWrap::EditorWidth => {
1111 Some(text_width - gutter_margin - overscroll.x() - em_width)
1112 }
1113 SoftWrap::Column(column) => Some(column as f32 * em_advance),
1114 };
1115
1116 if view.set_wrap_width(wrap_width, cx) {
1117 view.snapshot(cx)
1118 } else {
1119 snapshot
1120 }
1121 });
1122
1123 let scroll_height = (snapshot.max_point().row() + 1) as f32 * line_height;
1124 if let EditorMode::AutoHeight { max_lines } = snapshot.mode {
1125 size.set_y(
1126 scroll_height
1127 .min(constraint.max_along(Axis::Vertical))
1128 .max(constraint.min_along(Axis::Vertical))
1129 .min(line_height * max_lines as f32),
1130 )
1131 } else if let EditorMode::SingleLine = snapshot.mode {
1132 size.set_y(
1133 line_height
1134 .min(constraint.max_along(Axis::Vertical))
1135 .max(constraint.min_along(Axis::Vertical)),
1136 )
1137 } else if size.y().is_infinite() {
1138 size.set_y(scroll_height);
1139 }
1140 let gutter_size = vec2f(gutter_width, size.y());
1141 let text_size = vec2f(text_width, size.y());
1142
1143 let (autoscroll_horizontally, mut snapshot) = self.update_view(cx.app, |view, cx| {
1144 let autoscroll_horizontally = view.autoscroll_vertically(size.y(), line_height, cx);
1145 let snapshot = view.snapshot(cx);
1146 (autoscroll_horizontally, snapshot)
1147 });
1148
1149 let scroll_position = snapshot.scroll_position();
1150 let start_row = scroll_position.y() as u32;
1151 let scroll_top = scroll_position.y() * line_height;
1152
1153 // Add 1 to ensure selections bleed off screen
1154 let end_row = 1 + cmp::min(
1155 ((scroll_top + size.y()) / line_height).ceil() as u32,
1156 snapshot.max_point().row(),
1157 );
1158
1159 let start_anchor = if start_row == 0 {
1160 Anchor::min()
1161 } else {
1162 snapshot
1163 .buffer_snapshot
1164 .anchor_before(DisplayPoint::new(start_row, 0).to_offset(&snapshot, Bias::Left))
1165 };
1166 let end_anchor = if end_row > snapshot.max_point().row() {
1167 Anchor::max()
1168 } else {
1169 snapshot
1170 .buffer_snapshot
1171 .anchor_before(DisplayPoint::new(end_row, 0).to_offset(&snapshot, Bias::Right))
1172 };
1173
1174 let mut selections: Vec<(ReplicaId, Vec<SelectionLayout>)> = Vec::new();
1175 let mut active_rows = BTreeMap::new();
1176 let mut highlighted_rows = None;
1177 let mut highlighted_ranges = Vec::new();
1178 self.update_view(cx.app, |view, cx| {
1179 let display_map = view.display_map.update(cx, |map, cx| map.snapshot(cx));
1180
1181 highlighted_rows = view.highlighted_rows();
1182 let theme = cx.global::<Settings>().theme.as_ref();
1183 highlighted_ranges = view.background_highlights_in_range(
1184 start_anchor.clone()..end_anchor.clone(),
1185 &display_map,
1186 theme,
1187 );
1188
1189 let mut remote_selections = HashMap::default();
1190 for (replica_id, line_mode, selection) in display_map
1191 .buffer_snapshot
1192 .remote_selections_in_range(&(start_anchor.clone()..end_anchor.clone()))
1193 {
1194 // The local selections match the leader's selections.
1195 if Some(replica_id) == view.leader_replica_id {
1196 continue;
1197 }
1198 remote_selections
1199 .entry(replica_id)
1200 .or_insert(Vec::new())
1201 .push(SelectionLayout::new(selection, line_mode, &display_map));
1202 }
1203 selections.extend(remote_selections);
1204
1205 if view.show_local_selections {
1206 let mut local_selections = view
1207 .selections
1208 .disjoint_in_range(start_anchor..end_anchor, cx);
1209 local_selections.extend(view.selections.pending(cx));
1210 for selection in &local_selections {
1211 let is_empty = selection.start == selection.end;
1212 let selection_start = snapshot.prev_line_boundary(selection.start).1;
1213 let selection_end = snapshot.next_line_boundary(selection.end).1;
1214 for row in cmp::max(selection_start.row(), start_row)
1215 ..=cmp::min(selection_end.row(), end_row)
1216 {
1217 let contains_non_empty_selection =
1218 active_rows.entry(row).or_insert(!is_empty);
1219 *contains_non_empty_selection |= !is_empty;
1220 }
1221 }
1222
1223 // Render the local selections in the leader's color when following.
1224 let local_replica_id = view.leader_replica_id.unwrap_or(view.replica_id(cx));
1225
1226 selections.push((
1227 local_replica_id,
1228 local_selections
1229 .into_iter()
1230 .map(|selection| {
1231 SelectionLayout::new(selection, view.selections.line_mode, &display_map)
1232 })
1233 .collect(),
1234 ));
1235 }
1236 });
1237
1238 let line_number_layouts =
1239 self.layout_line_numbers(start_row..end_row, &active_rows, &snapshot, cx);
1240
1241 let mut max_visible_line_width = 0.0;
1242 let line_layouts = self.layout_lines(start_row..end_row, &snapshot, cx);
1243 for line in &line_layouts {
1244 if line.width() > max_visible_line_width {
1245 max_visible_line_width = line.width();
1246 }
1247 }
1248
1249 let style = self.style.clone();
1250 let longest_line_width = layout_line(
1251 snapshot.longest_row(),
1252 &snapshot,
1253 &style,
1254 cx.text_layout_cache,
1255 )
1256 .width();
1257 let scroll_width = longest_line_width.max(max_visible_line_width) + overscroll.x();
1258 let em_width = style.text.em_width(cx.font_cache);
1259 let (scroll_width, blocks) = self.layout_blocks(
1260 start_row..end_row,
1261 &snapshot,
1262 size.x(),
1263 scroll_width,
1264 gutter_padding,
1265 gutter_width,
1266 em_width,
1267 gutter_width + gutter_margin,
1268 line_height,
1269 &style,
1270 &line_layouts,
1271 cx,
1272 );
1273
1274 let max_row = snapshot.max_point().row();
1275 let scroll_max = vec2f(
1276 ((scroll_width - text_size.x()) / em_width).max(0.0),
1277 max_row.saturating_sub(1) as f32,
1278 );
1279
1280 self.update_view(cx.app, |view, cx| {
1281 let clamped = view.clamp_scroll_left(scroll_max.x());
1282 let autoscrolled;
1283 if autoscroll_horizontally {
1284 autoscrolled = view.autoscroll_horizontally(
1285 start_row,
1286 text_size.x(),
1287 scroll_width,
1288 em_width,
1289 &line_layouts,
1290 cx,
1291 );
1292 } else {
1293 autoscrolled = false;
1294 }
1295
1296 if clamped || autoscrolled {
1297 snapshot = view.snapshot(cx);
1298 }
1299 });
1300
1301 let mut context_menu = None;
1302 let mut code_actions_indicator = None;
1303 let mut hover = None;
1304 cx.render(&self.view.upgrade(cx).unwrap(), |view, cx| {
1305 let newest_selection_head = view
1306 .selections
1307 .newest::<usize>(cx)
1308 .head()
1309 .to_display_point(&snapshot);
1310
1311 let style = view.style(cx);
1312 if (start_row..end_row).contains(&newest_selection_head.row()) {
1313 if view.context_menu_visible() {
1314 context_menu =
1315 view.render_context_menu(newest_selection_head, style.clone(), cx);
1316 }
1317
1318 code_actions_indicator = view
1319 .render_code_actions_indicator(&style, cx)
1320 .map(|indicator| (newest_selection_head.row(), indicator));
1321 }
1322
1323 hover = view.hover_state.popover.clone().and_then(|hover| {
1324 let (point, rendered) = hover.render(&snapshot, style.clone(), cx);
1325 if point.row() >= snapshot.scroll_position().y() as u32 {
1326 if line_layouts.len() > (point.row() - start_row) as usize {
1327 return Some((point, rendered));
1328 }
1329 }
1330
1331 None
1332 });
1333 });
1334
1335 if let Some((_, context_menu)) = context_menu.as_mut() {
1336 context_menu.layout(
1337 SizeConstraint {
1338 min: Vector2F::zero(),
1339 max: vec2f(
1340 cx.window_size.x() * 0.7,
1341 (12. * line_height).min((size.y() - line_height) / 2.),
1342 ),
1343 },
1344 cx,
1345 );
1346 }
1347
1348 if let Some((_, indicator)) = code_actions_indicator.as_mut() {
1349 indicator.layout(
1350 SizeConstraint::strict_along(Axis::Vertical, line_height * 0.618),
1351 cx,
1352 );
1353 }
1354
1355 if let Some((_, hover)) = hover.as_mut() {
1356 hover.layout(
1357 SizeConstraint {
1358 min: Vector2F::zero(),
1359 max: vec2f(
1360 (120. * em_width) // Default size
1361 .min(size.x() / 2.) // Shrink to half of the editor width
1362 .max(20. * em_width), // Apply minimum width of 20 characters
1363 (16. * line_height) // Default size
1364 .min(size.y() / 2.) // Shrink to half of the editor height
1365 .max(4. * line_height), // Apply minimum height of 4 lines
1366 ),
1367 },
1368 cx,
1369 );
1370 }
1371
1372 (
1373 size,
1374 LayoutState {
1375 size,
1376 scroll_max,
1377 gutter_size,
1378 gutter_padding,
1379 text_size,
1380 gutter_margin,
1381 snapshot,
1382 active_rows,
1383 highlighted_rows,
1384 highlighted_ranges,
1385 line_layouts,
1386 line_number_layouts,
1387 blocks,
1388 line_height,
1389 em_width,
1390 em_advance,
1391 selections,
1392 context_menu,
1393 code_actions_indicator,
1394 hover,
1395 },
1396 )
1397 }
1398
1399 fn paint(
1400 &mut self,
1401 bounds: RectF,
1402 visible_bounds: RectF,
1403 layout: &mut Self::LayoutState,
1404 cx: &mut PaintContext,
1405 ) -> Self::PaintState {
1406 cx.scene.push_layer(Some(bounds));
1407
1408 let gutter_bounds = RectF::new(bounds.origin(), layout.gutter_size);
1409 let text_bounds = RectF::new(
1410 bounds.origin() + vec2f(layout.gutter_size.x(), 0.0),
1411 layout.text_size,
1412 );
1413
1414 let mut paint_state = PaintState {
1415 bounds,
1416 gutter_bounds,
1417 text_bounds,
1418 context_menu_bounds: None,
1419 hover_bounds: None,
1420 };
1421
1422 self.paint_background(gutter_bounds, text_bounds, layout, cx);
1423 if layout.gutter_size.x() > 0. {
1424 self.paint_gutter(gutter_bounds, visible_bounds, layout, cx);
1425 }
1426 self.paint_text(text_bounds, visible_bounds, layout, &mut paint_state, cx);
1427
1428 if !layout.blocks.is_empty() {
1429 cx.scene.push_layer(Some(bounds));
1430 self.paint_blocks(bounds, visible_bounds, layout, cx);
1431 cx.scene.pop_layer();
1432 }
1433
1434 cx.scene.pop_layer();
1435
1436 paint_state
1437 }
1438
1439 fn dispatch_event(
1440 &mut self,
1441 event: &Event,
1442 _: RectF,
1443 _: RectF,
1444 layout: &mut LayoutState,
1445 paint: &mut PaintState,
1446 cx: &mut EventContext,
1447 ) -> bool {
1448 if let Some((_, context_menu)) = &mut layout.context_menu {
1449 if context_menu.dispatch_event(event, cx) {
1450 return true;
1451 }
1452 }
1453
1454 if let Some((_, indicator)) = &mut layout.code_actions_indicator {
1455 if indicator.dispatch_event(event, cx) {
1456 return true;
1457 }
1458 }
1459
1460 if let Some((_, hover)) = &mut layout.hover {
1461 if hover.dispatch_event(event, cx) {
1462 return true;
1463 }
1464 }
1465
1466 for block in &mut layout.blocks {
1467 if block.element.dispatch_event(event, cx) {
1468 return true;
1469 }
1470 }
1471
1472 match event {
1473 Event::MouseDown(MouseButtonEvent {
1474 button: MouseButton::Left,
1475 position,
1476 cmd,
1477 alt,
1478 shift,
1479 click_count,
1480 ..
1481 }) => self.mouse_down(
1482 *position,
1483 *cmd,
1484 *alt,
1485 *shift,
1486 *click_count,
1487 layout,
1488 paint,
1489 cx,
1490 ),
1491 Event::MouseDown(MouseButtonEvent {
1492 button: MouseButton::Right,
1493 position,
1494 ..
1495 }) => self.mouse_right_down(*position, layout, paint, cx),
1496 Event::MouseUp(MouseButtonEvent {
1497 button: MouseButton::Left,
1498 position,
1499 ..
1500 }) => self.mouse_up(*position, cx),
1501 Event::MouseMoved(MouseMovedEvent {
1502 pressed_button: Some(MouseButton::Left),
1503 position,
1504 ..
1505 }) => self.mouse_dragged(*position, layout, paint, cx),
1506 Event::ScrollWheel(ScrollWheelEvent {
1507 position,
1508 delta,
1509 precise,
1510 }) => self.scroll(*position, *delta, *precise, layout, paint, cx),
1511 Event::ModifiersChanged(ModifiersChangedEvent { cmd, .. }) => {
1512 self.modifiers_changed(*cmd, cx)
1513 }
1514 Event::MouseMoved(MouseMovedEvent { position, cmd, .. }) => {
1515 self.mouse_moved(*position, *cmd, layout, paint, cx)
1516 }
1517
1518 _ => false,
1519 }
1520 }
1521
1522 fn rect_for_text_range(
1523 &self,
1524 range_utf16: Range<usize>,
1525 bounds: RectF,
1526 _: RectF,
1527 layout: &Self::LayoutState,
1528 _: &Self::PaintState,
1529 _: &gpui::MeasurementContext,
1530 ) -> Option<RectF> {
1531 let text_bounds = RectF::new(
1532 bounds.origin() + vec2f(layout.gutter_size.x(), 0.0),
1533 layout.text_size,
1534 );
1535 let content_origin = text_bounds.origin() + vec2f(layout.gutter_margin, 0.);
1536 let scroll_position = layout.snapshot.scroll_position();
1537 let start_row = scroll_position.y() as u32;
1538 let scroll_top = scroll_position.y() * layout.line_height;
1539 let scroll_left = scroll_position.x() * layout.em_width;
1540
1541 let range_start =
1542 OffsetUtf16(range_utf16.start).to_display_point(&layout.snapshot.display_snapshot);
1543 if range_start.row() < start_row {
1544 return None;
1545 }
1546
1547 let line = layout
1548 .line_layouts
1549 .get((range_start.row() - start_row) as usize)?;
1550 let range_start_x = line.x_for_index(range_start.column() as usize);
1551 let range_start_y = range_start.row() as f32 * layout.line_height;
1552 Some(RectF::new(
1553 content_origin + vec2f(range_start_x, range_start_y + layout.line_height)
1554 - vec2f(scroll_left, scroll_top),
1555 vec2f(layout.em_width, layout.line_height),
1556 ))
1557 }
1558
1559 fn debug(
1560 &self,
1561 bounds: RectF,
1562 _: &Self::LayoutState,
1563 _: &Self::PaintState,
1564 _: &gpui::DebugContext,
1565 ) -> json::Value {
1566 json!({
1567 "type": "BufferElement",
1568 "bounds": bounds.to_json()
1569 })
1570 }
1571}
1572
1573pub struct LayoutState {
1574 size: Vector2F,
1575 scroll_max: Vector2F,
1576 gutter_size: Vector2F,
1577 gutter_padding: f32,
1578 gutter_margin: f32,
1579 text_size: Vector2F,
1580 snapshot: EditorSnapshot,
1581 active_rows: BTreeMap<u32, bool>,
1582 highlighted_rows: Option<Range<u32>>,
1583 line_layouts: Vec<text_layout::Line>,
1584 line_number_layouts: Vec<Option<text_layout::Line>>,
1585 blocks: Vec<BlockLayout>,
1586 line_height: f32,
1587 em_width: f32,
1588 em_advance: f32,
1589 highlighted_ranges: Vec<(Range<DisplayPoint>, Color)>,
1590 selections: Vec<(ReplicaId, Vec<SelectionLayout>)>,
1591 context_menu: Option<(DisplayPoint, ElementBox)>,
1592 code_actions_indicator: Option<(u32, ElementBox)>,
1593 hover: Option<(DisplayPoint, ElementBox)>,
1594}
1595
1596struct BlockLayout {
1597 row: u32,
1598 element: ElementBox,
1599 style: BlockStyle,
1600}
1601
1602fn layout_line(
1603 row: u32,
1604 snapshot: &EditorSnapshot,
1605 style: &EditorStyle,
1606 layout_cache: &TextLayoutCache,
1607) -> text_layout::Line {
1608 let mut line = snapshot.line(row);
1609
1610 if line.len() > MAX_LINE_LEN {
1611 let mut len = MAX_LINE_LEN;
1612 while !line.is_char_boundary(len) {
1613 len -= 1;
1614 }
1615
1616 line.truncate(len);
1617 }
1618
1619 layout_cache.layout_str(
1620 &line,
1621 style.text.font_size,
1622 &[(
1623 snapshot.line_len(row) as usize,
1624 RunStyle {
1625 font_id: style.text.font_id,
1626 color: Color::black(),
1627 underline: Default::default(),
1628 },
1629 )],
1630 )
1631}
1632
1633pub struct PaintState {
1634 bounds: RectF,
1635 gutter_bounds: RectF,
1636 text_bounds: RectF,
1637 context_menu_bounds: Option<RectF>,
1638 hover_bounds: Option<RectF>,
1639}
1640
1641impl PaintState {
1642 /// Returns two display points. The first is the nearest valid
1643 /// position in the current buffer and the second is the distance to the
1644 /// nearest valid position if there was overshoot.
1645 fn point_for_position(
1646 &self,
1647 snapshot: &EditorSnapshot,
1648 layout: &LayoutState,
1649 position: Vector2F,
1650 ) -> (DisplayPoint, DisplayPoint) {
1651 let scroll_position = snapshot.scroll_position();
1652 let position = position - self.text_bounds.origin();
1653 let y = position.y().max(0.0).min(layout.size.y());
1654 let row = ((y / layout.line_height) + scroll_position.y()) as u32;
1655 let row_overshoot = row.saturating_sub(snapshot.max_point().row());
1656 let row = cmp::min(row, snapshot.max_point().row());
1657 let line = &layout.line_layouts[(row - scroll_position.y() as u32) as usize];
1658 let x = position.x() + (scroll_position.x() * layout.em_width);
1659
1660 let column = if x >= 0.0 {
1661 line.index_for_x(x)
1662 .map(|ix| ix as u32)
1663 .unwrap_or_else(|| snapshot.line_len(row))
1664 } else {
1665 0
1666 };
1667
1668 let point = snapshot.clip_point(DisplayPoint::new(row, column), Bias::Left);
1669 let mut column_overshoot = (0f32.max(x - line.width()) / layout.em_advance) as u32;
1670 column_overshoot = column_overshoot + column - point.column();
1671
1672 (point, DisplayPoint::new(row_overshoot, column_overshoot))
1673 }
1674}
1675
1676#[derive(Copy, Clone, PartialEq, Eq, Debug)]
1677pub enum CursorShape {
1678 Bar,
1679 Block,
1680 Underscore,
1681}
1682
1683impl Default for CursorShape {
1684 fn default() -> Self {
1685 CursorShape::Bar
1686 }
1687}
1688
1689#[derive(Debug)]
1690pub struct Cursor {
1691 origin: Vector2F,
1692 block_width: f32,
1693 line_height: f32,
1694 color: Color,
1695 shape: CursorShape,
1696 block_text: Option<Line>,
1697}
1698
1699impl Cursor {
1700 pub fn new(
1701 origin: Vector2F,
1702 block_width: f32,
1703 line_height: f32,
1704 color: Color,
1705 shape: CursorShape,
1706 block_text: Option<Line>,
1707 ) -> Cursor {
1708 Cursor {
1709 origin,
1710 block_width,
1711 line_height,
1712 color,
1713 shape,
1714 block_text,
1715 }
1716 }
1717
1718 pub fn bounding_rect(&self, origin: Vector2F) -> RectF {
1719 RectF::new(
1720 self.origin + origin,
1721 vec2f(self.block_width, self.line_height),
1722 )
1723 }
1724
1725 pub fn paint(&self, origin: Vector2F, cx: &mut PaintContext) {
1726 let bounds = match self.shape {
1727 CursorShape::Bar => RectF::new(self.origin + origin, vec2f(2.0, self.line_height)),
1728 CursorShape::Block => RectF::new(
1729 self.origin + origin,
1730 vec2f(self.block_width, self.line_height),
1731 ),
1732 CursorShape::Underscore => RectF::new(
1733 self.origin + origin + Vector2F::new(0.0, self.line_height - 2.0),
1734 vec2f(self.block_width, 2.0),
1735 ),
1736 };
1737
1738 cx.scene.push_quad(Quad {
1739 bounds,
1740 background: Some(self.color),
1741 border: Border::new(0., Color::black()),
1742 corner_radius: 0.,
1743 });
1744
1745 if let Some(block_text) = &self.block_text {
1746 block_text.paint(self.origin + origin, bounds, self.line_height, cx);
1747 }
1748 }
1749}
1750
1751#[derive(Debug)]
1752pub struct HighlightedRange {
1753 pub start_y: f32,
1754 pub line_height: f32,
1755 pub lines: Vec<HighlightedRangeLine>,
1756 pub color: Color,
1757 pub corner_radius: f32,
1758}
1759
1760#[derive(Debug)]
1761pub struct HighlightedRangeLine {
1762 pub start_x: f32,
1763 pub end_x: f32,
1764}
1765
1766impl HighlightedRange {
1767 pub fn paint(&self, bounds: RectF, scene: &mut Scene) {
1768 if self.lines.len() >= 2 && self.lines[0].start_x > self.lines[1].end_x {
1769 self.paint_lines(self.start_y, &self.lines[0..1], bounds, scene);
1770 self.paint_lines(
1771 self.start_y + self.line_height,
1772 &self.lines[1..],
1773 bounds,
1774 scene,
1775 );
1776 } else {
1777 self.paint_lines(self.start_y, &self.lines, bounds, scene);
1778 }
1779 }
1780
1781 fn paint_lines(
1782 &self,
1783 start_y: f32,
1784 lines: &[HighlightedRangeLine],
1785 bounds: RectF,
1786 scene: &mut Scene,
1787 ) {
1788 if lines.is_empty() {
1789 return;
1790 }
1791
1792 let mut path = PathBuilder::new();
1793 let first_line = lines.first().unwrap();
1794 let last_line = lines.last().unwrap();
1795
1796 let first_top_left = vec2f(first_line.start_x, start_y);
1797 let first_top_right = vec2f(first_line.end_x, start_y);
1798
1799 let curve_height = vec2f(0., self.corner_radius);
1800 let curve_width = |start_x: f32, end_x: f32| {
1801 let max = (end_x - start_x) / 2.;
1802 let width = if max < self.corner_radius {
1803 max
1804 } else {
1805 self.corner_radius
1806 };
1807
1808 vec2f(width, 0.)
1809 };
1810
1811 let top_curve_width = curve_width(first_line.start_x, first_line.end_x);
1812 path.reset(first_top_right - top_curve_width);
1813 path.curve_to(first_top_right + curve_height, first_top_right);
1814
1815 let mut iter = lines.iter().enumerate().peekable();
1816 while let Some((ix, line)) = iter.next() {
1817 let bottom_right = vec2f(line.end_x, start_y + (ix + 1) as f32 * self.line_height);
1818
1819 if let Some((_, next_line)) = iter.peek() {
1820 let next_top_right = vec2f(next_line.end_x, bottom_right.y());
1821
1822 match next_top_right.x().partial_cmp(&bottom_right.x()).unwrap() {
1823 Ordering::Equal => {
1824 path.line_to(bottom_right);
1825 }
1826 Ordering::Less => {
1827 let curve_width = curve_width(next_top_right.x(), bottom_right.x());
1828 path.line_to(bottom_right - curve_height);
1829 if self.corner_radius > 0. {
1830 path.curve_to(bottom_right - curve_width, bottom_right);
1831 }
1832 path.line_to(next_top_right + curve_width);
1833 if self.corner_radius > 0. {
1834 path.curve_to(next_top_right + curve_height, next_top_right);
1835 }
1836 }
1837 Ordering::Greater => {
1838 let curve_width = curve_width(bottom_right.x(), next_top_right.x());
1839 path.line_to(bottom_right - curve_height);
1840 if self.corner_radius > 0. {
1841 path.curve_to(bottom_right + curve_width, bottom_right);
1842 }
1843 path.line_to(next_top_right - curve_width);
1844 if self.corner_radius > 0. {
1845 path.curve_to(next_top_right + curve_height, next_top_right);
1846 }
1847 }
1848 }
1849 } else {
1850 let curve_width = curve_width(line.start_x, line.end_x);
1851 path.line_to(bottom_right - curve_height);
1852 if self.corner_radius > 0. {
1853 path.curve_to(bottom_right - curve_width, bottom_right);
1854 }
1855
1856 let bottom_left = vec2f(line.start_x, bottom_right.y());
1857 path.line_to(bottom_left + curve_width);
1858 if self.corner_radius > 0. {
1859 path.curve_to(bottom_left - curve_height, bottom_left);
1860 }
1861 }
1862 }
1863
1864 if first_line.start_x > last_line.start_x {
1865 let curve_width = curve_width(last_line.start_x, first_line.start_x);
1866 let second_top_left = vec2f(last_line.start_x, start_y + self.line_height);
1867 path.line_to(second_top_left + curve_height);
1868 if self.corner_radius > 0. {
1869 path.curve_to(second_top_left + curve_width, second_top_left);
1870 }
1871 let first_bottom_left = vec2f(first_line.start_x, second_top_left.y());
1872 path.line_to(first_bottom_left - curve_width);
1873 if self.corner_radius > 0. {
1874 path.curve_to(first_bottom_left - curve_height, first_bottom_left);
1875 }
1876 }
1877
1878 path.line_to(first_top_left + curve_height);
1879 if self.corner_radius > 0. {
1880 path.curve_to(first_top_left + top_curve_width, first_top_left);
1881 }
1882 path.line_to(first_top_right - top_curve_width);
1883
1884 scene.push_path(path.build(self.color, Some(bounds)));
1885 }
1886}
1887
1888fn scale_vertical_mouse_autoscroll_delta(delta: f32) -> f32 {
1889 delta.powf(1.5) / 100.0
1890}
1891
1892fn scale_horizontal_mouse_autoscroll_delta(delta: f32) -> f32 {
1893 delta.powf(1.2) / 300.0
1894}
1895
1896#[cfg(test)]
1897mod tests {
1898 use std::sync::Arc;
1899
1900 use super::*;
1901 use crate::{
1902 display_map::{BlockDisposition, BlockProperties},
1903 Editor, MultiBuffer,
1904 };
1905 use settings::Settings;
1906 use util::test::sample_text;
1907
1908 #[gpui::test]
1909 fn test_layout_line_numbers(cx: &mut gpui::MutableAppContext) {
1910 cx.set_global(Settings::test(cx));
1911 let buffer = MultiBuffer::build_simple(&sample_text(6, 6, 'a'), cx);
1912 let (window_id, editor) = cx.add_window(Default::default(), |cx| {
1913 Editor::new(EditorMode::Full, buffer, None, None, cx)
1914 });
1915 let element = EditorElement::new(
1916 editor.downgrade(),
1917 editor.read(cx).style(cx),
1918 CursorShape::Bar,
1919 );
1920
1921 let layouts = editor.update(cx, |editor, cx| {
1922 let snapshot = editor.snapshot(cx);
1923 let mut presenter = cx.build_presenter(window_id, 30.);
1924 let mut layout_cx = presenter.build_layout_context(Vector2F::zero(), false, cx);
1925 element.layout_line_numbers(0..6, &Default::default(), &snapshot, &mut layout_cx)
1926 });
1927 assert_eq!(layouts.len(), 6);
1928 }
1929
1930 #[gpui::test]
1931 fn test_layout_with_placeholder_text_and_blocks(cx: &mut gpui::MutableAppContext) {
1932 cx.set_global(Settings::test(cx));
1933 let buffer = MultiBuffer::build_simple("", cx);
1934 let (window_id, editor) = cx.add_window(Default::default(), |cx| {
1935 Editor::new(EditorMode::Full, buffer, None, None, cx)
1936 });
1937
1938 editor.update(cx, |editor, cx| {
1939 editor.set_placeholder_text("hello", cx);
1940 editor.insert_blocks(
1941 [BlockProperties {
1942 style: BlockStyle::Fixed,
1943 disposition: BlockDisposition::Above,
1944 height: 3,
1945 position: Anchor::min(),
1946 render: Arc::new(|_| Empty::new().boxed()),
1947 }],
1948 cx,
1949 );
1950
1951 // Blur the editor so that it displays placeholder text.
1952 cx.blur();
1953 });
1954
1955 let mut element = EditorElement::new(
1956 editor.downgrade(),
1957 editor.read(cx).style(cx),
1958 CursorShape::Bar,
1959 );
1960
1961 let mut scene = Scene::new(1.0);
1962 let mut presenter = cx.build_presenter(window_id, 30.);
1963 let mut layout_cx = presenter.build_layout_context(Vector2F::zero(), false, cx);
1964 let (size, mut state) = element.layout(
1965 SizeConstraint::new(vec2f(500., 500.), vec2f(500., 500.)),
1966 &mut layout_cx,
1967 );
1968
1969 assert_eq!(state.line_layouts.len(), 4);
1970 assert_eq!(
1971 state
1972 .line_number_layouts
1973 .iter()
1974 .map(Option::is_some)
1975 .collect::<Vec<_>>(),
1976 &[false, false, false, true]
1977 );
1978
1979 // Don't panic.
1980 let bounds = RectF::new(Default::default(), size);
1981 let mut paint_cx = presenter.build_paint_context(&mut scene, bounds.size(), cx);
1982 element.paint(bounds, bounds, &mut state, &mut paint_cx);
1983 }
1984}