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::{
9 HoverAt, HOVER_POPOVER_GAP, MIN_POPOVER_CHARACTER_WIDTH, MIN_POPOVER_LINE_HEIGHT,
10 },
11 link_go_to_definition::{
12 CmdShiftChanged, GoToFetchedDefinition, GoToFetchedTypeDefinition, UpdateGoToDefinitionLink,
13 },
14 mouse_context_menu::DeployMouseContextMenu,
15 EditorStyle,
16};
17use clock::ReplicaId;
18use collections::{BTreeMap, HashMap};
19use gpui::{
20 color::Color,
21 elements::*,
22 fonts::{HighlightStyle, Underline},
23 geometry::{
24 rect::RectF,
25 vector::{vec2f, Vector2F},
26 PathBuilder,
27 },
28 json::{self, ToJson},
29 platform::CursorStyle,
30 text_layout::{self, Line, RunStyle, TextLayoutCache},
31 AppContext, Axis, Border, CursorRegion, Element, ElementBox, Event, EventContext,
32 LayoutContext, ModifiersChangedEvent, MouseButton, MouseButtonEvent, MouseMovedEvent,
33 MouseRegion, MutableAppContext, PaintContext, Quad, Scene, SizeConstraint, ViewContext,
34 WeakViewHandle,
35};
36use json::json;
37use language::git::{DiffHunk, DiffHunkStatus};
38use language::{Bias, DiagnosticSeverity, OffsetUtf16, Selection};
39use project::ProjectPath;
40use settings::Settings;
41use smallvec::SmallVec;
42use std::{
43 cmp::{self, Ordering},
44 fmt::Write,
45 iter,
46 ops::Range,
47 sync::Arc,
48};
49
50struct SelectionLayout {
51 head: DisplayPoint,
52 range: Range<DisplayPoint>,
53}
54
55impl SelectionLayout {
56 fn new<T: ToPoint + ToDisplayPoint + Clone>(
57 selection: Selection<T>,
58 line_mode: bool,
59 map: &DisplaySnapshot,
60 ) -> Self {
61 if line_mode {
62 let selection = selection.map(|p| p.to_point(&map.buffer_snapshot));
63 let point_range = map.expand_to_line(selection.range());
64 Self {
65 head: selection.head().to_display_point(map),
66 range: point_range.start.to_display_point(map)
67 ..point_range.end.to_display_point(map),
68 }
69 } else {
70 let selection = selection.map(|p| p.to_display_point(map));
71 Self {
72 head: selection.head(),
73 range: selection.range(),
74 }
75 }
76 }
77}
78
79#[derive(Clone)]
80pub struct EditorElement {
81 view: WeakViewHandle<Editor>,
82 style: Arc<EditorStyle>,
83 cursor_shape: CursorShape,
84}
85
86impl EditorElement {
87 pub fn new(
88 view: WeakViewHandle<Editor>,
89 style: EditorStyle,
90 cursor_shape: CursorShape,
91 ) -> Self {
92 Self {
93 view,
94 style: Arc::new(style),
95 cursor_shape,
96 }
97 }
98
99 fn view<'a>(&self, cx: &'a AppContext) -> &'a Editor {
100 self.view.upgrade(cx).unwrap().read(cx)
101 }
102
103 fn update_view<F, T>(&self, cx: &mut MutableAppContext, f: F) -> T
104 where
105 F: FnOnce(&mut Editor, &mut ViewContext<Editor>) -> T,
106 {
107 self.view.upgrade(cx).unwrap().update(cx, f)
108 }
109
110 fn snapshot(&self, cx: &mut MutableAppContext) -> EditorSnapshot {
111 self.update_view(cx, |view, cx| view.snapshot(cx))
112 }
113
114 fn attach_mouse_handlers(
115 view: &WeakViewHandle<Editor>,
116 position_map: &Arc<PositionMap>,
117 visible_bounds: RectF,
118 text_bounds: RectF,
119 gutter_bounds: RectF,
120 bounds: RectF,
121 cx: &mut PaintContext,
122 ) {
123 enum EditorElementMouseHandlers {}
124 cx.scene.push_mouse_region(
125 MouseRegion::new::<EditorElementMouseHandlers>(view.id(), view.id(), visible_bounds)
126 .on_down(MouseButton::Left, {
127 let position_map = position_map.clone();
128 move |e, cx| {
129 if !Self::mouse_down(
130 e.platform_event,
131 position_map.as_ref(),
132 text_bounds,
133 gutter_bounds,
134 cx,
135 ) {
136 cx.propogate_event();
137 }
138 }
139 })
140 .on_down(MouseButton::Right, {
141 let position_map = position_map.clone();
142 move |e, cx| {
143 if !Self::mouse_right_down(
144 e.position,
145 position_map.as_ref(),
146 text_bounds,
147 cx,
148 ) {
149 cx.propogate_event();
150 }
151 }
152 })
153 .on_up(MouseButton::Left, {
154 let view = view.clone();
155 let position_map = position_map.clone();
156 move |e, cx| {
157 if !Self::mouse_up(
158 view.clone(),
159 e.position,
160 e.cmd,
161 e.shift,
162 position_map.as_ref(),
163 text_bounds,
164 cx,
165 ) {
166 cx.propogate_event()
167 }
168 }
169 })
170 .on_drag(MouseButton::Left, {
171 let view = view.clone();
172 let position_map = position_map.clone();
173 move |e, cx| {
174 if !Self::mouse_dragged(
175 view.clone(),
176 e.platform_event,
177 position_map.as_ref(),
178 text_bounds,
179 cx,
180 ) {
181 cx.propogate_event()
182 }
183 }
184 })
185 .on_move({
186 let position_map = position_map.clone();
187 move |e, cx| {
188 if !Self::mouse_moved(e.platform_event, &position_map, text_bounds, cx) {
189 cx.propogate_event()
190 }
191 }
192 })
193 .on_scroll({
194 let position_map = position_map.clone();
195 move |e, cx| {
196 if !Self::scroll(e.position, e.delta, e.precise, &position_map, bounds, cx)
197 {
198 cx.propogate_event()
199 }
200 }
201 }),
202 );
203 }
204
205 fn mouse_down(
206 MouseButtonEvent {
207 position,
208 ctrl,
209 alt,
210 shift,
211 cmd,
212 mut click_count,
213 ..
214 }: MouseButtonEvent,
215 position_map: &PositionMap,
216 text_bounds: RectF,
217 gutter_bounds: RectF,
218 cx: &mut EventContext,
219 ) -> bool {
220 if gutter_bounds.contains_point(position) {
221 click_count = 3; // Simulate triple-click when clicking the gutter to select lines
222 } else if !text_bounds.contains_point(position) {
223 return false;
224 }
225
226 let (position, target_position) = position_map.point_for_position(text_bounds, position);
227
228 if shift && alt {
229 cx.dispatch_action(Select(SelectPhase::BeginColumnar {
230 position,
231 goal_column: target_position.column(),
232 }));
233 } else if shift && !ctrl && !alt && !cmd {
234 cx.dispatch_action(Select(SelectPhase::Extend {
235 position,
236 click_count,
237 }));
238 } else {
239 cx.dispatch_action(Select(SelectPhase::Begin {
240 position,
241 add: alt,
242 click_count,
243 }));
244 }
245
246 true
247 }
248
249 fn mouse_right_down(
250 position: Vector2F,
251 position_map: &PositionMap,
252 text_bounds: RectF,
253 cx: &mut EventContext,
254 ) -> bool {
255 if !text_bounds.contains_point(position) {
256 return false;
257 }
258
259 let (point, _) = position_map.point_for_position(text_bounds, position);
260
261 cx.dispatch_action(DeployMouseContextMenu { position, point });
262 true
263 }
264
265 fn mouse_up(
266 view: WeakViewHandle<Editor>,
267 position: Vector2F,
268 cmd: bool,
269 shift: bool,
270 position_map: &PositionMap,
271 text_bounds: RectF,
272 cx: &mut EventContext,
273 ) -> bool {
274 let view = view.upgrade(cx.app).unwrap().read(cx.app);
275 let end_selection = view.has_pending_selection();
276 let pending_nonempty_selections = view.has_pending_nonempty_selection();
277
278 if end_selection {
279 cx.dispatch_action(Select(SelectPhase::End));
280 }
281
282 if !pending_nonempty_selections && cmd && text_bounds.contains_point(position) {
283 let (point, target_point) = position_map.point_for_position(text_bounds, position);
284
285 if point == target_point {
286 if shift {
287 cx.dispatch_action(GoToFetchedTypeDefinition { point });
288 } else {
289 cx.dispatch_action(GoToFetchedDefinition { point });
290 }
291
292 return true;
293 }
294 }
295
296 end_selection
297 }
298
299 fn mouse_dragged(
300 view: WeakViewHandle<Editor>,
301 MouseMovedEvent {
302 cmd,
303 shift,
304 position,
305 ..
306 }: MouseMovedEvent,
307 position_map: &PositionMap,
308 text_bounds: RectF,
309 cx: &mut EventContext,
310 ) -> bool {
311 // This will be handled more correctly once https://github.com/zed-industries/zed/issues/1218 is completed
312 // Don't trigger hover popover if mouse is hovering over context menu
313 let point = if text_bounds.contains_point(position) {
314 let (point, target_point) = position_map.point_for_position(text_bounds, position);
315 if point == target_point {
316 Some(point)
317 } else {
318 None
319 }
320 } else {
321 None
322 };
323
324 cx.dispatch_action(UpdateGoToDefinitionLink {
325 point,
326 cmd_held: cmd,
327 shift_held: shift,
328 });
329
330 let view = view.upgrade(cx.app).unwrap().read(cx.app);
331 if view.has_pending_selection() {
332 let mut scroll_delta = Vector2F::zero();
333
334 let vertical_margin = position_map.line_height.min(text_bounds.height() / 3.0);
335 let top = text_bounds.origin_y() + vertical_margin;
336 let bottom = text_bounds.lower_left().y() - vertical_margin;
337 if position.y() < top {
338 scroll_delta.set_y(-scale_vertical_mouse_autoscroll_delta(top - position.y()))
339 }
340 if position.y() > bottom {
341 scroll_delta.set_y(scale_vertical_mouse_autoscroll_delta(position.y() - bottom))
342 }
343
344 let horizontal_margin = position_map.line_height.min(text_bounds.width() / 3.0);
345 let left = text_bounds.origin_x() + horizontal_margin;
346 let right = text_bounds.upper_right().x() - horizontal_margin;
347 if position.x() < left {
348 scroll_delta.set_x(-scale_horizontal_mouse_autoscroll_delta(
349 left - position.x(),
350 ))
351 }
352 if position.x() > right {
353 scroll_delta.set_x(scale_horizontal_mouse_autoscroll_delta(
354 position.x() - right,
355 ))
356 }
357
358 let (position, target_position) =
359 position_map.point_for_position(text_bounds, position);
360
361 cx.dispatch_action(Select(SelectPhase::Update {
362 position,
363 goal_column: target_position.column(),
364 scroll_position: (position_map.snapshot.scroll_position() + scroll_delta)
365 .clamp(Vector2F::zero(), position_map.scroll_max),
366 }));
367
368 cx.dispatch_action(HoverAt { point });
369 true
370 } else {
371 cx.dispatch_action(HoverAt { point });
372 false
373 }
374 }
375
376 fn mouse_moved(
377 MouseMovedEvent {
378 cmd,
379 shift,
380 position,
381 ..
382 }: MouseMovedEvent,
383 position_map: &PositionMap,
384 text_bounds: RectF,
385 cx: &mut EventContext,
386 ) -> bool {
387 // This will be handled more correctly once https://github.com/zed-industries/zed/issues/1218 is completed
388 // Don't trigger hover popover if mouse is hovering over context menu
389 let point = if text_bounds.contains_point(position) {
390 let (point, target_point) = position_map.point_for_position(text_bounds, position);
391 if point == target_point {
392 Some(point)
393 } else {
394 None
395 }
396 } else {
397 None
398 };
399
400 cx.dispatch_action(UpdateGoToDefinitionLink {
401 point,
402 cmd_held: cmd,
403 shift_held: shift,
404 });
405
406 cx.dispatch_action(HoverAt { point });
407 true
408 }
409
410 fn modifiers_changed(&self, event: ModifiersChangedEvent, cx: &mut EventContext) -> bool {
411 cx.dispatch_action(CmdShiftChanged {
412 cmd_down: event.cmd,
413 shift_down: event.shift,
414 });
415 false
416 }
417
418 fn scroll(
419 position: Vector2F,
420 mut delta: Vector2F,
421 precise: bool,
422 position_map: &PositionMap,
423 bounds: RectF,
424 cx: &mut EventContext,
425 ) -> bool {
426 if !bounds.contains_point(position) {
427 return false;
428 }
429
430 let max_glyph_width = position_map.em_width;
431 if !precise {
432 delta *= vec2f(max_glyph_width, position_map.line_height);
433 }
434
435 let scroll_position = position_map.snapshot.scroll_position();
436 let x = (scroll_position.x() * max_glyph_width - delta.x()) / max_glyph_width;
437 let y =
438 (scroll_position.y() * position_map.line_height - delta.y()) / position_map.line_height;
439 let scroll_position = vec2f(x, y).clamp(Vector2F::zero(), position_map.scroll_max);
440
441 cx.dispatch_action(Scroll(scroll_position));
442
443 true
444 }
445
446 fn paint_background(
447 &self,
448 gutter_bounds: RectF,
449 text_bounds: RectF,
450 layout: &LayoutState,
451 cx: &mut PaintContext,
452 ) {
453 let bounds = gutter_bounds.union_rect(text_bounds);
454 let scroll_top =
455 layout.position_map.snapshot.scroll_position().y() * layout.position_map.line_height;
456 let editor = self.view(cx.app);
457 cx.scene.push_quad(Quad {
458 bounds: gutter_bounds,
459 background: Some(self.style.gutter_background),
460 border: Border::new(0., Color::transparent_black()),
461 corner_radius: 0.,
462 });
463 cx.scene.push_quad(Quad {
464 bounds: text_bounds,
465 background: Some(self.style.background),
466 border: Border::new(0., Color::transparent_black()),
467 corner_radius: 0.,
468 });
469
470 if let EditorMode::Full = editor.mode {
471 let mut active_rows = layout.active_rows.iter().peekable();
472 while let Some((start_row, contains_non_empty_selection)) = active_rows.next() {
473 let mut end_row = *start_row;
474 while active_rows.peek().map_or(false, |r| {
475 *r.0 == end_row + 1 && r.1 == contains_non_empty_selection
476 }) {
477 active_rows.next().unwrap();
478 end_row += 1;
479 }
480
481 if !contains_non_empty_selection {
482 let origin = vec2f(
483 bounds.origin_x(),
484 bounds.origin_y() + (layout.position_map.line_height * *start_row as f32)
485 - scroll_top,
486 );
487 let size = vec2f(
488 bounds.width(),
489 layout.position_map.line_height * (end_row - start_row + 1) as f32,
490 );
491 cx.scene.push_quad(Quad {
492 bounds: RectF::new(origin, size),
493 background: Some(self.style.active_line_background),
494 border: Border::default(),
495 corner_radius: 0.,
496 });
497 }
498 }
499
500 if let Some(highlighted_rows) = &layout.highlighted_rows {
501 let origin = vec2f(
502 bounds.origin_x(),
503 bounds.origin_y()
504 + (layout.position_map.line_height * highlighted_rows.start as f32)
505 - scroll_top,
506 );
507 let size = vec2f(
508 bounds.width(),
509 layout.position_map.line_height * highlighted_rows.len() as f32,
510 );
511 cx.scene.push_quad(Quad {
512 bounds: RectF::new(origin, size),
513 background: Some(self.style.highlighted_line_background),
514 border: Border::default(),
515 corner_radius: 0.,
516 });
517 }
518 }
519 }
520
521 fn paint_gutter(
522 &mut self,
523 bounds: RectF,
524 visible_bounds: RectF,
525 layout: &mut LayoutState,
526 cx: &mut PaintContext,
527 ) {
528 let scroll_top =
529 layout.position_map.snapshot.scroll_position().y() * layout.position_map.line_height;
530 for (ix, line) in layout.line_number_layouts.iter().enumerate() {
531 if let Some(line) = line {
532 let line_origin = bounds.origin()
533 + vec2f(
534 bounds.width() - line.width() - layout.gutter_padding,
535 ix as f32 * layout.position_map.line_height
536 - (scroll_top % layout.position_map.line_height),
537 );
538 line.paint(
539 line_origin,
540 visible_bounds,
541 layout.position_map.line_height,
542 cx,
543 );
544 }
545 }
546
547 println!("painting from hunks: {:#?}\n", layout.diff_hunks);
548 for hunk in &layout.diff_hunks {
549 let color = match hunk.status() {
550 DiffHunkStatus::Added => Color::green(),
551 DiffHunkStatus::Modified => Color::blue(),
552 _ => continue,
553 };
554
555 let start_row = hunk.buffer_range.start;
556 let end_row = hunk.buffer_range.end;
557
558 let start_y = start_row as f32 * layout.line_height - scroll_top;
559 let end_y = end_row as f32 * layout.line_height + layout.line_height - scroll_top;
560
561 let width = 0.22 * layout.line_height;
562 let highlight_origin = bounds.origin() + vec2f(-width, start_y);
563 let highlight_size = vec2f(width * 2., end_y - start_y);
564 let highlight_bounds = RectF::new(highlight_origin, highlight_size);
565
566 cx.scene.push_quad(Quad {
567 bounds: highlight_bounds,
568 background: Some(color),
569 border: Border::new(0., Color::transparent_black()),
570 corner_radius: 0.2 * layout.line_height,
571 });
572 }
573
574 if let Some((row, indicator)) = layout.code_actions_indicator.as_mut() {
575 let mut x = bounds.width() - layout.gutter_padding;
576 let mut y = *row as f32 * layout.position_map.line_height - scroll_top;
577 x += ((layout.gutter_padding + layout.gutter_margin) - indicator.size().x()) / 2.;
578 y += (layout.position_map.line_height - indicator.size().y()) / 2.;
579 indicator.paint(bounds.origin() + vec2f(x, y), visible_bounds, cx);
580 }
581 }
582
583 fn paint_text(
584 &mut self,
585 bounds: RectF,
586 visible_bounds: RectF,
587 layout: &mut LayoutState,
588 cx: &mut PaintContext,
589 ) {
590 let view = self.view(cx.app);
591 let style = &self.style;
592 let local_replica_id = view.replica_id(cx);
593 let scroll_position = layout.position_map.snapshot.scroll_position();
594 let start_row = scroll_position.y() as u32;
595 let scroll_top = scroll_position.y() * layout.position_map.line_height;
596 let end_row =
597 ((scroll_top + bounds.height()) / layout.position_map.line_height).ceil() as u32 + 1; // Add 1 to ensure selections bleed off screen
598 let max_glyph_width = layout.position_map.em_width;
599 let scroll_left = scroll_position.x() * max_glyph_width;
600 let content_origin = bounds.origin() + vec2f(layout.gutter_margin, 0.);
601
602 cx.scene.push_layer(Some(bounds));
603
604 cx.scene.push_cursor_region(CursorRegion {
605 bounds,
606 style: if !view.link_go_to_definition_state.definitions.is_empty() {
607 CursorStyle::PointingHand
608 } else {
609 CursorStyle::IBeam
610 },
611 });
612
613 for (range, color) in &layout.highlighted_ranges {
614 self.paint_highlighted_range(
615 range.clone(),
616 start_row,
617 end_row,
618 *color,
619 0.,
620 0.15 * layout.position_map.line_height,
621 layout,
622 content_origin,
623 scroll_top,
624 scroll_left,
625 bounds,
626 cx,
627 );
628 }
629
630 let mut cursors = SmallVec::<[Cursor; 32]>::new();
631 for (replica_id, selections) in &layout.selections {
632 let selection_style = style.replica_selection_style(*replica_id);
633 let corner_radius = 0.15 * layout.position_map.line_height;
634
635 for selection in selections {
636 self.paint_highlighted_range(
637 selection.range.clone(),
638 start_row,
639 end_row,
640 selection_style.selection,
641 corner_radius,
642 corner_radius * 2.,
643 layout,
644 content_origin,
645 scroll_top,
646 scroll_left,
647 bounds,
648 cx,
649 );
650
651 if view.show_local_cursors() || *replica_id != local_replica_id {
652 let cursor_position = selection.head;
653 if (start_row..end_row).contains(&cursor_position.row()) {
654 let cursor_row_layout = &layout.position_map.line_layouts
655 [(cursor_position.row() - start_row) as usize];
656 let cursor_column = cursor_position.column() as usize;
657
658 let cursor_character_x = cursor_row_layout.x_for_index(cursor_column);
659 let mut block_width =
660 cursor_row_layout.x_for_index(cursor_column + 1) - cursor_character_x;
661 if block_width == 0.0 {
662 block_width = layout.position_map.em_width;
663 }
664 let block_text = if let CursorShape::Block = self.cursor_shape {
665 layout
666 .position_map
667 .snapshot
668 .chars_at(cursor_position)
669 .next()
670 .and_then(|character| {
671 let font_id =
672 cursor_row_layout.font_for_index(cursor_column)?;
673 let text = character.to_string();
674
675 Some(cx.text_layout_cache.layout_str(
676 &text,
677 cursor_row_layout.font_size(),
678 &[(
679 text.len(),
680 RunStyle {
681 font_id,
682 color: style.background,
683 underline: Default::default(),
684 },
685 )],
686 ))
687 })
688 } else {
689 None
690 };
691
692 let x = cursor_character_x - scroll_left;
693 let y = cursor_position.row() as f32 * layout.position_map.line_height
694 - scroll_top;
695 cursors.push(Cursor {
696 color: selection_style.cursor,
697 block_width,
698 origin: vec2f(x, y),
699 line_height: layout.position_map.line_height,
700 shape: self.cursor_shape,
701 block_text,
702 });
703 }
704 }
705 }
706 }
707
708 if let Some(visible_text_bounds) = bounds.intersection(visible_bounds) {
709 // Draw glyphs
710 for (ix, line) in layout.position_map.line_layouts.iter().enumerate() {
711 let row = start_row + ix as u32;
712 line.paint(
713 content_origin
714 + vec2f(
715 -scroll_left,
716 row as f32 * layout.position_map.line_height - scroll_top,
717 ),
718 visible_text_bounds,
719 layout.position_map.line_height,
720 cx,
721 );
722 }
723 }
724
725 cx.scene.push_layer(Some(bounds));
726 for cursor in cursors {
727 cursor.paint(content_origin, cx);
728 }
729 cx.scene.pop_layer();
730
731 if let Some((position, context_menu)) = layout.context_menu.as_mut() {
732 cx.scene.push_stacking_context(None);
733 let cursor_row_layout =
734 &layout.position_map.line_layouts[(position.row() - start_row) as usize];
735 let x = cursor_row_layout.x_for_index(position.column() as usize) - scroll_left;
736 let y = (position.row() + 1) as f32 * layout.position_map.line_height - scroll_top;
737 let mut list_origin = content_origin + vec2f(x, y);
738 let list_width = context_menu.size().x();
739 let list_height = context_menu.size().y();
740
741 // Snap the right edge of the list to the right edge of the window if
742 // its horizontal bounds overflow.
743 if list_origin.x() + list_width > cx.window_size.x() {
744 list_origin.set_x((cx.window_size.x() - list_width).max(0.));
745 }
746
747 if list_origin.y() + list_height > bounds.max_y() {
748 list_origin.set_y(list_origin.y() - layout.position_map.line_height - list_height);
749 }
750
751 context_menu.paint(
752 list_origin,
753 RectF::from_points(Vector2F::zero(), vec2f(f32::MAX, f32::MAX)), // Let content bleed outside of editor
754 cx,
755 );
756
757 cx.scene.pop_stacking_context();
758 }
759
760 if let Some((position, hover_popovers)) = layout.hover_popovers.as_mut() {
761 cx.scene.push_stacking_context(None);
762
763 // This is safe because we check on layout whether the required row is available
764 let hovered_row_layout =
765 &layout.position_map.line_layouts[(position.row() - start_row) as usize];
766
767 // Minimum required size: Take the first popover, and add 1.5 times the minimum popover
768 // height. This is the size we will use to decide whether to render popovers above or below
769 // the hovered line.
770 let first_size = hover_popovers[0].size();
771 let height_to_reserve = first_size.y()
772 + 1.5 * MIN_POPOVER_LINE_HEIGHT as f32 * layout.position_map.line_height;
773
774 // Compute Hovered Point
775 let x = hovered_row_layout.x_for_index(position.column() as usize) - scroll_left;
776 let y = position.row() as f32 * layout.position_map.line_height - scroll_top;
777 let hovered_point = content_origin + vec2f(x, y);
778
779 if hovered_point.y() - height_to_reserve > 0.0 {
780 // There is enough space above. Render popovers above the hovered point
781 let mut current_y = hovered_point.y();
782 for hover_popover in hover_popovers {
783 let size = hover_popover.size();
784 let mut popover_origin = vec2f(hovered_point.x(), current_y - size.y());
785
786 let x_out_of_bounds = bounds.max_x() - (popover_origin.x() + size.x());
787 if x_out_of_bounds < 0.0 {
788 popover_origin.set_x(popover_origin.x() + x_out_of_bounds);
789 }
790
791 hover_popover.paint(
792 popover_origin,
793 RectF::from_points(Vector2F::zero(), vec2f(f32::MAX, f32::MAX)), // Let content bleed outside of editor
794 cx,
795 );
796
797 current_y = popover_origin.y() - HOVER_POPOVER_GAP;
798 }
799 } else {
800 // There is not enough space above. Render popovers below the hovered point
801 let mut current_y = hovered_point.y() + layout.position_map.line_height;
802 for hover_popover in hover_popovers {
803 let size = hover_popover.size();
804 let mut popover_origin = vec2f(hovered_point.x(), current_y);
805
806 let x_out_of_bounds = bounds.max_x() - (popover_origin.x() + size.x());
807 if x_out_of_bounds < 0.0 {
808 popover_origin.set_x(popover_origin.x() + x_out_of_bounds);
809 }
810
811 hover_popover.paint(
812 popover_origin,
813 RectF::from_points(Vector2F::zero(), vec2f(f32::MAX, f32::MAX)), // Let content bleed outside of editor
814 cx,
815 );
816
817 current_y = popover_origin.y() + size.y() + HOVER_POPOVER_GAP;
818 }
819 }
820
821 cx.scene.pop_stacking_context();
822 }
823
824 cx.scene.pop_layer();
825 }
826
827 #[allow(clippy::too_many_arguments)]
828 fn paint_highlighted_range(
829 &self,
830 range: Range<DisplayPoint>,
831 start_row: u32,
832 end_row: u32,
833 color: Color,
834 corner_radius: f32,
835 line_end_overshoot: f32,
836 layout: &LayoutState,
837 content_origin: Vector2F,
838 scroll_top: f32,
839 scroll_left: f32,
840 bounds: RectF,
841 cx: &mut PaintContext,
842 ) {
843 if range.start != range.end {
844 let row_range = if range.end.column() == 0 {
845 cmp::max(range.start.row(), start_row)..cmp::min(range.end.row(), end_row)
846 } else {
847 cmp::max(range.start.row(), start_row)..cmp::min(range.end.row() + 1, end_row)
848 };
849
850 let highlighted_range = HighlightedRange {
851 color,
852 line_height: layout.position_map.line_height,
853 corner_radius,
854 start_y: content_origin.y()
855 + row_range.start as f32 * layout.position_map.line_height
856 - scroll_top,
857 lines: row_range
858 .into_iter()
859 .map(|row| {
860 let line_layout =
861 &layout.position_map.line_layouts[(row - start_row) as usize];
862 HighlightedRangeLine {
863 start_x: if row == range.start.row() {
864 content_origin.x()
865 + line_layout.x_for_index(range.start.column() as usize)
866 - scroll_left
867 } else {
868 content_origin.x() - scroll_left
869 },
870 end_x: if row == range.end.row() {
871 content_origin.x()
872 + line_layout.x_for_index(range.end.column() as usize)
873 - scroll_left
874 } else {
875 content_origin.x() + line_layout.width() + line_end_overshoot
876 - scroll_left
877 },
878 }
879 })
880 .collect(),
881 };
882
883 highlighted_range.paint(bounds, cx.scene);
884 }
885 }
886
887 fn paint_blocks(
888 &mut self,
889 bounds: RectF,
890 visible_bounds: RectF,
891 layout: &mut LayoutState,
892 cx: &mut PaintContext,
893 ) {
894 let scroll_position = layout.position_map.snapshot.scroll_position();
895 let scroll_left = scroll_position.x() * layout.position_map.em_width;
896 let scroll_top = scroll_position.y() * layout.position_map.line_height;
897
898 for block in &mut layout.blocks {
899 let mut origin = bounds.origin()
900 + vec2f(
901 0.,
902 block.row as f32 * layout.position_map.line_height - scroll_top,
903 );
904 if !matches!(block.style, BlockStyle::Sticky) {
905 origin += vec2f(-scroll_left, 0.);
906 }
907 block.element.paint(origin, visible_bounds, cx);
908 }
909 }
910
911 fn max_line_number_width(&self, snapshot: &EditorSnapshot, cx: &LayoutContext) -> f32 {
912 let digit_count = (snapshot.max_buffer_row() as f32).log10().floor() as usize + 1;
913 let style = &self.style;
914
915 cx.text_layout_cache
916 .layout_str(
917 "1".repeat(digit_count).as_str(),
918 style.text.font_size,
919 &[(
920 digit_count,
921 RunStyle {
922 font_id: style.text.font_id,
923 color: Color::black(),
924 underline: Default::default(),
925 },
926 )],
927 )
928 .width()
929 }
930
931 fn layout_line_numbers(
932 &self,
933 rows: Range<u32>,
934 active_rows: &BTreeMap<u32, bool>,
935 snapshot: &EditorSnapshot,
936 cx: &LayoutContext,
937 ) -> Vec<Option<text_layout::Line>> {
938 let style = &self.style;
939 let include_line_numbers = snapshot.mode == EditorMode::Full;
940 let mut line_number_layouts = Vec::with_capacity(rows.len());
941 let mut line_number = String::new();
942 for (ix, row) in snapshot
943 .buffer_rows(rows.start)
944 .take((rows.end - rows.start) as usize)
945 .enumerate()
946 {
947 let display_row = rows.start + ix as u32;
948 let color = if active_rows.contains_key(&display_row) {
949 style.line_number_active
950 } else {
951 style.line_number
952 };
953 if let Some(buffer_row) = row {
954 if include_line_numbers {
955 line_number.clear();
956 write!(&mut line_number, "{}", buffer_row + 1).unwrap();
957 line_number_layouts.push(Some(cx.text_layout_cache.layout_str(
958 &line_number,
959 style.text.font_size,
960 &[(
961 line_number.len(),
962 RunStyle {
963 font_id: style.text.font_id,
964 color,
965 underline: Default::default(),
966 },
967 )],
968 )));
969 }
970 } else {
971 line_number_layouts.push(None);
972 }
973 }
974
975 line_number_layouts
976 }
977
978 fn layout_lines(
979 &mut self,
980 rows: Range<u32>,
981 snapshot: &EditorSnapshot,
982 cx: &LayoutContext,
983 ) -> Vec<text_layout::Line> {
984 if rows.start >= rows.end {
985 return Vec::new();
986 }
987
988 // When the editor is empty and unfocused, then show the placeholder.
989 if snapshot.is_empty() && !snapshot.is_focused() {
990 let placeholder_style = self
991 .style
992 .placeholder_text
993 .as_ref()
994 .unwrap_or(&self.style.text);
995 let placeholder_text = snapshot.placeholder_text();
996 let placeholder_lines = placeholder_text
997 .as_ref()
998 .map_or("", AsRef::as_ref)
999 .split('\n')
1000 .skip(rows.start as usize)
1001 .chain(iter::repeat(""))
1002 .take(rows.len());
1003 placeholder_lines
1004 .map(|line| {
1005 cx.text_layout_cache.layout_str(
1006 line,
1007 placeholder_style.font_size,
1008 &[(
1009 line.len(),
1010 RunStyle {
1011 font_id: placeholder_style.font_id,
1012 color: placeholder_style.color,
1013 underline: Default::default(),
1014 },
1015 )],
1016 )
1017 })
1018 .collect()
1019 } else {
1020 let style = &self.style;
1021 let chunks = snapshot.chunks(rows.clone(), true).map(|chunk| {
1022 let mut highlight_style = chunk
1023 .syntax_highlight_id
1024 .and_then(|id| id.style(&style.syntax));
1025
1026 if let Some(chunk_highlight) = chunk.highlight_style {
1027 if let Some(highlight_style) = highlight_style.as_mut() {
1028 highlight_style.highlight(chunk_highlight);
1029 } else {
1030 highlight_style = Some(chunk_highlight);
1031 }
1032 }
1033
1034 let mut diagnostic_highlight = HighlightStyle::default();
1035
1036 if chunk.is_unnecessary {
1037 diagnostic_highlight.fade_out = Some(style.unnecessary_code_fade);
1038 }
1039
1040 if let Some(severity) = chunk.diagnostic_severity {
1041 // Omit underlines for HINT/INFO diagnostics on 'unnecessary' code.
1042 if severity <= DiagnosticSeverity::WARNING || !chunk.is_unnecessary {
1043 let diagnostic_style = super::diagnostic_style(severity, true, style);
1044 diagnostic_highlight.underline = Some(Underline {
1045 color: Some(diagnostic_style.message.text.color),
1046 thickness: 1.0.into(),
1047 squiggly: true,
1048 });
1049 }
1050 }
1051
1052 if let Some(highlight_style) = highlight_style.as_mut() {
1053 highlight_style.highlight(diagnostic_highlight);
1054 } else {
1055 highlight_style = Some(diagnostic_highlight);
1056 }
1057
1058 (chunk.text, highlight_style)
1059 });
1060 layout_highlighted_chunks(
1061 chunks,
1062 &style.text,
1063 cx.text_layout_cache,
1064 cx.font_cache,
1065 MAX_LINE_LEN,
1066 rows.len() as usize,
1067 )
1068 }
1069 }
1070
1071 #[allow(clippy::too_many_arguments)]
1072 fn layout_blocks(
1073 &mut self,
1074 rows: Range<u32>,
1075 snapshot: &EditorSnapshot,
1076 editor_width: f32,
1077 scroll_width: f32,
1078 gutter_padding: f32,
1079 gutter_width: f32,
1080 em_width: f32,
1081 text_x: f32,
1082 line_height: f32,
1083 style: &EditorStyle,
1084 line_layouts: &[text_layout::Line],
1085 cx: &mut LayoutContext,
1086 ) -> (f32, Vec<BlockLayout>) {
1087 let editor = if let Some(editor) = self.view.upgrade(cx) {
1088 editor
1089 } else {
1090 return Default::default();
1091 };
1092
1093 let tooltip_style = cx.global::<Settings>().theme.tooltip.clone();
1094 let scroll_x = snapshot.scroll_position.x();
1095 let (fixed_blocks, non_fixed_blocks) = snapshot
1096 .blocks_in_range(rows.clone())
1097 .partition::<Vec<_>, _>(|(_, block)| match block {
1098 TransformBlock::ExcerptHeader { .. } => false,
1099 TransformBlock::Custom(block) => block.style() == BlockStyle::Fixed,
1100 });
1101 let mut render_block = |block: &TransformBlock, width: f32| {
1102 let mut element = match block {
1103 TransformBlock::Custom(block) => {
1104 let align_to = block
1105 .position()
1106 .to_point(&snapshot.buffer_snapshot)
1107 .to_display_point(snapshot);
1108 let anchor_x = text_x
1109 + if rows.contains(&align_to.row()) {
1110 line_layouts[(align_to.row() - rows.start) as usize]
1111 .x_for_index(align_to.column() as usize)
1112 } else {
1113 layout_line(align_to.row(), snapshot, style, cx.text_layout_cache)
1114 .x_for_index(align_to.column() as usize)
1115 };
1116
1117 cx.render(&editor, |_, cx| {
1118 block.render(&mut BlockContext {
1119 cx,
1120 anchor_x,
1121 gutter_padding,
1122 line_height,
1123 scroll_x,
1124 gutter_width,
1125 em_width,
1126 })
1127 })
1128 }
1129 TransformBlock::ExcerptHeader {
1130 key,
1131 buffer,
1132 range,
1133 starts_new_buffer,
1134 ..
1135 } => {
1136 let jump_icon = project::File::from_dyn(buffer.file()).map(|file| {
1137 let jump_position = range
1138 .primary
1139 .as_ref()
1140 .map_or(range.context.start, |primary| primary.start);
1141 let jump_action = crate::Jump {
1142 path: ProjectPath {
1143 worktree_id: file.worktree_id(cx),
1144 path: file.path.clone(),
1145 },
1146 position: language::ToPoint::to_point(&jump_position, buffer),
1147 anchor: jump_position,
1148 };
1149
1150 enum JumpIcon {}
1151 cx.render(&editor, |_, cx| {
1152 MouseEventHandler::<JumpIcon>::new(*key, cx, |state, _| {
1153 let style = style.jump_icon.style_for(state, false);
1154 Svg::new("icons/arrow_up_right_8.svg")
1155 .with_color(style.color)
1156 .constrained()
1157 .with_width(style.icon_width)
1158 .aligned()
1159 .contained()
1160 .with_style(style.container)
1161 .constrained()
1162 .with_width(style.button_width)
1163 .with_height(style.button_width)
1164 .boxed()
1165 })
1166 .with_cursor_style(CursorStyle::PointingHand)
1167 .on_click(MouseButton::Left, move |_, cx| {
1168 cx.dispatch_action(jump_action.clone())
1169 })
1170 .with_tooltip::<JumpIcon, _>(
1171 *key,
1172 "Jump to Buffer".to_string(),
1173 Some(Box::new(crate::OpenExcerpts)),
1174 tooltip_style.clone(),
1175 cx,
1176 )
1177 .aligned()
1178 .flex_float()
1179 .boxed()
1180 })
1181 });
1182
1183 if *starts_new_buffer {
1184 let style = &self.style.diagnostic_path_header;
1185 let font_size =
1186 (style.text_scale_factor * self.style.text.font_size).round();
1187
1188 let mut filename = None;
1189 let mut parent_path = None;
1190 if let Some(file) = buffer.file() {
1191 let path = file.path();
1192 filename = path.file_name().map(|f| f.to_string_lossy().to_string());
1193 parent_path =
1194 path.parent().map(|p| p.to_string_lossy().to_string() + "/");
1195 }
1196
1197 Flex::row()
1198 .with_child(
1199 Label::new(
1200 filename.unwrap_or_else(|| "untitled".to_string()),
1201 style.filename.text.clone().with_font_size(font_size),
1202 )
1203 .contained()
1204 .with_style(style.filename.container)
1205 .aligned()
1206 .boxed(),
1207 )
1208 .with_children(parent_path.map(|path| {
1209 Label::new(path, style.path.text.clone().with_font_size(font_size))
1210 .contained()
1211 .with_style(style.path.container)
1212 .aligned()
1213 .boxed()
1214 }))
1215 .with_children(jump_icon)
1216 .contained()
1217 .with_style(style.container)
1218 .with_padding_left(gutter_padding)
1219 .with_padding_right(gutter_padding)
1220 .expanded()
1221 .named("path header block")
1222 } else {
1223 let text_style = self.style.text.clone();
1224 Flex::row()
1225 .with_child(Label::new("…".to_string(), text_style).boxed())
1226 .with_children(jump_icon)
1227 .contained()
1228 .with_padding_left(gutter_padding)
1229 .with_padding_right(gutter_padding)
1230 .expanded()
1231 .named("collapsed context")
1232 }
1233 }
1234 };
1235
1236 element.layout(
1237 SizeConstraint {
1238 min: Vector2F::zero(),
1239 max: vec2f(width, block.height() as f32 * line_height),
1240 },
1241 cx,
1242 );
1243 element
1244 };
1245
1246 let mut fixed_block_max_width = 0f32;
1247 let mut blocks = Vec::new();
1248 for (row, block) in fixed_blocks {
1249 let element = render_block(block, f32::INFINITY);
1250 fixed_block_max_width = fixed_block_max_width.max(element.size().x() + em_width);
1251 blocks.push(BlockLayout {
1252 row,
1253 element,
1254 style: BlockStyle::Fixed,
1255 });
1256 }
1257 for (row, block) in non_fixed_blocks {
1258 let style = match block {
1259 TransformBlock::Custom(block) => block.style(),
1260 TransformBlock::ExcerptHeader { .. } => BlockStyle::Sticky,
1261 };
1262 let width = match style {
1263 BlockStyle::Sticky => editor_width,
1264 BlockStyle::Flex => editor_width
1265 .max(fixed_block_max_width)
1266 .max(gutter_width + scroll_width),
1267 BlockStyle::Fixed => unreachable!(),
1268 };
1269 let element = render_block(block, width);
1270 blocks.push(BlockLayout {
1271 row,
1272 element,
1273 style,
1274 });
1275 }
1276 (
1277 scroll_width.max(fixed_block_max_width - gutter_width),
1278 blocks,
1279 )
1280 }
1281}
1282
1283impl Element for EditorElement {
1284 type LayoutState = LayoutState;
1285 type PaintState = ();
1286
1287 fn layout(
1288 &mut self,
1289 constraint: SizeConstraint,
1290 cx: &mut LayoutContext,
1291 ) -> (Vector2F, Self::LayoutState) {
1292 let mut size = constraint.max;
1293 if size.x().is_infinite() {
1294 unimplemented!("we don't yet handle an infinite width constraint on buffer elements");
1295 }
1296
1297 let snapshot = self.snapshot(cx.app);
1298 let style = self.style.clone();
1299 let line_height = style.text.line_height(cx.font_cache);
1300
1301 let gutter_padding;
1302 let gutter_width;
1303 let gutter_margin;
1304 if snapshot.mode == EditorMode::Full {
1305 gutter_padding = style.text.em_width(cx.font_cache) * style.gutter_padding_factor;
1306 gutter_width = self.max_line_number_width(&snapshot, cx) + gutter_padding * 2.0;
1307 gutter_margin = -style.text.descent(cx.font_cache);
1308 } else {
1309 gutter_padding = 0.0;
1310 gutter_width = 0.0;
1311 gutter_margin = 0.0;
1312 };
1313
1314 let text_width = size.x() - gutter_width;
1315 let em_width = style.text.em_width(cx.font_cache);
1316 let em_advance = style.text.em_advance(cx.font_cache);
1317 let overscroll = vec2f(em_width, 0.);
1318 let snapshot = self.update_view(cx.app, |view, cx| {
1319 let wrap_width = match view.soft_wrap_mode(cx) {
1320 SoftWrap::None => Some((MAX_LINE_LEN / 2) as f32 * em_advance),
1321 SoftWrap::EditorWidth => {
1322 Some(text_width - gutter_margin - overscroll.x() - em_width)
1323 }
1324 SoftWrap::Column(column) => Some(column as f32 * em_advance),
1325 };
1326
1327 if view.set_wrap_width(wrap_width, cx) {
1328 view.snapshot(cx)
1329 } else {
1330 snapshot
1331 }
1332 });
1333
1334 let scroll_height = (snapshot.max_point().row() + 1) as f32 * line_height;
1335 if let EditorMode::AutoHeight { max_lines } = snapshot.mode {
1336 size.set_y(
1337 scroll_height
1338 .min(constraint.max_along(Axis::Vertical))
1339 .max(constraint.min_along(Axis::Vertical))
1340 .min(line_height * max_lines as f32),
1341 )
1342 } else if let EditorMode::SingleLine = snapshot.mode {
1343 size.set_y(
1344 line_height
1345 .min(constraint.max_along(Axis::Vertical))
1346 .max(constraint.min_along(Axis::Vertical)),
1347 )
1348 } else if size.y().is_infinite() {
1349 size.set_y(scroll_height);
1350 }
1351 let gutter_size = vec2f(gutter_width, size.y());
1352 let text_size = vec2f(text_width, size.y());
1353
1354 let (autoscroll_horizontally, mut snapshot) = self.update_view(cx.app, |view, cx| {
1355 let autoscroll_horizontally = view.autoscroll_vertically(size.y(), line_height, cx);
1356 let snapshot = view.snapshot(cx);
1357 (autoscroll_horizontally, snapshot)
1358 });
1359
1360 let scroll_position = snapshot.scroll_position();
1361 // The scroll position is a fractional point, the whole number of which represents
1362 // the top of the window in terms of display rows.
1363 let start_row = scroll_position.y() as u32;
1364 let scroll_top = scroll_position.y() * line_height;
1365
1366 // Add 1 to ensure selections bleed off screen
1367 let end_row = 1 + cmp::min(
1368 ((scroll_top + size.y()) / line_height).ceil() as u32,
1369 snapshot.max_point().row(),
1370 );
1371
1372 let start_anchor = if start_row == 0 {
1373 Anchor::min()
1374 } else {
1375 snapshot
1376 .buffer_snapshot
1377 .anchor_before(DisplayPoint::new(start_row, 0).to_offset(&snapshot, Bias::Left))
1378 };
1379 let end_anchor = if end_row > snapshot.max_point().row() {
1380 Anchor::max()
1381 } else {
1382 snapshot
1383 .buffer_snapshot
1384 .anchor_before(DisplayPoint::new(end_row, 0).to_offset(&snapshot, Bias::Right))
1385 };
1386
1387 let mut selections: Vec<(ReplicaId, Vec<SelectionLayout>)> = Vec::new();
1388 let mut active_rows = BTreeMap::new();
1389 let mut highlighted_rows = None;
1390 let mut highlighted_ranges = Vec::new();
1391 self.update_view(cx.app, |view, cx| {
1392 let display_map = view.display_map.update(cx, |map, cx| map.snapshot(cx));
1393
1394 highlighted_rows = view.highlighted_rows();
1395 let theme = cx.global::<Settings>().theme.as_ref();
1396 highlighted_ranges = view.background_highlights_in_range(
1397 start_anchor.clone()..end_anchor.clone(),
1398 &display_map,
1399 theme,
1400 );
1401
1402 let mut remote_selections = HashMap::default();
1403 for (replica_id, line_mode, selection) in display_map
1404 .buffer_snapshot
1405 .remote_selections_in_range(&(start_anchor.clone()..end_anchor.clone()))
1406 {
1407 // The local selections match the leader's selections.
1408 if Some(replica_id) == view.leader_replica_id {
1409 continue;
1410 }
1411 remote_selections
1412 .entry(replica_id)
1413 .or_insert(Vec::new())
1414 .push(SelectionLayout::new(selection, line_mode, &display_map));
1415 }
1416 selections.extend(remote_selections);
1417
1418 if view.show_local_selections {
1419 let mut local_selections = view
1420 .selections
1421 .disjoint_in_range(start_anchor..end_anchor, cx);
1422 local_selections.extend(view.selections.pending(cx));
1423 for selection in &local_selections {
1424 let is_empty = selection.start == selection.end;
1425 let selection_start = snapshot.prev_line_boundary(selection.start).1;
1426 let selection_end = snapshot.next_line_boundary(selection.end).1;
1427 for row in cmp::max(selection_start.row(), start_row)
1428 ..=cmp::min(selection_end.row(), end_row)
1429 {
1430 let contains_non_empty_selection =
1431 active_rows.entry(row).or_insert(!is_empty);
1432 *contains_non_empty_selection |= !is_empty;
1433 }
1434 }
1435
1436 // Render the local selections in the leader's color when following.
1437 let local_replica_id = view
1438 .leader_replica_id
1439 .unwrap_or_else(|| view.replica_id(cx));
1440
1441 selections.push((
1442 local_replica_id,
1443 local_selections
1444 .into_iter()
1445 .map(|selection| {
1446 SelectionLayout::new(selection, view.selections.line_mode, &display_map)
1447 })
1448 .collect(),
1449 ));
1450 }
1451 });
1452
1453 let line_number_layouts =
1454 self.layout_line_numbers(start_row..end_row, &active_rows, &snapshot, cx);
1455
1456 let diff_hunks = snapshot
1457 .buffer_snapshot
1458 .diff_hunks_in_range(start_row..end_row)
1459 .collect();
1460
1461 let mut max_visible_line_width = 0.0;
1462 let line_layouts = self.layout_lines(start_row..end_row, &snapshot, cx);
1463 for line in &line_layouts {
1464 if line.width() > max_visible_line_width {
1465 max_visible_line_width = line.width();
1466 }
1467 }
1468
1469 let style = self.style.clone();
1470 let longest_line_width = layout_line(
1471 snapshot.longest_row(),
1472 &snapshot,
1473 &style,
1474 cx.text_layout_cache,
1475 )
1476 .width();
1477 let scroll_width = longest_line_width.max(max_visible_line_width) + overscroll.x();
1478 let em_width = style.text.em_width(cx.font_cache);
1479 let (scroll_width, blocks) = self.layout_blocks(
1480 start_row..end_row,
1481 &snapshot,
1482 size.x(),
1483 scroll_width,
1484 gutter_padding,
1485 gutter_width,
1486 em_width,
1487 gutter_width + gutter_margin,
1488 line_height,
1489 &style,
1490 &line_layouts,
1491 cx,
1492 );
1493
1494 let max_row = snapshot.max_point().row();
1495 let scroll_max = vec2f(
1496 ((scroll_width - text_size.x()) / em_width).max(0.0),
1497 max_row.saturating_sub(1) as f32,
1498 );
1499
1500 self.update_view(cx.app, |view, cx| {
1501 let clamped = view.clamp_scroll_left(scroll_max.x());
1502
1503 let autoscrolled = if autoscroll_horizontally {
1504 view.autoscroll_horizontally(
1505 start_row,
1506 text_size.x(),
1507 scroll_width,
1508 em_width,
1509 &line_layouts,
1510 cx,
1511 )
1512 } else {
1513 false
1514 };
1515
1516 if clamped || autoscrolled {
1517 snapshot = view.snapshot(cx);
1518 }
1519 });
1520
1521 let mut context_menu = None;
1522 let mut code_actions_indicator = None;
1523 let mut hover = None;
1524 cx.render(&self.view.upgrade(cx).unwrap(), |view, cx| {
1525 let newest_selection_head = view
1526 .selections
1527 .newest::<usize>(cx)
1528 .head()
1529 .to_display_point(&snapshot);
1530
1531 let style = view.style(cx);
1532 if (start_row..end_row).contains(&newest_selection_head.row()) {
1533 if view.context_menu_visible() {
1534 context_menu =
1535 view.render_context_menu(newest_selection_head, style.clone(), cx);
1536 }
1537
1538 code_actions_indicator = view
1539 .render_code_actions_indicator(&style, cx)
1540 .map(|indicator| (newest_selection_head.row(), indicator));
1541 }
1542
1543 let visible_rows = start_row..start_row + line_layouts.len() as u32;
1544 hover = view.hover_state.render(&snapshot, &style, visible_rows, cx);
1545 });
1546
1547 if let Some((_, context_menu)) = context_menu.as_mut() {
1548 context_menu.layout(
1549 SizeConstraint {
1550 min: Vector2F::zero(),
1551 max: vec2f(
1552 cx.window_size.x() * 0.7,
1553 (12. * line_height).min((size.y() - line_height) / 2.),
1554 ),
1555 },
1556 cx,
1557 );
1558 }
1559
1560 if let Some((_, indicator)) = code_actions_indicator.as_mut() {
1561 indicator.layout(
1562 SizeConstraint::strict_along(
1563 Axis::Vertical,
1564 line_height * style.code_actions.vertical_scale,
1565 ),
1566 cx,
1567 );
1568 }
1569
1570 if let Some((_, hover_popovers)) = hover.as_mut() {
1571 for hover_popover in hover_popovers.iter_mut() {
1572 hover_popover.layout(
1573 SizeConstraint {
1574 min: Vector2F::zero(),
1575 max: vec2f(
1576 (120. * em_width) // Default size
1577 .min(size.x() / 2.) // Shrink to half of the editor width
1578 .max(MIN_POPOVER_CHARACTER_WIDTH * em_width), // Apply minimum width of 20 characters
1579 (16. * line_height) // Default size
1580 .min(size.y() / 2.) // Shrink to half of the editor height
1581 .max(MIN_POPOVER_LINE_HEIGHT * line_height), // Apply minimum height of 4 lines
1582 ),
1583 },
1584 cx,
1585 );
1586 }
1587 }
1588
1589 (
1590 size,
1591 LayoutState {
1592 position_map: Arc::new(PositionMap {
1593 size,
1594 scroll_max,
1595 line_layouts,
1596 line_height,
1597 em_width,
1598 em_advance,
1599 snapshot,
1600 }),
1601 gutter_size,
1602 gutter_padding,
1603 text_size,
1604 gutter_margin,
1605 active_rows,
1606 highlighted_rows,
1607 highlighted_ranges,
1608 line_number_layouts,
1609 diff_hunks,
1610 blocks,
1611 selections,
1612 context_menu,
1613 code_actions_indicator,
1614 hover_popovers: hover,
1615 },
1616 )
1617 }
1618
1619 fn paint(
1620 &mut self,
1621 bounds: RectF,
1622 visible_bounds: RectF,
1623 layout: &mut Self::LayoutState,
1624 cx: &mut PaintContext,
1625 ) -> Self::PaintState {
1626 cx.scene.push_layer(Some(bounds));
1627
1628 let gutter_bounds = RectF::new(bounds.origin(), layout.gutter_size);
1629 let text_bounds = RectF::new(
1630 bounds.origin() + vec2f(layout.gutter_size.x(), 0.0),
1631 layout.text_size,
1632 );
1633
1634 Self::attach_mouse_handlers(
1635 &self.view,
1636 &layout.position_map,
1637 visible_bounds,
1638 text_bounds,
1639 gutter_bounds,
1640 bounds,
1641 cx,
1642 );
1643
1644 self.paint_background(gutter_bounds, text_bounds, layout, cx);
1645 if layout.gutter_size.x() > 0. {
1646 self.paint_gutter(gutter_bounds, visible_bounds, layout, cx);
1647 }
1648 self.paint_text(text_bounds, visible_bounds, layout, cx);
1649
1650 if !layout.blocks.is_empty() {
1651 cx.scene.push_layer(Some(bounds));
1652 self.paint_blocks(bounds, visible_bounds, layout, cx);
1653 cx.scene.pop_layer();
1654 }
1655
1656 cx.scene.pop_layer();
1657 }
1658
1659 fn dispatch_event(
1660 &mut self,
1661 event: &Event,
1662 _: RectF,
1663 _: RectF,
1664 _: &mut LayoutState,
1665 _: &mut (),
1666 cx: &mut EventContext,
1667 ) -> bool {
1668 if let Event::ModifiersChanged(event) = event {
1669 self.modifiers_changed(*event, cx);
1670 }
1671
1672 false
1673 }
1674
1675 fn rect_for_text_range(
1676 &self,
1677 range_utf16: Range<usize>,
1678 bounds: RectF,
1679 _: RectF,
1680 layout: &Self::LayoutState,
1681 _: &Self::PaintState,
1682 _: &gpui::MeasurementContext,
1683 ) -> Option<RectF> {
1684 let text_bounds = RectF::new(
1685 bounds.origin() + vec2f(layout.gutter_size.x(), 0.0),
1686 layout.text_size,
1687 );
1688 let content_origin = text_bounds.origin() + vec2f(layout.gutter_margin, 0.);
1689 let scroll_position = layout.position_map.snapshot.scroll_position();
1690 let start_row = scroll_position.y() as u32;
1691 let scroll_top = scroll_position.y() * layout.position_map.line_height;
1692 let scroll_left = scroll_position.x() * layout.position_map.em_width;
1693
1694 let range_start = OffsetUtf16(range_utf16.start)
1695 .to_display_point(&layout.position_map.snapshot.display_snapshot);
1696 if range_start.row() < start_row {
1697 return None;
1698 }
1699
1700 let line = layout
1701 .position_map
1702 .line_layouts
1703 .get((range_start.row() - start_row) as usize)?;
1704 let range_start_x = line.x_for_index(range_start.column() as usize);
1705 let range_start_y = range_start.row() as f32 * layout.position_map.line_height;
1706 Some(RectF::new(
1707 content_origin
1708 + vec2f(
1709 range_start_x,
1710 range_start_y + layout.position_map.line_height,
1711 )
1712 - vec2f(scroll_left, scroll_top),
1713 vec2f(
1714 layout.position_map.em_width,
1715 layout.position_map.line_height,
1716 ),
1717 ))
1718 }
1719
1720 fn debug(
1721 &self,
1722 bounds: RectF,
1723 _: &Self::LayoutState,
1724 _: &Self::PaintState,
1725 _: &gpui::DebugContext,
1726 ) -> json::Value {
1727 json!({
1728 "type": "BufferElement",
1729 "bounds": bounds.to_json()
1730 })
1731 }
1732}
1733
1734pub struct LayoutState {
1735 position_map: Arc<PositionMap>,
1736 gutter_size: Vector2F,
1737 gutter_padding: f32,
1738 gutter_margin: f32,
1739 text_size: Vector2F,
1740 active_rows: BTreeMap<u32, bool>,
1741 highlighted_rows: Option<Range<u32>>,
1742 line_number_layouts: Vec<Option<text_layout::Line>>,
1743 blocks: Vec<BlockLayout>,
1744 highlighted_ranges: Vec<(Range<DisplayPoint>, Color)>,
1745 selections: Vec<(ReplicaId, Vec<SelectionLayout>)>,
1746 context_menu: Option<(DisplayPoint, ElementBox)>,
1747 diff_hunks: Vec<DiffHunk<u32>>,
1748 code_actions_indicator: Option<(u32, ElementBox)>,
1749 hover_popovers: Option<(DisplayPoint, Vec<ElementBox>)>,
1750}
1751
1752pub struct PositionMap {
1753 size: Vector2F,
1754 line_height: f32,
1755 scroll_max: Vector2F,
1756 em_width: f32,
1757 em_advance: f32,
1758 line_layouts: Vec<text_layout::Line>,
1759 snapshot: EditorSnapshot,
1760}
1761
1762impl PositionMap {
1763 /// Returns two display points:
1764 /// 1. The nearest *valid* position in the editor
1765 /// 2. An unclipped, potentially *invalid* position that maps directly to
1766 /// the given pixel position.
1767 fn point_for_position(
1768 &self,
1769 text_bounds: RectF,
1770 position: Vector2F,
1771 ) -> (DisplayPoint, DisplayPoint) {
1772 let scroll_position = self.snapshot.scroll_position();
1773 let position = position - text_bounds.origin();
1774 let y = position.y().max(0.0).min(self.size.y());
1775 let x = position.x() + (scroll_position.x() * self.em_width);
1776 let row = (y / self.line_height + scroll_position.y()) as u32;
1777 let (column, x_overshoot) = if let Some(line) = self
1778 .line_layouts
1779 .get(row as usize - scroll_position.y() as usize)
1780 {
1781 if let Some(ix) = line.index_for_x(x) {
1782 (ix as u32, 0.0)
1783 } else {
1784 (line.len() as u32, 0f32.max(x - line.width()))
1785 }
1786 } else {
1787 (0, x)
1788 };
1789
1790 let mut target_point = DisplayPoint::new(row, column);
1791 let point = self.snapshot.clip_point(target_point, Bias::Left);
1792 *target_point.column_mut() += (x_overshoot / self.em_advance) as u32;
1793
1794 (point, target_point)
1795 }
1796}
1797
1798struct BlockLayout {
1799 row: u32,
1800 element: ElementBox,
1801 style: BlockStyle,
1802}
1803
1804fn layout_line(
1805 row: u32,
1806 snapshot: &EditorSnapshot,
1807 style: &EditorStyle,
1808 layout_cache: &TextLayoutCache,
1809) -> text_layout::Line {
1810 let mut line = snapshot.line(row);
1811
1812 if line.len() > MAX_LINE_LEN {
1813 let mut len = MAX_LINE_LEN;
1814 while !line.is_char_boundary(len) {
1815 len -= 1;
1816 }
1817
1818 line.truncate(len);
1819 }
1820
1821 layout_cache.layout_str(
1822 &line,
1823 style.text.font_size,
1824 &[(
1825 snapshot.line_len(row) as usize,
1826 RunStyle {
1827 font_id: style.text.font_id,
1828 color: Color::black(),
1829 underline: Default::default(),
1830 },
1831 )],
1832 )
1833}
1834
1835#[derive(Copy, Clone, PartialEq, Eq, Debug)]
1836pub enum CursorShape {
1837 Bar,
1838 Block,
1839 Underscore,
1840 Hollow,
1841}
1842
1843impl Default for CursorShape {
1844 fn default() -> Self {
1845 CursorShape::Bar
1846 }
1847}
1848
1849#[derive(Debug)]
1850pub struct Cursor {
1851 origin: Vector2F,
1852 block_width: f32,
1853 line_height: f32,
1854 color: Color,
1855 shape: CursorShape,
1856 block_text: Option<Line>,
1857}
1858
1859impl Cursor {
1860 pub fn new(
1861 origin: Vector2F,
1862 block_width: f32,
1863 line_height: f32,
1864 color: Color,
1865 shape: CursorShape,
1866 block_text: Option<Line>,
1867 ) -> Cursor {
1868 Cursor {
1869 origin,
1870 block_width,
1871 line_height,
1872 color,
1873 shape,
1874 block_text,
1875 }
1876 }
1877
1878 pub fn bounding_rect(&self, origin: Vector2F) -> RectF {
1879 RectF::new(
1880 self.origin + origin,
1881 vec2f(self.block_width, self.line_height),
1882 )
1883 }
1884
1885 pub fn paint(&self, origin: Vector2F, cx: &mut PaintContext) {
1886 let bounds = match self.shape {
1887 CursorShape::Bar => RectF::new(self.origin + origin, vec2f(2.0, self.line_height)),
1888 CursorShape::Block | CursorShape::Hollow => RectF::new(
1889 self.origin + origin,
1890 vec2f(self.block_width, self.line_height),
1891 ),
1892 CursorShape::Underscore => RectF::new(
1893 self.origin + origin + Vector2F::new(0.0, self.line_height - 2.0),
1894 vec2f(self.block_width, 2.0),
1895 ),
1896 };
1897
1898 //Draw background or border quad
1899 if matches!(self.shape, CursorShape::Hollow) {
1900 cx.scene.push_quad(Quad {
1901 bounds,
1902 background: None,
1903 border: Border::all(1., self.color),
1904 corner_radius: 0.,
1905 });
1906 } else {
1907 cx.scene.push_quad(Quad {
1908 bounds,
1909 background: Some(self.color),
1910 border: Default::default(),
1911 corner_radius: 0.,
1912 });
1913 }
1914
1915 if let Some(block_text) = &self.block_text {
1916 block_text.paint(self.origin + origin, bounds, self.line_height, cx);
1917 }
1918 }
1919
1920 pub fn shape(&self) -> CursorShape {
1921 self.shape
1922 }
1923}
1924
1925#[derive(Debug)]
1926pub struct HighlightedRange {
1927 pub start_y: f32,
1928 pub line_height: f32,
1929 pub lines: Vec<HighlightedRangeLine>,
1930 pub color: Color,
1931 pub corner_radius: f32,
1932}
1933
1934#[derive(Debug)]
1935pub struct HighlightedRangeLine {
1936 pub start_x: f32,
1937 pub end_x: f32,
1938}
1939
1940impl HighlightedRange {
1941 pub fn paint(&self, bounds: RectF, scene: &mut Scene) {
1942 if self.lines.len() >= 2 && self.lines[0].start_x > self.lines[1].end_x {
1943 self.paint_lines(self.start_y, &self.lines[0..1], bounds, scene);
1944 self.paint_lines(
1945 self.start_y + self.line_height,
1946 &self.lines[1..],
1947 bounds,
1948 scene,
1949 );
1950 } else {
1951 self.paint_lines(self.start_y, &self.lines, bounds, scene);
1952 }
1953 }
1954
1955 fn paint_lines(
1956 &self,
1957 start_y: f32,
1958 lines: &[HighlightedRangeLine],
1959 bounds: RectF,
1960 scene: &mut Scene,
1961 ) {
1962 if lines.is_empty() {
1963 return;
1964 }
1965
1966 let mut path = PathBuilder::new();
1967 let first_line = lines.first().unwrap();
1968 let last_line = lines.last().unwrap();
1969
1970 let first_top_left = vec2f(first_line.start_x, start_y);
1971 let first_top_right = vec2f(first_line.end_x, start_y);
1972
1973 let curve_height = vec2f(0., self.corner_radius);
1974 let curve_width = |start_x: f32, end_x: f32| {
1975 let max = (end_x - start_x) / 2.;
1976 let width = if max < self.corner_radius {
1977 max
1978 } else {
1979 self.corner_radius
1980 };
1981
1982 vec2f(width, 0.)
1983 };
1984
1985 let top_curve_width = curve_width(first_line.start_x, first_line.end_x);
1986 path.reset(first_top_right - top_curve_width);
1987 path.curve_to(first_top_right + curve_height, first_top_right);
1988
1989 let mut iter = lines.iter().enumerate().peekable();
1990 while let Some((ix, line)) = iter.next() {
1991 let bottom_right = vec2f(line.end_x, start_y + (ix + 1) as f32 * self.line_height);
1992
1993 if let Some((_, next_line)) = iter.peek() {
1994 let next_top_right = vec2f(next_line.end_x, bottom_right.y());
1995
1996 match next_top_right.x().partial_cmp(&bottom_right.x()).unwrap() {
1997 Ordering::Equal => {
1998 path.line_to(bottom_right);
1999 }
2000 Ordering::Less => {
2001 let curve_width = curve_width(next_top_right.x(), bottom_right.x());
2002 path.line_to(bottom_right - curve_height);
2003 if self.corner_radius > 0. {
2004 path.curve_to(bottom_right - curve_width, bottom_right);
2005 }
2006 path.line_to(next_top_right + curve_width);
2007 if self.corner_radius > 0. {
2008 path.curve_to(next_top_right + curve_height, next_top_right);
2009 }
2010 }
2011 Ordering::Greater => {
2012 let curve_width = curve_width(bottom_right.x(), next_top_right.x());
2013 path.line_to(bottom_right - curve_height);
2014 if self.corner_radius > 0. {
2015 path.curve_to(bottom_right + curve_width, bottom_right);
2016 }
2017 path.line_to(next_top_right - curve_width);
2018 if self.corner_radius > 0. {
2019 path.curve_to(next_top_right + curve_height, next_top_right);
2020 }
2021 }
2022 }
2023 } else {
2024 let curve_width = curve_width(line.start_x, line.end_x);
2025 path.line_to(bottom_right - curve_height);
2026 if self.corner_radius > 0. {
2027 path.curve_to(bottom_right - curve_width, bottom_right);
2028 }
2029
2030 let bottom_left = vec2f(line.start_x, bottom_right.y());
2031 path.line_to(bottom_left + curve_width);
2032 if self.corner_radius > 0. {
2033 path.curve_to(bottom_left - curve_height, bottom_left);
2034 }
2035 }
2036 }
2037
2038 if first_line.start_x > last_line.start_x {
2039 let curve_width = curve_width(last_line.start_x, first_line.start_x);
2040 let second_top_left = vec2f(last_line.start_x, start_y + self.line_height);
2041 path.line_to(second_top_left + curve_height);
2042 if self.corner_radius > 0. {
2043 path.curve_to(second_top_left + curve_width, second_top_left);
2044 }
2045 let first_bottom_left = vec2f(first_line.start_x, second_top_left.y());
2046 path.line_to(first_bottom_left - curve_width);
2047 if self.corner_radius > 0. {
2048 path.curve_to(first_bottom_left - curve_height, first_bottom_left);
2049 }
2050 }
2051
2052 path.line_to(first_top_left + curve_height);
2053 if self.corner_radius > 0. {
2054 path.curve_to(first_top_left + top_curve_width, first_top_left);
2055 }
2056 path.line_to(first_top_right - top_curve_width);
2057
2058 scene.push_path(path.build(self.color, Some(bounds)));
2059 }
2060}
2061
2062pub fn scale_vertical_mouse_autoscroll_delta(delta: f32) -> f32 {
2063 delta.powf(1.5) / 100.0
2064}
2065
2066fn scale_horizontal_mouse_autoscroll_delta(delta: f32) -> f32 {
2067 delta.powf(1.2) / 300.0
2068}
2069
2070#[cfg(test)]
2071mod tests {
2072 use std::sync::Arc;
2073
2074 use super::*;
2075 use crate::{
2076 display_map::{BlockDisposition, BlockProperties},
2077 Editor, MultiBuffer,
2078 };
2079 use settings::Settings;
2080 use util::test::sample_text;
2081
2082 #[gpui::test]
2083 fn test_layout_line_numbers(cx: &mut gpui::MutableAppContext) {
2084 cx.set_global(Settings::test(cx));
2085 let buffer = MultiBuffer::build_simple(&sample_text(6, 6, 'a'), cx);
2086 let (window_id, editor) = cx.add_window(Default::default(), |cx| {
2087 Editor::new(EditorMode::Full, buffer, None, None, cx)
2088 });
2089 let element = EditorElement::new(
2090 editor.downgrade(),
2091 editor.read(cx).style(cx),
2092 CursorShape::Bar,
2093 );
2094
2095 let layouts = editor.update(cx, |editor, cx| {
2096 let snapshot = editor.snapshot(cx);
2097 let mut presenter = cx.build_presenter(window_id, 30., Default::default());
2098 let layout_cx = presenter.build_layout_context(Vector2F::zero(), false, cx);
2099 element.layout_line_numbers(0..6, &Default::default(), &snapshot, &layout_cx)
2100 });
2101 assert_eq!(layouts.len(), 6);
2102 }
2103
2104 #[gpui::test]
2105 fn test_layout_with_placeholder_text_and_blocks(cx: &mut gpui::MutableAppContext) {
2106 cx.set_global(Settings::test(cx));
2107 let buffer = MultiBuffer::build_simple("", cx);
2108 let (window_id, editor) = cx.add_window(Default::default(), |cx| {
2109 Editor::new(EditorMode::Full, buffer, None, None, cx)
2110 });
2111
2112 editor.update(cx, |editor, cx| {
2113 editor.set_placeholder_text("hello", cx);
2114 editor.insert_blocks(
2115 [BlockProperties {
2116 style: BlockStyle::Fixed,
2117 disposition: BlockDisposition::Above,
2118 height: 3,
2119 position: Anchor::min(),
2120 render: Arc::new(|_| Empty::new().boxed()),
2121 }],
2122 cx,
2123 );
2124
2125 // Blur the editor so that it displays placeholder text.
2126 cx.blur();
2127 });
2128
2129 let mut element = EditorElement::new(
2130 editor.downgrade(),
2131 editor.read(cx).style(cx),
2132 CursorShape::Bar,
2133 );
2134
2135 let mut scene = Scene::new(1.0);
2136 let mut presenter = cx.build_presenter(window_id, 30., Default::default());
2137 let mut layout_cx = presenter.build_layout_context(Vector2F::zero(), false, cx);
2138 let (size, mut state) = element.layout(
2139 SizeConstraint::new(vec2f(500., 500.), vec2f(500., 500.)),
2140 &mut layout_cx,
2141 );
2142
2143 assert_eq!(state.position_map.line_layouts.len(), 4);
2144 assert_eq!(
2145 state
2146 .line_number_layouts
2147 .iter()
2148 .map(Option::is_some)
2149 .collect::<Vec<_>>(),
2150 &[false, false, false, true]
2151 );
2152
2153 // Don't panic.
2154 let bounds = RectF::new(Default::default(), size);
2155 let mut paint_cx = presenter.build_paint_context(&mut scene, bounds.size(), cx);
2156 element.paint(bounds, bounds, &mut state, &mut paint_cx);
2157 }
2158}