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::{
10 CmdShiftChanged, GoToFetchedDefinition, GoToFetchedTypeDefinition, UpdateGoToDefinitionLink,
11 },
12 mouse_context_menu::DeployMouseContextMenu,
13 EditorStyle,
14};
15use clock::ReplicaId;
16use collections::{BTreeMap, HashMap};
17use gpui::{
18 color::Color,
19 elements::*,
20 fonts::{HighlightStyle, Underline},
21 geometry::{
22 rect::RectF,
23 vector::{vec2f, Vector2F},
24 PathBuilder,
25 },
26 json::{self, ToJson},
27 platform::CursorStyle,
28 text_layout::{self, Line, RunStyle, TextLayoutCache},
29 AppContext, Axis, Border, CursorRegion, Element, ElementBox, Event, EventContext,
30 LayoutContext, ModifiersChangedEvent, MouseButton, MouseButtonEvent, MouseMovedEvent,
31 MutableAppContext, PaintContext, Quad, Scene, ScrollWheelEvent, SizeConstraint, ViewContext,
32 WeakViewHandle,
33};
34use json::json;
35use language::{Bias, DiagnosticSeverity, OffsetUtf16, Selection};
36use project::ProjectPath;
37use settings::Settings;
38use smallvec::SmallVec;
39use std::{
40 cmp::{self, Ordering},
41 fmt::Write,
42 iter,
43 ops::Range,
44};
45
46const MIN_POPOVER_CHARACTER_WIDTH: f32 = 20.;
47const MIN_POPOVER_LINE_HEIGHT: f32 = 4.;
48const HOVER_POPOVER_GAP: f32 = 10.;
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
79pub struct EditorElement {
80 view: WeakViewHandle<Editor>,
81 style: EditorStyle,
82 cursor_shape: CursorShape,
83}
84
85impl EditorElement {
86 pub fn new(
87 view: WeakViewHandle<Editor>,
88 style: EditorStyle,
89 cursor_shape: CursorShape,
90 ) -> Self {
91 Self {
92 view,
93 style,
94 cursor_shape,
95 }
96 }
97
98 fn view<'a>(&self, cx: &'a AppContext) -> &'a Editor {
99 self.view.upgrade(cx).unwrap().read(cx)
100 }
101
102 fn update_view<F, T>(&self, cx: &mut MutableAppContext, f: F) -> T
103 where
104 F: FnOnce(&mut Editor, &mut ViewContext<Editor>) -> T,
105 {
106 self.view.upgrade(cx).unwrap().update(cx, f)
107 }
108
109 fn snapshot(&self, cx: &mut MutableAppContext) -> EditorSnapshot {
110 self.update_view(cx, |view, cx| view.snapshot(cx))
111 }
112
113 fn mouse_down(
114 &self,
115 MouseButtonEvent {
116 position,
117 ctrl,
118 alt,
119 shift,
120 cmd,
121 mut click_count,
122 ..
123 }: MouseButtonEvent,
124 layout: &mut LayoutState,
125 paint: &mut PaintState,
126 cx: &mut EventContext,
127 ) -> bool {
128 if paint.gutter_bounds.contains_point(position) {
129 click_count = 3; // Simulate triple-click when clicking the gutter to select lines
130 } else if !paint.text_bounds.contains_point(position) {
131 return false;
132 }
133
134 let snapshot = self.snapshot(cx.app);
135 let (position, target_position) = paint.point_for_position(&snapshot, layout, position);
136
137 if shift && alt {
138 cx.dispatch_action(Select(SelectPhase::BeginColumnar {
139 position,
140 goal_column: target_position.column(),
141 }));
142 } else if shift && !ctrl && !alt && !cmd {
143 cx.dispatch_action(Select(SelectPhase::Extend {
144 position,
145 click_count,
146 }));
147 } else {
148 cx.dispatch_action(Select(SelectPhase::Begin {
149 position,
150 add: alt,
151 click_count,
152 }));
153 }
154
155 true
156 }
157
158 fn mouse_right_down(
159 &self,
160 position: Vector2F,
161 layout: &mut LayoutState,
162 paint: &mut PaintState,
163 cx: &mut EventContext,
164 ) -> bool {
165 if !paint.text_bounds.contains_point(position) {
166 return false;
167 }
168
169 let snapshot = self.snapshot(cx.app);
170 let (point, _) = paint.point_for_position(&snapshot, layout, position);
171
172 cx.dispatch_action(DeployMouseContextMenu { position, point });
173 true
174 }
175
176 fn mouse_up(
177 &self,
178 position: Vector2F,
179 cmd: bool,
180 shift: bool,
181 layout: &mut LayoutState,
182 paint: &mut PaintState,
183 cx: &mut EventContext,
184 ) -> bool {
185 let view = self.view(cx.app.as_ref());
186 let end_selection = view.has_pending_selection();
187 let pending_nonempty_selections = view.has_pending_nonempty_selection();
188
189 if end_selection {
190 cx.dispatch_action(Select(SelectPhase::End));
191 }
192
193 if !pending_nonempty_selections && cmd && paint.text_bounds.contains_point(position) {
194 let (point, target_point) =
195 paint.point_for_position(&self.snapshot(cx), layout, position);
196
197 if point == target_point {
198 if shift {
199 cx.dispatch_action(GoToFetchedTypeDefinition { point });
200 } else {
201 cx.dispatch_action(GoToFetchedDefinition { point });
202 }
203
204 return true;
205 }
206 }
207
208 end_selection
209 }
210
211 fn mouse_dragged(
212 &self,
213 MouseMovedEvent {
214 cmd,
215 shift,
216 position,
217 ..
218 }: MouseMovedEvent,
219 layout: &mut LayoutState,
220 paint: &mut PaintState,
221 cx: &mut EventContext,
222 ) -> bool {
223 // This will be handled more correctly once https://github.com/zed-industries/zed/issues/1218 is completed
224 // Don't trigger hover popover if mouse is hovering over context menu
225 let point = if paint.text_bounds.contains_point(position) {
226 let (point, target_point) =
227 paint.point_for_position(&self.snapshot(cx), layout, position);
228 if point == target_point {
229 Some(point)
230 } else {
231 None
232 }
233 } else {
234 None
235 };
236
237 cx.dispatch_action(UpdateGoToDefinitionLink {
238 point,
239 cmd_held: cmd,
240 shift_held: shift,
241 });
242
243 let view = self.view(cx.app);
244 if view.has_pending_selection() {
245 let rect = paint.text_bounds;
246 let mut scroll_delta = Vector2F::zero();
247
248 let vertical_margin = layout.line_height.min(rect.height() / 3.0);
249 let top = rect.origin_y() + vertical_margin;
250 let bottom = rect.lower_left().y() - vertical_margin;
251 if position.y() < top {
252 scroll_delta.set_y(-scale_vertical_mouse_autoscroll_delta(top - position.y()))
253 }
254 if position.y() > bottom {
255 scroll_delta.set_y(scale_vertical_mouse_autoscroll_delta(position.y() - bottom))
256 }
257
258 let horizontal_margin = layout.line_height.min(rect.width() / 3.0);
259 let left = rect.origin_x() + horizontal_margin;
260 let right = rect.upper_right().x() - horizontal_margin;
261 if position.x() < left {
262 scroll_delta.set_x(-scale_horizontal_mouse_autoscroll_delta(
263 left - position.x(),
264 ))
265 }
266 if position.x() > right {
267 scroll_delta.set_x(scale_horizontal_mouse_autoscroll_delta(
268 position.x() - right,
269 ))
270 }
271
272 let snapshot = self.snapshot(cx.app);
273 let (position, target_position) = paint.point_for_position(&snapshot, layout, position);
274
275 cx.dispatch_action(Select(SelectPhase::Update {
276 position,
277 goal_column: target_position.column(),
278 scroll_position: (snapshot.scroll_position() + scroll_delta)
279 .clamp(Vector2F::zero(), layout.scroll_max),
280 }));
281
282 cx.dispatch_action(HoverAt { point });
283 true
284 } else {
285 cx.dispatch_action(HoverAt { point });
286 false
287 }
288 }
289
290 fn mouse_moved(
291 &self,
292 MouseMovedEvent {
293 cmd,
294 shift,
295 position,
296 ..
297 }: MouseMovedEvent,
298 layout: &LayoutState,
299 paint: &PaintState,
300 cx: &mut EventContext,
301 ) -> bool {
302 // This will be handled more correctly once https://github.com/zed-industries/zed/issues/1218 is completed
303 // Don't trigger hover popover if mouse is hovering over context menu
304 let point = if paint.text_bounds.contains_point(position) {
305 let (point, target_point) =
306 paint.point_for_position(&self.snapshot(cx), layout, position);
307 if point == target_point {
308 Some(point)
309 } else {
310 None
311 }
312 } else {
313 None
314 };
315
316 cx.dispatch_action(UpdateGoToDefinitionLink {
317 point,
318 cmd_held: cmd,
319 shift_held: shift,
320 });
321
322 if paint
323 .context_menu_bounds
324 .map_or(false, |context_menu_bounds| {
325 context_menu_bounds.contains_point(position)
326 })
327 {
328 return false;
329 }
330
331 if paint
332 .hover_popover_bounds
333 .iter()
334 .any(|hover_bounds| hover_bounds.contains_point(position))
335 {
336 return false;
337 }
338
339 cx.dispatch_action(HoverAt { point });
340 true
341 }
342
343 fn modifiers_changed(&self, event: ModifiersChangedEvent, cx: &mut EventContext) -> bool {
344 cx.dispatch_action(CmdShiftChanged {
345 cmd_down: event.cmd,
346 shift_down: event.shift,
347 });
348 false
349 }
350
351 fn scroll(
352 &self,
353 position: Vector2F,
354 mut delta: Vector2F,
355 precise: bool,
356 layout: &mut LayoutState,
357 paint: &mut PaintState,
358 cx: &mut EventContext,
359 ) -> bool {
360 if !paint.bounds.contains_point(position) {
361 return false;
362 }
363
364 let snapshot = self.snapshot(cx.app);
365 let max_glyph_width = layout.em_width;
366 if !precise {
367 delta *= vec2f(max_glyph_width, layout.line_height);
368 }
369
370 let scroll_position = snapshot.scroll_position();
371 let x = (scroll_position.x() * max_glyph_width - delta.x()) / max_glyph_width;
372 let y = (scroll_position.y() * layout.line_height - delta.y()) / layout.line_height;
373 let scroll_position = vec2f(x, y).clamp(Vector2F::zero(), layout.scroll_max);
374
375 cx.dispatch_action(Scroll(scroll_position));
376
377 true
378 }
379
380 fn paint_background(
381 &self,
382 gutter_bounds: RectF,
383 text_bounds: RectF,
384 layout: &LayoutState,
385 cx: &mut PaintContext,
386 ) {
387 let bounds = gutter_bounds.union_rect(text_bounds);
388 let scroll_top = layout.snapshot.scroll_position().y() * layout.line_height;
389 let editor = self.view(cx.app);
390 cx.scene.push_quad(Quad {
391 bounds: gutter_bounds,
392 background: Some(self.style.gutter_background),
393 border: Border::new(0., Color::transparent_black()),
394 corner_radius: 0.,
395 });
396 cx.scene.push_quad(Quad {
397 bounds: text_bounds,
398 background: Some(self.style.background),
399 border: Border::new(0., Color::transparent_black()),
400 corner_radius: 0.,
401 });
402
403 if let EditorMode::Full = editor.mode {
404 let mut active_rows = layout.active_rows.iter().peekable();
405 while let Some((start_row, contains_non_empty_selection)) = active_rows.next() {
406 let mut end_row = *start_row;
407 while active_rows.peek().map_or(false, |r| {
408 *r.0 == end_row + 1 && r.1 == contains_non_empty_selection
409 }) {
410 active_rows.next().unwrap();
411 end_row += 1;
412 }
413
414 if !contains_non_empty_selection {
415 let origin = vec2f(
416 bounds.origin_x(),
417 bounds.origin_y() + (layout.line_height * *start_row as f32) - scroll_top,
418 );
419 let size = vec2f(
420 bounds.width(),
421 layout.line_height * (end_row - start_row + 1) as f32,
422 );
423 cx.scene.push_quad(Quad {
424 bounds: RectF::new(origin, size),
425 background: Some(self.style.active_line_background),
426 border: Border::default(),
427 corner_radius: 0.,
428 });
429 }
430 }
431
432 if let Some(highlighted_rows) = &layout.highlighted_rows {
433 let origin = vec2f(
434 bounds.origin_x(),
435 bounds.origin_y() + (layout.line_height * highlighted_rows.start as f32)
436 - scroll_top,
437 );
438 let size = vec2f(
439 bounds.width(),
440 layout.line_height * highlighted_rows.len() as f32,
441 );
442 cx.scene.push_quad(Quad {
443 bounds: RectF::new(origin, size),
444 background: Some(self.style.highlighted_line_background),
445 border: Border::default(),
446 corner_radius: 0.,
447 });
448 }
449 }
450 }
451
452 fn paint_gutter(
453 &mut self,
454 bounds: RectF,
455 visible_bounds: RectF,
456 layout: &mut LayoutState,
457 cx: &mut PaintContext,
458 ) {
459 let scroll_top = layout.snapshot.scroll_position().y() * layout.line_height;
460 for (ix, line) in layout.line_number_layouts.iter().enumerate() {
461 if let Some(line) = line {
462 let line_origin = bounds.origin()
463 + vec2f(
464 bounds.width() - line.width() - layout.gutter_padding,
465 ix as f32 * layout.line_height - (scroll_top % layout.line_height),
466 );
467 line.paint(line_origin, visible_bounds, layout.line_height, cx);
468 }
469 }
470
471 if let Some((row, indicator)) = layout.code_actions_indicator.as_mut() {
472 let mut x = bounds.width() - layout.gutter_padding;
473 let mut y = *row as f32 * layout.line_height - scroll_top;
474 x += ((layout.gutter_padding + layout.gutter_margin) - indicator.size().x()) / 2.;
475 y += (layout.line_height - indicator.size().y()) / 2.;
476 indicator.paint(bounds.origin() + vec2f(x, y), visible_bounds, cx);
477 }
478 }
479
480 fn paint_text(
481 &mut self,
482 bounds: RectF,
483 visible_bounds: RectF,
484 layout: &mut LayoutState,
485 paint: &mut PaintState,
486 cx: &mut PaintContext,
487 ) {
488 let view = self.view(cx.app);
489 let style = &self.style;
490 let local_replica_id = view.replica_id(cx);
491 let scroll_position = layout.snapshot.scroll_position();
492 let start_row = scroll_position.y() as u32;
493 let scroll_top = scroll_position.y() * layout.line_height;
494 let end_row = ((scroll_top + bounds.height()) / layout.line_height).ceil() as u32 + 1; // Add 1 to ensure selections bleed off screen
495 let max_glyph_width = layout.em_width;
496 let scroll_left = scroll_position.x() * max_glyph_width;
497 let content_origin = bounds.origin() + vec2f(layout.gutter_margin, 0.);
498
499 cx.scene.push_layer(Some(bounds));
500
501 cx.scene.push_cursor_region(CursorRegion {
502 bounds,
503 style: if !view.link_go_to_definition_state.definitions.is_empty() {
504 CursorStyle::PointingHand
505 } else {
506 CursorStyle::IBeam
507 },
508 });
509
510 for (range, color) in &layout.highlighted_ranges {
511 self.paint_highlighted_range(
512 range.clone(),
513 start_row,
514 end_row,
515 *color,
516 0.,
517 0.15 * layout.line_height,
518 layout,
519 content_origin,
520 scroll_top,
521 scroll_left,
522 bounds,
523 cx,
524 );
525 }
526
527 let mut cursors = SmallVec::<[Cursor; 32]>::new();
528 for (replica_id, selections) in &layout.selections {
529 let selection_style = style.replica_selection_style(*replica_id);
530 let corner_radius = 0.15 * layout.line_height;
531
532 for selection in selections {
533 self.paint_highlighted_range(
534 selection.range.clone(),
535 start_row,
536 end_row,
537 selection_style.selection,
538 corner_radius,
539 corner_radius * 2.,
540 layout,
541 content_origin,
542 scroll_top,
543 scroll_left,
544 bounds,
545 cx,
546 );
547
548 if view.show_local_cursors() || *replica_id != local_replica_id {
549 let cursor_position = selection.head;
550 if (start_row..end_row).contains(&cursor_position.row()) {
551 let cursor_row_layout =
552 &layout.line_layouts[(cursor_position.row() - start_row) as usize];
553 let cursor_column = cursor_position.column() as usize;
554
555 let cursor_character_x = cursor_row_layout.x_for_index(cursor_column);
556 let mut block_width =
557 cursor_row_layout.x_for_index(cursor_column + 1) - cursor_character_x;
558 if block_width == 0.0 {
559 block_width = layout.em_width;
560 }
561
562 let block_text =
563 if let CursorShape::Block = self.cursor_shape {
564 layout.snapshot.chars_at(cursor_position).next().and_then(
565 |character| {
566 let font_id =
567 cursor_row_layout.font_for_index(cursor_column)?;
568 let text = character.to_string();
569
570 Some(cx.text_layout_cache.layout_str(
571 &text,
572 cursor_row_layout.font_size(),
573 &[(
574 text.len(),
575 RunStyle {
576 font_id,
577 color: style.background,
578 underline: Default::default(),
579 },
580 )],
581 ))
582 },
583 )
584 } else {
585 None
586 };
587
588 let x = cursor_character_x - scroll_left;
589 let y = cursor_position.row() as f32 * layout.line_height - scroll_top;
590 cursors.push(Cursor {
591 color: selection_style.cursor,
592 block_width,
593 origin: vec2f(x, y),
594 line_height: layout.line_height,
595 shape: self.cursor_shape,
596 block_text,
597 });
598 }
599 }
600 }
601 }
602
603 if let Some(visible_text_bounds) = bounds.intersection(visible_bounds) {
604 // Draw glyphs
605 for (ix, line) in layout.line_layouts.iter().enumerate() {
606 let row = start_row + ix as u32;
607 line.paint(
608 content_origin
609 + vec2f(-scroll_left, row as f32 * layout.line_height - scroll_top),
610 visible_text_bounds,
611 layout.line_height,
612 cx,
613 );
614 }
615 }
616
617 cx.scene.push_layer(Some(bounds));
618 for cursor in cursors {
619 cursor.paint(content_origin, cx);
620 }
621 cx.scene.pop_layer();
622
623 if let Some((position, context_menu)) = layout.context_menu.as_mut() {
624 cx.scene.push_stacking_context(None);
625 let cursor_row_layout = &layout.line_layouts[(position.row() - start_row) as usize];
626 let x = cursor_row_layout.x_for_index(position.column() as usize) - scroll_left;
627 let y = (position.row() + 1) as f32 * layout.line_height - scroll_top;
628 let mut list_origin = content_origin + vec2f(x, y);
629 let list_width = context_menu.size().x();
630 let list_height = context_menu.size().y();
631
632 // Snap the right edge of the list to the right edge of the window if
633 // its horizontal bounds overflow.
634 if list_origin.x() + list_width > cx.window_size.x() {
635 list_origin.set_x((cx.window_size.x() - list_width).max(0.));
636 }
637
638 if list_origin.y() + list_height > bounds.max_y() {
639 list_origin.set_y(list_origin.y() - layout.line_height - list_height);
640 }
641
642 context_menu.paint(
643 list_origin,
644 RectF::from_points(Vector2F::zero(), vec2f(f32::MAX, f32::MAX)), // Let content bleed outside of editor
645 cx,
646 );
647
648 paint.context_menu_bounds = Some(RectF::new(list_origin, context_menu.size()));
649
650 cx.scene.pop_stacking_context();
651 }
652
653 if let Some((position, hover_popovers)) = layout.hover_popovers.as_mut() {
654 cx.scene.push_stacking_context(None);
655
656 // This is safe because we check on layout whether the required row is available
657 let hovered_row_layout = &layout.line_layouts[(position.row() - start_row) as usize];
658
659 // Minimum required size: Take the first popover, and add 1.5 times the minimum popover
660 // height. This is the size we will use to decide whether to render popovers above or below
661 // the hovered line.
662 let first_size = hover_popovers[0].size();
663 let height_to_reserve =
664 first_size.y() + 1.5 * MIN_POPOVER_LINE_HEIGHT as f32 * layout.line_height;
665
666 // Compute Hovered Point
667 let x = hovered_row_layout.x_for_index(position.column() as usize) - scroll_left;
668 let y = position.row() as f32 * layout.line_height - scroll_top;
669 let hovered_point = content_origin + vec2f(x, y);
670
671 paint.hover_popover_bounds.clear();
672
673 if hovered_point.y() - height_to_reserve > 0.0 {
674 // There is enough space above. Render popovers above the hovered point
675 let mut current_y = hovered_point.y();
676 for hover_popover in hover_popovers {
677 let size = hover_popover.size();
678 let mut popover_origin = vec2f(hovered_point.x(), current_y - size.y());
679
680 let x_out_of_bounds = bounds.max_x() - (popover_origin.x() + size.x());
681 if x_out_of_bounds < 0.0 {
682 popover_origin.set_x(popover_origin.x() + x_out_of_bounds);
683 }
684
685 hover_popover.paint(
686 popover_origin,
687 RectF::from_points(Vector2F::zero(), vec2f(f32::MAX, f32::MAX)), // Let content bleed outside of editor
688 cx,
689 );
690
691 paint.hover_popover_bounds.push(
692 RectF::new(popover_origin, hover_popover.size())
693 .dilate(Vector2F::new(0., 5.)),
694 );
695
696 current_y = popover_origin.y() - HOVER_POPOVER_GAP;
697 }
698 } else {
699 // There is not enough space above. Render popovers below the hovered point
700 let mut current_y = hovered_point.y() + layout.line_height;
701 for hover_popover in hover_popovers {
702 let size = hover_popover.size();
703 let mut popover_origin = vec2f(hovered_point.x(), current_y);
704
705 let x_out_of_bounds = bounds.max_x() - (popover_origin.x() + size.x());
706 if x_out_of_bounds < 0.0 {
707 popover_origin.set_x(popover_origin.x() + x_out_of_bounds);
708 }
709
710 hover_popover.paint(
711 popover_origin,
712 RectF::from_points(Vector2F::zero(), vec2f(f32::MAX, f32::MAX)), // Let content bleed outside of editor
713 cx,
714 );
715
716 paint.hover_popover_bounds.push(
717 RectF::new(popover_origin, hover_popover.size())
718 .dilate(Vector2F::new(0., 5.)),
719 );
720
721 current_y = popover_origin.y() + size.y() + HOVER_POPOVER_GAP;
722 }
723 }
724
725 cx.scene.pop_stacking_context();
726 }
727
728 cx.scene.pop_layer();
729 }
730
731 #[allow(clippy::too_many_arguments)]
732 fn paint_highlighted_range(
733 &self,
734 range: Range<DisplayPoint>,
735 start_row: u32,
736 end_row: u32,
737 color: Color,
738 corner_radius: f32,
739 line_end_overshoot: f32,
740 layout: &LayoutState,
741 content_origin: Vector2F,
742 scroll_top: f32,
743 scroll_left: f32,
744 bounds: RectF,
745 cx: &mut PaintContext,
746 ) {
747 if range.start != range.end {
748 let row_range = if range.end.column() == 0 {
749 cmp::max(range.start.row(), start_row)..cmp::min(range.end.row(), end_row)
750 } else {
751 cmp::max(range.start.row(), start_row)..cmp::min(range.end.row() + 1, end_row)
752 };
753
754 let highlighted_range = HighlightedRange {
755 color,
756 line_height: layout.line_height,
757 corner_radius,
758 start_y: content_origin.y() + row_range.start as f32 * layout.line_height
759 - scroll_top,
760 lines: row_range
761 .into_iter()
762 .map(|row| {
763 let line_layout = &layout.line_layouts[(row - start_row) as usize];
764 HighlightedRangeLine {
765 start_x: if row == range.start.row() {
766 content_origin.x()
767 + line_layout.x_for_index(range.start.column() as usize)
768 - scroll_left
769 } else {
770 content_origin.x() - scroll_left
771 },
772 end_x: if row == range.end.row() {
773 content_origin.x()
774 + line_layout.x_for_index(range.end.column() as usize)
775 - scroll_left
776 } else {
777 content_origin.x() + line_layout.width() + line_end_overshoot
778 - scroll_left
779 },
780 }
781 })
782 .collect(),
783 };
784
785 highlighted_range.paint(bounds, cx.scene);
786 }
787 }
788
789 fn paint_blocks(
790 &mut self,
791 bounds: RectF,
792 visible_bounds: RectF,
793 layout: &mut LayoutState,
794 cx: &mut PaintContext,
795 ) {
796 let scroll_position = layout.snapshot.scroll_position();
797 let scroll_left = scroll_position.x() * layout.em_width;
798 let scroll_top = scroll_position.y() * layout.line_height;
799
800 for block in &mut layout.blocks {
801 let mut origin =
802 bounds.origin() + vec2f(0., block.row as f32 * layout.line_height - scroll_top);
803 if !matches!(block.style, BlockStyle::Sticky) {
804 origin += vec2f(-scroll_left, 0.);
805 }
806 block.element.paint(origin, visible_bounds, cx);
807 }
808 }
809
810 fn max_line_number_width(&self, snapshot: &EditorSnapshot, cx: &LayoutContext) -> f32 {
811 let digit_count = (snapshot.max_buffer_row() as f32).log10().floor() as usize + 1;
812 let style = &self.style;
813
814 cx.text_layout_cache
815 .layout_str(
816 "1".repeat(digit_count).as_str(),
817 style.text.font_size,
818 &[(
819 digit_count,
820 RunStyle {
821 font_id: style.text.font_id,
822 color: Color::black(),
823 underline: Default::default(),
824 },
825 )],
826 )
827 .width()
828 }
829
830 fn layout_line_numbers(
831 &self,
832 rows: Range<u32>,
833 active_rows: &BTreeMap<u32, bool>,
834 snapshot: &EditorSnapshot,
835 cx: &LayoutContext,
836 ) -> Vec<Option<text_layout::Line>> {
837 let style = &self.style;
838 let include_line_numbers = snapshot.mode == EditorMode::Full;
839 let mut line_number_layouts = Vec::with_capacity(rows.len());
840 let mut line_number = String::new();
841 for (ix, row) in snapshot
842 .buffer_rows(rows.start)
843 .take((rows.end - rows.start) as usize)
844 .enumerate()
845 {
846 let display_row = rows.start + ix as u32;
847 let color = if active_rows.contains_key(&display_row) {
848 style.line_number_active
849 } else {
850 style.line_number
851 };
852 if let Some(buffer_row) = row {
853 if include_line_numbers {
854 line_number.clear();
855 write!(&mut line_number, "{}", buffer_row + 1).unwrap();
856 line_number_layouts.push(Some(cx.text_layout_cache.layout_str(
857 &line_number,
858 style.text.font_size,
859 &[(
860 line_number.len(),
861 RunStyle {
862 font_id: style.text.font_id,
863 color,
864 underline: Default::default(),
865 },
866 )],
867 )));
868 }
869 } else {
870 line_number_layouts.push(None);
871 }
872 }
873
874 line_number_layouts
875 }
876
877 fn layout_lines(
878 &mut self,
879 rows: Range<u32>,
880 snapshot: &EditorSnapshot,
881 cx: &LayoutContext,
882 ) -> Vec<text_layout::Line> {
883 if rows.start >= rows.end {
884 return Vec::new();
885 }
886
887 // When the editor is empty and unfocused, then show the placeholder.
888 if snapshot.is_empty() && !snapshot.is_focused() {
889 let placeholder_style = self
890 .style
891 .placeholder_text
892 .as_ref()
893 .unwrap_or(&self.style.text);
894 let placeholder_text = snapshot.placeholder_text();
895 let placeholder_lines = placeholder_text
896 .as_ref()
897 .map_or("", AsRef::as_ref)
898 .split('\n')
899 .skip(rows.start as usize)
900 .chain(iter::repeat(""))
901 .take(rows.len());
902 placeholder_lines
903 .map(|line| {
904 cx.text_layout_cache.layout_str(
905 line,
906 placeholder_style.font_size,
907 &[(
908 line.len(),
909 RunStyle {
910 font_id: placeholder_style.font_id,
911 color: placeholder_style.color,
912 underline: Default::default(),
913 },
914 )],
915 )
916 })
917 .collect()
918 } else {
919 let style = &self.style;
920 let chunks = snapshot.chunks(rows.clone(), true).map(|chunk| {
921 let mut highlight_style = chunk
922 .syntax_highlight_id
923 .and_then(|id| id.style(&style.syntax));
924
925 if let Some(chunk_highlight) = chunk.highlight_style {
926 if let Some(highlight_style) = highlight_style.as_mut() {
927 highlight_style.highlight(chunk_highlight);
928 } else {
929 highlight_style = Some(chunk_highlight);
930 }
931 }
932
933 let mut diagnostic_highlight = HighlightStyle::default();
934
935 if chunk.is_unnecessary {
936 diagnostic_highlight.fade_out = Some(style.unnecessary_code_fade);
937 }
938
939 if let Some(severity) = chunk.diagnostic_severity {
940 // Omit underlines for HINT/INFO diagnostics on 'unnecessary' code.
941 if severity <= DiagnosticSeverity::WARNING || !chunk.is_unnecessary {
942 let diagnostic_style = super::diagnostic_style(severity, true, style);
943 diagnostic_highlight.underline = Some(Underline {
944 color: Some(diagnostic_style.message.text.color),
945 thickness: 1.0.into(),
946 squiggly: true,
947 });
948 }
949 }
950
951 if let Some(highlight_style) = highlight_style.as_mut() {
952 highlight_style.highlight(diagnostic_highlight);
953 } else {
954 highlight_style = Some(diagnostic_highlight);
955 }
956
957 (chunk.text, highlight_style)
958 });
959 layout_highlighted_chunks(
960 chunks,
961 &style.text,
962 cx.text_layout_cache,
963 cx.font_cache,
964 MAX_LINE_LEN,
965 rows.len() as usize,
966 )
967 }
968 }
969
970 #[allow(clippy::too_many_arguments)]
971 fn layout_blocks(
972 &mut self,
973 rows: Range<u32>,
974 snapshot: &EditorSnapshot,
975 editor_width: f32,
976 scroll_width: f32,
977 gutter_padding: f32,
978 gutter_width: f32,
979 em_width: f32,
980 text_x: f32,
981 line_height: f32,
982 style: &EditorStyle,
983 line_layouts: &[text_layout::Line],
984 cx: &mut LayoutContext,
985 ) -> (f32, Vec<BlockLayout>) {
986 let editor = if let Some(editor) = self.view.upgrade(cx) {
987 editor
988 } else {
989 return Default::default();
990 };
991
992 let tooltip_style = cx.global::<Settings>().theme.tooltip.clone();
993 let scroll_x = snapshot.scroll_position.x();
994 let (fixed_blocks, non_fixed_blocks) = snapshot
995 .blocks_in_range(rows.clone())
996 .partition::<Vec<_>, _>(|(_, block)| match block {
997 TransformBlock::ExcerptHeader { .. } => false,
998 TransformBlock::Custom(block) => block.style() == BlockStyle::Fixed,
999 });
1000 let mut render_block = |block: &TransformBlock, width: f32| {
1001 let mut element = match block {
1002 TransformBlock::Custom(block) => {
1003 let align_to = block
1004 .position()
1005 .to_point(&snapshot.buffer_snapshot)
1006 .to_display_point(snapshot);
1007 let anchor_x = text_x
1008 + if rows.contains(&align_to.row()) {
1009 line_layouts[(align_to.row() - rows.start) as usize]
1010 .x_for_index(align_to.column() as usize)
1011 } else {
1012 layout_line(align_to.row(), snapshot, style, cx.text_layout_cache)
1013 .x_for_index(align_to.column() as usize)
1014 };
1015
1016 cx.render(&editor, |_, cx| {
1017 block.render(&mut BlockContext {
1018 cx,
1019 anchor_x,
1020 gutter_padding,
1021 line_height,
1022 scroll_x,
1023 gutter_width,
1024 em_width,
1025 })
1026 })
1027 }
1028 TransformBlock::ExcerptHeader {
1029 key,
1030 buffer,
1031 range,
1032 starts_new_buffer,
1033 ..
1034 } => {
1035 let jump_icon = project::File::from_dyn(buffer.file()).map(|file| {
1036 let jump_position = range
1037 .primary
1038 .as_ref()
1039 .map_or(range.context.start, |primary| primary.start);
1040 let jump_action = crate::Jump {
1041 path: ProjectPath {
1042 worktree_id: file.worktree_id(cx),
1043 path: file.path.clone(),
1044 },
1045 position: language::ToPoint::to_point(&jump_position, buffer),
1046 anchor: jump_position,
1047 };
1048
1049 enum JumpIcon {}
1050 cx.render(&editor, |_, cx| {
1051 MouseEventHandler::new::<JumpIcon, _, _>(*key, cx, |state, _| {
1052 let style = style.jump_icon.style_for(state, false);
1053 Svg::new("icons/arrow_up_right_8.svg")
1054 .with_color(style.color)
1055 .constrained()
1056 .with_width(style.icon_width)
1057 .aligned()
1058 .contained()
1059 .with_style(style.container)
1060 .constrained()
1061 .with_width(style.button_width)
1062 .with_height(style.button_width)
1063 .boxed()
1064 })
1065 .with_cursor_style(CursorStyle::PointingHand)
1066 .on_click(MouseButton::Left, move |_, cx| {
1067 cx.dispatch_action(jump_action.clone())
1068 })
1069 .with_tooltip::<JumpIcon, _>(
1070 *key,
1071 "Jump to Buffer".to_string(),
1072 Some(Box::new(crate::OpenExcerpts)),
1073 tooltip_style.clone(),
1074 cx,
1075 )
1076 .aligned()
1077 .flex_float()
1078 .boxed()
1079 })
1080 });
1081
1082 if *starts_new_buffer {
1083 let style = &self.style.diagnostic_path_header;
1084 let font_size =
1085 (style.text_scale_factor * self.style.text.font_size).round();
1086
1087 let mut filename = None;
1088 let mut parent_path = None;
1089 if let Some(file) = buffer.file() {
1090 let path = file.path();
1091 filename = path.file_name().map(|f| f.to_string_lossy().to_string());
1092 parent_path =
1093 path.parent().map(|p| p.to_string_lossy().to_string() + "/");
1094 }
1095
1096 Flex::row()
1097 .with_child(
1098 Label::new(
1099 filename.unwrap_or_else(|| "untitled".to_string()),
1100 style.filename.text.clone().with_font_size(font_size),
1101 )
1102 .contained()
1103 .with_style(style.filename.container)
1104 .aligned()
1105 .boxed(),
1106 )
1107 .with_children(parent_path.map(|path| {
1108 Label::new(path, style.path.text.clone().with_font_size(font_size))
1109 .contained()
1110 .with_style(style.path.container)
1111 .aligned()
1112 .boxed()
1113 }))
1114 .with_children(jump_icon)
1115 .contained()
1116 .with_style(style.container)
1117 .with_padding_left(gutter_padding)
1118 .with_padding_right(gutter_padding)
1119 .expanded()
1120 .named("path header block")
1121 } else {
1122 let text_style = self.style.text.clone();
1123 Flex::row()
1124 .with_child(Label::new("…".to_string(), text_style).boxed())
1125 .with_children(jump_icon)
1126 .contained()
1127 .with_padding_left(gutter_padding)
1128 .with_padding_right(gutter_padding)
1129 .expanded()
1130 .named("collapsed context")
1131 }
1132 }
1133 };
1134
1135 element.layout(
1136 SizeConstraint {
1137 min: Vector2F::zero(),
1138 max: vec2f(width, block.height() as f32 * line_height),
1139 },
1140 cx,
1141 );
1142 element
1143 };
1144
1145 let mut fixed_block_max_width = 0f32;
1146 let mut blocks = Vec::new();
1147 for (row, block) in fixed_blocks {
1148 let element = render_block(block, f32::INFINITY);
1149 fixed_block_max_width = fixed_block_max_width.max(element.size().x() + em_width);
1150 blocks.push(BlockLayout {
1151 row,
1152 element,
1153 style: BlockStyle::Fixed,
1154 });
1155 }
1156 for (row, block) in non_fixed_blocks {
1157 let style = match block {
1158 TransformBlock::Custom(block) => block.style(),
1159 TransformBlock::ExcerptHeader { .. } => BlockStyle::Sticky,
1160 };
1161 let width = match style {
1162 BlockStyle::Sticky => editor_width,
1163 BlockStyle::Flex => editor_width
1164 .max(fixed_block_max_width)
1165 .max(gutter_width + scroll_width),
1166 BlockStyle::Fixed => unreachable!(),
1167 };
1168 let element = render_block(block, width);
1169 blocks.push(BlockLayout {
1170 row,
1171 element,
1172 style,
1173 });
1174 }
1175 (
1176 scroll_width.max(fixed_block_max_width - gutter_width),
1177 blocks,
1178 )
1179 }
1180}
1181
1182impl Element for EditorElement {
1183 type LayoutState = LayoutState;
1184 type PaintState = PaintState;
1185
1186 fn layout(
1187 &mut self,
1188 constraint: SizeConstraint,
1189 cx: &mut LayoutContext,
1190 ) -> (Vector2F, Self::LayoutState) {
1191 let mut size = constraint.max;
1192 if size.x().is_infinite() {
1193 unimplemented!("we don't yet handle an infinite width constraint on buffer elements");
1194 }
1195
1196 let snapshot = self.snapshot(cx.app);
1197 let style = self.style.clone();
1198 let line_height = style.text.line_height(cx.font_cache);
1199
1200 let gutter_padding;
1201 let gutter_width;
1202 let gutter_margin;
1203 if snapshot.mode == EditorMode::Full {
1204 gutter_padding = style.text.em_width(cx.font_cache) * style.gutter_padding_factor;
1205 gutter_width = self.max_line_number_width(&snapshot, cx) + gutter_padding * 2.0;
1206 gutter_margin = -style.text.descent(cx.font_cache);
1207 } else {
1208 gutter_padding = 0.0;
1209 gutter_width = 0.0;
1210 gutter_margin = 0.0;
1211 };
1212
1213 let text_width = size.x() - gutter_width;
1214 let em_width = style.text.em_width(cx.font_cache);
1215 let em_advance = style.text.em_advance(cx.font_cache);
1216 let overscroll = vec2f(em_width, 0.);
1217 let snapshot = self.update_view(cx.app, |view, cx| {
1218 let wrap_width = match view.soft_wrap_mode(cx) {
1219 SoftWrap::None => Some((MAX_LINE_LEN / 2) as f32 * em_advance),
1220 SoftWrap::EditorWidth => {
1221 Some(text_width - gutter_margin - overscroll.x() - em_width)
1222 }
1223 SoftWrap::Column(column) => Some(column as f32 * em_advance),
1224 };
1225
1226 if view.set_wrap_width(wrap_width, cx) {
1227 view.snapshot(cx)
1228 } else {
1229 snapshot
1230 }
1231 });
1232
1233 let scroll_height = (snapshot.max_point().row() + 1) as f32 * line_height;
1234 if let EditorMode::AutoHeight { max_lines } = snapshot.mode {
1235 size.set_y(
1236 scroll_height
1237 .min(constraint.max_along(Axis::Vertical))
1238 .max(constraint.min_along(Axis::Vertical))
1239 .min(line_height * max_lines as f32),
1240 )
1241 } else if let EditorMode::SingleLine = snapshot.mode {
1242 size.set_y(
1243 line_height
1244 .min(constraint.max_along(Axis::Vertical))
1245 .max(constraint.min_along(Axis::Vertical)),
1246 )
1247 } else if size.y().is_infinite() {
1248 size.set_y(scroll_height);
1249 }
1250 let gutter_size = vec2f(gutter_width, size.y());
1251 let text_size = vec2f(text_width, size.y());
1252
1253 let (autoscroll_horizontally, mut snapshot) = self.update_view(cx.app, |view, cx| {
1254 let autoscroll_horizontally = view.autoscroll_vertically(size.y(), line_height, cx);
1255 let snapshot = view.snapshot(cx);
1256 (autoscroll_horizontally, snapshot)
1257 });
1258
1259 let scroll_position = snapshot.scroll_position();
1260 // The scroll position is a fractional point, the whole number of which represents
1261 // the top of the window in terms of display rows.
1262 let start_row = scroll_position.y() as u32;
1263 let scroll_top = scroll_position.y() * line_height;
1264
1265 // Add 1 to ensure selections bleed off screen
1266 let end_row = 1 + cmp::min(
1267 ((scroll_top + size.y()) / line_height).ceil() as u32,
1268 snapshot.max_point().row(),
1269 );
1270
1271 let start_anchor = if start_row == 0 {
1272 Anchor::min()
1273 } else {
1274 snapshot
1275 .buffer_snapshot
1276 .anchor_before(DisplayPoint::new(start_row, 0).to_offset(&snapshot, Bias::Left))
1277 };
1278 let end_anchor = if end_row > snapshot.max_point().row() {
1279 Anchor::max()
1280 } else {
1281 snapshot
1282 .buffer_snapshot
1283 .anchor_before(DisplayPoint::new(end_row, 0).to_offset(&snapshot, Bias::Right))
1284 };
1285
1286 let mut selections: Vec<(ReplicaId, Vec<SelectionLayout>)> = Vec::new();
1287 let mut active_rows = BTreeMap::new();
1288 let mut highlighted_rows = None;
1289 let mut highlighted_ranges = Vec::new();
1290 self.update_view(cx.app, |view, cx| {
1291 let display_map = view.display_map.update(cx, |map, cx| map.snapshot(cx));
1292
1293 highlighted_rows = view.highlighted_rows();
1294 let theme = cx.global::<Settings>().theme.as_ref();
1295 highlighted_ranges = view.background_highlights_in_range(
1296 start_anchor.clone()..end_anchor.clone(),
1297 &display_map,
1298 theme,
1299 );
1300
1301 let mut remote_selections = HashMap::default();
1302 for (replica_id, line_mode, selection) in display_map
1303 .buffer_snapshot
1304 .remote_selections_in_range(&(start_anchor.clone()..end_anchor.clone()))
1305 {
1306 // The local selections match the leader's selections.
1307 if Some(replica_id) == view.leader_replica_id {
1308 continue;
1309 }
1310 remote_selections
1311 .entry(replica_id)
1312 .or_insert(Vec::new())
1313 .push(SelectionLayout::new(selection, line_mode, &display_map));
1314 }
1315 selections.extend(remote_selections);
1316
1317 if view.show_local_selections {
1318 let mut local_selections = view
1319 .selections
1320 .disjoint_in_range(start_anchor..end_anchor, cx);
1321 local_selections.extend(view.selections.pending(cx));
1322 for selection in &local_selections {
1323 let is_empty = selection.start == selection.end;
1324 let selection_start = snapshot.prev_line_boundary(selection.start).1;
1325 let selection_end = snapshot.next_line_boundary(selection.end).1;
1326 for row in cmp::max(selection_start.row(), start_row)
1327 ..=cmp::min(selection_end.row(), end_row)
1328 {
1329 let contains_non_empty_selection =
1330 active_rows.entry(row).or_insert(!is_empty);
1331 *contains_non_empty_selection |= !is_empty;
1332 }
1333 }
1334
1335 // Render the local selections in the leader's color when following.
1336 let local_replica_id = view
1337 .leader_replica_id
1338 .unwrap_or_else(|| view.replica_id(cx));
1339
1340 selections.push((
1341 local_replica_id,
1342 local_selections
1343 .into_iter()
1344 .map(|selection| {
1345 SelectionLayout::new(selection, view.selections.line_mode, &display_map)
1346 })
1347 .collect(),
1348 ));
1349 }
1350 });
1351
1352 let line_number_layouts =
1353 self.layout_line_numbers(start_row..end_row, &active_rows, &snapshot, cx);
1354
1355 let mut max_visible_line_width = 0.0;
1356 let line_layouts = self.layout_lines(start_row..end_row, &snapshot, cx);
1357 for line in &line_layouts {
1358 if line.width() > max_visible_line_width {
1359 max_visible_line_width = line.width();
1360 }
1361 }
1362
1363 let style = self.style.clone();
1364 let longest_line_width = layout_line(
1365 snapshot.longest_row(),
1366 &snapshot,
1367 &style,
1368 cx.text_layout_cache,
1369 )
1370 .width();
1371 let scroll_width = longest_line_width.max(max_visible_line_width) + overscroll.x();
1372 let em_width = style.text.em_width(cx.font_cache);
1373 let (scroll_width, blocks) = self.layout_blocks(
1374 start_row..end_row,
1375 &snapshot,
1376 size.x(),
1377 scroll_width,
1378 gutter_padding,
1379 gutter_width,
1380 em_width,
1381 gutter_width + gutter_margin,
1382 line_height,
1383 &style,
1384 &line_layouts,
1385 cx,
1386 );
1387
1388 let max_row = snapshot.max_point().row();
1389 let scroll_max = vec2f(
1390 ((scroll_width - text_size.x()) / em_width).max(0.0),
1391 max_row.saturating_sub(1) as f32,
1392 );
1393
1394 self.update_view(cx.app, |view, cx| {
1395 let clamped = view.clamp_scroll_left(scroll_max.x());
1396
1397 let autoscrolled = if autoscroll_horizontally {
1398 view.autoscroll_horizontally(
1399 start_row,
1400 text_size.x(),
1401 scroll_width,
1402 em_width,
1403 &line_layouts,
1404 cx,
1405 )
1406 } else {
1407 false
1408 };
1409
1410 if clamped || autoscrolled {
1411 snapshot = view.snapshot(cx);
1412 }
1413 });
1414
1415 let mut context_menu = None;
1416 let mut code_actions_indicator = None;
1417 let mut hover = None;
1418 cx.render(&self.view.upgrade(cx).unwrap(), |view, cx| {
1419 let newest_selection_head = view
1420 .selections
1421 .newest::<usize>(cx)
1422 .head()
1423 .to_display_point(&snapshot);
1424
1425 let style = view.style(cx);
1426 if (start_row..end_row).contains(&newest_selection_head.row()) {
1427 if view.context_menu_visible() {
1428 context_menu =
1429 view.render_context_menu(newest_selection_head, style.clone(), cx);
1430 }
1431
1432 code_actions_indicator = view
1433 .render_code_actions_indicator(&style, cx)
1434 .map(|indicator| (newest_selection_head.row(), indicator));
1435 }
1436
1437 let visible_rows = start_row..start_row + line_layouts.len() as u32;
1438 hover = view.hover_state.render(&snapshot, &style, visible_rows, cx);
1439 });
1440
1441 if let Some((_, context_menu)) = context_menu.as_mut() {
1442 context_menu.layout(
1443 SizeConstraint {
1444 min: Vector2F::zero(),
1445 max: vec2f(
1446 cx.window_size.x() * 0.7,
1447 (12. * line_height).min((size.y() - line_height) / 2.),
1448 ),
1449 },
1450 cx,
1451 );
1452 }
1453
1454 if let Some((_, indicator)) = code_actions_indicator.as_mut() {
1455 indicator.layout(
1456 SizeConstraint::strict_along(
1457 Axis::Vertical,
1458 line_height * style.code_actions.vertical_scale,
1459 ),
1460 cx,
1461 );
1462 }
1463
1464 if let Some((_, hover_popovers)) = hover.as_mut() {
1465 for hover_popover in hover_popovers.iter_mut() {
1466 hover_popover.layout(
1467 SizeConstraint {
1468 min: Vector2F::zero(),
1469 max: vec2f(
1470 (120. * em_width) // Default size
1471 .min(size.x() / 2.) // Shrink to half of the editor width
1472 .max(MIN_POPOVER_CHARACTER_WIDTH * em_width), // Apply minimum width of 20 characters
1473 (16. * line_height) // Default size
1474 .min(size.y() / 2.) // Shrink to half of the editor height
1475 .max(MIN_POPOVER_LINE_HEIGHT * line_height), // Apply minimum height of 4 lines
1476 ),
1477 },
1478 cx,
1479 );
1480 }
1481 }
1482
1483 (
1484 size,
1485 LayoutState {
1486 size,
1487 scroll_max,
1488 gutter_size,
1489 gutter_padding,
1490 text_size,
1491 gutter_margin,
1492 snapshot,
1493 active_rows,
1494 highlighted_rows,
1495 highlighted_ranges,
1496 line_layouts,
1497 line_number_layouts,
1498 blocks,
1499 line_height,
1500 em_width,
1501 em_advance,
1502 selections,
1503 context_menu,
1504 code_actions_indicator,
1505 hover_popovers: hover,
1506 },
1507 )
1508 }
1509
1510 fn paint(
1511 &mut self,
1512 bounds: RectF,
1513 visible_bounds: RectF,
1514 layout: &mut Self::LayoutState,
1515 cx: &mut PaintContext,
1516 ) -> Self::PaintState {
1517 cx.scene.push_layer(Some(bounds));
1518
1519 let gutter_bounds = RectF::new(bounds.origin(), layout.gutter_size);
1520 let text_bounds = RectF::new(
1521 bounds.origin() + vec2f(layout.gutter_size.x(), 0.0),
1522 layout.text_size,
1523 );
1524
1525 let mut paint_state = PaintState {
1526 bounds,
1527 gutter_bounds,
1528 text_bounds,
1529 context_menu_bounds: None,
1530 hover_popover_bounds: Default::default(),
1531 };
1532
1533 self.paint_background(gutter_bounds, text_bounds, layout, cx);
1534 if layout.gutter_size.x() > 0. {
1535 self.paint_gutter(gutter_bounds, visible_bounds, layout, cx);
1536 }
1537 self.paint_text(text_bounds, visible_bounds, layout, &mut paint_state, cx);
1538
1539 if !layout.blocks.is_empty() {
1540 cx.scene.push_layer(Some(bounds));
1541 self.paint_blocks(bounds, visible_bounds, layout, cx);
1542 cx.scene.pop_layer();
1543 }
1544
1545 cx.scene.pop_layer();
1546
1547 paint_state
1548 }
1549
1550 fn dispatch_event(
1551 &mut self,
1552 event: &Event,
1553 _: RectF,
1554 _: RectF,
1555 layout: &mut LayoutState,
1556 paint: &mut PaintState,
1557 cx: &mut EventContext,
1558 ) -> bool {
1559 if let Some((_, context_menu)) = &mut layout.context_menu {
1560 if context_menu.dispatch_event(event, cx) {
1561 return true;
1562 }
1563 }
1564
1565 if let Some((_, indicator)) = &mut layout.code_actions_indicator {
1566 if indicator.dispatch_event(event, cx) {
1567 return true;
1568 }
1569 }
1570
1571 if let Some((_, popover_elements)) = &mut layout.hover_popovers {
1572 for popover_element in popover_elements.iter_mut() {
1573 if popover_element.dispatch_event(event, cx) {
1574 return true;
1575 }
1576 }
1577 }
1578
1579 for block in &mut layout.blocks {
1580 if block.element.dispatch_event(event, cx) {
1581 return true;
1582 }
1583 }
1584
1585 match event {
1586 &Event::MouseDown(
1587 event @ MouseButtonEvent {
1588 button: MouseButton::Left,
1589 ..
1590 },
1591 ) => self.mouse_down(event, layout, paint, cx),
1592
1593 &Event::MouseDown(MouseButtonEvent {
1594 button: MouseButton::Right,
1595 position,
1596 ..
1597 }) => self.mouse_right_down(position, layout, paint, cx),
1598
1599 &Event::MouseUp(MouseButtonEvent {
1600 button: MouseButton::Left,
1601 position,
1602 cmd,
1603 shift,
1604 ..
1605 }) => self.mouse_up(position, cmd, shift, layout, paint, cx),
1606
1607 Event::MouseMoved(
1608 event @ MouseMovedEvent {
1609 pressed_button: Some(MouseButton::Left),
1610 ..
1611 },
1612 ) => self.mouse_dragged(*event, layout, paint, cx),
1613
1614 Event::ScrollWheel(ScrollWheelEvent {
1615 position,
1616 delta,
1617 precise,
1618 ..
1619 }) => self.scroll(*position, *delta, *precise, layout, paint, cx),
1620
1621 &Event::ModifiersChanged(event) => self.modifiers_changed(event, cx),
1622
1623 &Event::MouseMoved(event) => self.mouse_moved(event, layout, paint, cx),
1624
1625 _ => false,
1626 }
1627 }
1628
1629 fn rect_for_text_range(
1630 &self,
1631 range_utf16: Range<usize>,
1632 bounds: RectF,
1633 _: RectF,
1634 layout: &Self::LayoutState,
1635 _: &Self::PaintState,
1636 _: &gpui::MeasurementContext,
1637 ) -> Option<RectF> {
1638 let text_bounds = RectF::new(
1639 bounds.origin() + vec2f(layout.gutter_size.x(), 0.0),
1640 layout.text_size,
1641 );
1642 let content_origin = text_bounds.origin() + vec2f(layout.gutter_margin, 0.);
1643 let scroll_position = layout.snapshot.scroll_position();
1644 let start_row = scroll_position.y() as u32;
1645 let scroll_top = scroll_position.y() * layout.line_height;
1646 let scroll_left = scroll_position.x() * layout.em_width;
1647
1648 let range_start =
1649 OffsetUtf16(range_utf16.start).to_display_point(&layout.snapshot.display_snapshot);
1650 if range_start.row() < start_row {
1651 return None;
1652 }
1653
1654 let line = layout
1655 .line_layouts
1656 .get((range_start.row() - start_row) as usize)?;
1657 let range_start_x = line.x_for_index(range_start.column() as usize);
1658 let range_start_y = range_start.row() as f32 * layout.line_height;
1659 Some(RectF::new(
1660 content_origin + vec2f(range_start_x, range_start_y + layout.line_height)
1661 - vec2f(scroll_left, scroll_top),
1662 vec2f(layout.em_width, layout.line_height),
1663 ))
1664 }
1665
1666 fn debug(
1667 &self,
1668 bounds: RectF,
1669 _: &Self::LayoutState,
1670 _: &Self::PaintState,
1671 _: &gpui::DebugContext,
1672 ) -> json::Value {
1673 json!({
1674 "type": "BufferElement",
1675 "bounds": bounds.to_json()
1676 })
1677 }
1678}
1679
1680pub struct LayoutState {
1681 size: Vector2F,
1682 scroll_max: Vector2F,
1683 gutter_size: Vector2F,
1684 gutter_padding: f32,
1685 gutter_margin: f32,
1686 text_size: Vector2F,
1687 snapshot: EditorSnapshot,
1688 active_rows: BTreeMap<u32, bool>,
1689 highlighted_rows: Option<Range<u32>>,
1690 line_layouts: Vec<text_layout::Line>,
1691 line_number_layouts: Vec<Option<text_layout::Line>>,
1692 blocks: Vec<BlockLayout>,
1693 line_height: f32,
1694 em_width: f32,
1695 em_advance: f32,
1696 highlighted_ranges: Vec<(Range<DisplayPoint>, Color)>,
1697 selections: Vec<(ReplicaId, Vec<SelectionLayout>)>,
1698 context_menu: Option<(DisplayPoint, ElementBox)>,
1699 code_actions_indicator: Option<(u32, ElementBox)>,
1700 hover_popovers: Option<(DisplayPoint, Vec<ElementBox>)>,
1701}
1702
1703struct BlockLayout {
1704 row: u32,
1705 element: ElementBox,
1706 style: BlockStyle,
1707}
1708
1709fn layout_line(
1710 row: u32,
1711 snapshot: &EditorSnapshot,
1712 style: &EditorStyle,
1713 layout_cache: &TextLayoutCache,
1714) -> text_layout::Line {
1715 let mut line = snapshot.line(row);
1716
1717 if line.len() > MAX_LINE_LEN {
1718 let mut len = MAX_LINE_LEN;
1719 while !line.is_char_boundary(len) {
1720 len -= 1;
1721 }
1722
1723 line.truncate(len);
1724 }
1725
1726 layout_cache.layout_str(
1727 &line,
1728 style.text.font_size,
1729 &[(
1730 snapshot.line_len(row) as usize,
1731 RunStyle {
1732 font_id: style.text.font_id,
1733 color: Color::black(),
1734 underline: Default::default(),
1735 },
1736 )],
1737 )
1738}
1739
1740pub struct PaintState {
1741 bounds: RectF,
1742 gutter_bounds: RectF,
1743 text_bounds: RectF,
1744 context_menu_bounds: Option<RectF>,
1745 hover_popover_bounds: Vec<RectF>,
1746}
1747
1748impl PaintState {
1749 /// Returns two display points:
1750 /// 1. The nearest *valid* position in the editor
1751 /// 2. An unclipped, potentially *invalid* position that maps directly to
1752 /// the given pixel position.
1753 fn point_for_position(
1754 &self,
1755 snapshot: &EditorSnapshot,
1756 layout: &LayoutState,
1757 position: Vector2F,
1758 ) -> (DisplayPoint, DisplayPoint) {
1759 let scroll_position = snapshot.scroll_position();
1760 let position = position - self.text_bounds.origin();
1761 let y = position.y().max(0.0).min(layout.size.y());
1762 let x = position.x() + (scroll_position.x() * layout.em_width);
1763 let row = (y / layout.line_height + scroll_position.y()) as u32;
1764 let (column, x_overshoot) = if let Some(line) = layout
1765 .line_layouts
1766 .get(row as usize - scroll_position.y() as usize)
1767 {
1768 if let Some(ix) = line.index_for_x(x) {
1769 (ix as u32, 0.0)
1770 } else {
1771 (line.len() as u32, 0f32.max(x - line.width()))
1772 }
1773 } else {
1774 (0, x)
1775 };
1776
1777 let mut target_point = DisplayPoint::new(row, column);
1778 let point = snapshot.clip_point(target_point, Bias::Left);
1779 *target_point.column_mut() += (x_overshoot / layout.em_advance) as u32;
1780
1781 (point, target_point)
1782 }
1783}
1784
1785#[derive(Copy, Clone, PartialEq, Eq, Debug)]
1786pub enum CursorShape {
1787 Bar,
1788 Block,
1789 Underscore,
1790 Hollow,
1791}
1792
1793impl Default for CursorShape {
1794 fn default() -> Self {
1795 CursorShape::Bar
1796 }
1797}
1798
1799#[derive(Debug)]
1800pub struct Cursor {
1801 origin: Vector2F,
1802 block_width: f32,
1803 line_height: f32,
1804 color: Color,
1805 shape: CursorShape,
1806 block_text: Option<Line>,
1807}
1808
1809impl Cursor {
1810 pub fn new(
1811 origin: Vector2F,
1812 block_width: f32,
1813 line_height: f32,
1814 color: Color,
1815 shape: CursorShape,
1816 block_text: Option<Line>,
1817 ) -> Cursor {
1818 Cursor {
1819 origin,
1820 block_width,
1821 line_height,
1822 color,
1823 shape,
1824 block_text,
1825 }
1826 }
1827
1828 pub fn bounding_rect(&self, origin: Vector2F) -> RectF {
1829 RectF::new(
1830 self.origin + origin,
1831 vec2f(self.block_width, self.line_height),
1832 )
1833 }
1834
1835 pub fn paint(&self, origin: Vector2F, cx: &mut PaintContext) {
1836 let bounds = match self.shape {
1837 CursorShape::Bar => RectF::new(self.origin + origin, vec2f(2.0, self.line_height)),
1838 CursorShape::Block | CursorShape::Hollow => RectF::new(
1839 self.origin + origin,
1840 vec2f(self.block_width, self.line_height),
1841 ),
1842 CursorShape::Underscore => RectF::new(
1843 self.origin + origin + Vector2F::new(0.0, self.line_height - 2.0),
1844 vec2f(self.block_width, 2.0),
1845 ),
1846 };
1847
1848 //Draw background or border quad
1849 if matches!(self.shape, CursorShape::Hollow) {
1850 cx.scene.push_quad(Quad {
1851 bounds,
1852 background: None,
1853 border: Border::all(1., self.color),
1854 corner_radius: 0.,
1855 });
1856 } else {
1857 cx.scene.push_quad(Quad {
1858 bounds,
1859 background: Some(self.color),
1860 border: Default::default(),
1861 corner_radius: 0.,
1862 });
1863 }
1864
1865 if let Some(block_text) = &self.block_text {
1866 block_text.paint(self.origin + origin, bounds, self.line_height, cx);
1867 }
1868 }
1869
1870 pub fn shape(&self) -> CursorShape {
1871 self.shape
1872 }
1873}
1874
1875#[derive(Debug)]
1876pub struct HighlightedRange {
1877 pub start_y: f32,
1878 pub line_height: f32,
1879 pub lines: Vec<HighlightedRangeLine>,
1880 pub color: Color,
1881 pub corner_radius: f32,
1882}
1883
1884#[derive(Debug)]
1885pub struct HighlightedRangeLine {
1886 pub start_x: f32,
1887 pub end_x: f32,
1888}
1889
1890impl HighlightedRange {
1891 pub fn paint(&self, bounds: RectF, scene: &mut Scene) {
1892 if self.lines.len() >= 2 && self.lines[0].start_x > self.lines[1].end_x {
1893 self.paint_lines(self.start_y, &self.lines[0..1], bounds, scene);
1894 self.paint_lines(
1895 self.start_y + self.line_height,
1896 &self.lines[1..],
1897 bounds,
1898 scene,
1899 );
1900 } else {
1901 self.paint_lines(self.start_y, &self.lines, bounds, scene);
1902 }
1903 }
1904
1905 fn paint_lines(
1906 &self,
1907 start_y: f32,
1908 lines: &[HighlightedRangeLine],
1909 bounds: RectF,
1910 scene: &mut Scene,
1911 ) {
1912 if lines.is_empty() {
1913 return;
1914 }
1915
1916 let mut path = PathBuilder::new();
1917 let first_line = lines.first().unwrap();
1918 let last_line = lines.last().unwrap();
1919
1920 let first_top_left = vec2f(first_line.start_x, start_y);
1921 let first_top_right = vec2f(first_line.end_x, start_y);
1922
1923 let curve_height = vec2f(0., self.corner_radius);
1924 let curve_width = |start_x: f32, end_x: f32| {
1925 let max = (end_x - start_x) / 2.;
1926 let width = if max < self.corner_radius {
1927 max
1928 } else {
1929 self.corner_radius
1930 };
1931
1932 vec2f(width, 0.)
1933 };
1934
1935 let top_curve_width = curve_width(first_line.start_x, first_line.end_x);
1936 path.reset(first_top_right - top_curve_width);
1937 path.curve_to(first_top_right + curve_height, first_top_right);
1938
1939 let mut iter = lines.iter().enumerate().peekable();
1940 while let Some((ix, line)) = iter.next() {
1941 let bottom_right = vec2f(line.end_x, start_y + (ix + 1) as f32 * self.line_height);
1942
1943 if let Some((_, next_line)) = iter.peek() {
1944 let next_top_right = vec2f(next_line.end_x, bottom_right.y());
1945
1946 match next_top_right.x().partial_cmp(&bottom_right.x()).unwrap() {
1947 Ordering::Equal => {
1948 path.line_to(bottom_right);
1949 }
1950 Ordering::Less => {
1951 let curve_width = curve_width(next_top_right.x(), bottom_right.x());
1952 path.line_to(bottom_right - curve_height);
1953 if self.corner_radius > 0. {
1954 path.curve_to(bottom_right - curve_width, bottom_right);
1955 }
1956 path.line_to(next_top_right + curve_width);
1957 if self.corner_radius > 0. {
1958 path.curve_to(next_top_right + curve_height, next_top_right);
1959 }
1960 }
1961 Ordering::Greater => {
1962 let curve_width = curve_width(bottom_right.x(), next_top_right.x());
1963 path.line_to(bottom_right - curve_height);
1964 if self.corner_radius > 0. {
1965 path.curve_to(bottom_right + curve_width, bottom_right);
1966 }
1967 path.line_to(next_top_right - curve_width);
1968 if self.corner_radius > 0. {
1969 path.curve_to(next_top_right + curve_height, next_top_right);
1970 }
1971 }
1972 }
1973 } else {
1974 let curve_width = curve_width(line.start_x, line.end_x);
1975 path.line_to(bottom_right - curve_height);
1976 if self.corner_radius > 0. {
1977 path.curve_to(bottom_right - curve_width, bottom_right);
1978 }
1979
1980 let bottom_left = vec2f(line.start_x, bottom_right.y());
1981 path.line_to(bottom_left + curve_width);
1982 if self.corner_radius > 0. {
1983 path.curve_to(bottom_left - curve_height, bottom_left);
1984 }
1985 }
1986 }
1987
1988 if first_line.start_x > last_line.start_x {
1989 let curve_width = curve_width(last_line.start_x, first_line.start_x);
1990 let second_top_left = vec2f(last_line.start_x, start_y + self.line_height);
1991 path.line_to(second_top_left + curve_height);
1992 if self.corner_radius > 0. {
1993 path.curve_to(second_top_left + curve_width, second_top_left);
1994 }
1995 let first_bottom_left = vec2f(first_line.start_x, second_top_left.y());
1996 path.line_to(first_bottom_left - curve_width);
1997 if self.corner_radius > 0. {
1998 path.curve_to(first_bottom_left - curve_height, first_bottom_left);
1999 }
2000 }
2001
2002 path.line_to(first_top_left + curve_height);
2003 if self.corner_radius > 0. {
2004 path.curve_to(first_top_left + top_curve_width, first_top_left);
2005 }
2006 path.line_to(first_top_right - top_curve_width);
2007
2008 scene.push_path(path.build(self.color, Some(bounds)));
2009 }
2010}
2011
2012pub fn scale_vertical_mouse_autoscroll_delta(delta: f32) -> f32 {
2013 delta.powf(1.5) / 100.0
2014}
2015
2016fn scale_horizontal_mouse_autoscroll_delta(delta: f32) -> f32 {
2017 delta.powf(1.2) / 300.0
2018}
2019
2020#[cfg(test)]
2021mod tests {
2022 use std::sync::Arc;
2023
2024 use super::*;
2025 use crate::{
2026 display_map::{BlockDisposition, BlockProperties},
2027 Editor, MultiBuffer,
2028 };
2029 use settings::Settings;
2030 use util::test::sample_text;
2031
2032 #[gpui::test]
2033 fn test_layout_line_numbers(cx: &mut gpui::MutableAppContext) {
2034 cx.set_global(Settings::test(cx));
2035 let buffer = MultiBuffer::build_simple(&sample_text(6, 6, 'a'), cx);
2036 let (window_id, editor) = cx.add_window(Default::default(), |cx| {
2037 Editor::new(EditorMode::Full, buffer, None, None, cx)
2038 });
2039 let element = EditorElement::new(
2040 editor.downgrade(),
2041 editor.read(cx).style(cx),
2042 CursorShape::Bar,
2043 );
2044
2045 let layouts = editor.update(cx, |editor, cx| {
2046 let snapshot = editor.snapshot(cx);
2047 let mut presenter = cx.build_presenter(window_id, 30., Default::default());
2048 let layout_cx = presenter.build_layout_context(Vector2F::zero(), false, cx);
2049 element.layout_line_numbers(0..6, &Default::default(), &snapshot, &layout_cx)
2050 });
2051 assert_eq!(layouts.len(), 6);
2052 }
2053
2054 #[gpui::test]
2055 fn test_layout_with_placeholder_text_and_blocks(cx: &mut gpui::MutableAppContext) {
2056 cx.set_global(Settings::test(cx));
2057 let buffer = MultiBuffer::build_simple("", cx);
2058 let (window_id, editor) = cx.add_window(Default::default(), |cx| {
2059 Editor::new(EditorMode::Full, buffer, None, None, cx)
2060 });
2061
2062 editor.update(cx, |editor, cx| {
2063 editor.set_placeholder_text("hello", cx);
2064 editor.insert_blocks(
2065 [BlockProperties {
2066 style: BlockStyle::Fixed,
2067 disposition: BlockDisposition::Above,
2068 height: 3,
2069 position: Anchor::min(),
2070 render: Arc::new(|_| Empty::new().boxed()),
2071 }],
2072 cx,
2073 );
2074
2075 // Blur the editor so that it displays placeholder text.
2076 cx.blur();
2077 });
2078
2079 let mut element = EditorElement::new(
2080 editor.downgrade(),
2081 editor.read(cx).style(cx),
2082 CursorShape::Bar,
2083 );
2084
2085 let mut scene = Scene::new(1.0);
2086 let mut presenter = cx.build_presenter(window_id, 30., Default::default());
2087 let mut layout_cx = presenter.build_layout_context(Vector2F::zero(), false, cx);
2088 let (size, mut state) = element.layout(
2089 SizeConstraint::new(vec2f(500., 500.), vec2f(500., 500.)),
2090 &mut layout_cx,
2091 );
2092
2093 assert_eq!(state.line_layouts.len(), 4);
2094 assert_eq!(
2095 state
2096 .line_number_layouts
2097 .iter()
2098 .map(Option::is_some)
2099 .collect::<Vec<_>>(),
2100 &[false, false, false, true]
2101 );
2102
2103 // Don't panic.
2104 let bounds = RectF::new(Default::default(), size);
2105 let mut paint_cx = presenter.build_paint_context(&mut scene, bounds.size(), cx);
2106 element.paint(bounds, bounds, &mut state, &mut paint_cx);
2107 }
2108}