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