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, MouseButtonEvent, 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/arrow_up_right_8.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(MouseButton::Left, move |_, cx| {
972 cx.dispatch_action(jump_action.clone())
973 })
974 .with_tooltip::<JumpIcon, _>(
975 *key,
976 "Jump to Buffer".to_string(),
977 Some(Box::new(crate::OpenExcerpts)),
978 tooltip_style.clone(),
979 cx,
980 )
981 .aligned()
982 .flex_float()
983 .boxed()
984 })
985 });
986
987 if *starts_new_buffer {
988 let style = &self.style.diagnostic_path_header;
989 let font_size =
990 (style.text_scale_factor * self.style.text.font_size).round();
991
992 let mut filename = None;
993 let mut parent_path = None;
994 if let Some(file) = buffer.file() {
995 let path = file.path();
996 filename = path.file_name().map(|f| f.to_string_lossy().to_string());
997 parent_path =
998 path.parent().map(|p| p.to_string_lossy().to_string() + "/");
999 }
1000
1001 Flex::row()
1002 .with_child(
1003 Label::new(
1004 filename.unwrap_or_else(|| "untitled".to_string()),
1005 style.filename.text.clone().with_font_size(font_size),
1006 )
1007 .contained()
1008 .with_style(style.filename.container)
1009 .aligned()
1010 .boxed(),
1011 )
1012 .with_children(parent_path.map(|path| {
1013 Label::new(path, style.path.text.clone().with_font_size(font_size))
1014 .contained()
1015 .with_style(style.path.container)
1016 .aligned()
1017 .boxed()
1018 }))
1019 .with_children(jump_icon)
1020 .contained()
1021 .with_style(style.container)
1022 .with_padding_left(gutter_padding)
1023 .with_padding_right(gutter_padding)
1024 .expanded()
1025 .named("path header block")
1026 } else {
1027 let text_style = self.style.text.clone();
1028 Flex::row()
1029 .with_child(Label::new("…".to_string(), text_style).boxed())
1030 .with_children(jump_icon)
1031 .contained()
1032 .with_padding_left(gutter_padding)
1033 .with_padding_right(gutter_padding)
1034 .expanded()
1035 .named("collapsed context")
1036 }
1037 }
1038 };
1039
1040 element.layout(
1041 SizeConstraint {
1042 min: Vector2F::zero(),
1043 max: vec2f(width, block.height() as f32 * line_height),
1044 },
1045 cx,
1046 );
1047 element
1048 };
1049
1050 let mut fixed_block_max_width = 0f32;
1051 let mut blocks = Vec::new();
1052 for (row, block) in fixed_blocks {
1053 let element = render_block(block, f32::INFINITY);
1054 fixed_block_max_width = fixed_block_max_width.max(element.size().x() + em_width);
1055 blocks.push(BlockLayout {
1056 row,
1057 element,
1058 style: BlockStyle::Fixed,
1059 });
1060 }
1061 for (row, block) in non_fixed_blocks {
1062 let style = match block {
1063 TransformBlock::Custom(block) => block.style(),
1064 TransformBlock::ExcerptHeader { .. } => BlockStyle::Sticky,
1065 };
1066 let width = match style {
1067 BlockStyle::Sticky => editor_width,
1068 BlockStyle::Flex => editor_width
1069 .max(fixed_block_max_width)
1070 .max(gutter_width + scroll_width),
1071 BlockStyle::Fixed => unreachable!(),
1072 };
1073 let element = render_block(block, width);
1074 blocks.push(BlockLayout {
1075 row,
1076 element,
1077 style,
1078 });
1079 }
1080 (
1081 scroll_width.max(fixed_block_max_width - gutter_width),
1082 blocks,
1083 )
1084 }
1085}
1086
1087impl Element for EditorElement {
1088 type LayoutState = LayoutState;
1089 type PaintState = PaintState;
1090
1091 fn layout(
1092 &mut self,
1093 constraint: SizeConstraint,
1094 cx: &mut LayoutContext,
1095 ) -> (Vector2F, Self::LayoutState) {
1096 let mut size = constraint.max;
1097 if size.x().is_infinite() {
1098 unimplemented!("we don't yet handle an infinite width constraint on buffer elements");
1099 }
1100
1101 let snapshot = self.snapshot(cx.app);
1102 let style = self.style.clone();
1103 let line_height = style.text.line_height(cx.font_cache);
1104
1105 let gutter_padding;
1106 let gutter_width;
1107 let gutter_margin;
1108 if snapshot.mode == EditorMode::Full {
1109 gutter_padding = style.text.em_width(cx.font_cache) * style.gutter_padding_factor;
1110 gutter_width = self.max_line_number_width(&snapshot, cx) + gutter_padding * 2.0;
1111 gutter_margin = -style.text.descent(cx.font_cache);
1112 } else {
1113 gutter_padding = 0.0;
1114 gutter_width = 0.0;
1115 gutter_margin = 0.0;
1116 };
1117
1118 let text_width = size.x() - gutter_width;
1119 let em_width = style.text.em_width(cx.font_cache);
1120 let em_advance = style.text.em_advance(cx.font_cache);
1121 let overscroll = vec2f(em_width, 0.);
1122 let snapshot = self.update_view(cx.app, |view, cx| {
1123 let wrap_width = match view.soft_wrap_mode(cx) {
1124 SoftWrap::None => Some((MAX_LINE_LEN / 2) as f32 * em_advance),
1125 SoftWrap::EditorWidth => {
1126 Some(text_width - gutter_margin - overscroll.x() - em_width)
1127 }
1128 SoftWrap::Column(column) => Some(column as f32 * em_advance),
1129 };
1130
1131 if view.set_wrap_width(wrap_width, cx) {
1132 view.snapshot(cx)
1133 } else {
1134 snapshot
1135 }
1136 });
1137
1138 let scroll_height = (snapshot.max_point().row() + 1) as f32 * line_height;
1139 if let EditorMode::AutoHeight { max_lines } = snapshot.mode {
1140 size.set_y(
1141 scroll_height
1142 .min(constraint.max_along(Axis::Vertical))
1143 .max(constraint.min_along(Axis::Vertical))
1144 .min(line_height * max_lines as f32),
1145 )
1146 } else if let EditorMode::SingleLine = snapshot.mode {
1147 size.set_y(
1148 line_height
1149 .min(constraint.max_along(Axis::Vertical))
1150 .max(constraint.min_along(Axis::Vertical)),
1151 )
1152 } else if size.y().is_infinite() {
1153 size.set_y(scroll_height);
1154 }
1155 let gutter_size = vec2f(gutter_width, size.y());
1156 let text_size = vec2f(text_width, size.y());
1157
1158 let (autoscroll_horizontally, mut snapshot) = self.update_view(cx.app, |view, cx| {
1159 let autoscroll_horizontally = view.autoscroll_vertically(size.y(), line_height, cx);
1160 let snapshot = view.snapshot(cx);
1161 (autoscroll_horizontally, snapshot)
1162 });
1163
1164 let scroll_position = snapshot.scroll_position();
1165 let start_row = scroll_position.y() as u32;
1166 let scroll_top = scroll_position.y() * line_height;
1167
1168 // Add 1 to ensure selections bleed off screen
1169 let end_row = 1 + cmp::min(
1170 ((scroll_top + size.y()) / line_height).ceil() as u32,
1171 snapshot.max_point().row(),
1172 );
1173
1174 let start_anchor = if start_row == 0 {
1175 Anchor::min()
1176 } else {
1177 snapshot
1178 .buffer_snapshot
1179 .anchor_before(DisplayPoint::new(start_row, 0).to_offset(&snapshot, Bias::Left))
1180 };
1181 let end_anchor = if end_row > snapshot.max_point().row() {
1182 Anchor::max()
1183 } else {
1184 snapshot
1185 .buffer_snapshot
1186 .anchor_before(DisplayPoint::new(end_row, 0).to_offset(&snapshot, Bias::Right))
1187 };
1188
1189 let mut selections: Vec<(ReplicaId, Vec<SelectionLayout>)> = Vec::new();
1190 let mut active_rows = BTreeMap::new();
1191 let mut highlighted_rows = None;
1192 let mut highlighted_ranges = Vec::new();
1193 self.update_view(cx.app, |view, cx| {
1194 let display_map = view.display_map.update(cx, |map, cx| map.snapshot(cx));
1195
1196 highlighted_rows = view.highlighted_rows();
1197 let theme = cx.global::<Settings>().theme.as_ref();
1198 highlighted_ranges = view.background_highlights_in_range(
1199 start_anchor.clone()..end_anchor.clone(),
1200 &display_map,
1201 theme,
1202 );
1203
1204 let mut remote_selections = HashMap::default();
1205 for (replica_id, line_mode, selection) in display_map
1206 .buffer_snapshot
1207 .remote_selections_in_range(&(start_anchor.clone()..end_anchor.clone()))
1208 {
1209 // The local selections match the leader's selections.
1210 if Some(replica_id) == view.leader_replica_id {
1211 continue;
1212 }
1213 remote_selections
1214 .entry(replica_id)
1215 .or_insert(Vec::new())
1216 .push(SelectionLayout::new(selection, line_mode, &display_map));
1217 }
1218 selections.extend(remote_selections);
1219
1220 if view.show_local_selections {
1221 let mut local_selections = view
1222 .selections
1223 .disjoint_in_range(start_anchor..end_anchor, cx);
1224 local_selections.extend(view.selections.pending(cx));
1225 for selection in &local_selections {
1226 let is_empty = selection.start == selection.end;
1227 let selection_start = snapshot.prev_line_boundary(selection.start).1;
1228 let selection_end = snapshot.next_line_boundary(selection.end).1;
1229 for row in cmp::max(selection_start.row(), start_row)
1230 ..=cmp::min(selection_end.row(), end_row)
1231 {
1232 let contains_non_empty_selection =
1233 active_rows.entry(row).or_insert(!is_empty);
1234 *contains_non_empty_selection |= !is_empty;
1235 }
1236 }
1237
1238 // Render the local selections in the leader's color when following.
1239 let local_replica_id = view.leader_replica_id.unwrap_or(view.replica_id(cx));
1240
1241 selections.push((
1242 local_replica_id,
1243 local_selections
1244 .into_iter()
1245 .map(|selection| {
1246 SelectionLayout::new(selection, view.selections.line_mode, &display_map)
1247 })
1248 .collect(),
1249 ));
1250 }
1251 });
1252
1253 let line_number_layouts =
1254 self.layout_line_numbers(start_row..end_row, &active_rows, &snapshot, cx);
1255
1256 let mut max_visible_line_width = 0.0;
1257 let line_layouts = self.layout_lines(start_row..end_row, &snapshot, cx);
1258 for line in &line_layouts {
1259 if line.width() > max_visible_line_width {
1260 max_visible_line_width = line.width();
1261 }
1262 }
1263
1264 let style = self.style.clone();
1265 let longest_line_width = layout_line(
1266 snapshot.longest_row(),
1267 &snapshot,
1268 &style,
1269 cx.text_layout_cache,
1270 )
1271 .width();
1272 let scroll_width = longest_line_width.max(max_visible_line_width) + overscroll.x();
1273 let em_width = style.text.em_width(cx.font_cache);
1274 let (scroll_width, blocks) = self.layout_blocks(
1275 start_row..end_row,
1276 &snapshot,
1277 size.x(),
1278 scroll_width,
1279 gutter_padding,
1280 gutter_width,
1281 em_width,
1282 gutter_width + gutter_margin,
1283 line_height,
1284 &style,
1285 &line_layouts,
1286 cx,
1287 );
1288
1289 let max_row = snapshot.max_point().row();
1290 let scroll_max = vec2f(
1291 ((scroll_width - text_size.x()) / em_width).max(0.0),
1292 max_row.saturating_sub(1) as f32,
1293 );
1294
1295 self.update_view(cx.app, |view, cx| {
1296 let clamped = view.clamp_scroll_left(scroll_max.x());
1297 let autoscrolled;
1298 if autoscroll_horizontally {
1299 autoscrolled = view.autoscroll_horizontally(
1300 start_row,
1301 text_size.x(),
1302 scroll_width,
1303 em_width,
1304 &line_layouts,
1305 cx,
1306 );
1307 } else {
1308 autoscrolled = false;
1309 }
1310
1311 if clamped || autoscrolled {
1312 snapshot = view.snapshot(cx);
1313 }
1314 });
1315
1316 let mut context_menu = None;
1317 let mut code_actions_indicator = None;
1318 let mut hover = None;
1319 cx.render(&self.view.upgrade(cx).unwrap(), |view, cx| {
1320 let newest_selection_head = view
1321 .selections
1322 .newest::<usize>(cx)
1323 .head()
1324 .to_display_point(&snapshot);
1325
1326 let style = view.style(cx);
1327 if (start_row..end_row).contains(&newest_selection_head.row()) {
1328 if view.context_menu_visible() {
1329 context_menu =
1330 view.render_context_menu(newest_selection_head, style.clone(), cx);
1331 }
1332
1333 code_actions_indicator = view
1334 .render_code_actions_indicator(&style, cx)
1335 .map(|indicator| (newest_selection_head.row(), indicator));
1336 }
1337
1338 hover = view.hover_state.popover.clone().and_then(|hover| {
1339 let (point, rendered) = hover.render(&snapshot, style.clone(), cx);
1340 if point.row() >= snapshot.scroll_position().y() as u32 {
1341 if line_layouts.len() > (point.row() - start_row) as usize {
1342 return Some((point, rendered));
1343 }
1344 }
1345
1346 None
1347 });
1348 });
1349
1350 if let Some((_, context_menu)) = context_menu.as_mut() {
1351 context_menu.layout(
1352 SizeConstraint {
1353 min: Vector2F::zero(),
1354 max: vec2f(
1355 cx.window_size.x() * 0.7,
1356 (12. * line_height).min((size.y() - line_height) / 2.),
1357 ),
1358 },
1359 cx,
1360 );
1361 }
1362
1363 if let Some((_, indicator)) = code_actions_indicator.as_mut() {
1364 indicator.layout(
1365 SizeConstraint::strict_along(Axis::Vertical, line_height * 0.618),
1366 cx,
1367 );
1368 }
1369
1370 if let Some((_, hover)) = hover.as_mut() {
1371 hover.layout(
1372 SizeConstraint {
1373 min: Vector2F::zero(),
1374 max: vec2f(
1375 (120. * em_width) // Default size
1376 .min(size.x() / 2.) // Shrink to half of the editor width
1377 .max(20. * em_width), // Apply minimum width of 20 characters
1378 (16. * line_height) // Default size
1379 .min(size.y() / 2.) // Shrink to half of the editor height
1380 .max(4. * line_height), // Apply minimum height of 4 lines
1381 ),
1382 },
1383 cx,
1384 );
1385 }
1386
1387 (
1388 size,
1389 LayoutState {
1390 size,
1391 scroll_max,
1392 gutter_size,
1393 gutter_padding,
1394 text_size,
1395 gutter_margin,
1396 snapshot,
1397 active_rows,
1398 highlighted_rows,
1399 highlighted_ranges,
1400 line_layouts,
1401 line_number_layouts,
1402 blocks,
1403 line_height,
1404 em_width,
1405 em_advance,
1406 selections,
1407 context_menu,
1408 code_actions_indicator,
1409 hover,
1410 },
1411 )
1412 }
1413
1414 fn paint(
1415 &mut self,
1416 bounds: RectF,
1417 visible_bounds: RectF,
1418 layout: &mut Self::LayoutState,
1419 cx: &mut PaintContext,
1420 ) -> Self::PaintState {
1421 cx.scene.push_layer(Some(bounds));
1422
1423 let gutter_bounds = RectF::new(bounds.origin(), layout.gutter_size);
1424 let text_bounds = RectF::new(
1425 bounds.origin() + vec2f(layout.gutter_size.x(), 0.0),
1426 layout.text_size,
1427 );
1428
1429 let mut paint_state = PaintState {
1430 bounds,
1431 gutter_bounds,
1432 text_bounds,
1433 context_menu_bounds: None,
1434 hover_bounds: None,
1435 };
1436
1437 self.paint_background(gutter_bounds, text_bounds, layout, cx);
1438 if layout.gutter_size.x() > 0. {
1439 self.paint_gutter(gutter_bounds, visible_bounds, layout, cx);
1440 }
1441 self.paint_text(text_bounds, visible_bounds, layout, &mut paint_state, cx);
1442
1443 if !layout.blocks.is_empty() {
1444 cx.scene.push_layer(Some(bounds));
1445 self.paint_blocks(bounds, visible_bounds, layout, cx);
1446 cx.scene.pop_layer();
1447 }
1448
1449 cx.scene.pop_layer();
1450
1451 paint_state
1452 }
1453
1454 fn dispatch_event(
1455 &mut self,
1456 event: &Event,
1457 _: RectF,
1458 _: RectF,
1459 layout: &mut LayoutState,
1460 paint: &mut PaintState,
1461 cx: &mut EventContext,
1462 ) -> bool {
1463 if let Some((_, context_menu)) = &mut layout.context_menu {
1464 if context_menu.dispatch_event(event, cx) {
1465 return true;
1466 }
1467 }
1468
1469 if let Some((_, indicator)) = &mut layout.code_actions_indicator {
1470 if indicator.dispatch_event(event, cx) {
1471 return true;
1472 }
1473 }
1474
1475 if let Some((_, hover)) = &mut layout.hover {
1476 if hover.dispatch_event(event, cx) {
1477 return true;
1478 }
1479 }
1480
1481 for block in &mut layout.blocks {
1482 if block.element.dispatch_event(event, cx) {
1483 return true;
1484 }
1485 }
1486
1487 match event {
1488 Event::MouseDown(MouseButtonEvent {
1489 button: MouseButton::Left,
1490 position,
1491 cmd,
1492 alt,
1493 shift,
1494 click_count,
1495 ..
1496 }) => self.mouse_down(
1497 *position,
1498 *cmd,
1499 *alt,
1500 *shift,
1501 *click_count,
1502 layout,
1503 paint,
1504 cx,
1505 ),
1506 Event::MouseDown(MouseButtonEvent {
1507 button: MouseButton::Right,
1508 position,
1509 ..
1510 }) => self.mouse_right_down(*position, layout, paint, cx),
1511 Event::MouseUp(MouseButtonEvent {
1512 button: MouseButton::Left,
1513 position,
1514 ..
1515 }) => self.mouse_up(*position, cx),
1516 Event::MouseMoved(MouseMovedEvent {
1517 pressed_button: Some(MouseButton::Left),
1518 position,
1519 ..
1520 }) => self.mouse_dragged(*position, layout, paint, cx),
1521 Event::ScrollWheel(ScrollWheelEvent {
1522 position,
1523 delta,
1524 precise,
1525 }) => self.scroll(*position, *delta, *precise, layout, paint, cx),
1526 Event::KeyDown(KeyDownEvent { input, .. }) => self.key_down(input.as_deref(), cx),
1527 Event::ModifiersChanged(ModifiersChangedEvent { cmd, .. }) => {
1528 self.modifiers_changed(*cmd, cx)
1529 }
1530 Event::MouseMoved(MouseMovedEvent { position, cmd, .. }) => {
1531 self.mouse_moved(*position, *cmd, layout, paint, cx)
1532 }
1533
1534 _ => false,
1535 }
1536 }
1537
1538 fn debug(
1539 &self,
1540 bounds: RectF,
1541 _: &Self::LayoutState,
1542 _: &Self::PaintState,
1543 _: &gpui::DebugContext,
1544 ) -> json::Value {
1545 json!({
1546 "type": "BufferElement",
1547 "bounds": bounds.to_json()
1548 })
1549 }
1550}
1551
1552pub struct LayoutState {
1553 size: Vector2F,
1554 scroll_max: Vector2F,
1555 gutter_size: Vector2F,
1556 gutter_padding: f32,
1557 gutter_margin: f32,
1558 text_size: Vector2F,
1559 snapshot: EditorSnapshot,
1560 active_rows: BTreeMap<u32, bool>,
1561 highlighted_rows: Option<Range<u32>>,
1562 line_layouts: Vec<text_layout::Line>,
1563 line_number_layouts: Vec<Option<text_layout::Line>>,
1564 blocks: Vec<BlockLayout>,
1565 line_height: f32,
1566 em_width: f32,
1567 em_advance: f32,
1568 highlighted_ranges: Vec<(Range<DisplayPoint>, Color)>,
1569 selections: Vec<(ReplicaId, Vec<SelectionLayout>)>,
1570 context_menu: Option<(DisplayPoint, ElementBox)>,
1571 code_actions_indicator: Option<(u32, ElementBox)>,
1572 hover: Option<(DisplayPoint, ElementBox)>,
1573}
1574
1575struct BlockLayout {
1576 row: u32,
1577 element: ElementBox,
1578 style: BlockStyle,
1579}
1580
1581fn layout_line(
1582 row: u32,
1583 snapshot: &EditorSnapshot,
1584 style: &EditorStyle,
1585 layout_cache: &TextLayoutCache,
1586) -> text_layout::Line {
1587 let mut line = snapshot.line(row);
1588
1589 if line.len() > MAX_LINE_LEN {
1590 let mut len = MAX_LINE_LEN;
1591 while !line.is_char_boundary(len) {
1592 len -= 1;
1593 }
1594
1595 line.truncate(len);
1596 }
1597
1598 layout_cache.layout_str(
1599 &line,
1600 style.text.font_size,
1601 &[(
1602 snapshot.line_len(row) as usize,
1603 RunStyle {
1604 font_id: style.text.font_id,
1605 color: Color::black(),
1606 underline: Default::default(),
1607 },
1608 )],
1609 )
1610}
1611
1612pub struct PaintState {
1613 bounds: RectF,
1614 gutter_bounds: RectF,
1615 text_bounds: RectF,
1616 context_menu_bounds: Option<RectF>,
1617 hover_bounds: Option<RectF>,
1618}
1619
1620impl PaintState {
1621 /// Returns two display points. The first is the nearest valid
1622 /// position in the current buffer and the second is the distance to the
1623 /// nearest valid position if there was overshoot.
1624 fn point_for_position(
1625 &self,
1626 snapshot: &EditorSnapshot,
1627 layout: &LayoutState,
1628 position: Vector2F,
1629 ) -> (DisplayPoint, DisplayPoint) {
1630 let scroll_position = snapshot.scroll_position();
1631 let position = position - self.text_bounds.origin();
1632 let y = position.y().max(0.0).min(layout.size.y());
1633 let row = ((y / layout.line_height) + scroll_position.y()) as u32;
1634 let row_overshoot = row.saturating_sub(snapshot.max_point().row());
1635 let row = cmp::min(row, snapshot.max_point().row());
1636 let line = &layout.line_layouts[(row - scroll_position.y() as u32) as usize];
1637 let x = position.x() + (scroll_position.x() * layout.em_width);
1638
1639 let column = if x >= 0.0 {
1640 line.index_for_x(x)
1641 .map(|ix| ix as u32)
1642 .unwrap_or_else(|| snapshot.line_len(row))
1643 } else {
1644 0
1645 };
1646 let column_overshoot = (0f32.max(x - line.width()) / layout.em_advance) as u32;
1647
1648 (
1649 DisplayPoint::new(row, column),
1650 DisplayPoint::new(row_overshoot, column_overshoot),
1651 )
1652 }
1653}
1654
1655#[derive(Copy, Clone, PartialEq, Eq, Debug)]
1656pub enum CursorShape {
1657 Bar,
1658 Block,
1659 Underscore,
1660}
1661
1662impl Default for CursorShape {
1663 fn default() -> Self {
1664 CursorShape::Bar
1665 }
1666}
1667
1668#[derive(Debug)]
1669pub struct Cursor {
1670 origin: Vector2F,
1671 block_width: f32,
1672 line_height: f32,
1673 color: Color,
1674 shape: CursorShape,
1675 block_text: Option<Line>,
1676}
1677
1678impl Cursor {
1679 pub fn new(
1680 origin: Vector2F,
1681 block_width: f32,
1682 line_height: f32,
1683 color: Color,
1684 shape: CursorShape,
1685 block_text: Option<Line>,
1686 ) -> Cursor {
1687 Cursor {
1688 origin,
1689 block_width,
1690 line_height,
1691 color,
1692 shape,
1693 block_text,
1694 }
1695 }
1696
1697 pub fn paint(&self, origin: Vector2F, cx: &mut PaintContext) {
1698 let bounds = match self.shape {
1699 CursorShape::Bar => RectF::new(self.origin + origin, vec2f(2.0, self.line_height)),
1700 CursorShape::Block => RectF::new(
1701 self.origin + origin,
1702 vec2f(self.block_width, self.line_height),
1703 ),
1704 CursorShape::Underscore => RectF::new(
1705 self.origin + origin + Vector2F::new(0.0, self.line_height - 2.0),
1706 vec2f(self.block_width, 2.0),
1707 ),
1708 };
1709
1710 cx.scene.push_quad(Quad {
1711 bounds,
1712 background: Some(self.color),
1713 border: Border::new(0., Color::black()),
1714 corner_radius: 0.,
1715 });
1716
1717 if let Some(block_text) = &self.block_text {
1718 block_text.paint(self.origin + origin, bounds, self.line_height, cx);
1719 }
1720 }
1721}
1722
1723#[derive(Debug)]
1724pub struct HighlightedRange {
1725 pub start_y: f32,
1726 pub line_height: f32,
1727 pub lines: Vec<HighlightedRangeLine>,
1728 pub color: Color,
1729 pub corner_radius: f32,
1730}
1731
1732#[derive(Debug)]
1733pub struct HighlightedRangeLine {
1734 pub start_x: f32,
1735 pub end_x: f32,
1736}
1737
1738impl HighlightedRange {
1739 pub fn paint(&self, bounds: RectF, scene: &mut Scene) {
1740 if self.lines.len() >= 2 && self.lines[0].start_x > self.lines[1].end_x {
1741 self.paint_lines(self.start_y, &self.lines[0..1], bounds, scene);
1742 self.paint_lines(
1743 self.start_y + self.line_height,
1744 &self.lines[1..],
1745 bounds,
1746 scene,
1747 );
1748 } else {
1749 self.paint_lines(self.start_y, &self.lines, bounds, scene);
1750 }
1751 }
1752
1753 fn paint_lines(
1754 &self,
1755 start_y: f32,
1756 lines: &[HighlightedRangeLine],
1757 bounds: RectF,
1758 scene: &mut Scene,
1759 ) {
1760 if lines.is_empty() {
1761 return;
1762 }
1763
1764 let mut path = PathBuilder::new();
1765 let first_line = lines.first().unwrap();
1766 let last_line = lines.last().unwrap();
1767
1768 let first_top_left = vec2f(first_line.start_x, start_y);
1769 let first_top_right = vec2f(first_line.end_x, start_y);
1770
1771 let curve_height = vec2f(0., self.corner_radius);
1772 let curve_width = |start_x: f32, end_x: f32| {
1773 let max = (end_x - start_x) / 2.;
1774 let width = if max < self.corner_radius {
1775 max
1776 } else {
1777 self.corner_radius
1778 };
1779
1780 vec2f(width, 0.)
1781 };
1782
1783 let top_curve_width = curve_width(first_line.start_x, first_line.end_x);
1784 path.reset(first_top_right - top_curve_width);
1785 path.curve_to(first_top_right + curve_height, first_top_right);
1786
1787 let mut iter = lines.iter().enumerate().peekable();
1788 while let Some((ix, line)) = iter.next() {
1789 let bottom_right = vec2f(line.end_x, start_y + (ix + 1) as f32 * self.line_height);
1790
1791 if let Some((_, next_line)) = iter.peek() {
1792 let next_top_right = vec2f(next_line.end_x, bottom_right.y());
1793
1794 match next_top_right.x().partial_cmp(&bottom_right.x()).unwrap() {
1795 Ordering::Equal => {
1796 path.line_to(bottom_right);
1797 }
1798 Ordering::Less => {
1799 let curve_width = curve_width(next_top_right.x(), bottom_right.x());
1800 path.line_to(bottom_right - curve_height);
1801 if self.corner_radius > 0. {
1802 path.curve_to(bottom_right - curve_width, bottom_right);
1803 }
1804 path.line_to(next_top_right + curve_width);
1805 if self.corner_radius > 0. {
1806 path.curve_to(next_top_right + curve_height, next_top_right);
1807 }
1808 }
1809 Ordering::Greater => {
1810 let curve_width = curve_width(bottom_right.x(), next_top_right.x());
1811 path.line_to(bottom_right - curve_height);
1812 if self.corner_radius > 0. {
1813 path.curve_to(bottom_right + curve_width, bottom_right);
1814 }
1815 path.line_to(next_top_right - curve_width);
1816 if self.corner_radius > 0. {
1817 path.curve_to(next_top_right + curve_height, next_top_right);
1818 }
1819 }
1820 }
1821 } else {
1822 let curve_width = curve_width(line.start_x, line.end_x);
1823 path.line_to(bottom_right - curve_height);
1824 if self.corner_radius > 0. {
1825 path.curve_to(bottom_right - curve_width, bottom_right);
1826 }
1827
1828 let bottom_left = vec2f(line.start_x, bottom_right.y());
1829 path.line_to(bottom_left + curve_width);
1830 if self.corner_radius > 0. {
1831 path.curve_to(bottom_left - curve_height, bottom_left);
1832 }
1833 }
1834 }
1835
1836 if first_line.start_x > last_line.start_x {
1837 let curve_width = curve_width(last_line.start_x, first_line.start_x);
1838 let second_top_left = vec2f(last_line.start_x, start_y + self.line_height);
1839 path.line_to(second_top_left + curve_height);
1840 if self.corner_radius > 0. {
1841 path.curve_to(second_top_left + curve_width, second_top_left);
1842 }
1843 let first_bottom_left = vec2f(first_line.start_x, second_top_left.y());
1844 path.line_to(first_bottom_left - curve_width);
1845 if self.corner_radius > 0. {
1846 path.curve_to(first_bottom_left - curve_height, first_bottom_left);
1847 }
1848 }
1849
1850 path.line_to(first_top_left + curve_height);
1851 if self.corner_radius > 0. {
1852 path.curve_to(first_top_left + top_curve_width, first_top_left);
1853 }
1854 path.line_to(first_top_right - top_curve_width);
1855
1856 scene.push_path(path.build(self.color, Some(bounds)));
1857 }
1858}
1859
1860fn scale_vertical_mouse_autoscroll_delta(delta: f32) -> f32 {
1861 delta.powf(1.5) / 100.0
1862}
1863
1864fn scale_horizontal_mouse_autoscroll_delta(delta: f32) -> f32 {
1865 delta.powf(1.2) / 300.0
1866}
1867
1868#[cfg(test)]
1869mod tests {
1870 use std::sync::Arc;
1871
1872 use super::*;
1873 use crate::{
1874 display_map::{BlockDisposition, BlockProperties},
1875 Editor, MultiBuffer,
1876 };
1877 use settings::Settings;
1878 use util::test::sample_text;
1879
1880 #[gpui::test]
1881 fn test_layout_line_numbers(cx: &mut gpui::MutableAppContext) {
1882 cx.set_global(Settings::test(cx));
1883 let buffer = MultiBuffer::build_simple(&sample_text(6, 6, 'a'), cx);
1884 let (window_id, editor) = cx.add_window(Default::default(), |cx| {
1885 Editor::new(EditorMode::Full, buffer, None, None, cx)
1886 });
1887 let element = EditorElement::new(
1888 editor.downgrade(),
1889 editor.read(cx).style(cx),
1890 CursorShape::Bar,
1891 );
1892
1893 let layouts = editor.update(cx, |editor, cx| {
1894 let snapshot = editor.snapshot(cx);
1895 let mut presenter = cx.build_presenter(window_id, 30.);
1896 let mut layout_cx = presenter.build_layout_context(Vector2F::zero(), false, cx);
1897 element.layout_line_numbers(0..6, &Default::default(), &snapshot, &mut layout_cx)
1898 });
1899 assert_eq!(layouts.len(), 6);
1900 }
1901
1902 #[gpui::test]
1903 fn test_layout_with_placeholder_text_and_blocks(cx: &mut gpui::MutableAppContext) {
1904 cx.set_global(Settings::test(cx));
1905 let buffer = MultiBuffer::build_simple("", cx);
1906 let (window_id, editor) = cx.add_window(Default::default(), |cx| {
1907 Editor::new(EditorMode::Full, buffer, None, None, cx)
1908 });
1909
1910 editor.update(cx, |editor, cx| {
1911 editor.set_placeholder_text("hello", cx);
1912 editor.insert_blocks(
1913 [BlockProperties {
1914 style: BlockStyle::Fixed,
1915 disposition: BlockDisposition::Above,
1916 height: 3,
1917 position: Anchor::min(),
1918 render: Arc::new(|_| Empty::new().boxed()),
1919 }],
1920 cx,
1921 );
1922
1923 // Blur the editor so that it displays placeholder text.
1924 cx.blur();
1925 });
1926
1927 let mut element = EditorElement::new(
1928 editor.downgrade(),
1929 editor.read(cx).style(cx),
1930 CursorShape::Bar,
1931 );
1932
1933 let mut scene = Scene::new(1.0);
1934 let mut presenter = cx.build_presenter(window_id, 30.);
1935 let mut layout_cx = presenter.build_layout_context(Vector2F::zero(), false, cx);
1936 let (size, mut state) = element.layout(
1937 SizeConstraint::new(vec2f(500., 500.), vec2f(500., 500.)),
1938 &mut layout_cx,
1939 );
1940
1941 assert_eq!(state.line_layouts.len(), 4);
1942 assert_eq!(
1943 state
1944 .line_number_layouts
1945 .iter()
1946 .map(Option::is_some)
1947 .collect::<Vec<_>>(),
1948 &[false, false, false, true]
1949 );
1950
1951 // Don't panic.
1952 let bounds = RectF::new(Default::default(), size);
1953 let mut paint_cx = presenter.build_paint_context(&mut scene, bounds.size(), cx);
1954 element.paint(bounds, bounds, &mut state, &mut paint_cx);
1955 }
1956}