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