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 matches!(self.cursor_shape, CursorShape::Block) {
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: content_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(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
556 let cursor_row_layout = &layout.line_layouts[(position.row() - start_row) as usize];
557 let x = cursor_row_layout.x_for_index(position.column() as usize) - scroll_left;
558 let y = (position.row() + 1) as f32 * layout.line_height - scroll_top;
559 let mut list_origin = content_origin + vec2f(x, y);
560 let list_width = context_menu.size().x();
561 let list_height = context_menu.size().y();
562
563 // Snap the right edge of the list to the right edge of the window if
564 // its horizontal bounds overflow.
565 if list_origin.x() + list_width > cx.window_size.x() {
566 list_origin.set_x((cx.window_size.x() - list_width).max(0.));
567 }
568
569 if list_origin.y() + list_height > bounds.max_y() {
570 list_origin.set_y(list_origin.y() - layout.line_height - list_height);
571 }
572
573 context_menu.paint(
574 list_origin,
575 RectF::from_points(Vector2F::zero(), vec2f(f32::MAX, f32::MAX)), // Let content bleed outside of editor
576 cx,
577 );
578
579 paint.context_menu_bounds = Some(RectF::new(list_origin, context_menu.size()));
580
581 cx.scene.pop_stacking_context();
582 }
583
584 if let Some((position, hover_popover)) = layout.hover.as_mut() {
585 cx.scene.push_stacking_context(None);
586
587 // This is safe because we check on layout whether the required row is available
588 let hovered_row_layout = &layout.line_layouts[(position.row() - start_row) as usize];
589 let size = hover_popover.size();
590 let x = hovered_row_layout.x_for_index(position.column() as usize) - scroll_left;
591 let y = position.row() as f32 * layout.line_height - scroll_top - size.y();
592 let mut popover_origin = content_origin + vec2f(x, y);
593
594 if popover_origin.y() < 0.0 {
595 popover_origin.set_y(popover_origin.y() + layout.line_height + size.y());
596 }
597
598 let x_out_of_bounds = bounds.max_x() - (popover_origin.x() + size.x());
599 if x_out_of_bounds < 0.0 {
600 popover_origin.set_x(popover_origin.x() + x_out_of_bounds);
601 }
602
603 hover_popover.paint(
604 popover_origin,
605 RectF::from_points(Vector2F::zero(), vec2f(f32::MAX, f32::MAX)), // Let content bleed outside of editor
606 cx,
607 );
608
609 paint.hover_bounds = Some(
610 RectF::new(popover_origin, hover_popover.size()).dilate(Vector2F::new(0., 5.)),
611 );
612
613 cx.scene.pop_stacking_context();
614 }
615
616 cx.scene.pop_layer();
617 }
618
619 fn paint_highlighted_range(
620 &self,
621 range: Range<DisplayPoint>,
622 start_row: u32,
623 end_row: u32,
624 color: Color,
625 corner_radius: f32,
626 line_end_overshoot: f32,
627 layout: &LayoutState,
628 content_origin: Vector2F,
629 scroll_top: f32,
630 scroll_left: f32,
631 bounds: RectF,
632 cx: &mut PaintContext,
633 ) {
634 if range.start != range.end {
635 let row_range = if range.end.column() == 0 {
636 cmp::max(range.start.row(), start_row)..cmp::min(range.end.row(), end_row)
637 } else {
638 cmp::max(range.start.row(), start_row)..cmp::min(range.end.row() + 1, end_row)
639 };
640
641 let highlighted_range = HighlightedRange {
642 color,
643 line_height: layout.line_height,
644 corner_radius,
645 start_y: content_origin.y() + row_range.start as f32 * layout.line_height
646 - scroll_top,
647 lines: row_range
648 .into_iter()
649 .map(|row| {
650 let line_layout = &layout.line_layouts[(row - start_row) as usize];
651 HighlightedRangeLine {
652 start_x: if row == range.start.row() {
653 content_origin.x()
654 + line_layout.x_for_index(range.start.column() as usize)
655 - scroll_left
656 } else {
657 content_origin.x() - scroll_left
658 },
659 end_x: if row == range.end.row() {
660 content_origin.x()
661 + line_layout.x_for_index(range.end.column() as usize)
662 - scroll_left
663 } else {
664 content_origin.x() + line_layout.width() + line_end_overshoot
665 - scroll_left
666 },
667 }
668 })
669 .collect(),
670 };
671
672 highlighted_range.paint(bounds, cx.scene);
673 }
674 }
675
676 fn paint_blocks(
677 &mut self,
678 bounds: RectF,
679 visible_bounds: RectF,
680 layout: &mut LayoutState,
681 cx: &mut PaintContext,
682 ) {
683 let scroll_position = layout.snapshot.scroll_position();
684 let scroll_left = scroll_position.x() * layout.em_width;
685 let scroll_top = scroll_position.y() * layout.line_height;
686
687 for block in &mut layout.blocks {
688 let mut origin =
689 bounds.origin() + vec2f(0., block.row as f32 * layout.line_height - scroll_top);
690 if !matches!(block.style, BlockStyle::Sticky) {
691 origin += vec2f(-scroll_left, 0.);
692 }
693 block.element.paint(origin, visible_bounds, cx);
694 }
695 }
696
697 fn max_line_number_width(&self, snapshot: &EditorSnapshot, cx: &LayoutContext) -> f32 {
698 let digit_count = (snapshot.max_buffer_row() as f32).log10().floor() as usize + 1;
699 let style = &self.style;
700
701 cx.text_layout_cache
702 .layout_str(
703 "1".repeat(digit_count).as_str(),
704 style.text.font_size,
705 &[(
706 digit_count,
707 RunStyle {
708 font_id: style.text.font_id,
709 color: Color::black(),
710 underline: Default::default(),
711 },
712 )],
713 )
714 .width()
715 }
716
717 fn layout_line_numbers(
718 &self,
719 rows: Range<u32>,
720 active_rows: &BTreeMap<u32, bool>,
721 snapshot: &EditorSnapshot,
722 cx: &LayoutContext,
723 ) -> Vec<Option<text_layout::Line>> {
724 let style = &self.style;
725 let include_line_numbers = snapshot.mode == EditorMode::Full;
726 let mut line_number_layouts = Vec::with_capacity(rows.len());
727 let mut line_number = String::new();
728 for (ix, row) in snapshot
729 .buffer_rows(rows.start)
730 .take((rows.end - rows.start) as usize)
731 .enumerate()
732 {
733 let display_row = rows.start + ix as u32;
734 let color = if active_rows.contains_key(&display_row) {
735 style.line_number_active
736 } else {
737 style.line_number
738 };
739 if let Some(buffer_row) = row {
740 if include_line_numbers {
741 line_number.clear();
742 write!(&mut line_number, "{}", buffer_row + 1).unwrap();
743 line_number_layouts.push(Some(cx.text_layout_cache.layout_str(
744 &line_number,
745 style.text.font_size,
746 &[(
747 line_number.len(),
748 RunStyle {
749 font_id: style.text.font_id,
750 color,
751 underline: Default::default(),
752 },
753 )],
754 )));
755 }
756 } else {
757 line_number_layouts.push(None);
758 }
759 }
760
761 line_number_layouts
762 }
763
764 fn layout_lines(
765 &mut self,
766 rows: Range<u32>,
767 snapshot: &EditorSnapshot,
768 cx: &LayoutContext,
769 ) -> Vec<text_layout::Line> {
770 if rows.start >= rows.end {
771 return Vec::new();
772 }
773
774 // When the editor is empty and unfocused, then show the placeholder.
775 if snapshot.is_empty() && !snapshot.is_focused() {
776 let placeholder_style = self
777 .style
778 .placeholder_text
779 .as_ref()
780 .unwrap_or_else(|| &self.style.text);
781 let placeholder_text = snapshot.placeholder_text();
782 let placeholder_lines = placeholder_text
783 .as_ref()
784 .map_or("", AsRef::as_ref)
785 .split('\n')
786 .skip(rows.start as usize)
787 .chain(iter::repeat(""))
788 .take(rows.len());
789 return placeholder_lines
790 .map(|line| {
791 cx.text_layout_cache.layout_str(
792 line,
793 placeholder_style.font_size,
794 &[(
795 line.len(),
796 RunStyle {
797 font_id: placeholder_style.font_id,
798 color: placeholder_style.color,
799 underline: Default::default(),
800 },
801 )],
802 )
803 })
804 .collect();
805 } else {
806 let style = &self.style;
807 let chunks = snapshot.chunks(rows.clone(), true).map(|chunk| {
808 let mut highlight_style = chunk
809 .syntax_highlight_id
810 .and_then(|id| id.style(&style.syntax));
811
812 if let Some(chunk_highlight) = chunk.highlight_style {
813 if let Some(highlight_style) = highlight_style.as_mut() {
814 highlight_style.highlight(chunk_highlight);
815 } else {
816 highlight_style = Some(chunk_highlight);
817 }
818 }
819
820 let mut diagnostic_highlight = HighlightStyle::default();
821
822 if chunk.is_unnecessary {
823 diagnostic_highlight.fade_out = Some(style.unnecessary_code_fade);
824 }
825
826 if let Some(severity) = chunk.diagnostic_severity {
827 // Omit underlines for HINT/INFO diagnostics on 'unnecessary' code.
828 if severity <= DiagnosticSeverity::WARNING || !chunk.is_unnecessary {
829 let diagnostic_style = super::diagnostic_style(severity, true, style);
830 diagnostic_highlight.underline = Some(Underline {
831 color: Some(diagnostic_style.message.text.color),
832 thickness: 1.0.into(),
833 squiggly: true,
834 });
835 }
836 }
837
838 if let Some(highlight_style) = highlight_style.as_mut() {
839 highlight_style.highlight(diagnostic_highlight);
840 } else {
841 highlight_style = Some(diagnostic_highlight);
842 }
843
844 (chunk.text, highlight_style)
845 });
846 layout_highlighted_chunks(
847 chunks,
848 &style.text,
849 &cx.text_layout_cache,
850 &cx.font_cache,
851 MAX_LINE_LEN,
852 rows.len() as usize,
853 )
854 }
855 }
856
857 fn layout_blocks(
858 &mut self,
859 rows: Range<u32>,
860 snapshot: &EditorSnapshot,
861 editor_width: f32,
862 scroll_width: f32,
863 gutter_padding: f32,
864 gutter_width: f32,
865 em_width: f32,
866 text_x: f32,
867 line_height: f32,
868 style: &EditorStyle,
869 line_layouts: &[text_layout::Line],
870 cx: &mut LayoutContext,
871 ) -> (f32, Vec<BlockLayout>) {
872 let editor = if let Some(editor) = self.view.upgrade(cx) {
873 editor
874 } else {
875 return Default::default();
876 };
877
878 let tooltip_style = cx.global::<Settings>().theme.tooltip.clone();
879 let scroll_x = snapshot.scroll_position.x();
880 let (fixed_blocks, non_fixed_blocks) = snapshot
881 .blocks_in_range(rows.clone())
882 .partition::<Vec<_>, _>(|(_, block)| match block {
883 TransformBlock::ExcerptHeader { .. } => false,
884 TransformBlock::Custom(block) => block.style() == BlockStyle::Fixed,
885 });
886 let mut render_block = |block: &TransformBlock, width: f32| {
887 let mut element = match block {
888 TransformBlock::Custom(block) => {
889 let align_to = block
890 .position()
891 .to_point(&snapshot.buffer_snapshot)
892 .to_display_point(snapshot);
893 let anchor_x = text_x
894 + if rows.contains(&align_to.row()) {
895 line_layouts[(align_to.row() - rows.start) as usize]
896 .x_for_index(align_to.column() as usize)
897 } else {
898 layout_line(align_to.row(), snapshot, style, cx.text_layout_cache)
899 .x_for_index(align_to.column() as usize)
900 };
901
902 cx.render(&editor, |_, cx| {
903 block.render(&mut BlockContext {
904 cx,
905 anchor_x,
906 gutter_padding,
907 line_height,
908 scroll_x,
909 gutter_width,
910 em_width,
911 })
912 })
913 }
914 TransformBlock::ExcerptHeader {
915 key,
916 buffer,
917 range,
918 starts_new_buffer,
919 ..
920 } => {
921 let jump_icon = project::File::from_dyn(buffer.file()).map(|file| {
922 let jump_position = range
923 .primary
924 .as_ref()
925 .map_or(range.context.start, |primary| primary.start);
926 let jump_action = crate::Jump {
927 path: ProjectPath {
928 worktree_id: file.worktree_id(cx),
929 path: file.path.clone(),
930 },
931 position: language::ToPoint::to_point(&jump_position, buffer),
932 anchor: jump_position,
933 };
934
935 enum JumpIcon {}
936 cx.render(&editor, |_, cx| {
937 MouseEventHandler::new::<JumpIcon, _, _>(*key, cx, |state, _| {
938 let style = style.jump_icon.style_for(state, false);
939 Svg::new("icons/jump.svg")
940 .with_color(style.color)
941 .constrained()
942 .with_width(style.icon_width)
943 .aligned()
944 .contained()
945 .with_style(style.container)
946 .constrained()
947 .with_width(style.button_width)
948 .with_height(style.button_width)
949 .boxed()
950 })
951 .with_cursor_style(CursorStyle::PointingHand)
952 .on_click(move |_, _, cx| cx.dispatch_action(jump_action.clone()))
953 .with_tooltip::<JumpIcon, _>(
954 *key,
955 "Jump to Buffer".to_string(),
956 Some(Box::new(crate::OpenExcerpts)),
957 tooltip_style.clone(),
958 cx,
959 )
960 .aligned()
961 .flex_float()
962 .boxed()
963 })
964 });
965
966 if *starts_new_buffer {
967 let style = &self.style.diagnostic_path_header;
968 let font_size =
969 (style.text_scale_factor * self.style.text.font_size).round();
970
971 let mut filename = None;
972 let mut parent_path = None;
973 if let Some(file) = buffer.file() {
974 let path = file.path();
975 filename = path.file_name().map(|f| f.to_string_lossy().to_string());
976 parent_path =
977 path.parent().map(|p| p.to_string_lossy().to_string() + "/");
978 }
979
980 Flex::row()
981 .with_child(
982 Label::new(
983 filename.unwrap_or_else(|| "untitled".to_string()),
984 style.filename.text.clone().with_font_size(font_size),
985 )
986 .contained()
987 .with_style(style.filename.container)
988 .aligned()
989 .boxed(),
990 )
991 .with_children(parent_path.map(|path| {
992 Label::new(path, style.path.text.clone().with_font_size(font_size))
993 .contained()
994 .with_style(style.path.container)
995 .aligned()
996 .boxed()
997 }))
998 .with_children(jump_icon)
999 .contained()
1000 .with_style(style.container)
1001 .with_padding_left(gutter_padding)
1002 .with_padding_right(gutter_padding)
1003 .expanded()
1004 .named("path header block")
1005 } else {
1006 let text_style = self.style.text.clone();
1007 Flex::row()
1008 .with_child(Label::new("…".to_string(), text_style).boxed())
1009 .with_children(jump_icon)
1010 .contained()
1011 .with_padding_left(gutter_padding)
1012 .with_padding_right(gutter_padding)
1013 .expanded()
1014 .named("collapsed context")
1015 }
1016 }
1017 };
1018
1019 element.layout(
1020 SizeConstraint {
1021 min: Vector2F::zero(),
1022 max: vec2f(width, block.height() as f32 * line_height),
1023 },
1024 cx,
1025 );
1026 element
1027 };
1028
1029 let mut fixed_block_max_width = 0f32;
1030 let mut blocks = Vec::new();
1031 for (row, block) in fixed_blocks {
1032 let element = render_block(block, f32::INFINITY);
1033 fixed_block_max_width = fixed_block_max_width.max(element.size().x() + em_width);
1034 blocks.push(BlockLayout {
1035 row,
1036 element,
1037 style: BlockStyle::Fixed,
1038 });
1039 }
1040 for (row, block) in non_fixed_blocks {
1041 let style = match block {
1042 TransformBlock::Custom(block) => block.style(),
1043 TransformBlock::ExcerptHeader { .. } => BlockStyle::Sticky,
1044 };
1045 let width = match style {
1046 BlockStyle::Sticky => editor_width,
1047 BlockStyle::Flex => editor_width
1048 .max(fixed_block_max_width)
1049 .max(gutter_width + scroll_width),
1050 BlockStyle::Fixed => unreachable!(),
1051 };
1052 let element = render_block(block, width);
1053 blocks.push(BlockLayout {
1054 row,
1055 element,
1056 style,
1057 });
1058 }
1059 (
1060 scroll_width.max(fixed_block_max_width - gutter_width),
1061 blocks,
1062 )
1063 }
1064}
1065
1066impl Element for EditorElement {
1067 type LayoutState = LayoutState;
1068 type PaintState = PaintState;
1069
1070 fn layout(
1071 &mut self,
1072 constraint: SizeConstraint,
1073 cx: &mut LayoutContext,
1074 ) -> (Vector2F, Self::LayoutState) {
1075 let mut size = constraint.max;
1076 if size.x().is_infinite() {
1077 unimplemented!("we don't yet handle an infinite width constraint on buffer elements");
1078 }
1079
1080 let snapshot = self.snapshot(cx.app);
1081 let style = self.style.clone();
1082 let line_height = style.text.line_height(cx.font_cache);
1083
1084 let gutter_padding;
1085 let gutter_width;
1086 let gutter_margin;
1087 if snapshot.mode == EditorMode::Full {
1088 gutter_padding = style.text.em_width(cx.font_cache) * style.gutter_padding_factor;
1089 gutter_width = self.max_line_number_width(&snapshot, cx) + gutter_padding * 2.0;
1090 gutter_margin = -style.text.descent(cx.font_cache);
1091 } else {
1092 gutter_padding = 0.0;
1093 gutter_width = 0.0;
1094 gutter_margin = 0.0;
1095 };
1096
1097 let text_width = size.x() - gutter_width;
1098 let em_width = style.text.em_width(cx.font_cache);
1099 let em_advance = style.text.em_advance(cx.font_cache);
1100 let overscroll = vec2f(em_width, 0.);
1101 let snapshot = self.update_view(cx.app, |view, cx| {
1102 let wrap_width = match view.soft_wrap_mode(cx) {
1103 SoftWrap::None => Some((MAX_LINE_LEN / 2) as f32 * em_advance),
1104 SoftWrap::EditorWidth => {
1105 Some(text_width - gutter_margin - overscroll.x() - em_width)
1106 }
1107 SoftWrap::Column(column) => Some(column as f32 * em_advance),
1108 };
1109
1110 if view.set_wrap_width(wrap_width, cx) {
1111 view.snapshot(cx)
1112 } else {
1113 snapshot
1114 }
1115 });
1116
1117 let scroll_height = (snapshot.max_point().row() + 1) as f32 * line_height;
1118 if let EditorMode::AutoHeight { max_lines } = snapshot.mode {
1119 size.set_y(
1120 scroll_height
1121 .min(constraint.max_along(Axis::Vertical))
1122 .max(constraint.min_along(Axis::Vertical))
1123 .min(line_height * max_lines as f32),
1124 )
1125 } else if let EditorMode::SingleLine = snapshot.mode {
1126 size.set_y(
1127 line_height
1128 .min(constraint.max_along(Axis::Vertical))
1129 .max(constraint.min_along(Axis::Vertical)),
1130 )
1131 } else if size.y().is_infinite() {
1132 size.set_y(scroll_height);
1133 }
1134 let gutter_size = vec2f(gutter_width, size.y());
1135 let text_size = vec2f(text_width, size.y());
1136
1137 let (autoscroll_horizontally, mut snapshot) = self.update_view(cx.app, |view, cx| {
1138 let autoscroll_horizontally = view.autoscroll_vertically(size.y(), line_height, cx);
1139 let snapshot = view.snapshot(cx);
1140 (autoscroll_horizontally, snapshot)
1141 });
1142
1143 let scroll_position = snapshot.scroll_position();
1144 let start_row = scroll_position.y() as u32;
1145 let scroll_top = scroll_position.y() * line_height;
1146
1147 // Add 1 to ensure selections bleed off screen
1148 let end_row = 1 + cmp::min(
1149 ((scroll_top + size.y()) / line_height).ceil() as u32,
1150 snapshot.max_point().row(),
1151 );
1152
1153 let start_anchor = if start_row == 0 {
1154 Anchor::min()
1155 } else {
1156 snapshot
1157 .buffer_snapshot
1158 .anchor_before(DisplayPoint::new(start_row, 0).to_offset(&snapshot, Bias::Left))
1159 };
1160 let end_anchor = if end_row > snapshot.max_point().row() {
1161 Anchor::max()
1162 } else {
1163 snapshot
1164 .buffer_snapshot
1165 .anchor_before(DisplayPoint::new(end_row, 0).to_offset(&snapshot, Bias::Right))
1166 };
1167
1168 let mut selections: Vec<(ReplicaId, Vec<SelectionLayout>)> = Vec::new();
1169 let mut active_rows = BTreeMap::new();
1170 let mut highlighted_rows = None;
1171 let mut highlighted_ranges = Vec::new();
1172 self.update_view(cx.app, |view, cx| {
1173 let display_map = view.display_map.update(cx, |map, cx| map.snapshot(cx));
1174
1175 highlighted_rows = view.highlighted_rows();
1176 let theme = cx.global::<Settings>().theme.as_ref();
1177 highlighted_ranges = view.background_highlights_in_range(
1178 start_anchor.clone()..end_anchor.clone(),
1179 &display_map,
1180 theme,
1181 );
1182
1183 let mut remote_selections = HashMap::default();
1184 for (replica_id, line_mode, selection) in display_map
1185 .buffer_snapshot
1186 .remote_selections_in_range(&(start_anchor.clone()..end_anchor.clone()))
1187 {
1188 // The local selections match the leader's selections.
1189 if Some(replica_id) == view.leader_replica_id {
1190 continue;
1191 }
1192 remote_selections
1193 .entry(replica_id)
1194 .or_insert(Vec::new())
1195 .push(SelectionLayout::new(selection, line_mode, &display_map));
1196 }
1197 selections.extend(remote_selections);
1198
1199 if view.show_local_selections {
1200 let mut local_selections = view
1201 .selections
1202 .disjoint_in_range(start_anchor..end_anchor, cx);
1203 local_selections.extend(view.selections.pending(cx));
1204 for selection in &local_selections {
1205 let is_empty = selection.start == selection.end;
1206 let selection_start = snapshot.prev_line_boundary(selection.start).1;
1207 let selection_end = snapshot.next_line_boundary(selection.end).1;
1208 for row in cmp::max(selection_start.row(), start_row)
1209 ..=cmp::min(selection_end.row(), end_row)
1210 {
1211 let contains_non_empty_selection =
1212 active_rows.entry(row).or_insert(!is_empty);
1213 *contains_non_empty_selection |= !is_empty;
1214 }
1215 }
1216
1217 // Render the local selections in the leader's color when following.
1218 let local_replica_id = view.leader_replica_id.unwrap_or(view.replica_id(cx));
1219
1220 selections.push((
1221 local_replica_id,
1222 local_selections
1223 .into_iter()
1224 .map(|selection| {
1225 SelectionLayout::new(selection, view.selections.line_mode, &display_map)
1226 })
1227 .collect(),
1228 ));
1229 }
1230 });
1231
1232 let line_number_layouts =
1233 self.layout_line_numbers(start_row..end_row, &active_rows, &snapshot, cx);
1234
1235 let mut max_visible_line_width = 0.0;
1236 let line_layouts = self.layout_lines(start_row..end_row, &snapshot, cx);
1237 for line in &line_layouts {
1238 if line.width() > max_visible_line_width {
1239 max_visible_line_width = line.width();
1240 }
1241 }
1242
1243 let style = self.style.clone();
1244 let longest_line_width = layout_line(
1245 snapshot.longest_row(),
1246 &snapshot,
1247 &style,
1248 cx.text_layout_cache,
1249 )
1250 .width();
1251 let scroll_width = longest_line_width.max(max_visible_line_width) + overscroll.x();
1252 let em_width = style.text.em_width(cx.font_cache);
1253 let (scroll_width, blocks) = self.layout_blocks(
1254 start_row..end_row,
1255 &snapshot,
1256 size.x(),
1257 scroll_width,
1258 gutter_padding,
1259 gutter_width,
1260 em_width,
1261 gutter_width + gutter_margin,
1262 line_height,
1263 &style,
1264 &line_layouts,
1265 cx,
1266 );
1267
1268 let max_row = snapshot.max_point().row();
1269 let scroll_max = vec2f(
1270 ((scroll_width - text_size.x()) / em_width).max(0.0),
1271 max_row.saturating_sub(1) as f32,
1272 );
1273
1274 self.update_view(cx.app, |view, cx| {
1275 let clamped = view.clamp_scroll_left(scroll_max.x());
1276 let autoscrolled;
1277 if autoscroll_horizontally {
1278 autoscrolled = view.autoscroll_horizontally(
1279 start_row,
1280 text_size.x(),
1281 scroll_width,
1282 em_width,
1283 &line_layouts,
1284 cx,
1285 );
1286 } else {
1287 autoscrolled = false;
1288 }
1289
1290 if clamped || autoscrolled {
1291 snapshot = view.snapshot(cx);
1292 }
1293 });
1294
1295 let mut context_menu = None;
1296 let mut code_actions_indicator = None;
1297 let mut hover = None;
1298 cx.render(&self.view.upgrade(cx).unwrap(), |view, cx| {
1299 let newest_selection_head = view
1300 .selections
1301 .newest::<usize>(cx)
1302 .head()
1303 .to_display_point(&snapshot);
1304
1305 let style = view.style(cx);
1306 if (start_row..end_row).contains(&newest_selection_head.row()) {
1307 if view.context_menu_visible() {
1308 context_menu =
1309 view.render_context_menu(newest_selection_head, style.clone(), cx);
1310 }
1311
1312 code_actions_indicator = view
1313 .render_code_actions_indicator(&style, cx)
1314 .map(|indicator| (newest_selection_head.row(), indicator));
1315 }
1316
1317 hover = view.hover_state.popover.clone().and_then(|hover| {
1318 let (point, rendered) = hover.render(&snapshot, style.clone(), cx);
1319 if point.row() >= snapshot.scroll_position().y() as u32 {
1320 if line_layouts.len() > (point.row() - start_row) as usize {
1321 return Some((point, rendered));
1322 }
1323 }
1324
1325 None
1326 });
1327 });
1328
1329 if let Some((_, context_menu)) = context_menu.as_mut() {
1330 context_menu.layout(
1331 SizeConstraint {
1332 min: Vector2F::zero(),
1333 max: vec2f(
1334 cx.window_size.x() * 0.7,
1335 (12. * line_height).min((size.y() - line_height) / 2.),
1336 ),
1337 },
1338 cx,
1339 );
1340 }
1341
1342 if let Some((_, indicator)) = code_actions_indicator.as_mut() {
1343 indicator.layout(
1344 SizeConstraint::strict_along(Axis::Vertical, line_height * 0.618),
1345 cx,
1346 );
1347 }
1348
1349 if let Some((_, hover)) = hover.as_mut() {
1350 hover.layout(
1351 SizeConstraint {
1352 min: Vector2F::zero(),
1353 max: vec2f(
1354 (120. * em_width) // Default size
1355 .min(size.x() / 2.) // Shrink to half of the editor width
1356 .max(20. * em_width), // Apply minimum width of 20 characters
1357 (16. * line_height) // Default size
1358 .min(size.y() / 2.) // Shrink to half of the editor height
1359 .max(4. * line_height), // Apply minimum height of 4 lines
1360 ),
1361 },
1362 cx,
1363 );
1364 }
1365
1366 (
1367 size,
1368 LayoutState {
1369 size,
1370 scroll_max,
1371 gutter_size,
1372 gutter_padding,
1373 text_size,
1374 gutter_margin,
1375 snapshot,
1376 active_rows,
1377 highlighted_rows,
1378 highlighted_ranges,
1379 line_layouts,
1380 line_number_layouts,
1381 blocks,
1382 line_height,
1383 em_width,
1384 em_advance,
1385 selections,
1386 context_menu,
1387 code_actions_indicator,
1388 hover,
1389 },
1390 )
1391 }
1392
1393 fn paint(
1394 &mut self,
1395 bounds: RectF,
1396 visible_bounds: RectF,
1397 layout: &mut Self::LayoutState,
1398 cx: &mut PaintContext,
1399 ) -> Self::PaintState {
1400 cx.scene.push_layer(Some(bounds));
1401
1402 let gutter_bounds = RectF::new(bounds.origin(), layout.gutter_size);
1403 let text_bounds = RectF::new(
1404 bounds.origin() + vec2f(layout.gutter_size.x(), 0.0),
1405 layout.text_size,
1406 );
1407
1408 let mut paint_state = PaintState {
1409 bounds,
1410 gutter_bounds,
1411 text_bounds,
1412 context_menu_bounds: None,
1413 hover_bounds: None,
1414 };
1415
1416 self.paint_background(gutter_bounds, text_bounds, layout, cx);
1417 if layout.gutter_size.x() > 0. {
1418 self.paint_gutter(gutter_bounds, visible_bounds, layout, cx);
1419 }
1420 self.paint_text(text_bounds, visible_bounds, layout, &mut paint_state, cx);
1421
1422 if !layout.blocks.is_empty() {
1423 cx.scene.push_layer(Some(bounds));
1424 self.paint_blocks(bounds, visible_bounds, layout, cx);
1425 cx.scene.pop_layer();
1426 }
1427
1428 cx.scene.pop_layer();
1429
1430 paint_state
1431 }
1432
1433 fn dispatch_event(
1434 &mut self,
1435 event: &Event,
1436 _: RectF,
1437 _: RectF,
1438 layout: &mut LayoutState,
1439 paint: &mut PaintState,
1440 cx: &mut EventContext,
1441 ) -> bool {
1442 if let Some((_, context_menu)) = &mut layout.context_menu {
1443 if context_menu.dispatch_event(event, cx) {
1444 return true;
1445 }
1446 }
1447
1448 if let Some((_, indicator)) = &mut layout.code_actions_indicator {
1449 if indicator.dispatch_event(event, cx) {
1450 return true;
1451 }
1452 }
1453
1454 if let Some((_, hover)) = &mut layout.hover {
1455 if hover.dispatch_event(event, cx) {
1456 return true;
1457 }
1458 }
1459
1460 for block in &mut layout.blocks {
1461 if block.element.dispatch_event(event, cx) {
1462 return true;
1463 }
1464 }
1465
1466 match event {
1467 Event::LeftMouseDown {
1468 position,
1469 cmd,
1470 alt,
1471 shift,
1472 click_count,
1473 ..
1474 } => self.mouse_down(
1475 *position,
1476 *cmd,
1477 *alt,
1478 *shift,
1479 *click_count,
1480 layout,
1481 paint,
1482 cx,
1483 ),
1484 Event::LeftMouseUp { position, .. } => self.mouse_up(*position, cx),
1485 Event::LeftMouseDragged { position, .. } => {
1486 self.mouse_dragged(*position, layout, paint, cx)
1487 }
1488 Event::ScrollWheel {
1489 position,
1490 delta,
1491 precise,
1492 } => self.scroll(*position, *delta, *precise, layout, paint, cx),
1493 Event::KeyDown { input, .. } => self.key_down(input.as_deref(), cx),
1494 Event::ModifiersChanged { cmd, .. } => self.modifiers_changed(*cmd, cx),
1495 Event::MouseMoved { position, cmd, .. } => {
1496 self.mouse_moved(*position, *cmd, layout, paint, cx)
1497 }
1498
1499 _ => false,
1500 }
1501 }
1502
1503 fn debug(
1504 &self,
1505 bounds: RectF,
1506 _: &Self::LayoutState,
1507 _: &Self::PaintState,
1508 _: &gpui::DebugContext,
1509 ) -> json::Value {
1510 json!({
1511 "type": "BufferElement",
1512 "bounds": bounds.to_json()
1513 })
1514 }
1515}
1516
1517pub struct LayoutState {
1518 size: Vector2F,
1519 scroll_max: Vector2F,
1520 gutter_size: Vector2F,
1521 gutter_padding: f32,
1522 gutter_margin: f32,
1523 text_size: Vector2F,
1524 snapshot: EditorSnapshot,
1525 active_rows: BTreeMap<u32, bool>,
1526 highlighted_rows: Option<Range<u32>>,
1527 line_layouts: Vec<text_layout::Line>,
1528 line_number_layouts: Vec<Option<text_layout::Line>>,
1529 blocks: Vec<BlockLayout>,
1530 line_height: f32,
1531 em_width: f32,
1532 em_advance: f32,
1533 highlighted_ranges: Vec<(Range<DisplayPoint>, Color)>,
1534 selections: Vec<(ReplicaId, Vec<SelectionLayout>)>,
1535 context_menu: Option<(DisplayPoint, ElementBox)>,
1536 code_actions_indicator: Option<(u32, ElementBox)>,
1537 hover: Option<(DisplayPoint, ElementBox)>,
1538}
1539
1540struct BlockLayout {
1541 row: u32,
1542 element: ElementBox,
1543 style: BlockStyle,
1544}
1545
1546fn layout_line(
1547 row: u32,
1548 snapshot: &EditorSnapshot,
1549 style: &EditorStyle,
1550 layout_cache: &TextLayoutCache,
1551) -> text_layout::Line {
1552 let mut line = snapshot.line(row);
1553
1554 if line.len() > MAX_LINE_LEN {
1555 let mut len = MAX_LINE_LEN;
1556 while !line.is_char_boundary(len) {
1557 len -= 1;
1558 }
1559
1560 line.truncate(len);
1561 }
1562
1563 layout_cache.layout_str(
1564 &line,
1565 style.text.font_size,
1566 &[(
1567 snapshot.line_len(row) as usize,
1568 RunStyle {
1569 font_id: style.text.font_id,
1570 color: Color::black(),
1571 underline: Default::default(),
1572 },
1573 )],
1574 )
1575}
1576
1577pub struct PaintState {
1578 bounds: RectF,
1579 gutter_bounds: RectF,
1580 text_bounds: RectF,
1581 context_menu_bounds: Option<RectF>,
1582 hover_bounds: Option<RectF>,
1583}
1584
1585impl PaintState {
1586 /// Returns two display points. The first is the nearest valid
1587 /// position in the current buffer and the second is the distance to the
1588 /// nearest valid position if there was overshoot.
1589 fn point_for_position(
1590 &self,
1591 snapshot: &EditorSnapshot,
1592 layout: &LayoutState,
1593 position: Vector2F,
1594 ) -> (DisplayPoint, DisplayPoint) {
1595 let scroll_position = snapshot.scroll_position();
1596 let position = position - self.text_bounds.origin();
1597 let y = position.y().max(0.0).min(layout.size.y());
1598 let row = ((y / layout.line_height) + scroll_position.y()) as u32;
1599 let row_overshoot = row.saturating_sub(snapshot.max_point().row());
1600 let row = cmp::min(row, snapshot.max_point().row());
1601 let line = &layout.line_layouts[(row - scroll_position.y() as u32) as usize];
1602 let x = position.x() + (scroll_position.x() * layout.em_width);
1603
1604 let column = if x >= 0.0 {
1605 line.index_for_x(x)
1606 .map(|ix| ix as u32)
1607 .unwrap_or_else(|| snapshot.line_len(row))
1608 } else {
1609 0
1610 };
1611 let column_overshoot = (0f32.max(x - line.width()) / layout.em_advance) as u32;
1612
1613 (
1614 DisplayPoint::new(row, column),
1615 DisplayPoint::new(row_overshoot, column_overshoot),
1616 )
1617 }
1618}
1619
1620#[derive(Copy, Clone, PartialEq, Eq)]
1621pub enum CursorShape {
1622 Bar,
1623 Block,
1624 Underscore,
1625}
1626
1627impl Default for CursorShape {
1628 fn default() -> Self {
1629 CursorShape::Bar
1630 }
1631}
1632
1633struct Cursor {
1634 origin: Vector2F,
1635 block_width: f32,
1636 line_height: f32,
1637 color: Color,
1638 shape: CursorShape,
1639 block_text: Option<Line>,
1640}
1641
1642impl Cursor {
1643 fn paint(&self, cx: &mut PaintContext) {
1644 let bounds = match self.shape {
1645 CursorShape::Bar => RectF::new(self.origin, vec2f(2.0, self.line_height)),
1646 CursorShape::Block => {
1647 RectF::new(self.origin, vec2f(self.block_width, self.line_height))
1648 }
1649 CursorShape::Underscore => RectF::new(
1650 self.origin + Vector2F::new(0.0, self.line_height - 2.0),
1651 vec2f(self.block_width, 2.0),
1652 ),
1653 };
1654
1655 cx.scene.push_quad(Quad {
1656 bounds,
1657 background: Some(self.color),
1658 border: Border::new(0., Color::black()),
1659 corner_radius: 0.,
1660 });
1661
1662 if let Some(block_text) = &self.block_text {
1663 block_text.paint(self.origin, bounds, self.line_height, cx);
1664 }
1665 }
1666}
1667
1668#[derive(Debug)]
1669struct HighlightedRange {
1670 start_y: f32,
1671 line_height: f32,
1672 lines: Vec<HighlightedRangeLine>,
1673 color: Color,
1674 corner_radius: f32,
1675}
1676
1677#[derive(Debug)]
1678struct HighlightedRangeLine {
1679 start_x: f32,
1680 end_x: f32,
1681}
1682
1683impl HighlightedRange {
1684 fn paint(&self, bounds: RectF, scene: &mut Scene) {
1685 if self.lines.len() >= 2 && self.lines[0].start_x > self.lines[1].end_x {
1686 self.paint_lines(self.start_y, &self.lines[0..1], bounds, scene);
1687 self.paint_lines(
1688 self.start_y + self.line_height,
1689 &self.lines[1..],
1690 bounds,
1691 scene,
1692 );
1693 } else {
1694 self.paint_lines(self.start_y, &self.lines, bounds, scene);
1695 }
1696 }
1697
1698 fn paint_lines(
1699 &self,
1700 start_y: f32,
1701 lines: &[HighlightedRangeLine],
1702 bounds: RectF,
1703 scene: &mut Scene,
1704 ) {
1705 if lines.is_empty() {
1706 return;
1707 }
1708
1709 let mut path = PathBuilder::new();
1710 let first_line = lines.first().unwrap();
1711 let last_line = lines.last().unwrap();
1712
1713 let first_top_left = vec2f(first_line.start_x, start_y);
1714 let first_top_right = vec2f(first_line.end_x, start_y);
1715
1716 let curve_height = vec2f(0., self.corner_radius);
1717 let curve_width = |start_x: f32, end_x: f32| {
1718 let max = (end_x - start_x) / 2.;
1719 let width = if max < self.corner_radius {
1720 max
1721 } else {
1722 self.corner_radius
1723 };
1724
1725 vec2f(width, 0.)
1726 };
1727
1728 let top_curve_width = curve_width(first_line.start_x, first_line.end_x);
1729 path.reset(first_top_right - top_curve_width);
1730 path.curve_to(first_top_right + curve_height, first_top_right);
1731
1732 let mut iter = lines.iter().enumerate().peekable();
1733 while let Some((ix, line)) = iter.next() {
1734 let bottom_right = vec2f(line.end_x, start_y + (ix + 1) as f32 * self.line_height);
1735
1736 if let Some((_, next_line)) = iter.peek() {
1737 let next_top_right = vec2f(next_line.end_x, bottom_right.y());
1738
1739 match next_top_right.x().partial_cmp(&bottom_right.x()).unwrap() {
1740 Ordering::Equal => {
1741 path.line_to(bottom_right);
1742 }
1743 Ordering::Less => {
1744 let curve_width = curve_width(next_top_right.x(), bottom_right.x());
1745 path.line_to(bottom_right - curve_height);
1746 if self.corner_radius > 0. {
1747 path.curve_to(bottom_right - curve_width, bottom_right);
1748 }
1749 path.line_to(next_top_right + curve_width);
1750 if self.corner_radius > 0. {
1751 path.curve_to(next_top_right + curve_height, next_top_right);
1752 }
1753 }
1754 Ordering::Greater => {
1755 let curve_width = curve_width(bottom_right.x(), next_top_right.x());
1756 path.line_to(bottom_right - curve_height);
1757 if self.corner_radius > 0. {
1758 path.curve_to(bottom_right + curve_width, bottom_right);
1759 }
1760 path.line_to(next_top_right - curve_width);
1761 if self.corner_radius > 0. {
1762 path.curve_to(next_top_right + curve_height, next_top_right);
1763 }
1764 }
1765 }
1766 } else {
1767 let curve_width = curve_width(line.start_x, line.end_x);
1768 path.line_to(bottom_right - curve_height);
1769 if self.corner_radius > 0. {
1770 path.curve_to(bottom_right - curve_width, bottom_right);
1771 }
1772
1773 let bottom_left = vec2f(line.start_x, bottom_right.y());
1774 path.line_to(bottom_left + curve_width);
1775 if self.corner_radius > 0. {
1776 path.curve_to(bottom_left - curve_height, bottom_left);
1777 }
1778 }
1779 }
1780
1781 if first_line.start_x > last_line.start_x {
1782 let curve_width = curve_width(last_line.start_x, first_line.start_x);
1783 let second_top_left = vec2f(last_line.start_x, start_y + self.line_height);
1784 path.line_to(second_top_left + curve_height);
1785 if self.corner_radius > 0. {
1786 path.curve_to(second_top_left + curve_width, second_top_left);
1787 }
1788 let first_bottom_left = vec2f(first_line.start_x, second_top_left.y());
1789 path.line_to(first_bottom_left - curve_width);
1790 if self.corner_radius > 0. {
1791 path.curve_to(first_bottom_left - curve_height, first_bottom_left);
1792 }
1793 }
1794
1795 path.line_to(first_top_left + curve_height);
1796 if self.corner_radius > 0. {
1797 path.curve_to(first_top_left + top_curve_width, first_top_left);
1798 }
1799 path.line_to(first_top_right - top_curve_width);
1800
1801 scene.push_path(path.build(self.color, Some(bounds)));
1802 }
1803}
1804
1805fn scale_vertical_mouse_autoscroll_delta(delta: f32) -> f32 {
1806 delta.powf(1.5) / 100.0
1807}
1808
1809fn scale_horizontal_mouse_autoscroll_delta(delta: f32) -> f32 {
1810 delta.powf(1.2) / 300.0
1811}
1812
1813#[cfg(test)]
1814mod tests {
1815 use std::sync::Arc;
1816
1817 use super::*;
1818 use crate::{
1819 display_map::{BlockDisposition, BlockProperties},
1820 Editor, MultiBuffer,
1821 };
1822 use settings::Settings;
1823 use util::test::sample_text;
1824
1825 #[gpui::test]
1826 fn test_layout_line_numbers(cx: &mut gpui::MutableAppContext) {
1827 cx.set_global(Settings::test(cx));
1828 let buffer = MultiBuffer::build_simple(&sample_text(6, 6, 'a'), cx);
1829 let (window_id, editor) = cx.add_window(Default::default(), |cx| {
1830 Editor::new(EditorMode::Full, buffer, None, None, cx)
1831 });
1832 let element = EditorElement::new(
1833 editor.downgrade(),
1834 editor.read(cx).style(cx),
1835 CursorShape::Bar,
1836 );
1837
1838 let layouts = editor.update(cx, |editor, cx| {
1839 let snapshot = editor.snapshot(cx);
1840 let mut presenter = cx.build_presenter(window_id, 30.);
1841 let mut layout_cx = presenter.build_layout_context(Vector2F::zero(), false, cx);
1842 element.layout_line_numbers(0..6, &Default::default(), &snapshot, &mut layout_cx)
1843 });
1844 assert_eq!(layouts.len(), 6);
1845 }
1846
1847 #[gpui::test]
1848 fn test_layout_with_placeholder_text_and_blocks(cx: &mut gpui::MutableAppContext) {
1849 cx.set_global(Settings::test(cx));
1850 let buffer = MultiBuffer::build_simple("", cx);
1851 let (window_id, editor) = cx.add_window(Default::default(), |cx| {
1852 Editor::new(EditorMode::Full, buffer, None, None, cx)
1853 });
1854
1855 editor.update(cx, |editor, cx| {
1856 editor.set_placeholder_text("hello", cx);
1857 editor.insert_blocks(
1858 [BlockProperties {
1859 style: BlockStyle::Fixed,
1860 disposition: BlockDisposition::Above,
1861 height: 3,
1862 position: Anchor::min(),
1863 render: Arc::new(|_| Empty::new().boxed()),
1864 }],
1865 cx,
1866 );
1867
1868 // Blur the editor so that it displays placeholder text.
1869 cx.blur();
1870 });
1871
1872 let mut element = EditorElement::new(
1873 editor.downgrade(),
1874 editor.read(cx).style(cx),
1875 CursorShape::Bar,
1876 );
1877
1878 let mut scene = Scene::new(1.0);
1879 let mut presenter = cx.build_presenter(window_id, 30.);
1880 let mut layout_cx = presenter.build_layout_context(Vector2F::zero(), false, cx);
1881 let (size, mut state) = element.layout(
1882 SizeConstraint::new(vec2f(500., 500.), vec2f(500., 500.)),
1883 &mut layout_cx,
1884 );
1885
1886 assert_eq!(state.line_layouts.len(), 4);
1887 assert_eq!(
1888 state
1889 .line_number_layouts
1890 .iter()
1891 .map(Option::is_some)
1892 .collect::<Vec<_>>(),
1893 &[false, false, false, true]
1894 );
1895
1896 // Don't panic.
1897 let bounds = RectF::new(Default::default(), size);
1898 let mut paint_cx = presenter.build_paint_context(&mut scene, bounds.size(), cx);
1899 element.paint(bounds, bounds, &mut state, &mut paint_cx);
1900 }
1901}