1use crate::{
2 ActiveTooltip, AnyView, App, Bounds, DispatchPhase, Element, ElementId, GlobalElementId,
3 HighlightStyle, Hitbox, HitboxBehavior, InspectorElementId, IntoElement, LayoutId,
4 MouseDownEvent, MouseMoveEvent, MouseUpEvent, Pixels, Point, SharedString, Size, TextOverflow,
5 TextRun, TextStyle, TooltipId, WhiteSpace, Window, WrappedLine, WrappedLineLayout,
6 register_tooltip_mouse_handlers, set_tooltip_on_window,
7};
8use anyhow::Context as _;
9use smallvec::SmallVec;
10use std::{
11 cell::{Cell, RefCell},
12 mem,
13 ops::Range,
14 rc::Rc,
15 sync::Arc,
16};
17use util::ResultExt;
18
19impl Element for &'static str {
20 type RequestLayoutState = TextLayout;
21 type PrepaintState = ();
22
23 fn id(&self) -> Option<ElementId> {
24 None
25 }
26
27 fn source_location(&self) -> Option<&'static core::panic::Location<'static>> {
28 None
29 }
30
31 fn request_layout(
32 &mut self,
33 _id: Option<&GlobalElementId>,
34 _inspector_id: Option<&InspectorElementId>,
35 window: &mut Window,
36 cx: &mut App,
37 ) -> (LayoutId, Self::RequestLayoutState) {
38 let mut state = TextLayout::default();
39 let layout_id = state.layout(SharedString::from(*self), None, window, cx);
40 (layout_id, state)
41 }
42
43 fn prepaint(
44 &mut self,
45 _id: Option<&GlobalElementId>,
46 _inspector_id: Option<&InspectorElementId>,
47 bounds: Bounds<Pixels>,
48 text_layout: &mut Self::RequestLayoutState,
49 _window: &mut Window,
50 _cx: &mut App,
51 ) {
52 text_layout.prepaint(bounds, self)
53 }
54
55 fn paint(
56 &mut self,
57 _id: Option<&GlobalElementId>,
58 _inspector_id: Option<&InspectorElementId>,
59 _bounds: Bounds<Pixels>,
60 text_layout: &mut TextLayout,
61 _: &mut (),
62 window: &mut Window,
63 cx: &mut App,
64 ) {
65 text_layout.paint(self, window, cx)
66 }
67}
68
69impl IntoElement for &'static str {
70 type Element = Self;
71
72 fn into_element(self) -> Self::Element {
73 self
74 }
75}
76
77impl IntoElement for String {
78 type Element = SharedString;
79
80 fn into_element(self) -> Self::Element {
81 self.into()
82 }
83}
84
85impl Element for SharedString {
86 type RequestLayoutState = TextLayout;
87 type PrepaintState = ();
88
89 fn id(&self) -> Option<ElementId> {
90 None
91 }
92
93 fn source_location(&self) -> Option<&'static core::panic::Location<'static>> {
94 None
95 }
96
97 fn request_layout(
98 &mut self,
99 _id: Option<&GlobalElementId>,
100 _inspector_id: Option<&InspectorElementId>,
101 window: &mut Window,
102 cx: &mut App,
103 ) -> (LayoutId, Self::RequestLayoutState) {
104 let mut state = TextLayout::default();
105 let layout_id = state.layout(self.clone(), None, window, cx);
106 (layout_id, state)
107 }
108
109 fn prepaint(
110 &mut self,
111 _id: Option<&GlobalElementId>,
112 _inspector_id: Option<&InspectorElementId>,
113 bounds: Bounds<Pixels>,
114 text_layout: &mut Self::RequestLayoutState,
115 _window: &mut Window,
116 _cx: &mut App,
117 ) {
118 text_layout.prepaint(bounds, self.as_ref())
119 }
120
121 fn paint(
122 &mut self,
123 _id: Option<&GlobalElementId>,
124 _inspector_id: Option<&InspectorElementId>,
125 _bounds: Bounds<Pixels>,
126 text_layout: &mut Self::RequestLayoutState,
127 _: &mut Self::PrepaintState,
128 window: &mut Window,
129 cx: &mut App,
130 ) {
131 text_layout.paint(self.as_ref(), window, cx)
132 }
133}
134
135impl IntoElement for SharedString {
136 type Element = Self;
137
138 fn into_element(self) -> Self::Element {
139 self
140 }
141}
142
143/// Renders text with runs of different styles.
144///
145/// Callers are responsible for setting the correct style for each run.
146/// For text with a uniform style, you can usually avoid calling this constructor
147/// and just pass text directly.
148pub struct StyledText {
149 text: SharedString,
150 runs: Option<Vec<TextRun>>,
151 delayed_highlights: Option<Vec<(Range<usize>, HighlightStyle)>>,
152 layout: TextLayout,
153}
154
155impl StyledText {
156 /// Construct a new styled text element from the given string.
157 pub fn new(text: impl Into<SharedString>) -> Self {
158 StyledText {
159 text: text.into(),
160 runs: None,
161 delayed_highlights: None,
162 layout: TextLayout::default(),
163 }
164 }
165
166 /// Get the layout for this element. This can be used to map indices to pixels and vice versa.
167 pub fn layout(&self) -> &TextLayout {
168 &self.layout
169 }
170
171 /// Set the styling attributes for the given text, as well as
172 /// as any ranges of text that have had their style customized.
173 pub fn with_default_highlights(
174 mut self,
175 default_style: &TextStyle,
176 highlights: impl IntoIterator<Item = (Range<usize>, HighlightStyle)>,
177 ) -> Self {
178 debug_assert!(
179 self.delayed_highlights.is_none(),
180 "Can't use `with_default_highlights` and `with_highlights`"
181 );
182 let runs = Self::compute_runs(&self.text, default_style, highlights);
183 self.runs = Some(runs);
184 self
185 }
186
187 /// Set the styling attributes for the given text, as well as
188 /// as any ranges of text that have had their style customized.
189 pub fn with_highlights(
190 mut self,
191 highlights: impl IntoIterator<Item = (Range<usize>, HighlightStyle)>,
192 ) -> Self {
193 debug_assert!(
194 self.runs.is_none(),
195 "Can't use `with_highlights` and `with_default_highlights`"
196 );
197 self.delayed_highlights = Some(highlights.into_iter().collect::<Vec<_>>());
198 self
199 }
200
201 fn compute_runs(
202 text: &str,
203 default_style: &TextStyle,
204 highlights: impl IntoIterator<Item = (Range<usize>, HighlightStyle)>,
205 ) -> Vec<TextRun> {
206 let mut runs = Vec::new();
207 let mut ix = 0;
208 for (range, highlight) in highlights {
209 if ix < range.start {
210 runs.push(default_style.clone().to_run(range.start - ix));
211 }
212 runs.push(
213 default_style
214 .clone()
215 .highlight(highlight)
216 .to_run(range.len()),
217 );
218 ix = range.end;
219 }
220 if ix < text.len() {
221 runs.push(default_style.to_run(text.len() - ix));
222 }
223 runs
224 }
225
226 /// Set the text runs for this piece of text.
227 pub fn with_runs(mut self, runs: Vec<TextRun>) -> Self {
228 self.runs = Some(runs);
229 self
230 }
231}
232
233impl Element for StyledText {
234 type RequestLayoutState = ();
235 type PrepaintState = ();
236
237 fn id(&self) -> Option<ElementId> {
238 None
239 }
240
241 fn source_location(&self) -> Option<&'static core::panic::Location<'static>> {
242 None
243 }
244
245 fn request_layout(
246 &mut self,
247 _id: Option<&GlobalElementId>,
248 _inspector_id: Option<&InspectorElementId>,
249 window: &mut Window,
250 cx: &mut App,
251 ) -> (LayoutId, Self::RequestLayoutState) {
252 let runs = self.runs.take().or_else(|| {
253 self.delayed_highlights.take().map(|delayed_highlights| {
254 Self::compute_runs(&self.text, &window.text_style(), delayed_highlights)
255 })
256 });
257
258 let layout_id = self.layout.layout(self.text.clone(), runs, window, cx);
259 (layout_id, ())
260 }
261
262 fn prepaint(
263 &mut self,
264 _id: Option<&GlobalElementId>,
265 _inspector_id: Option<&InspectorElementId>,
266 bounds: Bounds<Pixels>,
267 _: &mut Self::RequestLayoutState,
268 _window: &mut Window,
269 _cx: &mut App,
270 ) {
271 self.layout.prepaint(bounds, &self.text)
272 }
273
274 fn paint(
275 &mut self,
276 _id: Option<&GlobalElementId>,
277 _inspector_id: Option<&InspectorElementId>,
278 _bounds: Bounds<Pixels>,
279 _: &mut Self::RequestLayoutState,
280 _: &mut Self::PrepaintState,
281 window: &mut Window,
282 cx: &mut App,
283 ) {
284 self.layout.paint(&self.text, window, cx)
285 }
286}
287
288impl IntoElement for StyledText {
289 type Element = Self;
290
291 fn into_element(self) -> Self::Element {
292 self
293 }
294}
295
296/// The Layout for TextElement. This can be used to map indices to pixels and vice versa.
297#[derive(Default, Clone)]
298pub struct TextLayout(Rc<RefCell<Option<TextLayoutInner>>>);
299
300struct TextLayoutInner {
301 len: usize,
302 lines: SmallVec<[WrappedLine; 1]>,
303 line_height: Pixels,
304 wrap_width: Option<Pixels>,
305 size: Option<Size<Pixels>>,
306 bounds: Option<Bounds<Pixels>>,
307}
308
309impl TextLayout {
310 fn layout(
311 &self,
312 text: SharedString,
313 runs: Option<Vec<TextRun>>,
314 window: &mut Window,
315 _: &mut App,
316 ) -> LayoutId {
317 let text_style = window.text_style();
318 let font_size = text_style.font_size.to_pixels(window.rem_size());
319 let line_height = text_style
320 .line_height
321 .to_pixels(font_size.into(), window.rem_size());
322
323 let mut runs = if let Some(runs) = runs {
324 runs
325 } else {
326 vec![text_style.to_run(text.len())]
327 };
328
329 let layout_id = window.request_measured_layout(Default::default(), {
330 let element_state = self.clone();
331
332 move |known_dimensions, available_space, window, cx| {
333 let wrap_width = if text_style.white_space == WhiteSpace::Normal {
334 known_dimensions.width.or(match available_space.width {
335 crate::AvailableSpace::Definite(x) => Some(x),
336 _ => None,
337 })
338 } else {
339 None
340 };
341
342 let (truncate_width, truncation_suffix) =
343 if let Some(text_overflow) = text_style.text_overflow.clone() {
344 let width = known_dimensions.width.or(match available_space.width {
345 crate::AvailableSpace::Definite(x) => match text_style.line_clamp {
346 Some(max_lines) => Some(x * max_lines),
347 None => Some(x),
348 },
349 _ => None,
350 });
351
352 match text_overflow {
353 TextOverflow::Truncate(s) => (width, s),
354 }
355 } else {
356 (None, "".into())
357 };
358
359 if let Some(text_layout) = element_state.0.borrow().as_ref()
360 && text_layout.size.is_some()
361 && (wrap_width.is_none() || wrap_width == text_layout.wrap_width)
362 {
363 return text_layout.size.unwrap();
364 }
365
366 let mut line_wrapper = cx.text_system().line_wrapper(text_style.font(), font_size);
367 let text = if let Some(truncate_width) = truncate_width {
368 line_wrapper.truncate_line(
369 text.clone(),
370 truncate_width,
371 &truncation_suffix,
372 &mut runs,
373 )
374 } else {
375 text.clone()
376 };
377 let len = text.len();
378
379 let Some(lines) = window
380 .text_system()
381 .shape_text(
382 text,
383 font_size,
384 &runs,
385 wrap_width, // Wrap if we know the width.
386 text_style.line_clamp, // Limit the number of lines if line_clamp is set.
387 )
388 .log_err()
389 else {
390 element_state.0.borrow_mut().replace(TextLayoutInner {
391 lines: Default::default(),
392 len: 0,
393 line_height,
394 wrap_width,
395 size: Some(Size::default()),
396 bounds: None,
397 });
398 return Size::default();
399 };
400
401 let mut size: Size<Pixels> = Size::default();
402 for line in &lines {
403 let line_size = line.size(line_height);
404 size.height += line_size.height;
405 size.width = size.width.max(line_size.width).ceil();
406 }
407
408 element_state.0.borrow_mut().replace(TextLayoutInner {
409 lines,
410 len,
411 line_height,
412 wrap_width,
413 size: Some(size),
414 bounds: None,
415 });
416
417 size
418 }
419 });
420
421 layout_id
422 }
423
424 fn prepaint(&self, bounds: Bounds<Pixels>, text: &str) {
425 let mut element_state = self.0.borrow_mut();
426 let element_state = element_state
427 .as_mut()
428 .with_context(|| format!("measurement has not been performed on {text}"))
429 .unwrap();
430 element_state.bounds = Some(bounds);
431 }
432
433 fn paint(&self, text: &str, window: &mut Window, cx: &mut App) {
434 let element_state = self.0.borrow();
435 let element_state = element_state
436 .as_ref()
437 .with_context(|| format!("measurement has not been performed on {text}"))
438 .unwrap();
439 let bounds = element_state
440 .bounds
441 .with_context(|| format!("prepaint has not been performed on {text}"))
442 .unwrap();
443
444 let line_height = element_state.line_height;
445 let mut line_origin = bounds.origin;
446 let text_style = window.text_style();
447 for line in &element_state.lines {
448 line.paint_background(
449 line_origin,
450 line_height,
451 text_style.text_align,
452 Some(bounds),
453 window,
454 cx,
455 )
456 .log_err();
457 line.paint(
458 line_origin,
459 line_height,
460 text_style.text_align,
461 Some(bounds),
462 window,
463 cx,
464 )
465 .log_err();
466 line_origin.y += line.size(line_height).height;
467 }
468 }
469
470 /// Get the byte index into the input of the pixel position.
471 pub fn index_for_position(&self, mut position: Point<Pixels>) -> Result<usize, usize> {
472 let element_state = self.0.borrow();
473 let element_state = element_state
474 .as_ref()
475 .expect("measurement has not been performed");
476 let bounds = element_state
477 .bounds
478 .expect("prepaint has not been performed");
479
480 if position.y < bounds.top() {
481 return Err(0);
482 }
483
484 let line_height = element_state.line_height;
485 let mut line_origin = bounds.origin;
486 let mut line_start_ix = 0;
487 for line in &element_state.lines {
488 let line_bottom = line_origin.y + line.size(line_height).height;
489 if position.y > line_bottom {
490 line_origin.y = line_bottom;
491 line_start_ix += line.len() + 1;
492 } else {
493 let position_within_line = position - line_origin;
494 match line.index_for_position(position_within_line, line_height) {
495 Ok(index_within_line) => return Ok(line_start_ix + index_within_line),
496 Err(index_within_line) => return Err(line_start_ix + index_within_line),
497 }
498 }
499 }
500
501 Err(line_start_ix.saturating_sub(1))
502 }
503
504 /// Get the pixel position for the given byte index.
505 pub fn position_for_index(&self, index: usize) -> Option<Point<Pixels>> {
506 let element_state = self.0.borrow();
507 let element_state = element_state
508 .as_ref()
509 .expect("measurement has not been performed");
510 let bounds = element_state
511 .bounds
512 .expect("prepaint has not been performed");
513 let line_height = element_state.line_height;
514
515 let mut line_origin = bounds.origin;
516 let mut line_start_ix = 0;
517
518 for line in &element_state.lines {
519 let line_end_ix = line_start_ix + line.len();
520 if index < line_start_ix {
521 break;
522 } else if index > line_end_ix {
523 line_origin.y += line.size(line_height).height;
524 line_start_ix = line_end_ix + 1;
525 continue;
526 } else {
527 let ix_within_line = index - line_start_ix;
528 return Some(line_origin + line.position_for_index(ix_within_line, line_height)?);
529 }
530 }
531
532 None
533 }
534
535 /// Retrieve the layout for the line containing the given byte index.
536 pub fn line_layout_for_index(&self, index: usize) -> Option<Arc<WrappedLineLayout>> {
537 let element_state = self.0.borrow();
538 let element_state = element_state
539 .as_ref()
540 .expect("measurement has not been performed");
541 let bounds = element_state
542 .bounds
543 .expect("prepaint has not been performed");
544 let line_height = element_state.line_height;
545
546 let mut line_origin = bounds.origin;
547 let mut line_start_ix = 0;
548
549 for line in &element_state.lines {
550 let line_end_ix = line_start_ix + line.len();
551 if index < line_start_ix {
552 break;
553 } else if index > line_end_ix {
554 line_origin.y += line.size(line_height).height;
555 line_start_ix = line_end_ix + 1;
556 continue;
557 } else {
558 return Some(line.layout.clone());
559 }
560 }
561
562 None
563 }
564
565 /// The bounds of this layout.
566 pub fn bounds(&self) -> Bounds<Pixels> {
567 self.0.borrow().as_ref().unwrap().bounds.unwrap()
568 }
569
570 /// The line height for this layout.
571 pub fn line_height(&self) -> Pixels {
572 self.0.borrow().as_ref().unwrap().line_height
573 }
574
575 /// The UTF-8 length of the underlying text.
576 pub fn len(&self) -> usize {
577 self.0.borrow().as_ref().unwrap().len
578 }
579
580 /// The text for this layout.
581 pub fn text(&self) -> String {
582 self.0
583 .borrow()
584 .as_ref()
585 .unwrap()
586 .lines
587 .iter()
588 .map(|s| s.text.to_string())
589 .collect::<Vec<_>>()
590 .join("\n")
591 }
592
593 /// The text for this layout (with soft-wraps as newlines)
594 pub fn wrapped_text(&self) -> String {
595 let mut lines = Vec::new();
596 for wrapped in self.0.borrow().as_ref().unwrap().lines.iter() {
597 let mut seen = 0;
598 for boundary in wrapped.layout.wrap_boundaries.iter() {
599 let index = wrapped.layout.unwrapped_layout.runs[boundary.run_ix].glyphs
600 [boundary.glyph_ix]
601 .index;
602
603 lines.push(wrapped.text[seen..index].to_string());
604 seen = index;
605 }
606 lines.push(wrapped.text[seen..].to_string());
607 }
608
609 lines.join("\n")
610 }
611}
612
613/// A text element that can be interacted with.
614pub struct InteractiveText {
615 element_id: ElementId,
616 text: StyledText,
617 click_listener:
618 Option<Box<dyn Fn(&[Range<usize>], InteractiveTextClickEvent, &mut Window, &mut App)>>,
619 hover_listener: Option<Box<dyn Fn(Option<usize>, MouseMoveEvent, &mut Window, &mut App)>>,
620 tooltip_builder: Option<Rc<dyn Fn(usize, &mut Window, &mut App) -> Option<AnyView>>>,
621 tooltip_id: Option<TooltipId>,
622 clickable_ranges: Vec<Range<usize>>,
623}
624
625struct InteractiveTextClickEvent {
626 mouse_down_index: usize,
627 mouse_up_index: usize,
628}
629
630#[doc(hidden)]
631#[derive(Default)]
632pub struct InteractiveTextState {
633 mouse_down_index: Rc<Cell<Option<usize>>>,
634 hovered_index: Rc<Cell<Option<usize>>>,
635 active_tooltip: Rc<RefCell<Option<ActiveTooltip>>>,
636}
637
638/// InteractiveTest is a wrapper around StyledText that adds mouse interactions.
639impl InteractiveText {
640 /// Creates a new InteractiveText from the given text.
641 pub fn new(id: impl Into<ElementId>, text: StyledText) -> Self {
642 Self {
643 element_id: id.into(),
644 text,
645 click_listener: None,
646 hover_listener: None,
647 tooltip_builder: None,
648 tooltip_id: None,
649 clickable_ranges: Vec::new(),
650 }
651 }
652
653 /// on_click is called when the user clicks on one of the given ranges, passing the index of
654 /// the clicked range.
655 pub fn on_click(
656 mut self,
657 ranges: Vec<Range<usize>>,
658 listener: impl Fn(usize, &mut Window, &mut App) + 'static,
659 ) -> Self {
660 self.click_listener = Some(Box::new(move |ranges, event, window, cx| {
661 for (range_ix, range) in ranges.iter().enumerate() {
662 if range.contains(&event.mouse_down_index) && range.contains(&event.mouse_up_index)
663 {
664 listener(range_ix, window, cx);
665 }
666 }
667 }));
668 self.clickable_ranges = ranges;
669 self
670 }
671
672 /// on_hover is called when the mouse moves over a character within the text, passing the
673 /// index of the hovered character, or None if the mouse leaves the text.
674 pub fn on_hover(
675 mut self,
676 listener: impl Fn(Option<usize>, MouseMoveEvent, &mut Window, &mut App) + 'static,
677 ) -> Self {
678 self.hover_listener = Some(Box::new(listener));
679 self
680 }
681
682 /// tooltip lets you specify a tooltip for a given character index in the string.
683 pub fn tooltip(
684 mut self,
685 builder: impl Fn(usize, &mut Window, &mut App) -> Option<AnyView> + 'static,
686 ) -> Self {
687 self.tooltip_builder = Some(Rc::new(builder));
688 self
689 }
690}
691
692impl Element for InteractiveText {
693 type RequestLayoutState = ();
694 type PrepaintState = Hitbox;
695
696 fn id(&self) -> Option<ElementId> {
697 Some(self.element_id.clone())
698 }
699
700 fn source_location(&self) -> Option<&'static core::panic::Location<'static>> {
701 None
702 }
703
704 fn request_layout(
705 &mut self,
706 _id: Option<&GlobalElementId>,
707 inspector_id: Option<&InspectorElementId>,
708 window: &mut Window,
709 cx: &mut App,
710 ) -> (LayoutId, Self::RequestLayoutState) {
711 self.text.request_layout(None, inspector_id, window, cx)
712 }
713
714 fn prepaint(
715 &mut self,
716 global_id: Option<&GlobalElementId>,
717 inspector_id: Option<&InspectorElementId>,
718 bounds: Bounds<Pixels>,
719 state: &mut Self::RequestLayoutState,
720 window: &mut Window,
721 cx: &mut App,
722 ) -> Hitbox {
723 window.with_optional_element_state::<InteractiveTextState, _>(
724 global_id,
725 |interactive_state, window| {
726 let mut interactive_state = interactive_state
727 .map(|interactive_state| interactive_state.unwrap_or_default());
728
729 if let Some(interactive_state) = interactive_state.as_mut() {
730 if self.tooltip_builder.is_some() {
731 self.tooltip_id =
732 set_tooltip_on_window(&interactive_state.active_tooltip, window);
733 } else {
734 // If there is no longer a tooltip builder, remove the active tooltip.
735 interactive_state.active_tooltip.take();
736 }
737 }
738
739 self.text
740 .prepaint(None, inspector_id, bounds, state, window, cx);
741 let hitbox = window.insert_hitbox(bounds, HitboxBehavior::Normal);
742 (hitbox, interactive_state)
743 },
744 )
745 }
746
747 fn paint(
748 &mut self,
749 global_id: Option<&GlobalElementId>,
750 inspector_id: Option<&InspectorElementId>,
751 bounds: Bounds<Pixels>,
752 _: &mut Self::RequestLayoutState,
753 hitbox: &mut Hitbox,
754 window: &mut Window,
755 cx: &mut App,
756 ) {
757 let current_view = window.current_view();
758 let text_layout = self.text.layout().clone();
759 window.with_element_state::<InteractiveTextState, _>(
760 global_id.unwrap(),
761 |interactive_state, window| {
762 let mut interactive_state = interactive_state.unwrap_or_default();
763 if let Some(click_listener) = self.click_listener.take() {
764 let mouse_position = window.mouse_position();
765 if let Ok(ix) = text_layout.index_for_position(mouse_position)
766 && self
767 .clickable_ranges
768 .iter()
769 .any(|range| range.contains(&ix))
770 {
771 window.set_cursor_style(crate::CursorStyle::PointingHand, hitbox)
772 }
773
774 let text_layout = text_layout.clone();
775 let mouse_down = interactive_state.mouse_down_index.clone();
776 if let Some(mouse_down_index) = mouse_down.get() {
777 let hitbox = hitbox.clone();
778 let clickable_ranges = mem::take(&mut self.clickable_ranges);
779 window.on_mouse_event(
780 move |event: &MouseUpEvent, phase, window: &mut Window, cx| {
781 if phase == DispatchPhase::Bubble && hitbox.is_hovered(window) {
782 if let Ok(mouse_up_index) =
783 text_layout.index_for_position(event.position)
784 {
785 click_listener(
786 &clickable_ranges,
787 InteractiveTextClickEvent {
788 mouse_down_index,
789 mouse_up_index,
790 },
791 window,
792 cx,
793 )
794 }
795
796 mouse_down.take();
797 window.refresh();
798 }
799 },
800 );
801 } else {
802 let hitbox = hitbox.clone();
803 window.on_mouse_event(move |event: &MouseDownEvent, phase, window, _| {
804 if phase == DispatchPhase::Bubble
805 && hitbox.is_hovered(window)
806 && let Ok(mouse_down_index) =
807 text_layout.index_for_position(event.position)
808 {
809 mouse_down.set(Some(mouse_down_index));
810 window.refresh();
811 }
812 });
813 }
814 }
815
816 window.on_mouse_event({
817 let mut hover_listener = self.hover_listener.take();
818 let hitbox = hitbox.clone();
819 let text_layout = text_layout.clone();
820 let hovered_index = interactive_state.hovered_index.clone();
821 move |event: &MouseMoveEvent, phase, window, cx| {
822 if phase == DispatchPhase::Bubble && hitbox.is_hovered(window) {
823 let current = hovered_index.get();
824 let updated = text_layout.index_for_position(event.position).ok();
825 if current != updated {
826 hovered_index.set(updated);
827 if let Some(hover_listener) = hover_listener.as_ref() {
828 hover_listener(updated, event.clone(), window, cx);
829 }
830 cx.notify(current_view);
831 }
832 }
833 }
834 });
835
836 if let Some(tooltip_builder) = self.tooltip_builder.clone() {
837 let active_tooltip = interactive_state.active_tooltip.clone();
838 let build_tooltip = Rc::new({
839 let tooltip_is_hoverable = false;
840 let text_layout = text_layout.clone();
841 move |window: &mut Window, cx: &mut App| {
842 text_layout
843 .index_for_position(window.mouse_position())
844 .ok()
845 .and_then(|position| tooltip_builder(position, window, cx))
846 .map(|view| (view, tooltip_is_hoverable))
847 }
848 });
849
850 // Use bounds instead of testing hitbox since this is called during prepaint.
851 let check_is_hovered_during_prepaint = Rc::new({
852 let source_bounds = hitbox.bounds;
853 let text_layout = text_layout.clone();
854 let pending_mouse_down = interactive_state.mouse_down_index.clone();
855 move |window: &Window| {
856 text_layout
857 .index_for_position(window.mouse_position())
858 .is_ok()
859 && source_bounds.contains(&window.mouse_position())
860 && pending_mouse_down.get().is_none()
861 }
862 });
863
864 let check_is_hovered = Rc::new({
865 let hitbox = hitbox.clone();
866 let text_layout = text_layout.clone();
867 let pending_mouse_down = interactive_state.mouse_down_index.clone();
868 move |window: &Window| {
869 text_layout
870 .index_for_position(window.mouse_position())
871 .is_ok()
872 && hitbox.is_hovered(window)
873 && pending_mouse_down.get().is_none()
874 }
875 });
876
877 register_tooltip_mouse_handlers(
878 &active_tooltip,
879 self.tooltip_id,
880 build_tooltip,
881 check_is_hovered,
882 check_is_hovered_during_prepaint,
883 window,
884 );
885 }
886
887 self.text
888 .paint(None, inspector_id, bounds, &mut (), &mut (), window, cx);
889
890 ((), interactive_state)
891 },
892 );
893 }
894}
895
896impl IntoElement for InteractiveText {
897 type Element = Self;
898
899 fn into_element(self) -> Self::Element {
900 self
901 }
902}