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 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
422 fn prepaint(&self, bounds: Bounds<Pixels>, text: &str) {
423 let mut element_state = self.0.borrow_mut();
424 let element_state = element_state
425 .as_mut()
426 .with_context(|| format!("measurement has not been performed on {text}"))
427 .unwrap();
428 element_state.bounds = Some(bounds);
429 }
430
431 fn paint(&self, text: &str, window: &mut Window, cx: &mut App) {
432 let element_state = self.0.borrow();
433 let element_state = element_state
434 .as_ref()
435 .with_context(|| format!("measurement has not been performed on {text}"))
436 .unwrap();
437 let bounds = element_state
438 .bounds
439 .with_context(|| format!("prepaint has not been performed on {text}"))
440 .unwrap();
441
442 let line_height = element_state.line_height;
443 let mut line_origin = bounds.origin;
444 let text_style = window.text_style();
445 for line in &element_state.lines {
446 line.paint_background(
447 line_origin,
448 line_height,
449 text_style.text_align,
450 Some(bounds),
451 window,
452 cx,
453 )
454 .log_err();
455 line.paint(
456 line_origin,
457 line_height,
458 text_style.text_align,
459 Some(bounds),
460 window,
461 cx,
462 )
463 .log_err();
464 line_origin.y += line.size(line_height).height;
465 }
466 }
467
468 /// Get the byte index into the input of the pixel position.
469 pub fn index_for_position(&self, mut position: Point<Pixels>) -> Result<usize, usize> {
470 let element_state = self.0.borrow();
471 let element_state = element_state
472 .as_ref()
473 .expect("measurement has not been performed");
474 let bounds = element_state
475 .bounds
476 .expect("prepaint has not been performed");
477
478 if position.y < bounds.top() {
479 return Err(0);
480 }
481
482 let line_height = element_state.line_height;
483 let mut line_origin = bounds.origin;
484 let mut line_start_ix = 0;
485 for line in &element_state.lines {
486 let line_bottom = line_origin.y + line.size(line_height).height;
487 if position.y > line_bottom {
488 line_origin.y = line_bottom;
489 line_start_ix += line.len() + 1;
490 } else {
491 let position_within_line = position - line_origin;
492 match line.index_for_position(position_within_line, line_height) {
493 Ok(index_within_line) => return Ok(line_start_ix + index_within_line),
494 Err(index_within_line) => return Err(line_start_ix + index_within_line),
495 }
496 }
497 }
498
499 Err(line_start_ix.saturating_sub(1))
500 }
501
502 /// Get the pixel position for the given byte index.
503 pub fn position_for_index(&self, index: usize) -> Option<Point<Pixels>> {
504 let element_state = self.0.borrow();
505 let element_state = element_state
506 .as_ref()
507 .expect("measurement has not been performed");
508 let bounds = element_state
509 .bounds
510 .expect("prepaint has not been performed");
511 let line_height = element_state.line_height;
512
513 let mut line_origin = bounds.origin;
514 let mut line_start_ix = 0;
515
516 for line in &element_state.lines {
517 let line_end_ix = line_start_ix + line.len();
518 if index < line_start_ix {
519 break;
520 } else if index > line_end_ix {
521 line_origin.y += line.size(line_height).height;
522 line_start_ix = line_end_ix + 1;
523 continue;
524 } else {
525 let ix_within_line = index - line_start_ix;
526 return Some(line_origin + line.position_for_index(ix_within_line, line_height)?);
527 }
528 }
529
530 None
531 }
532
533 /// Retrieve the layout for the line containing the given byte index.
534 pub fn line_layout_for_index(&self, index: usize) -> Option<Arc<WrappedLineLayout>> {
535 let element_state = self.0.borrow();
536 let element_state = element_state
537 .as_ref()
538 .expect("measurement has not been performed");
539 let bounds = element_state
540 .bounds
541 .expect("prepaint has not been performed");
542 let line_height = element_state.line_height;
543
544 let mut line_origin = bounds.origin;
545 let mut line_start_ix = 0;
546
547 for line in &element_state.lines {
548 let line_end_ix = line_start_ix + line.len();
549 if index < line_start_ix {
550 break;
551 } else if index > line_end_ix {
552 line_origin.y += line.size(line_height).height;
553 line_start_ix = line_end_ix + 1;
554 continue;
555 } else {
556 return Some(line.layout.clone());
557 }
558 }
559
560 None
561 }
562
563 /// The bounds of this layout.
564 pub fn bounds(&self) -> Bounds<Pixels> {
565 self.0.borrow().as_ref().unwrap().bounds.unwrap()
566 }
567
568 /// The line height for this layout.
569 pub fn line_height(&self) -> Pixels {
570 self.0.borrow().as_ref().unwrap().line_height
571 }
572
573 /// The UTF-8 length of the underlying text.
574 pub fn len(&self) -> usize {
575 self.0.borrow().as_ref().unwrap().len
576 }
577
578 /// The text for this layout.
579 pub fn text(&self) -> String {
580 self.0
581 .borrow()
582 .as_ref()
583 .unwrap()
584 .lines
585 .iter()
586 .map(|s| s.text.to_string())
587 .collect::<Vec<_>>()
588 .join("\n")
589 }
590
591 /// The text for this layout (with soft-wraps as newlines)
592 pub fn wrapped_text(&self) -> String {
593 let mut lines = Vec::new();
594 for wrapped in self.0.borrow().as_ref().unwrap().lines.iter() {
595 let mut seen = 0;
596 for boundary in wrapped.layout.wrap_boundaries.iter() {
597 let index = wrapped.layout.unwrapped_layout.runs[boundary.run_ix].glyphs
598 [boundary.glyph_ix]
599 .index;
600
601 lines.push(wrapped.text[seen..index].to_string());
602 seen = index;
603 }
604 lines.push(wrapped.text[seen..].to_string());
605 }
606
607 lines.join("\n")
608 }
609}
610
611/// A text element that can be interacted with.
612pub struct InteractiveText {
613 element_id: ElementId,
614 text: StyledText,
615 click_listener:
616 Option<Box<dyn Fn(&[Range<usize>], InteractiveTextClickEvent, &mut Window, &mut App)>>,
617 hover_listener: Option<Box<dyn Fn(Option<usize>, MouseMoveEvent, &mut Window, &mut App)>>,
618 tooltip_builder: Option<Rc<dyn Fn(usize, &mut Window, &mut App) -> Option<AnyView>>>,
619 tooltip_id: Option<TooltipId>,
620 clickable_ranges: Vec<Range<usize>>,
621}
622
623struct InteractiveTextClickEvent {
624 mouse_down_index: usize,
625 mouse_up_index: usize,
626}
627
628#[doc(hidden)]
629#[derive(Default)]
630pub struct InteractiveTextState {
631 mouse_down_index: Rc<Cell<Option<usize>>>,
632 hovered_index: Rc<Cell<Option<usize>>>,
633 active_tooltip: Rc<RefCell<Option<ActiveTooltip>>>,
634}
635
636/// InteractiveTest is a wrapper around StyledText that adds mouse interactions.
637impl InteractiveText {
638 /// Creates a new InteractiveText from the given text.
639 pub fn new(id: impl Into<ElementId>, text: StyledText) -> Self {
640 Self {
641 element_id: id.into(),
642 text,
643 click_listener: None,
644 hover_listener: None,
645 tooltip_builder: None,
646 tooltip_id: None,
647 clickable_ranges: Vec::new(),
648 }
649 }
650
651 /// on_click is called when the user clicks on one of the given ranges, passing the index of
652 /// the clicked range.
653 pub fn on_click(
654 mut self,
655 ranges: Vec<Range<usize>>,
656 listener: impl Fn(usize, &mut Window, &mut App) + 'static,
657 ) -> Self {
658 self.click_listener = Some(Box::new(move |ranges, event, window, cx| {
659 for (range_ix, range) in ranges.iter().enumerate() {
660 if range.contains(&event.mouse_down_index) && range.contains(&event.mouse_up_index)
661 {
662 listener(range_ix, window, cx);
663 }
664 }
665 }));
666 self.clickable_ranges = ranges;
667 self
668 }
669
670 /// on_hover is called when the mouse moves over a character within the text, passing the
671 /// index of the hovered character, or None if the mouse leaves the text.
672 pub fn on_hover(
673 mut self,
674 listener: impl Fn(Option<usize>, MouseMoveEvent, &mut Window, &mut App) + 'static,
675 ) -> Self {
676 self.hover_listener = Some(Box::new(listener));
677 self
678 }
679
680 /// tooltip lets you specify a tooltip for a given character index in the string.
681 pub fn tooltip(
682 mut self,
683 builder: impl Fn(usize, &mut Window, &mut App) -> Option<AnyView> + 'static,
684 ) -> Self {
685 self.tooltip_builder = Some(Rc::new(builder));
686 self
687 }
688}
689
690impl Element for InteractiveText {
691 type RequestLayoutState = ();
692 type PrepaintState = Hitbox;
693
694 fn id(&self) -> Option<ElementId> {
695 Some(self.element_id.clone())
696 }
697
698 fn source_location(&self) -> Option<&'static core::panic::Location<'static>> {
699 None
700 }
701
702 fn request_layout(
703 &mut self,
704 _id: Option<&GlobalElementId>,
705 inspector_id: Option<&InspectorElementId>,
706 window: &mut Window,
707 cx: &mut App,
708 ) -> (LayoutId, Self::RequestLayoutState) {
709 self.text.request_layout(None, inspector_id, window, cx)
710 }
711
712 fn prepaint(
713 &mut self,
714 global_id: Option<&GlobalElementId>,
715 inspector_id: Option<&InspectorElementId>,
716 bounds: Bounds<Pixels>,
717 state: &mut Self::RequestLayoutState,
718 window: &mut Window,
719 cx: &mut App,
720 ) -> Hitbox {
721 window.with_optional_element_state::<InteractiveTextState, _>(
722 global_id,
723 |interactive_state, window| {
724 let mut interactive_state = interactive_state
725 .map(|interactive_state| interactive_state.unwrap_or_default());
726
727 if let Some(interactive_state) = interactive_state.as_mut() {
728 if self.tooltip_builder.is_some() {
729 self.tooltip_id =
730 set_tooltip_on_window(&interactive_state.active_tooltip, window);
731 } else {
732 // If there is no longer a tooltip builder, remove the active tooltip.
733 interactive_state.active_tooltip.take();
734 }
735 }
736
737 self.text
738 .prepaint(None, inspector_id, bounds, state, window, cx);
739 let hitbox = window.insert_hitbox(bounds, HitboxBehavior::Normal);
740 (hitbox, interactive_state)
741 },
742 )
743 }
744
745 fn paint(
746 &mut self,
747 global_id: Option<&GlobalElementId>,
748 inspector_id: Option<&InspectorElementId>,
749 bounds: Bounds<Pixels>,
750 _: &mut Self::RequestLayoutState,
751 hitbox: &mut Hitbox,
752 window: &mut Window,
753 cx: &mut App,
754 ) {
755 let current_view = window.current_view();
756 let text_layout = self.text.layout().clone();
757 window.with_element_state::<InteractiveTextState, _>(
758 global_id.unwrap(),
759 |interactive_state, window| {
760 let mut interactive_state = interactive_state.unwrap_or_default();
761 if let Some(click_listener) = self.click_listener.take() {
762 let mouse_position = window.mouse_position();
763 if let Ok(ix) = text_layout.index_for_position(mouse_position)
764 && self
765 .clickable_ranges
766 .iter()
767 .any(|range| range.contains(&ix))
768 {
769 window.set_cursor_style(crate::CursorStyle::PointingHand, hitbox)
770 }
771
772 let text_layout = text_layout.clone();
773 let mouse_down = interactive_state.mouse_down_index.clone();
774 if let Some(mouse_down_index) = mouse_down.get() {
775 let hitbox = hitbox.clone();
776 let clickable_ranges = mem::take(&mut self.clickable_ranges);
777 window.on_mouse_event(
778 move |event: &MouseUpEvent, phase, window: &mut Window, cx| {
779 if phase == DispatchPhase::Bubble && hitbox.is_hovered(window) {
780 if let Ok(mouse_up_index) =
781 text_layout.index_for_position(event.position)
782 {
783 click_listener(
784 &clickable_ranges,
785 InteractiveTextClickEvent {
786 mouse_down_index,
787 mouse_up_index,
788 },
789 window,
790 cx,
791 )
792 }
793
794 mouse_down.take();
795 window.refresh();
796 }
797 },
798 );
799 } else {
800 let hitbox = hitbox.clone();
801 window.on_mouse_event(move |event: &MouseDownEvent, phase, window, _| {
802 if phase == DispatchPhase::Bubble
803 && hitbox.is_hovered(window)
804 && let Ok(mouse_down_index) =
805 text_layout.index_for_position(event.position)
806 {
807 mouse_down.set(Some(mouse_down_index));
808 window.refresh();
809 }
810 });
811 }
812 }
813
814 window.on_mouse_event({
815 let mut hover_listener = self.hover_listener.take();
816 let hitbox = hitbox.clone();
817 let text_layout = text_layout.clone();
818 let hovered_index = interactive_state.hovered_index.clone();
819 move |event: &MouseMoveEvent, phase, window, cx| {
820 if phase == DispatchPhase::Bubble && hitbox.is_hovered(window) {
821 let current = hovered_index.get();
822 let updated = text_layout.index_for_position(event.position).ok();
823 if current != updated {
824 hovered_index.set(updated);
825 if let Some(hover_listener) = hover_listener.as_ref() {
826 hover_listener(updated, event.clone(), window, cx);
827 }
828 cx.notify(current_view);
829 }
830 }
831 }
832 });
833
834 if let Some(tooltip_builder) = self.tooltip_builder.clone() {
835 let active_tooltip = interactive_state.active_tooltip.clone();
836 let build_tooltip = Rc::new({
837 let tooltip_is_hoverable = false;
838 let text_layout = text_layout.clone();
839 move |window: &mut Window, cx: &mut App| {
840 text_layout
841 .index_for_position(window.mouse_position())
842 .ok()
843 .and_then(|position| tooltip_builder(position, window, cx))
844 .map(|view| (view, tooltip_is_hoverable))
845 }
846 });
847
848 // Use bounds instead of testing hitbox since this is called during prepaint.
849 let check_is_hovered_during_prepaint = Rc::new({
850 let source_bounds = hitbox.bounds;
851 let text_layout = text_layout.clone();
852 let pending_mouse_down = interactive_state.mouse_down_index.clone();
853 move |window: &Window| {
854 text_layout
855 .index_for_position(window.mouse_position())
856 .is_ok()
857 && source_bounds.contains(&window.mouse_position())
858 && pending_mouse_down.get().is_none()
859 }
860 });
861
862 let check_is_hovered = Rc::new({
863 let hitbox = hitbox.clone();
864 let text_layout = text_layout.clone();
865 let pending_mouse_down = interactive_state.mouse_down_index.clone();
866 move |window: &Window| {
867 text_layout
868 .index_for_position(window.mouse_position())
869 .is_ok()
870 && hitbox.is_hovered(window)
871 && pending_mouse_down.get().is_none()
872 }
873 });
874
875 register_tooltip_mouse_handlers(
876 &active_tooltip,
877 self.tooltip_id,
878 build_tooltip,
879 check_is_hovered,
880 check_is_hovered_during_prepaint,
881 window,
882 );
883 }
884
885 self.text
886 .paint(None, inspector_id, bounds, &mut (), &mut (), window, cx);
887
888 ((), interactive_state)
889 },
890 );
891 }
892}
893
894impl IntoElement for InteractiveText {
895 type Element = Self;
896
897 fn into_element(self) -> Self::Element {
898 self
899 }
900}