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, TruncateFrom, WhiteSpace, Window, WrappedLine,
6 WrappedLineLayout, register_tooltip_mouse_handlers, set_tooltip_on_window,
7};
8use anyhow::Context as _;
9use gpui_util::ResultExt;
10use itertools::Itertools;
11use smallvec::SmallVec;
12use std::{
13 borrow::Cow,
14 cell::{Cell, RefCell},
15 mem,
16 ops::Range,
17 rc::Rc,
18 sync::Arc,
19};
20
21impl Element for &'static str {
22 type RequestLayoutState = TextLayout;
23 type PrepaintState = ();
24
25 fn id(&self) -> Option<ElementId> {
26 None
27 }
28
29 fn source_location(&self) -> Option<&'static core::panic::Location<'static>> {
30 None
31 }
32
33 fn request_layout(
34 &mut self,
35 _id: Option<&GlobalElementId>,
36 _inspector_id: Option<&InspectorElementId>,
37 window: &mut Window,
38 cx: &mut App,
39 ) -> (LayoutId, Self::RequestLayoutState) {
40 let mut state = TextLayout::default();
41 let layout_id = state.layout(SharedString::from(*self), None, window, cx);
42 (layout_id, state)
43 }
44
45 fn prepaint(
46 &mut self,
47 _id: Option<&GlobalElementId>,
48 _inspector_id: Option<&InspectorElementId>,
49 bounds: Bounds<Pixels>,
50 text_layout: &mut Self::RequestLayoutState,
51 _window: &mut Window,
52 _cx: &mut App,
53 ) {
54 text_layout.prepaint(bounds, self)
55 }
56
57 fn paint(
58 &mut self,
59 _id: Option<&GlobalElementId>,
60 _inspector_id: Option<&InspectorElementId>,
61 _bounds: Bounds<Pixels>,
62 text_layout: &mut TextLayout,
63 _: &mut (),
64 window: &mut Window,
65 cx: &mut App,
66 ) {
67 text_layout.paint(self, window, cx)
68 }
69}
70
71impl IntoElement for &'static str {
72 type Element = Self;
73
74 fn into_element(self) -> Self::Element {
75 self
76 }
77}
78
79impl IntoElement for String {
80 type Element = SharedString;
81
82 fn into_element(self) -> Self::Element {
83 self.into()
84 }
85}
86
87impl IntoElement for Cow<'static, str> {
88 type Element = SharedString;
89
90 fn into_element(self) -> Self::Element {
91 self.into()
92 }
93}
94
95impl Element for SharedString {
96 type RequestLayoutState = TextLayout;
97 type PrepaintState = ();
98
99 fn id(&self) -> Option<ElementId> {
100 None
101 }
102
103 fn source_location(&self) -> Option<&'static core::panic::Location<'static>> {
104 None
105 }
106
107 fn request_layout(
108 &mut self,
109 _id: Option<&GlobalElementId>,
110 _inspector_id: Option<&InspectorElementId>,
111 window: &mut Window,
112 cx: &mut App,
113 ) -> (LayoutId, Self::RequestLayoutState) {
114 let mut state = TextLayout::default();
115 let layout_id = state.layout(self.clone(), None, window, cx);
116 (layout_id, state)
117 }
118
119 fn prepaint(
120 &mut self,
121 _id: Option<&GlobalElementId>,
122 _inspector_id: Option<&InspectorElementId>,
123 bounds: Bounds<Pixels>,
124 text_layout: &mut Self::RequestLayoutState,
125 _window: &mut Window,
126 _cx: &mut App,
127 ) {
128 text_layout.prepaint(bounds, self.as_ref())
129 }
130
131 fn paint(
132 &mut self,
133 _id: Option<&GlobalElementId>,
134 _inspector_id: Option<&InspectorElementId>,
135 _bounds: Bounds<Pixels>,
136 text_layout: &mut Self::RequestLayoutState,
137 _: &mut Self::PrepaintState,
138 window: &mut Window,
139 cx: &mut App,
140 ) {
141 text_layout.paint(self.as_ref(), window, cx)
142 }
143}
144
145impl IntoElement for SharedString {
146 type Element = Self;
147
148 fn into_element(self) -> Self::Element {
149 self
150 }
151}
152
153/// Renders text with runs of different styles.
154///
155/// Callers are responsible for setting the correct style for each run.
156/// For text with a uniform style, you can usually avoid calling this constructor
157/// and just pass text directly.
158pub struct StyledText {
159 text: SharedString,
160 runs: Option<Vec<TextRun>>,
161 delayed_highlights: Option<Vec<(Range<usize>, HighlightStyle)>>,
162 layout: TextLayout,
163}
164
165impl StyledText {
166 /// Construct a new styled text element from the given string.
167 pub fn new(text: impl Into<SharedString>) -> Self {
168 StyledText {
169 text: text.into(),
170 runs: None,
171 delayed_highlights: None,
172 layout: TextLayout::default(),
173 }
174 }
175
176 /// Get the layout for this element. This can be used to map indices to pixels and vice versa.
177 pub fn layout(&self) -> &TextLayout {
178 &self.layout
179 }
180
181 /// Set the styling attributes for the given text, as well as
182 /// as any ranges of text that have had their style customized.
183 pub fn with_default_highlights(
184 mut self,
185 default_style: &TextStyle,
186 highlights: impl IntoIterator<Item = (Range<usize>, HighlightStyle)>,
187 ) -> Self {
188 debug_assert!(
189 self.delayed_highlights.is_none(),
190 "Can't use `with_default_highlights` and `with_highlights`"
191 );
192 let runs = Self::compute_runs(&self.text, default_style, highlights);
193 self.with_runs(runs)
194 }
195
196 /// Set the styling attributes for the given text, as well as
197 /// as any ranges of text that have had their style customized.
198 pub fn with_highlights(
199 mut self,
200 highlights: impl IntoIterator<Item = (Range<usize>, HighlightStyle)>,
201 ) -> Self {
202 debug_assert!(
203 self.runs.is_none(),
204 "Can't use `with_highlights` and `with_default_highlights`"
205 );
206 self.delayed_highlights = Some(
207 highlights
208 .into_iter()
209 .inspect(|(run, _)| {
210 debug_assert!(self.text.is_char_boundary(run.start));
211 debug_assert!(self.text.is_char_boundary(run.end));
212 })
213 .collect::<Vec<_>>(),
214 );
215 self
216 }
217
218 fn compute_runs(
219 text: &str,
220 default_style: &TextStyle,
221 highlights: impl IntoIterator<Item = (Range<usize>, HighlightStyle)>,
222 ) -> Vec<TextRun> {
223 let mut runs = Vec::new();
224 let mut ix = 0;
225 for (range, highlight) in highlights {
226 if ix < range.start {
227 debug_assert!(text.is_char_boundary(range.start));
228 runs.push(default_style.clone().to_run(range.start - ix));
229 }
230 debug_assert!(text.is_char_boundary(range.end));
231 runs.push(
232 default_style
233 .clone()
234 .highlight(highlight)
235 .to_run(range.len()),
236 );
237 ix = range.end;
238 }
239 if ix < text.len() {
240 runs.push(default_style.to_run(text.len() - ix));
241 }
242 runs
243 }
244
245 /// Set the text runs for this piece of text.
246 pub fn with_runs(mut self, runs: Vec<TextRun>) -> Self {
247 let mut text = &**self.text;
248 for run in &runs {
249 text = text.get(run.len..).expect("invalid text run");
250 }
251 assert!(text.is_empty(), "invalid text run");
252 self.runs = Some(runs);
253 self
254 }
255}
256
257impl Element for StyledText {
258 type RequestLayoutState = ();
259 type PrepaintState = ();
260
261 fn id(&self) -> Option<ElementId> {
262 None
263 }
264
265 fn source_location(&self) -> Option<&'static core::panic::Location<'static>> {
266 None
267 }
268
269 fn request_layout(
270 &mut self,
271 _id: Option<&GlobalElementId>,
272 _inspector_id: Option<&InspectorElementId>,
273 window: &mut Window,
274 cx: &mut App,
275 ) -> (LayoutId, Self::RequestLayoutState) {
276 let runs = self.runs.take().or_else(|| {
277 self.delayed_highlights.take().map(|delayed_highlights| {
278 Self::compute_runs(&self.text, &window.text_style(), delayed_highlights)
279 })
280 });
281
282 let layout_id = self.layout.layout(self.text.clone(), runs, window, cx);
283 (layout_id, ())
284 }
285
286 fn prepaint(
287 &mut self,
288 _id: Option<&GlobalElementId>,
289 _inspector_id: Option<&InspectorElementId>,
290 bounds: Bounds<Pixels>,
291 _: &mut Self::RequestLayoutState,
292 _window: &mut Window,
293 _cx: &mut App,
294 ) {
295 self.layout.prepaint(bounds, &self.text)
296 }
297
298 fn paint(
299 &mut self,
300 _id: Option<&GlobalElementId>,
301 _inspector_id: Option<&InspectorElementId>,
302 _bounds: Bounds<Pixels>,
303 _: &mut Self::RequestLayoutState,
304 _: &mut Self::PrepaintState,
305 window: &mut Window,
306 cx: &mut App,
307 ) {
308 self.layout.paint(&self.text, window, cx)
309 }
310}
311
312impl IntoElement for StyledText {
313 type Element = Self;
314
315 fn into_element(self) -> Self::Element {
316 self
317 }
318}
319
320/// The Layout for TextElement. This can be used to map indices to pixels and vice versa.
321#[derive(Default, Clone)]
322pub struct TextLayout(Rc<RefCell<Option<TextLayoutInner>>>);
323
324struct TextLayoutInner {
325 len: usize,
326 lines: SmallVec<[WrappedLine; 1]>,
327 line_height: Pixels,
328 wrap_width: Option<Pixels>,
329 size: Option<Size<Pixels>>,
330 bounds: Option<Bounds<Pixels>>,
331}
332
333impl TextLayout {
334 fn layout(
335 &self,
336 text: SharedString,
337 runs: Option<Vec<TextRun>>,
338 window: &mut Window,
339 _: &mut App,
340 ) -> LayoutId {
341 let text_style = window.text_style();
342 let font_size = text_style.font_size.to_pixels(window.rem_size());
343 let line_height = text_style
344 .line_height
345 .to_pixels(font_size.into(), window.rem_size());
346
347 let runs = if let Some(runs) = runs {
348 runs
349 } else {
350 vec![text_style.to_run(text.len())]
351 };
352 window.request_measured_layout(Default::default(), {
353 let element_state = self.clone();
354
355 move |known_dimensions, available_space, window, cx| {
356 let wrap_width = if text_style.white_space == WhiteSpace::Normal {
357 known_dimensions.width.or(match available_space.width {
358 crate::AvailableSpace::Definite(x) => Some(x),
359 _ => None,
360 })
361 } else {
362 None
363 };
364
365 let (truncate_width, truncation_affix, truncate_from) =
366 if let Some(text_overflow) = text_style.text_overflow.clone() {
367 let width = known_dimensions.width.or(match available_space.width {
368 crate::AvailableSpace::Definite(x) => match text_style.line_clamp {
369 Some(max_lines) => Some(x * max_lines),
370 None => Some(x),
371 },
372 _ => None,
373 });
374
375 match text_overflow {
376 TextOverflow::Truncate(s) => (width, s, TruncateFrom::End),
377 TextOverflow::TruncateStart(s) => (width, s, TruncateFrom::Start),
378 }
379 } else {
380 (None, "".into(), TruncateFrom::End)
381 };
382
383 // Only use cached layout if:
384 // 1. We have a cached size
385 // 2. wrap_width matches (or both are None)
386 // 3. truncate_width is None (if truncate_width is Some, we need to re-layout
387 // because the previous layout may have been computed without truncation)
388 if let Some(text_layout) = element_state.0.borrow().as_ref()
389 && let Some(size) = text_layout.size
390 && (wrap_width.is_none() || wrap_width == text_layout.wrap_width)
391 && truncate_width.is_none()
392 {
393 return size;
394 }
395
396 let mut line_wrapper = cx.text_system().line_wrapper(text_style.font(), font_size);
397 let (text, runs) = if let Some(truncate_width) = truncate_width {
398 line_wrapper.truncate_line(
399 text.clone(),
400 truncate_width,
401 &truncation_affix,
402 &runs,
403 truncate_from,
404 )
405 } else {
406 (text.clone(), Cow::Borrowed(&*runs))
407 };
408 let len = text.len();
409
410 let Some(lines) = window
411 .text_system()
412 .shape_text(
413 text,
414 font_size,
415 &runs,
416 wrap_width, // Wrap if we know the width.
417 text_style.line_clamp, // Limit the number of lines if line_clamp is set.
418 )
419 .log_err()
420 else {
421 element_state.0.borrow_mut().replace(TextLayoutInner {
422 lines: Default::default(),
423 len: 0,
424 line_height,
425 wrap_width,
426 size: Some(Size::default()),
427 bounds: None,
428 });
429 return Size::default();
430 };
431
432 let mut size: Size<Pixels> = Size::default();
433 for line in &lines {
434 let line_size = line.size(line_height);
435 size.height += line_size.height;
436 size.width = size.width.max(line_size.width).ceil();
437 }
438
439 element_state.0.borrow_mut().replace(TextLayoutInner {
440 lines,
441 len,
442 line_height,
443 wrap_width,
444 size: Some(size),
445 bounds: None,
446 });
447
448 size
449 }
450 })
451 }
452
453 fn prepaint(&self, bounds: Bounds<Pixels>, text: &str) {
454 let mut element_state = self.0.borrow_mut();
455 let element_state = element_state
456 .as_mut()
457 .with_context(|| format!("measurement has not been performed on {text}"))
458 .unwrap();
459 element_state.bounds = Some(bounds);
460 }
461
462 fn paint(&self, text: &str, window: &mut Window, cx: &mut App) {
463 let element_state = self.0.borrow();
464 let element_state = element_state
465 .as_ref()
466 .with_context(|| format!("measurement has not been performed on {text}"))
467 .unwrap();
468 let bounds = element_state
469 .bounds
470 .with_context(|| format!("prepaint has not been performed on {text}"))
471 .unwrap();
472
473 let line_height = element_state.line_height;
474 let mut line_origin = bounds.origin;
475 let text_style = window.text_style();
476 for line in &element_state.lines {
477 line.paint_background(
478 line_origin,
479 line_height,
480 text_style.text_align,
481 Some(bounds),
482 window,
483 cx,
484 )
485 .log_err();
486 line.paint(
487 line_origin,
488 line_height,
489 text_style.text_align,
490 Some(bounds),
491 window,
492 cx,
493 )
494 .log_err();
495 line_origin.y += line.size(line_height).height;
496 }
497 }
498
499 /// Get the byte index into the input of the pixel position.
500 pub fn index_for_position(&self, mut position: Point<Pixels>) -> Result<usize, usize> {
501 let element_state = self.0.borrow();
502 let element_state = element_state
503 .as_ref()
504 .expect("measurement has not been performed");
505 let bounds = element_state
506 .bounds
507 .expect("prepaint has not been performed");
508
509 if position.y < bounds.top() {
510 return Err(0);
511 }
512
513 let line_height = element_state.line_height;
514 let mut line_origin = bounds.origin;
515 let mut line_start_ix = 0;
516 for line in &element_state.lines {
517 let line_bottom = line_origin.y + line.size(line_height).height;
518 if position.y > line_bottom {
519 line_origin.y = line_bottom;
520 line_start_ix += line.len() + 1;
521 } else {
522 let position_within_line = position - line_origin;
523 match line.index_for_position(position_within_line, line_height) {
524 Ok(index_within_line) => return Ok(line_start_ix + index_within_line),
525 Err(index_within_line) => return Err(line_start_ix + index_within_line),
526 }
527 }
528 }
529
530 Err(line_start_ix.saturating_sub(1))
531 }
532
533 /// Get the pixel position for the given byte index.
534 pub fn position_for_index(&self, index: usize) -> Option<Point<Pixels>> {
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 let ix_within_line = index - line_start_ix;
557 return Some(line_origin + line.position_for_index(ix_within_line, line_height)?);
558 }
559 }
560
561 None
562 }
563
564 /// Retrieve the layout for the line containing the given byte index.
565 pub fn line_layout_for_index(&self, index: usize) -> Option<Arc<WrappedLineLayout>> {
566 let element_state = self.0.borrow();
567 let element_state = element_state
568 .as_ref()
569 .expect("measurement has not been performed");
570 let bounds = element_state
571 .bounds
572 .expect("prepaint has not been performed");
573 let line_height = element_state.line_height;
574
575 let mut line_origin = bounds.origin;
576 let mut line_start_ix = 0;
577
578 for line in &element_state.lines {
579 let line_end_ix = line_start_ix + line.len();
580 if index < line_start_ix {
581 break;
582 } else if index > line_end_ix {
583 line_origin.y += line.size(line_height).height;
584 line_start_ix = line_end_ix + 1;
585 continue;
586 } else {
587 return Some(line.layout.clone());
588 }
589 }
590
591 None
592 }
593
594 /// The bounds of this layout.
595 pub fn bounds(&self) -> Bounds<Pixels> {
596 self.0.borrow().as_ref().unwrap().bounds.unwrap()
597 }
598
599 /// The line height for this layout.
600 pub fn line_height(&self) -> Pixels {
601 self.0.borrow().as_ref().unwrap().line_height
602 }
603
604 /// The UTF-8 length of the underlying text.
605 pub fn len(&self) -> usize {
606 self.0.borrow().as_ref().unwrap().len
607 }
608
609 /// The text for this layout.
610 pub fn text(&self) -> String {
611 self.0
612 .borrow()
613 .as_ref()
614 .unwrap()
615 .lines
616 .iter()
617 .map(|s| &s.text)
618 .join("\n")
619 }
620
621 /// The text for this layout (with soft-wraps as newlines)
622 pub fn wrapped_text(&self) -> String {
623 let mut accumulator = String::new();
624
625 for wrapped in self.0.borrow().as_ref().unwrap().lines.iter() {
626 let mut seen = 0;
627 for boundary in wrapped.layout.wrap_boundaries.iter() {
628 let index = wrapped.layout.unwrapped_layout.runs[boundary.run_ix].glyphs
629 [boundary.glyph_ix]
630 .index;
631
632 accumulator.push_str(&wrapped.text[seen..index]);
633 accumulator.push('\n');
634 seen = index;
635 }
636 accumulator.push_str(&wrapped.text[seen..]);
637 accumulator.push('\n');
638 }
639 // Remove trailing newline
640 accumulator.pop();
641 accumulator
642 }
643}
644
645/// A text element that can be interacted with.
646pub struct InteractiveText {
647 element_id: ElementId,
648 text: StyledText,
649 click_listener:
650 Option<Box<dyn Fn(&[Range<usize>], InteractiveTextClickEvent, &mut Window, &mut App)>>,
651 hover_listener: Option<Box<dyn Fn(Option<usize>, MouseMoveEvent, &mut Window, &mut App)>>,
652 tooltip_builder: Option<Rc<dyn Fn(usize, &mut Window, &mut App) -> Option<AnyView>>>,
653 tooltip_id: Option<TooltipId>,
654 clickable_ranges: Vec<Range<usize>>,
655}
656
657struct InteractiveTextClickEvent {
658 mouse_down_index: usize,
659 mouse_up_index: usize,
660}
661
662#[doc(hidden)]
663#[derive(Default)]
664pub struct InteractiveTextState {
665 mouse_down_index: Rc<Cell<Option<usize>>>,
666 hovered_index: Rc<Cell<Option<usize>>>,
667 active_tooltip: Rc<RefCell<Option<ActiveTooltip>>>,
668}
669
670/// InteractiveTest is a wrapper around StyledText that adds mouse interactions.
671impl InteractiveText {
672 /// Creates a new InteractiveText from the given text.
673 pub fn new(id: impl Into<ElementId>, text: StyledText) -> Self {
674 Self {
675 element_id: id.into(),
676 text,
677 click_listener: None,
678 hover_listener: None,
679 tooltip_builder: None,
680 tooltip_id: None,
681 clickable_ranges: Vec::new(),
682 }
683 }
684
685 /// on_click is called when the user clicks on one of the given ranges, passing the index of
686 /// the clicked range.
687 pub fn on_click(
688 mut self,
689 ranges: Vec<Range<usize>>,
690 listener: impl Fn(usize, &mut Window, &mut App) + 'static,
691 ) -> Self {
692 self.click_listener = Some(Box::new(move |ranges, event, window, cx| {
693 for (range_ix, range) in ranges.iter().enumerate() {
694 if range.contains(&event.mouse_down_index) && range.contains(&event.mouse_up_index)
695 {
696 listener(range_ix, window, cx);
697 }
698 }
699 }));
700 self.clickable_ranges = ranges;
701 self
702 }
703
704 /// on_hover is called when the mouse moves over a character within the text, passing the
705 /// index of the hovered character, or None if the mouse leaves the text.
706 pub fn on_hover(
707 mut self,
708 listener: impl Fn(Option<usize>, MouseMoveEvent, &mut Window, &mut App) + 'static,
709 ) -> Self {
710 self.hover_listener = Some(Box::new(listener));
711 self
712 }
713
714 /// tooltip lets you specify a tooltip for a given character index in the string.
715 pub fn tooltip(
716 mut self,
717 builder: impl Fn(usize, &mut Window, &mut App) -> Option<AnyView> + 'static,
718 ) -> Self {
719 self.tooltip_builder = Some(Rc::new(builder));
720 self
721 }
722}
723
724impl Element for InteractiveText {
725 type RequestLayoutState = ();
726 type PrepaintState = Hitbox;
727
728 fn id(&self) -> Option<ElementId> {
729 Some(self.element_id.clone())
730 }
731
732 fn source_location(&self) -> Option<&'static core::panic::Location<'static>> {
733 None
734 }
735
736 fn request_layout(
737 &mut self,
738 _id: Option<&GlobalElementId>,
739 inspector_id: Option<&InspectorElementId>,
740 window: &mut Window,
741 cx: &mut App,
742 ) -> (LayoutId, Self::RequestLayoutState) {
743 self.text.request_layout(None, inspector_id, window, cx)
744 }
745
746 fn prepaint(
747 &mut self,
748 global_id: Option<&GlobalElementId>,
749 inspector_id: Option<&InspectorElementId>,
750 bounds: Bounds<Pixels>,
751 state: &mut Self::RequestLayoutState,
752 window: &mut Window,
753 cx: &mut App,
754 ) -> Hitbox {
755 window.with_optional_element_state::<InteractiveTextState, _>(
756 global_id,
757 |interactive_state, window| {
758 let mut interactive_state = interactive_state
759 .map(|interactive_state| interactive_state.unwrap_or_default());
760
761 if let Some(interactive_state) = interactive_state.as_mut() {
762 if self.tooltip_builder.is_some() {
763 self.tooltip_id =
764 set_tooltip_on_window(&interactive_state.active_tooltip, window);
765 } else {
766 // If there is no longer a tooltip builder, remove the active tooltip.
767 interactive_state.active_tooltip.take();
768 }
769 }
770
771 self.text
772 .prepaint(None, inspector_id, bounds, state, window, cx);
773 let hitbox = window.insert_hitbox(bounds, HitboxBehavior::Normal);
774 (hitbox, interactive_state)
775 },
776 )
777 }
778
779 fn paint(
780 &mut self,
781 global_id: Option<&GlobalElementId>,
782 inspector_id: Option<&InspectorElementId>,
783 bounds: Bounds<Pixels>,
784 _: &mut Self::RequestLayoutState,
785 hitbox: &mut Hitbox,
786 window: &mut Window,
787 cx: &mut App,
788 ) {
789 let current_view = window.current_view();
790 let text_layout = self.text.layout().clone();
791 window.with_element_state::<InteractiveTextState, _>(
792 global_id.unwrap(),
793 |interactive_state, window| {
794 let mut interactive_state = interactive_state.unwrap_or_default();
795 if let Some(click_listener) = self.click_listener.take() {
796 let mouse_position = window.mouse_position();
797 if let Ok(ix) = text_layout.index_for_position(mouse_position)
798 && self
799 .clickable_ranges
800 .iter()
801 .any(|range| range.contains(&ix))
802 {
803 window.set_cursor_style(crate::CursorStyle::PointingHand, hitbox)
804 }
805
806 let text_layout = text_layout.clone();
807 let mouse_down = interactive_state.mouse_down_index.clone();
808 if let Some(mouse_down_index) = mouse_down.get() {
809 let hitbox = hitbox.clone();
810 let clickable_ranges = mem::take(&mut self.clickable_ranges);
811 window.on_mouse_event(
812 move |event: &MouseUpEvent, phase, window: &mut Window, cx| {
813 if phase == DispatchPhase::Bubble && hitbox.is_hovered(window) {
814 if let Ok(mouse_up_index) =
815 text_layout.index_for_position(event.position)
816 {
817 click_listener(
818 &clickable_ranges,
819 InteractiveTextClickEvent {
820 mouse_down_index,
821 mouse_up_index,
822 },
823 window,
824 cx,
825 )
826 }
827
828 mouse_down.take();
829 window.refresh();
830 }
831 },
832 );
833 } else {
834 let hitbox = hitbox.clone();
835 window.on_mouse_event(move |event: &MouseDownEvent, phase, window, _| {
836 if phase == DispatchPhase::Bubble
837 && hitbox.is_hovered(window)
838 && let Ok(mouse_down_index) =
839 text_layout.index_for_position(event.position)
840 {
841 mouse_down.set(Some(mouse_down_index));
842 window.refresh();
843 }
844 });
845 }
846 }
847
848 window.on_mouse_event({
849 let mut hover_listener = self.hover_listener.take();
850 let hitbox = hitbox.clone();
851 let text_layout = text_layout.clone();
852 let hovered_index = interactive_state.hovered_index.clone();
853 move |event: &MouseMoveEvent, phase, window, cx| {
854 if phase == DispatchPhase::Bubble && hitbox.is_hovered(window) {
855 let current = hovered_index.get();
856 let updated = text_layout.index_for_position(event.position).ok();
857 if current != updated {
858 hovered_index.set(updated);
859 if let Some(hover_listener) = hover_listener.as_ref() {
860 hover_listener(updated, event.clone(), window, cx);
861 }
862 cx.notify(current_view);
863 }
864 }
865 }
866 });
867
868 if let Some(tooltip_builder) = self.tooltip_builder.clone() {
869 let active_tooltip = interactive_state.active_tooltip.clone();
870 let build_tooltip = Rc::new({
871 let tooltip_is_hoverable = false;
872 let text_layout = text_layout.clone();
873 move |window: &mut Window, cx: &mut App| {
874 text_layout
875 .index_for_position(window.mouse_position())
876 .ok()
877 .and_then(|position| tooltip_builder(position, window, cx))
878 .map(|view| (view, tooltip_is_hoverable))
879 }
880 });
881
882 // Use bounds instead of testing hitbox since this is called during prepaint.
883 let check_is_hovered_during_prepaint = Rc::new({
884 let source_bounds = hitbox.bounds;
885 let text_layout = text_layout.clone();
886 let pending_mouse_down = interactive_state.mouse_down_index.clone();
887 move |window: &Window| {
888 text_layout
889 .index_for_position(window.mouse_position())
890 .is_ok()
891 && source_bounds.contains(&window.mouse_position())
892 && pending_mouse_down.get().is_none()
893 }
894 });
895
896 let check_is_hovered = Rc::new({
897 let hitbox = hitbox.clone();
898 let text_layout = text_layout.clone();
899 let pending_mouse_down = interactive_state.mouse_down_index.clone();
900 move |window: &Window| {
901 text_layout
902 .index_for_position(window.mouse_position())
903 .is_ok()
904 && hitbox.is_hovered(window)
905 && pending_mouse_down.get().is_none()
906 }
907 });
908
909 register_tooltip_mouse_handlers(
910 &active_tooltip,
911 self.tooltip_id,
912 build_tooltip,
913 check_is_hovered,
914 check_is_hovered_during_prepaint,
915 window,
916 );
917 }
918
919 self.text
920 .paint(None, inspector_id, bounds, &mut (), &mut (), window, cx);
921
922 ((), interactive_state)
923 },
924 );
925 }
926}
927
928impl IntoElement for InteractiveText {
929 type Element = Self;
930
931 fn into_element(self) -> Self::Element {
932 self
933 }
934}
935
936#[cfg(test)]
937mod tests {
938 #[test]
939 fn test_into_element_for() {
940 use crate::{ParentElement as _, SharedString, div};
941 use std::borrow::Cow;
942
943 let _ = div().child("static str");
944 let _ = div().child("String".to_string());
945 let _ = div().child(Cow::Borrowed("Cow"));
946 let _ = div().child(SharedString::from("SharedString"));
947 }
948}