1use crate::{
2 point, px, Action, AnyDrag, AnyElement, AnyTooltip, AnyView, AppContext, BorrowAppContext,
3 BorrowWindow, Bounds, ClickEvent, Component, DispatchPhase, Element, ElementId, FocusEvent,
4 FocusHandle, KeyContext, KeyDownEvent, KeyUpEvent, LayoutId, MouseButton, MouseDownEvent,
5 MouseMoveEvent, MouseUpEvent, ParentComponent, Pixels, Point, Render, ScrollWheelEvent,
6 SharedString, Size, Style, StyleRefinement, Styled, Task, View, ViewContext, Visibility,
7};
8use collections::HashMap;
9use parking_lot::Mutex;
10use refineable::Refineable;
11use smallvec::SmallVec;
12use std::{
13 any::{Any, TypeId},
14 fmt::Debug,
15 marker::PhantomData,
16 mem,
17 sync::Arc,
18 time::Duration,
19};
20use taffy::style::Overflow;
21use util::ResultExt;
22
23const DRAG_THRESHOLD: f64 = 2.;
24const TOOLTIP_DELAY: Duration = Duration::from_millis(500);
25const TOOLTIP_OFFSET: Point<Pixels> = Point::new(px(10.0), px(8.0));
26
27pub struct GroupStyle {
28 pub group: SharedString,
29 pub style: StyleRefinement,
30}
31
32pub trait InteractiveComponent<V: 'static>: Sized + Element<V> {
33 fn interactivity(&mut self) -> &mut Interactivity<V>;
34
35 fn group(mut self, group: impl Into<SharedString>) -> Self {
36 self.interactivity().group = Some(group.into());
37 self
38 }
39
40 fn id(mut self, id: impl Into<ElementId>) -> Stateful<V, Self> {
41 self.interactivity().element_id = Some(id.into());
42
43 Stateful {
44 element: self,
45 view_type: PhantomData,
46 }
47 }
48
49 fn track_focus(mut self, focus_handle: &FocusHandle) -> Focusable<V, Self> {
50 self.interactivity().focusable = true;
51 self.interactivity().tracked_focus_handle = Some(focus_handle.clone());
52 Focusable {
53 element: self,
54 view_type: PhantomData,
55 }
56 }
57
58 fn key_context<C, E>(mut self, key_context: C) -> Self
59 where
60 C: TryInto<KeyContext, Error = E>,
61 E: Debug,
62 {
63 if let Some(key_context) = key_context.try_into().log_err() {
64 self.interactivity().key_context = key_context;
65 }
66 self
67 }
68
69 fn hover(mut self, f: impl FnOnce(StyleRefinement) -> StyleRefinement) -> Self {
70 self.interactivity().hover_style = f(StyleRefinement::default());
71 self
72 }
73
74 fn group_hover(
75 mut self,
76 group_name: impl Into<SharedString>,
77 f: impl FnOnce(StyleRefinement) -> StyleRefinement,
78 ) -> Self {
79 self.interactivity().group_hover_style = Some(GroupStyle {
80 group: group_name.into(),
81 style: f(StyleRefinement::default()),
82 });
83 self
84 }
85
86 fn on_mouse_down(
87 mut self,
88 button: MouseButton,
89 handler: impl Fn(&mut V, &MouseDownEvent, &mut ViewContext<V>) + 'static,
90 ) -> Self {
91 self.interactivity().mouse_down_listeners.push(Box::new(
92 move |view, event, bounds, phase, cx| {
93 if phase == DispatchPhase::Bubble
94 && event.button == button
95 && bounds.contains_point(&event.position)
96 {
97 handler(view, event, cx)
98 }
99 },
100 ));
101 self
102 }
103
104 fn on_any_mouse_down(
105 mut self,
106 handler: impl Fn(&mut V, &MouseDownEvent, &mut ViewContext<V>) + 'static,
107 ) -> Self {
108 self.interactivity().mouse_down_listeners.push(Box::new(
109 move |view, event, bounds, phase, cx| {
110 if phase == DispatchPhase::Bubble && bounds.contains_point(&event.position) {
111 handler(view, event, cx)
112 }
113 },
114 ));
115 self
116 }
117
118 fn on_mouse_up(
119 mut self,
120 button: MouseButton,
121 handler: impl Fn(&mut V, &MouseUpEvent, &mut ViewContext<V>) + 'static,
122 ) -> Self {
123 self.interactivity().mouse_up_listeners.push(Box::new(
124 move |view, event, bounds, phase, cx| {
125 if phase == DispatchPhase::Bubble
126 && event.button == button
127 && bounds.contains_point(&event.position)
128 {
129 handler(view, event, cx)
130 }
131 },
132 ));
133 self
134 }
135
136 fn on_any_mouse_up(
137 mut self,
138 handler: impl Fn(&mut V, &MouseUpEvent, &mut ViewContext<V>) + 'static,
139 ) -> Self {
140 self.interactivity().mouse_up_listeners.push(Box::new(
141 move |view, event, bounds, phase, cx| {
142 if phase == DispatchPhase::Bubble && bounds.contains_point(&event.position) {
143 handler(view, event, cx)
144 }
145 },
146 ));
147 self
148 }
149
150 fn on_mouse_down_out(
151 mut self,
152 handler: impl Fn(&mut V, &MouseDownEvent, &mut ViewContext<V>) + 'static,
153 ) -> Self {
154 self.interactivity().mouse_down_listeners.push(Box::new(
155 move |view, event, bounds, phase, cx| {
156 if phase == DispatchPhase::Capture && !bounds.contains_point(&event.position) {
157 handler(view, event, cx)
158 }
159 },
160 ));
161 self
162 }
163
164 fn on_mouse_up_out(
165 mut self,
166 button: MouseButton,
167 handler: impl Fn(&mut V, &MouseUpEvent, &mut ViewContext<V>) + 'static,
168 ) -> Self {
169 self.interactivity().mouse_up_listeners.push(Box::new(
170 move |view, event, bounds, phase, cx| {
171 if phase == DispatchPhase::Capture
172 && event.button == button
173 && !bounds.contains_point(&event.position)
174 {
175 handler(view, event, cx);
176 }
177 },
178 ));
179 self
180 }
181
182 fn on_mouse_move(
183 mut self,
184 handler: impl Fn(&mut V, &MouseMoveEvent, &mut ViewContext<V>) + 'static,
185 ) -> Self {
186 self.interactivity().mouse_move_listeners.push(Box::new(
187 move |view, event, bounds, phase, cx| {
188 if phase == DispatchPhase::Bubble && bounds.contains_point(&event.position) {
189 handler(view, event, cx);
190 }
191 },
192 ));
193 self
194 }
195
196 fn on_scroll_wheel(
197 mut self,
198 handler: impl Fn(&mut V, &ScrollWheelEvent, &mut ViewContext<V>) + 'static,
199 ) -> Self {
200 self.interactivity().scroll_wheel_listeners.push(Box::new(
201 move |view, event, bounds, phase, cx| {
202 if phase == DispatchPhase::Bubble && bounds.contains_point(&event.position) {
203 handler(view, event, cx);
204 }
205 },
206 ));
207 self
208 }
209
210 /// Capture the given action, fires during the capture phase
211 fn capture_action<A: Action>(
212 mut self,
213 listener: impl Fn(&mut V, &A, &mut ViewContext<V>) + 'static,
214 ) -> Self {
215 self.interactivity().action_listeners.push((
216 TypeId::of::<A>(),
217 Box::new(move |view, action, phase, cx| {
218 let action = action.downcast_ref().unwrap();
219 if phase == DispatchPhase::Capture {
220 listener(view, action, cx)
221 }
222 }),
223 ));
224 self
225 }
226
227 /// Add a listener for the given action, fires during the bubble event phase
228 fn on_action<A: Action>(
229 mut self,
230 listener: impl Fn(&mut V, &A, &mut ViewContext<V>) + 'static,
231 ) -> Self {
232 self.interactivity().action_listeners.push((
233 TypeId::of::<A>(),
234 Box::new(move |view, action, phase, cx| {
235 let action = action.downcast_ref().unwrap();
236 if phase == DispatchPhase::Bubble {
237 listener(view, action, cx)
238 }
239 }),
240 ));
241 self
242 }
243
244 fn on_key_down(
245 mut self,
246 listener: impl Fn(&mut V, &KeyDownEvent, DispatchPhase, &mut ViewContext<V>) + 'static,
247 ) -> Self {
248 self.interactivity()
249 .key_down_listeners
250 .push(Box::new(move |view, event, phase, cx| {
251 listener(view, event, phase, cx)
252 }));
253 self
254 }
255
256 fn on_key_up(
257 mut self,
258 listener: impl Fn(&mut V, &KeyUpEvent, DispatchPhase, &mut ViewContext<V>) + 'static,
259 ) -> Self {
260 self.interactivity()
261 .key_up_listeners
262 .push(Box::new(move |view, event, phase, cx| {
263 listener(view, event, phase, cx)
264 }));
265 self
266 }
267
268 fn drag_over<S: 'static>(mut self, f: impl FnOnce(StyleRefinement) -> StyleRefinement) -> Self {
269 self.interactivity()
270 .drag_over_styles
271 .push((TypeId::of::<S>(), f(StyleRefinement::default())));
272 self
273 }
274
275 fn group_drag_over<S: 'static>(
276 mut self,
277 group_name: impl Into<SharedString>,
278 f: impl FnOnce(StyleRefinement) -> StyleRefinement,
279 ) -> Self {
280 self.interactivity().group_drag_over_styles.push((
281 TypeId::of::<S>(),
282 GroupStyle {
283 group: group_name.into(),
284 style: f(StyleRefinement::default()),
285 },
286 ));
287 self
288 }
289
290 fn on_drop<W: 'static>(
291 mut self,
292 listener: impl Fn(&mut V, View<W>, &mut ViewContext<V>) + 'static,
293 ) -> Self {
294 self.interactivity().drop_listeners.push((
295 TypeId::of::<W>(),
296 Box::new(move |view, dragged_view, cx| {
297 listener(view, dragged_view.downcast().unwrap(), cx);
298 }),
299 ));
300 self
301 }
302}
303
304pub trait StatefulInteractiveComponent<V: 'static, E: Element<V>>: InteractiveComponent<V> {
305 fn focusable(mut self) -> Focusable<V, Self> {
306 self.interactivity().focusable = true;
307 Focusable {
308 element: self,
309 view_type: PhantomData,
310 }
311 }
312
313 fn overflow_scroll(mut self) -> Self {
314 self.interactivity().base_style.overflow.x = Some(Overflow::Scroll);
315 self.interactivity().base_style.overflow.y = Some(Overflow::Scroll);
316 self
317 }
318
319 fn overflow_x_scroll(mut self) -> Self {
320 self.interactivity().base_style.overflow.x = Some(Overflow::Scroll);
321 self
322 }
323
324 fn overflow_y_scroll(mut self) -> Self {
325 self.interactivity().base_style.overflow.y = Some(Overflow::Scroll);
326 self
327 }
328
329 fn active(mut self, f: impl FnOnce(StyleRefinement) -> StyleRefinement) -> Self
330 where
331 Self: Sized,
332 {
333 self.interactivity().active_style = f(StyleRefinement::default());
334 self
335 }
336
337 fn group_active(
338 mut self,
339 group_name: impl Into<SharedString>,
340 f: impl FnOnce(StyleRefinement) -> StyleRefinement,
341 ) -> Self
342 where
343 Self: Sized,
344 {
345 self.interactivity().group_active_style = Some(GroupStyle {
346 group: group_name.into(),
347 style: f(StyleRefinement::default()),
348 });
349 self
350 }
351
352 fn on_click(
353 mut self,
354 listener: impl Fn(&mut V, &ClickEvent, &mut ViewContext<V>) + 'static,
355 ) -> Self
356 where
357 Self: Sized,
358 {
359 self.interactivity()
360 .click_listeners
361 .push(Box::new(move |view, event, cx| listener(view, event, cx)));
362 self
363 }
364
365 fn on_drag<W>(
366 mut self,
367 listener: impl Fn(&mut V, &mut ViewContext<V>) -> View<W> + 'static,
368 ) -> Self
369 where
370 Self: Sized,
371 W: 'static + Render,
372 {
373 debug_assert!(
374 self.interactivity().drag_listener.is_none(),
375 "calling on_drag more than once on the same element is not supported"
376 );
377 self.interactivity().drag_listener =
378 Some(Box::new(move |view_state, cursor_offset, cx| AnyDrag {
379 view: listener(view_state, cx).into(),
380 cursor_offset,
381 }));
382 self
383 }
384
385 fn on_hover(mut self, listener: impl 'static + Fn(&mut V, bool, &mut ViewContext<V>)) -> Self
386 where
387 Self: Sized,
388 {
389 debug_assert!(
390 self.interactivity().hover_listener.is_none(),
391 "calling on_hover more than once on the same element is not supported"
392 );
393 self.interactivity().hover_listener = Some(Box::new(listener));
394 self
395 }
396
397 fn tooltip<W>(
398 mut self,
399 build_tooltip: impl Fn(&mut V, &mut ViewContext<V>) -> View<W> + 'static,
400 ) -> Self
401 where
402 Self: Sized,
403 W: 'static + Render,
404 {
405 debug_assert!(
406 self.interactivity().tooltip_builder.is_none(),
407 "calling tooltip more than once on the same element is not supported"
408 );
409 self.interactivity().tooltip_builder = Some(Arc::new(move |view_state, cx| {
410 build_tooltip(view_state, cx).into()
411 }));
412
413 self
414 }
415}
416
417pub trait FocusableComponent<V: 'static>: InteractiveComponent<V> {
418 fn focus(mut self, f: impl FnOnce(StyleRefinement) -> StyleRefinement) -> Self
419 where
420 Self: Sized,
421 {
422 self.interactivity().focus_style = f(StyleRefinement::default());
423 self
424 }
425
426 fn focus_in(mut self, f: impl FnOnce(StyleRefinement) -> StyleRefinement) -> Self
427 where
428 Self: Sized,
429 {
430 self.interactivity().focus_in_style = f(StyleRefinement::default());
431 self
432 }
433
434 fn in_focus(mut self, f: impl FnOnce(StyleRefinement) -> StyleRefinement) -> Self
435 where
436 Self: Sized,
437 {
438 self.interactivity().in_focus_style = f(StyleRefinement::default());
439 self
440 }
441
442 fn on_focus(
443 mut self,
444 listener: impl Fn(&mut V, &FocusEvent, &mut ViewContext<V>) + 'static,
445 ) -> Self
446 where
447 Self: Sized,
448 {
449 self.interactivity().focus_listeners.push(Box::new(
450 move |view, focus_handle, event, cx| {
451 if event.focused.as_ref() == Some(focus_handle) {
452 listener(view, event, cx)
453 }
454 },
455 ));
456 self
457 }
458
459 fn on_blur(
460 mut self,
461 listener: impl Fn(&mut V, &FocusEvent, &mut ViewContext<V>) + 'static,
462 ) -> Self
463 where
464 Self: Sized,
465 {
466 self.interactivity().focus_listeners.push(Box::new(
467 move |view, focus_handle, event, cx| {
468 if event.blurred.as_ref() == Some(focus_handle) {
469 listener(view, event, cx)
470 }
471 },
472 ));
473 self
474 }
475
476 fn on_focus_in(
477 mut self,
478 listener: impl Fn(&mut V, &FocusEvent, &mut ViewContext<V>) + 'static,
479 ) -> Self
480 where
481 Self: Sized,
482 {
483 self.interactivity().focus_listeners.push(Box::new(
484 move |view, focus_handle, event, cx| {
485 let descendant_blurred = event
486 .blurred
487 .as_ref()
488 .map_or(false, |blurred| focus_handle.contains(blurred, cx));
489 let descendant_focused = event
490 .focused
491 .as_ref()
492 .map_or(false, |focused| focus_handle.contains(focused, cx));
493
494 if !descendant_blurred && descendant_focused {
495 listener(view, event, cx)
496 }
497 },
498 ));
499 self
500 }
501
502 fn on_focus_out(
503 mut self,
504 listener: impl Fn(&mut V, &FocusEvent, &mut ViewContext<V>) + 'static,
505 ) -> Self
506 where
507 Self: Sized,
508 {
509 self.interactivity().focus_listeners.push(Box::new(
510 move |view, focus_handle, event, cx| {
511 let descendant_blurred = event
512 .blurred
513 .as_ref()
514 .map_or(false, |blurred| focus_handle.contains(blurred, cx));
515 let descendant_focused = event
516 .focused
517 .as_ref()
518 .map_or(false, |focused| focus_handle.contains(focused, cx));
519 if descendant_blurred && !descendant_focused {
520 listener(view, event, cx)
521 }
522 },
523 ));
524 self
525 }
526}
527
528pub type FocusListeners<V> = SmallVec<[FocusListener<V>; 2]>;
529
530pub type FocusListener<V> =
531 Box<dyn Fn(&mut V, &FocusHandle, &FocusEvent, &mut ViewContext<V>) + 'static>;
532
533pub type MouseDownListener<V> = Box<
534 dyn Fn(&mut V, &MouseDownEvent, &Bounds<Pixels>, DispatchPhase, &mut ViewContext<V>) + 'static,
535>;
536pub type MouseUpListener<V> = Box<
537 dyn Fn(&mut V, &MouseUpEvent, &Bounds<Pixels>, DispatchPhase, &mut ViewContext<V>) + 'static,
538>;
539
540pub type MouseMoveListener<V> = Box<
541 dyn Fn(&mut V, &MouseMoveEvent, &Bounds<Pixels>, DispatchPhase, &mut ViewContext<V>) + 'static,
542>;
543
544pub type ScrollWheelListener<V> = Box<
545 dyn Fn(&mut V, &ScrollWheelEvent, &Bounds<Pixels>, DispatchPhase, &mut ViewContext<V>)
546 + 'static,
547>;
548
549pub type ClickListener<V> = Box<dyn Fn(&mut V, &ClickEvent, &mut ViewContext<V>) + 'static>;
550
551pub type DragListener<V> =
552 Box<dyn Fn(&mut V, Point<Pixels>, &mut ViewContext<V>) -> AnyDrag + 'static>;
553
554type DropListener<V> = dyn Fn(&mut V, AnyView, &mut ViewContext<V>) + 'static;
555
556pub type HoverListener<V> = Box<dyn Fn(&mut V, bool, &mut ViewContext<V>) + 'static>;
557
558pub type TooltipBuilder<V> = Arc<dyn Fn(&mut V, &mut ViewContext<V>) -> AnyView + 'static>;
559
560pub type KeyDownListener<V> =
561 Box<dyn Fn(&mut V, &KeyDownEvent, DispatchPhase, &mut ViewContext<V>) + 'static>;
562
563pub type KeyUpListener<V> =
564 Box<dyn Fn(&mut V, &KeyUpEvent, DispatchPhase, &mut ViewContext<V>) + 'static>;
565
566pub type ActionListener<V> =
567 Box<dyn Fn(&mut V, &dyn Any, DispatchPhase, &mut ViewContext<V>) + 'static>;
568
569pub fn div<V: 'static>() -> Div<V> {
570 Div {
571 interactivity: Interactivity::default(),
572 children: SmallVec::default(),
573 }
574}
575
576pub struct Div<V> {
577 interactivity: Interactivity<V>,
578 children: SmallVec<[AnyElement<V>; 2]>,
579}
580
581impl<V> Styled for Div<V> {
582 fn style(&mut self) -> &mut StyleRefinement {
583 &mut self.interactivity.base_style
584 }
585}
586
587impl<V: 'static> InteractiveComponent<V> for Div<V> {
588 fn interactivity(&mut self) -> &mut Interactivity<V> {
589 &mut self.interactivity
590 }
591}
592
593impl<V: 'static> ParentComponent<V> for Div<V> {
594 fn children_mut(&mut self) -> &mut SmallVec<[AnyElement<V>; 2]> {
595 &mut self.children
596 }
597}
598
599impl<V: 'static> Element<V> for Div<V> {
600 type ElementState = NodeState;
601
602 fn element_id(&self) -> Option<ElementId> {
603 self.interactivity.element_id.clone()
604 }
605
606 fn initialize(
607 &mut self,
608 view_state: &mut V,
609 element_state: Option<Self::ElementState>,
610 cx: &mut ViewContext<V>,
611 ) -> Self::ElementState {
612 let interactive_state = self
613 .interactivity
614 .initialize(element_state.map(|s| s.interactive_state), cx);
615
616 for child in &mut self.children {
617 child.initialize(view_state, cx);
618 }
619
620 NodeState {
621 interactive_state,
622 child_layout_ids: SmallVec::new(),
623 }
624 }
625
626 fn layout(
627 &mut self,
628 view_state: &mut V,
629 element_state: &mut Self::ElementState,
630 cx: &mut ViewContext<V>,
631 ) -> crate::LayoutId {
632 let mut interactivity = mem::take(&mut self.interactivity);
633 let layout_id =
634 interactivity.layout(&mut element_state.interactive_state, cx, |style, cx| {
635 cx.with_text_style(style.text_style().cloned(), |cx| {
636 element_state.child_layout_ids = self
637 .children
638 .iter_mut()
639 .map(|child| child.layout(view_state, cx))
640 .collect::<SmallVec<_>>();
641 cx.request_layout(&style, element_state.child_layout_ids.iter().copied())
642 })
643 });
644 self.interactivity = interactivity;
645 layout_id
646 }
647
648 fn paint(
649 &mut self,
650 bounds: Bounds<Pixels>,
651 view_state: &mut V,
652 element_state: &mut Self::ElementState,
653 cx: &mut ViewContext<V>,
654 ) {
655 let mut child_min = point(Pixels::MAX, Pixels::MAX);
656 let mut child_max = Point::default();
657 let content_size = if element_state.child_layout_ids.is_empty() {
658 bounds.size
659 } else {
660 for child_layout_id in &element_state.child_layout_ids {
661 let child_bounds = cx.layout_bounds(*child_layout_id);
662 child_min = child_min.min(&child_bounds.origin);
663 child_max = child_max.max(&child_bounds.lower_right());
664 }
665 (child_max - child_min).into()
666 };
667
668 let mut interactivity = mem::take(&mut self.interactivity);
669 interactivity.paint(
670 bounds,
671 content_size,
672 &mut element_state.interactive_state,
673 cx,
674 |style, scroll_offset, cx| {
675 if style.visibility == Visibility::Hidden {
676 return;
677 }
678
679 let z_index = style.z_index.unwrap_or(0);
680
681 cx.with_z_index(z_index, |cx| {
682 cx.with_z_index(0, |cx| {
683 style.paint(bounds, cx);
684 });
685 cx.with_z_index(1, |cx| {
686 cx.with_text_style(style.text_style().cloned(), |cx| {
687 cx.with_content_mask(style.overflow_mask(bounds), |cx| {
688 cx.with_element_offset(scroll_offset, |cx| {
689 for child in &mut self.children {
690 child.paint(view_state, cx);
691 }
692 })
693 })
694 })
695 })
696 })
697 },
698 );
699 self.interactivity = interactivity;
700 }
701}
702
703impl<V: 'static> Component<V> for Div<V> {
704 fn render(self) -> AnyElement<V> {
705 AnyElement::new(self)
706 }
707}
708
709pub struct NodeState {
710 child_layout_ids: SmallVec<[LayoutId; 4]>,
711 interactive_state: InteractiveElementState,
712}
713
714pub struct Interactivity<V> {
715 pub element_id: Option<ElementId>,
716 pub key_context: KeyContext,
717 pub focusable: bool,
718 pub tracked_focus_handle: Option<FocusHandle>,
719 pub focus_listeners: FocusListeners<V>,
720 pub group: Option<SharedString>,
721 pub base_style: StyleRefinement,
722 pub focus_style: StyleRefinement,
723 pub focus_in_style: StyleRefinement,
724 pub in_focus_style: StyleRefinement,
725 pub hover_style: StyleRefinement,
726 pub group_hover_style: Option<GroupStyle>,
727 pub active_style: StyleRefinement,
728 pub group_active_style: Option<GroupStyle>,
729 pub drag_over_styles: SmallVec<[(TypeId, StyleRefinement); 2]>,
730 pub group_drag_over_styles: SmallVec<[(TypeId, GroupStyle); 2]>,
731 pub mouse_down_listeners: SmallVec<[MouseDownListener<V>; 2]>,
732 pub mouse_up_listeners: SmallVec<[MouseUpListener<V>; 2]>,
733 pub mouse_move_listeners: SmallVec<[MouseMoveListener<V>; 2]>,
734 pub scroll_wheel_listeners: SmallVec<[ScrollWheelListener<V>; 2]>,
735 pub key_down_listeners: SmallVec<[KeyDownListener<V>; 2]>,
736 pub key_up_listeners: SmallVec<[KeyUpListener<V>; 2]>,
737 pub action_listeners: SmallVec<[(TypeId, ActionListener<V>); 8]>,
738 pub drop_listeners: SmallVec<[(TypeId, Box<DropListener<V>>); 2]>,
739 pub click_listeners: SmallVec<[ClickListener<V>; 2]>,
740 pub drag_listener: Option<DragListener<V>>,
741 pub hover_listener: Option<HoverListener<V>>,
742 pub tooltip_builder: Option<TooltipBuilder<V>>,
743}
744
745impl<V> Interactivity<V>
746where
747 V: 'static,
748{
749 pub fn initialize(
750 &mut self,
751 element_state: Option<InteractiveElementState>,
752 cx: &mut ViewContext<V>,
753 ) -> InteractiveElementState {
754 let mut element_state = element_state.unwrap_or_default();
755
756 // Ensure we store a focus handle in our element state if we're focusable.
757 // If there's an explicit focus handle we're tracking, use that. Otherwise
758 // create a new handle and store it in the element state, which lives for as
759 // as frames contain an element with this id.
760 if self.focusable {
761 element_state.focus_handle.get_or_insert_with(|| {
762 self.tracked_focus_handle
763 .clone()
764 .unwrap_or_else(|| cx.focus_handle())
765 });
766 }
767
768 element_state
769 }
770
771 pub fn layout(
772 &mut self,
773 element_state: &mut InteractiveElementState,
774 cx: &mut ViewContext<V>,
775 f: impl FnOnce(Style, &mut ViewContext<V>) -> LayoutId,
776 ) -> LayoutId {
777 let style = self.compute_style(None, element_state, cx);
778 f(style, cx)
779 }
780
781 pub fn paint(
782 &mut self,
783 bounds: Bounds<Pixels>,
784 content_size: Size<Pixels>,
785 element_state: &mut InteractiveElementState,
786 cx: &mut ViewContext<V>,
787 f: impl FnOnce(Style, Point<Pixels>, &mut ViewContext<V>),
788 ) {
789 let style = self.compute_style(Some(bounds), element_state, cx);
790
791 if let Some(mouse_cursor) = style.mouse_cursor {
792 let hovered = bounds.contains_point(&cx.mouse_position());
793 if hovered {
794 cx.set_cursor_style(mouse_cursor);
795 }
796 }
797
798 for listener in self.mouse_down_listeners.drain(..) {
799 cx.on_mouse_event(move |state, event: &MouseDownEvent, phase, cx| {
800 listener(state, event, &bounds, phase, cx);
801 })
802 }
803
804 for listener in self.mouse_up_listeners.drain(..) {
805 cx.on_mouse_event(move |state, event: &MouseUpEvent, phase, cx| {
806 listener(state, event, &bounds, phase, cx);
807 })
808 }
809
810 for listener in self.mouse_move_listeners.drain(..) {
811 cx.on_mouse_event(move |state, event: &MouseMoveEvent, phase, cx| {
812 listener(state, event, &bounds, phase, cx);
813 })
814 }
815
816 for listener in self.scroll_wheel_listeners.drain(..) {
817 cx.on_mouse_event(move |state, event: &ScrollWheelEvent, phase, cx| {
818 listener(state, event, &bounds, phase, cx);
819 })
820 }
821
822 let hover_group_bounds = self
823 .group_hover_style
824 .as_ref()
825 .and_then(|group_hover| GroupBounds::get(&group_hover.group, cx));
826
827 if let Some(group_bounds) = hover_group_bounds {
828 let hovered = group_bounds.contains_point(&cx.mouse_position());
829 cx.on_mouse_event(move |_, event: &MouseMoveEvent, phase, cx| {
830 if phase == DispatchPhase::Capture {
831 if group_bounds.contains_point(&event.position) != hovered {
832 cx.notify();
833 }
834 }
835 });
836 }
837
838 if self.hover_style.is_some()
839 || (cx.active_drag.is_some() && !self.drag_over_styles.is_empty())
840 {
841 let hovered = bounds.contains_point(&cx.mouse_position());
842 cx.on_mouse_event(move |_, event: &MouseMoveEvent, phase, cx| {
843 if phase == DispatchPhase::Capture {
844 if bounds.contains_point(&event.position) != hovered {
845 cx.notify();
846 }
847 }
848 });
849 }
850
851 if cx.active_drag.is_some() {
852 let drop_listeners = mem::take(&mut self.drop_listeners);
853 cx.on_mouse_event(move |view, event: &MouseUpEvent, phase, cx| {
854 if phase == DispatchPhase::Bubble && bounds.contains_point(&event.position) {
855 if let Some(drag_state_type) =
856 cx.active_drag.as_ref().map(|drag| drag.view.entity_type())
857 {
858 for (drop_state_type, listener) in &drop_listeners {
859 if *drop_state_type == drag_state_type {
860 let drag = cx
861 .active_drag
862 .take()
863 .expect("checked for type drag state type above");
864 listener(view, drag.view.clone(), cx);
865 cx.notify();
866 cx.stop_propagation();
867 }
868 }
869 }
870 }
871 });
872 }
873
874 let click_listeners = mem::take(&mut self.click_listeners);
875 let drag_listener = mem::take(&mut self.drag_listener);
876
877 if !click_listeners.is_empty() || drag_listener.is_some() {
878 let pending_mouse_down = element_state.pending_mouse_down.clone();
879 let mouse_down = pending_mouse_down.lock().clone();
880 if let Some(mouse_down) = mouse_down {
881 if let Some(drag_listener) = drag_listener {
882 let active_state = element_state.clicked_state.clone();
883
884 cx.on_mouse_event(move |view_state, event: &MouseMoveEvent, phase, cx| {
885 if cx.active_drag.is_some() {
886 if phase == DispatchPhase::Capture {
887 cx.notify();
888 }
889 } else if phase == DispatchPhase::Bubble
890 && bounds.contains_point(&event.position)
891 && (event.position - mouse_down.position).magnitude() > DRAG_THRESHOLD
892 {
893 *active_state.lock() = ElementClickedState::default();
894 let cursor_offset = event.position - bounds.origin;
895 let drag = drag_listener(view_state, cursor_offset, cx);
896 cx.active_drag = Some(drag);
897 cx.notify();
898 cx.stop_propagation();
899 }
900 });
901 }
902
903 cx.on_mouse_event(move |view_state, event: &MouseUpEvent, phase, cx| {
904 if phase == DispatchPhase::Bubble && bounds.contains_point(&event.position) {
905 let mouse_click = ClickEvent {
906 down: mouse_down.clone(),
907 up: event.clone(),
908 };
909 for listener in &click_listeners {
910 listener(view_state, &mouse_click, cx);
911 }
912 }
913 *pending_mouse_down.lock() = None;
914 });
915 } else {
916 cx.on_mouse_event(move |_state, event: &MouseDownEvent, phase, _cx| {
917 if phase == DispatchPhase::Bubble && bounds.contains_point(&event.position) {
918 *pending_mouse_down.lock() = Some(event.clone());
919 }
920 });
921 }
922 }
923
924 if let Some(hover_listener) = self.hover_listener.take() {
925 let was_hovered = element_state.hover_state.clone();
926 let has_mouse_down = element_state.pending_mouse_down.clone();
927
928 cx.on_mouse_event(move |view_state, event: &MouseMoveEvent, phase, cx| {
929 if phase != DispatchPhase::Bubble {
930 return;
931 }
932 let is_hovered =
933 bounds.contains_point(&event.position) && has_mouse_down.lock().is_none();
934 let mut was_hovered = was_hovered.lock();
935
936 if is_hovered != was_hovered.clone() {
937 *was_hovered = is_hovered;
938 drop(was_hovered);
939
940 hover_listener(view_state, is_hovered, cx);
941 }
942 });
943 }
944
945 if let Some(tooltip_builder) = self.tooltip_builder.take() {
946 let active_tooltip = element_state.active_tooltip.clone();
947 let pending_mouse_down = element_state.pending_mouse_down.clone();
948
949 cx.on_mouse_event(move |_, event: &MouseMoveEvent, phase, cx| {
950 if phase != DispatchPhase::Bubble {
951 return;
952 }
953
954 let is_hovered =
955 bounds.contains_point(&event.position) && pending_mouse_down.lock().is_none();
956 if !is_hovered {
957 active_tooltip.lock().take();
958 return;
959 }
960
961 if active_tooltip.lock().is_none() {
962 let task = cx.spawn({
963 let active_tooltip = active_tooltip.clone();
964 let tooltip_builder = tooltip_builder.clone();
965
966 move |view, mut cx| async move {
967 cx.background_executor().timer(TOOLTIP_DELAY).await;
968 view.update(&mut cx, move |view_state, cx| {
969 active_tooltip.lock().replace(ActiveTooltip {
970 waiting: None,
971 tooltip: Some(AnyTooltip {
972 view: tooltip_builder(view_state, cx),
973 cursor_offset: cx.mouse_position() + TOOLTIP_OFFSET,
974 }),
975 });
976 cx.notify();
977 })
978 .ok();
979 }
980 });
981 active_tooltip.lock().replace(ActiveTooltip {
982 waiting: Some(task),
983 tooltip: None,
984 });
985 }
986 });
987
988 if let Some(active_tooltip) = element_state.active_tooltip.lock().as_ref() {
989 if active_tooltip.tooltip.is_some() {
990 cx.active_tooltip = active_tooltip.tooltip.clone()
991 }
992 }
993 }
994
995 let active_state = element_state.clicked_state.clone();
996 if !active_state.lock().is_clicked() {
997 cx.on_mouse_event(move |_, _: &MouseUpEvent, phase, cx| {
998 if phase == DispatchPhase::Capture {
999 *active_state.lock() = ElementClickedState::default();
1000 cx.notify();
1001 }
1002 });
1003 } else {
1004 let active_group_bounds = self
1005 .group_active_style
1006 .as_ref()
1007 .and_then(|group_active| GroupBounds::get(&group_active.group, cx));
1008 cx.on_mouse_event(move |_view, down: &MouseDownEvent, phase, cx| {
1009 if phase == DispatchPhase::Bubble {
1010 let group = active_group_bounds
1011 .map_or(false, |bounds| bounds.contains_point(&down.position));
1012 let element = bounds.contains_point(&down.position);
1013 if group || element {
1014 *active_state.lock() = ElementClickedState { group, element };
1015 cx.notify();
1016 }
1017 }
1018 });
1019 }
1020
1021 let overflow = style.overflow;
1022 if overflow.x == Overflow::Scroll || overflow.y == Overflow::Scroll {
1023 let scroll_offset = element_state
1024 .scroll_offset
1025 .get_or_insert_with(Arc::default)
1026 .clone();
1027 let line_height = cx.line_height();
1028 let scroll_max = (content_size - bounds.size).max(&Size::default());
1029
1030 cx.on_mouse_event(move |_, event: &ScrollWheelEvent, phase, cx| {
1031 if phase == DispatchPhase::Bubble && bounds.contains_point(&event.position) {
1032 let mut scroll_offset = scroll_offset.lock();
1033 let old_scroll_offset = *scroll_offset;
1034 let delta = event.delta.pixel_delta(line_height);
1035
1036 if overflow.x == Overflow::Scroll {
1037 scroll_offset.x =
1038 (scroll_offset.x + delta.x).clamp(-scroll_max.width, px(0.));
1039 }
1040
1041 if overflow.y == Overflow::Scroll {
1042 scroll_offset.y =
1043 (scroll_offset.y + delta.y).clamp(-scroll_max.height, px(0.));
1044 }
1045
1046 if *scroll_offset != old_scroll_offset {
1047 cx.notify();
1048 cx.stop_propagation();
1049 }
1050 }
1051 });
1052 }
1053
1054 if let Some(group) = self.group.clone() {
1055 GroupBounds::push(group, bounds, cx);
1056 }
1057
1058 let scroll_offset = element_state
1059 .scroll_offset
1060 .as_ref()
1061 .map(|scroll_offset| *scroll_offset.lock());
1062
1063 cx.with_key_dispatch(
1064 self.key_context.clone(),
1065 element_state.focus_handle.clone(),
1066 |_, cx| {
1067 for listener in self.key_down_listeners.drain(..) {
1068 cx.on_key_event(move |state, event: &KeyDownEvent, phase, cx| {
1069 listener(state, event, phase, cx);
1070 })
1071 }
1072
1073 for listener in self.key_up_listeners.drain(..) {
1074 cx.on_key_event(move |state, event: &KeyUpEvent, phase, cx| {
1075 listener(state, event, phase, cx);
1076 })
1077 }
1078
1079 for (action_type, listener) in self.action_listeners.drain(..) {
1080 cx.on_action(action_type, listener)
1081 }
1082
1083 if let Some(focus_handle) = element_state.focus_handle.as_ref() {
1084 for listener in self.focus_listeners.drain(..) {
1085 let focus_handle = focus_handle.clone();
1086 cx.on_focus_changed(move |view, event, cx| {
1087 listener(view, &focus_handle, event, cx)
1088 });
1089 }
1090 }
1091
1092 f(style, scroll_offset.unwrap_or_default(), cx)
1093 },
1094 );
1095
1096 if let Some(group) = self.group.as_ref() {
1097 GroupBounds::pop(group, cx);
1098 }
1099 }
1100
1101 pub fn compute_style(
1102 &self,
1103 bounds: Option<Bounds<Pixels>>,
1104 element_state: &mut InteractiveElementState,
1105 cx: &mut ViewContext<V>,
1106 ) -> Style {
1107 let mut style = Style::default();
1108 style.refine(&self.base_style);
1109
1110 if let Some(focus_handle) = self.tracked_focus_handle.as_ref() {
1111 if focus_handle.contains_focused(cx) {
1112 style.refine(&self.focus_in_style);
1113 }
1114
1115 if focus_handle.within_focused(cx) {
1116 style.refine(&self.in_focus_style);
1117 }
1118
1119 if focus_handle.is_focused(cx) {
1120 style.refine(&self.focus_style);
1121 }
1122 }
1123
1124 if let Some(bounds) = bounds {
1125 let mouse_position = cx.mouse_position();
1126 if let Some(group_hover) = self.group_hover_style.as_ref() {
1127 if let Some(group_bounds) = GroupBounds::get(&group_hover.group, cx) {
1128 if group_bounds.contains_point(&mouse_position) {
1129 style.refine(&group_hover.style);
1130 }
1131 }
1132 }
1133 if bounds.contains_point(&mouse_position) {
1134 style.refine(&self.hover_style);
1135 }
1136
1137 if let Some(drag) = cx.active_drag.take() {
1138 for (state_type, group_drag_style) in &self.group_drag_over_styles {
1139 if let Some(group_bounds) = GroupBounds::get(&group_drag_style.group, cx) {
1140 if *state_type == drag.view.entity_type()
1141 && group_bounds.contains_point(&mouse_position)
1142 {
1143 style.refine(&group_drag_style.style);
1144 }
1145 }
1146 }
1147
1148 for (state_type, drag_over_style) in &self.drag_over_styles {
1149 if *state_type == drag.view.entity_type()
1150 && bounds.contains_point(&mouse_position)
1151 {
1152 style.refine(drag_over_style);
1153 }
1154 }
1155
1156 cx.active_drag = Some(drag);
1157 }
1158 }
1159
1160 let clicked_state = element_state.clicked_state.lock();
1161 if clicked_state.group {
1162 if let Some(group) = self.group_active_style.as_ref() {
1163 style.refine(&group.style)
1164 }
1165 }
1166
1167 if clicked_state.element {
1168 style.refine(&self.active_style)
1169 }
1170
1171 style
1172 }
1173}
1174
1175impl<V: 'static> Default for Interactivity<V> {
1176 fn default() -> Self {
1177 Self {
1178 element_id: None,
1179 key_context: KeyContext::default(),
1180 focusable: false,
1181 tracked_focus_handle: None,
1182 focus_listeners: SmallVec::default(),
1183 // scroll_offset: Point::default(),
1184 group: None,
1185 base_style: StyleRefinement::default(),
1186 focus_style: StyleRefinement::default(),
1187 focus_in_style: StyleRefinement::default(),
1188 in_focus_style: StyleRefinement::default(),
1189 hover_style: StyleRefinement::default(),
1190 group_hover_style: None,
1191 active_style: StyleRefinement::default(),
1192 group_active_style: None,
1193 drag_over_styles: SmallVec::new(),
1194 group_drag_over_styles: SmallVec::new(),
1195 mouse_down_listeners: SmallVec::new(),
1196 mouse_up_listeners: SmallVec::new(),
1197 mouse_move_listeners: SmallVec::new(),
1198 scroll_wheel_listeners: SmallVec::new(),
1199 key_down_listeners: SmallVec::new(),
1200 key_up_listeners: SmallVec::new(),
1201 action_listeners: SmallVec::new(),
1202 drop_listeners: SmallVec::new(),
1203 click_listeners: SmallVec::new(),
1204 drag_listener: None,
1205 hover_listener: None,
1206 tooltip_builder: None,
1207 }
1208 }
1209}
1210
1211#[derive(Default)]
1212pub struct InteractiveElementState {
1213 pub focus_handle: Option<FocusHandle>,
1214 pub clicked_state: Arc<Mutex<ElementClickedState>>,
1215 pub hover_state: Arc<Mutex<bool>>,
1216 pub pending_mouse_down: Arc<Mutex<Option<MouseDownEvent>>>,
1217 pub scroll_offset: Option<Arc<Mutex<Point<Pixels>>>>,
1218 pub active_tooltip: Arc<Mutex<Option<ActiveTooltip>>>,
1219}
1220
1221pub struct ActiveTooltip {
1222 #[allow(unused)] // used to drop the task
1223 waiting: Option<Task<()>>,
1224 tooltip: Option<AnyTooltip>,
1225}
1226
1227/// Whether or not the element or a group that contains it is clicked by the mouse.
1228#[derive(Copy, Clone, Default, Eq, PartialEq)]
1229pub struct ElementClickedState {
1230 pub group: bool,
1231 pub element: bool,
1232}
1233
1234impl ElementClickedState {
1235 fn is_clicked(&self) -> bool {
1236 self.group || self.element
1237 }
1238}
1239
1240#[derive(Default)]
1241pub struct GroupBounds(HashMap<SharedString, SmallVec<[Bounds<Pixels>; 1]>>);
1242
1243impl GroupBounds {
1244 pub fn get(name: &SharedString, cx: &mut AppContext) -> Option<Bounds<Pixels>> {
1245 cx.default_global::<Self>()
1246 .0
1247 .get(name)
1248 .and_then(|bounds_stack| bounds_stack.last())
1249 .cloned()
1250 }
1251
1252 pub fn push(name: SharedString, bounds: Bounds<Pixels>, cx: &mut AppContext) {
1253 cx.default_global::<Self>()
1254 .0
1255 .entry(name)
1256 .or_default()
1257 .push(bounds);
1258 }
1259
1260 pub fn pop(name: &SharedString, cx: &mut AppContext) {
1261 cx.default_global::<Self>().0.get_mut(name).unwrap().pop();
1262 }
1263}
1264
1265pub struct Focusable<V, E> {
1266 element: E,
1267 view_type: PhantomData<V>,
1268}
1269
1270impl<V: 'static, E: InteractiveComponent<V>> FocusableComponent<V> for Focusable<V, E> {}
1271
1272impl<V, E> InteractiveComponent<V> for Focusable<V, E>
1273where
1274 V: 'static,
1275 E: InteractiveComponent<V>,
1276{
1277 fn interactivity(&mut self) -> &mut Interactivity<V> {
1278 self.element.interactivity()
1279 }
1280}
1281
1282impl<V: 'static, E: StatefulInteractiveComponent<V, E>> StatefulInteractiveComponent<V, E>
1283 for Focusable<V, E>
1284{
1285}
1286
1287impl<V, E> Styled for Focusable<V, E>
1288where
1289 V: 'static,
1290 E: Styled,
1291{
1292 fn style(&mut self) -> &mut StyleRefinement {
1293 self.element.style()
1294 }
1295}
1296
1297impl<V, E> Element<V> for Focusable<V, E>
1298where
1299 V: 'static,
1300 E: Element<V>,
1301{
1302 type ElementState = E::ElementState;
1303
1304 fn element_id(&self) -> Option<ElementId> {
1305 self.element.element_id()
1306 }
1307
1308 fn initialize(
1309 &mut self,
1310 view_state: &mut V,
1311 element_state: Option<Self::ElementState>,
1312 cx: &mut ViewContext<V>,
1313 ) -> Self::ElementState {
1314 self.element.initialize(view_state, element_state, cx)
1315 }
1316
1317 fn layout(
1318 &mut self,
1319 view_state: &mut V,
1320 element_state: &mut Self::ElementState,
1321 cx: &mut ViewContext<V>,
1322 ) -> LayoutId {
1323 self.element.layout(view_state, element_state, cx)
1324 }
1325
1326 fn paint(
1327 &mut self,
1328 bounds: Bounds<Pixels>,
1329 view_state: &mut V,
1330 element_state: &mut Self::ElementState,
1331 cx: &mut ViewContext<V>,
1332 ) {
1333 self.element.paint(bounds, view_state, element_state, cx);
1334 }
1335}
1336
1337impl<V, E> Component<V> for Focusable<V, E>
1338where
1339 V: 'static,
1340 E: 'static + Element<V>,
1341{
1342 fn render(self) -> AnyElement<V> {
1343 AnyElement::new(self)
1344 }
1345}
1346
1347impl<V, E> ParentComponent<V> for Focusable<V, E>
1348where
1349 V: 'static,
1350 E: ParentComponent<V>,
1351{
1352 fn children_mut(&mut self) -> &mut SmallVec<[AnyElement<V>; 2]> {
1353 self.element.children_mut()
1354 }
1355}
1356
1357pub struct Stateful<V, E> {
1358 element: E,
1359 view_type: PhantomData<V>,
1360}
1361
1362impl<V, E> Styled for Stateful<V, E>
1363where
1364 V: 'static,
1365 E: Styled,
1366{
1367 fn style(&mut self) -> &mut StyleRefinement {
1368 self.element.style()
1369 }
1370}
1371
1372impl<V, E> StatefulInteractiveComponent<V, E> for Stateful<V, E>
1373where
1374 V: 'static,
1375 E: Element<V>,
1376 Self: InteractiveComponent<V>,
1377{
1378}
1379
1380impl<V, E> InteractiveComponent<V> for Stateful<V, E>
1381where
1382 V: 'static,
1383 E: InteractiveComponent<V>,
1384{
1385 fn interactivity(&mut self) -> &mut Interactivity<V> {
1386 self.element.interactivity()
1387 }
1388}
1389
1390impl<V: 'static, E: FocusableComponent<V>> FocusableComponent<V> for Stateful<V, E> {}
1391
1392impl<V, E> Element<V> for Stateful<V, E>
1393where
1394 V: 'static,
1395 E: Element<V>,
1396{
1397 type ElementState = E::ElementState;
1398
1399 fn element_id(&self) -> Option<ElementId> {
1400 self.element.element_id()
1401 }
1402
1403 fn initialize(
1404 &mut self,
1405 view_state: &mut V,
1406 element_state: Option<Self::ElementState>,
1407 cx: &mut ViewContext<V>,
1408 ) -> Self::ElementState {
1409 self.element.initialize(view_state, element_state, cx)
1410 }
1411
1412 fn layout(
1413 &mut self,
1414 view_state: &mut V,
1415 element_state: &mut Self::ElementState,
1416 cx: &mut ViewContext<V>,
1417 ) -> LayoutId {
1418 self.element.layout(view_state, element_state, cx)
1419 }
1420
1421 fn paint(
1422 &mut self,
1423 bounds: Bounds<Pixels>,
1424 view_state: &mut V,
1425 element_state: &mut Self::ElementState,
1426 cx: &mut ViewContext<V>,
1427 ) {
1428 self.element.paint(bounds, view_state, element_state, cx)
1429 }
1430}
1431
1432impl<V, E> Component<V> for Stateful<V, E>
1433where
1434 V: 'static,
1435 E: 'static + Element<V>,
1436{
1437 fn render(self) -> AnyElement<V> {
1438 AnyElement::new(self)
1439 }
1440}
1441
1442impl<V, E> ParentComponent<V> for Stateful<V, E>
1443where
1444 V: 'static,
1445 E: ParentComponent<V>,
1446{
1447 fn children_mut(&mut self) -> &mut SmallVec<[AnyElement<V>; 2]> {
1448 self.element.children_mut()
1449 }
1450}