1pub mod action;
2mod callback_collection;
3
4use crate::{
5 elements::ElementBox,
6 executor::{self, Task},
7 geometry::rect::RectF,
8 keymap::{self, Binding, Keystroke},
9 platform::{self, KeyDownEvent, Platform, PromptLevel, WindowOptions},
10 presenter::Presenter,
11 util::post_inc,
12 AssetCache, AssetSource, ClipboardItem, FontCache, InputHandler, MouseButton, MouseRegionId,
13 PathPromptOptions, TextLayoutCache,
14};
15pub use action::*;
16use anyhow::{anyhow, Context, Result};
17use callback_collection::CallbackCollection;
18use collections::{btree_map, hash_map::Entry, BTreeMap, HashMap, HashSet, VecDeque};
19use keymap::MatchResult;
20use lazy_static::lazy_static;
21use parking_lot::Mutex;
22use platform::Event;
23use postage::oneshot;
24use smallvec::SmallVec;
25use smol::prelude::*;
26use std::{
27 any::{type_name, Any, TypeId},
28 cell::RefCell,
29 fmt::{self, Debug},
30 hash::{Hash, Hasher},
31 marker::PhantomData,
32 mem,
33 ops::{Deref, DerefMut, Range},
34 path::{Path, PathBuf},
35 pin::Pin,
36 rc::{self, Rc},
37 sync::{Arc, Weak},
38 time::Duration,
39};
40
41use self::callback_collection::Mapping;
42
43pub trait Entity: 'static {
44 type Event;
45
46 fn release(&mut self, _: &mut MutableAppContext) {}
47 fn app_will_quit(
48 &mut self,
49 _: &mut MutableAppContext,
50 ) -> Option<Pin<Box<dyn 'static + Future<Output = ()>>>> {
51 None
52 }
53}
54
55pub trait View: Entity + Sized {
56 fn ui_name() -> &'static str;
57 fn render(&mut self, cx: &mut RenderContext<'_, Self>) -> ElementBox;
58 fn on_focus_in(&mut self, _: AnyViewHandle, _: &mut ViewContext<Self>) {}
59 fn on_focus_out(&mut self, _: AnyViewHandle, _: &mut ViewContext<Self>) {}
60 fn keymap_context(&self, _: &AppContext) -> keymap::Context {
61 Self::default_keymap_context()
62 }
63 fn default_keymap_context() -> keymap::Context {
64 let mut cx = keymap::Context::default();
65 cx.set.insert(Self::ui_name().into());
66 cx
67 }
68 fn debug_json(&self, _: &AppContext) -> serde_json::Value {
69 serde_json::Value::Null
70 }
71
72 fn text_for_range(&self, _: Range<usize>, _: &AppContext) -> Option<String> {
73 None
74 }
75 fn selected_text_range(&self, _: &AppContext) -> Option<Range<usize>> {
76 None
77 }
78 fn marked_text_range(&self, _: &AppContext) -> Option<Range<usize>> {
79 None
80 }
81 fn unmark_text(&mut self, _: &mut ViewContext<Self>) {}
82 fn replace_text_in_range(
83 &mut self,
84 _: Option<Range<usize>>,
85 _: &str,
86 _: &mut ViewContext<Self>,
87 ) {
88 }
89 fn replace_and_mark_text_in_range(
90 &mut self,
91 _: Option<Range<usize>>,
92 _: &str,
93 _: Option<Range<usize>>,
94 _: &mut ViewContext<Self>,
95 ) {
96 }
97}
98
99pub trait ReadModel {
100 fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T;
101}
102
103pub trait ReadModelWith {
104 fn read_model_with<E: Entity, T>(
105 &self,
106 handle: &ModelHandle<E>,
107 read: &mut dyn FnMut(&E, &AppContext) -> T,
108 ) -> T;
109}
110
111pub trait UpdateModel {
112 fn update_model<T: Entity, O>(
113 &mut self,
114 handle: &ModelHandle<T>,
115 update: &mut dyn FnMut(&mut T, &mut ModelContext<T>) -> O,
116 ) -> O;
117}
118
119pub trait UpgradeModelHandle {
120 fn upgrade_model_handle<T: Entity>(
121 &self,
122 handle: &WeakModelHandle<T>,
123 ) -> Option<ModelHandle<T>>;
124
125 fn model_handle_is_upgradable<T: Entity>(&self, handle: &WeakModelHandle<T>) -> bool;
126
127 fn upgrade_any_model_handle(&self, handle: &AnyWeakModelHandle) -> Option<AnyModelHandle>;
128}
129
130pub trait UpgradeViewHandle {
131 fn upgrade_view_handle<T: View>(&self, handle: &WeakViewHandle<T>) -> Option<ViewHandle<T>>;
132
133 fn upgrade_any_view_handle(&self, handle: &AnyWeakViewHandle) -> Option<AnyViewHandle>;
134}
135
136pub trait ReadView {
137 fn read_view<T: View>(&self, handle: &ViewHandle<T>) -> &T;
138}
139
140pub trait ReadViewWith {
141 fn read_view_with<V, T>(
142 &self,
143 handle: &ViewHandle<V>,
144 read: &mut dyn FnMut(&V, &AppContext) -> T,
145 ) -> T
146 where
147 V: View;
148}
149
150pub trait UpdateView {
151 fn update_view<T, S>(
152 &mut self,
153 handle: &ViewHandle<T>,
154 update: &mut dyn FnMut(&mut T, &mut ViewContext<T>) -> S,
155 ) -> S
156 where
157 T: View;
158}
159
160pub struct Menu<'a> {
161 pub name: &'a str,
162 pub items: Vec<MenuItem<'a>>,
163}
164
165pub enum MenuItem<'a> {
166 Separator,
167 Submenu(Menu<'a>),
168 Action {
169 name: &'a str,
170 action: Box<dyn Action>,
171 },
172}
173
174#[derive(Clone)]
175pub struct App(Rc<RefCell<MutableAppContext>>);
176
177#[derive(Clone)]
178pub struct AsyncAppContext(Rc<RefCell<MutableAppContext>>);
179
180#[cfg(any(test, feature = "test-support"))]
181pub struct TestAppContext {
182 cx: Rc<RefCell<MutableAppContext>>,
183 foreground_platform: Rc<platform::test::ForegroundPlatform>,
184 condition_duration: Option<Duration>,
185}
186
187pub struct WindowInputHandler {
188 app: Rc<RefCell<MutableAppContext>>,
189 window_id: usize,
190}
191
192impl App {
193 pub fn new(asset_source: impl AssetSource) -> Result<Self> {
194 let platform = platform::current::platform();
195 let foreground_platform = platform::current::foreground_platform();
196 let foreground = Rc::new(executor::Foreground::platform(platform.dispatcher())?);
197 let app = Self(Rc::new(RefCell::new(MutableAppContext::new(
198 foreground,
199 Arc::new(executor::Background::new()),
200 platform.clone(),
201 foreground_platform.clone(),
202 Arc::new(FontCache::new(platform.fonts())),
203 Default::default(),
204 asset_source,
205 ))));
206
207 foreground_platform.on_quit(Box::new({
208 let cx = app.0.clone();
209 move || {
210 cx.borrow_mut().quit();
211 }
212 }));
213 foreground_platform.on_will_open_menu(Box::new({
214 let cx = app.0.clone();
215 move || {
216 let mut cx = cx.borrow_mut();
217 cx.keystroke_matcher.clear_pending();
218 }
219 }));
220 foreground_platform.on_validate_menu_command(Box::new({
221 let cx = app.0.clone();
222 move |action| {
223 let cx = cx.borrow_mut();
224 !cx.keystroke_matcher.has_pending_keystrokes() && cx.is_action_available(action)
225 }
226 }));
227 foreground_platform.on_menu_command(Box::new({
228 let cx = app.0.clone();
229 move |action| {
230 let mut cx = cx.borrow_mut();
231 if let Some(key_window_id) = cx.cx.platform.key_window_id() {
232 if let Some(view_id) = cx.focused_view_id(key_window_id) {
233 cx.handle_dispatch_action_from_effect(key_window_id, Some(view_id), action);
234 return;
235 }
236 }
237 cx.dispatch_global_action_any(action);
238 }
239 }));
240
241 app.0.borrow_mut().weak_self = Some(Rc::downgrade(&app.0));
242 Ok(app)
243 }
244
245 pub fn background(&self) -> Arc<executor::Background> {
246 self.0.borrow().background().clone()
247 }
248
249 pub fn on_become_active<F>(self, mut callback: F) -> Self
250 where
251 F: 'static + FnMut(&mut MutableAppContext),
252 {
253 let cx = self.0.clone();
254 self.0
255 .borrow_mut()
256 .foreground_platform
257 .on_become_active(Box::new(move || callback(&mut *cx.borrow_mut())));
258 self
259 }
260
261 pub fn on_resign_active<F>(self, mut callback: F) -> Self
262 where
263 F: 'static + FnMut(&mut MutableAppContext),
264 {
265 let cx = self.0.clone();
266 self.0
267 .borrow_mut()
268 .foreground_platform
269 .on_resign_active(Box::new(move || callback(&mut *cx.borrow_mut())));
270 self
271 }
272
273 pub fn on_quit<F>(&mut self, mut callback: F) -> &mut Self
274 where
275 F: 'static + FnMut(&mut MutableAppContext),
276 {
277 let cx = self.0.clone();
278 self.0
279 .borrow_mut()
280 .foreground_platform
281 .on_quit(Box::new(move || callback(&mut *cx.borrow_mut())));
282 self
283 }
284
285 pub fn on_event<F>(&mut self, mut callback: F) -> &mut Self
286 where
287 F: 'static + FnMut(Event, &mut MutableAppContext) -> bool,
288 {
289 let cx = self.0.clone();
290 self.0
291 .borrow_mut()
292 .foreground_platform
293 .on_event(Box::new(move |event| {
294 callback(event, &mut *cx.borrow_mut())
295 }));
296 self
297 }
298
299 pub fn on_open_urls<F>(&mut self, mut callback: F) -> &mut Self
300 where
301 F: 'static + FnMut(Vec<String>, &mut MutableAppContext),
302 {
303 let cx = self.0.clone();
304 self.0
305 .borrow_mut()
306 .foreground_platform
307 .on_open_urls(Box::new(move |paths| {
308 callback(paths, &mut *cx.borrow_mut())
309 }));
310 self
311 }
312
313 pub fn run<F>(self, on_finish_launching: F)
314 where
315 F: 'static + FnOnce(&mut MutableAppContext),
316 {
317 let platform = self.0.borrow().foreground_platform.clone();
318 platform.run(Box::new(move || {
319 let mut cx = self.0.borrow_mut();
320 let cx = &mut *cx;
321 crate::views::init(cx);
322 on_finish_launching(cx);
323 }))
324 }
325
326 pub fn platform(&self) -> Arc<dyn Platform> {
327 self.0.borrow().platform()
328 }
329
330 pub fn font_cache(&self) -> Arc<FontCache> {
331 self.0.borrow().cx.font_cache.clone()
332 }
333
334 fn update<T, F: FnOnce(&mut MutableAppContext) -> T>(&mut self, callback: F) -> T {
335 let mut state = self.0.borrow_mut();
336 let result = state.update(callback);
337 state.pending_notifications.clear();
338 result
339 }
340}
341
342impl WindowInputHandler {
343 fn read_focused_view<T, F>(&self, f: F) -> Option<T>
344 where
345 F: FnOnce(&dyn AnyView, &AppContext) -> T,
346 {
347 // Input-related application hooks are sometimes called by the OS during
348 // a call to a window-manipulation API, like prompting the user for file
349 // paths. In that case, the AppContext will already be borrowed, so any
350 // InputHandler methods need to fail gracefully.
351 //
352 // See https://github.com/zed-industries/feedback/issues/444
353 let app = self.app.try_borrow().ok()?;
354
355 let view_id = app.focused_view_id(self.window_id)?;
356 let view = app.cx.views.get(&(self.window_id, view_id))?;
357 let result = f(view.as_ref(), &app);
358 Some(result)
359 }
360
361 fn update_focused_view<T, F>(&mut self, f: F) -> Option<T>
362 where
363 F: FnOnce(usize, usize, &mut dyn AnyView, &mut MutableAppContext) -> T,
364 {
365 let mut app = self.app.try_borrow_mut().ok()?;
366 app.update(|app| {
367 let view_id = app.focused_view_id(self.window_id)?;
368 let mut view = app.cx.views.remove(&(self.window_id, view_id))?;
369 let result = f(self.window_id, view_id, view.as_mut(), &mut *app);
370 app.cx.views.insert((self.window_id, view_id), view);
371 Some(result)
372 })
373 }
374}
375
376impl InputHandler for WindowInputHandler {
377 fn text_for_range(&self, range: Range<usize>) -> Option<String> {
378 self.read_focused_view(|view, cx| view.text_for_range(range.clone(), cx))
379 .flatten()
380 }
381
382 fn selected_text_range(&self) -> Option<Range<usize>> {
383 self.read_focused_view(|view, cx| view.selected_text_range(cx))
384 .flatten()
385 }
386
387 fn replace_text_in_range(&mut self, range: Option<Range<usize>>, text: &str) {
388 self.update_focused_view(|window_id, view_id, view, cx| {
389 view.replace_text_in_range(range, text, cx, window_id, view_id);
390 });
391 }
392
393 fn marked_text_range(&self) -> Option<Range<usize>> {
394 self.read_focused_view(|view, cx| view.marked_text_range(cx))
395 .flatten()
396 }
397
398 fn unmark_text(&mut self) {
399 self.update_focused_view(|window_id, view_id, view, cx| {
400 view.unmark_text(cx, window_id, view_id);
401 });
402 }
403
404 fn replace_and_mark_text_in_range(
405 &mut self,
406 range: Option<Range<usize>>,
407 new_text: &str,
408 new_selected_range: Option<Range<usize>>,
409 ) {
410 self.update_focused_view(|window_id, view_id, view, cx| {
411 view.replace_and_mark_text_in_range(
412 range,
413 new_text,
414 new_selected_range,
415 cx,
416 window_id,
417 view_id,
418 );
419 });
420 }
421
422 fn rect_for_range(&self, range_utf16: Range<usize>) -> Option<RectF> {
423 let app = self.app.borrow();
424 let (presenter, _) = app.presenters_and_platform_windows.get(&self.window_id)?;
425 let presenter = presenter.borrow();
426 presenter.rect_for_text_range(range_utf16, &app)
427 }
428}
429
430#[cfg(any(test, feature = "test-support"))]
431impl TestAppContext {
432 pub fn new(
433 foreground_platform: Rc<platform::test::ForegroundPlatform>,
434 platform: Arc<dyn Platform>,
435 foreground: Rc<executor::Foreground>,
436 background: Arc<executor::Background>,
437 font_cache: Arc<FontCache>,
438 leak_detector: Arc<Mutex<LeakDetector>>,
439 first_entity_id: usize,
440 ) -> Self {
441 let mut cx = MutableAppContext::new(
442 foreground,
443 background,
444 platform,
445 foreground_platform.clone(),
446 font_cache,
447 RefCounts {
448 #[cfg(any(test, feature = "test-support"))]
449 leak_detector,
450 ..Default::default()
451 },
452 (),
453 );
454 cx.next_entity_id = first_entity_id;
455 let cx = TestAppContext {
456 cx: Rc::new(RefCell::new(cx)),
457 foreground_platform,
458 condition_duration: None,
459 };
460 cx.cx.borrow_mut().weak_self = Some(Rc::downgrade(&cx.cx));
461 cx
462 }
463
464 pub fn dispatch_action<A: Action>(&self, window_id: usize, action: A) {
465 let mut cx = self.cx.borrow_mut();
466 if let Some(view_id) = cx.focused_view_id(window_id) {
467 cx.handle_dispatch_action_from_effect(window_id, Some(view_id), &action);
468 }
469 }
470
471 pub fn dispatch_global_action<A: Action>(&self, action: A) {
472 self.cx.borrow_mut().dispatch_global_action(action);
473 }
474
475 pub fn dispatch_keystroke(&mut self, window_id: usize, keystroke: Keystroke, is_held: bool) {
476 let handled = self.cx.borrow_mut().update(|cx| {
477 let presenter = cx
478 .presenters_and_platform_windows
479 .get(&window_id)
480 .unwrap()
481 .0
482 .clone();
483
484 if cx.dispatch_keystroke(window_id, &keystroke) {
485 return true;
486 }
487
488 if presenter.borrow_mut().dispatch_event(
489 Event::KeyDown(KeyDownEvent {
490 keystroke: keystroke.clone(),
491 is_held,
492 }),
493 false,
494 cx,
495 ) {
496 return true;
497 }
498
499 false
500 });
501
502 if !handled && !keystroke.cmd && !keystroke.ctrl {
503 WindowInputHandler {
504 app: self.cx.clone(),
505 window_id,
506 }
507 .replace_text_in_range(None, &keystroke.key)
508 }
509 }
510
511 pub fn add_model<T, F>(&mut self, build_model: F) -> ModelHandle<T>
512 where
513 T: Entity,
514 F: FnOnce(&mut ModelContext<T>) -> T,
515 {
516 self.cx.borrow_mut().add_model(build_model)
517 }
518
519 pub fn add_window<T, F>(&mut self, build_root_view: F) -> (usize, ViewHandle<T>)
520 where
521 T: View,
522 F: FnOnce(&mut ViewContext<T>) -> T,
523 {
524 let (window_id, view) = self
525 .cx
526 .borrow_mut()
527 .add_window(Default::default(), build_root_view);
528 self.simulate_window_activation(Some(window_id));
529 (window_id, view)
530 }
531
532 pub fn add_view<T, F>(
533 &mut self,
534 parent_handle: impl Into<AnyViewHandle>,
535 build_view: F,
536 ) -> ViewHandle<T>
537 where
538 T: View,
539 F: FnOnce(&mut ViewContext<T>) -> T,
540 {
541 self.cx.borrow_mut().add_view(parent_handle, build_view)
542 }
543
544 pub fn window_ids(&self) -> Vec<usize> {
545 self.cx.borrow().window_ids().collect()
546 }
547
548 pub fn root_view<T: View>(&self, window_id: usize) -> Option<ViewHandle<T>> {
549 self.cx.borrow().root_view(window_id)
550 }
551
552 pub fn read<T, F: FnOnce(&AppContext) -> T>(&self, callback: F) -> T {
553 callback(self.cx.borrow().as_ref())
554 }
555
556 pub fn update<T, F: FnOnce(&mut MutableAppContext) -> T>(&mut self, callback: F) -> T {
557 let mut state = self.cx.borrow_mut();
558 // Don't increment pending flushes in order for effects to be flushed before the callback
559 // completes, which is helpful in tests.
560 let result = callback(&mut *state);
561 // Flush effects after the callback just in case there are any. This can happen in edge
562 // cases such as the closure dropping handles.
563 state.flush_effects();
564 result
565 }
566
567 pub fn render<F, V, T>(&mut self, handle: &ViewHandle<V>, f: F) -> T
568 where
569 F: FnOnce(&mut V, &mut RenderContext<V>) -> T,
570 V: View,
571 {
572 handle.update(&mut *self.cx.borrow_mut(), |view, cx| {
573 let mut render_cx = RenderContext {
574 app: cx,
575 window_id: handle.window_id(),
576 view_id: handle.id(),
577 view_type: PhantomData,
578 titlebar_height: 0.,
579 hovered_region_ids: Default::default(),
580 clicked_region_ids: None,
581 refreshing: false,
582 };
583 f(view, &mut render_cx)
584 })
585 }
586
587 pub fn to_async(&self) -> AsyncAppContext {
588 AsyncAppContext(self.cx.clone())
589 }
590
591 pub fn font_cache(&self) -> Arc<FontCache> {
592 self.cx.borrow().cx.font_cache.clone()
593 }
594
595 pub fn foreground_platform(&self) -> Rc<platform::test::ForegroundPlatform> {
596 self.foreground_platform.clone()
597 }
598
599 pub fn platform(&self) -> Arc<dyn platform::Platform> {
600 self.cx.borrow().cx.platform.clone()
601 }
602
603 pub fn foreground(&self) -> Rc<executor::Foreground> {
604 self.cx.borrow().foreground().clone()
605 }
606
607 pub fn background(&self) -> Arc<executor::Background> {
608 self.cx.borrow().background().clone()
609 }
610
611 pub fn spawn<F, Fut, T>(&self, f: F) -> Task<T>
612 where
613 F: FnOnce(AsyncAppContext) -> Fut,
614 Fut: 'static + Future<Output = T>,
615 T: 'static,
616 {
617 let foreground = self.foreground();
618 let future = f(self.to_async());
619 let cx = self.to_async();
620 foreground.spawn(async move {
621 let result = future.await;
622 cx.0.borrow_mut().flush_effects();
623 result
624 })
625 }
626
627 pub fn simulate_new_path_selection(&self, result: impl FnOnce(PathBuf) -> Option<PathBuf>) {
628 self.foreground_platform.simulate_new_path_selection(result);
629 }
630
631 pub fn did_prompt_for_new_path(&self) -> bool {
632 self.foreground_platform.as_ref().did_prompt_for_new_path()
633 }
634
635 pub fn simulate_prompt_answer(&self, window_id: usize, answer: usize) {
636 use postage::prelude::Sink as _;
637
638 let mut done_tx = self
639 .window_mut(window_id)
640 .pending_prompts
641 .borrow_mut()
642 .pop_front()
643 .expect("prompt was not called");
644 let _ = done_tx.try_send(answer);
645 }
646
647 pub fn has_pending_prompt(&self, window_id: usize) -> bool {
648 let window = self.window_mut(window_id);
649 let prompts = window.pending_prompts.borrow_mut();
650 !prompts.is_empty()
651 }
652
653 pub fn current_window_title(&self, window_id: usize) -> Option<String> {
654 self.window_mut(window_id).title.clone()
655 }
656
657 pub fn simulate_window_close(&self, window_id: usize) -> bool {
658 let handler = self.window_mut(window_id).should_close_handler.take();
659 if let Some(mut handler) = handler {
660 let should_close = handler();
661 self.window_mut(window_id).should_close_handler = Some(handler);
662 should_close
663 } else {
664 false
665 }
666 }
667
668 pub fn simulate_window_activation(&self, to_activate: Option<usize>) {
669 let mut handlers = BTreeMap::new();
670 {
671 let mut cx = self.cx.borrow_mut();
672 for (window_id, (_, window)) in &mut cx.presenters_and_platform_windows {
673 let window = window
674 .as_any_mut()
675 .downcast_mut::<platform::test::Window>()
676 .unwrap();
677 handlers.insert(
678 *window_id,
679 mem::take(&mut window.active_status_change_handlers),
680 );
681 }
682 };
683 let mut handlers = handlers.into_iter().collect::<Vec<_>>();
684 handlers.sort_unstable_by_key(|(window_id, _)| Some(*window_id) == to_activate);
685
686 for (window_id, mut window_handlers) in handlers {
687 for window_handler in &mut window_handlers {
688 window_handler(Some(window_id) == to_activate);
689 }
690
691 self.window_mut(window_id)
692 .active_status_change_handlers
693 .extend(window_handlers);
694 }
695 }
696
697 pub fn is_window_edited(&self, window_id: usize) -> bool {
698 self.window_mut(window_id).edited
699 }
700
701 pub fn leak_detector(&self) -> Arc<Mutex<LeakDetector>> {
702 self.cx.borrow().leak_detector()
703 }
704
705 pub fn assert_dropped(&self, handle: impl WeakHandle) {
706 self.cx
707 .borrow()
708 .leak_detector()
709 .lock()
710 .assert_dropped(handle.id())
711 }
712
713 fn window_mut(&self, window_id: usize) -> std::cell::RefMut<platform::test::Window> {
714 std::cell::RefMut::map(self.cx.borrow_mut(), |state| {
715 let (_, window) = state
716 .presenters_and_platform_windows
717 .get_mut(&window_id)
718 .unwrap();
719 let test_window = window
720 .as_any_mut()
721 .downcast_mut::<platform::test::Window>()
722 .unwrap();
723 test_window
724 })
725 }
726
727 pub fn set_condition_duration(&mut self, duration: Option<Duration>) {
728 self.condition_duration = duration;
729 }
730
731 pub fn condition_duration(&self) -> Duration {
732 self.condition_duration.unwrap_or_else(|| {
733 if std::env::var("CI").is_ok() {
734 Duration::from_secs(2)
735 } else {
736 Duration::from_millis(500)
737 }
738 })
739 }
740
741 pub fn assert_clipboard_content(&mut self, expected_content: Option<&str>) {
742 self.update(|cx| {
743 let actual_content = cx.read_from_clipboard().map(|item| item.text().to_owned());
744 let expected_content = expected_content.map(|content| content.to_owned());
745 assert_eq!(actual_content, expected_content);
746 })
747 }
748}
749
750impl AsyncAppContext {
751 pub fn spawn<F, Fut, T>(&self, f: F) -> Task<T>
752 where
753 F: FnOnce(AsyncAppContext) -> Fut,
754 Fut: 'static + Future<Output = T>,
755 T: 'static,
756 {
757 self.0.borrow().foreground.spawn(f(self.clone()))
758 }
759
760 pub fn read<T, F: FnOnce(&AppContext) -> T>(&self, callback: F) -> T {
761 callback(self.0.borrow().as_ref())
762 }
763
764 pub fn update<T, F: FnOnce(&mut MutableAppContext) -> T>(&mut self, callback: F) -> T {
765 self.0.borrow_mut().update(callback)
766 }
767
768 pub fn add_model<T, F>(&mut self, build_model: F) -> ModelHandle<T>
769 where
770 T: Entity,
771 F: FnOnce(&mut ModelContext<T>) -> T,
772 {
773 self.update(|cx| cx.add_model(build_model))
774 }
775
776 pub fn add_window<T, F>(
777 &mut self,
778 window_options: WindowOptions,
779 build_root_view: F,
780 ) -> (usize, ViewHandle<T>)
781 where
782 T: View,
783 F: FnOnce(&mut ViewContext<T>) -> T,
784 {
785 self.update(|cx| cx.add_window(window_options, build_root_view))
786 }
787
788 pub fn platform(&self) -> Arc<dyn Platform> {
789 self.0.borrow().platform()
790 }
791
792 pub fn foreground(&self) -> Rc<executor::Foreground> {
793 self.0.borrow().foreground.clone()
794 }
795
796 pub fn background(&self) -> Arc<executor::Background> {
797 self.0.borrow().cx.background.clone()
798 }
799}
800
801impl UpdateModel for AsyncAppContext {
802 fn update_model<E: Entity, O>(
803 &mut self,
804 handle: &ModelHandle<E>,
805 update: &mut dyn FnMut(&mut E, &mut ModelContext<E>) -> O,
806 ) -> O {
807 self.0.borrow_mut().update_model(handle, update)
808 }
809}
810
811impl UpgradeModelHandle for AsyncAppContext {
812 fn upgrade_model_handle<T: Entity>(
813 &self,
814 handle: &WeakModelHandle<T>,
815 ) -> Option<ModelHandle<T>> {
816 self.0.borrow().upgrade_model_handle(handle)
817 }
818
819 fn model_handle_is_upgradable<T: Entity>(&self, handle: &WeakModelHandle<T>) -> bool {
820 self.0.borrow().model_handle_is_upgradable(handle)
821 }
822
823 fn upgrade_any_model_handle(&self, handle: &AnyWeakModelHandle) -> Option<AnyModelHandle> {
824 self.0.borrow().upgrade_any_model_handle(handle)
825 }
826}
827
828impl UpgradeViewHandle for AsyncAppContext {
829 fn upgrade_view_handle<T: View>(&self, handle: &WeakViewHandle<T>) -> Option<ViewHandle<T>> {
830 self.0.borrow_mut().upgrade_view_handle(handle)
831 }
832
833 fn upgrade_any_view_handle(&self, handle: &AnyWeakViewHandle) -> Option<AnyViewHandle> {
834 self.0.borrow_mut().upgrade_any_view_handle(handle)
835 }
836}
837
838impl ReadModelWith for AsyncAppContext {
839 fn read_model_with<E: Entity, T>(
840 &self,
841 handle: &ModelHandle<E>,
842 read: &mut dyn FnMut(&E, &AppContext) -> T,
843 ) -> T {
844 let cx = self.0.borrow();
845 let cx = cx.as_ref();
846 read(handle.read(cx), cx)
847 }
848}
849
850impl UpdateView for AsyncAppContext {
851 fn update_view<T, S>(
852 &mut self,
853 handle: &ViewHandle<T>,
854 update: &mut dyn FnMut(&mut T, &mut ViewContext<T>) -> S,
855 ) -> S
856 where
857 T: View,
858 {
859 self.0.borrow_mut().update_view(handle, update)
860 }
861}
862
863impl ReadViewWith for AsyncAppContext {
864 fn read_view_with<V, T>(
865 &self,
866 handle: &ViewHandle<V>,
867 read: &mut dyn FnMut(&V, &AppContext) -> T,
868 ) -> T
869 where
870 V: View,
871 {
872 let cx = self.0.borrow();
873 let cx = cx.as_ref();
874 read(handle.read(cx), cx)
875 }
876}
877
878#[cfg(any(test, feature = "test-support"))]
879impl UpdateModel for TestAppContext {
880 fn update_model<T: Entity, O>(
881 &mut self,
882 handle: &ModelHandle<T>,
883 update: &mut dyn FnMut(&mut T, &mut ModelContext<T>) -> O,
884 ) -> O {
885 self.cx.borrow_mut().update_model(handle, update)
886 }
887}
888
889#[cfg(any(test, feature = "test-support"))]
890impl ReadModelWith for TestAppContext {
891 fn read_model_with<E: Entity, T>(
892 &self,
893 handle: &ModelHandle<E>,
894 read: &mut dyn FnMut(&E, &AppContext) -> T,
895 ) -> T {
896 let cx = self.cx.borrow();
897 let cx = cx.as_ref();
898 read(handle.read(cx), cx)
899 }
900}
901
902#[cfg(any(test, feature = "test-support"))]
903impl UpdateView for TestAppContext {
904 fn update_view<T, S>(
905 &mut self,
906 handle: &ViewHandle<T>,
907 update: &mut dyn FnMut(&mut T, &mut ViewContext<T>) -> S,
908 ) -> S
909 where
910 T: View,
911 {
912 self.cx.borrow_mut().update_view(handle, update)
913 }
914}
915
916#[cfg(any(test, feature = "test-support"))]
917impl ReadViewWith for TestAppContext {
918 fn read_view_with<V, T>(
919 &self,
920 handle: &ViewHandle<V>,
921 read: &mut dyn FnMut(&V, &AppContext) -> T,
922 ) -> T
923 where
924 V: View,
925 {
926 let cx = self.cx.borrow();
927 let cx = cx.as_ref();
928 read(handle.read(cx), cx)
929 }
930}
931
932type ActionCallback =
933 dyn FnMut(&mut dyn AnyView, &dyn Action, &mut MutableAppContext, usize, usize);
934type GlobalActionCallback = dyn FnMut(&dyn Action, &mut MutableAppContext);
935
936type SubscriptionCallback = Box<dyn FnMut(&dyn Any, &mut MutableAppContext) -> bool>;
937type GlobalSubscriptionCallback = Box<dyn FnMut(&dyn Any, &mut MutableAppContext)>;
938type ObservationCallback = Box<dyn FnMut(&mut MutableAppContext) -> bool>;
939type FocusObservationCallback = Box<dyn FnMut(bool, &mut MutableAppContext) -> bool>;
940type GlobalObservationCallback = Box<dyn FnMut(&mut MutableAppContext)>;
941type ReleaseObservationCallback = Box<dyn FnOnce(&dyn Any, &mut MutableAppContext)>;
942type ActionObservationCallback = Box<dyn FnMut(TypeId, &mut MutableAppContext)>;
943type WindowActivationCallback = Box<dyn FnMut(bool, &mut MutableAppContext) -> bool>;
944type WindowFullscreenCallback = Box<dyn FnMut(bool, &mut MutableAppContext) -> bool>;
945type DeserializeActionCallback = fn(json: &str) -> anyhow::Result<Box<dyn Action>>;
946type WindowShouldCloseSubscriptionCallback = Box<dyn FnMut(&mut MutableAppContext) -> bool>;
947
948pub struct MutableAppContext {
949 weak_self: Option<rc::Weak<RefCell<Self>>>,
950 foreground_platform: Rc<dyn platform::ForegroundPlatform>,
951 assets: Arc<AssetCache>,
952 cx: AppContext,
953 action_deserializers: HashMap<&'static str, (TypeId, DeserializeActionCallback)>,
954 capture_actions: HashMap<TypeId, HashMap<TypeId, Vec<Box<ActionCallback>>>>,
955 actions: HashMap<TypeId, HashMap<TypeId, Vec<Box<ActionCallback>>>>,
956 global_actions: HashMap<TypeId, Box<GlobalActionCallback>>,
957 keystroke_matcher: keymap::Matcher,
958 next_entity_id: usize,
959 next_window_id: usize,
960 next_subscription_id: usize,
961 frame_count: usize,
962
963 focus_observations: CallbackCollection<usize, FocusObservationCallback>,
964 global_subscriptions: CallbackCollection<TypeId, GlobalSubscriptionCallback>,
965 global_observations: CallbackCollection<TypeId, GlobalObservationCallback>,
966 subscriptions: CallbackCollection<usize, SubscriptionCallback>,
967 observations: CallbackCollection<usize, ObservationCallback>,
968 window_activation_observations: CallbackCollection<usize, WindowActivationCallback>,
969 window_fullscreen_observations: CallbackCollection<usize, WindowFullscreenCallback>,
970
971 release_observations: Arc<Mutex<HashMap<usize, BTreeMap<usize, ReleaseObservationCallback>>>>,
972 action_dispatch_observations: Arc<Mutex<BTreeMap<usize, ActionObservationCallback>>>,
973
974 #[allow(clippy::type_complexity)]
975 presenters_and_platform_windows:
976 HashMap<usize, (Rc<RefCell<Presenter>>, Box<dyn platform::Window>)>,
977 foreground: Rc<executor::Foreground>,
978 pending_effects: VecDeque<Effect>,
979 pending_focus_index: Option<usize>,
980 pending_notifications: HashSet<usize>,
981 pending_global_notifications: HashSet<TypeId>,
982 pending_flushes: usize,
983 flushing_effects: bool,
984 halt_action_dispatch: bool,
985}
986
987impl MutableAppContext {
988 fn new(
989 foreground: Rc<executor::Foreground>,
990 background: Arc<executor::Background>,
991 platform: Arc<dyn platform::Platform>,
992 foreground_platform: Rc<dyn platform::ForegroundPlatform>,
993 font_cache: Arc<FontCache>,
994 ref_counts: RefCounts,
995 asset_source: impl AssetSource,
996 ) -> Self {
997 Self {
998 weak_self: None,
999 foreground_platform,
1000 assets: Arc::new(AssetCache::new(asset_source)),
1001 cx: AppContext {
1002 models: Default::default(),
1003 views: Default::default(),
1004 parents: Default::default(),
1005 windows: Default::default(),
1006 globals: Default::default(),
1007 element_states: Default::default(),
1008 ref_counts: Arc::new(Mutex::new(ref_counts)),
1009 background,
1010 font_cache,
1011 platform,
1012 },
1013 action_deserializers: Default::default(),
1014 capture_actions: Default::default(),
1015 actions: Default::default(),
1016 global_actions: Default::default(),
1017 keystroke_matcher: keymap::Matcher::default(),
1018 next_entity_id: 0,
1019 next_window_id: 0,
1020 next_subscription_id: 0,
1021 frame_count: 0,
1022 subscriptions: Default::default(),
1023 global_subscriptions: Default::default(),
1024 observations: Default::default(),
1025 focus_observations: Default::default(),
1026 release_observations: Default::default(),
1027 global_observations: Default::default(),
1028 window_activation_observations: Default::default(),
1029 window_fullscreen_observations: Default::default(),
1030 action_dispatch_observations: Default::default(),
1031 presenters_and_platform_windows: Default::default(),
1032 foreground,
1033 pending_effects: VecDeque::new(),
1034 pending_focus_index: None,
1035 pending_notifications: Default::default(),
1036 pending_global_notifications: Default::default(),
1037 pending_flushes: 0,
1038 flushing_effects: false,
1039 halt_action_dispatch: false,
1040 }
1041 }
1042
1043 pub fn upgrade(&self) -> App {
1044 App(self.weak_self.as_ref().unwrap().upgrade().unwrap())
1045 }
1046
1047 pub fn quit(&mut self) {
1048 let mut futures = Vec::new();
1049 for model_id in self.cx.models.keys().copied().collect::<Vec<_>>() {
1050 let mut model = self.cx.models.remove(&model_id).unwrap();
1051 futures.extend(model.app_will_quit(self));
1052 self.cx.models.insert(model_id, model);
1053 }
1054
1055 for view_id in self.cx.views.keys().copied().collect::<Vec<_>>() {
1056 let mut view = self.cx.views.remove(&view_id).unwrap();
1057 futures.extend(view.app_will_quit(self));
1058 self.cx.views.insert(view_id, view);
1059 }
1060
1061 self.remove_all_windows();
1062
1063 let futures = futures::future::join_all(futures);
1064 if self
1065 .background
1066 .block_with_timeout(Duration::from_millis(100), futures)
1067 .is_err()
1068 {
1069 log::error!("timed out waiting on app_will_quit");
1070 }
1071 }
1072
1073 pub fn remove_all_windows(&mut self) {
1074 for (window_id, _) in self.cx.windows.drain() {
1075 self.presenters_and_platform_windows.remove(&window_id);
1076 }
1077 self.flush_effects();
1078 }
1079
1080 pub fn platform(&self) -> Arc<dyn platform::Platform> {
1081 self.cx.platform.clone()
1082 }
1083
1084 pub fn font_cache(&self) -> &Arc<FontCache> {
1085 &self.cx.font_cache
1086 }
1087
1088 pub fn foreground(&self) -> &Rc<executor::Foreground> {
1089 &self.foreground
1090 }
1091
1092 pub fn background(&self) -> &Arc<executor::Background> {
1093 &self.cx.background
1094 }
1095
1096 pub fn debug_elements(&self, window_id: usize) -> Option<crate::json::Value> {
1097 self.presenters_and_platform_windows
1098 .get(&window_id)
1099 .and_then(|(presenter, _)| presenter.borrow().debug_elements(self))
1100 }
1101
1102 pub fn deserialize_action(
1103 &self,
1104 name: &str,
1105 argument: Option<&str>,
1106 ) -> Result<Box<dyn Action>> {
1107 let callback = self
1108 .action_deserializers
1109 .get(name)
1110 .ok_or_else(|| anyhow!("unknown action {}", name))?
1111 .1;
1112 callback(argument.unwrap_or("{}"))
1113 .with_context(|| format!("invalid data for action {}", name))
1114 }
1115
1116 pub fn add_action<A, V, F>(&mut self, handler: F)
1117 where
1118 A: Action,
1119 V: View,
1120 F: 'static + FnMut(&mut V, &A, &mut ViewContext<V>),
1121 {
1122 self.add_action_internal(handler, false)
1123 }
1124
1125 pub fn capture_action<A, V, F>(&mut self, handler: F)
1126 where
1127 A: Action,
1128 V: View,
1129 F: 'static + FnMut(&mut V, &A, &mut ViewContext<V>),
1130 {
1131 self.add_action_internal(handler, true)
1132 }
1133
1134 fn add_action_internal<A, V, F>(&mut self, mut handler: F, capture: bool)
1135 where
1136 A: Action,
1137 V: View,
1138 F: 'static + FnMut(&mut V, &A, &mut ViewContext<V>),
1139 {
1140 let handler = Box::new(
1141 move |view: &mut dyn AnyView,
1142 action: &dyn Action,
1143 cx: &mut MutableAppContext,
1144 window_id: usize,
1145 view_id: usize| {
1146 let action = action.as_any().downcast_ref().unwrap();
1147 let mut cx = ViewContext::new(cx, window_id, view_id);
1148 handler(
1149 view.as_any_mut()
1150 .downcast_mut()
1151 .expect("downcast is type safe"),
1152 action,
1153 &mut cx,
1154 );
1155 },
1156 );
1157
1158 self.action_deserializers
1159 .entry(A::qualified_name())
1160 .or_insert((TypeId::of::<A>(), A::from_json_str));
1161
1162 let actions = if capture {
1163 &mut self.capture_actions
1164 } else {
1165 &mut self.actions
1166 };
1167
1168 actions
1169 .entry(TypeId::of::<V>())
1170 .or_default()
1171 .entry(TypeId::of::<A>())
1172 .or_default()
1173 .push(handler);
1174 }
1175
1176 pub fn add_async_action<A, V, F>(&mut self, mut handler: F)
1177 where
1178 A: Action,
1179 V: View,
1180 F: 'static + FnMut(&mut V, &A, &mut ViewContext<V>) -> Option<Task<Result<()>>>,
1181 {
1182 self.add_action(move |view, action, cx| {
1183 if let Some(task) = handler(view, action, cx) {
1184 task.detach_and_log_err(cx);
1185 }
1186 })
1187 }
1188
1189 pub fn add_global_action<A, F>(&mut self, mut handler: F)
1190 where
1191 A: Action,
1192 F: 'static + FnMut(&A, &mut MutableAppContext),
1193 {
1194 let handler = Box::new(move |action: &dyn Action, cx: &mut MutableAppContext| {
1195 let action = action.as_any().downcast_ref().unwrap();
1196 handler(action, cx);
1197 });
1198
1199 self.action_deserializers
1200 .entry(A::qualified_name())
1201 .or_insert((TypeId::of::<A>(), A::from_json_str));
1202
1203 if self
1204 .global_actions
1205 .insert(TypeId::of::<A>(), handler)
1206 .is_some()
1207 {
1208 panic!(
1209 "registered multiple global handlers for {}",
1210 type_name::<A>()
1211 );
1212 }
1213 }
1214
1215 pub fn window_ids(&self) -> impl Iterator<Item = usize> + '_ {
1216 self.cx.windows.keys().cloned()
1217 }
1218
1219 pub fn activate_window(&self, window_id: usize) {
1220 if let Some((_, window)) = self.presenters_and_platform_windows.get(&window_id) {
1221 window.activate()
1222 }
1223 }
1224
1225 pub fn root_view<T: View>(&self, window_id: usize) -> Option<ViewHandle<T>> {
1226 self.cx
1227 .windows
1228 .get(&window_id)
1229 .and_then(|window| window.root_view.clone().downcast::<T>())
1230 }
1231
1232 pub fn window_is_active(&self, window_id: usize) -> bool {
1233 self.cx
1234 .windows
1235 .get(&window_id)
1236 .map_or(false, |window| window.is_active)
1237 }
1238
1239 pub fn window_is_fullscreen(&self, window_id: usize) -> bool {
1240 self.cx
1241 .windows
1242 .get(&window_id)
1243 .map_or(false, |window| window.is_fullscreen)
1244 }
1245
1246 pub fn render_view(&mut self, params: RenderParams) -> Result<ElementBox> {
1247 let window_id = params.window_id;
1248 let view_id = params.view_id;
1249 let mut view = self
1250 .cx
1251 .views
1252 .remove(&(window_id, view_id))
1253 .ok_or_else(|| anyhow!("view not found"))?;
1254 let element = view.render(params, self);
1255 self.cx.views.insert((window_id, view_id), view);
1256 Ok(element)
1257 }
1258
1259 pub fn render_views(
1260 &mut self,
1261 window_id: usize,
1262 titlebar_height: f32,
1263 ) -> HashMap<usize, ElementBox> {
1264 self.start_frame();
1265 #[allow(clippy::needless_collect)]
1266 let view_ids = self
1267 .views
1268 .keys()
1269 .filter_map(|(win_id, view_id)| {
1270 if *win_id == window_id {
1271 Some(*view_id)
1272 } else {
1273 None
1274 }
1275 })
1276 .collect::<Vec<_>>();
1277
1278 view_ids
1279 .into_iter()
1280 .map(|view_id| {
1281 (
1282 view_id,
1283 self.render_view(RenderParams {
1284 window_id,
1285 view_id,
1286 titlebar_height,
1287 hovered_region_ids: Default::default(),
1288 clicked_region_ids: None,
1289 refreshing: false,
1290 })
1291 .unwrap(),
1292 )
1293 })
1294 .collect()
1295 }
1296
1297 pub(crate) fn start_frame(&mut self) {
1298 self.frame_count += 1;
1299 }
1300
1301 pub fn update<T, F: FnOnce(&mut Self) -> T>(&mut self, callback: F) -> T {
1302 self.pending_flushes += 1;
1303 let result = callback(self);
1304 self.flush_effects();
1305 result
1306 }
1307
1308 pub fn set_menus(&mut self, menus: Vec<Menu>) {
1309 self.foreground_platform
1310 .set_menus(menus, &self.keystroke_matcher);
1311 }
1312
1313 fn show_character_palette(&self, window_id: usize) {
1314 let (_, window) = &self.presenters_and_platform_windows[&window_id];
1315 window.show_character_palette();
1316 }
1317
1318 pub fn minimize_window(&self, window_id: usize) {
1319 let (_, window) = &self.presenters_and_platform_windows[&window_id];
1320 window.minimize();
1321 }
1322
1323 pub fn zoom_window(&self, window_id: usize) {
1324 let (_, window) = &self.presenters_and_platform_windows[&window_id];
1325 window.zoom();
1326 }
1327
1328 pub fn toggle_window_full_screen(&self, window_id: usize) {
1329 let (_, window) = &self.presenters_and_platform_windows[&window_id];
1330 window.toggle_full_screen();
1331 }
1332
1333 fn prompt(
1334 &self,
1335 window_id: usize,
1336 level: PromptLevel,
1337 msg: &str,
1338 answers: &[&str],
1339 ) -> oneshot::Receiver<usize> {
1340 let (_, window) = &self.presenters_and_platform_windows[&window_id];
1341 window.prompt(level, msg, answers)
1342 }
1343
1344 pub fn prompt_for_paths(
1345 &self,
1346 options: PathPromptOptions,
1347 ) -> oneshot::Receiver<Option<Vec<PathBuf>>> {
1348 self.foreground_platform.prompt_for_paths(options)
1349 }
1350
1351 pub fn prompt_for_new_path(&self, directory: &Path) -> oneshot::Receiver<Option<PathBuf>> {
1352 self.foreground_platform.prompt_for_new_path(directory)
1353 }
1354
1355 pub fn emit_global<E: Any>(&mut self, payload: E) {
1356 self.pending_effects.push_back(Effect::GlobalEvent {
1357 payload: Box::new(payload),
1358 });
1359 }
1360
1361 pub fn subscribe<E, H, F>(&mut self, handle: &H, mut callback: F) -> Subscription
1362 where
1363 E: Entity,
1364 E::Event: 'static,
1365 H: Handle<E>,
1366 F: 'static + FnMut(H, &E::Event, &mut Self),
1367 {
1368 self.subscribe_internal(handle, move |handle, event, cx| {
1369 callback(handle, event, cx);
1370 true
1371 })
1372 }
1373
1374 pub fn subscribe_global<E, F>(&mut self, mut callback: F) -> Subscription
1375 where
1376 E: Any,
1377 F: 'static + FnMut(&E, &mut Self),
1378 {
1379 let subscription_id = post_inc(&mut self.next_subscription_id);
1380 let type_id = TypeId::of::<E>();
1381 self.pending_effects.push_back(Effect::GlobalSubscription {
1382 type_id,
1383 subscription_id,
1384 callback: Box::new(move |payload, cx| {
1385 let payload = payload.downcast_ref().expect("downcast is type safe");
1386 callback(payload, cx)
1387 }),
1388 });
1389
1390 Subscription::GlobalSubscription {
1391 id: subscription_id,
1392 type_id,
1393 subscriptions: Some(self.global_subscriptions.downgrade()),
1394 }
1395 }
1396
1397 pub fn observe<E, H, F>(&mut self, handle: &H, mut callback: F) -> Subscription
1398 where
1399 E: Entity,
1400 E::Event: 'static,
1401 H: Handle<E>,
1402 F: 'static + FnMut(H, &mut Self),
1403 {
1404 self.observe_internal(handle, move |handle, cx| {
1405 callback(handle, cx);
1406 true
1407 })
1408 }
1409
1410 pub fn subscribe_internal<E, H, F>(&mut self, handle: &H, mut callback: F) -> Subscription
1411 where
1412 E: Entity,
1413 E::Event: 'static,
1414 H: Handle<E>,
1415 F: 'static + FnMut(H, &E::Event, &mut Self) -> bool,
1416 {
1417 let subscription_id = post_inc(&mut self.next_subscription_id);
1418 let emitter = handle.downgrade();
1419 self.pending_effects.push_back(Effect::Subscription {
1420 entity_id: handle.id(),
1421 subscription_id,
1422 callback: Box::new(move |payload, cx| {
1423 if let Some(emitter) = H::upgrade_from(&emitter, cx.as_ref()) {
1424 let payload = payload.downcast_ref().expect("downcast is type safe");
1425 callback(emitter, payload, cx)
1426 } else {
1427 false
1428 }
1429 }),
1430 });
1431 Subscription::Subscription {
1432 id: subscription_id,
1433 entity_id: handle.id(),
1434 subscriptions: Some(self.subscriptions.downgrade()),
1435 }
1436 }
1437
1438 fn observe_internal<E, H, F>(&mut self, handle: &H, mut callback: F) -> Subscription
1439 where
1440 E: Entity,
1441 E::Event: 'static,
1442 H: Handle<E>,
1443 F: 'static + FnMut(H, &mut Self) -> bool,
1444 {
1445 let subscription_id = post_inc(&mut self.next_subscription_id);
1446 let observed = handle.downgrade();
1447 let entity_id = handle.id();
1448 self.pending_effects.push_back(Effect::Observation {
1449 entity_id,
1450 subscription_id,
1451 callback: Box::new(move |cx| {
1452 if let Some(observed) = H::upgrade_from(&observed, cx) {
1453 callback(observed, cx)
1454 } else {
1455 false
1456 }
1457 }),
1458 });
1459 Subscription::Observation {
1460 id: subscription_id,
1461 entity_id,
1462 observations: Some(self.observations.downgrade()),
1463 }
1464 }
1465
1466 fn observe_focus<F, V>(&mut self, handle: &ViewHandle<V>, mut callback: F) -> Subscription
1467 where
1468 F: 'static + FnMut(ViewHandle<V>, bool, &mut MutableAppContext) -> bool,
1469 V: View,
1470 {
1471 let subscription_id = post_inc(&mut self.next_subscription_id);
1472 let observed = handle.downgrade();
1473 let view_id = handle.id();
1474
1475 self.pending_effects.push_back(Effect::FocusObservation {
1476 view_id,
1477 subscription_id,
1478 callback: Box::new(move |focused, cx| {
1479 if let Some(observed) = observed.upgrade(cx) {
1480 callback(observed, focused, cx)
1481 } else {
1482 false
1483 }
1484 }),
1485 });
1486
1487 Subscription::FocusObservation {
1488 id: subscription_id,
1489 view_id,
1490 observations: Some(self.focus_observations.downgrade()),
1491 }
1492 }
1493
1494 pub fn observe_global<G, F>(&mut self, mut observe: F) -> Subscription
1495 where
1496 G: Any,
1497 F: 'static + FnMut(&mut MutableAppContext),
1498 {
1499 let type_id = TypeId::of::<G>();
1500 let id = post_inc(&mut self.next_subscription_id);
1501
1502 self.global_observations.add_callback(
1503 type_id,
1504 id,
1505 Box::new(move |cx: &mut MutableAppContext| observe(cx)),
1506 );
1507
1508 Subscription::GlobalObservation {
1509 id,
1510 type_id,
1511 observations: Some(self.global_observations.downgrade()),
1512 }
1513 }
1514
1515 pub fn observe_release<E, H, F>(&mut self, handle: &H, callback: F) -> Subscription
1516 where
1517 E: Entity,
1518 E::Event: 'static,
1519 H: Handle<E>,
1520 F: 'static + FnOnce(&E, &mut Self),
1521 {
1522 let id = post_inc(&mut self.next_subscription_id);
1523 self.release_observations
1524 .lock()
1525 .entry(handle.id())
1526 .or_default()
1527 .insert(
1528 id,
1529 Box::new(move |released, cx| {
1530 let released = released.downcast_ref().unwrap();
1531 callback(released, cx)
1532 }),
1533 );
1534 Subscription::ReleaseObservation {
1535 id,
1536 entity_id: handle.id(),
1537 observations: Some(Arc::downgrade(&self.release_observations)),
1538 }
1539 }
1540
1541 pub fn observe_actions<F>(&mut self, callback: F) -> Subscription
1542 where
1543 F: 'static + FnMut(TypeId, &mut MutableAppContext),
1544 {
1545 let id = post_inc(&mut self.next_subscription_id);
1546 self.action_dispatch_observations
1547 .lock()
1548 .insert(id, Box::new(callback));
1549 Subscription::ActionObservation {
1550 id,
1551 observations: Some(Arc::downgrade(&self.action_dispatch_observations)),
1552 }
1553 }
1554
1555 fn observe_window_activation<F>(&mut self, window_id: usize, callback: F) -> Subscription
1556 where
1557 F: 'static + FnMut(bool, &mut MutableAppContext) -> bool,
1558 {
1559 let subscription_id = post_inc(&mut self.next_subscription_id);
1560 self.pending_effects
1561 .push_back(Effect::WindowActivationObservation {
1562 window_id,
1563 subscription_id,
1564 callback: Box::new(callback),
1565 });
1566 Subscription::WindowActivationObservation {
1567 id: subscription_id,
1568 window_id,
1569 observations: Some(self.window_activation_observations.downgrade()),
1570 }
1571 }
1572
1573 fn observe_fullscreen<F>(&mut self, window_id: usize, callback: F) -> Subscription
1574 where
1575 F: 'static + FnMut(bool, &mut MutableAppContext) -> bool,
1576 {
1577 let subscription_id = post_inc(&mut self.next_subscription_id);
1578 self.pending_effects
1579 .push_back(Effect::WindowFullscreenObservation {
1580 window_id,
1581 subscription_id,
1582 callback: Box::new(callback),
1583 });
1584 Subscription::WindowFullscreenObservation {
1585 id: subscription_id,
1586 window_id,
1587 observations: Some(self.window_activation_observations.downgrade()),
1588 }
1589 }
1590
1591 pub fn defer(&mut self, callback: impl 'static + FnOnce(&mut MutableAppContext)) {
1592 self.pending_effects.push_back(Effect::Deferred {
1593 callback: Box::new(callback),
1594 after_window_update: false,
1595 })
1596 }
1597
1598 pub fn after_window_update(&mut self, callback: impl 'static + FnOnce(&mut MutableAppContext)) {
1599 self.pending_effects.push_back(Effect::Deferred {
1600 callback: Box::new(callback),
1601 after_window_update: true,
1602 })
1603 }
1604
1605 pub(crate) fn notify_model(&mut self, model_id: usize) {
1606 if self.pending_notifications.insert(model_id) {
1607 self.pending_effects
1608 .push_back(Effect::ModelNotification { model_id });
1609 }
1610 }
1611
1612 pub(crate) fn notify_view(&mut self, window_id: usize, view_id: usize) {
1613 if self.pending_notifications.insert(view_id) {
1614 self.pending_effects
1615 .push_back(Effect::ViewNotification { window_id, view_id });
1616 }
1617 }
1618
1619 pub(crate) fn notify_global(&mut self, type_id: TypeId) {
1620 if self.pending_global_notifications.insert(type_id) {
1621 self.pending_effects
1622 .push_back(Effect::GlobalNotification { type_id });
1623 }
1624 }
1625
1626 pub(crate) fn name_for_view(&self, window_id: usize, view_id: usize) -> Option<&str> {
1627 self.views
1628 .get(&(window_id, view_id))
1629 .map(|view| view.ui_name())
1630 }
1631
1632 pub fn all_action_names<'a>(&'a self) -> impl Iterator<Item = &'static str> + 'a {
1633 self.action_deserializers.keys().copied()
1634 }
1635
1636 pub fn available_actions(
1637 &self,
1638 window_id: usize,
1639 view_id: usize,
1640 ) -> impl Iterator<Item = (&'static str, Box<dyn Action>, SmallVec<[&Binding; 1]>)> {
1641 let mut action_types: HashSet<_> = self.global_actions.keys().copied().collect();
1642
1643 for view_id in self.parents(window_id, view_id) {
1644 if let Some(view) = self.views.get(&(window_id, view_id)) {
1645 let view_type = view.as_any().type_id();
1646 if let Some(actions) = self.actions.get(&view_type) {
1647 action_types.extend(actions.keys().copied());
1648 }
1649 }
1650 }
1651
1652 self.action_deserializers
1653 .iter()
1654 .filter_map(move |(name, (type_id, deserialize))| {
1655 if action_types.contains(type_id) {
1656 Some((
1657 *name,
1658 deserialize("{}").ok()?,
1659 self.keystroke_matcher
1660 .bindings_for_action_type(*type_id)
1661 .collect(),
1662 ))
1663 } else {
1664 None
1665 }
1666 })
1667 }
1668
1669 pub fn is_action_available(&self, action: &dyn Action) -> bool {
1670 let action_type = action.as_any().type_id();
1671 if let Some(window_id) = self.cx.platform.key_window_id() {
1672 if let Some(focused_view_id) = self.focused_view_id(window_id) {
1673 for view_id in self.parents(window_id, focused_view_id) {
1674 if let Some(view) = self.views.get(&(window_id, view_id)) {
1675 let view_type = view.as_any().type_id();
1676 if let Some(actions) = self.actions.get(&view_type) {
1677 if actions.contains_key(&action_type) {
1678 return true;
1679 }
1680 }
1681 }
1682 }
1683 }
1684 }
1685 self.global_actions.contains_key(&action_type)
1686 }
1687
1688 /// Return keystrokes that would dispatch the given action closest to the focused view, if there are any.
1689 pub(crate) fn keystrokes_for_action(
1690 &self,
1691 window_id: usize,
1692 dispatch_path: &[usize],
1693 action: &dyn Action,
1694 ) -> Option<SmallVec<[Keystroke; 2]>> {
1695 for view_id in dispatch_path.iter().rev() {
1696 let view = self
1697 .cx
1698 .views
1699 .get(&(window_id, *view_id))
1700 .expect("view in responder chain does not exist");
1701 let cx = view.keymap_context(self.as_ref());
1702 let keystrokes = self.keystroke_matcher.keystrokes_for_action(action, &cx);
1703 if keystrokes.is_some() {
1704 return keystrokes;
1705 }
1706 }
1707
1708 None
1709 }
1710
1711 // Traverses the parent tree. Walks down the tree toward the passed
1712 // view calling visit with true. Then walks back up the tree calling visit with false.
1713 // If `visit` returns false this function will immediately return.
1714 // Returns a bool indicating if the traversal was completed early.
1715 fn visit_dispatch_path(
1716 &mut self,
1717 window_id: usize,
1718 view_id: usize,
1719 mut visit: impl FnMut(usize, bool, &mut MutableAppContext) -> bool,
1720 ) -> bool {
1721 // List of view ids from the leaf to the root of the window
1722 let path = self.parents(window_id, view_id).collect::<Vec<_>>();
1723
1724 // Walk down from the root to the leaf calling visit with capture_phase = true
1725 for view_id in path.iter().rev() {
1726 if !visit(*view_id, true, self) {
1727 return false;
1728 }
1729 }
1730
1731 // Walk up from the leaf to the root calling visit with capture_phase = false
1732 for view_id in path.iter() {
1733 if !visit(*view_id, false, self) {
1734 return false;
1735 }
1736 }
1737
1738 true
1739 }
1740
1741 // Returns an iterator over all of the view ids from the passed view up to the root of the window
1742 // Includes the passed view itself
1743 fn parents(&self, window_id: usize, mut view_id: usize) -> impl Iterator<Item = usize> + '_ {
1744 std::iter::once(view_id)
1745 .into_iter()
1746 .chain(std::iter::from_fn(move || {
1747 if let Some(ParentId::View(parent_id)) = self.parents.get(&(window_id, view_id)) {
1748 view_id = *parent_id;
1749 Some(view_id)
1750 } else {
1751 None
1752 }
1753 }))
1754 }
1755
1756 fn actions_mut(
1757 &mut self,
1758 capture_phase: bool,
1759 ) -> &mut HashMap<TypeId, HashMap<TypeId, Vec<Box<ActionCallback>>>> {
1760 if capture_phase {
1761 &mut self.capture_actions
1762 } else {
1763 &mut self.actions
1764 }
1765 }
1766
1767 pub fn dispatch_global_action<A: Action>(&mut self, action: A) {
1768 self.dispatch_global_action_any(&action);
1769 }
1770
1771 fn dispatch_global_action_any(&mut self, action: &dyn Action) -> bool {
1772 self.update(|this| {
1773 if let Some((name, mut handler)) = this.global_actions.remove_entry(&action.id()) {
1774 handler(action, this);
1775 this.global_actions.insert(name, handler);
1776 true
1777 } else {
1778 false
1779 }
1780 })
1781 }
1782
1783 pub fn add_bindings<T: IntoIterator<Item = keymap::Binding>>(&mut self, bindings: T) {
1784 self.keystroke_matcher.add_bindings(bindings);
1785 }
1786
1787 pub fn clear_bindings(&mut self) {
1788 self.keystroke_matcher.clear_bindings();
1789 }
1790
1791 pub fn dispatch_keystroke(&mut self, window_id: usize, keystroke: &Keystroke) -> bool {
1792 let mut pending = false;
1793
1794 if let Some(focused_view_id) = self.focused_view_id(window_id) {
1795 for view_id in self.parents(window_id, focused_view_id).collect::<Vec<_>>() {
1796 let keymap_context = self
1797 .cx
1798 .views
1799 .get(&(window_id, view_id))
1800 .unwrap()
1801 .keymap_context(self.as_ref());
1802
1803 match self.keystroke_matcher.push_keystroke(
1804 keystroke.clone(),
1805 view_id,
1806 &keymap_context,
1807 ) {
1808 MatchResult::None => {}
1809 MatchResult::Pending => pending = true,
1810 MatchResult::Action(action) => {
1811 if self.handle_dispatch_action_from_effect(
1812 window_id,
1813 Some(view_id),
1814 action.as_ref(),
1815 ) {
1816 self.keystroke_matcher.clear_pending();
1817 return true;
1818 }
1819 }
1820 }
1821 }
1822 }
1823
1824 pending
1825 }
1826
1827 pub fn default_global<T: 'static + Default>(&mut self) -> &T {
1828 let type_id = TypeId::of::<T>();
1829 self.update(|this| {
1830 if let Entry::Vacant(entry) = this.cx.globals.entry(type_id) {
1831 entry.insert(Box::new(T::default()));
1832 this.notify_global(type_id);
1833 }
1834 });
1835 self.globals.get(&type_id).unwrap().downcast_ref().unwrap()
1836 }
1837
1838 pub fn set_global<T: 'static>(&mut self, state: T) {
1839 self.update(|this| {
1840 let type_id = TypeId::of::<T>();
1841 this.cx.globals.insert(type_id, Box::new(state));
1842 this.notify_global(type_id);
1843 });
1844 }
1845
1846 pub fn update_default_global<T, F, U>(&mut self, update: F) -> U
1847 where
1848 T: 'static + Default,
1849 F: FnOnce(&mut T, &mut MutableAppContext) -> U,
1850 {
1851 self.update(|this| {
1852 let type_id = TypeId::of::<T>();
1853 let mut state = this
1854 .cx
1855 .globals
1856 .remove(&type_id)
1857 .unwrap_or_else(|| Box::new(T::default()));
1858 let result = update(state.downcast_mut().unwrap(), this);
1859 this.cx.globals.insert(type_id, state);
1860 this.notify_global(type_id);
1861 result
1862 })
1863 }
1864
1865 pub fn update_global<T, F, U>(&mut self, update: F) -> U
1866 where
1867 T: 'static,
1868 F: FnOnce(&mut T, &mut MutableAppContext) -> U,
1869 {
1870 self.update(|this| {
1871 let type_id = TypeId::of::<T>();
1872 if let Some(mut state) = this.cx.globals.remove(&type_id) {
1873 let result = update(state.downcast_mut().unwrap(), this);
1874 this.cx.globals.insert(type_id, state);
1875 this.notify_global(type_id);
1876 result
1877 } else {
1878 panic!("No global added for {}", std::any::type_name::<T>());
1879 }
1880 })
1881 }
1882
1883 pub fn add_model<T, F>(&mut self, build_model: F) -> ModelHandle<T>
1884 where
1885 T: Entity,
1886 F: FnOnce(&mut ModelContext<T>) -> T,
1887 {
1888 self.update(|this| {
1889 let model_id = post_inc(&mut this.next_entity_id);
1890 let handle = ModelHandle::new(model_id, &this.cx.ref_counts);
1891 let mut cx = ModelContext::new(this, model_id);
1892 let model = build_model(&mut cx);
1893 this.cx.models.insert(model_id, Box::new(model));
1894 handle
1895 })
1896 }
1897
1898 pub fn add_window<T, F>(
1899 &mut self,
1900 window_options: WindowOptions,
1901 build_root_view: F,
1902 ) -> (usize, ViewHandle<T>)
1903 where
1904 T: View,
1905 F: FnOnce(&mut ViewContext<T>) -> T,
1906 {
1907 self.update(|this| {
1908 let window_id = post_inc(&mut this.next_window_id);
1909 let root_view = this
1910 .build_and_insert_view(window_id, ParentId::Root, |cx| Some(build_root_view(cx)))
1911 .unwrap();
1912 this.cx.windows.insert(
1913 window_id,
1914 Window {
1915 root_view: root_view.clone().into(),
1916 focused_view_id: Some(root_view.id()),
1917 is_active: false,
1918 invalidation: None,
1919 is_fullscreen: false,
1920 },
1921 );
1922 root_view.update(this, |view, cx| view.on_focus_in(cx.handle().into(), cx));
1923 this.open_platform_window(window_id, window_options);
1924
1925 (window_id, root_view)
1926 })
1927 }
1928
1929 pub fn replace_root_view<T, F>(&mut self, window_id: usize, build_root_view: F) -> ViewHandle<T>
1930 where
1931 T: View,
1932 F: FnOnce(&mut ViewContext<T>) -> T,
1933 {
1934 self.update(|this| {
1935 let root_view = this
1936 .build_and_insert_view(window_id, ParentId::Root, |cx| Some(build_root_view(cx)))
1937 .unwrap();
1938 let window = this.cx.windows.get_mut(&window_id).unwrap();
1939 window.root_view = root_view.clone().into();
1940 window.focused_view_id = Some(root_view.id());
1941 root_view
1942 })
1943 }
1944
1945 pub fn remove_window(&mut self, window_id: usize) {
1946 self.cx.windows.remove(&window_id);
1947 self.presenters_and_platform_windows.remove(&window_id);
1948 self.flush_effects();
1949 }
1950
1951 fn open_platform_window(&mut self, window_id: usize, window_options: WindowOptions) {
1952 let mut window =
1953 self.cx
1954 .platform
1955 .open_window(window_id, window_options, self.foreground.clone());
1956 let presenter = Rc::new(RefCell::new(
1957 self.build_presenter(window_id, window.titlebar_height()),
1958 ));
1959
1960 {
1961 let mut app = self.upgrade();
1962 let presenter = Rc::downgrade(&presenter);
1963 window.on_event(Box::new(move |event| {
1964 app.update(|cx| {
1965 if let Some(presenter) = presenter.upgrade() {
1966 if let Event::KeyDown(KeyDownEvent { keystroke, .. }) = &event {
1967 if cx.dispatch_keystroke(window_id, keystroke) {
1968 return true;
1969 }
1970 }
1971
1972 presenter.borrow_mut().dispatch_event(event, false, cx)
1973 } else {
1974 false
1975 }
1976 })
1977 }));
1978 }
1979
1980 {
1981 let mut app = self.upgrade();
1982 window.on_active_status_change(Box::new(move |is_active| {
1983 app.update(|cx| cx.window_changed_active_status(window_id, is_active))
1984 }));
1985 }
1986
1987 {
1988 let mut app = self.upgrade();
1989 window.on_resize(Box::new(move || {
1990 app.update(|cx| cx.window_was_resized(window_id))
1991 }));
1992 }
1993
1994 {
1995 let mut app = self.upgrade();
1996 window.on_fullscreen(Box::new(move |is_fullscreen| {
1997 app.update(|cx| cx.window_was_fullscreen_changed(window_id, is_fullscreen))
1998 }));
1999 }
2000
2001 {
2002 let mut app = self.upgrade();
2003 window.on_close(Box::new(move || {
2004 app.update(|cx| cx.remove_window(window_id));
2005 }));
2006 }
2007
2008 window.set_input_handler(Box::new(WindowInputHandler {
2009 app: self.upgrade().0,
2010 window_id,
2011 }));
2012
2013 let scene =
2014 presenter
2015 .borrow_mut()
2016 .build_scene(window.size(), window.scale_factor(), false, self);
2017 window.present_scene(scene);
2018 self.presenters_and_platform_windows
2019 .insert(window_id, (presenter.clone(), window));
2020 }
2021
2022 pub fn build_presenter(&mut self, window_id: usize, titlebar_height: f32) -> Presenter {
2023 Presenter::new(
2024 window_id,
2025 titlebar_height,
2026 self.cx.font_cache.clone(),
2027 TextLayoutCache::new(self.cx.platform.fonts()),
2028 self.assets.clone(),
2029 self,
2030 )
2031 }
2032
2033 pub fn add_view<T, F>(
2034 &mut self,
2035 parent_handle: impl Into<AnyViewHandle>,
2036 build_view: F,
2037 ) -> ViewHandle<T>
2038 where
2039 T: View,
2040 F: FnOnce(&mut ViewContext<T>) -> T,
2041 {
2042 let parent_handle = parent_handle.into();
2043 self.build_and_insert_view(
2044 parent_handle.window_id,
2045 ParentId::View(parent_handle.view_id),
2046 |cx| Some(build_view(cx)),
2047 )
2048 .unwrap()
2049 }
2050
2051 pub fn add_option_view<T, F>(
2052 &mut self,
2053 parent_handle: impl Into<AnyViewHandle>,
2054 build_view: F,
2055 ) -> Option<ViewHandle<T>>
2056 where
2057 T: View,
2058 F: FnOnce(&mut ViewContext<T>) -> Option<T>,
2059 {
2060 let parent_handle = parent_handle.into();
2061 self.build_and_insert_view(
2062 parent_handle.window_id,
2063 ParentId::View(parent_handle.view_id),
2064 build_view,
2065 )
2066 }
2067
2068 pub(crate) fn build_and_insert_view<T, F>(
2069 &mut self,
2070 window_id: usize,
2071 parent_id: ParentId,
2072 build_view: F,
2073 ) -> Option<ViewHandle<T>>
2074 where
2075 T: View,
2076 F: FnOnce(&mut ViewContext<T>) -> Option<T>,
2077 {
2078 self.update(|this| {
2079 let view_id = post_inc(&mut this.next_entity_id);
2080 let mut cx = ViewContext::new(this, window_id, view_id);
2081 let handle = if let Some(view) = build_view(&mut cx) {
2082 this.cx.views.insert((window_id, view_id), Box::new(view));
2083 this.cx.parents.insert((window_id, view_id), parent_id);
2084 if let Some(window) = this.cx.windows.get_mut(&window_id) {
2085 window
2086 .invalidation
2087 .get_or_insert_with(Default::default)
2088 .updated
2089 .insert(view_id);
2090 }
2091 Some(ViewHandle::new(window_id, view_id, &this.cx.ref_counts))
2092 } else {
2093 None
2094 };
2095 handle
2096 })
2097 }
2098
2099 fn remove_dropped_entities(&mut self) {
2100 loop {
2101 let (dropped_models, dropped_views, dropped_element_states) =
2102 self.cx.ref_counts.lock().take_dropped();
2103 if dropped_models.is_empty()
2104 && dropped_views.is_empty()
2105 && dropped_element_states.is_empty()
2106 {
2107 break;
2108 }
2109
2110 for model_id in dropped_models {
2111 self.subscriptions.remove(model_id);
2112 self.observations.remove(model_id);
2113 let mut model = self.cx.models.remove(&model_id).unwrap();
2114 model.release(self);
2115 self.pending_effects
2116 .push_back(Effect::ModelRelease { model_id, model });
2117 }
2118
2119 for (window_id, view_id) in dropped_views {
2120 self.subscriptions.remove(view_id);
2121 self.observations.remove(view_id);
2122 let mut view = self.cx.views.remove(&(window_id, view_id)).unwrap();
2123 view.release(self);
2124 let change_focus_to = self.cx.windows.get_mut(&window_id).and_then(|window| {
2125 window
2126 .invalidation
2127 .get_or_insert_with(Default::default)
2128 .removed
2129 .push(view_id);
2130 if window.focused_view_id == Some(view_id) {
2131 Some(window.root_view.id())
2132 } else {
2133 None
2134 }
2135 });
2136 self.cx.parents.remove(&(window_id, view_id));
2137
2138 if let Some(view_id) = change_focus_to {
2139 self.handle_focus_effect(window_id, Some(view_id));
2140 }
2141
2142 self.pending_effects
2143 .push_back(Effect::ViewRelease { view_id, view });
2144 }
2145
2146 for key in dropped_element_states {
2147 self.cx.element_states.remove(&key);
2148 }
2149 }
2150 }
2151
2152 fn flush_effects(&mut self) {
2153 self.pending_flushes = self.pending_flushes.saturating_sub(1);
2154 let mut after_window_update_callbacks = Vec::new();
2155
2156 if !self.flushing_effects && self.pending_flushes == 0 {
2157 self.flushing_effects = true;
2158
2159 let mut refreshing = false;
2160 loop {
2161 if let Some(effect) = self.pending_effects.pop_front() {
2162 if let Some(pending_focus_index) = self.pending_focus_index.as_mut() {
2163 *pending_focus_index = pending_focus_index.saturating_sub(1);
2164 }
2165 match effect {
2166 Effect::Subscription {
2167 entity_id,
2168 subscription_id,
2169 callback,
2170 } => self.subscriptions.add_or_remove_callback(
2171 entity_id,
2172 subscription_id,
2173 callback,
2174 ),
2175
2176 Effect::Event { entity_id, payload } => {
2177 let mut subscriptions = self.subscriptions.clone();
2178 subscriptions.emit_and_cleanup(entity_id, self, |callback, this| {
2179 callback(payload.as_ref(), this)
2180 })
2181 }
2182
2183 Effect::GlobalSubscription {
2184 type_id,
2185 subscription_id,
2186 callback,
2187 } => self.global_subscriptions.add_or_remove_callback(
2188 type_id,
2189 subscription_id,
2190 callback,
2191 ),
2192
2193 Effect::GlobalEvent { payload } => self.emit_global_event(payload),
2194
2195 Effect::Observation {
2196 entity_id,
2197 subscription_id,
2198 callback,
2199 } => self.observations.add_or_remove_callback(
2200 entity_id,
2201 subscription_id,
2202 callback,
2203 ),
2204
2205 Effect::ModelNotification { model_id } => {
2206 let mut observations = self.observations.clone();
2207 observations
2208 .emit_and_cleanup(model_id, self, |callback, this| callback(this));
2209 }
2210
2211 Effect::ViewNotification { window_id, view_id } => {
2212 self.handle_view_notification_effect(window_id, view_id)
2213 }
2214
2215 Effect::GlobalNotification { type_id } => {
2216 let mut subscriptions = self.global_observations.clone();
2217 subscriptions.emit_and_cleanup(type_id, self, |callback, this| {
2218 callback(this);
2219 true
2220 });
2221 }
2222
2223 Effect::Deferred {
2224 callback,
2225 after_window_update,
2226 } => {
2227 if after_window_update {
2228 after_window_update_callbacks.push(callback);
2229 } else {
2230 callback(self)
2231 }
2232 }
2233
2234 Effect::ModelRelease { model_id, model } => {
2235 self.handle_entity_release_effect(model_id, model.as_any())
2236 }
2237
2238 Effect::ViewRelease { view_id, view } => {
2239 self.handle_entity_release_effect(view_id, view.as_any())
2240 }
2241
2242 Effect::Focus { window_id, view_id } => {
2243 self.handle_focus_effect(window_id, view_id);
2244 }
2245
2246 Effect::FocusObservation {
2247 view_id,
2248 subscription_id,
2249 callback,
2250 } => {
2251 self.focus_observations.add_or_remove_callback(
2252 view_id,
2253 subscription_id,
2254 callback,
2255 );
2256 }
2257
2258 Effect::ResizeWindow { window_id } => {
2259 if let Some(window) = self.cx.windows.get_mut(&window_id) {
2260 window
2261 .invalidation
2262 .get_or_insert(WindowInvalidation::default());
2263 }
2264 }
2265
2266 Effect::WindowActivationObservation {
2267 window_id,
2268 subscription_id,
2269 callback,
2270 } => self.window_activation_observations.add_or_remove_callback(
2271 window_id,
2272 subscription_id,
2273 callback,
2274 ),
2275
2276 Effect::ActivateWindow {
2277 window_id,
2278 is_active,
2279 } => self.handle_window_activation_effect(window_id, is_active),
2280
2281 Effect::WindowFullscreenObservation {
2282 window_id,
2283 subscription_id,
2284 callback,
2285 } => self.window_fullscreen_observations.add_or_remove_callback(
2286 window_id,
2287 subscription_id,
2288 callback,
2289 ),
2290
2291 Effect::FullscreenWindow {
2292 window_id,
2293 is_fullscreen,
2294 } => self.handle_fullscreen_effect(window_id, is_fullscreen),
2295
2296 Effect::RefreshWindows => {
2297 refreshing = true;
2298 }
2299 Effect::DispatchActionFrom {
2300 window_id,
2301 view_id,
2302 action,
2303 } => {
2304 self.handle_dispatch_action_from_effect(
2305 window_id,
2306 Some(view_id),
2307 action.as_ref(),
2308 );
2309 }
2310 Effect::ActionDispatchNotification { action_id } => {
2311 self.handle_action_dispatch_notification_effect(action_id)
2312 }
2313 Effect::WindowShouldCloseSubscription {
2314 window_id,
2315 callback,
2316 } => {
2317 self.handle_window_should_close_subscription_effect(window_id, callback)
2318 }
2319 }
2320 self.pending_notifications.clear();
2321 self.remove_dropped_entities();
2322 } else {
2323 self.remove_dropped_entities();
2324 if refreshing {
2325 self.perform_window_refresh();
2326 } else {
2327 self.update_windows();
2328 }
2329
2330 if self.pending_effects.is_empty() {
2331 for callback in after_window_update_callbacks.drain(..) {
2332 callback(self);
2333 }
2334
2335 if self.pending_effects.is_empty() {
2336 self.flushing_effects = false;
2337 self.pending_notifications.clear();
2338 self.pending_global_notifications.clear();
2339 break;
2340 }
2341 }
2342
2343 refreshing = false;
2344 }
2345 }
2346 }
2347 }
2348
2349 fn update_windows(&mut self) {
2350 let mut invalidations: HashMap<_, _> = Default::default();
2351 for (window_id, window) in &mut self.cx.windows {
2352 if let Some(invalidation) = window.invalidation.take() {
2353 invalidations.insert(*window_id, invalidation);
2354 }
2355 }
2356
2357 for (window_id, mut invalidation) in invalidations {
2358 if let Some((presenter, mut window)) =
2359 self.presenters_and_platform_windows.remove(&window_id)
2360 {
2361 {
2362 let mut presenter = presenter.borrow_mut();
2363 presenter.invalidate(&mut invalidation, self);
2364 let scene =
2365 presenter.build_scene(window.size(), window.scale_factor(), false, self);
2366 window.present_scene(scene);
2367 }
2368 self.presenters_and_platform_windows
2369 .insert(window_id, (presenter, window));
2370 }
2371 }
2372 }
2373
2374 fn window_was_resized(&mut self, window_id: usize) {
2375 self.pending_effects
2376 .push_back(Effect::ResizeWindow { window_id });
2377 }
2378
2379 fn window_was_fullscreen_changed(&mut self, window_id: usize, is_fullscreen: bool) {
2380 self.pending_effects.push_back(Effect::FullscreenWindow {
2381 window_id,
2382 is_fullscreen,
2383 });
2384 }
2385
2386 fn window_changed_active_status(&mut self, window_id: usize, is_active: bool) {
2387 self.pending_effects.push_back(Effect::ActivateWindow {
2388 window_id,
2389 is_active,
2390 });
2391 }
2392
2393 pub fn refresh_windows(&mut self) {
2394 self.pending_effects.push_back(Effect::RefreshWindows);
2395 }
2396
2397 pub fn dispatch_action_at(&mut self, window_id: usize, view_id: usize, action: impl Action) {
2398 self.dispatch_any_action_at(window_id, view_id, Box::new(action));
2399 }
2400
2401 pub fn dispatch_any_action_at(
2402 &mut self,
2403 window_id: usize,
2404 view_id: usize,
2405 action: Box<dyn Action>,
2406 ) {
2407 self.pending_effects.push_back(Effect::DispatchActionFrom {
2408 window_id,
2409 view_id,
2410 action,
2411 });
2412 }
2413
2414 fn perform_window_refresh(&mut self) {
2415 let mut presenters = mem::take(&mut self.presenters_and_platform_windows);
2416 for (window_id, (presenter, window)) in &mut presenters {
2417 let mut invalidation = self
2418 .cx
2419 .windows
2420 .get_mut(window_id)
2421 .unwrap()
2422 .invalidation
2423 .take();
2424 let mut presenter = presenter.borrow_mut();
2425 presenter.refresh(
2426 invalidation.as_mut().unwrap_or(&mut Default::default()),
2427 self,
2428 );
2429 let scene = presenter.build_scene(window.size(), window.scale_factor(), true, self);
2430 window.present_scene(scene);
2431 }
2432 self.presenters_and_platform_windows = presenters;
2433 }
2434
2435 fn emit_global_event(&mut self, payload: Box<dyn Any>) {
2436 let type_id = (&*payload).type_id();
2437
2438 let mut subscriptions = self.global_subscriptions.clone();
2439 subscriptions.emit_and_cleanup(type_id, self, |callback, this| {
2440 callback(payload.as_ref(), this);
2441 true //Always alive
2442 });
2443 }
2444
2445 fn handle_view_notification_effect(
2446 &mut self,
2447 observed_window_id: usize,
2448 observed_view_id: usize,
2449 ) {
2450 if self
2451 .cx
2452 .views
2453 .contains_key(&(observed_window_id, observed_view_id))
2454 {
2455 if let Some(window) = self.cx.windows.get_mut(&observed_window_id) {
2456 window
2457 .invalidation
2458 .get_or_insert_with(Default::default)
2459 .updated
2460 .insert(observed_view_id);
2461 }
2462
2463 let mut observations = self.observations.clone();
2464 observations.emit_and_cleanup(observed_view_id, self, |callback, this| callback(this));
2465 }
2466 }
2467
2468 fn handle_entity_release_effect(&mut self, entity_id: usize, entity: &dyn Any) {
2469 let callbacks = self.release_observations.lock().remove(&entity_id);
2470 if let Some(callbacks) = callbacks {
2471 for (_, callback) in callbacks {
2472 callback(entity, self);
2473 }
2474 }
2475 }
2476
2477 fn handle_fullscreen_effect(&mut self, window_id: usize, is_fullscreen: bool) {
2478 //Short circuit evaluation if we're already g2g
2479 if self
2480 .cx
2481 .windows
2482 .get(&window_id)
2483 .map(|w| w.is_fullscreen == is_fullscreen)
2484 .unwrap_or(false)
2485 {
2486 return;
2487 }
2488
2489 self.update(|this| {
2490 let window = this.cx.windows.get_mut(&window_id)?;
2491 window.is_fullscreen = is_fullscreen;
2492
2493 let mut observations = this.window_fullscreen_observations.clone();
2494 observations.emit_and_cleanup(window_id, this, |callback, this| {
2495 callback(is_fullscreen, this)
2496 });
2497
2498 Some(())
2499 });
2500 }
2501
2502 fn handle_window_activation_effect(&mut self, window_id: usize, active: bool) {
2503 //Short circuit evaluation if we're already g2g
2504 if self
2505 .cx
2506 .windows
2507 .get(&window_id)
2508 .map(|w| w.is_active == active)
2509 .unwrap_or(false)
2510 {
2511 return;
2512 }
2513
2514 self.update(|this| {
2515 let window = this.cx.windows.get_mut(&window_id)?;
2516 window.is_active = active;
2517
2518 //Handle focus
2519 let focused_id = window.focused_view_id?;
2520 for view_id in this.parents(window_id, focused_id).collect::<Vec<_>>() {
2521 if let Some(mut view) = this.cx.views.remove(&(window_id, view_id)) {
2522 if active {
2523 view.on_focus_in(this, window_id, view_id, focused_id);
2524 } else {
2525 view.on_focus_out(this, window_id, view_id, focused_id);
2526 }
2527 this.cx.views.insert((window_id, view_id), view);
2528 }
2529 }
2530
2531 let mut observations = this.window_activation_observations.clone();
2532 observations.emit_and_cleanup(window_id, this, |callback, this| callback(active, this));
2533
2534 Some(())
2535 });
2536 }
2537
2538 fn handle_focus_effect(&mut self, window_id: usize, focused_id: Option<usize>) {
2539 self.pending_focus_index.take();
2540
2541 if self
2542 .cx
2543 .windows
2544 .get(&window_id)
2545 .map(|w| w.focused_view_id)
2546 .map_or(false, |cur_focused| cur_focused == focused_id)
2547 {
2548 return;
2549 }
2550
2551 self.update(|this| {
2552 let blurred_id = this.cx.windows.get_mut(&window_id).and_then(|window| {
2553 let blurred_id = window.focused_view_id;
2554 window.focused_view_id = focused_id;
2555 blurred_id
2556 });
2557
2558 let blurred_parents = blurred_id
2559 .map(|blurred_id| this.parents(window_id, blurred_id).collect::<Vec<_>>())
2560 .unwrap_or_default();
2561 let focused_parents = focused_id
2562 .map(|focused_id| this.parents(window_id, focused_id).collect::<Vec<_>>())
2563 .unwrap_or_default();
2564
2565 if let Some(blurred_id) = blurred_id {
2566 for view_id in blurred_parents.iter().copied() {
2567 if let Some(mut view) = this.cx.views.remove(&(window_id, view_id)) {
2568 view.on_focus_out(this, window_id, view_id, blurred_id);
2569 this.cx.views.insert((window_id, view_id), view);
2570 }
2571 }
2572
2573 let mut subscriptions = this.focus_observations.clone();
2574 subscriptions
2575 .emit_and_cleanup(blurred_id, this, |callback, this| callback(false, this));
2576 }
2577
2578 if let Some(focused_id) = focused_id {
2579 for view_id in focused_parents {
2580 if let Some(mut view) = this.cx.views.remove(&(window_id, view_id)) {
2581 view.on_focus_in(this, window_id, view_id, focused_id);
2582 this.cx.views.insert((window_id, view_id), view);
2583 }
2584 }
2585
2586 let mut subscriptions = this.focus_observations.clone();
2587 subscriptions
2588 .emit_and_cleanup(focused_id, this, |callback, this| callback(true, this));
2589 }
2590 })
2591 }
2592
2593 fn handle_dispatch_action_from_effect(
2594 &mut self,
2595 window_id: usize,
2596 view_id: Option<usize>,
2597 action: &dyn Action,
2598 ) -> bool {
2599 self.update(|this| {
2600 if let Some(view_id) = view_id {
2601 this.halt_action_dispatch = false;
2602 this.visit_dispatch_path(window_id, view_id, |view_id, capture_phase, this| {
2603 if let Some(mut view) = this.cx.views.remove(&(window_id, view_id)) {
2604 let type_id = view.as_any().type_id();
2605
2606 if let Some((name, mut handlers)) = this
2607 .actions_mut(capture_phase)
2608 .get_mut(&type_id)
2609 .and_then(|h| h.remove_entry(&action.id()))
2610 {
2611 for handler in handlers.iter_mut().rev() {
2612 this.halt_action_dispatch = true;
2613 handler(view.as_mut(), action, this, window_id, view_id);
2614 if this.halt_action_dispatch {
2615 break;
2616 }
2617 }
2618 this.actions_mut(capture_phase)
2619 .get_mut(&type_id)
2620 .unwrap()
2621 .insert(name, handlers);
2622 }
2623
2624 this.cx.views.insert((window_id, view_id), view);
2625 }
2626
2627 !this.halt_action_dispatch
2628 });
2629 }
2630
2631 if !this.halt_action_dispatch {
2632 this.halt_action_dispatch = this.dispatch_global_action_any(action);
2633 }
2634
2635 this.pending_effects
2636 .push_back(Effect::ActionDispatchNotification {
2637 action_id: action.id(),
2638 });
2639 this.halt_action_dispatch
2640 })
2641 }
2642
2643 fn handle_action_dispatch_notification_effect(&mut self, action_id: TypeId) {
2644 let mut callbacks = mem::take(&mut *self.action_dispatch_observations.lock());
2645 for callback in callbacks.values_mut() {
2646 callback(action_id, self);
2647 }
2648 self.action_dispatch_observations.lock().extend(callbacks);
2649 }
2650
2651 fn handle_window_should_close_subscription_effect(
2652 &mut self,
2653 window_id: usize,
2654 mut callback: WindowShouldCloseSubscriptionCallback,
2655 ) {
2656 let mut app = self.upgrade();
2657 if let Some((_, window)) = self.presenters_and_platform_windows.get_mut(&window_id) {
2658 window.on_should_close(Box::new(move || app.update(|cx| callback(cx))))
2659 }
2660 }
2661
2662 pub fn focus(&mut self, window_id: usize, view_id: Option<usize>) {
2663 if let Some(pending_focus_index) = self.pending_focus_index {
2664 self.pending_effects.remove(pending_focus_index);
2665 }
2666 self.pending_focus_index = Some(self.pending_effects.len());
2667 self.pending_effects
2668 .push_back(Effect::Focus { window_id, view_id });
2669 }
2670
2671 pub fn spawn<F, Fut, T>(&self, f: F) -> Task<T>
2672 where
2673 F: FnOnce(AsyncAppContext) -> Fut,
2674 Fut: 'static + Future<Output = T>,
2675 T: 'static,
2676 {
2677 let future = f(self.to_async());
2678 let cx = self.to_async();
2679 self.foreground.spawn(async move {
2680 let result = future.await;
2681 cx.0.borrow_mut().flush_effects();
2682 result
2683 })
2684 }
2685
2686 pub fn to_async(&self) -> AsyncAppContext {
2687 AsyncAppContext(self.weak_self.as_ref().unwrap().upgrade().unwrap())
2688 }
2689
2690 pub fn write_to_clipboard(&self, item: ClipboardItem) {
2691 self.cx.platform.write_to_clipboard(item);
2692 }
2693
2694 pub fn read_from_clipboard(&self) -> Option<ClipboardItem> {
2695 self.cx.platform.read_from_clipboard()
2696 }
2697
2698 #[cfg(any(test, feature = "test-support"))]
2699 pub fn leak_detector(&self) -> Arc<Mutex<LeakDetector>> {
2700 self.cx.ref_counts.lock().leak_detector.clone()
2701 }
2702}
2703
2704impl ReadModel for MutableAppContext {
2705 fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T {
2706 if let Some(model) = self.cx.models.get(&handle.model_id) {
2707 model
2708 .as_any()
2709 .downcast_ref()
2710 .expect("downcast is type safe")
2711 } else {
2712 panic!("circular model reference");
2713 }
2714 }
2715}
2716
2717impl UpdateModel for MutableAppContext {
2718 fn update_model<T: Entity, V>(
2719 &mut self,
2720 handle: &ModelHandle<T>,
2721 update: &mut dyn FnMut(&mut T, &mut ModelContext<T>) -> V,
2722 ) -> V {
2723 if let Some(mut model) = self.cx.models.remove(&handle.model_id) {
2724 self.update(|this| {
2725 let mut cx = ModelContext::new(this, handle.model_id);
2726 let result = update(
2727 model
2728 .as_any_mut()
2729 .downcast_mut()
2730 .expect("downcast is type safe"),
2731 &mut cx,
2732 );
2733 this.cx.models.insert(handle.model_id, model);
2734 result
2735 })
2736 } else {
2737 panic!("circular model update");
2738 }
2739 }
2740}
2741
2742impl UpgradeModelHandle for MutableAppContext {
2743 fn upgrade_model_handle<T: Entity>(
2744 &self,
2745 handle: &WeakModelHandle<T>,
2746 ) -> Option<ModelHandle<T>> {
2747 self.cx.upgrade_model_handle(handle)
2748 }
2749
2750 fn model_handle_is_upgradable<T: Entity>(&self, handle: &WeakModelHandle<T>) -> bool {
2751 self.cx.model_handle_is_upgradable(handle)
2752 }
2753
2754 fn upgrade_any_model_handle(&self, handle: &AnyWeakModelHandle) -> Option<AnyModelHandle> {
2755 self.cx.upgrade_any_model_handle(handle)
2756 }
2757}
2758
2759impl UpgradeViewHandle for MutableAppContext {
2760 fn upgrade_view_handle<T: View>(&self, handle: &WeakViewHandle<T>) -> Option<ViewHandle<T>> {
2761 self.cx.upgrade_view_handle(handle)
2762 }
2763
2764 fn upgrade_any_view_handle(&self, handle: &AnyWeakViewHandle) -> Option<AnyViewHandle> {
2765 self.cx.upgrade_any_view_handle(handle)
2766 }
2767}
2768
2769impl ReadView for MutableAppContext {
2770 fn read_view<T: View>(&self, handle: &ViewHandle<T>) -> &T {
2771 if let Some(view) = self.cx.views.get(&(handle.window_id, handle.view_id)) {
2772 view.as_any().downcast_ref().expect("downcast is type safe")
2773 } else {
2774 panic!("circular view reference for type {}", type_name::<T>());
2775 }
2776 }
2777}
2778
2779impl UpdateView for MutableAppContext {
2780 fn update_view<T, S>(
2781 &mut self,
2782 handle: &ViewHandle<T>,
2783 update: &mut dyn FnMut(&mut T, &mut ViewContext<T>) -> S,
2784 ) -> S
2785 where
2786 T: View,
2787 {
2788 self.update(|this| {
2789 let mut view = this
2790 .cx
2791 .views
2792 .remove(&(handle.window_id, handle.view_id))
2793 .expect("circular view update");
2794
2795 let mut cx = ViewContext::new(this, handle.window_id, handle.view_id);
2796 let result = update(
2797 view.as_any_mut()
2798 .downcast_mut()
2799 .expect("downcast is type safe"),
2800 &mut cx,
2801 );
2802 this.cx
2803 .views
2804 .insert((handle.window_id, handle.view_id), view);
2805 result
2806 })
2807 }
2808}
2809
2810impl AsRef<AppContext> for MutableAppContext {
2811 fn as_ref(&self) -> &AppContext {
2812 &self.cx
2813 }
2814}
2815
2816impl Deref for MutableAppContext {
2817 type Target = AppContext;
2818
2819 fn deref(&self) -> &Self::Target {
2820 &self.cx
2821 }
2822}
2823
2824#[derive(Debug)]
2825pub enum ParentId {
2826 View(usize),
2827 Root,
2828}
2829
2830pub struct AppContext {
2831 models: HashMap<usize, Box<dyn AnyModel>>,
2832 views: HashMap<(usize, usize), Box<dyn AnyView>>,
2833 pub(crate) parents: HashMap<(usize, usize), ParentId>,
2834 windows: HashMap<usize, Window>,
2835 globals: HashMap<TypeId, Box<dyn Any>>,
2836 element_states: HashMap<ElementStateId, Box<dyn Any>>,
2837 background: Arc<executor::Background>,
2838 ref_counts: Arc<Mutex<RefCounts>>,
2839 font_cache: Arc<FontCache>,
2840 platform: Arc<dyn Platform>,
2841}
2842
2843impl AppContext {
2844 pub(crate) fn root_view(&self, window_id: usize) -> Option<AnyViewHandle> {
2845 self.windows
2846 .get(&window_id)
2847 .map(|window| window.root_view.clone())
2848 }
2849
2850 pub fn root_view_id(&self, window_id: usize) -> Option<usize> {
2851 self.windows
2852 .get(&window_id)
2853 .map(|window| window.root_view.id())
2854 }
2855
2856 pub fn focused_view_id(&self, window_id: usize) -> Option<usize> {
2857 self.windows
2858 .get(&window_id)
2859 .and_then(|window| window.focused_view_id)
2860 }
2861
2862 pub fn background(&self) -> &Arc<executor::Background> {
2863 &self.background
2864 }
2865
2866 pub fn font_cache(&self) -> &Arc<FontCache> {
2867 &self.font_cache
2868 }
2869
2870 pub fn platform(&self) -> &Arc<dyn Platform> {
2871 &self.platform
2872 }
2873
2874 pub fn has_global<T: 'static>(&self) -> bool {
2875 self.globals.contains_key(&TypeId::of::<T>())
2876 }
2877
2878 pub fn global<T: 'static>(&self) -> &T {
2879 if let Some(global) = self.globals.get(&TypeId::of::<T>()) {
2880 global.downcast_ref().unwrap()
2881 } else {
2882 panic!("no global has been added for {}", type_name::<T>());
2883 }
2884 }
2885}
2886
2887impl ReadModel for AppContext {
2888 fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T {
2889 if let Some(model) = self.models.get(&handle.model_id) {
2890 model
2891 .as_any()
2892 .downcast_ref()
2893 .expect("downcast should be type safe")
2894 } else {
2895 panic!("circular model reference");
2896 }
2897 }
2898}
2899
2900impl UpgradeModelHandle for AppContext {
2901 fn upgrade_model_handle<T: Entity>(
2902 &self,
2903 handle: &WeakModelHandle<T>,
2904 ) -> Option<ModelHandle<T>> {
2905 if self.models.contains_key(&handle.model_id) {
2906 Some(ModelHandle::new(handle.model_id, &self.ref_counts))
2907 } else {
2908 None
2909 }
2910 }
2911
2912 fn model_handle_is_upgradable<T: Entity>(&self, handle: &WeakModelHandle<T>) -> bool {
2913 self.models.contains_key(&handle.model_id)
2914 }
2915
2916 fn upgrade_any_model_handle(&self, handle: &AnyWeakModelHandle) -> Option<AnyModelHandle> {
2917 if self.models.contains_key(&handle.model_id) {
2918 Some(AnyModelHandle::new(
2919 handle.model_id,
2920 handle.model_type,
2921 self.ref_counts.clone(),
2922 ))
2923 } else {
2924 None
2925 }
2926 }
2927}
2928
2929impl UpgradeViewHandle for AppContext {
2930 fn upgrade_view_handle<T: View>(&self, handle: &WeakViewHandle<T>) -> Option<ViewHandle<T>> {
2931 if self.ref_counts.lock().is_entity_alive(handle.view_id) {
2932 Some(ViewHandle::new(
2933 handle.window_id,
2934 handle.view_id,
2935 &self.ref_counts,
2936 ))
2937 } else {
2938 None
2939 }
2940 }
2941
2942 fn upgrade_any_view_handle(&self, handle: &AnyWeakViewHandle) -> Option<AnyViewHandle> {
2943 if self.ref_counts.lock().is_entity_alive(handle.view_id) {
2944 Some(AnyViewHandle::new(
2945 handle.window_id,
2946 handle.view_id,
2947 handle.view_type,
2948 self.ref_counts.clone(),
2949 ))
2950 } else {
2951 None
2952 }
2953 }
2954}
2955
2956impl ReadView for AppContext {
2957 fn read_view<T: View>(&self, handle: &ViewHandle<T>) -> &T {
2958 if let Some(view) = self.views.get(&(handle.window_id, handle.view_id)) {
2959 view.as_any()
2960 .downcast_ref()
2961 .expect("downcast should be type safe")
2962 } else {
2963 panic!("circular view reference");
2964 }
2965 }
2966}
2967
2968struct Window {
2969 root_view: AnyViewHandle,
2970 focused_view_id: Option<usize>,
2971 is_active: bool,
2972 is_fullscreen: bool,
2973 invalidation: Option<WindowInvalidation>,
2974}
2975
2976#[derive(Default, Clone)]
2977pub struct WindowInvalidation {
2978 pub updated: HashSet<usize>,
2979 pub removed: Vec<usize>,
2980}
2981
2982pub enum Effect {
2983 Subscription {
2984 entity_id: usize,
2985 subscription_id: usize,
2986 callback: SubscriptionCallback,
2987 },
2988 Event {
2989 entity_id: usize,
2990 payload: Box<dyn Any>,
2991 },
2992 GlobalSubscription {
2993 type_id: TypeId,
2994 subscription_id: usize,
2995 callback: GlobalSubscriptionCallback,
2996 },
2997 GlobalEvent {
2998 payload: Box<dyn Any>,
2999 },
3000 Observation {
3001 entity_id: usize,
3002 subscription_id: usize,
3003 callback: ObservationCallback,
3004 },
3005 ModelNotification {
3006 model_id: usize,
3007 },
3008 ViewNotification {
3009 window_id: usize,
3010 view_id: usize,
3011 },
3012 Deferred {
3013 callback: Box<dyn FnOnce(&mut MutableAppContext)>,
3014 after_window_update: bool,
3015 },
3016 GlobalNotification {
3017 type_id: TypeId,
3018 },
3019 ModelRelease {
3020 model_id: usize,
3021 model: Box<dyn AnyModel>,
3022 },
3023 ViewRelease {
3024 view_id: usize,
3025 view: Box<dyn AnyView>,
3026 },
3027 Focus {
3028 window_id: usize,
3029 view_id: Option<usize>,
3030 },
3031 FocusObservation {
3032 view_id: usize,
3033 subscription_id: usize,
3034 callback: FocusObservationCallback,
3035 },
3036 ResizeWindow {
3037 window_id: usize,
3038 },
3039 FullscreenWindow {
3040 window_id: usize,
3041 is_fullscreen: bool,
3042 },
3043 ActivateWindow {
3044 window_id: usize,
3045 is_active: bool,
3046 },
3047 WindowActivationObservation {
3048 window_id: usize,
3049 subscription_id: usize,
3050 callback: WindowActivationCallback,
3051 },
3052 WindowFullscreenObservation {
3053 window_id: usize,
3054 subscription_id: usize,
3055 callback: WindowFullscreenCallback,
3056 },
3057 RefreshWindows,
3058 DispatchActionFrom {
3059 window_id: usize,
3060 view_id: usize,
3061 action: Box<dyn Action>,
3062 },
3063 ActionDispatchNotification {
3064 action_id: TypeId,
3065 },
3066 WindowShouldCloseSubscription {
3067 window_id: usize,
3068 callback: WindowShouldCloseSubscriptionCallback,
3069 },
3070}
3071
3072impl Debug for Effect {
3073 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
3074 match self {
3075 Effect::Subscription {
3076 entity_id,
3077 subscription_id,
3078 ..
3079 } => f
3080 .debug_struct("Effect::Subscribe")
3081 .field("entity_id", entity_id)
3082 .field("subscription_id", subscription_id)
3083 .finish(),
3084 Effect::Event { entity_id, .. } => f
3085 .debug_struct("Effect::Event")
3086 .field("entity_id", entity_id)
3087 .finish(),
3088 Effect::GlobalSubscription {
3089 type_id,
3090 subscription_id,
3091 ..
3092 } => f
3093 .debug_struct("Effect::Subscribe")
3094 .field("type_id", type_id)
3095 .field("subscription_id", subscription_id)
3096 .finish(),
3097 Effect::GlobalEvent { payload, .. } => f
3098 .debug_struct("Effect::GlobalEvent")
3099 .field("type_id", &(&*payload).type_id())
3100 .finish(),
3101 Effect::Observation {
3102 entity_id,
3103 subscription_id,
3104 ..
3105 } => f
3106 .debug_struct("Effect::Observation")
3107 .field("entity_id", entity_id)
3108 .field("subscription_id", subscription_id)
3109 .finish(),
3110 Effect::ModelNotification { model_id } => f
3111 .debug_struct("Effect::ModelNotification")
3112 .field("model_id", model_id)
3113 .finish(),
3114 Effect::ViewNotification { window_id, view_id } => f
3115 .debug_struct("Effect::ViewNotification")
3116 .field("window_id", window_id)
3117 .field("view_id", view_id)
3118 .finish(),
3119 Effect::GlobalNotification { type_id } => f
3120 .debug_struct("Effect::GlobalNotification")
3121 .field("type_id", type_id)
3122 .finish(),
3123 Effect::Deferred { .. } => f.debug_struct("Effect::Deferred").finish(),
3124 Effect::ModelRelease { model_id, .. } => f
3125 .debug_struct("Effect::ModelRelease")
3126 .field("model_id", model_id)
3127 .finish(),
3128 Effect::ViewRelease { view_id, .. } => f
3129 .debug_struct("Effect::ViewRelease")
3130 .field("view_id", view_id)
3131 .finish(),
3132 Effect::Focus { window_id, view_id } => f
3133 .debug_struct("Effect::Focus")
3134 .field("window_id", window_id)
3135 .field("view_id", view_id)
3136 .finish(),
3137 Effect::FocusObservation {
3138 view_id,
3139 subscription_id,
3140 ..
3141 } => f
3142 .debug_struct("Effect::FocusObservation")
3143 .field("view_id", view_id)
3144 .field("subscription_id", subscription_id)
3145 .finish(),
3146 Effect::DispatchActionFrom {
3147 window_id, view_id, ..
3148 } => f
3149 .debug_struct("Effect::DispatchActionFrom")
3150 .field("window_id", window_id)
3151 .field("view_id", view_id)
3152 .finish(),
3153 Effect::ActionDispatchNotification { action_id, .. } => f
3154 .debug_struct("Effect::ActionDispatchNotification")
3155 .field("action_id", action_id)
3156 .finish(),
3157 Effect::ResizeWindow { window_id } => f
3158 .debug_struct("Effect::RefreshWindow")
3159 .field("window_id", window_id)
3160 .finish(),
3161 Effect::WindowActivationObservation {
3162 window_id,
3163 subscription_id,
3164 ..
3165 } => f
3166 .debug_struct("Effect::WindowActivationObservation")
3167 .field("window_id", window_id)
3168 .field("subscription_id", subscription_id)
3169 .finish(),
3170 Effect::ActivateWindow {
3171 window_id,
3172 is_active,
3173 } => f
3174 .debug_struct("Effect::ActivateWindow")
3175 .field("window_id", window_id)
3176 .field("is_active", is_active)
3177 .finish(),
3178 Effect::FullscreenWindow {
3179 window_id,
3180 is_fullscreen,
3181 } => f
3182 .debug_struct("Effect::FullscreenWindow")
3183 .field("window_id", window_id)
3184 .field("is_fullscreen", is_fullscreen)
3185 .finish(),
3186 Effect::WindowFullscreenObservation {
3187 window_id,
3188 subscription_id,
3189 callback: _,
3190 } => f
3191 .debug_struct("Effect::WindowFullscreenObservation")
3192 .field("window_id", window_id)
3193 .field("subscription_id", subscription_id)
3194 .finish(),
3195 Effect::RefreshWindows => f.debug_struct("Effect::FullViewRefresh").finish(),
3196 Effect::WindowShouldCloseSubscription { window_id, .. } => f
3197 .debug_struct("Effect::WindowShouldCloseSubscription")
3198 .field("window_id", window_id)
3199 .finish(),
3200 }
3201 }
3202}
3203
3204pub trait AnyModel {
3205 fn as_any(&self) -> &dyn Any;
3206 fn as_any_mut(&mut self) -> &mut dyn Any;
3207 fn release(&mut self, cx: &mut MutableAppContext);
3208 fn app_will_quit(
3209 &mut self,
3210 cx: &mut MutableAppContext,
3211 ) -> Option<Pin<Box<dyn 'static + Future<Output = ()>>>>;
3212}
3213
3214impl<T> AnyModel for T
3215where
3216 T: Entity,
3217{
3218 fn as_any(&self) -> &dyn Any {
3219 self
3220 }
3221
3222 fn as_any_mut(&mut self) -> &mut dyn Any {
3223 self
3224 }
3225
3226 fn release(&mut self, cx: &mut MutableAppContext) {
3227 self.release(cx);
3228 }
3229
3230 fn app_will_quit(
3231 &mut self,
3232 cx: &mut MutableAppContext,
3233 ) -> Option<Pin<Box<dyn 'static + Future<Output = ()>>>> {
3234 self.app_will_quit(cx)
3235 }
3236}
3237
3238pub trait AnyView {
3239 fn as_any(&self) -> &dyn Any;
3240 fn as_any_mut(&mut self) -> &mut dyn Any;
3241 fn release(&mut self, cx: &mut MutableAppContext);
3242 fn app_will_quit(
3243 &mut self,
3244 cx: &mut MutableAppContext,
3245 ) -> Option<Pin<Box<dyn 'static + Future<Output = ()>>>>;
3246 fn ui_name(&self) -> &'static str;
3247 fn render(&mut self, params: RenderParams, cx: &mut MutableAppContext) -> ElementBox;
3248 fn on_focus_in(
3249 &mut self,
3250 cx: &mut MutableAppContext,
3251 window_id: usize,
3252 view_id: usize,
3253 focused_id: usize,
3254 );
3255 fn on_focus_out(
3256 &mut self,
3257 cx: &mut MutableAppContext,
3258 window_id: usize,
3259 view_id: usize,
3260 focused_id: usize,
3261 );
3262 fn keymap_context(&self, cx: &AppContext) -> keymap::Context;
3263 fn debug_json(&self, cx: &AppContext) -> serde_json::Value;
3264
3265 fn text_for_range(&self, range: Range<usize>, cx: &AppContext) -> Option<String>;
3266 fn selected_text_range(&self, cx: &AppContext) -> Option<Range<usize>>;
3267 fn marked_text_range(&self, cx: &AppContext) -> Option<Range<usize>>;
3268 fn unmark_text(&mut self, cx: &mut MutableAppContext, window_id: usize, view_id: usize);
3269 fn replace_text_in_range(
3270 &mut self,
3271 range: Option<Range<usize>>,
3272 text: &str,
3273 cx: &mut MutableAppContext,
3274 window_id: usize,
3275 view_id: usize,
3276 );
3277 fn replace_and_mark_text_in_range(
3278 &mut self,
3279 range: Option<Range<usize>>,
3280 new_text: &str,
3281 new_selected_range: Option<Range<usize>>,
3282 cx: &mut MutableAppContext,
3283 window_id: usize,
3284 view_id: usize,
3285 );
3286 fn any_handle(&self, window_id: usize, view_id: usize, cx: &AppContext) -> AnyViewHandle {
3287 AnyViewHandle::new(
3288 window_id,
3289 view_id,
3290 self.as_any().type_id(),
3291 cx.ref_counts.clone(),
3292 )
3293 }
3294}
3295
3296impl<T> AnyView for T
3297where
3298 T: View,
3299{
3300 fn as_any(&self) -> &dyn Any {
3301 self
3302 }
3303
3304 fn as_any_mut(&mut self) -> &mut dyn Any {
3305 self
3306 }
3307
3308 fn release(&mut self, cx: &mut MutableAppContext) {
3309 self.release(cx);
3310 }
3311
3312 fn app_will_quit(
3313 &mut self,
3314 cx: &mut MutableAppContext,
3315 ) -> Option<Pin<Box<dyn 'static + Future<Output = ()>>>> {
3316 self.app_will_quit(cx)
3317 }
3318
3319 fn ui_name(&self) -> &'static str {
3320 T::ui_name()
3321 }
3322
3323 fn render(&mut self, params: RenderParams, cx: &mut MutableAppContext) -> ElementBox {
3324 View::render(self, &mut RenderContext::new(params, cx))
3325 }
3326
3327 fn on_focus_in(
3328 &mut self,
3329 cx: &mut MutableAppContext,
3330 window_id: usize,
3331 view_id: usize,
3332 focused_id: usize,
3333 ) {
3334 let mut cx = ViewContext::new(cx, window_id, view_id);
3335 let focused_view_handle: AnyViewHandle = if view_id == focused_id {
3336 cx.handle().into()
3337 } else {
3338 let focused_type = cx
3339 .views
3340 .get(&(window_id, focused_id))
3341 .unwrap()
3342 .as_any()
3343 .type_id();
3344 AnyViewHandle::new(window_id, focused_id, focused_type, cx.ref_counts.clone())
3345 };
3346 View::on_focus_in(self, focused_view_handle, &mut cx);
3347 }
3348
3349 fn on_focus_out(
3350 &mut self,
3351 cx: &mut MutableAppContext,
3352 window_id: usize,
3353 view_id: usize,
3354 blurred_id: usize,
3355 ) {
3356 let mut cx = ViewContext::new(cx, window_id, view_id);
3357 let blurred_view_handle: AnyViewHandle = if view_id == blurred_id {
3358 cx.handle().into()
3359 } else {
3360 let blurred_type = cx
3361 .views
3362 .get(&(window_id, blurred_id))
3363 .unwrap()
3364 .as_any()
3365 .type_id();
3366 AnyViewHandle::new(window_id, blurred_id, blurred_type, cx.ref_counts.clone())
3367 };
3368 View::on_focus_out(self, blurred_view_handle, &mut cx);
3369 }
3370
3371 fn keymap_context(&self, cx: &AppContext) -> keymap::Context {
3372 View::keymap_context(self, cx)
3373 }
3374
3375 fn debug_json(&self, cx: &AppContext) -> serde_json::Value {
3376 View::debug_json(self, cx)
3377 }
3378
3379 fn text_for_range(&self, range: Range<usize>, cx: &AppContext) -> Option<String> {
3380 View::text_for_range(self, range, cx)
3381 }
3382
3383 fn selected_text_range(&self, cx: &AppContext) -> Option<Range<usize>> {
3384 View::selected_text_range(self, cx)
3385 }
3386
3387 fn marked_text_range(&self, cx: &AppContext) -> Option<Range<usize>> {
3388 View::marked_text_range(self, cx)
3389 }
3390
3391 fn unmark_text(&mut self, cx: &mut MutableAppContext, window_id: usize, view_id: usize) {
3392 let mut cx = ViewContext::new(cx, window_id, view_id);
3393 View::unmark_text(self, &mut cx)
3394 }
3395
3396 fn replace_text_in_range(
3397 &mut self,
3398 range: Option<Range<usize>>,
3399 text: &str,
3400 cx: &mut MutableAppContext,
3401 window_id: usize,
3402 view_id: usize,
3403 ) {
3404 let mut cx = ViewContext::new(cx, window_id, view_id);
3405 View::replace_text_in_range(self, range, text, &mut cx)
3406 }
3407
3408 fn replace_and_mark_text_in_range(
3409 &mut self,
3410 range: Option<Range<usize>>,
3411 new_text: &str,
3412 new_selected_range: Option<Range<usize>>,
3413 cx: &mut MutableAppContext,
3414 window_id: usize,
3415 view_id: usize,
3416 ) {
3417 let mut cx = ViewContext::new(cx, window_id, view_id);
3418 View::replace_and_mark_text_in_range(self, range, new_text, new_selected_range, &mut cx)
3419 }
3420}
3421
3422pub struct ModelContext<'a, T: ?Sized> {
3423 app: &'a mut MutableAppContext,
3424 model_id: usize,
3425 model_type: PhantomData<T>,
3426 halt_stream: bool,
3427}
3428
3429impl<'a, T: Entity> ModelContext<'a, T> {
3430 fn new(app: &'a mut MutableAppContext, model_id: usize) -> Self {
3431 Self {
3432 app,
3433 model_id,
3434 model_type: PhantomData,
3435 halt_stream: false,
3436 }
3437 }
3438
3439 pub fn background(&self) -> &Arc<executor::Background> {
3440 &self.app.cx.background
3441 }
3442
3443 pub fn halt_stream(&mut self) {
3444 self.halt_stream = true;
3445 }
3446
3447 pub fn model_id(&self) -> usize {
3448 self.model_id
3449 }
3450
3451 pub fn add_model<S, F>(&mut self, build_model: F) -> ModelHandle<S>
3452 where
3453 S: Entity,
3454 F: FnOnce(&mut ModelContext<S>) -> S,
3455 {
3456 self.app.add_model(build_model)
3457 }
3458
3459 pub fn defer(&mut self, callback: impl 'static + FnOnce(&mut T, &mut ModelContext<T>)) {
3460 let handle = self.handle();
3461 self.app.defer(move |cx| {
3462 handle.update(cx, |model, cx| {
3463 callback(model, cx);
3464 })
3465 })
3466 }
3467
3468 pub fn emit(&mut self, payload: T::Event) {
3469 self.app.pending_effects.push_back(Effect::Event {
3470 entity_id: self.model_id,
3471 payload: Box::new(payload),
3472 });
3473 }
3474
3475 pub fn notify(&mut self) {
3476 self.app.notify_model(self.model_id);
3477 }
3478
3479 pub fn subscribe<S: Entity, F>(
3480 &mut self,
3481 handle: &ModelHandle<S>,
3482 mut callback: F,
3483 ) -> Subscription
3484 where
3485 S::Event: 'static,
3486 F: 'static + FnMut(&mut T, ModelHandle<S>, &S::Event, &mut ModelContext<T>),
3487 {
3488 let subscriber = self.weak_handle();
3489 self.app
3490 .subscribe_internal(handle, move |emitter, event, cx| {
3491 if let Some(subscriber) = subscriber.upgrade(cx) {
3492 subscriber.update(cx, |subscriber, cx| {
3493 callback(subscriber, emitter, event, cx);
3494 });
3495 true
3496 } else {
3497 false
3498 }
3499 })
3500 }
3501
3502 pub fn observe<S, F>(&mut self, handle: &ModelHandle<S>, mut callback: F) -> Subscription
3503 where
3504 S: Entity,
3505 F: 'static + FnMut(&mut T, ModelHandle<S>, &mut ModelContext<T>),
3506 {
3507 let observer = self.weak_handle();
3508 self.app.observe_internal(handle, move |observed, cx| {
3509 if let Some(observer) = observer.upgrade(cx) {
3510 observer.update(cx, |observer, cx| {
3511 callback(observer, observed, cx);
3512 });
3513 true
3514 } else {
3515 false
3516 }
3517 })
3518 }
3519
3520 pub fn observe_global<G, F>(&mut self, mut callback: F) -> Subscription
3521 where
3522 G: Any,
3523 F: 'static + FnMut(&mut T, &mut ModelContext<T>),
3524 {
3525 let observer = self.weak_handle();
3526 self.app.observe_global::<G, _>(move |cx| {
3527 if let Some(observer) = observer.upgrade(cx) {
3528 observer.update(cx, |observer, cx| callback(observer, cx));
3529 }
3530 })
3531 }
3532
3533 pub fn observe_release<S, F>(
3534 &mut self,
3535 handle: &ModelHandle<S>,
3536 mut callback: F,
3537 ) -> Subscription
3538 where
3539 S: Entity,
3540 F: 'static + FnMut(&mut T, &S, &mut ModelContext<T>),
3541 {
3542 let observer = self.weak_handle();
3543 self.app.observe_release(handle, move |released, cx| {
3544 if let Some(observer) = observer.upgrade(cx) {
3545 observer.update(cx, |observer, cx| {
3546 callback(observer, released, cx);
3547 });
3548 }
3549 })
3550 }
3551
3552 pub fn handle(&self) -> ModelHandle<T> {
3553 ModelHandle::new(self.model_id, &self.app.cx.ref_counts)
3554 }
3555
3556 pub fn weak_handle(&self) -> WeakModelHandle<T> {
3557 WeakModelHandle::new(self.model_id)
3558 }
3559
3560 pub fn spawn<F, Fut, S>(&self, f: F) -> Task<S>
3561 where
3562 F: FnOnce(ModelHandle<T>, AsyncAppContext) -> Fut,
3563 Fut: 'static + Future<Output = S>,
3564 S: 'static,
3565 {
3566 let handle = self.handle();
3567 self.app.spawn(|cx| f(handle, cx))
3568 }
3569
3570 pub fn spawn_weak<F, Fut, S>(&self, f: F) -> Task<S>
3571 where
3572 F: FnOnce(WeakModelHandle<T>, AsyncAppContext) -> Fut,
3573 Fut: 'static + Future<Output = S>,
3574 S: 'static,
3575 {
3576 let handle = self.weak_handle();
3577 self.app.spawn(|cx| f(handle, cx))
3578 }
3579}
3580
3581impl<M> AsRef<AppContext> for ModelContext<'_, M> {
3582 fn as_ref(&self) -> &AppContext {
3583 &self.app.cx
3584 }
3585}
3586
3587impl<M> AsMut<MutableAppContext> for ModelContext<'_, M> {
3588 fn as_mut(&mut self) -> &mut MutableAppContext {
3589 self.app
3590 }
3591}
3592
3593impl<M> ReadModel for ModelContext<'_, M> {
3594 fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T {
3595 self.app.read_model(handle)
3596 }
3597}
3598
3599impl<M> UpdateModel for ModelContext<'_, M> {
3600 fn update_model<T: Entity, V>(
3601 &mut self,
3602 handle: &ModelHandle<T>,
3603 update: &mut dyn FnMut(&mut T, &mut ModelContext<T>) -> V,
3604 ) -> V {
3605 self.app.update_model(handle, update)
3606 }
3607}
3608
3609impl<M> UpgradeModelHandle for ModelContext<'_, M> {
3610 fn upgrade_model_handle<T: Entity>(
3611 &self,
3612 handle: &WeakModelHandle<T>,
3613 ) -> Option<ModelHandle<T>> {
3614 self.cx.upgrade_model_handle(handle)
3615 }
3616
3617 fn model_handle_is_upgradable<T: Entity>(&self, handle: &WeakModelHandle<T>) -> bool {
3618 self.cx.model_handle_is_upgradable(handle)
3619 }
3620
3621 fn upgrade_any_model_handle(&self, handle: &AnyWeakModelHandle) -> Option<AnyModelHandle> {
3622 self.cx.upgrade_any_model_handle(handle)
3623 }
3624}
3625
3626impl<M> Deref for ModelContext<'_, M> {
3627 type Target = MutableAppContext;
3628
3629 fn deref(&self) -> &Self::Target {
3630 self.app
3631 }
3632}
3633
3634impl<M> DerefMut for ModelContext<'_, M> {
3635 fn deref_mut(&mut self) -> &mut Self::Target {
3636 &mut self.app
3637 }
3638}
3639
3640pub struct ViewContext<'a, T: ?Sized> {
3641 app: &'a mut MutableAppContext,
3642 window_id: usize,
3643 view_id: usize,
3644 view_type: PhantomData<T>,
3645}
3646
3647impl<'a, T: View> ViewContext<'a, T> {
3648 fn new(app: &'a mut MutableAppContext, window_id: usize, view_id: usize) -> Self {
3649 Self {
3650 app,
3651 window_id,
3652 view_id,
3653 view_type: PhantomData,
3654 }
3655 }
3656
3657 pub fn handle(&self) -> ViewHandle<T> {
3658 ViewHandle::new(self.window_id, self.view_id, &self.app.cx.ref_counts)
3659 }
3660
3661 pub fn weak_handle(&self) -> WeakViewHandle<T> {
3662 WeakViewHandle::new(self.window_id, self.view_id)
3663 }
3664
3665 pub fn window_id(&self) -> usize {
3666 self.window_id
3667 }
3668
3669 pub fn view_id(&self) -> usize {
3670 self.view_id
3671 }
3672
3673 pub fn foreground(&self) -> &Rc<executor::Foreground> {
3674 self.app.foreground()
3675 }
3676
3677 pub fn background_executor(&self) -> &Arc<executor::Background> {
3678 &self.app.cx.background
3679 }
3680
3681 pub fn platform(&self) -> Arc<dyn Platform> {
3682 self.app.platform()
3683 }
3684
3685 pub fn show_character_palette(&self) {
3686 self.app.show_character_palette(self.window_id);
3687 }
3688
3689 pub fn minimize_window(&self) {
3690 self.app.minimize_window(self.window_id)
3691 }
3692
3693 pub fn zoom_window(&self) {
3694 self.app.zoom_window(self.window_id)
3695 }
3696
3697 pub fn toggle_full_screen(&self) {
3698 self.app.toggle_window_full_screen(self.window_id)
3699 }
3700
3701 pub fn prompt(
3702 &self,
3703 level: PromptLevel,
3704 msg: &str,
3705 answers: &[&str],
3706 ) -> oneshot::Receiver<usize> {
3707 self.app.prompt(self.window_id, level, msg, answers)
3708 }
3709
3710 pub fn prompt_for_paths(
3711 &self,
3712 options: PathPromptOptions,
3713 ) -> oneshot::Receiver<Option<Vec<PathBuf>>> {
3714 self.app.prompt_for_paths(options)
3715 }
3716
3717 pub fn prompt_for_new_path(&self, directory: &Path) -> oneshot::Receiver<Option<PathBuf>> {
3718 self.app.prompt_for_new_path(directory)
3719 }
3720
3721 pub fn debug_elements(&self) -> crate::json::Value {
3722 self.app.debug_elements(self.window_id).unwrap()
3723 }
3724
3725 pub fn focus<S>(&mut self, handle: S)
3726 where
3727 S: Into<AnyViewHandle>,
3728 {
3729 let handle = handle.into();
3730 self.app.focus(handle.window_id, Some(handle.view_id));
3731 }
3732
3733 pub fn focus_self(&mut self) {
3734 self.app.focus(self.window_id, Some(self.view_id));
3735 }
3736
3737 pub fn is_self_focused(&self) -> bool {
3738 self.app.focused_view_id(self.window_id) == Some(self.view_id)
3739 }
3740
3741 pub fn blur(&mut self) {
3742 self.app.focus(self.window_id, None);
3743 }
3744
3745 pub fn set_window_title(&mut self, title: &str) {
3746 let window_id = self.window_id();
3747 if let Some((_, window)) = self.presenters_and_platform_windows.get_mut(&window_id) {
3748 window.set_title(title);
3749 }
3750 }
3751
3752 pub fn set_window_edited(&mut self, edited: bool) {
3753 let window_id = self.window_id();
3754 if let Some((_, window)) = self.presenters_and_platform_windows.get_mut(&window_id) {
3755 window.set_edited(edited);
3756 }
3757 }
3758
3759 pub fn on_window_should_close<F>(&mut self, mut callback: F)
3760 where
3761 F: 'static + FnMut(&mut T, &mut ViewContext<T>) -> bool,
3762 {
3763 let window_id = self.window_id();
3764 let view = self.weak_handle();
3765 self.pending_effects
3766 .push_back(Effect::WindowShouldCloseSubscription {
3767 window_id,
3768 callback: Box::new(move |cx| {
3769 if let Some(view) = view.upgrade(cx) {
3770 view.update(cx, |view, cx| callback(view, cx))
3771 } else {
3772 true
3773 }
3774 }),
3775 });
3776 }
3777
3778 pub fn add_model<S, F>(&mut self, build_model: F) -> ModelHandle<S>
3779 where
3780 S: Entity,
3781 F: FnOnce(&mut ModelContext<S>) -> S,
3782 {
3783 self.app.add_model(build_model)
3784 }
3785
3786 pub fn add_view<S, F>(&mut self, build_view: F) -> ViewHandle<S>
3787 where
3788 S: View,
3789 F: FnOnce(&mut ViewContext<S>) -> S,
3790 {
3791 self.app
3792 .build_and_insert_view(self.window_id, ParentId::View(self.view_id), |cx| {
3793 Some(build_view(cx))
3794 })
3795 .unwrap()
3796 }
3797
3798 pub fn add_option_view<S, F>(&mut self, build_view: F) -> Option<ViewHandle<S>>
3799 where
3800 S: View,
3801 F: FnOnce(&mut ViewContext<S>) -> Option<S>,
3802 {
3803 self.app
3804 .build_and_insert_view(self.window_id, ParentId::View(self.view_id), build_view)
3805 }
3806
3807 pub fn reparent(&mut self, view_handle: impl Into<AnyViewHandle>) {
3808 let view_handle = view_handle.into();
3809 if self.window_id != view_handle.window_id {
3810 panic!("Can't reparent view to a view from a different window");
3811 }
3812 self.cx
3813 .parents
3814 .remove(&(view_handle.window_id, view_handle.view_id));
3815 let new_parent_id = self.view_id;
3816 self.cx.parents.insert(
3817 (view_handle.window_id, view_handle.view_id),
3818 ParentId::View(new_parent_id),
3819 );
3820 }
3821
3822 pub fn replace_root_view<V, F>(&mut self, build_root_view: F) -> ViewHandle<V>
3823 where
3824 V: View,
3825 F: FnOnce(&mut ViewContext<V>) -> V,
3826 {
3827 let window_id = self.window_id;
3828 self.update(|this| {
3829 let root_view = this
3830 .build_and_insert_view(window_id, ParentId::Root, |cx| Some(build_root_view(cx)))
3831 .unwrap();
3832 let window = this.cx.windows.get_mut(&window_id).unwrap();
3833 window.root_view = root_view.clone().into();
3834 window.focused_view_id = Some(root_view.id());
3835 root_view
3836 })
3837 }
3838
3839 pub fn subscribe<E, H, F>(&mut self, handle: &H, mut callback: F) -> Subscription
3840 where
3841 E: Entity,
3842 E::Event: 'static,
3843 H: Handle<E>,
3844 F: 'static + FnMut(&mut T, H, &E::Event, &mut ViewContext<T>),
3845 {
3846 let subscriber = self.weak_handle();
3847 self.app
3848 .subscribe_internal(handle, move |emitter, event, cx| {
3849 if let Some(subscriber) = subscriber.upgrade(cx) {
3850 subscriber.update(cx, |subscriber, cx| {
3851 callback(subscriber, emitter, event, cx);
3852 });
3853 true
3854 } else {
3855 false
3856 }
3857 })
3858 }
3859
3860 pub fn observe<E, F, H>(&mut self, handle: &H, mut callback: F) -> Subscription
3861 where
3862 E: Entity,
3863 H: Handle<E>,
3864 F: 'static + FnMut(&mut T, H, &mut ViewContext<T>),
3865 {
3866 let observer = self.weak_handle();
3867 self.app.observe_internal(handle, move |observed, cx| {
3868 if let Some(observer) = observer.upgrade(cx) {
3869 observer.update(cx, |observer, cx| {
3870 callback(observer, observed, cx);
3871 });
3872 true
3873 } else {
3874 false
3875 }
3876 })
3877 }
3878
3879 pub fn observe_focus<F, V>(&mut self, handle: &ViewHandle<V>, mut callback: F) -> Subscription
3880 where
3881 F: 'static + FnMut(&mut T, ViewHandle<V>, bool, &mut ViewContext<T>),
3882 V: View,
3883 {
3884 let observer = self.weak_handle();
3885 self.app
3886 .observe_focus(handle, move |observed, focused, cx| {
3887 if let Some(observer) = observer.upgrade(cx) {
3888 observer.update(cx, |observer, cx| {
3889 callback(observer, observed, focused, cx);
3890 });
3891 true
3892 } else {
3893 false
3894 }
3895 })
3896 }
3897
3898 pub fn observe_release<E, F, H>(&mut self, handle: &H, mut callback: F) -> Subscription
3899 where
3900 E: Entity,
3901 H: Handle<E>,
3902 F: 'static + FnMut(&mut T, &E, &mut ViewContext<T>),
3903 {
3904 let observer = self.weak_handle();
3905 self.app.observe_release(handle, move |released, cx| {
3906 if let Some(observer) = observer.upgrade(cx) {
3907 observer.update(cx, |observer, cx| {
3908 callback(observer, released, cx);
3909 });
3910 }
3911 })
3912 }
3913
3914 pub fn observe_actions<F>(&mut self, mut callback: F) -> Subscription
3915 where
3916 F: 'static + FnMut(&mut T, TypeId, &mut ViewContext<T>),
3917 {
3918 let observer = self.weak_handle();
3919 self.app.observe_actions(move |action_id, cx| {
3920 if let Some(observer) = observer.upgrade(cx) {
3921 observer.update(cx, |observer, cx| {
3922 callback(observer, action_id, cx);
3923 });
3924 }
3925 })
3926 }
3927
3928 pub fn observe_window_activation<F>(&mut self, mut callback: F) -> Subscription
3929 where
3930 F: 'static + FnMut(&mut T, bool, &mut ViewContext<T>),
3931 {
3932 let observer = self.weak_handle();
3933 self.app
3934 .observe_window_activation(self.window_id(), move |active, cx| {
3935 if let Some(observer) = observer.upgrade(cx) {
3936 observer.update(cx, |observer, cx| {
3937 callback(observer, active, cx);
3938 });
3939 true
3940 } else {
3941 false
3942 }
3943 })
3944 }
3945
3946 pub fn observe_fullscreen<F>(&mut self, mut callback: F) -> Subscription
3947 where
3948 F: 'static + FnMut(&mut T, bool, &mut ViewContext<T>),
3949 {
3950 let observer = self.weak_handle();
3951 self.app
3952 .observe_fullscreen(self.window_id(), move |active, cx| {
3953 if let Some(observer) = observer.upgrade(cx) {
3954 observer.update(cx, |observer, cx| {
3955 callback(observer, active, cx);
3956 });
3957 true
3958 } else {
3959 false
3960 }
3961 })
3962 }
3963
3964 pub fn emit(&mut self, payload: T::Event) {
3965 self.app.pending_effects.push_back(Effect::Event {
3966 entity_id: self.view_id,
3967 payload: Box::new(payload),
3968 });
3969 }
3970
3971 pub fn notify(&mut self) {
3972 self.app.notify_view(self.window_id, self.view_id);
3973 }
3974
3975 pub fn dispatch_any_action(&mut self, action: Box<dyn Action>) {
3976 self.app
3977 .dispatch_any_action_at(self.window_id, self.view_id, action)
3978 }
3979
3980 pub fn defer(&mut self, callback: impl 'static + FnOnce(&mut T, &mut ViewContext<T>)) {
3981 let handle = self.handle();
3982 self.app.defer(move |cx| {
3983 handle.update(cx, |view, cx| {
3984 callback(view, cx);
3985 })
3986 })
3987 }
3988
3989 pub fn after_window_update(
3990 &mut self,
3991 callback: impl 'static + FnOnce(&mut T, &mut ViewContext<T>),
3992 ) {
3993 let handle = self.handle();
3994 self.app.after_window_update(move |cx| {
3995 handle.update(cx, |view, cx| {
3996 callback(view, cx);
3997 })
3998 })
3999 }
4000
4001 pub fn propagate_action(&mut self) {
4002 self.app.halt_action_dispatch = false;
4003 }
4004
4005 pub fn spawn<F, Fut, S>(&self, f: F) -> Task<S>
4006 where
4007 F: FnOnce(ViewHandle<T>, AsyncAppContext) -> Fut,
4008 Fut: 'static + Future<Output = S>,
4009 S: 'static,
4010 {
4011 let handle = self.handle();
4012 self.app.spawn(|cx| f(handle, cx))
4013 }
4014
4015 pub fn spawn_weak<F, Fut, S>(&self, f: F) -> Task<S>
4016 where
4017 F: FnOnce(WeakViewHandle<T>, AsyncAppContext) -> Fut,
4018 Fut: 'static + Future<Output = S>,
4019 S: 'static,
4020 {
4021 let handle = self.weak_handle();
4022 self.app.spawn(|cx| f(handle, cx))
4023 }
4024}
4025
4026pub struct RenderParams {
4027 pub window_id: usize,
4028 pub view_id: usize,
4029 pub titlebar_height: f32,
4030 pub hovered_region_ids: HashSet<MouseRegionId>,
4031 pub clicked_region_ids: Option<(HashSet<MouseRegionId>, MouseButton)>,
4032 pub refreshing: bool,
4033}
4034
4035pub struct RenderContext<'a, T: View> {
4036 pub(crate) window_id: usize,
4037 pub(crate) view_id: usize,
4038 pub(crate) view_type: PhantomData<T>,
4039 pub(crate) hovered_region_ids: HashSet<MouseRegionId>,
4040 pub(crate) clicked_region_ids: Option<(HashSet<MouseRegionId>, MouseButton)>,
4041 pub app: &'a mut MutableAppContext,
4042 pub titlebar_height: f32,
4043 pub refreshing: bool,
4044}
4045
4046#[derive(Clone, Copy, Default)]
4047pub struct MouseState {
4048 pub hovered: bool,
4049 pub clicked: Option<MouseButton>,
4050}
4051
4052impl<'a, V: View> RenderContext<'a, V> {
4053 fn new(params: RenderParams, app: &'a mut MutableAppContext) -> Self {
4054 Self {
4055 app,
4056 window_id: params.window_id,
4057 view_id: params.view_id,
4058 view_type: PhantomData,
4059 titlebar_height: params.titlebar_height,
4060 hovered_region_ids: params.hovered_region_ids.clone(),
4061 clicked_region_ids: params.clicked_region_ids.clone(),
4062 refreshing: params.refreshing,
4063 }
4064 }
4065
4066 pub fn handle(&self) -> WeakViewHandle<V> {
4067 WeakViewHandle::new(self.window_id, self.view_id)
4068 }
4069
4070 pub fn window_id(&self) -> usize {
4071 self.window_id
4072 }
4073
4074 pub fn view_id(&self) -> usize {
4075 self.view_id
4076 }
4077
4078 pub fn mouse_state<Tag: 'static>(&self, region_id: usize) -> MouseState {
4079 let region_id = MouseRegionId::new::<Tag>(self.view_id, region_id);
4080 MouseState {
4081 hovered: self.hovered_region_ids.contains(®ion_id),
4082 clicked: self.clicked_region_ids.as_ref().and_then(|(ids, button)| {
4083 if ids.contains(®ion_id) {
4084 Some(*button)
4085 } else {
4086 None
4087 }
4088 }),
4089 }
4090 }
4091
4092 pub fn element_state<Tag: 'static, T: 'static + Default>(
4093 &mut self,
4094 element_id: usize,
4095 ) -> ElementStateHandle<T> {
4096 let id = ElementStateId {
4097 view_id: self.view_id(),
4098 element_id,
4099 tag: TypeId::of::<Tag>(),
4100 };
4101 self.cx
4102 .element_states
4103 .entry(id)
4104 .or_insert_with(|| Box::new(T::default()));
4105 ElementStateHandle::new(id, self.frame_count, &self.cx.ref_counts)
4106 }
4107}
4108
4109impl AsRef<AppContext> for &AppContext {
4110 fn as_ref(&self) -> &AppContext {
4111 self
4112 }
4113}
4114
4115impl<V: View> Deref for RenderContext<'_, V> {
4116 type Target = MutableAppContext;
4117
4118 fn deref(&self) -> &Self::Target {
4119 self.app
4120 }
4121}
4122
4123impl<V: View> DerefMut for RenderContext<'_, V> {
4124 fn deref_mut(&mut self) -> &mut Self::Target {
4125 self.app
4126 }
4127}
4128
4129impl<V: View> ReadModel for RenderContext<'_, V> {
4130 fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T {
4131 self.app.read_model(handle)
4132 }
4133}
4134
4135impl<V: View> UpdateModel for RenderContext<'_, V> {
4136 fn update_model<T: Entity, O>(
4137 &mut self,
4138 handle: &ModelHandle<T>,
4139 update: &mut dyn FnMut(&mut T, &mut ModelContext<T>) -> O,
4140 ) -> O {
4141 self.app.update_model(handle, update)
4142 }
4143}
4144
4145impl<V: View> ReadView for RenderContext<'_, V> {
4146 fn read_view<T: View>(&self, handle: &ViewHandle<T>) -> &T {
4147 self.app.read_view(handle)
4148 }
4149}
4150
4151impl<M> AsRef<AppContext> for ViewContext<'_, M> {
4152 fn as_ref(&self) -> &AppContext {
4153 &self.app.cx
4154 }
4155}
4156
4157impl<M> Deref for ViewContext<'_, M> {
4158 type Target = MutableAppContext;
4159
4160 fn deref(&self) -> &Self::Target {
4161 self.app
4162 }
4163}
4164
4165impl<M> DerefMut for ViewContext<'_, M> {
4166 fn deref_mut(&mut self) -> &mut Self::Target {
4167 &mut self.app
4168 }
4169}
4170
4171impl<M> AsMut<MutableAppContext> for ViewContext<'_, M> {
4172 fn as_mut(&mut self) -> &mut MutableAppContext {
4173 self.app
4174 }
4175}
4176
4177impl<V> ReadModel for ViewContext<'_, V> {
4178 fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T {
4179 self.app.read_model(handle)
4180 }
4181}
4182
4183impl<V> UpgradeModelHandle for ViewContext<'_, V> {
4184 fn upgrade_model_handle<T: Entity>(
4185 &self,
4186 handle: &WeakModelHandle<T>,
4187 ) -> Option<ModelHandle<T>> {
4188 self.cx.upgrade_model_handle(handle)
4189 }
4190
4191 fn model_handle_is_upgradable<T: Entity>(&self, handle: &WeakModelHandle<T>) -> bool {
4192 self.cx.model_handle_is_upgradable(handle)
4193 }
4194
4195 fn upgrade_any_model_handle(&self, handle: &AnyWeakModelHandle) -> Option<AnyModelHandle> {
4196 self.cx.upgrade_any_model_handle(handle)
4197 }
4198}
4199
4200impl<V> UpgradeViewHandle for ViewContext<'_, V> {
4201 fn upgrade_view_handle<T: View>(&self, handle: &WeakViewHandle<T>) -> Option<ViewHandle<T>> {
4202 self.cx.upgrade_view_handle(handle)
4203 }
4204
4205 fn upgrade_any_view_handle(&self, handle: &AnyWeakViewHandle) -> Option<AnyViewHandle> {
4206 self.cx.upgrade_any_view_handle(handle)
4207 }
4208}
4209
4210impl<V: View> UpgradeViewHandle for RenderContext<'_, V> {
4211 fn upgrade_view_handle<T: View>(&self, handle: &WeakViewHandle<T>) -> Option<ViewHandle<T>> {
4212 self.cx.upgrade_view_handle(handle)
4213 }
4214
4215 fn upgrade_any_view_handle(&self, handle: &AnyWeakViewHandle) -> Option<AnyViewHandle> {
4216 self.cx.upgrade_any_view_handle(handle)
4217 }
4218}
4219
4220impl<V: View> UpdateModel for ViewContext<'_, V> {
4221 fn update_model<T: Entity, O>(
4222 &mut self,
4223 handle: &ModelHandle<T>,
4224 update: &mut dyn FnMut(&mut T, &mut ModelContext<T>) -> O,
4225 ) -> O {
4226 self.app.update_model(handle, update)
4227 }
4228}
4229
4230impl<V: View> ReadView for ViewContext<'_, V> {
4231 fn read_view<T: View>(&self, handle: &ViewHandle<T>) -> &T {
4232 self.app.read_view(handle)
4233 }
4234}
4235
4236impl<V: View> UpdateView for ViewContext<'_, V> {
4237 fn update_view<T, S>(
4238 &mut self,
4239 handle: &ViewHandle<T>,
4240 update: &mut dyn FnMut(&mut T, &mut ViewContext<T>) -> S,
4241 ) -> S
4242 where
4243 T: View,
4244 {
4245 self.app.update_view(handle, update)
4246 }
4247}
4248
4249pub trait Handle<T> {
4250 type Weak: 'static;
4251 fn id(&self) -> usize;
4252 fn location(&self) -> EntityLocation;
4253 fn downgrade(&self) -> Self::Weak;
4254 fn upgrade_from(weak: &Self::Weak, cx: &AppContext) -> Option<Self>
4255 where
4256 Self: Sized;
4257}
4258
4259pub trait WeakHandle {
4260 fn id(&self) -> usize;
4261}
4262
4263#[derive(Clone, Copy, Debug, Eq, PartialEq, Hash)]
4264pub enum EntityLocation {
4265 Model(usize),
4266 View(usize, usize),
4267}
4268
4269pub struct ModelHandle<T: Entity> {
4270 model_id: usize,
4271 model_type: PhantomData<T>,
4272 ref_counts: Arc<Mutex<RefCounts>>,
4273
4274 #[cfg(any(test, feature = "test-support"))]
4275 handle_id: usize,
4276}
4277
4278impl<T: Entity> ModelHandle<T> {
4279 fn new(model_id: usize, ref_counts: &Arc<Mutex<RefCounts>>) -> Self {
4280 ref_counts.lock().inc_model(model_id);
4281
4282 #[cfg(any(test, feature = "test-support"))]
4283 let handle_id = ref_counts
4284 .lock()
4285 .leak_detector
4286 .lock()
4287 .handle_created(Some(type_name::<T>()), model_id);
4288
4289 Self {
4290 model_id,
4291 model_type: PhantomData,
4292 ref_counts: ref_counts.clone(),
4293
4294 #[cfg(any(test, feature = "test-support"))]
4295 handle_id,
4296 }
4297 }
4298
4299 pub fn downgrade(&self) -> WeakModelHandle<T> {
4300 WeakModelHandle::new(self.model_id)
4301 }
4302
4303 pub fn id(&self) -> usize {
4304 self.model_id
4305 }
4306
4307 pub fn read<'a, C: ReadModel>(&self, cx: &'a C) -> &'a T {
4308 cx.read_model(self)
4309 }
4310
4311 pub fn read_with<C, F, S>(&self, cx: &C, read: F) -> S
4312 where
4313 C: ReadModelWith,
4314 F: FnOnce(&T, &AppContext) -> S,
4315 {
4316 let mut read = Some(read);
4317 cx.read_model_with(self, &mut |model, cx| {
4318 let read = read.take().unwrap();
4319 read(model, cx)
4320 })
4321 }
4322
4323 pub fn update<C, F, S>(&self, cx: &mut C, update: F) -> S
4324 where
4325 C: UpdateModel,
4326 F: FnOnce(&mut T, &mut ModelContext<T>) -> S,
4327 {
4328 let mut update = Some(update);
4329 cx.update_model(self, &mut |model, cx| {
4330 let update = update.take().unwrap();
4331 update(model, cx)
4332 })
4333 }
4334
4335 #[cfg(any(test, feature = "test-support"))]
4336 pub fn next_notification(&self, cx: &TestAppContext) -> impl Future<Output = ()> {
4337 let (tx, mut rx) = futures::channel::mpsc::unbounded();
4338 let mut cx = cx.cx.borrow_mut();
4339 let subscription = cx.observe(self, move |_, _| {
4340 tx.unbounded_send(()).ok();
4341 });
4342
4343 let duration = if std::env::var("CI").is_ok() {
4344 Duration::from_secs(5)
4345 } else {
4346 Duration::from_secs(1)
4347 };
4348
4349 async move {
4350 let notification = crate::util::timeout(duration, rx.next())
4351 .await
4352 .expect("next notification timed out");
4353 drop(subscription);
4354 notification.expect("model dropped while test was waiting for its next notification")
4355 }
4356 }
4357
4358 #[cfg(any(test, feature = "test-support"))]
4359 pub fn next_event(&self, cx: &TestAppContext) -> impl Future<Output = T::Event>
4360 where
4361 T::Event: Clone,
4362 {
4363 let (tx, mut rx) = futures::channel::mpsc::unbounded();
4364 let mut cx = cx.cx.borrow_mut();
4365 let subscription = cx.subscribe(self, move |_, event, _| {
4366 tx.unbounded_send(event.clone()).ok();
4367 });
4368
4369 let duration = if std::env::var("CI").is_ok() {
4370 Duration::from_secs(5)
4371 } else {
4372 Duration::from_secs(1)
4373 };
4374
4375 cx.foreground.start_waiting();
4376 async move {
4377 let event = crate::util::timeout(duration, rx.next())
4378 .await
4379 .expect("next event timed out");
4380 drop(subscription);
4381 event.expect("model dropped while test was waiting for its next event")
4382 }
4383 }
4384
4385 #[cfg(any(test, feature = "test-support"))]
4386 pub fn condition(
4387 &self,
4388 cx: &TestAppContext,
4389 mut predicate: impl FnMut(&T, &AppContext) -> bool,
4390 ) -> impl Future<Output = ()> {
4391 let (tx, mut rx) = futures::channel::mpsc::unbounded();
4392
4393 let mut cx = cx.cx.borrow_mut();
4394 let subscriptions = (
4395 cx.observe(self, {
4396 let tx = tx.clone();
4397 move |_, _| {
4398 tx.unbounded_send(()).ok();
4399 }
4400 }),
4401 cx.subscribe(self, {
4402 move |_, _, _| {
4403 tx.unbounded_send(()).ok();
4404 }
4405 }),
4406 );
4407
4408 let cx = cx.weak_self.as_ref().unwrap().upgrade().unwrap();
4409 let handle = self.downgrade();
4410 let duration = if std::env::var("CI").is_ok() {
4411 Duration::from_secs(5)
4412 } else {
4413 Duration::from_secs(1)
4414 };
4415
4416 async move {
4417 crate::util::timeout(duration, async move {
4418 loop {
4419 {
4420 let cx = cx.borrow();
4421 let cx = cx.as_ref();
4422 if predicate(
4423 handle
4424 .upgrade(cx)
4425 .expect("model dropped with pending condition")
4426 .read(cx),
4427 cx,
4428 ) {
4429 break;
4430 }
4431 }
4432
4433 cx.borrow().foreground().start_waiting();
4434 rx.next()
4435 .await
4436 .expect("model dropped with pending condition");
4437 cx.borrow().foreground().finish_waiting();
4438 }
4439 })
4440 .await
4441 .expect("condition timed out");
4442 drop(subscriptions);
4443 }
4444 }
4445}
4446
4447impl<T: Entity> Clone for ModelHandle<T> {
4448 fn clone(&self) -> Self {
4449 Self::new(self.model_id, &self.ref_counts)
4450 }
4451}
4452
4453impl<T: Entity> PartialEq for ModelHandle<T> {
4454 fn eq(&self, other: &Self) -> bool {
4455 self.model_id == other.model_id
4456 }
4457}
4458
4459impl<T: Entity> Eq for ModelHandle<T> {}
4460
4461impl<T: Entity> PartialEq<WeakModelHandle<T>> for ModelHandle<T> {
4462 fn eq(&self, other: &WeakModelHandle<T>) -> bool {
4463 self.model_id == other.model_id
4464 }
4465}
4466
4467impl<T: Entity> Hash for ModelHandle<T> {
4468 fn hash<H: Hasher>(&self, state: &mut H) {
4469 self.model_id.hash(state);
4470 }
4471}
4472
4473impl<T: Entity> std::borrow::Borrow<usize> for ModelHandle<T> {
4474 fn borrow(&self) -> &usize {
4475 &self.model_id
4476 }
4477}
4478
4479impl<T: Entity> Debug for ModelHandle<T> {
4480 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
4481 f.debug_tuple(&format!("ModelHandle<{}>", type_name::<T>()))
4482 .field(&self.model_id)
4483 .finish()
4484 }
4485}
4486
4487unsafe impl<T: Entity> Send for ModelHandle<T> {}
4488unsafe impl<T: Entity> Sync for ModelHandle<T> {}
4489
4490impl<T: Entity> Drop for ModelHandle<T> {
4491 fn drop(&mut self) {
4492 let mut ref_counts = self.ref_counts.lock();
4493 ref_counts.dec_model(self.model_id);
4494
4495 #[cfg(any(test, feature = "test-support"))]
4496 ref_counts
4497 .leak_detector
4498 .lock()
4499 .handle_dropped(self.model_id, self.handle_id);
4500 }
4501}
4502
4503impl<T: Entity> Handle<T> for ModelHandle<T> {
4504 type Weak = WeakModelHandle<T>;
4505
4506 fn id(&self) -> usize {
4507 self.model_id
4508 }
4509
4510 fn location(&self) -> EntityLocation {
4511 EntityLocation::Model(self.model_id)
4512 }
4513
4514 fn downgrade(&self) -> Self::Weak {
4515 self.downgrade()
4516 }
4517
4518 fn upgrade_from(weak: &Self::Weak, cx: &AppContext) -> Option<Self>
4519 where
4520 Self: Sized,
4521 {
4522 weak.upgrade(cx)
4523 }
4524}
4525
4526pub struct WeakModelHandle<T> {
4527 model_id: usize,
4528 model_type: PhantomData<T>,
4529}
4530
4531impl<T> WeakHandle for WeakModelHandle<T> {
4532 fn id(&self) -> usize {
4533 self.model_id
4534 }
4535}
4536
4537unsafe impl<T> Send for WeakModelHandle<T> {}
4538unsafe impl<T> Sync for WeakModelHandle<T> {}
4539
4540impl<T: Entity> WeakModelHandle<T> {
4541 fn new(model_id: usize) -> Self {
4542 Self {
4543 model_id,
4544 model_type: PhantomData,
4545 }
4546 }
4547
4548 pub fn id(&self) -> usize {
4549 self.model_id
4550 }
4551
4552 pub fn is_upgradable(&self, cx: &impl UpgradeModelHandle) -> bool {
4553 cx.model_handle_is_upgradable(self)
4554 }
4555
4556 pub fn upgrade(&self, cx: &impl UpgradeModelHandle) -> Option<ModelHandle<T>> {
4557 cx.upgrade_model_handle(self)
4558 }
4559}
4560
4561impl<T> Hash for WeakModelHandle<T> {
4562 fn hash<H: Hasher>(&self, state: &mut H) {
4563 self.model_id.hash(state)
4564 }
4565}
4566
4567impl<T> PartialEq for WeakModelHandle<T> {
4568 fn eq(&self, other: &Self) -> bool {
4569 self.model_id == other.model_id
4570 }
4571}
4572
4573impl<T> Eq for WeakModelHandle<T> {}
4574
4575impl<T> Clone for WeakModelHandle<T> {
4576 fn clone(&self) -> Self {
4577 Self {
4578 model_id: self.model_id,
4579 model_type: PhantomData,
4580 }
4581 }
4582}
4583
4584impl<T> Copy for WeakModelHandle<T> {}
4585
4586pub struct ViewHandle<T> {
4587 window_id: usize,
4588 view_id: usize,
4589 view_type: PhantomData<T>,
4590 ref_counts: Arc<Mutex<RefCounts>>,
4591 #[cfg(any(test, feature = "test-support"))]
4592 handle_id: usize,
4593}
4594
4595impl<T: View> ViewHandle<T> {
4596 fn new(window_id: usize, view_id: usize, ref_counts: &Arc<Mutex<RefCounts>>) -> Self {
4597 ref_counts.lock().inc_view(window_id, view_id);
4598 #[cfg(any(test, feature = "test-support"))]
4599 let handle_id = ref_counts
4600 .lock()
4601 .leak_detector
4602 .lock()
4603 .handle_created(Some(type_name::<T>()), view_id);
4604
4605 Self {
4606 window_id,
4607 view_id,
4608 view_type: PhantomData,
4609 ref_counts: ref_counts.clone(),
4610
4611 #[cfg(any(test, feature = "test-support"))]
4612 handle_id,
4613 }
4614 }
4615
4616 pub fn downgrade(&self) -> WeakViewHandle<T> {
4617 WeakViewHandle::new(self.window_id, self.view_id)
4618 }
4619
4620 pub fn window_id(&self) -> usize {
4621 self.window_id
4622 }
4623
4624 pub fn id(&self) -> usize {
4625 self.view_id
4626 }
4627
4628 pub fn read<'a, C: ReadView>(&self, cx: &'a C) -> &'a T {
4629 cx.read_view(self)
4630 }
4631
4632 pub fn read_with<C, F, S>(&self, cx: &C, read: F) -> S
4633 where
4634 C: ReadViewWith,
4635 F: FnOnce(&T, &AppContext) -> S,
4636 {
4637 let mut read = Some(read);
4638 cx.read_view_with(self, &mut |view, cx| {
4639 let read = read.take().unwrap();
4640 read(view, cx)
4641 })
4642 }
4643
4644 pub fn update<C, F, S>(&self, cx: &mut C, update: F) -> S
4645 where
4646 C: UpdateView,
4647 F: FnOnce(&mut T, &mut ViewContext<T>) -> S,
4648 {
4649 let mut update = Some(update);
4650 cx.update_view(self, &mut |view, cx| {
4651 let update = update.take().unwrap();
4652 update(view, cx)
4653 })
4654 }
4655
4656 pub fn defer<C, F>(&self, cx: &mut C, update: F)
4657 where
4658 C: AsMut<MutableAppContext>,
4659 F: 'static + FnOnce(&mut T, &mut ViewContext<T>),
4660 {
4661 let this = self.clone();
4662 cx.as_mut().defer(move |cx| {
4663 this.update(cx, |view, cx| update(view, cx));
4664 });
4665 }
4666
4667 pub fn is_focused(&self, cx: &AppContext) -> bool {
4668 cx.focused_view_id(self.window_id)
4669 .map_or(false, |focused_id| focused_id == self.view_id)
4670 }
4671
4672 #[cfg(any(test, feature = "test-support"))]
4673 pub fn next_notification(&self, cx: &TestAppContext) -> impl Future<Output = ()> {
4674 use postage::prelude::{Sink as _, Stream as _};
4675
4676 let (mut tx, mut rx) = postage::mpsc::channel(1);
4677 let mut cx = cx.cx.borrow_mut();
4678 let subscription = cx.observe(self, move |_, _| {
4679 tx.try_send(()).ok();
4680 });
4681
4682 let duration = if std::env::var("CI").is_ok() {
4683 Duration::from_secs(5)
4684 } else {
4685 Duration::from_secs(1)
4686 };
4687
4688 async move {
4689 let notification = crate::util::timeout(duration, rx.recv())
4690 .await
4691 .expect("next notification timed out");
4692 drop(subscription);
4693 notification.expect("model dropped while test was waiting for its next notification")
4694 }
4695 }
4696
4697 #[cfg(any(test, feature = "test-support"))]
4698 pub fn condition(
4699 &self,
4700 cx: &TestAppContext,
4701 mut predicate: impl FnMut(&T, &AppContext) -> bool,
4702 ) -> impl Future<Output = ()> {
4703 use postage::prelude::{Sink as _, Stream as _};
4704
4705 let (tx, mut rx) = postage::mpsc::channel(1024);
4706 let timeout_duration = cx.condition_duration();
4707
4708 let mut cx = cx.cx.borrow_mut();
4709 let subscriptions = self.update(&mut *cx, |_, cx| {
4710 (
4711 cx.observe(self, {
4712 let mut tx = tx.clone();
4713 move |_, _, _| {
4714 tx.blocking_send(()).ok();
4715 }
4716 }),
4717 cx.subscribe(self, {
4718 let mut tx = tx.clone();
4719 move |_, _, _, _| {
4720 tx.blocking_send(()).ok();
4721 }
4722 }),
4723 )
4724 });
4725
4726 let cx = cx.weak_self.as_ref().unwrap().upgrade().unwrap();
4727 let handle = self.downgrade();
4728
4729 async move {
4730 crate::util::timeout(timeout_duration, async move {
4731 loop {
4732 {
4733 let cx = cx.borrow();
4734 let cx = cx.as_ref();
4735 if predicate(
4736 handle
4737 .upgrade(cx)
4738 .expect("view dropped with pending condition")
4739 .read(cx),
4740 cx,
4741 ) {
4742 break;
4743 }
4744 }
4745
4746 cx.borrow().foreground().start_waiting();
4747 rx.recv()
4748 .await
4749 .expect("view dropped with pending condition");
4750 cx.borrow().foreground().finish_waiting();
4751 }
4752 })
4753 .await
4754 .expect("condition timed out");
4755 drop(subscriptions);
4756 }
4757 }
4758}
4759
4760impl<T: View> Clone for ViewHandle<T> {
4761 fn clone(&self) -> Self {
4762 ViewHandle::new(self.window_id, self.view_id, &self.ref_counts)
4763 }
4764}
4765
4766impl<T> PartialEq for ViewHandle<T> {
4767 fn eq(&self, other: &Self) -> bool {
4768 self.window_id == other.window_id && self.view_id == other.view_id
4769 }
4770}
4771
4772impl<T> PartialEq<WeakViewHandle<T>> for ViewHandle<T> {
4773 fn eq(&self, other: &WeakViewHandle<T>) -> bool {
4774 self.window_id == other.window_id && self.view_id == other.view_id
4775 }
4776}
4777
4778impl<T> PartialEq<ViewHandle<T>> for WeakViewHandle<T> {
4779 fn eq(&self, other: &ViewHandle<T>) -> bool {
4780 self.window_id == other.window_id && self.view_id == other.view_id
4781 }
4782}
4783
4784impl<T> Eq for ViewHandle<T> {}
4785
4786impl<T> Hash for ViewHandle<T> {
4787 fn hash<H: Hasher>(&self, state: &mut H) {
4788 self.window_id.hash(state);
4789 self.view_id.hash(state);
4790 }
4791}
4792
4793impl<T> Debug for ViewHandle<T> {
4794 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
4795 f.debug_struct(&format!("ViewHandle<{}>", type_name::<T>()))
4796 .field("window_id", &self.window_id)
4797 .field("view_id", &self.view_id)
4798 .finish()
4799 }
4800}
4801
4802impl<T> Drop for ViewHandle<T> {
4803 fn drop(&mut self) {
4804 self.ref_counts
4805 .lock()
4806 .dec_view(self.window_id, self.view_id);
4807 #[cfg(any(test, feature = "test-support"))]
4808 self.ref_counts
4809 .lock()
4810 .leak_detector
4811 .lock()
4812 .handle_dropped(self.view_id, self.handle_id);
4813 }
4814}
4815
4816impl<T: View> Handle<T> for ViewHandle<T> {
4817 type Weak = WeakViewHandle<T>;
4818
4819 fn id(&self) -> usize {
4820 self.view_id
4821 }
4822
4823 fn location(&self) -> EntityLocation {
4824 EntityLocation::View(self.window_id, self.view_id)
4825 }
4826
4827 fn downgrade(&self) -> Self::Weak {
4828 self.downgrade()
4829 }
4830
4831 fn upgrade_from(weak: &Self::Weak, cx: &AppContext) -> Option<Self>
4832 where
4833 Self: Sized,
4834 {
4835 weak.upgrade(cx)
4836 }
4837}
4838
4839pub struct AnyViewHandle {
4840 window_id: usize,
4841 view_id: usize,
4842 view_type: TypeId,
4843 ref_counts: Arc<Mutex<RefCounts>>,
4844
4845 #[cfg(any(test, feature = "test-support"))]
4846 handle_id: usize,
4847}
4848
4849impl AnyViewHandle {
4850 fn new(
4851 window_id: usize,
4852 view_id: usize,
4853 view_type: TypeId,
4854 ref_counts: Arc<Mutex<RefCounts>>,
4855 ) -> Self {
4856 ref_counts.lock().inc_view(window_id, view_id);
4857
4858 #[cfg(any(test, feature = "test-support"))]
4859 let handle_id = ref_counts
4860 .lock()
4861 .leak_detector
4862 .lock()
4863 .handle_created(None, view_id);
4864
4865 Self {
4866 window_id,
4867 view_id,
4868 view_type,
4869 ref_counts,
4870 #[cfg(any(test, feature = "test-support"))]
4871 handle_id,
4872 }
4873 }
4874
4875 pub fn id(&self) -> usize {
4876 self.view_id
4877 }
4878
4879 pub fn is<T: 'static>(&self) -> bool {
4880 TypeId::of::<T>() == self.view_type
4881 }
4882
4883 pub fn is_focused(&self, cx: &AppContext) -> bool {
4884 cx.focused_view_id(self.window_id)
4885 .map_or(false, |focused_id| focused_id == self.view_id)
4886 }
4887
4888 pub fn downcast<T: View>(self) -> Option<ViewHandle<T>> {
4889 if self.is::<T>() {
4890 let result = Some(ViewHandle {
4891 window_id: self.window_id,
4892 view_id: self.view_id,
4893 ref_counts: self.ref_counts.clone(),
4894 view_type: PhantomData,
4895 #[cfg(any(test, feature = "test-support"))]
4896 handle_id: self.handle_id,
4897 });
4898 unsafe {
4899 Arc::decrement_strong_count(Arc::as_ptr(&self.ref_counts));
4900 }
4901 std::mem::forget(self);
4902 result
4903 } else {
4904 None
4905 }
4906 }
4907
4908 pub fn downgrade(&self) -> AnyWeakViewHandle {
4909 AnyWeakViewHandle {
4910 window_id: self.window_id,
4911 view_id: self.view_id,
4912 view_type: self.view_type,
4913 }
4914 }
4915
4916 pub fn view_type(&self) -> TypeId {
4917 self.view_type
4918 }
4919
4920 pub fn debug_json(&self, cx: &AppContext) -> serde_json::Value {
4921 cx.views
4922 .get(&(self.window_id, self.view_id))
4923 .map_or_else(|| serde_json::Value::Null, |view| view.debug_json(cx))
4924 }
4925}
4926
4927impl Clone for AnyViewHandle {
4928 fn clone(&self) -> Self {
4929 Self::new(
4930 self.window_id,
4931 self.view_id,
4932 self.view_type,
4933 self.ref_counts.clone(),
4934 )
4935 }
4936}
4937
4938impl From<&AnyViewHandle> for AnyViewHandle {
4939 fn from(handle: &AnyViewHandle) -> Self {
4940 handle.clone()
4941 }
4942}
4943
4944impl<T: View> From<&ViewHandle<T>> for AnyViewHandle {
4945 fn from(handle: &ViewHandle<T>) -> Self {
4946 Self::new(
4947 handle.window_id,
4948 handle.view_id,
4949 TypeId::of::<T>(),
4950 handle.ref_counts.clone(),
4951 )
4952 }
4953}
4954
4955impl<T: View> From<ViewHandle<T>> for AnyViewHandle {
4956 fn from(handle: ViewHandle<T>) -> Self {
4957 let any_handle = AnyViewHandle {
4958 window_id: handle.window_id,
4959 view_id: handle.view_id,
4960 view_type: TypeId::of::<T>(),
4961 ref_counts: handle.ref_counts.clone(),
4962 #[cfg(any(test, feature = "test-support"))]
4963 handle_id: handle.handle_id,
4964 };
4965
4966 unsafe {
4967 Arc::decrement_strong_count(Arc::as_ptr(&handle.ref_counts));
4968 }
4969 std::mem::forget(handle);
4970 any_handle
4971 }
4972}
4973
4974impl Drop for AnyViewHandle {
4975 fn drop(&mut self) {
4976 self.ref_counts
4977 .lock()
4978 .dec_view(self.window_id, self.view_id);
4979 #[cfg(any(test, feature = "test-support"))]
4980 self.ref_counts
4981 .lock()
4982 .leak_detector
4983 .lock()
4984 .handle_dropped(self.view_id, self.handle_id);
4985 }
4986}
4987
4988pub struct AnyModelHandle {
4989 model_id: usize,
4990 model_type: TypeId,
4991 ref_counts: Arc<Mutex<RefCounts>>,
4992
4993 #[cfg(any(test, feature = "test-support"))]
4994 handle_id: usize,
4995}
4996
4997impl AnyModelHandle {
4998 fn new(model_id: usize, model_type: TypeId, ref_counts: Arc<Mutex<RefCounts>>) -> Self {
4999 ref_counts.lock().inc_model(model_id);
5000
5001 #[cfg(any(test, feature = "test-support"))]
5002 let handle_id = ref_counts
5003 .lock()
5004 .leak_detector
5005 .lock()
5006 .handle_created(None, model_id);
5007
5008 Self {
5009 model_id,
5010 model_type,
5011 ref_counts,
5012
5013 #[cfg(any(test, feature = "test-support"))]
5014 handle_id,
5015 }
5016 }
5017
5018 pub fn downcast<T: Entity>(self) -> Option<ModelHandle<T>> {
5019 if self.is::<T>() {
5020 let result = Some(ModelHandle {
5021 model_id: self.model_id,
5022 model_type: PhantomData,
5023 ref_counts: self.ref_counts.clone(),
5024
5025 #[cfg(any(test, feature = "test-support"))]
5026 handle_id: self.handle_id,
5027 });
5028 unsafe {
5029 Arc::decrement_strong_count(Arc::as_ptr(&self.ref_counts));
5030 }
5031 std::mem::forget(self);
5032 result
5033 } else {
5034 None
5035 }
5036 }
5037
5038 pub fn downgrade(&self) -> AnyWeakModelHandle {
5039 AnyWeakModelHandle {
5040 model_id: self.model_id,
5041 model_type: self.model_type,
5042 }
5043 }
5044
5045 pub fn is<T: Entity>(&self) -> bool {
5046 self.model_type == TypeId::of::<T>()
5047 }
5048
5049 pub fn model_type(&self) -> TypeId {
5050 self.model_type
5051 }
5052}
5053
5054impl<T: Entity> From<ModelHandle<T>> for AnyModelHandle {
5055 fn from(handle: ModelHandle<T>) -> Self {
5056 Self::new(
5057 handle.model_id,
5058 TypeId::of::<T>(),
5059 handle.ref_counts.clone(),
5060 )
5061 }
5062}
5063
5064impl Clone for AnyModelHandle {
5065 fn clone(&self) -> Self {
5066 Self::new(self.model_id, self.model_type, self.ref_counts.clone())
5067 }
5068}
5069
5070impl Drop for AnyModelHandle {
5071 fn drop(&mut self) {
5072 let mut ref_counts = self.ref_counts.lock();
5073 ref_counts.dec_model(self.model_id);
5074
5075 #[cfg(any(test, feature = "test-support"))]
5076 ref_counts
5077 .leak_detector
5078 .lock()
5079 .handle_dropped(self.model_id, self.handle_id);
5080 }
5081}
5082
5083#[derive(Hash, PartialEq, Eq, Debug)]
5084pub struct AnyWeakModelHandle {
5085 model_id: usize,
5086 model_type: TypeId,
5087}
5088
5089impl AnyWeakModelHandle {
5090 pub fn upgrade(&self, cx: &impl UpgradeModelHandle) -> Option<AnyModelHandle> {
5091 cx.upgrade_any_model_handle(self)
5092 }
5093 pub fn model_type(&self) -> TypeId {
5094 self.model_type
5095 }
5096
5097 fn is<T: 'static>(&self) -> bool {
5098 TypeId::of::<T>() == self.model_type
5099 }
5100
5101 pub fn downcast<T: Entity>(&self) -> Option<WeakModelHandle<T>> {
5102 if self.is::<T>() {
5103 let result = Some(WeakModelHandle {
5104 model_id: self.model_id,
5105 model_type: PhantomData,
5106 });
5107
5108 result
5109 } else {
5110 None
5111 }
5112 }
5113}
5114
5115impl<T: Entity> From<WeakModelHandle<T>> for AnyWeakModelHandle {
5116 fn from(handle: WeakModelHandle<T>) -> Self {
5117 AnyWeakModelHandle {
5118 model_id: handle.model_id,
5119 model_type: TypeId::of::<T>(),
5120 }
5121 }
5122}
5123
5124#[derive(Debug)]
5125pub struct WeakViewHandle<T> {
5126 window_id: usize,
5127 view_id: usize,
5128 view_type: PhantomData<T>,
5129}
5130
5131impl<T> WeakHandle for WeakViewHandle<T> {
5132 fn id(&self) -> usize {
5133 self.view_id
5134 }
5135}
5136
5137impl<T: View> WeakViewHandle<T> {
5138 fn new(window_id: usize, view_id: usize) -> Self {
5139 Self {
5140 window_id,
5141 view_id,
5142 view_type: PhantomData,
5143 }
5144 }
5145
5146 pub fn id(&self) -> usize {
5147 self.view_id
5148 }
5149
5150 pub fn window_id(&self) -> usize {
5151 self.window_id
5152 }
5153
5154 pub fn upgrade(&self, cx: &impl UpgradeViewHandle) -> Option<ViewHandle<T>> {
5155 cx.upgrade_view_handle(self)
5156 }
5157}
5158
5159impl<T> Clone for WeakViewHandle<T> {
5160 fn clone(&self) -> Self {
5161 Self {
5162 window_id: self.window_id,
5163 view_id: self.view_id,
5164 view_type: PhantomData,
5165 }
5166 }
5167}
5168
5169impl<T> PartialEq for WeakViewHandle<T> {
5170 fn eq(&self, other: &Self) -> bool {
5171 self.window_id == other.window_id && self.view_id == other.view_id
5172 }
5173}
5174
5175impl<T> Eq for WeakViewHandle<T> {}
5176
5177impl<T> Hash for WeakViewHandle<T> {
5178 fn hash<H: Hasher>(&self, state: &mut H) {
5179 self.window_id.hash(state);
5180 self.view_id.hash(state);
5181 }
5182}
5183
5184pub struct AnyWeakViewHandle {
5185 window_id: usize,
5186 view_id: usize,
5187 view_type: TypeId,
5188}
5189
5190impl AnyWeakViewHandle {
5191 pub fn upgrade(&self, cx: &impl UpgradeViewHandle) -> Option<AnyViewHandle> {
5192 cx.upgrade_any_view_handle(self)
5193 }
5194}
5195
5196impl<T: View> From<WeakViewHandle<T>> for AnyWeakViewHandle {
5197 fn from(handle: WeakViewHandle<T>) -> Self {
5198 AnyWeakViewHandle {
5199 window_id: handle.window_id,
5200 view_id: handle.view_id,
5201 view_type: TypeId::of::<T>(),
5202 }
5203 }
5204}
5205
5206#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
5207pub struct ElementStateId {
5208 view_id: usize,
5209 element_id: usize,
5210 tag: TypeId,
5211}
5212
5213pub struct ElementStateHandle<T> {
5214 value_type: PhantomData<T>,
5215 id: ElementStateId,
5216 ref_counts: Weak<Mutex<RefCounts>>,
5217}
5218
5219impl<T: 'static> ElementStateHandle<T> {
5220 fn new(id: ElementStateId, frame_id: usize, ref_counts: &Arc<Mutex<RefCounts>>) -> Self {
5221 ref_counts.lock().inc_element_state(id, frame_id);
5222 Self {
5223 value_type: PhantomData,
5224 id,
5225 ref_counts: Arc::downgrade(ref_counts),
5226 }
5227 }
5228
5229 pub fn read<'a>(&self, cx: &'a AppContext) -> &'a T {
5230 cx.element_states
5231 .get(&self.id)
5232 .unwrap()
5233 .downcast_ref()
5234 .unwrap()
5235 }
5236
5237 pub fn update<C, R>(&self, cx: &mut C, f: impl FnOnce(&mut T, &mut C) -> R) -> R
5238 where
5239 C: DerefMut<Target = MutableAppContext>,
5240 {
5241 let mut element_state = cx.deref_mut().cx.element_states.remove(&self.id).unwrap();
5242 let result = f(element_state.downcast_mut().unwrap(), cx);
5243 cx.deref_mut()
5244 .cx
5245 .element_states
5246 .insert(self.id, element_state);
5247 result
5248 }
5249}
5250
5251impl<T> Drop for ElementStateHandle<T> {
5252 fn drop(&mut self) {
5253 if let Some(ref_counts) = self.ref_counts.upgrade() {
5254 ref_counts.lock().dec_element_state(self.id);
5255 }
5256 }
5257}
5258
5259#[must_use]
5260pub enum Subscription {
5261 Subscription {
5262 id: usize,
5263 entity_id: usize,
5264 subscriptions: Option<Weak<Mapping<usize, SubscriptionCallback>>>,
5265 },
5266 GlobalSubscription {
5267 id: usize,
5268 type_id: TypeId,
5269 subscriptions: Option<Weak<Mapping<TypeId, GlobalSubscriptionCallback>>>,
5270 },
5271 Observation {
5272 id: usize,
5273 entity_id: usize,
5274 observations: Option<Weak<Mapping<usize, ObservationCallback>>>,
5275 },
5276 GlobalObservation {
5277 id: usize,
5278 type_id: TypeId,
5279 observations: Option<Weak<Mapping<TypeId, GlobalObservationCallback>>>,
5280 },
5281 FocusObservation {
5282 id: usize,
5283 view_id: usize,
5284 observations: Option<Weak<Mapping<usize, FocusObservationCallback>>>,
5285 },
5286 WindowActivationObservation {
5287 id: usize,
5288 window_id: usize,
5289 observations: Option<Weak<Mapping<usize, WindowActivationCallback>>>,
5290 },
5291 WindowFullscreenObservation {
5292 id: usize,
5293 window_id: usize,
5294 observations: Option<Weak<Mapping<usize, WindowFullscreenCallback>>>,
5295 },
5296
5297 ReleaseObservation {
5298 id: usize,
5299 entity_id: usize,
5300 #[allow(clippy::type_complexity)]
5301 observations:
5302 Option<Weak<Mutex<HashMap<usize, BTreeMap<usize, ReleaseObservationCallback>>>>>,
5303 },
5304 ActionObservation {
5305 id: usize,
5306 observations: Option<Weak<Mutex<BTreeMap<usize, ActionObservationCallback>>>>,
5307 },
5308}
5309
5310impl Subscription {
5311 pub fn detach(&mut self) {
5312 match self {
5313 Subscription::Subscription { subscriptions, .. } => {
5314 subscriptions.take();
5315 }
5316 Subscription::GlobalSubscription { subscriptions, .. } => {
5317 subscriptions.take();
5318 }
5319 Subscription::Observation { observations, .. } => {
5320 observations.take();
5321 }
5322 Subscription::GlobalObservation { observations, .. } => {
5323 observations.take();
5324 }
5325 Subscription::ReleaseObservation { observations, .. } => {
5326 observations.take();
5327 }
5328 Subscription::FocusObservation { observations, .. } => {
5329 observations.take();
5330 }
5331 Subscription::ActionObservation { observations, .. } => {
5332 observations.take();
5333 }
5334 Subscription::WindowActivationObservation { observations, .. } => {
5335 observations.take();
5336 }
5337 Subscription::WindowFullscreenObservation { observations, .. } => {
5338 observations.take();
5339 }
5340 }
5341 }
5342}
5343
5344impl Drop for Subscription {
5345 fn drop(&mut self) {
5346 match self {
5347 Subscription::Subscription {
5348 id,
5349 entity_id,
5350 subscriptions,
5351 } => {
5352 if let Some(subscriptions) = subscriptions.as_ref().and_then(Weak::upgrade) {
5353 match subscriptions
5354 .lock()
5355 .entry(*entity_id)
5356 .or_default()
5357 .entry(*id)
5358 {
5359 btree_map::Entry::Vacant(entry) => {
5360 entry.insert(None);
5361 }
5362 btree_map::Entry::Occupied(entry) => {
5363 entry.remove();
5364 }
5365 }
5366 }
5367 }
5368 Subscription::GlobalSubscription {
5369 id,
5370 type_id,
5371 subscriptions,
5372 } => {
5373 if let Some(subscriptions) = subscriptions.as_ref().and_then(Weak::upgrade) {
5374 match subscriptions.lock().entry(*type_id).or_default().entry(*id) {
5375 btree_map::Entry::Vacant(entry) => {
5376 entry.insert(None);
5377 }
5378 btree_map::Entry::Occupied(entry) => {
5379 entry.remove();
5380 }
5381 }
5382 }
5383 }
5384 Subscription::Observation {
5385 id,
5386 entity_id,
5387 observations,
5388 } => {
5389 if let Some(observations) = observations.as_ref().and_then(Weak::upgrade) {
5390 match observations
5391 .lock()
5392 .entry(*entity_id)
5393 .or_default()
5394 .entry(*id)
5395 {
5396 btree_map::Entry::Vacant(entry) => {
5397 entry.insert(None);
5398 }
5399 btree_map::Entry::Occupied(entry) => {
5400 entry.remove();
5401 }
5402 }
5403 }
5404 }
5405 Subscription::GlobalObservation {
5406 id,
5407 type_id,
5408 observations,
5409 } => {
5410 if let Some(observations) = observations.as_ref().and_then(Weak::upgrade) {
5411 match observations.lock().entry(*type_id).or_default().entry(*id) {
5412 collections::btree_map::Entry::Vacant(entry) => {
5413 entry.insert(None);
5414 }
5415 collections::btree_map::Entry::Occupied(entry) => {
5416 entry.remove();
5417 }
5418 }
5419 }
5420 }
5421 Subscription::ReleaseObservation {
5422 id,
5423 entity_id,
5424 observations,
5425 } => {
5426 if let Some(observations) = observations.as_ref().and_then(Weak::upgrade) {
5427 if let Some(observations) = observations.lock().get_mut(entity_id) {
5428 observations.remove(id);
5429 }
5430 }
5431 }
5432 Subscription::FocusObservation {
5433 id,
5434 view_id,
5435 observations,
5436 } => {
5437 if let Some(observations) = observations.as_ref().and_then(Weak::upgrade) {
5438 match observations.lock().entry(*view_id).or_default().entry(*id) {
5439 btree_map::Entry::Vacant(entry) => {
5440 entry.insert(None);
5441 }
5442 btree_map::Entry::Occupied(entry) => {
5443 entry.remove();
5444 }
5445 }
5446 }
5447 }
5448 Subscription::ActionObservation { id, observations } => {
5449 if let Some(observations) = observations.as_ref().and_then(Weak::upgrade) {
5450 observations.lock().remove(id);
5451 }
5452 }
5453 Subscription::WindowActivationObservation {
5454 id,
5455 window_id,
5456 observations,
5457 } => {
5458 if let Some(observations) = observations.as_ref().and_then(Weak::upgrade) {
5459 match observations
5460 .lock()
5461 .entry(*window_id)
5462 .or_default()
5463 .entry(*id)
5464 {
5465 btree_map::Entry::Vacant(entry) => {
5466 entry.insert(None);
5467 }
5468 btree_map::Entry::Occupied(entry) => {
5469 entry.remove();
5470 }
5471 }
5472 }
5473 }
5474 Subscription::WindowFullscreenObservation {
5475 id,
5476 window_id,
5477 observations,
5478 } => {
5479 if let Some(observations) = observations.as_ref().and_then(Weak::upgrade) {
5480 match observations
5481 .lock()
5482 .entry(*window_id)
5483 .or_default()
5484 .entry(*id)
5485 {
5486 btree_map::Entry::Vacant(entry) => {
5487 entry.insert(None);
5488 }
5489 btree_map::Entry::Occupied(entry) => {
5490 entry.remove();
5491 }
5492 }
5493 }
5494 }
5495 }
5496 }
5497}
5498
5499lazy_static! {
5500 static ref LEAK_BACKTRACE: bool =
5501 std::env::var("LEAK_BACKTRACE").map_or(false, |b| !b.is_empty());
5502}
5503
5504#[cfg(any(test, feature = "test-support"))]
5505#[derive(Default)]
5506pub struct LeakDetector {
5507 next_handle_id: usize,
5508 #[allow(clippy::type_complexity)]
5509 handle_backtraces: HashMap<
5510 usize,
5511 (
5512 Option<&'static str>,
5513 HashMap<usize, Option<backtrace::Backtrace>>,
5514 ),
5515 >,
5516}
5517
5518#[cfg(any(test, feature = "test-support"))]
5519impl LeakDetector {
5520 fn handle_created(&mut self, type_name: Option<&'static str>, entity_id: usize) -> usize {
5521 let handle_id = post_inc(&mut self.next_handle_id);
5522 let entry = self.handle_backtraces.entry(entity_id).or_default();
5523 let backtrace = if *LEAK_BACKTRACE {
5524 Some(backtrace::Backtrace::new_unresolved())
5525 } else {
5526 None
5527 };
5528 if let Some(type_name) = type_name {
5529 entry.0.get_or_insert(type_name);
5530 }
5531 entry.1.insert(handle_id, backtrace);
5532 handle_id
5533 }
5534
5535 fn handle_dropped(&mut self, entity_id: usize, handle_id: usize) {
5536 if let Some((_, backtraces)) = self.handle_backtraces.get_mut(&entity_id) {
5537 assert!(backtraces.remove(&handle_id).is_some());
5538 if backtraces.is_empty() {
5539 self.handle_backtraces.remove(&entity_id);
5540 }
5541 }
5542 }
5543
5544 pub fn assert_dropped(&mut self, entity_id: usize) {
5545 if let Some((type_name, backtraces)) = self.handle_backtraces.get_mut(&entity_id) {
5546 for trace in backtraces.values_mut().flatten() {
5547 trace.resolve();
5548 eprintln!("{:?}", crate::util::CwdBacktrace(trace));
5549 }
5550
5551 let hint = if *LEAK_BACKTRACE {
5552 ""
5553 } else {
5554 " – set LEAK_BACKTRACE=1 for more information"
5555 };
5556
5557 panic!(
5558 "{} handles to {} {} still exist{}",
5559 backtraces.len(),
5560 type_name.unwrap_or("entity"),
5561 entity_id,
5562 hint
5563 );
5564 }
5565 }
5566
5567 pub fn detect(&mut self) {
5568 let mut found_leaks = false;
5569 for (id, (type_name, backtraces)) in self.handle_backtraces.iter_mut() {
5570 eprintln!(
5571 "leaked {} handles to {} {}",
5572 backtraces.len(),
5573 type_name.unwrap_or("entity"),
5574 id
5575 );
5576 for trace in backtraces.values_mut().flatten() {
5577 trace.resolve();
5578 eprintln!("{:?}", crate::util::CwdBacktrace(trace));
5579 }
5580 found_leaks = true;
5581 }
5582
5583 let hint = if *LEAK_BACKTRACE {
5584 ""
5585 } else {
5586 " – set LEAK_BACKTRACE=1 for more information"
5587 };
5588 assert!(!found_leaks, "detected leaked handles{}", hint);
5589 }
5590}
5591
5592#[derive(Default)]
5593struct RefCounts {
5594 entity_counts: HashMap<usize, usize>,
5595 element_state_counts: HashMap<ElementStateId, ElementStateRefCount>,
5596 dropped_models: HashSet<usize>,
5597 dropped_views: HashSet<(usize, usize)>,
5598 dropped_element_states: HashSet<ElementStateId>,
5599
5600 #[cfg(any(test, feature = "test-support"))]
5601 leak_detector: Arc<Mutex<LeakDetector>>,
5602}
5603
5604struct ElementStateRefCount {
5605 ref_count: usize,
5606 frame_id: usize,
5607}
5608
5609impl RefCounts {
5610 fn inc_model(&mut self, model_id: usize) {
5611 match self.entity_counts.entry(model_id) {
5612 Entry::Occupied(mut entry) => {
5613 *entry.get_mut() += 1;
5614 }
5615 Entry::Vacant(entry) => {
5616 entry.insert(1);
5617 self.dropped_models.remove(&model_id);
5618 }
5619 }
5620 }
5621
5622 fn inc_view(&mut self, window_id: usize, view_id: usize) {
5623 match self.entity_counts.entry(view_id) {
5624 Entry::Occupied(mut entry) => *entry.get_mut() += 1,
5625 Entry::Vacant(entry) => {
5626 entry.insert(1);
5627 self.dropped_views.remove(&(window_id, view_id));
5628 }
5629 }
5630 }
5631
5632 fn inc_element_state(&mut self, id: ElementStateId, frame_id: usize) {
5633 match self.element_state_counts.entry(id) {
5634 Entry::Occupied(mut entry) => {
5635 let entry = entry.get_mut();
5636 if entry.frame_id == frame_id || entry.ref_count >= 2 {
5637 panic!("used the same element state more than once in the same frame");
5638 }
5639 entry.ref_count += 1;
5640 entry.frame_id = frame_id;
5641 }
5642 Entry::Vacant(entry) => {
5643 entry.insert(ElementStateRefCount {
5644 ref_count: 1,
5645 frame_id,
5646 });
5647 self.dropped_element_states.remove(&id);
5648 }
5649 }
5650 }
5651
5652 fn dec_model(&mut self, model_id: usize) {
5653 let count = self.entity_counts.get_mut(&model_id).unwrap();
5654 *count -= 1;
5655 if *count == 0 {
5656 self.entity_counts.remove(&model_id);
5657 self.dropped_models.insert(model_id);
5658 }
5659 }
5660
5661 fn dec_view(&mut self, window_id: usize, view_id: usize) {
5662 let count = self.entity_counts.get_mut(&view_id).unwrap();
5663 *count -= 1;
5664 if *count == 0 {
5665 self.entity_counts.remove(&view_id);
5666 self.dropped_views.insert((window_id, view_id));
5667 }
5668 }
5669
5670 fn dec_element_state(&mut self, id: ElementStateId) {
5671 let entry = self.element_state_counts.get_mut(&id).unwrap();
5672 entry.ref_count -= 1;
5673 if entry.ref_count == 0 {
5674 self.element_state_counts.remove(&id);
5675 self.dropped_element_states.insert(id);
5676 }
5677 }
5678
5679 fn is_entity_alive(&self, entity_id: usize) -> bool {
5680 self.entity_counts.contains_key(&entity_id)
5681 }
5682
5683 fn take_dropped(
5684 &mut self,
5685 ) -> (
5686 HashSet<usize>,
5687 HashSet<(usize, usize)>,
5688 HashSet<ElementStateId>,
5689 ) {
5690 (
5691 std::mem::take(&mut self.dropped_models),
5692 std::mem::take(&mut self.dropped_views),
5693 std::mem::take(&mut self.dropped_element_states),
5694 )
5695 }
5696}
5697
5698#[cfg(test)]
5699mod tests {
5700 use super::*;
5701 use crate::{actions, elements::*, impl_actions, MouseButton, MouseButtonEvent};
5702 use serde::Deserialize;
5703 use smol::future::poll_once;
5704 use std::{
5705 cell::Cell,
5706 sync::atomic::{AtomicBool, AtomicUsize, Ordering::SeqCst},
5707 };
5708
5709 #[crate::test(self)]
5710 fn test_model_handles(cx: &mut MutableAppContext) {
5711 struct Model {
5712 other: Option<ModelHandle<Model>>,
5713 events: Vec<String>,
5714 }
5715
5716 impl Entity for Model {
5717 type Event = usize;
5718 }
5719
5720 impl Model {
5721 fn new(other: Option<ModelHandle<Self>>, cx: &mut ModelContext<Self>) -> Self {
5722 if let Some(other) = other.as_ref() {
5723 cx.observe(other, |me, _, _| {
5724 me.events.push("notified".into());
5725 })
5726 .detach();
5727 cx.subscribe(other, |me, _, event, _| {
5728 me.events.push(format!("observed event {}", event));
5729 })
5730 .detach();
5731 }
5732
5733 Self {
5734 other,
5735 events: Vec::new(),
5736 }
5737 }
5738 }
5739
5740 let handle_1 = cx.add_model(|cx| Model::new(None, cx));
5741 let handle_2 = cx.add_model(|cx| Model::new(Some(handle_1.clone()), cx));
5742 assert_eq!(cx.cx.models.len(), 2);
5743
5744 handle_1.update(cx, |model, cx| {
5745 model.events.push("updated".into());
5746 cx.emit(1);
5747 cx.notify();
5748 cx.emit(2);
5749 });
5750 assert_eq!(handle_1.read(cx).events, vec!["updated".to_string()]);
5751 assert_eq!(
5752 handle_2.read(cx).events,
5753 vec![
5754 "observed event 1".to_string(),
5755 "notified".to_string(),
5756 "observed event 2".to_string(),
5757 ]
5758 );
5759
5760 handle_2.update(cx, |model, _| {
5761 drop(handle_1);
5762 model.other.take();
5763 });
5764
5765 assert_eq!(cx.cx.models.len(), 1);
5766 assert!(cx.subscriptions.is_empty());
5767 assert!(cx.observations.is_empty());
5768 }
5769
5770 #[crate::test(self)]
5771 fn test_model_events(cx: &mut MutableAppContext) {
5772 #[derive(Default)]
5773 struct Model {
5774 events: Vec<usize>,
5775 }
5776
5777 impl Entity for Model {
5778 type Event = usize;
5779 }
5780
5781 let handle_1 = cx.add_model(|_| Model::default());
5782 let handle_2 = cx.add_model(|_| Model::default());
5783
5784 handle_1.update(cx, |_, cx| {
5785 cx.subscribe(&handle_2, move |model: &mut Model, emitter, event, cx| {
5786 model.events.push(*event);
5787
5788 cx.subscribe(&emitter, |model, _, event, _| {
5789 model.events.push(*event * 2);
5790 })
5791 .detach();
5792 })
5793 .detach();
5794 });
5795
5796 handle_2.update(cx, |_, c| c.emit(7));
5797 assert_eq!(handle_1.read(cx).events, vec![7]);
5798
5799 handle_2.update(cx, |_, c| c.emit(5));
5800 assert_eq!(handle_1.read(cx).events, vec![7, 5, 10]);
5801 }
5802
5803 #[crate::test(self)]
5804 fn test_model_emit_before_subscribe_in_same_update_cycle(cx: &mut MutableAppContext) {
5805 #[derive(Default)]
5806 struct Model;
5807
5808 impl Entity for Model {
5809 type Event = ();
5810 }
5811
5812 let events = Rc::new(RefCell::new(Vec::new()));
5813 cx.add_model(|cx| {
5814 drop(cx.subscribe(&cx.handle(), {
5815 let events = events.clone();
5816 move |_, _, _, _| events.borrow_mut().push("dropped before flush")
5817 }));
5818 cx.subscribe(&cx.handle(), {
5819 let events = events.clone();
5820 move |_, _, _, _| events.borrow_mut().push("before emit")
5821 })
5822 .detach();
5823 cx.emit(());
5824 cx.subscribe(&cx.handle(), {
5825 let events = events.clone();
5826 move |_, _, _, _| events.borrow_mut().push("after emit")
5827 })
5828 .detach();
5829 Model
5830 });
5831 assert_eq!(*events.borrow(), ["before emit"]);
5832 }
5833
5834 #[crate::test(self)]
5835 fn test_observe_and_notify_from_model(cx: &mut MutableAppContext) {
5836 #[derive(Default)]
5837 struct Model {
5838 count: usize,
5839 events: Vec<usize>,
5840 }
5841
5842 impl Entity for Model {
5843 type Event = ();
5844 }
5845
5846 let handle_1 = cx.add_model(|_| Model::default());
5847 let handle_2 = cx.add_model(|_| Model::default());
5848
5849 handle_1.update(cx, |_, c| {
5850 c.observe(&handle_2, move |model, observed, c| {
5851 model.events.push(observed.read(c).count);
5852 c.observe(&observed, |model, observed, c| {
5853 model.events.push(observed.read(c).count * 2);
5854 })
5855 .detach();
5856 })
5857 .detach();
5858 });
5859
5860 handle_2.update(cx, |model, c| {
5861 model.count = 7;
5862 c.notify()
5863 });
5864 assert_eq!(handle_1.read(cx).events, vec![7]);
5865
5866 handle_2.update(cx, |model, c| {
5867 model.count = 5;
5868 c.notify()
5869 });
5870 assert_eq!(handle_1.read(cx).events, vec![7, 5, 10])
5871 }
5872
5873 #[crate::test(self)]
5874 fn test_model_notify_before_observe_in_same_update_cycle(cx: &mut MutableAppContext) {
5875 #[derive(Default)]
5876 struct Model;
5877
5878 impl Entity for Model {
5879 type Event = ();
5880 }
5881
5882 let events = Rc::new(RefCell::new(Vec::new()));
5883 cx.add_model(|cx| {
5884 drop(cx.observe(&cx.handle(), {
5885 let events = events.clone();
5886 move |_, _, _| events.borrow_mut().push("dropped before flush")
5887 }));
5888 cx.observe(&cx.handle(), {
5889 let events = events.clone();
5890 move |_, _, _| events.borrow_mut().push("before notify")
5891 })
5892 .detach();
5893 cx.notify();
5894 cx.observe(&cx.handle(), {
5895 let events = events.clone();
5896 move |_, _, _| events.borrow_mut().push("after notify")
5897 })
5898 .detach();
5899 Model
5900 });
5901 assert_eq!(*events.borrow(), ["before notify"]);
5902 }
5903
5904 #[crate::test(self)]
5905 fn test_defer_and_after_window_update(cx: &mut MutableAppContext) {
5906 struct View {
5907 render_count: usize,
5908 }
5909
5910 impl Entity for View {
5911 type Event = usize;
5912 }
5913
5914 impl super::View for View {
5915 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
5916 post_inc(&mut self.render_count);
5917 Empty::new().boxed()
5918 }
5919
5920 fn ui_name() -> &'static str {
5921 "View"
5922 }
5923 }
5924
5925 let (_, view) = cx.add_window(Default::default(), |_| View { render_count: 0 });
5926 let called_defer = Rc::new(AtomicBool::new(false));
5927 let called_after_window_update = Rc::new(AtomicBool::new(false));
5928
5929 view.update(cx, |this, cx| {
5930 assert_eq!(this.render_count, 1);
5931 cx.defer({
5932 let called_defer = called_defer.clone();
5933 move |this, _| {
5934 assert_eq!(this.render_count, 1);
5935 called_defer.store(true, SeqCst);
5936 }
5937 });
5938 cx.after_window_update({
5939 let called_after_window_update = called_after_window_update.clone();
5940 move |this, cx| {
5941 assert_eq!(this.render_count, 2);
5942 called_after_window_update.store(true, SeqCst);
5943 cx.notify();
5944 }
5945 });
5946 assert!(!called_defer.load(SeqCst));
5947 assert!(!called_after_window_update.load(SeqCst));
5948 cx.notify();
5949 });
5950
5951 assert!(called_defer.load(SeqCst));
5952 assert!(called_after_window_update.load(SeqCst));
5953 assert_eq!(view.read(cx).render_count, 3);
5954 }
5955
5956 #[crate::test(self)]
5957 fn test_view_handles(cx: &mut MutableAppContext) {
5958 struct View {
5959 other: Option<ViewHandle<View>>,
5960 events: Vec<String>,
5961 }
5962
5963 impl Entity for View {
5964 type Event = usize;
5965 }
5966
5967 impl super::View for View {
5968 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
5969 Empty::new().boxed()
5970 }
5971
5972 fn ui_name() -> &'static str {
5973 "View"
5974 }
5975 }
5976
5977 impl View {
5978 fn new(other: Option<ViewHandle<View>>, cx: &mut ViewContext<Self>) -> Self {
5979 if let Some(other) = other.as_ref() {
5980 cx.subscribe(other, |me, _, event, _| {
5981 me.events.push(format!("observed event {}", event));
5982 })
5983 .detach();
5984 }
5985 Self {
5986 other,
5987 events: Vec::new(),
5988 }
5989 }
5990 }
5991
5992 let (_, root_view) = cx.add_window(Default::default(), |cx| View::new(None, cx));
5993 let handle_1 = cx.add_view(&root_view, |cx| View::new(None, cx));
5994 let handle_2 = cx.add_view(&root_view, |cx| View::new(Some(handle_1.clone()), cx));
5995 assert_eq!(cx.cx.views.len(), 3);
5996
5997 handle_1.update(cx, |view, cx| {
5998 view.events.push("updated".into());
5999 cx.emit(1);
6000 cx.emit(2);
6001 });
6002 assert_eq!(handle_1.read(cx).events, vec!["updated".to_string()]);
6003 assert_eq!(
6004 handle_2.read(cx).events,
6005 vec![
6006 "observed event 1".to_string(),
6007 "observed event 2".to_string(),
6008 ]
6009 );
6010
6011 handle_2.update(cx, |view, _| {
6012 drop(handle_1);
6013 view.other.take();
6014 });
6015
6016 assert_eq!(cx.cx.views.len(), 2);
6017 assert!(cx.subscriptions.is_empty());
6018 assert!(cx.observations.is_empty());
6019 }
6020
6021 #[crate::test(self)]
6022 fn test_add_window(cx: &mut MutableAppContext) {
6023 struct View {
6024 mouse_down_count: Arc<AtomicUsize>,
6025 }
6026
6027 impl Entity for View {
6028 type Event = ();
6029 }
6030
6031 impl super::View for View {
6032 fn render(&mut self, cx: &mut RenderContext<Self>) -> ElementBox {
6033 enum Handler {}
6034 let mouse_down_count = self.mouse_down_count.clone();
6035 MouseEventHandler::<Handler>::new(0, cx, |_, _| Empty::new().boxed())
6036 .on_down(MouseButton::Left, move |_, _| {
6037 mouse_down_count.fetch_add(1, SeqCst);
6038 })
6039 .boxed()
6040 }
6041
6042 fn ui_name() -> &'static str {
6043 "View"
6044 }
6045 }
6046
6047 let mouse_down_count = Arc::new(AtomicUsize::new(0));
6048 let (window_id, _) = cx.add_window(Default::default(), |_| View {
6049 mouse_down_count: mouse_down_count.clone(),
6050 });
6051 let presenter = cx.presenters_and_platform_windows[&window_id].0.clone();
6052 // Ensure window's root element is in a valid lifecycle state.
6053 presenter.borrow_mut().dispatch_event(
6054 Event::MouseDown(MouseButtonEvent {
6055 position: Default::default(),
6056 button: MouseButton::Left,
6057 ctrl: false,
6058 alt: false,
6059 shift: false,
6060 cmd: false,
6061 click_count: 1,
6062 }),
6063 false,
6064 cx,
6065 );
6066 assert_eq!(mouse_down_count.load(SeqCst), 1);
6067 }
6068
6069 #[crate::test(self)]
6070 fn test_entity_release_hooks(cx: &mut MutableAppContext) {
6071 struct Model {
6072 released: Rc<Cell<bool>>,
6073 }
6074
6075 struct View {
6076 released: Rc<Cell<bool>>,
6077 }
6078
6079 impl Entity for Model {
6080 type Event = ();
6081
6082 fn release(&mut self, _: &mut MutableAppContext) {
6083 self.released.set(true);
6084 }
6085 }
6086
6087 impl Entity for View {
6088 type Event = ();
6089
6090 fn release(&mut self, _: &mut MutableAppContext) {
6091 self.released.set(true);
6092 }
6093 }
6094
6095 impl super::View for View {
6096 fn ui_name() -> &'static str {
6097 "View"
6098 }
6099
6100 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
6101 Empty::new().boxed()
6102 }
6103 }
6104
6105 let model_released = Rc::new(Cell::new(false));
6106 let model_release_observed = Rc::new(Cell::new(false));
6107 let view_released = Rc::new(Cell::new(false));
6108 let view_release_observed = Rc::new(Cell::new(false));
6109
6110 let model = cx.add_model(|_| Model {
6111 released: model_released.clone(),
6112 });
6113 let (window_id, view) = cx.add_window(Default::default(), |_| View {
6114 released: view_released.clone(),
6115 });
6116 assert!(!model_released.get());
6117 assert!(!view_released.get());
6118
6119 cx.observe_release(&model, {
6120 let model_release_observed = model_release_observed.clone();
6121 move |_, _| model_release_observed.set(true)
6122 })
6123 .detach();
6124 cx.observe_release(&view, {
6125 let view_release_observed = view_release_observed.clone();
6126 move |_, _| view_release_observed.set(true)
6127 })
6128 .detach();
6129
6130 cx.update(move |_| {
6131 drop(model);
6132 });
6133 assert!(model_released.get());
6134 assert!(model_release_observed.get());
6135
6136 drop(view);
6137 cx.remove_window(window_id);
6138 assert!(view_released.get());
6139 assert!(view_release_observed.get());
6140 }
6141
6142 #[crate::test(self)]
6143 fn test_view_events(cx: &mut MutableAppContext) {
6144 #[derive(Default)]
6145 struct View {
6146 events: Vec<usize>,
6147 }
6148
6149 impl Entity for View {
6150 type Event = usize;
6151 }
6152
6153 impl super::View for View {
6154 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
6155 Empty::new().boxed()
6156 }
6157
6158 fn ui_name() -> &'static str {
6159 "View"
6160 }
6161 }
6162
6163 struct Model;
6164
6165 impl Entity for Model {
6166 type Event = usize;
6167 }
6168
6169 let (_, handle_1) = cx.add_window(Default::default(), |_| View::default());
6170 let handle_2 = cx.add_view(&handle_1, |_| View::default());
6171 let handle_3 = cx.add_model(|_| Model);
6172
6173 handle_1.update(cx, |_, cx| {
6174 cx.subscribe(&handle_2, move |me, emitter, event, cx| {
6175 me.events.push(*event);
6176
6177 cx.subscribe(&emitter, |me, _, event, _| {
6178 me.events.push(*event * 2);
6179 })
6180 .detach();
6181 })
6182 .detach();
6183
6184 cx.subscribe(&handle_3, |me, _, event, _| {
6185 me.events.push(*event);
6186 })
6187 .detach();
6188 });
6189
6190 handle_2.update(cx, |_, c| c.emit(7));
6191 assert_eq!(handle_1.read(cx).events, vec![7]);
6192
6193 handle_2.update(cx, |_, c| c.emit(5));
6194 assert_eq!(handle_1.read(cx).events, vec![7, 5, 10]);
6195
6196 handle_3.update(cx, |_, c| c.emit(9));
6197 assert_eq!(handle_1.read(cx).events, vec![7, 5, 10, 9]);
6198 }
6199
6200 #[crate::test(self)]
6201 fn test_global_events(cx: &mut MutableAppContext) {
6202 #[derive(Clone, Debug, Eq, PartialEq)]
6203 struct GlobalEvent(u64);
6204
6205 let events = Rc::new(RefCell::new(Vec::new()));
6206 let first_subscription;
6207 let second_subscription;
6208
6209 {
6210 let events = events.clone();
6211 first_subscription = cx.subscribe_global(move |e: &GlobalEvent, _| {
6212 events.borrow_mut().push(("First", e.clone()));
6213 });
6214 }
6215
6216 {
6217 let events = events.clone();
6218 second_subscription = cx.subscribe_global(move |e: &GlobalEvent, _| {
6219 events.borrow_mut().push(("Second", e.clone()));
6220 });
6221 }
6222
6223 cx.update(|cx| {
6224 cx.emit_global(GlobalEvent(1));
6225 cx.emit_global(GlobalEvent(2));
6226 });
6227
6228 drop(first_subscription);
6229
6230 cx.update(|cx| {
6231 cx.emit_global(GlobalEvent(3));
6232 });
6233
6234 drop(second_subscription);
6235
6236 cx.update(|cx| {
6237 cx.emit_global(GlobalEvent(4));
6238 });
6239
6240 assert_eq!(
6241 &*events.borrow(),
6242 &[
6243 ("First", GlobalEvent(1)),
6244 ("Second", GlobalEvent(1)),
6245 ("First", GlobalEvent(2)),
6246 ("Second", GlobalEvent(2)),
6247 ("Second", GlobalEvent(3)),
6248 ]
6249 );
6250 }
6251
6252 #[crate::test(self)]
6253 fn test_global_events_emitted_before_subscription_in_same_update_cycle(
6254 cx: &mut MutableAppContext,
6255 ) {
6256 let events = Rc::new(RefCell::new(Vec::new()));
6257 cx.update(|cx| {
6258 {
6259 let events = events.clone();
6260 drop(cx.subscribe_global(move |_: &(), _| {
6261 events.borrow_mut().push("dropped before emit");
6262 }));
6263 }
6264
6265 {
6266 let events = events.clone();
6267 cx.subscribe_global(move |_: &(), _| {
6268 events.borrow_mut().push("before emit");
6269 })
6270 .detach();
6271 }
6272
6273 cx.emit_global(());
6274
6275 {
6276 let events = events.clone();
6277 cx.subscribe_global(move |_: &(), _| {
6278 events.borrow_mut().push("after emit");
6279 })
6280 .detach();
6281 }
6282 });
6283
6284 assert_eq!(*events.borrow(), ["before emit"]);
6285 }
6286
6287 #[crate::test(self)]
6288 fn test_global_nested_events(cx: &mut MutableAppContext) {
6289 #[derive(Clone, Debug, Eq, PartialEq)]
6290 struct GlobalEvent(u64);
6291
6292 let events = Rc::new(RefCell::new(Vec::new()));
6293
6294 {
6295 let events = events.clone();
6296 cx.subscribe_global(move |e: &GlobalEvent, cx| {
6297 events.borrow_mut().push(("Outer", e.clone()));
6298
6299 if e.0 == 1 {
6300 let events = events.clone();
6301 cx.subscribe_global(move |e: &GlobalEvent, _| {
6302 events.borrow_mut().push(("Inner", e.clone()));
6303 })
6304 .detach();
6305 }
6306 })
6307 .detach();
6308 }
6309
6310 cx.update(|cx| {
6311 cx.emit_global(GlobalEvent(1));
6312 cx.emit_global(GlobalEvent(2));
6313 cx.emit_global(GlobalEvent(3));
6314 });
6315 cx.update(|cx| {
6316 cx.emit_global(GlobalEvent(4));
6317 });
6318
6319 assert_eq!(
6320 &*events.borrow(),
6321 &[
6322 ("Outer", GlobalEvent(1)),
6323 ("Outer", GlobalEvent(2)),
6324 ("Outer", GlobalEvent(3)),
6325 ("Outer", GlobalEvent(4)),
6326 ("Inner", GlobalEvent(4)),
6327 ]
6328 );
6329 }
6330
6331 #[crate::test(self)]
6332 fn test_global(cx: &mut MutableAppContext) {
6333 type Global = usize;
6334
6335 let observation_count = Rc::new(RefCell::new(0));
6336 let subscription = cx.observe_global::<Global, _>({
6337 let observation_count = observation_count.clone();
6338 move |_| {
6339 *observation_count.borrow_mut() += 1;
6340 }
6341 });
6342
6343 assert!(!cx.has_global::<Global>());
6344 assert_eq!(cx.default_global::<Global>(), &0);
6345 assert_eq!(*observation_count.borrow(), 1);
6346 assert!(cx.has_global::<Global>());
6347 assert_eq!(
6348 cx.update_global::<Global, _, _>(|global, _| {
6349 *global = 1;
6350 "Update Result"
6351 }),
6352 "Update Result"
6353 );
6354 assert_eq!(*observation_count.borrow(), 2);
6355 assert_eq!(cx.global::<Global>(), &1);
6356
6357 drop(subscription);
6358 cx.update_global::<Global, _, _>(|global, _| {
6359 *global = 2;
6360 });
6361 assert_eq!(*observation_count.borrow(), 2);
6362
6363 type OtherGlobal = f32;
6364
6365 let observation_count = Rc::new(RefCell::new(0));
6366 cx.observe_global::<OtherGlobal, _>({
6367 let observation_count = observation_count.clone();
6368 move |_| {
6369 *observation_count.borrow_mut() += 1;
6370 }
6371 })
6372 .detach();
6373
6374 assert_eq!(
6375 cx.update_default_global::<OtherGlobal, _, _>(|global, _| {
6376 assert_eq!(global, &0.0);
6377 *global = 2.0;
6378 "Default update result"
6379 }),
6380 "Default update result"
6381 );
6382 assert_eq!(cx.global::<OtherGlobal>(), &2.0);
6383 assert_eq!(*observation_count.borrow(), 1);
6384 }
6385
6386 #[crate::test(self)]
6387 fn test_dropping_subscribers(cx: &mut MutableAppContext) {
6388 struct View;
6389
6390 impl Entity for View {
6391 type Event = ();
6392 }
6393
6394 impl super::View for View {
6395 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
6396 Empty::new().boxed()
6397 }
6398
6399 fn ui_name() -> &'static str {
6400 "View"
6401 }
6402 }
6403
6404 struct Model;
6405
6406 impl Entity for Model {
6407 type Event = ();
6408 }
6409
6410 let (_, root_view) = cx.add_window(Default::default(), |_| View);
6411 let observing_view = cx.add_view(&root_view, |_| View);
6412 let emitting_view = cx.add_view(&root_view, |_| View);
6413 let observing_model = cx.add_model(|_| Model);
6414 let observed_model = cx.add_model(|_| Model);
6415
6416 observing_view.update(cx, |_, cx| {
6417 cx.subscribe(&emitting_view, |_, _, _, _| {}).detach();
6418 cx.subscribe(&observed_model, |_, _, _, _| {}).detach();
6419 });
6420 observing_model.update(cx, |_, cx| {
6421 cx.subscribe(&observed_model, |_, _, _, _| {}).detach();
6422 });
6423
6424 cx.update(|_| {
6425 drop(observing_view);
6426 drop(observing_model);
6427 });
6428
6429 emitting_view.update(cx, |_, cx| cx.emit(()));
6430 observed_model.update(cx, |_, cx| cx.emit(()));
6431 }
6432
6433 #[crate::test(self)]
6434 fn test_view_emit_before_subscribe_in_same_update_cycle(cx: &mut MutableAppContext) {
6435 #[derive(Default)]
6436 struct TestView;
6437
6438 impl Entity for TestView {
6439 type Event = ();
6440 }
6441
6442 impl View for TestView {
6443 fn ui_name() -> &'static str {
6444 "TestView"
6445 }
6446
6447 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
6448 Empty::new().boxed()
6449 }
6450 }
6451
6452 let events = Rc::new(RefCell::new(Vec::new()));
6453 cx.add_window(Default::default(), |cx| {
6454 drop(cx.subscribe(&cx.handle(), {
6455 let events = events.clone();
6456 move |_, _, _, _| events.borrow_mut().push("dropped before flush")
6457 }));
6458 cx.subscribe(&cx.handle(), {
6459 let events = events.clone();
6460 move |_, _, _, _| events.borrow_mut().push("before emit")
6461 })
6462 .detach();
6463 cx.emit(());
6464 cx.subscribe(&cx.handle(), {
6465 let events = events.clone();
6466 move |_, _, _, _| events.borrow_mut().push("after emit")
6467 })
6468 .detach();
6469 TestView
6470 });
6471 assert_eq!(*events.borrow(), ["before emit"]);
6472 }
6473
6474 #[crate::test(self)]
6475 fn test_observe_and_notify_from_view(cx: &mut MutableAppContext) {
6476 #[derive(Default)]
6477 struct View {
6478 events: Vec<usize>,
6479 }
6480
6481 impl Entity for View {
6482 type Event = usize;
6483 }
6484
6485 impl super::View for View {
6486 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
6487 Empty::new().boxed()
6488 }
6489
6490 fn ui_name() -> &'static str {
6491 "View"
6492 }
6493 }
6494
6495 #[derive(Default)]
6496 struct Model {
6497 count: usize,
6498 }
6499
6500 impl Entity for Model {
6501 type Event = ();
6502 }
6503
6504 let (_, view) = cx.add_window(Default::default(), |_| View::default());
6505 let model = cx.add_model(|_| Model::default());
6506
6507 view.update(cx, |_, c| {
6508 c.observe(&model, |me, observed, c| {
6509 me.events.push(observed.read(c).count)
6510 })
6511 .detach();
6512 });
6513
6514 model.update(cx, |model, c| {
6515 model.count = 11;
6516 c.notify();
6517 });
6518 assert_eq!(view.read(cx).events, vec![11]);
6519 }
6520
6521 #[crate::test(self)]
6522 fn test_view_notify_before_observe_in_same_update_cycle(cx: &mut MutableAppContext) {
6523 #[derive(Default)]
6524 struct TestView;
6525
6526 impl Entity for TestView {
6527 type Event = ();
6528 }
6529
6530 impl View for TestView {
6531 fn ui_name() -> &'static str {
6532 "TestView"
6533 }
6534
6535 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
6536 Empty::new().boxed()
6537 }
6538 }
6539
6540 let events = Rc::new(RefCell::new(Vec::new()));
6541 cx.add_window(Default::default(), |cx| {
6542 drop(cx.observe(&cx.handle(), {
6543 let events = events.clone();
6544 move |_, _, _| events.borrow_mut().push("dropped before flush")
6545 }));
6546 cx.observe(&cx.handle(), {
6547 let events = events.clone();
6548 move |_, _, _| events.borrow_mut().push("before notify")
6549 })
6550 .detach();
6551 cx.notify();
6552 cx.observe(&cx.handle(), {
6553 let events = events.clone();
6554 move |_, _, _| events.borrow_mut().push("after notify")
6555 })
6556 .detach();
6557 TestView
6558 });
6559 assert_eq!(*events.borrow(), ["before notify"]);
6560 }
6561
6562 #[crate::test(self)]
6563 fn test_dropping_observers(cx: &mut MutableAppContext) {
6564 struct View;
6565
6566 impl Entity for View {
6567 type Event = ();
6568 }
6569
6570 impl super::View for View {
6571 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
6572 Empty::new().boxed()
6573 }
6574
6575 fn ui_name() -> &'static str {
6576 "View"
6577 }
6578 }
6579
6580 struct Model;
6581
6582 impl Entity for Model {
6583 type Event = ();
6584 }
6585
6586 let (_, root_view) = cx.add_window(Default::default(), |_| View);
6587 let observing_view = cx.add_view(root_view, |_| View);
6588 let observing_model = cx.add_model(|_| Model);
6589 let observed_model = cx.add_model(|_| Model);
6590
6591 observing_view.update(cx, |_, cx| {
6592 cx.observe(&observed_model, |_, _, _| {}).detach();
6593 });
6594 observing_model.update(cx, |_, cx| {
6595 cx.observe(&observed_model, |_, _, _| {}).detach();
6596 });
6597
6598 cx.update(|_| {
6599 drop(observing_view);
6600 drop(observing_model);
6601 });
6602
6603 observed_model.update(cx, |_, cx| cx.notify());
6604 }
6605
6606 #[crate::test(self)]
6607 fn test_dropping_subscriptions_during_callback(cx: &mut MutableAppContext) {
6608 struct Model;
6609
6610 impl Entity for Model {
6611 type Event = u64;
6612 }
6613
6614 // Events
6615 let observing_model = cx.add_model(|_| Model);
6616 let observed_model = cx.add_model(|_| Model);
6617
6618 let events = Rc::new(RefCell::new(Vec::new()));
6619
6620 observing_model.update(cx, |_, cx| {
6621 let events = events.clone();
6622 let subscription = Rc::new(RefCell::new(None));
6623 *subscription.borrow_mut() = Some(cx.subscribe(&observed_model, {
6624 let subscription = subscription.clone();
6625 move |_, _, e, _| {
6626 subscription.borrow_mut().take();
6627 events.borrow_mut().push(*e);
6628 }
6629 }));
6630 });
6631
6632 observed_model.update(cx, |_, cx| {
6633 cx.emit(1);
6634 cx.emit(2);
6635 });
6636
6637 assert_eq!(*events.borrow(), [1]);
6638
6639 // Global Events
6640 #[derive(Clone, Debug, Eq, PartialEq)]
6641 struct GlobalEvent(u64);
6642
6643 let events = Rc::new(RefCell::new(Vec::new()));
6644
6645 {
6646 let events = events.clone();
6647 let subscription = Rc::new(RefCell::new(None));
6648 *subscription.borrow_mut() = Some(cx.subscribe_global({
6649 let subscription = subscription.clone();
6650 move |e: &GlobalEvent, _| {
6651 subscription.borrow_mut().take();
6652 events.borrow_mut().push(e.clone());
6653 }
6654 }));
6655 }
6656
6657 cx.update(|cx| {
6658 cx.emit_global(GlobalEvent(1));
6659 cx.emit_global(GlobalEvent(2));
6660 });
6661
6662 assert_eq!(*events.borrow(), [GlobalEvent(1)]);
6663
6664 // Model Observation
6665 let observing_model = cx.add_model(|_| Model);
6666 let observed_model = cx.add_model(|_| Model);
6667
6668 let observation_count = Rc::new(RefCell::new(0));
6669
6670 observing_model.update(cx, |_, cx| {
6671 let observation_count = observation_count.clone();
6672 let subscription = Rc::new(RefCell::new(None));
6673 *subscription.borrow_mut() = Some(cx.observe(&observed_model, {
6674 let subscription = subscription.clone();
6675 move |_, _, _| {
6676 subscription.borrow_mut().take();
6677 *observation_count.borrow_mut() += 1;
6678 }
6679 }));
6680 });
6681
6682 observed_model.update(cx, |_, cx| {
6683 cx.notify();
6684 });
6685
6686 observed_model.update(cx, |_, cx| {
6687 cx.notify();
6688 });
6689
6690 assert_eq!(*observation_count.borrow(), 1);
6691
6692 // View Observation
6693 struct View;
6694
6695 impl Entity for View {
6696 type Event = ();
6697 }
6698
6699 impl super::View for View {
6700 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
6701 Empty::new().boxed()
6702 }
6703
6704 fn ui_name() -> &'static str {
6705 "View"
6706 }
6707 }
6708
6709 let (_, root_view) = cx.add_window(Default::default(), |_| View);
6710 let observing_view = cx.add_view(&root_view, |_| View);
6711 let observed_view = cx.add_view(&root_view, |_| View);
6712
6713 let observation_count = Rc::new(RefCell::new(0));
6714 observing_view.update(cx, |_, cx| {
6715 let observation_count = observation_count.clone();
6716 let subscription = Rc::new(RefCell::new(None));
6717 *subscription.borrow_mut() = Some(cx.observe(&observed_view, {
6718 let subscription = subscription.clone();
6719 move |_, _, _| {
6720 subscription.borrow_mut().take();
6721 *observation_count.borrow_mut() += 1;
6722 }
6723 }));
6724 });
6725
6726 observed_view.update(cx, |_, cx| {
6727 cx.notify();
6728 });
6729
6730 observed_view.update(cx, |_, cx| {
6731 cx.notify();
6732 });
6733
6734 assert_eq!(*observation_count.borrow(), 1);
6735
6736 // Global Observation
6737 let observation_count = Rc::new(RefCell::new(0));
6738 let subscription = Rc::new(RefCell::new(None));
6739 *subscription.borrow_mut() = Some(cx.observe_global::<(), _>({
6740 let observation_count = observation_count.clone();
6741 let subscription = subscription.clone();
6742 move |_| {
6743 subscription.borrow_mut().take();
6744 *observation_count.borrow_mut() += 1;
6745 }
6746 }));
6747
6748 cx.default_global::<()>();
6749 cx.set_global(());
6750 assert_eq!(*observation_count.borrow(), 1);
6751 }
6752
6753 #[crate::test(self)]
6754 fn test_focus(cx: &mut MutableAppContext) {
6755 struct View {
6756 name: String,
6757 events: Arc<Mutex<Vec<String>>>,
6758 }
6759
6760 impl Entity for View {
6761 type Event = ();
6762 }
6763
6764 impl super::View for View {
6765 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
6766 Empty::new().boxed()
6767 }
6768
6769 fn ui_name() -> &'static str {
6770 "View"
6771 }
6772
6773 fn on_focus_in(&mut self, focused: AnyViewHandle, cx: &mut ViewContext<Self>) {
6774 if cx.handle().id() == focused.id() {
6775 self.events.lock().push(format!("{} focused", &self.name));
6776 }
6777 }
6778
6779 fn on_focus_out(&mut self, blurred: AnyViewHandle, cx: &mut ViewContext<Self>) {
6780 if cx.handle().id() == blurred.id() {
6781 self.events.lock().push(format!("{} blurred", &self.name));
6782 }
6783 }
6784 }
6785
6786 let view_events: Arc<Mutex<Vec<String>>> = Default::default();
6787 let (_, view_1) = cx.add_window(Default::default(), |_| View {
6788 events: view_events.clone(),
6789 name: "view 1".to_string(),
6790 });
6791 let view_2 = cx.add_view(&view_1, |_| View {
6792 events: view_events.clone(),
6793 name: "view 2".to_string(),
6794 });
6795
6796 let observed_events: Arc<Mutex<Vec<String>>> = Default::default();
6797 view_1.update(cx, |_, cx| {
6798 cx.observe_focus(&view_2, {
6799 let observed_events = observed_events.clone();
6800 move |this, view, focused, cx| {
6801 let label = if focused { "focus" } else { "blur" };
6802 observed_events.lock().push(format!(
6803 "{} observed {}'s {}",
6804 this.name,
6805 view.read(cx).name,
6806 label
6807 ))
6808 }
6809 })
6810 .detach();
6811 });
6812 view_2.update(cx, |_, cx| {
6813 cx.observe_focus(&view_1, {
6814 let observed_events = observed_events.clone();
6815 move |this, view, focused, cx| {
6816 let label = if focused { "focus" } else { "blur" };
6817 observed_events.lock().push(format!(
6818 "{} observed {}'s {}",
6819 this.name,
6820 view.read(cx).name,
6821 label
6822 ))
6823 }
6824 })
6825 .detach();
6826 });
6827 assert_eq!(mem::take(&mut *view_events.lock()), ["view 1 focused"]);
6828 assert_eq!(mem::take(&mut *observed_events.lock()), Vec::<&str>::new());
6829
6830 view_1.update(cx, |_, cx| {
6831 // Ensure only the latest focus is honored.
6832 cx.focus(&view_2);
6833 cx.focus(&view_1);
6834 cx.focus(&view_2);
6835 });
6836 assert_eq!(
6837 mem::take(&mut *view_events.lock()),
6838 ["view 1 blurred", "view 2 focused"],
6839 );
6840 assert_eq!(
6841 mem::take(&mut *observed_events.lock()),
6842 [
6843 "view 2 observed view 1's blur",
6844 "view 1 observed view 2's focus"
6845 ]
6846 );
6847
6848 view_1.update(cx, |_, cx| cx.focus(&view_1));
6849 assert_eq!(
6850 mem::take(&mut *view_events.lock()),
6851 ["view 2 blurred", "view 1 focused"],
6852 );
6853 assert_eq!(
6854 mem::take(&mut *observed_events.lock()),
6855 [
6856 "view 1 observed view 2's blur",
6857 "view 2 observed view 1's focus"
6858 ]
6859 );
6860
6861 view_1.update(cx, |_, cx| cx.focus(&view_2));
6862 assert_eq!(
6863 mem::take(&mut *view_events.lock()),
6864 ["view 1 blurred", "view 2 focused"],
6865 );
6866 assert_eq!(
6867 mem::take(&mut *observed_events.lock()),
6868 [
6869 "view 2 observed view 1's blur",
6870 "view 1 observed view 2's focus"
6871 ]
6872 );
6873
6874 view_1.update(cx, |_, _| drop(view_2));
6875 assert_eq!(mem::take(&mut *view_events.lock()), ["view 1 focused"]);
6876 assert_eq!(mem::take(&mut *observed_events.lock()), Vec::<&str>::new());
6877 }
6878
6879 #[crate::test(self)]
6880 fn test_deserialize_actions(cx: &mut MutableAppContext) {
6881 #[derive(Clone, Debug, Deserialize, PartialEq, Eq)]
6882 pub struct ComplexAction {
6883 arg: String,
6884 count: usize,
6885 }
6886
6887 actions!(test::something, [SimpleAction]);
6888 impl_actions!(test::something, [ComplexAction]);
6889
6890 cx.add_global_action(move |_: &SimpleAction, _: &mut MutableAppContext| {});
6891 cx.add_global_action(move |_: &ComplexAction, _: &mut MutableAppContext| {});
6892
6893 let action1 = cx
6894 .deserialize_action(
6895 "test::something::ComplexAction",
6896 Some(r#"{"arg": "a", "count": 5}"#),
6897 )
6898 .unwrap();
6899 let action2 = cx
6900 .deserialize_action("test::something::SimpleAction", None)
6901 .unwrap();
6902 assert_eq!(
6903 action1.as_any().downcast_ref::<ComplexAction>().unwrap(),
6904 &ComplexAction {
6905 arg: "a".to_string(),
6906 count: 5,
6907 }
6908 );
6909 assert_eq!(
6910 action2.as_any().downcast_ref::<SimpleAction>().unwrap(),
6911 &SimpleAction
6912 );
6913 }
6914
6915 #[crate::test(self)]
6916 fn test_dispatch_action(cx: &mut MutableAppContext) {
6917 struct ViewA {
6918 id: usize,
6919 }
6920
6921 impl Entity for ViewA {
6922 type Event = ();
6923 }
6924
6925 impl View for ViewA {
6926 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
6927 Empty::new().boxed()
6928 }
6929
6930 fn ui_name() -> &'static str {
6931 "View"
6932 }
6933 }
6934
6935 struct ViewB {
6936 id: usize,
6937 }
6938
6939 impl Entity for ViewB {
6940 type Event = ();
6941 }
6942
6943 impl View for ViewB {
6944 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
6945 Empty::new().boxed()
6946 }
6947
6948 fn ui_name() -> &'static str {
6949 "View"
6950 }
6951 }
6952
6953 #[derive(Clone, Default, Deserialize, PartialEq)]
6954 pub struct Action(pub String);
6955
6956 impl_actions!(test, [Action]);
6957
6958 let actions = Rc::new(RefCell::new(Vec::new()));
6959
6960 cx.add_global_action({
6961 let actions = actions.clone();
6962 move |_: &Action, _: &mut MutableAppContext| {
6963 actions.borrow_mut().push("global".to_string());
6964 }
6965 });
6966
6967 cx.add_action({
6968 let actions = actions.clone();
6969 move |view: &mut ViewA, action: &Action, cx| {
6970 assert_eq!(action.0, "bar");
6971 cx.propagate_action();
6972 actions.borrow_mut().push(format!("{} a", view.id));
6973 }
6974 });
6975
6976 cx.add_action({
6977 let actions = actions.clone();
6978 move |view: &mut ViewA, _: &Action, cx| {
6979 if view.id != 1 {
6980 cx.add_view(|cx| {
6981 cx.propagate_action(); // Still works on a nested ViewContext
6982 ViewB { id: 5 }
6983 });
6984 }
6985 actions.borrow_mut().push(format!("{} b", view.id));
6986 }
6987 });
6988
6989 cx.add_action({
6990 let actions = actions.clone();
6991 move |view: &mut ViewB, _: &Action, cx| {
6992 cx.propagate_action();
6993 actions.borrow_mut().push(format!("{} c", view.id));
6994 }
6995 });
6996
6997 cx.add_action({
6998 let actions = actions.clone();
6999 move |view: &mut ViewB, _: &Action, cx| {
7000 cx.propagate_action();
7001 actions.borrow_mut().push(format!("{} d", view.id));
7002 }
7003 });
7004
7005 cx.capture_action({
7006 let actions = actions.clone();
7007 move |view: &mut ViewA, _: &Action, cx| {
7008 cx.propagate_action();
7009 actions.borrow_mut().push(format!("{} capture", view.id));
7010 }
7011 });
7012
7013 let observed_actions = Rc::new(RefCell::new(Vec::new()));
7014 cx.observe_actions({
7015 let observed_actions = observed_actions.clone();
7016 move |action_id, _| observed_actions.borrow_mut().push(action_id)
7017 })
7018 .detach();
7019
7020 let (window_id, view_1) = cx.add_window(Default::default(), |_| ViewA { id: 1 });
7021 let view_2 = cx.add_view(&view_1, |_| ViewB { id: 2 });
7022 let view_3 = cx.add_view(&view_2, |_| ViewA { id: 3 });
7023 let view_4 = cx.add_view(&view_3, |_| ViewB { id: 4 });
7024
7025 cx.handle_dispatch_action_from_effect(
7026 window_id,
7027 Some(view_4.id()),
7028 &Action("bar".to_string()),
7029 );
7030
7031 assert_eq!(
7032 *actions.borrow(),
7033 vec![
7034 "1 capture",
7035 "3 capture",
7036 "4 d",
7037 "4 c",
7038 "3 b",
7039 "3 a",
7040 "2 d",
7041 "2 c",
7042 "1 b"
7043 ]
7044 );
7045 assert_eq!(*observed_actions.borrow(), [Action::default().id()]);
7046
7047 // Remove view_1, which doesn't propagate the action
7048
7049 let (window_id, view_2) = cx.add_window(Default::default(), |_| ViewB { id: 2 });
7050 let view_3 = cx.add_view(&view_2, |_| ViewA { id: 3 });
7051 let view_4 = cx.add_view(&view_3, |_| ViewB { id: 4 });
7052
7053 actions.borrow_mut().clear();
7054 cx.handle_dispatch_action_from_effect(
7055 window_id,
7056 Some(view_4.id()),
7057 &Action("bar".to_string()),
7058 );
7059
7060 assert_eq!(
7061 *actions.borrow(),
7062 vec![
7063 "3 capture",
7064 "4 d",
7065 "4 c",
7066 "3 b",
7067 "3 a",
7068 "2 d",
7069 "2 c",
7070 "global"
7071 ]
7072 );
7073 assert_eq!(
7074 *observed_actions.borrow(),
7075 [Action::default().id(), Action::default().id()]
7076 );
7077 }
7078
7079 #[crate::test(self)]
7080 fn test_dispatch_keystroke(cx: &mut MutableAppContext) {
7081 #[derive(Clone, Deserialize, PartialEq)]
7082 pub struct Action(String);
7083
7084 impl_actions!(test, [Action]);
7085
7086 struct View {
7087 id: usize,
7088 keymap_context: keymap::Context,
7089 }
7090
7091 impl Entity for View {
7092 type Event = ();
7093 }
7094
7095 impl super::View for View {
7096 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
7097 Empty::new().boxed()
7098 }
7099
7100 fn ui_name() -> &'static str {
7101 "View"
7102 }
7103
7104 fn keymap_context(&self, _: &AppContext) -> keymap::Context {
7105 self.keymap_context.clone()
7106 }
7107 }
7108
7109 impl View {
7110 fn new(id: usize) -> Self {
7111 View {
7112 id,
7113 keymap_context: keymap::Context::default(),
7114 }
7115 }
7116 }
7117
7118 let mut view_1 = View::new(1);
7119 let mut view_2 = View::new(2);
7120 let mut view_3 = View::new(3);
7121 view_1.keymap_context.set.insert("a".into());
7122 view_2.keymap_context.set.insert("a".into());
7123 view_2.keymap_context.set.insert("b".into());
7124 view_3.keymap_context.set.insert("a".into());
7125 view_3.keymap_context.set.insert("b".into());
7126 view_3.keymap_context.set.insert("c".into());
7127
7128 let (window_id, view_1) = cx.add_window(Default::default(), |_| view_1);
7129 let view_2 = cx.add_view(&view_1, |_| view_2);
7130 let _view_3 = cx.add_view(&view_2, |cx| {
7131 cx.focus_self();
7132 view_3
7133 });
7134
7135 // This keymap's only binding dispatches an action on view 2 because that view will have
7136 // "a" and "b" in its context, but not "c".
7137 cx.add_bindings(vec![keymap::Binding::new(
7138 "a",
7139 Action("a".to_string()),
7140 Some("a && b && !c"),
7141 )]);
7142
7143 cx.add_bindings(vec![keymap::Binding::new(
7144 "b",
7145 Action("b".to_string()),
7146 None,
7147 )]);
7148
7149 let actions = Rc::new(RefCell::new(Vec::new()));
7150 cx.add_action({
7151 let actions = actions.clone();
7152 move |view: &mut View, action: &Action, cx| {
7153 if action.0 == "a" {
7154 actions.borrow_mut().push(format!("{} a", view.id));
7155 } else {
7156 actions
7157 .borrow_mut()
7158 .push(format!("{} {}", view.id, action.0));
7159 cx.propagate_action();
7160 }
7161 }
7162 });
7163
7164 cx.add_global_action({
7165 let actions = actions.clone();
7166 move |action: &Action, _| {
7167 actions.borrow_mut().push(format!("global {}", action.0));
7168 }
7169 });
7170
7171 cx.dispatch_keystroke(window_id, &Keystroke::parse("a").unwrap());
7172
7173 assert_eq!(&*actions.borrow(), &["2 a"]);
7174
7175 actions.borrow_mut().clear();
7176
7177 cx.dispatch_keystroke(window_id, &Keystroke::parse("b").unwrap());
7178
7179 assert_eq!(&*actions.borrow(), &["3 b", "2 b", "1 b", "global b"]);
7180 }
7181
7182 #[crate::test(self)]
7183 async fn test_model_condition(cx: &mut TestAppContext) {
7184 struct Counter(usize);
7185
7186 impl super::Entity for Counter {
7187 type Event = ();
7188 }
7189
7190 impl Counter {
7191 fn inc(&mut self, cx: &mut ModelContext<Self>) {
7192 self.0 += 1;
7193 cx.notify();
7194 }
7195 }
7196
7197 let model = cx.add_model(|_| Counter(0));
7198
7199 let condition1 = model.condition(cx, |model, _| model.0 == 2);
7200 let condition2 = model.condition(cx, |model, _| model.0 == 3);
7201 smol::pin!(condition1, condition2);
7202
7203 model.update(cx, |model, cx| model.inc(cx));
7204 assert_eq!(poll_once(&mut condition1).await, None);
7205 assert_eq!(poll_once(&mut condition2).await, None);
7206
7207 model.update(cx, |model, cx| model.inc(cx));
7208 assert_eq!(poll_once(&mut condition1).await, Some(()));
7209 assert_eq!(poll_once(&mut condition2).await, None);
7210
7211 model.update(cx, |model, cx| model.inc(cx));
7212 assert_eq!(poll_once(&mut condition2).await, Some(()));
7213
7214 model.update(cx, |_, cx| cx.notify());
7215 }
7216
7217 #[crate::test(self)]
7218 #[should_panic]
7219 async fn test_model_condition_timeout(cx: &mut TestAppContext) {
7220 struct Model;
7221
7222 impl super::Entity for Model {
7223 type Event = ();
7224 }
7225
7226 let model = cx.add_model(|_| Model);
7227 model.condition(cx, |_, _| false).await;
7228 }
7229
7230 #[crate::test(self)]
7231 #[should_panic(expected = "model dropped with pending condition")]
7232 async fn test_model_condition_panic_on_drop(cx: &mut TestAppContext) {
7233 struct Model;
7234
7235 impl super::Entity for Model {
7236 type Event = ();
7237 }
7238
7239 let model = cx.add_model(|_| Model);
7240 let condition = model.condition(cx, |_, _| false);
7241 cx.update(|_| drop(model));
7242 condition.await;
7243 }
7244
7245 #[crate::test(self)]
7246 async fn test_view_condition(cx: &mut TestAppContext) {
7247 struct Counter(usize);
7248
7249 impl super::Entity for Counter {
7250 type Event = ();
7251 }
7252
7253 impl super::View for Counter {
7254 fn ui_name() -> &'static str {
7255 "test view"
7256 }
7257
7258 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
7259 Empty::new().boxed()
7260 }
7261 }
7262
7263 impl Counter {
7264 fn inc(&mut self, cx: &mut ViewContext<Self>) {
7265 self.0 += 1;
7266 cx.notify();
7267 }
7268 }
7269
7270 let (_, view) = cx.add_window(|_| Counter(0));
7271
7272 let condition1 = view.condition(cx, |view, _| view.0 == 2);
7273 let condition2 = view.condition(cx, |view, _| view.0 == 3);
7274 smol::pin!(condition1, condition2);
7275
7276 view.update(cx, |view, cx| view.inc(cx));
7277 assert_eq!(poll_once(&mut condition1).await, None);
7278 assert_eq!(poll_once(&mut condition2).await, None);
7279
7280 view.update(cx, |view, cx| view.inc(cx));
7281 assert_eq!(poll_once(&mut condition1).await, Some(()));
7282 assert_eq!(poll_once(&mut condition2).await, None);
7283
7284 view.update(cx, |view, cx| view.inc(cx));
7285 assert_eq!(poll_once(&mut condition2).await, Some(()));
7286 view.update(cx, |_, cx| cx.notify());
7287 }
7288
7289 #[crate::test(self)]
7290 #[should_panic]
7291 async fn test_view_condition_timeout(cx: &mut TestAppContext) {
7292 struct View;
7293
7294 impl super::Entity for View {
7295 type Event = ();
7296 }
7297
7298 impl super::View for View {
7299 fn ui_name() -> &'static str {
7300 "test view"
7301 }
7302
7303 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
7304 Empty::new().boxed()
7305 }
7306 }
7307
7308 let (_, view) = cx.add_window(|_| View);
7309 view.condition(cx, |_, _| false).await;
7310 }
7311
7312 #[crate::test(self)]
7313 #[should_panic(expected = "view dropped with pending condition")]
7314 async fn test_view_condition_panic_on_drop(cx: &mut TestAppContext) {
7315 struct View;
7316
7317 impl super::Entity for View {
7318 type Event = ();
7319 }
7320
7321 impl super::View for View {
7322 fn ui_name() -> &'static str {
7323 "test view"
7324 }
7325
7326 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
7327 Empty::new().boxed()
7328 }
7329 }
7330
7331 let (_, root_view) = cx.add_window(|_| View);
7332 let view = cx.add_view(&root_view, |_| View);
7333
7334 let condition = view.condition(cx, |_, _| false);
7335 cx.update(|_| drop(view));
7336 condition.await;
7337 }
7338
7339 #[crate::test(self)]
7340 fn test_refresh_windows(cx: &mut MutableAppContext) {
7341 struct View(usize);
7342
7343 impl super::Entity for View {
7344 type Event = ();
7345 }
7346
7347 impl super::View for View {
7348 fn ui_name() -> &'static str {
7349 "test view"
7350 }
7351
7352 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
7353 Empty::new().named(format!("render count: {}", post_inc(&mut self.0)))
7354 }
7355 }
7356
7357 let (window_id, root_view) = cx.add_window(Default::default(), |_| View(0));
7358 let presenter = cx.presenters_and_platform_windows[&window_id].0.clone();
7359
7360 assert_eq!(
7361 presenter.borrow().rendered_views[&root_view.id()].name(),
7362 Some("render count: 0")
7363 );
7364
7365 let view = cx.add_view(&root_view, |cx| {
7366 cx.refresh_windows();
7367 View(0)
7368 });
7369
7370 assert_eq!(
7371 presenter.borrow().rendered_views[&root_view.id()].name(),
7372 Some("render count: 1")
7373 );
7374 assert_eq!(
7375 presenter.borrow().rendered_views[&view.id()].name(),
7376 Some("render count: 0")
7377 );
7378
7379 cx.update(|cx| cx.refresh_windows());
7380 assert_eq!(
7381 presenter.borrow().rendered_views[&root_view.id()].name(),
7382 Some("render count: 2")
7383 );
7384 assert_eq!(
7385 presenter.borrow().rendered_views[&view.id()].name(),
7386 Some("render count: 1")
7387 );
7388
7389 cx.update(|cx| {
7390 cx.refresh_windows();
7391 drop(view);
7392 });
7393 assert_eq!(
7394 presenter.borrow().rendered_views[&root_view.id()].name(),
7395 Some("render count: 3")
7396 );
7397 assert_eq!(presenter.borrow().rendered_views.len(), 1);
7398 }
7399
7400 #[crate::test(self)]
7401 async fn test_window_activation(cx: &mut TestAppContext) {
7402 struct View(&'static str);
7403
7404 impl super::Entity for View {
7405 type Event = ();
7406 }
7407
7408 impl super::View for View {
7409 fn ui_name() -> &'static str {
7410 "test view"
7411 }
7412
7413 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
7414 Empty::new().boxed()
7415 }
7416 }
7417
7418 let events = Rc::new(RefCell::new(Vec::new()));
7419 let (window_1, _) = cx.add_window(|cx: &mut ViewContext<View>| {
7420 cx.observe_window_activation({
7421 let events = events.clone();
7422 move |this, active, _| events.borrow_mut().push((this.0, active))
7423 })
7424 .detach();
7425 View("window 1")
7426 });
7427 assert_eq!(mem::take(&mut *events.borrow_mut()), [("window 1", true)]);
7428
7429 let (window_2, _) = cx.add_window(|cx: &mut ViewContext<View>| {
7430 cx.observe_window_activation({
7431 let events = events.clone();
7432 move |this, active, _| events.borrow_mut().push((this.0, active))
7433 })
7434 .detach();
7435 View("window 2")
7436 });
7437 assert_eq!(
7438 mem::take(&mut *events.borrow_mut()),
7439 [("window 1", false), ("window 2", true)]
7440 );
7441
7442 let (window_3, _) = cx.add_window(|cx: &mut ViewContext<View>| {
7443 cx.observe_window_activation({
7444 let events = events.clone();
7445 move |this, active, _| events.borrow_mut().push((this.0, active))
7446 })
7447 .detach();
7448 View("window 3")
7449 });
7450 assert_eq!(
7451 mem::take(&mut *events.borrow_mut()),
7452 [("window 2", false), ("window 3", true)]
7453 );
7454
7455 cx.simulate_window_activation(Some(window_2));
7456 assert_eq!(
7457 mem::take(&mut *events.borrow_mut()),
7458 [("window 3", false), ("window 2", true)]
7459 );
7460
7461 cx.simulate_window_activation(Some(window_1));
7462 assert_eq!(
7463 mem::take(&mut *events.borrow_mut()),
7464 [("window 2", false), ("window 1", true)]
7465 );
7466
7467 cx.simulate_window_activation(Some(window_3));
7468 assert_eq!(
7469 mem::take(&mut *events.borrow_mut()),
7470 [("window 1", false), ("window 3", true)]
7471 );
7472
7473 cx.simulate_window_activation(Some(window_3));
7474 assert_eq!(mem::take(&mut *events.borrow_mut()), []);
7475 }
7476}