1use crate::{
2 elements::ElementBox,
3 executor,
4 keymap::{self, Keystroke},
5 platform::{self, CursorStyle, Platform, PromptLevel, WindowOptions},
6 presenter::Presenter,
7 util::{post_inc, timeout},
8 AssetCache, AssetSource, ClipboardItem, FontCache, PathPromptOptions, TextLayoutCache,
9};
10use anyhow::{anyhow, Result};
11use async_task::Task;
12use keymap::MatchResult;
13use parking_lot::Mutex;
14use platform::Event;
15use postage::{mpsc, sink::Sink as _, stream::Stream as _};
16use smol::prelude::*;
17use std::{
18 any::{type_name, Any, TypeId},
19 cell::RefCell,
20 collections::{hash_map::Entry, BTreeMap, HashMap, HashSet, VecDeque},
21 fmt::{self, Debug},
22 hash::{Hash, Hasher},
23 marker::PhantomData,
24 mem,
25 ops::{Deref, DerefMut},
26 path::{Path, PathBuf},
27 rc::{self, Rc},
28 sync::{
29 atomic::{AtomicUsize, Ordering::SeqCst},
30 Arc, Weak,
31 },
32 time::Duration,
33};
34
35pub trait Entity: 'static {
36 type Event;
37
38 fn release(&mut self, _: &mut MutableAppContext) {}
39}
40
41pub trait View: Entity + Sized {
42 fn ui_name() -> &'static str;
43 fn render(&mut self, cx: &mut RenderContext<'_, Self>) -> ElementBox;
44 fn on_focus(&mut self, _: &mut ViewContext<Self>) {}
45 fn on_blur(&mut self, _: &mut ViewContext<Self>) {}
46 fn keymap_context(&self, _: &AppContext) -> keymap::Context {
47 Self::default_keymap_context()
48 }
49 fn default_keymap_context() -> keymap::Context {
50 let mut cx = keymap::Context::default();
51 cx.set.insert(Self::ui_name().into());
52 cx
53 }
54}
55
56pub trait ReadModel {
57 fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T;
58}
59
60pub trait ReadModelWith {
61 fn read_model_with<E: Entity, F: FnOnce(&E, &AppContext) -> T, T>(
62 &self,
63 handle: &ModelHandle<E>,
64 read: F,
65 ) -> T;
66}
67
68pub trait UpdateModel {
69 fn update_model<T, F, S>(&mut self, handle: &ModelHandle<T>, update: F) -> S
70 where
71 T: Entity,
72 F: FnOnce(&mut T, &mut ModelContext<T>) -> S;
73}
74
75pub trait UpgradeModelHandle {
76 fn upgrade_model_handle<T: Entity>(&self, handle: WeakModelHandle<T>)
77 -> Option<ModelHandle<T>>;
78}
79
80pub trait ReadView {
81 fn read_view<T: View>(&self, handle: &ViewHandle<T>) -> &T;
82}
83
84pub trait ReadViewWith {
85 fn read_view_with<V, F, T>(&self, handle: &ViewHandle<V>, read: F) -> T
86 where
87 V: View,
88 F: FnOnce(&V, &AppContext) -> T;
89}
90
91pub trait UpdateView {
92 fn update_view<T, F, S>(&mut self, handle: &ViewHandle<T>, update: F) -> S
93 where
94 T: View,
95 F: FnOnce(&mut T, &mut ViewContext<T>) -> S;
96}
97
98pub trait Action: 'static + AnyAction {
99 type Argument: 'static + Clone;
100}
101
102pub trait AnyAction {
103 fn id(&self) -> TypeId;
104 fn name(&self) -> &'static str;
105 fn as_any(&self) -> &dyn Any;
106 fn boxed_clone(&self) -> Box<dyn AnyAction>;
107 fn boxed_clone_as_any(&self) -> Box<dyn Any>;
108}
109
110#[macro_export]
111macro_rules! action {
112 ($name:ident, $arg:ty) => {
113 #[derive(Clone)]
114 pub struct $name(pub $arg);
115
116 impl $crate::Action for $name {
117 type Argument = $arg;
118 }
119
120 impl $crate::AnyAction for $name {
121 fn id(&self) -> std::any::TypeId {
122 std::any::TypeId::of::<$name>()
123 }
124
125 fn name(&self) -> &'static str {
126 stringify!($name)
127 }
128
129 fn as_any(&self) -> &dyn std::any::Any {
130 self
131 }
132
133 fn boxed_clone(&self) -> Box<dyn $crate::AnyAction> {
134 Box::new(self.clone())
135 }
136
137 fn boxed_clone_as_any(&self) -> Box<dyn std::any::Any> {
138 Box::new(self.clone())
139 }
140 }
141 };
142
143 ($name:ident) => {
144 #[derive(Clone, Debug, Eq, PartialEq)]
145 pub struct $name;
146
147 impl $crate::Action for $name {
148 type Argument = ();
149 }
150
151 impl $crate::AnyAction for $name {
152 fn id(&self) -> std::any::TypeId {
153 std::any::TypeId::of::<$name>()
154 }
155
156 fn name(&self) -> &'static str {
157 stringify!($name)
158 }
159
160 fn as_any(&self) -> &dyn std::any::Any {
161 self
162 }
163
164 fn boxed_clone(&self) -> Box<dyn $crate::AnyAction> {
165 Box::new(self.clone())
166 }
167
168 fn boxed_clone_as_any(&self) -> Box<dyn std::any::Any> {
169 Box::new(self.clone())
170 }
171 }
172 };
173}
174
175pub struct Menu<'a> {
176 pub name: &'a str,
177 pub items: Vec<MenuItem<'a>>,
178}
179
180pub enum MenuItem<'a> {
181 Action {
182 name: &'a str,
183 keystroke: Option<&'a str>,
184 action: Box<dyn AnyAction>,
185 },
186 Separator,
187}
188
189#[derive(Clone)]
190pub struct App(Rc<RefCell<MutableAppContext>>);
191
192#[derive(Clone)]
193pub struct AsyncAppContext(Rc<RefCell<MutableAppContext>>);
194
195pub struct BackgroundAppContext(*const RefCell<MutableAppContext>);
196
197#[derive(Clone)]
198pub struct TestAppContext {
199 cx: Rc<RefCell<MutableAppContext>>,
200 foreground_platform: Rc<platform::test::ForegroundPlatform>,
201}
202
203impl App {
204 pub fn new(asset_source: impl AssetSource) -> Result<Self> {
205 let platform = platform::current::platform();
206 let foreground_platform = platform::current::foreground_platform();
207 let foreground = Rc::new(executor::Foreground::platform(platform.dispatcher())?);
208 let app = Self(Rc::new(RefCell::new(MutableAppContext::new(
209 foreground,
210 Arc::new(executor::Background::new()),
211 platform.clone(),
212 foreground_platform.clone(),
213 Arc::new(FontCache::new(platform.fonts())),
214 asset_source,
215 ))));
216
217 let cx = app.0.clone();
218 foreground_platform.on_menu_command(Box::new(move |action| {
219 let mut cx = cx.borrow_mut();
220 if let Some(key_window_id) = cx.cx.platform.key_window_id() {
221 if let Some((presenter, _)) = cx.presenters_and_platform_windows.get(&key_window_id)
222 {
223 let presenter = presenter.clone();
224 let path = presenter.borrow().dispatch_path(cx.as_ref());
225 cx.dispatch_action_any(key_window_id, &path, action);
226 } else {
227 cx.dispatch_global_action_any(action);
228 }
229 } else {
230 cx.dispatch_global_action_any(action);
231 }
232 }));
233
234 app.0.borrow_mut().weak_self = Some(Rc::downgrade(&app.0));
235 Ok(app)
236 }
237
238 pub fn on_become_active<F>(self, mut callback: F) -> Self
239 where
240 F: 'static + FnMut(&mut MutableAppContext),
241 {
242 let cx = self.0.clone();
243 self.0
244 .borrow_mut()
245 .foreground_platform
246 .on_become_active(Box::new(move || callback(&mut *cx.borrow_mut())));
247 self
248 }
249
250 pub fn on_resign_active<F>(self, mut callback: F) -> Self
251 where
252 F: 'static + FnMut(&mut MutableAppContext),
253 {
254 let cx = self.0.clone();
255 self.0
256 .borrow_mut()
257 .foreground_platform
258 .on_resign_active(Box::new(move || callback(&mut *cx.borrow_mut())));
259 self
260 }
261
262 pub fn on_event<F>(self, mut callback: F) -> Self
263 where
264 F: 'static + FnMut(Event, &mut MutableAppContext) -> bool,
265 {
266 let cx = self.0.clone();
267 self.0
268 .borrow_mut()
269 .foreground_platform
270 .on_event(Box::new(move |event| {
271 callback(event, &mut *cx.borrow_mut())
272 }));
273 self
274 }
275
276 pub fn on_open_files<F>(self, mut callback: F) -> Self
277 where
278 F: 'static + FnMut(Vec<PathBuf>, &mut MutableAppContext),
279 {
280 let cx = self.0.clone();
281 self.0
282 .borrow_mut()
283 .foreground_platform
284 .on_open_files(Box::new(move |paths| {
285 callback(paths, &mut *cx.borrow_mut())
286 }));
287 self
288 }
289
290 pub fn run<F>(self, on_finish_launching: F)
291 where
292 F: 'static + FnOnce(&mut MutableAppContext),
293 {
294 let platform = self.0.borrow().foreground_platform.clone();
295 platform.run(Box::new(move || {
296 let mut cx = self.0.borrow_mut();
297 let cx = &mut *cx;
298 crate::views::init(cx);
299 on_finish_launching(cx);
300 }))
301 }
302
303 pub fn platform(&self) -> Arc<dyn Platform> {
304 self.0.borrow().platform()
305 }
306
307 pub fn font_cache(&self) -> Arc<FontCache> {
308 self.0.borrow().cx.font_cache.clone()
309 }
310
311 fn update<T, F: FnOnce(&mut MutableAppContext) -> T>(&mut self, callback: F) -> T {
312 let mut state = self.0.borrow_mut();
313 state.pending_flushes += 1;
314 let result = callback(&mut *state);
315 state.flush_effects();
316 result
317 }
318}
319
320impl TestAppContext {
321 pub fn new(
322 foreground_platform: Rc<platform::test::ForegroundPlatform>,
323 platform: Arc<dyn Platform>,
324 foreground: Rc<executor::Foreground>,
325 background: Arc<executor::Background>,
326 font_cache: Arc<FontCache>,
327 first_entity_id: usize,
328 ) -> Self {
329 let mut cx = MutableAppContext::new(
330 foreground.clone(),
331 background,
332 platform,
333 foreground_platform.clone(),
334 font_cache,
335 (),
336 );
337 cx.next_entity_id = first_entity_id;
338 let cx = TestAppContext {
339 cx: Rc::new(RefCell::new(cx)),
340 foreground_platform,
341 };
342 cx.cx.borrow_mut().weak_self = Some(Rc::downgrade(&cx.cx));
343 cx
344 }
345
346 pub fn dispatch_action<A: Action>(
347 &self,
348 window_id: usize,
349 responder_chain: Vec<usize>,
350 action: A,
351 ) {
352 self.cx
353 .borrow_mut()
354 .dispatch_action_any(window_id, &responder_chain, &action);
355 }
356
357 pub fn dispatch_global_action<A: Action>(&self, action: A) {
358 self.cx.borrow_mut().dispatch_global_action(action);
359 }
360
361 pub fn dispatch_keystroke(
362 &self,
363 window_id: usize,
364 responder_chain: Vec<usize>,
365 keystroke: &Keystroke,
366 ) -> Result<bool> {
367 let mut state = self.cx.borrow_mut();
368 state.dispatch_keystroke(window_id, responder_chain, keystroke)
369 }
370
371 pub fn add_model<T, F>(&mut self, build_model: F) -> ModelHandle<T>
372 where
373 T: Entity,
374 F: FnOnce(&mut ModelContext<T>) -> T,
375 {
376 let mut state = self.cx.borrow_mut();
377 state.pending_flushes += 1;
378 let handle = state.add_model(build_model);
379 state.flush_effects();
380 handle
381 }
382
383 pub fn add_window<T, F>(&mut self, build_root_view: F) -> (usize, ViewHandle<T>)
384 where
385 T: View,
386 F: FnOnce(&mut ViewContext<T>) -> T,
387 {
388 self.cx
389 .borrow_mut()
390 .add_window(Default::default(), build_root_view)
391 }
392
393 pub fn window_ids(&self) -> Vec<usize> {
394 self.cx.borrow().window_ids().collect()
395 }
396
397 pub fn root_view<T: View>(&self, window_id: usize) -> Option<ViewHandle<T>> {
398 self.cx.borrow().root_view(window_id)
399 }
400
401 pub fn add_view<T, F>(&mut self, window_id: usize, build_view: F) -> ViewHandle<T>
402 where
403 T: View,
404 F: FnOnce(&mut ViewContext<T>) -> T,
405 {
406 let mut state = self.cx.borrow_mut();
407 state.pending_flushes += 1;
408 let handle = state.add_view(window_id, build_view);
409 state.flush_effects();
410 handle
411 }
412
413 pub fn add_option_view<T, F>(
414 &mut self,
415 window_id: usize,
416 build_view: F,
417 ) -> Option<ViewHandle<T>>
418 where
419 T: View,
420 F: FnOnce(&mut ViewContext<T>) -> Option<T>,
421 {
422 let mut state = self.cx.borrow_mut();
423 state.pending_flushes += 1;
424 let handle = state.add_option_view(window_id, build_view);
425 state.flush_effects();
426 handle
427 }
428
429 pub fn read<T, F: FnOnce(&AppContext) -> T>(&self, callback: F) -> T {
430 callback(self.cx.borrow().as_ref())
431 }
432
433 pub fn update<T, F: FnOnce(&mut MutableAppContext) -> T>(&mut self, callback: F) -> T {
434 let mut state = self.cx.borrow_mut();
435 // Don't increment pending flushes in order to effects to be flushed before the callback
436 // completes, which is helpful in tests.
437 let result = callback(&mut *state);
438 // Flush effects after the callback just in case there are any. This can happen in edge
439 // cases such as the closure dropping handles.
440 state.flush_effects();
441 result
442 }
443
444 pub fn to_async(&self) -> AsyncAppContext {
445 AsyncAppContext(self.cx.clone())
446 }
447
448 pub fn font_cache(&self) -> Arc<FontCache> {
449 self.cx.borrow().cx.font_cache.clone()
450 }
451
452 pub fn platform(&self) -> Arc<dyn platform::Platform> {
453 self.cx.borrow().cx.platform.clone()
454 }
455
456 pub fn foreground(&self) -> Rc<executor::Foreground> {
457 self.cx.borrow().foreground().clone()
458 }
459
460 pub fn background(&self) -> Arc<executor::Background> {
461 self.cx.borrow().background().clone()
462 }
463
464 pub fn simulate_new_path_selection(&self, result: impl FnOnce(PathBuf) -> Option<PathBuf>) {
465 self.foreground_platform.simulate_new_path_selection(result);
466 }
467
468 pub fn did_prompt_for_new_path(&self) -> bool {
469 self.foreground_platform.as_ref().did_prompt_for_new_path()
470 }
471
472 pub fn simulate_prompt_answer(&self, window_id: usize, answer: usize) {
473 let mut state = self.cx.borrow_mut();
474 let (_, window) = state
475 .presenters_and_platform_windows
476 .get_mut(&window_id)
477 .unwrap();
478 let test_window = window
479 .as_any_mut()
480 .downcast_mut::<platform::test::Window>()
481 .unwrap();
482 let callback = test_window
483 .last_prompt
484 .take()
485 .expect("prompt was not called");
486 (callback)(answer);
487 }
488}
489
490impl AsyncAppContext {
491 pub fn spawn<F, Fut, T>(&self, f: F) -> Task<T>
492 where
493 F: FnOnce(AsyncAppContext) -> Fut,
494 Fut: 'static + Future<Output = T>,
495 T: 'static,
496 {
497 self.0.borrow().foreground.spawn(f(self.clone()))
498 }
499
500 pub fn read<T, F: FnOnce(&AppContext) -> T>(&mut self, callback: F) -> T {
501 callback(self.0.borrow().as_ref())
502 }
503
504 pub fn update<T, F: FnOnce(&mut MutableAppContext) -> T>(&mut self, callback: F) -> T {
505 let mut state = self.0.borrow_mut();
506 state.pending_flushes += 1;
507 let result = callback(&mut *state);
508 state.flush_effects();
509 result
510 }
511
512 pub fn add_model<T, F>(&mut self, build_model: F) -> ModelHandle<T>
513 where
514 T: Entity,
515 F: FnOnce(&mut ModelContext<T>) -> T,
516 {
517 self.update(|cx| cx.add_model(build_model))
518 }
519
520 pub fn platform(&self) -> Arc<dyn Platform> {
521 self.0.borrow().platform()
522 }
523
524 pub fn foreground(&self) -> Rc<executor::Foreground> {
525 self.0.borrow().foreground.clone()
526 }
527
528 pub fn background(&self) -> Arc<executor::Background> {
529 self.0.borrow().cx.background.clone()
530 }
531}
532
533impl UpdateModel for AsyncAppContext {
534 fn update_model<T, F, S>(&mut self, handle: &ModelHandle<T>, update: F) -> S
535 where
536 T: Entity,
537 F: FnOnce(&mut T, &mut ModelContext<T>) -> S,
538 {
539 let mut state = self.0.borrow_mut();
540 state.pending_flushes += 1;
541 let result = state.update_model(handle, update);
542 state.flush_effects();
543 result
544 }
545}
546
547impl UpgradeModelHandle for AsyncAppContext {
548 fn upgrade_model_handle<T: Entity>(
549 &self,
550 handle: WeakModelHandle<T>,
551 ) -> Option<ModelHandle<T>> {
552 self.0.borrow_mut().upgrade_model_handle(handle)
553 }
554}
555
556impl ReadModelWith for AsyncAppContext {
557 fn read_model_with<E: Entity, F: FnOnce(&E, &AppContext) -> T, T>(
558 &self,
559 handle: &ModelHandle<E>,
560 read: F,
561 ) -> T {
562 let cx = self.0.borrow();
563 let cx = cx.as_ref();
564 read(handle.read(cx), cx)
565 }
566}
567
568impl UpdateView for AsyncAppContext {
569 fn update_view<T, F, S>(&mut self, handle: &ViewHandle<T>, update: F) -> S
570 where
571 T: View,
572 F: FnOnce(&mut T, &mut ViewContext<T>) -> S,
573 {
574 let mut state = self.0.borrow_mut();
575 state.pending_flushes += 1;
576 let result = state.update_view(handle, update);
577 state.flush_effects();
578 result
579 }
580}
581
582impl ReadViewWith for AsyncAppContext {
583 fn read_view_with<V, F, T>(&self, handle: &ViewHandle<V>, read: F) -> T
584 where
585 V: View,
586 F: FnOnce(&V, &AppContext) -> T,
587 {
588 let cx = self.0.borrow();
589 let cx = cx.as_ref();
590 read(handle.read(cx), cx)
591 }
592}
593
594impl UpdateModel for TestAppContext {
595 fn update_model<T, F, S>(&mut self, handle: &ModelHandle<T>, update: F) -> S
596 where
597 T: Entity,
598 F: FnOnce(&mut T, &mut ModelContext<T>) -> S,
599 {
600 let mut state = self.cx.borrow_mut();
601 state.pending_flushes += 1;
602 let result = state.update_model(handle, update);
603 state.flush_effects();
604 result
605 }
606}
607
608impl ReadModelWith for TestAppContext {
609 fn read_model_with<E: Entity, F: FnOnce(&E, &AppContext) -> T, T>(
610 &self,
611 handle: &ModelHandle<E>,
612 read: F,
613 ) -> T {
614 let cx = self.cx.borrow();
615 let cx = cx.as_ref();
616 read(handle.read(cx), cx)
617 }
618}
619
620impl UpdateView for TestAppContext {
621 fn update_view<T, F, S>(&mut self, handle: &ViewHandle<T>, update: F) -> S
622 where
623 T: View,
624 F: FnOnce(&mut T, &mut ViewContext<T>) -> S,
625 {
626 let mut state = self.cx.borrow_mut();
627 state.pending_flushes += 1;
628 let result = state.update_view(handle, update);
629 state.flush_effects();
630 result
631 }
632}
633
634impl ReadViewWith for TestAppContext {
635 fn read_view_with<V, F, T>(&self, handle: &ViewHandle<V>, read: F) -> T
636 where
637 V: View,
638 F: FnOnce(&V, &AppContext) -> T,
639 {
640 let cx = self.cx.borrow();
641 let cx = cx.as_ref();
642 read(handle.read(cx), cx)
643 }
644}
645
646type ActionCallback =
647 dyn FnMut(&mut dyn AnyView, &dyn AnyAction, &mut MutableAppContext, usize, usize) -> bool;
648type GlobalActionCallback = dyn FnMut(&dyn AnyAction, &mut MutableAppContext);
649
650type SubscriptionCallback = Box<dyn FnMut(&dyn Any, &mut MutableAppContext) -> bool>;
651type ObservationCallback = Box<dyn FnMut(&mut MutableAppContext) -> bool>;
652
653pub struct MutableAppContext {
654 weak_self: Option<rc::Weak<RefCell<Self>>>,
655 foreground_platform: Rc<dyn platform::ForegroundPlatform>,
656 assets: Arc<AssetCache>,
657 cx: AppContext,
658 actions: HashMap<TypeId, HashMap<TypeId, Vec<Box<ActionCallback>>>>,
659 global_actions: HashMap<TypeId, Vec<Box<GlobalActionCallback>>>,
660 keystroke_matcher: keymap::Matcher,
661 next_entity_id: usize,
662 next_window_id: usize,
663 next_subscription_id: usize,
664 subscriptions: Arc<Mutex<HashMap<usize, BTreeMap<usize, SubscriptionCallback>>>>,
665 observations: Arc<Mutex<HashMap<usize, BTreeMap<usize, ObservationCallback>>>>,
666 presenters_and_platform_windows:
667 HashMap<usize, (Rc<RefCell<Presenter>>, Box<dyn platform::Window>)>,
668 debug_elements_callbacks: HashMap<usize, Box<dyn Fn(&AppContext) -> crate::json::Value>>,
669 foreground: Rc<executor::Foreground>,
670 pending_effects: VecDeque<Effect>,
671 pending_flushes: usize,
672 flushing_effects: bool,
673 next_cursor_style_handle_id: Arc<AtomicUsize>,
674}
675
676impl MutableAppContext {
677 fn new(
678 foreground: Rc<executor::Foreground>,
679 background: Arc<executor::Background>,
680 platform: Arc<dyn platform::Platform>,
681 foreground_platform: Rc<dyn platform::ForegroundPlatform>,
682 font_cache: Arc<FontCache>,
683 asset_source: impl AssetSource,
684 ) -> Self {
685 Self {
686 weak_self: None,
687 foreground_platform,
688 assets: Arc::new(AssetCache::new(asset_source)),
689 cx: AppContext {
690 models: Default::default(),
691 views: Default::default(),
692 windows: Default::default(),
693 element_states: Default::default(),
694 ref_counts: Arc::new(Mutex::new(RefCounts::default())),
695 background,
696 font_cache,
697 platform,
698 },
699 actions: HashMap::new(),
700 global_actions: HashMap::new(),
701 keystroke_matcher: keymap::Matcher::default(),
702 next_entity_id: 0,
703 next_window_id: 0,
704 next_subscription_id: 0,
705 subscriptions: Default::default(),
706 observations: Default::default(),
707 presenters_and_platform_windows: HashMap::new(),
708 debug_elements_callbacks: HashMap::new(),
709 foreground,
710 pending_effects: VecDeque::new(),
711 pending_flushes: 0,
712 flushing_effects: false,
713 next_cursor_style_handle_id: Default::default(),
714 }
715 }
716
717 pub fn upgrade(&self) -> App {
718 App(self.weak_self.as_ref().unwrap().upgrade().unwrap())
719 }
720
721 pub fn platform(&self) -> Arc<dyn platform::Platform> {
722 self.cx.platform.clone()
723 }
724
725 pub fn font_cache(&self) -> &Arc<FontCache> {
726 &self.cx.font_cache
727 }
728
729 pub fn foreground(&self) -> &Rc<executor::Foreground> {
730 &self.foreground
731 }
732
733 pub fn background(&self) -> &Arc<executor::Background> {
734 &self.cx.background
735 }
736
737 pub fn on_debug_elements<F>(&mut self, window_id: usize, callback: F)
738 where
739 F: 'static + Fn(&AppContext) -> crate::json::Value,
740 {
741 self.debug_elements_callbacks
742 .insert(window_id, Box::new(callback));
743 }
744
745 pub fn debug_elements(&self, window_id: usize) -> Option<crate::json::Value> {
746 self.debug_elements_callbacks
747 .get(&window_id)
748 .map(|debug_elements| debug_elements(&self.cx))
749 }
750
751 pub fn add_action<A, V, F>(&mut self, mut handler: F)
752 where
753 A: Action,
754 V: View,
755 F: 'static + FnMut(&mut V, &A, &mut ViewContext<V>),
756 {
757 let handler = Box::new(
758 move |view: &mut dyn AnyView,
759 action: &dyn AnyAction,
760 cx: &mut MutableAppContext,
761 window_id: usize,
762 view_id: usize| {
763 let action = action.as_any().downcast_ref().unwrap();
764 let mut cx = ViewContext::new(cx, window_id, view_id);
765 handler(
766 view.as_any_mut()
767 .downcast_mut()
768 .expect("downcast is type safe"),
769 action,
770 &mut cx,
771 );
772 cx.halt_action_dispatch
773 },
774 );
775
776 self.actions
777 .entry(TypeId::of::<V>())
778 .or_default()
779 .entry(TypeId::of::<A>())
780 .or_default()
781 .push(handler);
782 }
783
784 pub fn add_global_action<A, F>(&mut self, mut handler: F)
785 where
786 A: Action,
787 F: 'static + FnMut(&A, &mut MutableAppContext),
788 {
789 let handler = Box::new(move |action: &dyn AnyAction, cx: &mut MutableAppContext| {
790 let action = action.as_any().downcast_ref().unwrap();
791 handler(action, cx);
792 });
793
794 self.global_actions
795 .entry(TypeId::of::<A>())
796 .or_default()
797 .push(handler);
798 }
799
800 pub fn window_ids(&self) -> impl Iterator<Item = usize> + '_ {
801 self.cx.windows.keys().cloned()
802 }
803
804 pub fn root_view<T: View>(&self, window_id: usize) -> Option<ViewHandle<T>> {
805 self.cx
806 .windows
807 .get(&window_id)
808 .and_then(|window| window.root_view.clone().downcast::<T>())
809 }
810
811 pub fn root_view_id(&self, window_id: usize) -> Option<usize> {
812 self.cx.root_view_id(window_id)
813 }
814
815 pub fn focused_view_id(&self, window_id: usize) -> Option<usize> {
816 self.cx.focused_view_id(window_id)
817 }
818
819 pub fn render_view(
820 &mut self,
821 window_id: usize,
822 view_id: usize,
823 titlebar_height: f32,
824 refreshing: bool,
825 ) -> Result<ElementBox> {
826 let mut view = self
827 .cx
828 .views
829 .remove(&(window_id, view_id))
830 .ok_or(anyhow!("view not found"))?;
831 let element = view.render(window_id, view_id, titlebar_height, refreshing, self);
832 self.cx.views.insert((window_id, view_id), view);
833 Ok(element)
834 }
835
836 pub fn render_views(
837 &mut self,
838 window_id: usize,
839 titlebar_height: f32,
840 ) -> HashMap<usize, ElementBox> {
841 let view_ids = self
842 .views
843 .keys()
844 .filter_map(|(win_id, view_id)| {
845 if *win_id == window_id {
846 Some(*view_id)
847 } else {
848 None
849 }
850 })
851 .collect::<Vec<_>>();
852 view_ids
853 .into_iter()
854 .map(|view_id| {
855 (
856 view_id,
857 self.render_view(window_id, view_id, titlebar_height, false)
858 .unwrap(),
859 )
860 })
861 .collect()
862 }
863
864 pub fn update<T, F: FnOnce() -> T>(&mut self, callback: F) -> T {
865 self.pending_flushes += 1;
866 let result = callback();
867 self.flush_effects();
868 result
869 }
870
871 pub fn set_menus(&mut self, menus: Vec<Menu>) {
872 self.foreground_platform.set_menus(menus);
873 }
874
875 fn prompt<F>(
876 &self,
877 window_id: usize,
878 level: PromptLevel,
879 msg: &str,
880 answers: &[&str],
881 done_fn: F,
882 ) where
883 F: 'static + FnOnce(usize, &mut MutableAppContext),
884 {
885 let app = self.weak_self.as_ref().unwrap().upgrade().unwrap();
886 let foreground = self.foreground.clone();
887 let (_, window) = &self.presenters_and_platform_windows[&window_id];
888 window.prompt(
889 level,
890 msg,
891 answers,
892 Box::new(move |answer| {
893 foreground
894 .spawn(async move { (done_fn)(answer, &mut *app.borrow_mut()) })
895 .detach();
896 }),
897 );
898 }
899
900 pub fn prompt_for_paths<F>(&self, options: PathPromptOptions, done_fn: F)
901 where
902 F: 'static + FnOnce(Option<Vec<PathBuf>>, &mut MutableAppContext),
903 {
904 let app = self.weak_self.as_ref().unwrap().upgrade().unwrap();
905 let foreground = self.foreground.clone();
906 self.foreground_platform.prompt_for_paths(
907 options,
908 Box::new(move |paths| {
909 foreground
910 .spawn(async move { (done_fn)(paths, &mut *app.borrow_mut()) })
911 .detach();
912 }),
913 );
914 }
915
916 pub fn prompt_for_new_path<F>(&self, directory: &Path, done_fn: F)
917 where
918 F: 'static + FnOnce(Option<PathBuf>, &mut MutableAppContext),
919 {
920 let app = self.weak_self.as_ref().unwrap().upgrade().unwrap();
921 let foreground = self.foreground.clone();
922 self.foreground_platform.prompt_for_new_path(
923 directory,
924 Box::new(move |path| {
925 foreground
926 .spawn(async move { (done_fn)(path, &mut *app.borrow_mut()) })
927 .detach();
928 }),
929 );
930 }
931
932 pub fn subscribe<E, H, F>(&mut self, handle: &H, mut callback: F) -> Subscription
933 where
934 E: Entity,
935 E::Event: 'static,
936 H: Handle<E>,
937 F: 'static + FnMut(H, &E::Event, &mut Self),
938 {
939 self.subscribe_internal(handle, move |handle, event, cx| {
940 callback(handle, event, cx);
941 true
942 })
943 }
944
945 fn observe<E, H, F>(&mut self, handle: &H, mut callback: F) -> Subscription
946 where
947 E: Entity,
948 E::Event: 'static,
949 H: Handle<E>,
950 F: 'static + FnMut(H, &mut Self),
951 {
952 self.observe_internal(handle, move |handle, cx| {
953 callback(handle, cx);
954 true
955 })
956 }
957
958 pub fn subscribe_internal<E, H, F>(&mut self, handle: &H, mut callback: F) -> Subscription
959 where
960 E: Entity,
961 E::Event: 'static,
962 H: Handle<E>,
963 F: 'static + FnMut(H, &E::Event, &mut Self) -> bool,
964 {
965 let id = post_inc(&mut self.next_subscription_id);
966 let emitter = handle.downgrade();
967 self.subscriptions
968 .lock()
969 .entry(handle.id())
970 .or_default()
971 .insert(
972 id,
973 Box::new(move |payload, cx| {
974 if let Some(emitter) = H::upgrade_from(&emitter, cx.as_ref()) {
975 let payload = payload.downcast_ref().expect("downcast is type safe");
976 callback(emitter, payload, cx)
977 } else {
978 false
979 }
980 }),
981 );
982 Subscription::Subscription {
983 id,
984 entity_id: handle.id(),
985 subscriptions: Some(Arc::downgrade(&self.subscriptions)),
986 }
987 }
988
989 fn observe_internal<E, H, F>(&mut self, handle: &H, mut callback: F) -> Subscription
990 where
991 E: Entity,
992 E::Event: 'static,
993 H: Handle<E>,
994 F: 'static + FnMut(H, &mut Self) -> bool,
995 {
996 let id = post_inc(&mut self.next_subscription_id);
997 let observed = handle.downgrade();
998 self.observations
999 .lock()
1000 .entry(handle.id())
1001 .or_default()
1002 .insert(
1003 id,
1004 Box::new(move |cx| {
1005 if let Some(observed) = H::upgrade_from(&observed, cx) {
1006 callback(observed, cx)
1007 } else {
1008 false
1009 }
1010 }),
1011 );
1012 Subscription::Observation {
1013 id,
1014 entity_id: handle.id(),
1015 observations: Some(Arc::downgrade(&self.observations)),
1016 }
1017 }
1018
1019 pub(crate) fn notify_view(&mut self, window_id: usize, view_id: usize) {
1020 self.pending_effects
1021 .push_back(Effect::ViewNotification { window_id, view_id });
1022 }
1023
1024 pub fn dispatch_action<A: Action>(
1025 &mut self,
1026 window_id: usize,
1027 responder_chain: Vec<usize>,
1028 action: &A,
1029 ) {
1030 self.dispatch_action_any(window_id, &responder_chain, action);
1031 }
1032
1033 pub(crate) fn dispatch_action_any(
1034 &mut self,
1035 window_id: usize,
1036 path: &[usize],
1037 action: &dyn AnyAction,
1038 ) -> bool {
1039 self.pending_flushes += 1;
1040 let mut halted_dispatch = false;
1041
1042 for view_id in path.iter().rev() {
1043 if let Some(mut view) = self.cx.views.remove(&(window_id, *view_id)) {
1044 let type_id = view.as_any().type_id();
1045
1046 if let Some((name, mut handlers)) = self
1047 .actions
1048 .get_mut(&type_id)
1049 .and_then(|h| h.remove_entry(&action.id()))
1050 {
1051 for handler in handlers.iter_mut().rev() {
1052 let halt_dispatch =
1053 handler(view.as_mut(), action, self, window_id, *view_id);
1054 if halt_dispatch {
1055 halted_dispatch = true;
1056 break;
1057 }
1058 }
1059 self.actions
1060 .get_mut(&type_id)
1061 .unwrap()
1062 .insert(name, handlers);
1063 }
1064
1065 self.cx.views.insert((window_id, *view_id), view);
1066
1067 if halted_dispatch {
1068 break;
1069 }
1070 }
1071 }
1072
1073 if !halted_dispatch {
1074 self.dispatch_global_action_any(action);
1075 }
1076
1077 self.flush_effects();
1078 halted_dispatch
1079 }
1080
1081 pub fn dispatch_global_action<A: Action>(&mut self, action: A) {
1082 self.dispatch_global_action_any(&action);
1083 }
1084
1085 fn dispatch_global_action_any(&mut self, action: &dyn AnyAction) {
1086 if let Some((name, mut handlers)) = self.global_actions.remove_entry(&action.id()) {
1087 self.pending_flushes += 1;
1088 for handler in handlers.iter_mut().rev() {
1089 handler(action, self);
1090 }
1091 self.global_actions.insert(name, handlers);
1092 self.flush_effects();
1093 }
1094 }
1095
1096 pub fn add_bindings<T: IntoIterator<Item = keymap::Binding>>(&mut self, bindings: T) {
1097 self.keystroke_matcher.add_bindings(bindings);
1098 }
1099
1100 pub fn dispatch_keystroke(
1101 &mut self,
1102 window_id: usize,
1103 responder_chain: Vec<usize>,
1104 keystroke: &Keystroke,
1105 ) -> Result<bool> {
1106 let mut context_chain = Vec::new();
1107 let mut context = keymap::Context::default();
1108 for view_id in &responder_chain {
1109 if let Some(view) = self.cx.views.get(&(window_id, *view_id)) {
1110 context.extend(view.keymap_context(self.as_ref()));
1111 context_chain.push(context.clone());
1112 } else {
1113 return Err(anyhow!(
1114 "View {} in responder chain does not exist",
1115 view_id
1116 ));
1117 }
1118 }
1119
1120 let mut pending = false;
1121 for (i, cx) in context_chain.iter().enumerate().rev() {
1122 match self
1123 .keystroke_matcher
1124 .push_keystroke(keystroke.clone(), responder_chain[i], cx)
1125 {
1126 MatchResult::None => {}
1127 MatchResult::Pending => pending = true,
1128 MatchResult::Action(action) => {
1129 if self.dispatch_action_any(window_id, &responder_chain[0..=i], action.as_ref())
1130 {
1131 return Ok(true);
1132 }
1133 }
1134 }
1135 }
1136
1137 Ok(pending)
1138 }
1139
1140 pub fn add_model<T, F>(&mut self, build_model: F) -> ModelHandle<T>
1141 where
1142 T: Entity,
1143 F: FnOnce(&mut ModelContext<T>) -> T,
1144 {
1145 self.pending_flushes += 1;
1146 let model_id = post_inc(&mut self.next_entity_id);
1147 let handle = ModelHandle::new(model_id, &self.cx.ref_counts);
1148 let mut cx = ModelContext::new(self, model_id);
1149 let model = build_model(&mut cx);
1150 self.cx.models.insert(model_id, Box::new(model));
1151 self.flush_effects();
1152 handle
1153 }
1154
1155 pub fn add_window<T, F>(
1156 &mut self,
1157 window_options: WindowOptions,
1158 build_root_view: F,
1159 ) -> (usize, ViewHandle<T>)
1160 where
1161 T: View,
1162 F: FnOnce(&mut ViewContext<T>) -> T,
1163 {
1164 self.pending_flushes += 1;
1165 let window_id = post_inc(&mut self.next_window_id);
1166 let root_view = self.add_view(window_id, build_root_view);
1167
1168 self.cx.windows.insert(
1169 window_id,
1170 Window {
1171 root_view: root_view.clone().into(),
1172 focused_view_id: root_view.id(),
1173 invalidation: None,
1174 },
1175 );
1176 self.open_platform_window(window_id, window_options);
1177 root_view.update(self, |view, cx| {
1178 view.on_focus(cx);
1179 cx.notify();
1180 });
1181 self.flush_effects();
1182
1183 (window_id, root_view)
1184 }
1185
1186 pub fn remove_window(&mut self, window_id: usize) {
1187 self.cx.windows.remove(&window_id);
1188 self.presenters_and_platform_windows.remove(&window_id);
1189 self.remove_dropped_entities();
1190 }
1191
1192 fn open_platform_window(&mut self, window_id: usize, window_options: WindowOptions) {
1193 let mut window =
1194 self.cx
1195 .platform
1196 .open_window(window_id, window_options, self.foreground.clone());
1197 let presenter = Rc::new(RefCell::new(
1198 self.build_presenter(window_id, window.titlebar_height()),
1199 ));
1200
1201 {
1202 let mut app = self.upgrade();
1203 let presenter = presenter.clone();
1204 window.on_event(Box::new(move |event| {
1205 app.update(|cx| {
1206 if let Event::KeyDown { keystroke, .. } = &event {
1207 if cx
1208 .dispatch_keystroke(
1209 window_id,
1210 presenter.borrow().dispatch_path(cx.as_ref()),
1211 keystroke,
1212 )
1213 .unwrap()
1214 {
1215 return;
1216 }
1217 }
1218
1219 presenter.borrow_mut().dispatch_event(event, cx);
1220 })
1221 }));
1222 }
1223
1224 {
1225 let mut app = self.upgrade();
1226 window.on_resize(Box::new(move || {
1227 app.update(|cx| cx.resize_window(window_id))
1228 }));
1229 }
1230
1231 {
1232 let mut app = self.upgrade();
1233 window.on_close(Box::new(move || {
1234 app.update(|cx| cx.remove_window(window_id));
1235 }));
1236 }
1237
1238 self.presenters_and_platform_windows
1239 .insert(window_id, (presenter.clone(), window));
1240
1241 self.on_debug_elements(window_id, move |cx| {
1242 presenter.borrow().debug_elements(cx).unwrap()
1243 });
1244 }
1245
1246 pub fn build_presenter(&mut self, window_id: usize, titlebar_height: f32) -> Presenter {
1247 Presenter::new(
1248 window_id,
1249 titlebar_height,
1250 self.cx.font_cache.clone(),
1251 TextLayoutCache::new(self.cx.platform.fonts()),
1252 self.assets.clone(),
1253 self,
1254 )
1255 }
1256
1257 pub fn build_render_context<V: View>(
1258 &mut self,
1259 window_id: usize,
1260 view_id: usize,
1261 titlebar_height: f32,
1262 refreshing: bool,
1263 ) -> RenderContext<V> {
1264 RenderContext {
1265 app: self,
1266 titlebar_height,
1267 refreshing,
1268 window_id,
1269 view_id,
1270 view_type: PhantomData,
1271 }
1272 }
1273
1274 pub fn add_view<T, F>(&mut self, window_id: usize, build_view: F) -> ViewHandle<T>
1275 where
1276 T: View,
1277 F: FnOnce(&mut ViewContext<T>) -> T,
1278 {
1279 self.add_option_view(window_id, |cx| Some(build_view(cx)))
1280 .unwrap()
1281 }
1282
1283 pub fn add_option_view<T, F>(
1284 &mut self,
1285 window_id: usize,
1286 build_view: F,
1287 ) -> Option<ViewHandle<T>>
1288 where
1289 T: View,
1290 F: FnOnce(&mut ViewContext<T>) -> Option<T>,
1291 {
1292 let view_id = post_inc(&mut self.next_entity_id);
1293 self.pending_flushes += 1;
1294 let handle = ViewHandle::new(window_id, view_id, &self.cx.ref_counts);
1295 let mut cx = ViewContext::new(self, window_id, view_id);
1296 let handle = if let Some(view) = build_view(&mut cx) {
1297 self.cx.views.insert((window_id, view_id), Box::new(view));
1298 if let Some(window) = self.cx.windows.get_mut(&window_id) {
1299 window
1300 .invalidation
1301 .get_or_insert_with(Default::default)
1302 .updated
1303 .insert(view_id);
1304 }
1305 Some(handle)
1306 } else {
1307 None
1308 };
1309 self.flush_effects();
1310 handle
1311 }
1312
1313 pub fn element_state<Tag: 'static, T: 'static + Default>(
1314 &mut self,
1315 id: ElementStateId,
1316 ) -> ElementStateHandle<T> {
1317 let key = (TypeId::of::<Tag>(), id);
1318 self.cx
1319 .element_states
1320 .entry(key)
1321 .or_insert_with(|| Box::new(T::default()));
1322 ElementStateHandle::new(TypeId::of::<Tag>(), id, &self.cx.ref_counts)
1323 }
1324
1325 fn remove_dropped_entities(&mut self) {
1326 loop {
1327 let (dropped_models, dropped_views, dropped_element_states) =
1328 self.cx.ref_counts.lock().take_dropped();
1329 if dropped_models.is_empty()
1330 && dropped_views.is_empty()
1331 && dropped_element_states.is_empty()
1332 {
1333 break;
1334 }
1335
1336 for model_id in dropped_models {
1337 self.subscriptions.lock().remove(&model_id);
1338 self.observations.lock().remove(&model_id);
1339 let mut model = self.cx.models.remove(&model_id).unwrap();
1340 model.release(self);
1341 }
1342
1343 for (window_id, view_id) in dropped_views {
1344 self.subscriptions.lock().remove(&view_id);
1345 self.observations.lock().remove(&view_id);
1346 let mut view = self.cx.views.remove(&(window_id, view_id)).unwrap();
1347 view.release(self);
1348 let change_focus_to = self.cx.windows.get_mut(&window_id).and_then(|window| {
1349 window
1350 .invalidation
1351 .get_or_insert_with(Default::default)
1352 .removed
1353 .push(view_id);
1354 if window.focused_view_id == view_id {
1355 Some(window.root_view.id())
1356 } else {
1357 None
1358 }
1359 });
1360
1361 if let Some(view_id) = change_focus_to {
1362 self.focus(window_id, view_id);
1363 }
1364 }
1365
1366 for key in dropped_element_states {
1367 self.cx.element_states.remove(&key);
1368 }
1369 }
1370 }
1371
1372 fn flush_effects(&mut self) {
1373 self.pending_flushes = self.pending_flushes.saturating_sub(1);
1374
1375 if !self.flushing_effects && self.pending_flushes == 0 {
1376 self.flushing_effects = true;
1377
1378 let mut refreshing = false;
1379 loop {
1380 if let Some(effect) = self.pending_effects.pop_front() {
1381 match effect {
1382 Effect::Event { entity_id, payload } => self.emit_event(entity_id, payload),
1383 Effect::ModelNotification { model_id } => {
1384 self.notify_model_observers(model_id)
1385 }
1386 Effect::ViewNotification { window_id, view_id } => {
1387 self.notify_view_observers(window_id, view_id)
1388 }
1389 Effect::Focus { window_id, view_id } => {
1390 self.focus(window_id, view_id);
1391 }
1392 Effect::ResizeWindow { window_id } => {
1393 if let Some(window) = self.cx.windows.get_mut(&window_id) {
1394 window
1395 .invalidation
1396 .get_or_insert(WindowInvalidation::default());
1397 }
1398 }
1399 Effect::RefreshWindows => {
1400 refreshing = true;
1401 }
1402 }
1403 self.remove_dropped_entities();
1404 } else {
1405 self.remove_dropped_entities();
1406 if refreshing {
1407 self.perform_window_refresh();
1408 } else {
1409 self.update_windows();
1410 }
1411
1412 if self.pending_effects.is_empty() {
1413 self.flushing_effects = false;
1414 break;
1415 } else {
1416 refreshing = false;
1417 }
1418 }
1419 }
1420 }
1421 }
1422
1423 fn update_windows(&mut self) {
1424 let mut invalidations = HashMap::new();
1425 for (window_id, window) in &mut self.cx.windows {
1426 if let Some(invalidation) = window.invalidation.take() {
1427 invalidations.insert(*window_id, invalidation);
1428 }
1429 }
1430
1431 for (window_id, invalidation) in invalidations {
1432 if let Some((presenter, mut window)) =
1433 self.presenters_and_platform_windows.remove(&window_id)
1434 {
1435 {
1436 let mut presenter = presenter.borrow_mut();
1437 presenter.invalidate(invalidation, self);
1438 let scene =
1439 presenter.build_scene(window.size(), window.scale_factor(), false, self);
1440 window.present_scene(scene);
1441 }
1442 self.presenters_and_platform_windows
1443 .insert(window_id, (presenter, window));
1444 }
1445 }
1446 }
1447
1448 fn resize_window(&mut self, window_id: usize) {
1449 self.pending_effects
1450 .push_back(Effect::ResizeWindow { window_id });
1451 }
1452
1453 pub fn refresh_windows(&mut self) {
1454 self.pending_effects.push_back(Effect::RefreshWindows);
1455 }
1456
1457 fn perform_window_refresh(&mut self) {
1458 let mut presenters = mem::take(&mut self.presenters_and_platform_windows);
1459 for (window_id, (presenter, window)) in &mut presenters {
1460 let invalidation = self
1461 .cx
1462 .windows
1463 .get_mut(&window_id)
1464 .unwrap()
1465 .invalidation
1466 .take();
1467 let mut presenter = presenter.borrow_mut();
1468 presenter.refresh(invalidation, self);
1469 let scene = presenter.build_scene(window.size(), window.scale_factor(), true, self);
1470 window.present_scene(scene);
1471 }
1472 self.presenters_and_platform_windows = presenters;
1473 }
1474
1475 pub fn set_cursor_style(&mut self, style: CursorStyle) -> CursorStyleHandle {
1476 self.platform.set_cursor_style(style);
1477 let id = self.next_cursor_style_handle_id.fetch_add(1, SeqCst);
1478 CursorStyleHandle {
1479 id,
1480 next_cursor_style_handle_id: self.next_cursor_style_handle_id.clone(),
1481 platform: self.platform(),
1482 }
1483 }
1484
1485 fn emit_event(&mut self, entity_id: usize, payload: Box<dyn Any>) {
1486 let callbacks = self.subscriptions.lock().remove(&entity_id);
1487 if let Some(callbacks) = callbacks {
1488 for (id, mut callback) in callbacks {
1489 let alive = callback(payload.as_ref(), self);
1490 if alive {
1491 self.subscriptions
1492 .lock()
1493 .entry(entity_id)
1494 .or_default()
1495 .insert(id, callback);
1496 }
1497 }
1498 }
1499 }
1500
1501 fn notify_model_observers(&mut self, observed_id: usize) {
1502 let callbacks = self.observations.lock().remove(&observed_id);
1503 if let Some(callbacks) = callbacks {
1504 if self.cx.models.contains_key(&observed_id) {
1505 for (id, mut callback) in callbacks {
1506 let alive = callback(self);
1507 if alive {
1508 self.observations
1509 .lock()
1510 .entry(observed_id)
1511 .or_default()
1512 .insert(id, callback);
1513 }
1514 }
1515 }
1516 }
1517 }
1518
1519 fn notify_view_observers(&mut self, observed_window_id: usize, observed_view_id: usize) {
1520 if let Some(window) = self.cx.windows.get_mut(&observed_window_id) {
1521 window
1522 .invalidation
1523 .get_or_insert_with(Default::default)
1524 .updated
1525 .insert(observed_view_id);
1526 }
1527
1528 let callbacks = self.observations.lock().remove(&observed_view_id);
1529 if let Some(callbacks) = callbacks {
1530 if self
1531 .cx
1532 .views
1533 .contains_key(&(observed_window_id, observed_view_id))
1534 {
1535 for (id, mut callback) in callbacks {
1536 let alive = callback(self);
1537 if alive {
1538 self.observations
1539 .lock()
1540 .entry(observed_view_id)
1541 .or_default()
1542 .insert(id, callback);
1543 }
1544 }
1545 }
1546 }
1547 }
1548
1549 fn focus(&mut self, window_id: usize, focused_id: usize) {
1550 if self
1551 .cx
1552 .windows
1553 .get(&window_id)
1554 .map(|w| w.focused_view_id)
1555 .map_or(false, |cur_focused| cur_focused == focused_id)
1556 {
1557 return;
1558 }
1559
1560 self.pending_flushes += 1;
1561
1562 let blurred_id = self.cx.windows.get_mut(&window_id).map(|window| {
1563 let blurred_id = window.focused_view_id;
1564 window.focused_view_id = focused_id;
1565 blurred_id
1566 });
1567
1568 if let Some(blurred_id) = blurred_id {
1569 if let Some(mut blurred_view) = self.cx.views.remove(&(window_id, blurred_id)) {
1570 blurred_view.on_blur(self, window_id, blurred_id);
1571 self.cx.views.insert((window_id, blurred_id), blurred_view);
1572 }
1573 }
1574
1575 if let Some(mut focused_view) = self.cx.views.remove(&(window_id, focused_id)) {
1576 focused_view.on_focus(self, window_id, focused_id);
1577 self.cx.views.insert((window_id, focused_id), focused_view);
1578 }
1579
1580 self.flush_effects();
1581 }
1582
1583 pub fn spawn<F, Fut, T>(&self, f: F) -> Task<T>
1584 where
1585 F: FnOnce(AsyncAppContext) -> Fut,
1586 Fut: 'static + Future<Output = T>,
1587 T: 'static,
1588 {
1589 let cx = self.to_async();
1590 self.foreground.spawn(f(cx))
1591 }
1592
1593 pub fn to_async(&self) -> AsyncAppContext {
1594 AsyncAppContext(self.weak_self.as_ref().unwrap().upgrade().unwrap())
1595 }
1596
1597 pub fn write_to_clipboard(&self, item: ClipboardItem) {
1598 self.cx.platform.write_to_clipboard(item);
1599 }
1600
1601 pub fn read_from_clipboard(&self) -> Option<ClipboardItem> {
1602 self.cx.platform.read_from_clipboard()
1603 }
1604}
1605
1606impl ReadModel for MutableAppContext {
1607 fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T {
1608 if let Some(model) = self.cx.models.get(&handle.model_id) {
1609 model
1610 .as_any()
1611 .downcast_ref()
1612 .expect("downcast is type safe")
1613 } else {
1614 panic!("circular model reference");
1615 }
1616 }
1617}
1618
1619impl UpdateModel for MutableAppContext {
1620 fn update_model<T, F, S>(&mut self, handle: &ModelHandle<T>, update: F) -> S
1621 where
1622 T: Entity,
1623 F: FnOnce(&mut T, &mut ModelContext<T>) -> S,
1624 {
1625 if let Some(mut model) = self.cx.models.remove(&handle.model_id) {
1626 self.pending_flushes += 1;
1627 let mut cx = ModelContext::new(self, handle.model_id);
1628 let result = update(
1629 model
1630 .as_any_mut()
1631 .downcast_mut()
1632 .expect("downcast is type safe"),
1633 &mut cx,
1634 );
1635 self.cx.models.insert(handle.model_id, model);
1636 self.flush_effects();
1637 result
1638 } else {
1639 panic!("circular model update");
1640 }
1641 }
1642}
1643
1644impl UpgradeModelHandle for MutableAppContext {
1645 fn upgrade_model_handle<T: Entity>(
1646 &self,
1647 handle: WeakModelHandle<T>,
1648 ) -> Option<ModelHandle<T>> {
1649 self.cx.upgrade_model_handle(handle)
1650 }
1651}
1652
1653impl ReadView for MutableAppContext {
1654 fn read_view<T: View>(&self, handle: &ViewHandle<T>) -> &T {
1655 if let Some(view) = self.cx.views.get(&(handle.window_id, handle.view_id)) {
1656 view.as_any().downcast_ref().expect("downcast is type safe")
1657 } else {
1658 panic!("circular view reference");
1659 }
1660 }
1661}
1662
1663impl UpdateView for MutableAppContext {
1664 fn update_view<T, F, S>(&mut self, handle: &ViewHandle<T>, update: F) -> S
1665 where
1666 T: View,
1667 F: FnOnce(&mut T, &mut ViewContext<T>) -> S,
1668 {
1669 self.pending_flushes += 1;
1670 let mut view = self
1671 .cx
1672 .views
1673 .remove(&(handle.window_id, handle.view_id))
1674 .expect("circular view update");
1675
1676 let mut cx = ViewContext::new(self, handle.window_id, handle.view_id);
1677 let result = update(
1678 view.as_any_mut()
1679 .downcast_mut()
1680 .expect("downcast is type safe"),
1681 &mut cx,
1682 );
1683 self.cx
1684 .views
1685 .insert((handle.window_id, handle.view_id), view);
1686 self.flush_effects();
1687 result
1688 }
1689}
1690
1691impl AsRef<AppContext> for MutableAppContext {
1692 fn as_ref(&self) -> &AppContext {
1693 &self.cx
1694 }
1695}
1696
1697impl Deref for MutableAppContext {
1698 type Target = AppContext;
1699
1700 fn deref(&self) -> &Self::Target {
1701 &self.cx
1702 }
1703}
1704
1705pub struct AppContext {
1706 models: HashMap<usize, Box<dyn AnyModel>>,
1707 views: HashMap<(usize, usize), Box<dyn AnyView>>,
1708 windows: HashMap<usize, Window>,
1709 element_states: HashMap<(TypeId, ElementStateId), Box<dyn Any>>,
1710 background: Arc<executor::Background>,
1711 ref_counts: Arc<Mutex<RefCounts>>,
1712 font_cache: Arc<FontCache>,
1713 platform: Arc<dyn Platform>,
1714}
1715
1716impl AppContext {
1717 pub fn root_view_id(&self, window_id: usize) -> Option<usize> {
1718 self.windows
1719 .get(&window_id)
1720 .map(|window| window.root_view.id())
1721 }
1722
1723 pub fn focused_view_id(&self, window_id: usize) -> Option<usize> {
1724 self.windows
1725 .get(&window_id)
1726 .map(|window| window.focused_view_id)
1727 }
1728
1729 pub fn background(&self) -> &Arc<executor::Background> {
1730 &self.background
1731 }
1732
1733 pub fn font_cache(&self) -> &Arc<FontCache> {
1734 &self.font_cache
1735 }
1736
1737 pub fn platform(&self) -> &Arc<dyn Platform> {
1738 &self.platform
1739 }
1740}
1741
1742impl ReadModel for AppContext {
1743 fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T {
1744 if let Some(model) = self.models.get(&handle.model_id) {
1745 model
1746 .as_any()
1747 .downcast_ref()
1748 .expect("downcast should be type safe")
1749 } else {
1750 panic!("circular model reference");
1751 }
1752 }
1753}
1754
1755impl UpgradeModelHandle for AppContext {
1756 fn upgrade_model_handle<T: Entity>(
1757 &self,
1758 handle: WeakModelHandle<T>,
1759 ) -> Option<ModelHandle<T>> {
1760 if self.models.contains_key(&handle.model_id) {
1761 Some(ModelHandle::new(handle.model_id, &self.ref_counts))
1762 } else {
1763 None
1764 }
1765 }
1766}
1767
1768impl ReadView for AppContext {
1769 fn read_view<T: View>(&self, handle: &ViewHandle<T>) -> &T {
1770 if let Some(view) = self.views.get(&(handle.window_id, handle.view_id)) {
1771 view.as_any()
1772 .downcast_ref()
1773 .expect("downcast should be type safe")
1774 } else {
1775 panic!("circular view reference");
1776 }
1777 }
1778}
1779
1780struct Window {
1781 root_view: AnyViewHandle,
1782 focused_view_id: usize,
1783 invalidation: Option<WindowInvalidation>,
1784}
1785
1786#[derive(Default, Clone)]
1787pub struct WindowInvalidation {
1788 pub updated: HashSet<usize>,
1789 pub removed: Vec<usize>,
1790}
1791
1792pub enum Effect {
1793 Event {
1794 entity_id: usize,
1795 payload: Box<dyn Any>,
1796 },
1797 ModelNotification {
1798 model_id: usize,
1799 },
1800 ViewNotification {
1801 window_id: usize,
1802 view_id: usize,
1803 },
1804 Focus {
1805 window_id: usize,
1806 view_id: usize,
1807 },
1808 ResizeWindow {
1809 window_id: usize,
1810 },
1811 RefreshWindows,
1812}
1813
1814impl Debug for Effect {
1815 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
1816 match self {
1817 Effect::Event { entity_id, .. } => f
1818 .debug_struct("Effect::Event")
1819 .field("entity_id", entity_id)
1820 .finish(),
1821 Effect::ModelNotification { model_id } => f
1822 .debug_struct("Effect::ModelNotification")
1823 .field("model_id", model_id)
1824 .finish(),
1825 Effect::ViewNotification { window_id, view_id } => f
1826 .debug_struct("Effect::ViewNotification")
1827 .field("window_id", window_id)
1828 .field("view_id", view_id)
1829 .finish(),
1830 Effect::Focus { window_id, view_id } => f
1831 .debug_struct("Effect::Focus")
1832 .field("window_id", window_id)
1833 .field("view_id", view_id)
1834 .finish(),
1835 Effect::ResizeWindow { window_id } => f
1836 .debug_struct("Effect::RefreshWindow")
1837 .field("window_id", window_id)
1838 .finish(),
1839 Effect::RefreshWindows => f.debug_struct("Effect::FullViewRefresh").finish(),
1840 }
1841 }
1842}
1843
1844pub trait AnyModel {
1845 fn as_any(&self) -> &dyn Any;
1846 fn as_any_mut(&mut self) -> &mut dyn Any;
1847 fn release(&mut self, cx: &mut MutableAppContext);
1848}
1849
1850impl<T> AnyModel for T
1851where
1852 T: Entity,
1853{
1854 fn as_any(&self) -> &dyn Any {
1855 self
1856 }
1857
1858 fn as_any_mut(&mut self) -> &mut dyn Any {
1859 self
1860 }
1861
1862 fn release(&mut self, cx: &mut MutableAppContext) {
1863 self.release(cx);
1864 }
1865}
1866
1867pub trait AnyView {
1868 fn as_any(&self) -> &dyn Any;
1869 fn as_any_mut(&mut self) -> &mut dyn Any;
1870 fn release(&mut self, cx: &mut MutableAppContext);
1871 fn ui_name(&self) -> &'static str;
1872 fn render<'a>(
1873 &mut self,
1874 window_id: usize,
1875 view_id: usize,
1876 titlebar_height: f32,
1877 refreshing: bool,
1878 cx: &mut MutableAppContext,
1879 ) -> ElementBox;
1880 fn on_focus(&mut self, cx: &mut MutableAppContext, window_id: usize, view_id: usize);
1881 fn on_blur(&mut self, cx: &mut MutableAppContext, window_id: usize, view_id: usize);
1882 fn keymap_context(&self, cx: &AppContext) -> keymap::Context;
1883}
1884
1885impl<T> AnyView for T
1886where
1887 T: View,
1888{
1889 fn as_any(&self) -> &dyn Any {
1890 self
1891 }
1892
1893 fn as_any_mut(&mut self) -> &mut dyn Any {
1894 self
1895 }
1896
1897 fn release(&mut self, cx: &mut MutableAppContext) {
1898 self.release(cx);
1899 }
1900
1901 fn ui_name(&self) -> &'static str {
1902 T::ui_name()
1903 }
1904
1905 fn render<'a>(
1906 &mut self,
1907 window_id: usize,
1908 view_id: usize,
1909 titlebar_height: f32,
1910 refreshing: bool,
1911 cx: &mut MutableAppContext,
1912 ) -> ElementBox {
1913 View::render(
1914 self,
1915 &mut RenderContext {
1916 window_id,
1917 view_id,
1918 app: cx,
1919 view_type: PhantomData::<T>,
1920 titlebar_height,
1921 refreshing,
1922 },
1923 )
1924 }
1925
1926 fn on_focus(&mut self, cx: &mut MutableAppContext, window_id: usize, view_id: usize) {
1927 let mut cx = ViewContext::new(cx, window_id, view_id);
1928 View::on_focus(self, &mut cx);
1929 }
1930
1931 fn on_blur(&mut self, cx: &mut MutableAppContext, window_id: usize, view_id: usize) {
1932 let mut cx = ViewContext::new(cx, window_id, view_id);
1933 View::on_blur(self, &mut cx);
1934 }
1935
1936 fn keymap_context(&self, cx: &AppContext) -> keymap::Context {
1937 View::keymap_context(self, cx)
1938 }
1939}
1940
1941pub struct ModelContext<'a, T: ?Sized> {
1942 app: &'a mut MutableAppContext,
1943 model_id: usize,
1944 model_type: PhantomData<T>,
1945 halt_stream: bool,
1946}
1947
1948impl<'a, T: Entity> ModelContext<'a, T> {
1949 fn new(app: &'a mut MutableAppContext, model_id: usize) -> Self {
1950 Self {
1951 app,
1952 model_id,
1953 model_type: PhantomData,
1954 halt_stream: false,
1955 }
1956 }
1957
1958 pub fn background(&self) -> &Arc<executor::Background> {
1959 &self.app.cx.background
1960 }
1961
1962 pub fn halt_stream(&mut self) {
1963 self.halt_stream = true;
1964 }
1965
1966 pub fn model_id(&self) -> usize {
1967 self.model_id
1968 }
1969
1970 pub fn add_model<S, F>(&mut self, build_model: F) -> ModelHandle<S>
1971 where
1972 S: Entity,
1973 F: FnOnce(&mut ModelContext<S>) -> S,
1974 {
1975 self.app.add_model(build_model)
1976 }
1977
1978 pub fn emit(&mut self, payload: T::Event) {
1979 self.app.pending_effects.push_back(Effect::Event {
1980 entity_id: self.model_id,
1981 payload: Box::new(payload),
1982 });
1983 }
1984
1985 pub fn notify(&mut self) {
1986 self.app
1987 .pending_effects
1988 .push_back(Effect::ModelNotification {
1989 model_id: self.model_id,
1990 });
1991 }
1992
1993 pub fn subscribe<S: Entity, F>(
1994 &mut self,
1995 handle: &ModelHandle<S>,
1996 mut callback: F,
1997 ) -> Subscription
1998 where
1999 S::Event: 'static,
2000 F: 'static + FnMut(&mut T, ModelHandle<S>, &S::Event, &mut ModelContext<T>),
2001 {
2002 let subscriber = self.handle().downgrade();
2003 self.app
2004 .subscribe_internal(handle, move |emitter, event, cx| {
2005 if let Some(subscriber) = subscriber.upgrade(cx) {
2006 subscriber.update(cx, |subscriber, cx| {
2007 callback(subscriber, emitter, event, cx);
2008 });
2009 true
2010 } else {
2011 false
2012 }
2013 })
2014 }
2015
2016 pub fn observe<S, F>(&mut self, handle: &ModelHandle<S>, mut callback: F) -> Subscription
2017 where
2018 S: Entity,
2019 F: 'static + FnMut(&mut T, ModelHandle<S>, &mut ModelContext<T>),
2020 {
2021 let observer = self.handle().downgrade();
2022 self.app.observe_internal(handle, move |observed, cx| {
2023 if let Some(observer) = observer.upgrade(cx) {
2024 observer.update(cx, |observer, cx| {
2025 callback(observer, observed, cx);
2026 });
2027 true
2028 } else {
2029 false
2030 }
2031 })
2032 }
2033
2034 pub fn handle(&self) -> ModelHandle<T> {
2035 ModelHandle::new(self.model_id, &self.app.cx.ref_counts)
2036 }
2037
2038 pub fn spawn<F, Fut, S>(&self, f: F) -> Task<S>
2039 where
2040 F: FnOnce(ModelHandle<T>, AsyncAppContext) -> Fut,
2041 Fut: 'static + Future<Output = S>,
2042 S: 'static,
2043 {
2044 let handle = self.handle();
2045 self.app.spawn(|cx| f(handle, cx))
2046 }
2047
2048 pub fn spawn_weak<F, Fut, S>(&self, f: F) -> Task<S>
2049 where
2050 F: FnOnce(WeakModelHandle<T>, AsyncAppContext) -> Fut,
2051 Fut: 'static + Future<Output = S>,
2052 S: 'static,
2053 {
2054 let handle = self.handle().downgrade();
2055 self.app.spawn(|cx| f(handle, cx))
2056 }
2057}
2058
2059impl<M> AsRef<AppContext> for ModelContext<'_, M> {
2060 fn as_ref(&self) -> &AppContext {
2061 &self.app.cx
2062 }
2063}
2064
2065impl<M> AsMut<MutableAppContext> for ModelContext<'_, M> {
2066 fn as_mut(&mut self) -> &mut MutableAppContext {
2067 self.app
2068 }
2069}
2070
2071impl<M> ReadModel for ModelContext<'_, M> {
2072 fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T {
2073 self.app.read_model(handle)
2074 }
2075}
2076
2077impl<M> UpdateModel for ModelContext<'_, M> {
2078 fn update_model<T, F, S>(&mut self, handle: &ModelHandle<T>, update: F) -> S
2079 where
2080 T: Entity,
2081 F: FnOnce(&mut T, &mut ModelContext<T>) -> S,
2082 {
2083 self.app.update_model(handle, update)
2084 }
2085}
2086
2087impl<M> UpgradeModelHandle for ModelContext<'_, M> {
2088 fn upgrade_model_handle<T: Entity>(
2089 &self,
2090 handle: WeakModelHandle<T>,
2091 ) -> Option<ModelHandle<T>> {
2092 self.cx.upgrade_model_handle(handle)
2093 }
2094}
2095
2096impl<M> Deref for ModelContext<'_, M> {
2097 type Target = MutableAppContext;
2098
2099 fn deref(&self) -> &Self::Target {
2100 &self.app
2101 }
2102}
2103
2104impl<M> DerefMut for ModelContext<'_, M> {
2105 fn deref_mut(&mut self) -> &mut Self::Target {
2106 &mut self.app
2107 }
2108}
2109
2110pub struct ViewContext<'a, T: ?Sized> {
2111 app: &'a mut MutableAppContext,
2112 window_id: usize,
2113 view_id: usize,
2114 view_type: PhantomData<T>,
2115 halt_action_dispatch: bool,
2116}
2117
2118impl<'a, T: View> ViewContext<'a, T> {
2119 fn new(app: &'a mut MutableAppContext, window_id: usize, view_id: usize) -> Self {
2120 Self {
2121 app,
2122 window_id,
2123 view_id,
2124 view_type: PhantomData,
2125 halt_action_dispatch: true,
2126 }
2127 }
2128
2129 pub fn handle(&self) -> ViewHandle<T> {
2130 ViewHandle::new(self.window_id, self.view_id, &self.app.cx.ref_counts)
2131 }
2132
2133 pub fn window_id(&self) -> usize {
2134 self.window_id
2135 }
2136
2137 pub fn view_id(&self) -> usize {
2138 self.view_id
2139 }
2140
2141 pub fn foreground(&self) -> &Rc<executor::Foreground> {
2142 self.app.foreground()
2143 }
2144
2145 pub fn background_executor(&self) -> &Arc<executor::Background> {
2146 &self.app.cx.background
2147 }
2148
2149 pub fn platform(&self) -> Arc<dyn Platform> {
2150 self.app.platform()
2151 }
2152
2153 pub fn prompt<F>(&self, level: PromptLevel, msg: &str, answers: &[&str], done_fn: F)
2154 where
2155 F: 'static + FnOnce(usize, &mut MutableAppContext),
2156 {
2157 self.app
2158 .prompt(self.window_id, level, msg, answers, done_fn)
2159 }
2160
2161 pub fn prompt_for_paths<F>(&self, options: PathPromptOptions, done_fn: F)
2162 where
2163 F: 'static + FnOnce(Option<Vec<PathBuf>>, &mut MutableAppContext),
2164 {
2165 self.app.prompt_for_paths(options, done_fn)
2166 }
2167
2168 pub fn prompt_for_new_path<F>(&self, directory: &Path, done_fn: F)
2169 where
2170 F: 'static + FnOnce(Option<PathBuf>, &mut MutableAppContext),
2171 {
2172 self.app.prompt_for_new_path(directory, done_fn)
2173 }
2174
2175 pub fn debug_elements(&self) -> crate::json::Value {
2176 self.app.debug_elements(self.window_id).unwrap()
2177 }
2178
2179 pub fn focus<S>(&mut self, handle: S)
2180 where
2181 S: Into<AnyViewHandle>,
2182 {
2183 let handle = handle.into();
2184 self.app.pending_effects.push_back(Effect::Focus {
2185 window_id: handle.window_id,
2186 view_id: handle.view_id,
2187 });
2188 }
2189
2190 pub fn focus_self(&mut self) {
2191 self.app.pending_effects.push_back(Effect::Focus {
2192 window_id: self.window_id,
2193 view_id: self.view_id,
2194 });
2195 }
2196
2197 pub fn add_model<S, F>(&mut self, build_model: F) -> ModelHandle<S>
2198 where
2199 S: Entity,
2200 F: FnOnce(&mut ModelContext<S>) -> S,
2201 {
2202 self.app.add_model(build_model)
2203 }
2204
2205 pub fn add_view<S, F>(&mut self, build_view: F) -> ViewHandle<S>
2206 where
2207 S: View,
2208 F: FnOnce(&mut ViewContext<S>) -> S,
2209 {
2210 self.app.add_view(self.window_id, build_view)
2211 }
2212
2213 pub fn add_option_view<S, F>(&mut self, build_view: F) -> Option<ViewHandle<S>>
2214 where
2215 S: View,
2216 F: FnOnce(&mut ViewContext<S>) -> Option<S>,
2217 {
2218 self.app.add_option_view(self.window_id, build_view)
2219 }
2220
2221 pub fn subscribe<E, H, F>(&mut self, handle: &H, mut callback: F) -> Subscription
2222 where
2223 E: Entity,
2224 E::Event: 'static,
2225 H: Handle<E>,
2226 F: 'static + FnMut(&mut T, H, &E::Event, &mut ViewContext<T>),
2227 {
2228 let subscriber = self.handle().downgrade();
2229 self.app
2230 .subscribe_internal(handle, move |emitter, event, cx| {
2231 if let Some(subscriber) = subscriber.upgrade(cx) {
2232 subscriber.update(cx, |subscriber, cx| {
2233 callback(subscriber, emitter, event, cx);
2234 });
2235 true
2236 } else {
2237 false
2238 }
2239 })
2240 }
2241
2242 pub fn observe<E, F, H>(&mut self, handle: &H, mut callback: F) -> Subscription
2243 where
2244 E: Entity,
2245 H: Handle<E>,
2246 F: 'static + FnMut(&mut T, H, &mut ViewContext<T>),
2247 {
2248 let observer = self.handle().downgrade();
2249 self.app.observe_internal(handle, move |observed, cx| {
2250 if let Some(observer) = observer.upgrade(cx) {
2251 observer.update(cx, |observer, cx| {
2252 callback(observer, observed, cx);
2253 });
2254 true
2255 } else {
2256 false
2257 }
2258 })
2259 }
2260
2261 pub fn emit(&mut self, payload: T::Event) {
2262 self.app.pending_effects.push_back(Effect::Event {
2263 entity_id: self.view_id,
2264 payload: Box::new(payload),
2265 });
2266 }
2267
2268 pub fn notify(&mut self) {
2269 self.app.notify_view(self.window_id, self.view_id);
2270 }
2271
2272 pub fn propagate_action(&mut self) {
2273 self.halt_action_dispatch = false;
2274 }
2275
2276 pub fn spawn<F, Fut, S>(&self, f: F) -> Task<S>
2277 where
2278 F: FnOnce(ViewHandle<T>, AsyncAppContext) -> Fut,
2279 Fut: 'static + Future<Output = S>,
2280 S: 'static,
2281 {
2282 let handle = self.handle();
2283 self.app.spawn(|cx| f(handle, cx))
2284 }
2285
2286 pub fn spawn_weak<F, Fut, S>(&self, f: F) -> Task<S>
2287 where
2288 F: FnOnce(WeakViewHandle<T>, AsyncAppContext) -> Fut,
2289 Fut: 'static + Future<Output = S>,
2290 S: 'static,
2291 {
2292 let handle = self.handle().downgrade();
2293 self.app.spawn(|cx| f(handle, cx))
2294 }
2295}
2296
2297pub struct RenderContext<'a, T: View> {
2298 pub app: &'a mut MutableAppContext,
2299 pub titlebar_height: f32,
2300 pub refreshing: bool,
2301 window_id: usize,
2302 view_id: usize,
2303 view_type: PhantomData<T>,
2304}
2305
2306impl<'a, T: View> RenderContext<'a, T> {
2307 pub fn handle(&self) -> WeakViewHandle<T> {
2308 WeakViewHandle::new(self.window_id, self.view_id)
2309 }
2310}
2311
2312impl AsRef<AppContext> for &AppContext {
2313 fn as_ref(&self) -> &AppContext {
2314 self
2315 }
2316}
2317
2318impl<V: View> Deref for RenderContext<'_, V> {
2319 type Target = MutableAppContext;
2320
2321 fn deref(&self) -> &Self::Target {
2322 self.app
2323 }
2324}
2325
2326impl<V: View> DerefMut for RenderContext<'_, V> {
2327 fn deref_mut(&mut self) -> &mut Self::Target {
2328 self.app
2329 }
2330}
2331
2332impl<V: View> ReadModel for RenderContext<'_, V> {
2333 fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T {
2334 self.app.read_model(handle)
2335 }
2336}
2337
2338impl<M> AsRef<AppContext> for ViewContext<'_, M> {
2339 fn as_ref(&self) -> &AppContext {
2340 &self.app.cx
2341 }
2342}
2343
2344impl<M> Deref for ViewContext<'_, M> {
2345 type Target = MutableAppContext;
2346
2347 fn deref(&self) -> &Self::Target {
2348 &self.app
2349 }
2350}
2351
2352impl<M> DerefMut for ViewContext<'_, M> {
2353 fn deref_mut(&mut self) -> &mut Self::Target {
2354 &mut self.app
2355 }
2356}
2357
2358impl<M> AsMut<MutableAppContext> for ViewContext<'_, M> {
2359 fn as_mut(&mut self) -> &mut MutableAppContext {
2360 self.app
2361 }
2362}
2363
2364impl<V> ReadModel for ViewContext<'_, V> {
2365 fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T {
2366 self.app.read_model(handle)
2367 }
2368}
2369
2370impl<V> UpgradeModelHandle for ViewContext<'_, V> {
2371 fn upgrade_model_handle<T: Entity>(
2372 &self,
2373 handle: WeakModelHandle<T>,
2374 ) -> Option<ModelHandle<T>> {
2375 self.cx.upgrade_model_handle(handle)
2376 }
2377}
2378
2379impl<V: View> UpdateModel for ViewContext<'_, V> {
2380 fn update_model<T, F, S>(&mut self, handle: &ModelHandle<T>, update: F) -> S
2381 where
2382 T: Entity,
2383 F: FnOnce(&mut T, &mut ModelContext<T>) -> S,
2384 {
2385 self.app.update_model(handle, update)
2386 }
2387}
2388
2389impl<V: View> ReadView for ViewContext<'_, V> {
2390 fn read_view<T: View>(&self, handle: &ViewHandle<T>) -> &T {
2391 self.app.read_view(handle)
2392 }
2393}
2394
2395impl<V: View> UpdateView for ViewContext<'_, V> {
2396 fn update_view<T, F, S>(&mut self, handle: &ViewHandle<T>, update: F) -> S
2397 where
2398 T: View,
2399 F: FnOnce(&mut T, &mut ViewContext<T>) -> S,
2400 {
2401 self.app.update_view(handle, update)
2402 }
2403}
2404
2405pub trait Handle<T> {
2406 type Weak: 'static;
2407 fn id(&self) -> usize;
2408 fn location(&self) -> EntityLocation;
2409 fn downgrade(&self) -> Self::Weak;
2410 fn upgrade_from(weak: &Self::Weak, cx: &AppContext) -> Option<Self>
2411 where
2412 Self: Sized;
2413}
2414
2415#[derive(Clone, Copy, Debug, Eq, PartialEq, Hash)]
2416pub enum EntityLocation {
2417 Model(usize),
2418 View(usize, usize),
2419}
2420
2421pub struct ModelHandle<T> {
2422 model_id: usize,
2423 model_type: PhantomData<T>,
2424 ref_counts: Arc<Mutex<RefCounts>>,
2425}
2426
2427impl<T: Entity> ModelHandle<T> {
2428 fn new(model_id: usize, ref_counts: &Arc<Mutex<RefCounts>>) -> Self {
2429 ref_counts.lock().inc_model(model_id);
2430 Self {
2431 model_id,
2432 model_type: PhantomData,
2433 ref_counts: ref_counts.clone(),
2434 }
2435 }
2436
2437 pub fn downgrade(&self) -> WeakModelHandle<T> {
2438 WeakModelHandle::new(self.model_id)
2439 }
2440
2441 pub fn id(&self) -> usize {
2442 self.model_id
2443 }
2444
2445 pub fn read<'a, C: ReadModel>(&self, cx: &'a C) -> &'a T {
2446 cx.read_model(self)
2447 }
2448
2449 pub fn read_with<'a, C, F, S>(&self, cx: &C, read: F) -> S
2450 where
2451 C: ReadModelWith,
2452 F: FnOnce(&T, &AppContext) -> S,
2453 {
2454 cx.read_model_with(self, read)
2455 }
2456
2457 pub fn update<C, F, S>(&self, cx: &mut C, update: F) -> S
2458 where
2459 C: UpdateModel,
2460 F: FnOnce(&mut T, &mut ModelContext<T>) -> S,
2461 {
2462 cx.update_model(self, update)
2463 }
2464
2465 pub fn next_notification(&self, cx: &TestAppContext) -> impl Future<Output = ()> {
2466 let (mut tx, mut rx) = mpsc::channel(1);
2467 let mut cx = cx.cx.borrow_mut();
2468 let subscription = cx.observe(self, move |_, _| {
2469 tx.blocking_send(()).ok();
2470 });
2471
2472 let duration = if std::env::var("CI").is_ok() {
2473 Duration::from_secs(5)
2474 } else {
2475 Duration::from_secs(1)
2476 };
2477
2478 async move {
2479 let notification = timeout(duration, rx.recv())
2480 .await
2481 .expect("next notification timed out");
2482 drop(subscription);
2483 notification.expect("model dropped while test was waiting for its next notification")
2484 }
2485 }
2486
2487 pub fn next_event(&self, cx: &TestAppContext) -> impl Future<Output = T::Event>
2488 where
2489 T::Event: Clone,
2490 {
2491 let (mut tx, mut rx) = mpsc::channel(1);
2492 let mut cx = cx.cx.borrow_mut();
2493 let subscription = cx.subscribe(self, move |_, event, _| {
2494 tx.blocking_send(event.clone()).ok();
2495 });
2496
2497 let duration = if std::env::var("CI").is_ok() {
2498 Duration::from_secs(5)
2499 } else {
2500 Duration::from_secs(1)
2501 };
2502
2503 async move {
2504 let event = timeout(duration, rx.recv())
2505 .await
2506 .expect("next event timed out");
2507 drop(subscription);
2508 event.expect("model dropped while test was waiting for its next event")
2509 }
2510 }
2511
2512 pub fn condition(
2513 &self,
2514 cx: &TestAppContext,
2515 mut predicate: impl FnMut(&T, &AppContext) -> bool,
2516 ) -> impl Future<Output = ()> {
2517 let (tx, mut rx) = mpsc::channel(1024);
2518
2519 let mut cx = cx.cx.borrow_mut();
2520 let subscriptions = (
2521 cx.observe(self, {
2522 let mut tx = tx.clone();
2523 move |_, _| {
2524 tx.blocking_send(()).ok();
2525 }
2526 }),
2527 cx.subscribe(self, {
2528 let mut tx = tx.clone();
2529 move |_, _, _| {
2530 tx.blocking_send(()).ok();
2531 }
2532 }),
2533 );
2534
2535 let cx = cx.weak_self.as_ref().unwrap().upgrade().unwrap();
2536 let handle = self.downgrade();
2537 let duration = if std::env::var("CI").is_ok() {
2538 Duration::from_secs(5)
2539 } else {
2540 Duration::from_secs(1)
2541 };
2542
2543 async move {
2544 timeout(duration, async move {
2545 loop {
2546 {
2547 let cx = cx.borrow();
2548 let cx = cx.as_ref();
2549 if predicate(
2550 handle
2551 .upgrade(cx)
2552 .expect("model dropped with pending condition")
2553 .read(cx),
2554 cx,
2555 ) {
2556 break;
2557 }
2558 }
2559
2560 rx.recv()
2561 .await
2562 .expect("model dropped with pending condition");
2563 }
2564 })
2565 .await
2566 .expect("condition timed out");
2567 drop(subscriptions);
2568 }
2569 }
2570}
2571
2572impl<T> Clone for ModelHandle<T> {
2573 fn clone(&self) -> Self {
2574 self.ref_counts.lock().inc_model(self.model_id);
2575 Self {
2576 model_id: self.model_id,
2577 model_type: PhantomData,
2578 ref_counts: self.ref_counts.clone(),
2579 }
2580 }
2581}
2582
2583impl<T> PartialEq for ModelHandle<T> {
2584 fn eq(&self, other: &Self) -> bool {
2585 self.model_id == other.model_id
2586 }
2587}
2588
2589impl<T> Eq for ModelHandle<T> {}
2590
2591impl<T> Hash for ModelHandle<T> {
2592 fn hash<H: Hasher>(&self, state: &mut H) {
2593 self.model_id.hash(state);
2594 }
2595}
2596
2597impl<T> std::borrow::Borrow<usize> for ModelHandle<T> {
2598 fn borrow(&self) -> &usize {
2599 &self.model_id
2600 }
2601}
2602
2603impl<T> Debug for ModelHandle<T> {
2604 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
2605 f.debug_tuple(&format!("ModelHandle<{}>", type_name::<T>()))
2606 .field(&self.model_id)
2607 .finish()
2608 }
2609}
2610
2611unsafe impl<T> Send for ModelHandle<T> {}
2612unsafe impl<T> Sync for ModelHandle<T> {}
2613
2614impl<T> Drop for ModelHandle<T> {
2615 fn drop(&mut self) {
2616 self.ref_counts.lock().dec_model(self.model_id);
2617 }
2618}
2619
2620impl<T: Entity> Handle<T> for ModelHandle<T> {
2621 type Weak = WeakModelHandle<T>;
2622
2623 fn id(&self) -> usize {
2624 self.model_id
2625 }
2626
2627 fn location(&self) -> EntityLocation {
2628 EntityLocation::Model(self.model_id)
2629 }
2630
2631 fn downgrade(&self) -> Self::Weak {
2632 self.downgrade()
2633 }
2634
2635 fn upgrade_from(weak: &Self::Weak, cx: &AppContext) -> Option<Self>
2636 where
2637 Self: Sized,
2638 {
2639 weak.upgrade(cx)
2640 }
2641}
2642
2643pub struct WeakModelHandle<T> {
2644 model_id: usize,
2645 model_type: PhantomData<T>,
2646}
2647
2648unsafe impl<T> Send for WeakModelHandle<T> {}
2649unsafe impl<T> Sync for WeakModelHandle<T> {}
2650
2651impl<T: Entity> WeakModelHandle<T> {
2652 fn new(model_id: usize) -> Self {
2653 Self {
2654 model_id,
2655 model_type: PhantomData,
2656 }
2657 }
2658
2659 pub fn upgrade(self, cx: &impl UpgradeModelHandle) -> Option<ModelHandle<T>> {
2660 cx.upgrade_model_handle(self)
2661 }
2662}
2663
2664impl<T> Hash for WeakModelHandle<T> {
2665 fn hash<H: Hasher>(&self, state: &mut H) {
2666 self.model_id.hash(state)
2667 }
2668}
2669
2670impl<T> PartialEq for WeakModelHandle<T> {
2671 fn eq(&self, other: &Self) -> bool {
2672 self.model_id == other.model_id
2673 }
2674}
2675
2676impl<T> Eq for WeakModelHandle<T> {}
2677
2678impl<T> Clone for WeakModelHandle<T> {
2679 fn clone(&self) -> Self {
2680 Self {
2681 model_id: self.model_id,
2682 model_type: PhantomData,
2683 }
2684 }
2685}
2686
2687impl<T> Copy for WeakModelHandle<T> {}
2688
2689pub struct ViewHandle<T> {
2690 window_id: usize,
2691 view_id: usize,
2692 view_type: PhantomData<T>,
2693 ref_counts: Arc<Mutex<RefCounts>>,
2694}
2695
2696impl<T: View> ViewHandle<T> {
2697 fn new(window_id: usize, view_id: usize, ref_counts: &Arc<Mutex<RefCounts>>) -> Self {
2698 ref_counts.lock().inc_view(window_id, view_id);
2699 Self {
2700 window_id,
2701 view_id,
2702 view_type: PhantomData,
2703 ref_counts: ref_counts.clone(),
2704 }
2705 }
2706
2707 pub fn downgrade(&self) -> WeakViewHandle<T> {
2708 WeakViewHandle::new(self.window_id, self.view_id)
2709 }
2710
2711 pub fn window_id(&self) -> usize {
2712 self.window_id
2713 }
2714
2715 pub fn id(&self) -> usize {
2716 self.view_id
2717 }
2718
2719 pub fn read<'a, C: ReadView>(&self, cx: &'a C) -> &'a T {
2720 cx.read_view(self)
2721 }
2722
2723 pub fn read_with<C, F, S>(&self, cx: &C, read: F) -> S
2724 where
2725 C: ReadViewWith,
2726 F: FnOnce(&T, &AppContext) -> S,
2727 {
2728 cx.read_view_with(self, read)
2729 }
2730
2731 pub fn update<C, F, S>(&self, cx: &mut C, update: F) -> S
2732 where
2733 C: UpdateView,
2734 F: FnOnce(&mut T, &mut ViewContext<T>) -> S,
2735 {
2736 cx.update_view(self, update)
2737 }
2738
2739 pub fn is_focused(&self, cx: &AppContext) -> bool {
2740 cx.focused_view_id(self.window_id)
2741 .map_or(false, |focused_id| focused_id == self.view_id)
2742 }
2743
2744 pub fn condition(
2745 &self,
2746 cx: &TestAppContext,
2747 mut predicate: impl FnMut(&T, &AppContext) -> bool,
2748 ) -> impl Future<Output = ()> {
2749 let (tx, mut rx) = mpsc::channel(1024);
2750
2751 let mut cx = cx.cx.borrow_mut();
2752 let subscriptions = self.update(&mut *cx, |_, cx| {
2753 (
2754 cx.observe(self, {
2755 let mut tx = tx.clone();
2756 move |_, _, _| {
2757 tx.blocking_send(()).ok();
2758 }
2759 }),
2760 cx.subscribe(self, {
2761 let mut tx = tx.clone();
2762 move |_, _, _, _| {
2763 tx.blocking_send(()).ok();
2764 }
2765 }),
2766 )
2767 });
2768
2769 let cx = cx.weak_self.as_ref().unwrap().upgrade().unwrap();
2770 let handle = self.downgrade();
2771 let duration = if std::env::var("CI").is_ok() {
2772 Duration::from_secs(2)
2773 } else {
2774 Duration::from_millis(500)
2775 };
2776
2777 async move {
2778 timeout(duration, async move {
2779 loop {
2780 {
2781 let cx = cx.borrow();
2782 let cx = cx.as_ref();
2783 if predicate(
2784 handle
2785 .upgrade(cx)
2786 .expect("view dropped with pending condition")
2787 .read(cx),
2788 cx,
2789 ) {
2790 break;
2791 }
2792 }
2793
2794 rx.recv()
2795 .await
2796 .expect("view dropped with pending condition");
2797 }
2798 })
2799 .await
2800 .expect("condition timed out");
2801 drop(subscriptions);
2802 }
2803 }
2804}
2805
2806impl<T> Clone for ViewHandle<T> {
2807 fn clone(&self) -> Self {
2808 self.ref_counts
2809 .lock()
2810 .inc_view(self.window_id, self.view_id);
2811 Self {
2812 window_id: self.window_id,
2813 view_id: self.view_id,
2814 view_type: PhantomData,
2815 ref_counts: self.ref_counts.clone(),
2816 }
2817 }
2818}
2819
2820impl<T> PartialEq for ViewHandle<T> {
2821 fn eq(&self, other: &Self) -> bool {
2822 self.window_id == other.window_id && self.view_id == other.view_id
2823 }
2824}
2825
2826impl<T> Eq for ViewHandle<T> {}
2827
2828impl<T> Debug for ViewHandle<T> {
2829 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
2830 f.debug_struct(&format!("ViewHandle<{}>", type_name::<T>()))
2831 .field("window_id", &self.window_id)
2832 .field("view_id", &self.view_id)
2833 .finish()
2834 }
2835}
2836
2837impl<T> Drop for ViewHandle<T> {
2838 fn drop(&mut self) {
2839 self.ref_counts
2840 .lock()
2841 .dec_view(self.window_id, self.view_id);
2842 }
2843}
2844
2845impl<T: View> Handle<T> for ViewHandle<T> {
2846 type Weak = WeakViewHandle<T>;
2847
2848 fn id(&self) -> usize {
2849 self.view_id
2850 }
2851
2852 fn location(&self) -> EntityLocation {
2853 EntityLocation::View(self.window_id, self.view_id)
2854 }
2855
2856 fn downgrade(&self) -> Self::Weak {
2857 self.downgrade()
2858 }
2859
2860 fn upgrade_from(weak: &Self::Weak, cx: &AppContext) -> Option<Self>
2861 where
2862 Self: Sized,
2863 {
2864 weak.upgrade(cx)
2865 }
2866}
2867
2868pub struct AnyViewHandle {
2869 window_id: usize,
2870 view_id: usize,
2871 view_type: TypeId,
2872 ref_counts: Arc<Mutex<RefCounts>>,
2873}
2874
2875impl AnyViewHandle {
2876 pub fn id(&self) -> usize {
2877 self.view_id
2878 }
2879
2880 pub fn is<T: 'static>(&self) -> bool {
2881 TypeId::of::<T>() == self.view_type
2882 }
2883
2884 pub fn downcast<T: View>(self) -> Option<ViewHandle<T>> {
2885 if self.is::<T>() {
2886 let result = Some(ViewHandle {
2887 window_id: self.window_id,
2888 view_id: self.view_id,
2889 ref_counts: self.ref_counts.clone(),
2890 view_type: PhantomData,
2891 });
2892 unsafe {
2893 Arc::decrement_strong_count(&self.ref_counts);
2894 }
2895 std::mem::forget(self);
2896 result
2897 } else {
2898 None
2899 }
2900 }
2901}
2902
2903impl Clone for AnyViewHandle {
2904 fn clone(&self) -> Self {
2905 self.ref_counts
2906 .lock()
2907 .inc_view(self.window_id, self.view_id);
2908 Self {
2909 window_id: self.window_id,
2910 view_id: self.view_id,
2911 view_type: self.view_type,
2912 ref_counts: self.ref_counts.clone(),
2913 }
2914 }
2915}
2916
2917impl From<&AnyViewHandle> for AnyViewHandle {
2918 fn from(handle: &AnyViewHandle) -> Self {
2919 handle.clone()
2920 }
2921}
2922
2923impl<T: View> From<&ViewHandle<T>> for AnyViewHandle {
2924 fn from(handle: &ViewHandle<T>) -> Self {
2925 handle
2926 .ref_counts
2927 .lock()
2928 .inc_view(handle.window_id, handle.view_id);
2929 AnyViewHandle {
2930 window_id: handle.window_id,
2931 view_id: handle.view_id,
2932 view_type: TypeId::of::<T>(),
2933 ref_counts: handle.ref_counts.clone(),
2934 }
2935 }
2936}
2937
2938impl<T: View> From<ViewHandle<T>> for AnyViewHandle {
2939 fn from(handle: ViewHandle<T>) -> Self {
2940 let any_handle = AnyViewHandle {
2941 window_id: handle.window_id,
2942 view_id: handle.view_id,
2943 view_type: TypeId::of::<T>(),
2944 ref_counts: handle.ref_counts.clone(),
2945 };
2946 unsafe {
2947 Arc::decrement_strong_count(&handle.ref_counts);
2948 }
2949 std::mem::forget(handle);
2950 any_handle
2951 }
2952}
2953
2954impl Drop for AnyViewHandle {
2955 fn drop(&mut self) {
2956 self.ref_counts
2957 .lock()
2958 .dec_view(self.window_id, self.view_id);
2959 }
2960}
2961
2962pub struct AnyModelHandle {
2963 model_id: usize,
2964 ref_counts: Arc<Mutex<RefCounts>>,
2965}
2966
2967impl<T: Entity> From<ModelHandle<T>> for AnyModelHandle {
2968 fn from(handle: ModelHandle<T>) -> Self {
2969 handle.ref_counts.lock().inc_model(handle.model_id);
2970 Self {
2971 model_id: handle.model_id,
2972 ref_counts: handle.ref_counts.clone(),
2973 }
2974 }
2975}
2976
2977impl Drop for AnyModelHandle {
2978 fn drop(&mut self) {
2979 self.ref_counts.lock().dec_model(self.model_id);
2980 }
2981}
2982pub struct WeakViewHandle<T> {
2983 window_id: usize,
2984 view_id: usize,
2985 view_type: PhantomData<T>,
2986}
2987
2988impl<T: View> WeakViewHandle<T> {
2989 fn new(window_id: usize, view_id: usize) -> Self {
2990 Self {
2991 window_id,
2992 view_id,
2993 view_type: PhantomData,
2994 }
2995 }
2996
2997 pub fn id(&self) -> usize {
2998 self.view_id
2999 }
3000
3001 pub fn upgrade(&self, cx: &AppContext) -> Option<ViewHandle<T>> {
3002 if cx.ref_counts.lock().is_entity_alive(self.view_id) {
3003 Some(ViewHandle::new(
3004 self.window_id,
3005 self.view_id,
3006 &cx.ref_counts,
3007 ))
3008 } else {
3009 None
3010 }
3011 }
3012}
3013
3014impl<T> Clone for WeakViewHandle<T> {
3015 fn clone(&self) -> Self {
3016 Self {
3017 window_id: self.window_id,
3018 view_id: self.view_id,
3019 view_type: PhantomData,
3020 }
3021 }
3022}
3023
3024#[derive(Clone, Copy, PartialEq, Eq, Hash)]
3025pub struct ElementStateId(usize, usize);
3026
3027impl From<usize> for ElementStateId {
3028 fn from(id: usize) -> Self {
3029 Self(id, 0)
3030 }
3031}
3032
3033impl From<(usize, usize)> for ElementStateId {
3034 fn from(id: (usize, usize)) -> Self {
3035 Self(id.0, id.1)
3036 }
3037}
3038
3039pub struct ElementStateHandle<T> {
3040 value_type: PhantomData<T>,
3041 tag_type_id: TypeId,
3042 id: ElementStateId,
3043 ref_counts: Weak<Mutex<RefCounts>>,
3044}
3045
3046impl<T: 'static> ElementStateHandle<T> {
3047 fn new(tag_type_id: TypeId, id: ElementStateId, ref_counts: &Arc<Mutex<RefCounts>>) -> Self {
3048 ref_counts.lock().inc_element_state(tag_type_id, id);
3049 Self {
3050 value_type: PhantomData,
3051 tag_type_id,
3052 id,
3053 ref_counts: Arc::downgrade(ref_counts),
3054 }
3055 }
3056
3057 pub fn read<'a>(&self, cx: &'a AppContext) -> &'a T {
3058 cx.element_states
3059 .get(&(self.tag_type_id, self.id))
3060 .unwrap()
3061 .downcast_ref()
3062 .unwrap()
3063 }
3064
3065 pub fn update<C, R>(&self, cx: &mut C, f: impl FnOnce(&mut T, &mut C) -> R) -> R
3066 where
3067 C: DerefMut<Target = MutableAppContext>,
3068 {
3069 let mut element_state = cx
3070 .deref_mut()
3071 .cx
3072 .element_states
3073 .remove(&(self.tag_type_id, self.id))
3074 .unwrap();
3075 let result = f(element_state.downcast_mut().unwrap(), cx);
3076 cx.deref_mut()
3077 .cx
3078 .element_states
3079 .insert((self.tag_type_id, self.id), element_state);
3080 result
3081 }
3082}
3083
3084impl<T> Drop for ElementStateHandle<T> {
3085 fn drop(&mut self) {
3086 if let Some(ref_counts) = self.ref_counts.upgrade() {
3087 ref_counts
3088 .lock()
3089 .dec_element_state(self.tag_type_id, self.id);
3090 }
3091 }
3092}
3093
3094pub struct CursorStyleHandle {
3095 id: usize,
3096 next_cursor_style_handle_id: Arc<AtomicUsize>,
3097 platform: Arc<dyn Platform>,
3098}
3099
3100impl Drop for CursorStyleHandle {
3101 fn drop(&mut self) {
3102 if self.id + 1 == self.next_cursor_style_handle_id.load(SeqCst) {
3103 self.platform.set_cursor_style(CursorStyle::Arrow);
3104 }
3105 }
3106}
3107
3108#[must_use]
3109pub enum Subscription {
3110 Subscription {
3111 id: usize,
3112 entity_id: usize,
3113 subscriptions: Option<Weak<Mutex<HashMap<usize, BTreeMap<usize, SubscriptionCallback>>>>>,
3114 },
3115 Observation {
3116 id: usize,
3117 entity_id: usize,
3118 observations: Option<Weak<Mutex<HashMap<usize, BTreeMap<usize, ObservationCallback>>>>>,
3119 },
3120}
3121
3122impl Subscription {
3123 pub fn detach(&mut self) {
3124 match self {
3125 Subscription::Subscription { subscriptions, .. } => {
3126 subscriptions.take();
3127 }
3128 Subscription::Observation { observations, .. } => {
3129 observations.take();
3130 }
3131 }
3132 }
3133}
3134
3135impl Drop for Subscription {
3136 fn drop(&mut self) {
3137 match self {
3138 Subscription::Observation {
3139 id,
3140 entity_id,
3141 observations,
3142 } => {
3143 if let Some(observations) = observations.as_ref().and_then(Weak::upgrade) {
3144 if let Some(observations) = observations.lock().get_mut(entity_id) {
3145 observations.remove(id);
3146 }
3147 }
3148 }
3149 Subscription::Subscription {
3150 id,
3151 entity_id,
3152 subscriptions,
3153 } => {
3154 if let Some(subscriptions) = subscriptions.as_ref().and_then(Weak::upgrade) {
3155 if let Some(subscriptions) = subscriptions.lock().get_mut(entity_id) {
3156 subscriptions.remove(id);
3157 }
3158 }
3159 }
3160 }
3161 }
3162}
3163
3164#[derive(Default)]
3165struct RefCounts {
3166 entity_counts: HashMap<usize, usize>,
3167 element_state_counts: HashMap<(TypeId, ElementStateId), usize>,
3168 dropped_models: HashSet<usize>,
3169 dropped_views: HashSet<(usize, usize)>,
3170 dropped_element_states: HashSet<(TypeId, ElementStateId)>,
3171}
3172
3173impl RefCounts {
3174 fn inc_model(&mut self, model_id: usize) {
3175 match self.entity_counts.entry(model_id) {
3176 Entry::Occupied(mut entry) => *entry.get_mut() += 1,
3177 Entry::Vacant(entry) => {
3178 entry.insert(1);
3179 self.dropped_models.remove(&model_id);
3180 }
3181 }
3182 }
3183
3184 fn inc_view(&mut self, window_id: usize, view_id: usize) {
3185 match self.entity_counts.entry(view_id) {
3186 Entry::Occupied(mut entry) => *entry.get_mut() += 1,
3187 Entry::Vacant(entry) => {
3188 entry.insert(1);
3189 self.dropped_views.remove(&(window_id, view_id));
3190 }
3191 }
3192 }
3193
3194 fn inc_element_state(&mut self, tag_type_id: TypeId, id: ElementStateId) {
3195 match self.element_state_counts.entry((tag_type_id, id)) {
3196 Entry::Occupied(mut entry) => *entry.get_mut() += 1,
3197 Entry::Vacant(entry) => {
3198 entry.insert(1);
3199 self.dropped_element_states.remove(&(tag_type_id, id));
3200 }
3201 }
3202 }
3203
3204 fn dec_model(&mut self, model_id: usize) {
3205 let count = self.entity_counts.get_mut(&model_id).unwrap();
3206 *count -= 1;
3207 if *count == 0 {
3208 self.entity_counts.remove(&model_id);
3209 self.dropped_models.insert(model_id);
3210 }
3211 }
3212
3213 fn dec_view(&mut self, window_id: usize, view_id: usize) {
3214 let count = self.entity_counts.get_mut(&view_id).unwrap();
3215 *count -= 1;
3216 if *count == 0 {
3217 self.entity_counts.remove(&view_id);
3218 self.dropped_views.insert((window_id, view_id));
3219 }
3220 }
3221
3222 fn dec_element_state(&mut self, tag_type_id: TypeId, id: ElementStateId) {
3223 let key = (tag_type_id, id);
3224 let count = self.element_state_counts.get_mut(&key).unwrap();
3225 *count -= 1;
3226 if *count == 0 {
3227 self.element_state_counts.remove(&key);
3228 self.dropped_element_states.insert(key);
3229 }
3230 }
3231
3232 fn is_entity_alive(&self, entity_id: usize) -> bool {
3233 self.entity_counts.contains_key(&entity_id)
3234 }
3235
3236 fn take_dropped(
3237 &mut self,
3238 ) -> (
3239 HashSet<usize>,
3240 HashSet<(usize, usize)>,
3241 HashSet<(TypeId, ElementStateId)>,
3242 ) {
3243 let mut dropped_models = HashSet::new();
3244 let mut dropped_views = HashSet::new();
3245 let mut dropped_element_states = HashSet::new();
3246 std::mem::swap(&mut self.dropped_models, &mut dropped_models);
3247 std::mem::swap(&mut self.dropped_views, &mut dropped_views);
3248 std::mem::swap(
3249 &mut self.dropped_element_states,
3250 &mut dropped_element_states,
3251 );
3252 (dropped_models, dropped_views, dropped_element_states)
3253 }
3254}
3255
3256#[cfg(test)]
3257mod tests {
3258 use super::*;
3259 use crate::elements::*;
3260 use smol::future::poll_once;
3261 use std::sync::atomic::{AtomicUsize, Ordering::SeqCst};
3262
3263 #[crate::test(self)]
3264 fn test_model_handles(cx: &mut MutableAppContext) {
3265 struct Model {
3266 other: Option<ModelHandle<Model>>,
3267 events: Vec<String>,
3268 }
3269
3270 impl Entity for Model {
3271 type Event = usize;
3272 }
3273
3274 impl Model {
3275 fn new(other: Option<ModelHandle<Self>>, cx: &mut ModelContext<Self>) -> Self {
3276 if let Some(other) = other.as_ref() {
3277 cx.observe(other, |me, _, _| {
3278 me.events.push("notified".into());
3279 })
3280 .detach();
3281 cx.subscribe(other, |me, _, event, _| {
3282 me.events.push(format!("observed event {}", event));
3283 })
3284 .detach();
3285 }
3286
3287 Self {
3288 other,
3289 events: Vec::new(),
3290 }
3291 }
3292 }
3293
3294 let handle_1 = cx.add_model(|cx| Model::new(None, cx));
3295 let handle_2 = cx.add_model(|cx| Model::new(Some(handle_1.clone()), cx));
3296 assert_eq!(cx.cx.models.len(), 2);
3297
3298 handle_1.update(cx, |model, cx| {
3299 model.events.push("updated".into());
3300 cx.emit(1);
3301 cx.notify();
3302 cx.emit(2);
3303 });
3304 assert_eq!(handle_1.read(cx).events, vec!["updated".to_string()]);
3305 assert_eq!(
3306 handle_2.read(cx).events,
3307 vec![
3308 "observed event 1".to_string(),
3309 "notified".to_string(),
3310 "observed event 2".to_string(),
3311 ]
3312 );
3313
3314 handle_2.update(cx, |model, _| {
3315 drop(handle_1);
3316 model.other.take();
3317 });
3318
3319 assert_eq!(cx.cx.models.len(), 1);
3320 assert!(cx.subscriptions.lock().is_empty());
3321 assert!(cx.observations.lock().is_empty());
3322 }
3323
3324 #[crate::test(self)]
3325 fn test_subscribe_and_emit_from_model(cx: &mut MutableAppContext) {
3326 #[derive(Default)]
3327 struct Model {
3328 events: Vec<usize>,
3329 }
3330
3331 impl Entity for Model {
3332 type Event = usize;
3333 }
3334
3335 let handle_1 = cx.add_model(|_| Model::default());
3336 let handle_2 = cx.add_model(|_| Model::default());
3337 let handle_2b = handle_2.clone();
3338
3339 handle_1.update(cx, |_, c| {
3340 c.subscribe(&handle_2, move |model: &mut Model, _, event, c| {
3341 model.events.push(*event);
3342
3343 c.subscribe(&handle_2b, |model, _, event, _| {
3344 model.events.push(*event * 2);
3345 })
3346 .detach();
3347 })
3348 .detach();
3349 });
3350
3351 handle_2.update(cx, |_, c| c.emit(7));
3352 assert_eq!(handle_1.read(cx).events, vec![7]);
3353
3354 handle_2.update(cx, |_, c| c.emit(5));
3355 assert_eq!(handle_1.read(cx).events, vec![7, 5, 10]);
3356 }
3357
3358 #[crate::test(self)]
3359 fn test_observe_and_notify_from_model(cx: &mut MutableAppContext) {
3360 #[derive(Default)]
3361 struct Model {
3362 count: usize,
3363 events: Vec<usize>,
3364 }
3365
3366 impl Entity for Model {
3367 type Event = ();
3368 }
3369
3370 let handle_1 = cx.add_model(|_| Model::default());
3371 let handle_2 = cx.add_model(|_| Model::default());
3372 let handle_2b = handle_2.clone();
3373
3374 handle_1.update(cx, |_, c| {
3375 c.observe(&handle_2, move |model, observed, c| {
3376 model.events.push(observed.read(c).count);
3377 c.observe(&handle_2b, |model, observed, c| {
3378 model.events.push(observed.read(c).count * 2);
3379 })
3380 .detach();
3381 })
3382 .detach();
3383 });
3384
3385 handle_2.update(cx, |model, c| {
3386 model.count = 7;
3387 c.notify()
3388 });
3389 assert_eq!(handle_1.read(cx).events, vec![7]);
3390
3391 handle_2.update(cx, |model, c| {
3392 model.count = 5;
3393 c.notify()
3394 });
3395 assert_eq!(handle_1.read(cx).events, vec![7, 5, 10])
3396 }
3397
3398 #[crate::test(self)]
3399 fn test_view_handles(cx: &mut MutableAppContext) {
3400 struct View {
3401 other: Option<ViewHandle<View>>,
3402 events: Vec<String>,
3403 }
3404
3405 impl Entity for View {
3406 type Event = usize;
3407 }
3408
3409 impl super::View for View {
3410 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
3411 Empty::new().boxed()
3412 }
3413
3414 fn ui_name() -> &'static str {
3415 "View"
3416 }
3417 }
3418
3419 impl View {
3420 fn new(other: Option<ViewHandle<View>>, cx: &mut ViewContext<Self>) -> Self {
3421 if let Some(other) = other.as_ref() {
3422 cx.subscribe(other, |me, _, event, _| {
3423 me.events.push(format!("observed event {}", event));
3424 })
3425 .detach();
3426 }
3427 Self {
3428 other,
3429 events: Vec::new(),
3430 }
3431 }
3432 }
3433
3434 let (window_id, _) = cx.add_window(Default::default(), |cx| View::new(None, cx));
3435 let handle_1 = cx.add_view(window_id, |cx| View::new(None, cx));
3436 let handle_2 = cx.add_view(window_id, |cx| View::new(Some(handle_1.clone()), cx));
3437 assert_eq!(cx.cx.views.len(), 3);
3438
3439 handle_1.update(cx, |view, cx| {
3440 view.events.push("updated".into());
3441 cx.emit(1);
3442 cx.emit(2);
3443 });
3444 assert_eq!(handle_1.read(cx).events, vec!["updated".to_string()]);
3445 assert_eq!(
3446 handle_2.read(cx).events,
3447 vec![
3448 "observed event 1".to_string(),
3449 "observed event 2".to_string(),
3450 ]
3451 );
3452
3453 handle_2.update(cx, |view, _| {
3454 drop(handle_1);
3455 view.other.take();
3456 });
3457
3458 assert_eq!(cx.cx.views.len(), 2);
3459 assert!(cx.subscriptions.lock().is_empty());
3460 assert!(cx.observations.lock().is_empty());
3461 }
3462
3463 #[crate::test(self)]
3464 fn test_add_window(cx: &mut MutableAppContext) {
3465 struct View {
3466 mouse_down_count: Arc<AtomicUsize>,
3467 }
3468
3469 impl Entity for View {
3470 type Event = ();
3471 }
3472
3473 impl super::View for View {
3474 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
3475 let mouse_down_count = self.mouse_down_count.clone();
3476 EventHandler::new(Empty::new().boxed())
3477 .on_mouse_down(move |_| {
3478 mouse_down_count.fetch_add(1, SeqCst);
3479 true
3480 })
3481 .boxed()
3482 }
3483
3484 fn ui_name() -> &'static str {
3485 "View"
3486 }
3487 }
3488
3489 let mouse_down_count = Arc::new(AtomicUsize::new(0));
3490 let (window_id, _) = cx.add_window(Default::default(), |_| View {
3491 mouse_down_count: mouse_down_count.clone(),
3492 });
3493 let presenter = cx.presenters_and_platform_windows[&window_id].0.clone();
3494 // Ensure window's root element is in a valid lifecycle state.
3495 presenter.borrow_mut().dispatch_event(
3496 Event::LeftMouseDown {
3497 position: Default::default(),
3498 cmd: false,
3499 },
3500 cx,
3501 );
3502 assert_eq!(mouse_down_count.load(SeqCst), 1);
3503 }
3504
3505 #[crate::test(self)]
3506 fn test_entity_release_hooks(cx: &mut MutableAppContext) {
3507 struct Model {
3508 released: Arc<Mutex<bool>>,
3509 }
3510
3511 struct View {
3512 released: Arc<Mutex<bool>>,
3513 }
3514
3515 impl Entity for Model {
3516 type Event = ();
3517
3518 fn release(&mut self, _: &mut MutableAppContext) {
3519 *self.released.lock() = true;
3520 }
3521 }
3522
3523 impl Entity for View {
3524 type Event = ();
3525
3526 fn release(&mut self, _: &mut MutableAppContext) {
3527 *self.released.lock() = true;
3528 }
3529 }
3530
3531 impl super::View for View {
3532 fn ui_name() -> &'static str {
3533 "View"
3534 }
3535
3536 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
3537 Empty::new().boxed()
3538 }
3539 }
3540
3541 let model_released = Arc::new(Mutex::new(false));
3542 let view_released = Arc::new(Mutex::new(false));
3543
3544 let model = cx.add_model(|_| Model {
3545 released: model_released.clone(),
3546 });
3547
3548 let (window_id, _) = cx.add_window(Default::default(), |_| View {
3549 released: view_released.clone(),
3550 });
3551
3552 assert!(!*model_released.lock());
3553 assert!(!*view_released.lock());
3554
3555 cx.update(move || {
3556 drop(model);
3557 });
3558 assert!(*model_released.lock());
3559
3560 drop(cx.remove_window(window_id));
3561 assert!(*view_released.lock());
3562 }
3563
3564 #[crate::test(self)]
3565 fn test_subscribe_and_emit_from_view(cx: &mut MutableAppContext) {
3566 #[derive(Default)]
3567 struct View {
3568 events: Vec<usize>,
3569 }
3570
3571 impl Entity for View {
3572 type Event = usize;
3573 }
3574
3575 impl super::View for View {
3576 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
3577 Empty::new().boxed()
3578 }
3579
3580 fn ui_name() -> &'static str {
3581 "View"
3582 }
3583 }
3584
3585 struct Model;
3586
3587 impl Entity for Model {
3588 type Event = usize;
3589 }
3590
3591 let (window_id, handle_1) = cx.add_window(Default::default(), |_| View::default());
3592 let handle_2 = cx.add_view(window_id, |_| View::default());
3593 let handle_2b = handle_2.clone();
3594 let handle_3 = cx.add_model(|_| Model);
3595
3596 handle_1.update(cx, |_, c| {
3597 c.subscribe(&handle_2, move |me, _, event, c| {
3598 me.events.push(*event);
3599
3600 c.subscribe(&handle_2b, |me, _, event, _| {
3601 me.events.push(*event * 2);
3602 })
3603 .detach();
3604 })
3605 .detach();
3606
3607 c.subscribe(&handle_3, |me, _, event, _| {
3608 me.events.push(*event);
3609 })
3610 .detach();
3611 });
3612
3613 handle_2.update(cx, |_, c| c.emit(7));
3614 assert_eq!(handle_1.read(cx).events, vec![7]);
3615
3616 handle_2.update(cx, |_, c| c.emit(5));
3617 assert_eq!(handle_1.read(cx).events, vec![7, 5, 10]);
3618
3619 handle_3.update(cx, |_, c| c.emit(9));
3620 assert_eq!(handle_1.read(cx).events, vec![7, 5, 10, 9]);
3621 }
3622
3623 #[crate::test(self)]
3624 fn test_dropping_subscribers(cx: &mut MutableAppContext) {
3625 struct View;
3626
3627 impl Entity for View {
3628 type Event = ();
3629 }
3630
3631 impl super::View for View {
3632 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
3633 Empty::new().boxed()
3634 }
3635
3636 fn ui_name() -> &'static str {
3637 "View"
3638 }
3639 }
3640
3641 struct Model;
3642
3643 impl Entity for Model {
3644 type Event = ();
3645 }
3646
3647 let (window_id, _) = cx.add_window(Default::default(), |_| View);
3648 let observing_view = cx.add_view(window_id, |_| View);
3649 let emitting_view = cx.add_view(window_id, |_| View);
3650 let observing_model = cx.add_model(|_| Model);
3651 let observed_model = cx.add_model(|_| Model);
3652
3653 observing_view.update(cx, |_, cx| {
3654 cx.subscribe(&emitting_view, |_, _, _, _| {}).detach();
3655 cx.subscribe(&observed_model, |_, _, _, _| {}).detach();
3656 });
3657 observing_model.update(cx, |_, cx| {
3658 cx.subscribe(&observed_model, |_, _, _, _| {}).detach();
3659 });
3660
3661 cx.update(|| {
3662 drop(observing_view);
3663 drop(observing_model);
3664 });
3665
3666 emitting_view.update(cx, |_, cx| cx.emit(()));
3667 observed_model.update(cx, |_, cx| cx.emit(()));
3668 }
3669
3670 #[crate::test(self)]
3671 fn test_observe_and_notify_from_view(cx: &mut MutableAppContext) {
3672 #[derive(Default)]
3673 struct View {
3674 events: Vec<usize>,
3675 }
3676
3677 impl Entity for View {
3678 type Event = usize;
3679 }
3680
3681 impl super::View for View {
3682 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
3683 Empty::new().boxed()
3684 }
3685
3686 fn ui_name() -> &'static str {
3687 "View"
3688 }
3689 }
3690
3691 #[derive(Default)]
3692 struct Model {
3693 count: usize,
3694 }
3695
3696 impl Entity for Model {
3697 type Event = ();
3698 }
3699
3700 let (_, view) = cx.add_window(Default::default(), |_| View::default());
3701 let model = cx.add_model(|_| Model::default());
3702
3703 view.update(cx, |_, c| {
3704 c.observe(&model, |me, observed, c| {
3705 me.events.push(observed.read(c).count)
3706 })
3707 .detach();
3708 });
3709
3710 model.update(cx, |model, c| {
3711 model.count = 11;
3712 c.notify();
3713 });
3714 assert_eq!(view.read(cx).events, vec![11]);
3715 }
3716
3717 #[crate::test(self)]
3718 fn test_dropping_observers(cx: &mut MutableAppContext) {
3719 struct View;
3720
3721 impl Entity for View {
3722 type Event = ();
3723 }
3724
3725 impl super::View for View {
3726 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
3727 Empty::new().boxed()
3728 }
3729
3730 fn ui_name() -> &'static str {
3731 "View"
3732 }
3733 }
3734
3735 struct Model;
3736
3737 impl Entity for Model {
3738 type Event = ();
3739 }
3740
3741 let (window_id, _) = cx.add_window(Default::default(), |_| View);
3742 let observing_view = cx.add_view(window_id, |_| View);
3743 let observing_model = cx.add_model(|_| Model);
3744 let observed_model = cx.add_model(|_| Model);
3745
3746 observing_view.update(cx, |_, cx| {
3747 cx.observe(&observed_model, |_, _, _| {}).detach();
3748 });
3749 observing_model.update(cx, |_, cx| {
3750 cx.observe(&observed_model, |_, _, _| {}).detach();
3751 });
3752
3753 cx.update(|| {
3754 drop(observing_view);
3755 drop(observing_model);
3756 });
3757
3758 observed_model.update(cx, |_, cx| cx.notify());
3759 }
3760
3761 #[crate::test(self)]
3762 fn test_focus(cx: &mut MutableAppContext) {
3763 struct View {
3764 name: String,
3765 events: Arc<Mutex<Vec<String>>>,
3766 }
3767
3768 impl Entity for View {
3769 type Event = ();
3770 }
3771
3772 impl super::View for View {
3773 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
3774 Empty::new().boxed()
3775 }
3776
3777 fn ui_name() -> &'static str {
3778 "View"
3779 }
3780
3781 fn on_focus(&mut self, _: &mut ViewContext<Self>) {
3782 self.events.lock().push(format!("{} focused", &self.name));
3783 }
3784
3785 fn on_blur(&mut self, _: &mut ViewContext<Self>) {
3786 self.events.lock().push(format!("{} blurred", &self.name));
3787 }
3788 }
3789
3790 let events: Arc<Mutex<Vec<String>>> = Default::default();
3791 let (window_id, view_1) = cx.add_window(Default::default(), |_| View {
3792 events: events.clone(),
3793 name: "view 1".to_string(),
3794 });
3795 let view_2 = cx.add_view(window_id, |_| View {
3796 events: events.clone(),
3797 name: "view 2".to_string(),
3798 });
3799
3800 view_1.update(cx, |_, cx| cx.focus(&view_2));
3801 view_1.update(cx, |_, cx| cx.focus(&view_1));
3802 view_1.update(cx, |_, cx| cx.focus(&view_2));
3803 view_1.update(cx, |_, _| drop(view_2));
3804
3805 assert_eq!(
3806 *events.lock(),
3807 [
3808 "view 1 focused".to_string(),
3809 "view 1 blurred".to_string(),
3810 "view 2 focused".to_string(),
3811 "view 2 blurred".to_string(),
3812 "view 1 focused".to_string(),
3813 "view 1 blurred".to_string(),
3814 "view 2 focused".to_string(),
3815 "view 1 focused".to_string(),
3816 ],
3817 );
3818 }
3819
3820 #[crate::test(self)]
3821 fn test_dispatch_action(cx: &mut MutableAppContext) {
3822 struct ViewA {
3823 id: usize,
3824 }
3825
3826 impl Entity for ViewA {
3827 type Event = ();
3828 }
3829
3830 impl View for ViewA {
3831 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
3832 Empty::new().boxed()
3833 }
3834
3835 fn ui_name() -> &'static str {
3836 "View"
3837 }
3838 }
3839
3840 struct ViewB {
3841 id: usize,
3842 }
3843
3844 impl Entity for ViewB {
3845 type Event = ();
3846 }
3847
3848 impl View for ViewB {
3849 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
3850 Empty::new().boxed()
3851 }
3852
3853 fn ui_name() -> &'static str {
3854 "View"
3855 }
3856 }
3857
3858 action!(Action, &'static str);
3859
3860 let actions = Rc::new(RefCell::new(Vec::new()));
3861
3862 let actions_clone = actions.clone();
3863 cx.add_global_action(move |_: &Action, _: &mut MutableAppContext| {
3864 actions_clone.borrow_mut().push("global a".to_string());
3865 });
3866
3867 let actions_clone = actions.clone();
3868 cx.add_global_action(move |_: &Action, _: &mut MutableAppContext| {
3869 actions_clone.borrow_mut().push("global b".to_string());
3870 });
3871
3872 let actions_clone = actions.clone();
3873 cx.add_action(move |view: &mut ViewA, action: &Action, cx| {
3874 assert_eq!(action.0, "bar");
3875 cx.propagate_action();
3876 actions_clone.borrow_mut().push(format!("{} a", view.id));
3877 });
3878
3879 let actions_clone = actions.clone();
3880 cx.add_action(move |view: &mut ViewA, _: &Action, cx| {
3881 if view.id != 1 {
3882 cx.propagate_action();
3883 }
3884 actions_clone.borrow_mut().push(format!("{} b", view.id));
3885 });
3886
3887 let actions_clone = actions.clone();
3888 cx.add_action(move |view: &mut ViewB, _: &Action, cx| {
3889 cx.propagate_action();
3890 actions_clone.borrow_mut().push(format!("{} c", view.id));
3891 });
3892
3893 let actions_clone = actions.clone();
3894 cx.add_action(move |view: &mut ViewB, _: &Action, cx| {
3895 cx.propagate_action();
3896 actions_clone.borrow_mut().push(format!("{} d", view.id));
3897 });
3898
3899 let (window_id, view_1) = cx.add_window(Default::default(), |_| ViewA { id: 1 });
3900 let view_2 = cx.add_view(window_id, |_| ViewB { id: 2 });
3901 let view_3 = cx.add_view(window_id, |_| ViewA { id: 3 });
3902 let view_4 = cx.add_view(window_id, |_| ViewB { id: 4 });
3903
3904 cx.dispatch_action(
3905 window_id,
3906 vec![view_1.id(), view_2.id(), view_3.id(), view_4.id()],
3907 &Action("bar"),
3908 );
3909
3910 assert_eq!(
3911 *actions.borrow(),
3912 vec!["4 d", "4 c", "3 b", "3 a", "2 d", "2 c", "1 b"]
3913 );
3914
3915 // Remove view_1, which doesn't propagate the action
3916 actions.borrow_mut().clear();
3917 cx.dispatch_action(
3918 window_id,
3919 vec![view_2.id(), view_3.id(), view_4.id()],
3920 &Action("bar"),
3921 );
3922
3923 assert_eq!(
3924 *actions.borrow(),
3925 vec!["4 d", "4 c", "3 b", "3 a", "2 d", "2 c", "global b", "global a"]
3926 );
3927 }
3928
3929 #[crate::test(self)]
3930 fn test_dispatch_keystroke(cx: &mut MutableAppContext) {
3931 use std::cell::Cell;
3932
3933 action!(Action, &'static str);
3934
3935 struct View {
3936 id: usize,
3937 keymap_context: keymap::Context,
3938 }
3939
3940 impl Entity for View {
3941 type Event = ();
3942 }
3943
3944 impl super::View for View {
3945 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
3946 Empty::new().boxed()
3947 }
3948
3949 fn ui_name() -> &'static str {
3950 "View"
3951 }
3952
3953 fn keymap_context(&self, _: &AppContext) -> keymap::Context {
3954 self.keymap_context.clone()
3955 }
3956 }
3957
3958 impl View {
3959 fn new(id: usize) -> Self {
3960 View {
3961 id,
3962 keymap_context: keymap::Context::default(),
3963 }
3964 }
3965 }
3966
3967 let mut view_1 = View::new(1);
3968 let mut view_2 = View::new(2);
3969 let mut view_3 = View::new(3);
3970 view_1.keymap_context.set.insert("a".into());
3971 view_2.keymap_context.set.insert("b".into());
3972 view_3.keymap_context.set.insert("c".into());
3973
3974 let (window_id, view_1) = cx.add_window(Default::default(), |_| view_1);
3975 let view_2 = cx.add_view(window_id, |_| view_2);
3976 let view_3 = cx.add_view(window_id, |_| view_3);
3977
3978 // This keymap's only binding dispatches an action on view 2 because that view will have
3979 // "a" and "b" in its context, but not "c".
3980 cx.add_bindings(vec![keymap::Binding::new(
3981 "a",
3982 Action("a"),
3983 Some("a && b && !c"),
3984 )]);
3985
3986 let handled_action = Rc::new(Cell::new(false));
3987 let handled_action_clone = handled_action.clone();
3988 cx.add_action(move |view: &mut View, action: &Action, _| {
3989 handled_action_clone.set(true);
3990 assert_eq!(view.id, 2);
3991 assert_eq!(action.0, "a");
3992 });
3993
3994 cx.dispatch_keystroke(
3995 window_id,
3996 vec![view_1.id(), view_2.id(), view_3.id()],
3997 &Keystroke::parse("a").unwrap(),
3998 )
3999 .unwrap();
4000
4001 assert!(handled_action.get());
4002 }
4003
4004 #[crate::test(self)]
4005 async fn test_model_condition(mut cx: TestAppContext) {
4006 struct Counter(usize);
4007
4008 impl super::Entity for Counter {
4009 type Event = ();
4010 }
4011
4012 impl Counter {
4013 fn inc(&mut self, cx: &mut ModelContext<Self>) {
4014 self.0 += 1;
4015 cx.notify();
4016 }
4017 }
4018
4019 let model = cx.add_model(|_| Counter(0));
4020
4021 let condition1 = model.condition(&cx, |model, _| model.0 == 2);
4022 let condition2 = model.condition(&cx, |model, _| model.0 == 3);
4023 smol::pin!(condition1, condition2);
4024
4025 model.update(&mut cx, |model, cx| model.inc(cx));
4026 assert_eq!(poll_once(&mut condition1).await, None);
4027 assert_eq!(poll_once(&mut condition2).await, None);
4028
4029 model.update(&mut cx, |model, cx| model.inc(cx));
4030 assert_eq!(poll_once(&mut condition1).await, Some(()));
4031 assert_eq!(poll_once(&mut condition2).await, None);
4032
4033 model.update(&mut cx, |model, cx| model.inc(cx));
4034 assert_eq!(poll_once(&mut condition2).await, Some(()));
4035
4036 model.update(&mut cx, |_, cx| cx.notify());
4037 }
4038
4039 #[crate::test(self)]
4040 #[should_panic]
4041 async fn test_model_condition_timeout(mut cx: TestAppContext) {
4042 struct Model;
4043
4044 impl super::Entity for Model {
4045 type Event = ();
4046 }
4047
4048 let model = cx.add_model(|_| Model);
4049 model.condition(&cx, |_, _| false).await;
4050 }
4051
4052 #[crate::test(self)]
4053 #[should_panic(expected = "model dropped with pending condition")]
4054 async fn test_model_condition_panic_on_drop(mut cx: TestAppContext) {
4055 struct Model;
4056
4057 impl super::Entity for Model {
4058 type Event = ();
4059 }
4060
4061 let model = cx.add_model(|_| Model);
4062 let condition = model.condition(&cx, |_, _| false);
4063 cx.update(|_| drop(model));
4064 condition.await;
4065 }
4066
4067 #[crate::test(self)]
4068 async fn test_view_condition(mut cx: TestAppContext) {
4069 struct Counter(usize);
4070
4071 impl super::Entity for Counter {
4072 type Event = ();
4073 }
4074
4075 impl super::View for Counter {
4076 fn ui_name() -> &'static str {
4077 "test view"
4078 }
4079
4080 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
4081 Empty::new().boxed()
4082 }
4083 }
4084
4085 impl Counter {
4086 fn inc(&mut self, cx: &mut ViewContext<Self>) {
4087 self.0 += 1;
4088 cx.notify();
4089 }
4090 }
4091
4092 let (_, view) = cx.add_window(|_| Counter(0));
4093
4094 let condition1 = view.condition(&cx, |view, _| view.0 == 2);
4095 let condition2 = view.condition(&cx, |view, _| view.0 == 3);
4096 smol::pin!(condition1, condition2);
4097
4098 view.update(&mut cx, |view, cx| view.inc(cx));
4099 assert_eq!(poll_once(&mut condition1).await, None);
4100 assert_eq!(poll_once(&mut condition2).await, None);
4101
4102 view.update(&mut cx, |view, cx| view.inc(cx));
4103 assert_eq!(poll_once(&mut condition1).await, Some(()));
4104 assert_eq!(poll_once(&mut condition2).await, None);
4105
4106 view.update(&mut cx, |view, cx| view.inc(cx));
4107 assert_eq!(poll_once(&mut condition2).await, Some(()));
4108 view.update(&mut cx, |_, cx| cx.notify());
4109 }
4110
4111 #[crate::test(self)]
4112 #[should_panic]
4113 async fn test_view_condition_timeout(mut cx: TestAppContext) {
4114 struct View;
4115
4116 impl super::Entity for View {
4117 type Event = ();
4118 }
4119
4120 impl super::View for View {
4121 fn ui_name() -> &'static str {
4122 "test view"
4123 }
4124
4125 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
4126 Empty::new().boxed()
4127 }
4128 }
4129
4130 let (_, view) = cx.add_window(|_| View);
4131 view.condition(&cx, |_, _| false).await;
4132 }
4133
4134 #[crate::test(self)]
4135 #[should_panic(expected = "view dropped with pending condition")]
4136 async fn test_view_condition_panic_on_drop(mut cx: TestAppContext) {
4137 struct View;
4138
4139 impl super::Entity for View {
4140 type Event = ();
4141 }
4142
4143 impl super::View for View {
4144 fn ui_name() -> &'static str {
4145 "test view"
4146 }
4147
4148 fn render(&mut self, _: &mut RenderContext<Self>) -> ElementBox {
4149 Empty::new().boxed()
4150 }
4151 }
4152
4153 let window_id = cx.add_window(|_| View).0;
4154 let view = cx.add_view(window_id, |_| View);
4155
4156 let condition = view.condition(&cx, |_, _| false);
4157 cx.update(|_| drop(view));
4158 condition.await;
4159 }
4160}