1use crate::{
2 elements::ElementBox,
3 executor,
4 keymap::{self, Keystroke},
5 platform::{self, WindowOptions},
6 presenter::Presenter,
7 util::{post_inc, timeout},
8 AssetCache, AssetSource, ClipboardItem, FontCache, PathPromptOptions, TextLayoutCache,
9};
10use anyhow::{anyhow, Result};
11use keymap::MatchResult;
12use parking_lot::{Mutex, RwLock};
13use pathfinder_geometry::{rect::RectF, vector::vec2f};
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::{HashMap, HashSet, VecDeque},
21 fmt::{self, Debug},
22 hash::{Hash, Hasher},
23 marker::PhantomData,
24 path::{Path, PathBuf},
25 rc::{self, Rc},
26 sync::{Arc, Weak},
27 time::Duration,
28};
29
30pub trait Entity: 'static + Send + Sync {
31 type Event;
32}
33
34pub trait View: Entity {
35 fn ui_name() -> &'static str;
36 fn render<'a>(&self, app: &AppContext) -> ElementBox;
37 fn on_focus(&mut self, _ctx: &mut ViewContext<Self>) {}
38 fn on_blur(&mut self, _ctx: &mut ViewContext<Self>) {}
39 fn keymap_context(&self, _: &AppContext) -> keymap::Context {
40 Self::default_keymap_context()
41 }
42 fn default_keymap_context() -> keymap::Context {
43 let mut ctx = keymap::Context::default();
44 ctx.set.insert(Self::ui_name().into());
45 ctx
46 }
47}
48
49pub trait ReadModel {
50 fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T;
51}
52
53pub trait UpdateModel {
54 fn update_model<T, F, S>(&mut self, handle: &ModelHandle<T>, update: F) -> S
55 where
56 T: Entity,
57 F: FnOnce(&mut T, &mut ModelContext<T>) -> S;
58}
59
60pub trait ReadView {
61 fn read_view<T: View>(&self, handle: &ViewHandle<T>) -> &T;
62}
63
64pub trait UpdateView {
65 fn update_view<T, F, S>(&mut self, handle: &ViewHandle<T>, update: F) -> S
66 where
67 T: View,
68 F: FnOnce(&mut T, &mut ViewContext<T>) -> S;
69}
70
71pub struct Menu<'a> {
72 pub name: &'a str,
73 pub items: Vec<MenuItem<'a>>,
74}
75
76pub enum MenuItem<'a> {
77 Action {
78 name: &'a str,
79 keystroke: Option<&'a str>,
80 action: &'a str,
81 arg: Option<Box<dyn Any + 'static>>,
82 },
83 Separator,
84}
85
86#[derive(Clone)]
87pub struct App(Rc<RefCell<MutableAppContext>>);
88
89#[derive(Clone)]
90pub struct TestAppContext(Rc<RefCell<MutableAppContext>>, Rc<platform::test::Platform>);
91
92impl App {
93 pub fn test<T, A: AssetSource, F: FnOnce(&mut MutableAppContext) -> T>(
94 asset_source: A,
95 f: F,
96 ) -> T {
97 let platform = platform::test::platform();
98 let foreground = Rc::new(executor::Foreground::test());
99 let ctx = Rc::new(RefCell::new(MutableAppContext::new(
100 foreground,
101 Rc::new(platform),
102 asset_source,
103 )));
104 ctx.borrow_mut().weak_self = Some(Rc::downgrade(&ctx));
105 let mut ctx = ctx.borrow_mut();
106 f(&mut *ctx)
107 }
108
109 pub fn test_async<T, F, A: AssetSource, Fn>(asset_source: A, f: Fn) -> T
110 where
111 Fn: FnOnce(TestAppContext) -> F,
112 F: Future<Output = T>,
113 {
114 let platform = Rc::new(platform::test::platform());
115 let foreground = Rc::new(executor::Foreground::test());
116 let ctx = TestAppContext(
117 Rc::new(RefCell::new(MutableAppContext::new(
118 foreground.clone(),
119 platform.clone(),
120 asset_source,
121 ))),
122 platform,
123 );
124 ctx.0.borrow_mut().weak_self = Some(Rc::downgrade(&ctx.0));
125
126 let future = f(ctx);
127 smol::block_on(foreground.run(future))
128 }
129
130 pub fn new(asset_source: impl AssetSource) -> Result<Self> {
131 let platform = platform::current::platform();
132 let foreground = Rc::new(executor::Foreground::platform(platform.dispatcher())?);
133 let app = Self(Rc::new(RefCell::new(MutableAppContext::new(
134 foreground,
135 platform.clone(),
136 asset_source,
137 ))));
138
139 let ctx = app.0.clone();
140 platform.on_menu_command(Box::new(move |command, arg| {
141 let mut ctx = ctx.borrow_mut();
142 if let Some(key_window_id) = ctx.platform.key_window_id() {
143 if let Some((presenter, _)) =
144 ctx.presenters_and_platform_windows.get(&key_window_id)
145 {
146 let presenter = presenter.clone();
147 let path = presenter.borrow().dispatch_path(ctx.as_ref());
148 ctx.dispatch_action_any(key_window_id, &path, command, arg.unwrap_or(&()));
149 } else {
150 ctx.dispatch_global_action_any(command, arg.unwrap_or(&()));
151 }
152 } else {
153 ctx.dispatch_global_action_any(command, arg.unwrap_or(&()));
154 }
155 }));
156
157 app.0.borrow_mut().weak_self = Some(Rc::downgrade(&app.0));
158 Ok(app)
159 }
160
161 pub fn on_become_active<F>(self, mut callback: F) -> Self
162 where
163 F: 'static + FnMut(&mut MutableAppContext),
164 {
165 let ctx = self.0.clone();
166 self.0
167 .borrow()
168 .platform
169 .on_become_active(Box::new(move || callback(&mut *ctx.borrow_mut())));
170 self
171 }
172
173 pub fn on_resign_active<F>(self, mut callback: F) -> Self
174 where
175 F: 'static + FnMut(&mut MutableAppContext),
176 {
177 let ctx = self.0.clone();
178 self.0
179 .borrow()
180 .platform
181 .on_resign_active(Box::new(move || callback(&mut *ctx.borrow_mut())));
182 self
183 }
184
185 pub fn on_event<F>(self, mut callback: F) -> Self
186 where
187 F: 'static + FnMut(Event, &mut MutableAppContext) -> bool,
188 {
189 let ctx = self.0.clone();
190 self.0.borrow().platform.on_event(Box::new(move |event| {
191 callback(event, &mut *ctx.borrow_mut())
192 }));
193 self
194 }
195
196 pub fn on_open_files<F>(self, mut callback: F) -> Self
197 where
198 F: 'static + FnMut(Vec<PathBuf>, &mut MutableAppContext),
199 {
200 let ctx = self.0.clone();
201 self.0
202 .borrow()
203 .platform
204 .on_open_files(Box::new(move |paths| {
205 callback(paths, &mut *ctx.borrow_mut())
206 }));
207 self
208 }
209
210 pub fn run<F>(self, on_finish_launching: F)
211 where
212 F: 'static + FnOnce(&mut MutableAppContext),
213 {
214 let platform = self.0.borrow().platform.clone();
215 platform.run(Box::new(move || {
216 let mut ctx = self.0.borrow_mut();
217 on_finish_launching(&mut *ctx);
218 }))
219 }
220
221 pub fn font_cache(&self) -> Arc<FontCache> {
222 self.0.borrow().ctx.font_cache.clone()
223 }
224
225 fn update<T, F: FnOnce(&mut MutableAppContext) -> T>(&mut self, callback: F) -> T {
226 let mut state = self.0.borrow_mut();
227 state.pending_flushes += 1;
228 let result = callback(&mut *state);
229 state.flush_effects();
230 result
231 }
232}
233
234impl TestAppContext {
235 pub fn dispatch_action<T: 'static + Any>(
236 &self,
237 window_id: usize,
238 responder_chain: Vec<usize>,
239 name: &str,
240 arg: T,
241 ) {
242 self.0.borrow_mut().dispatch_action_any(
243 window_id,
244 &responder_chain,
245 name,
246 Box::new(arg).as_ref(),
247 );
248 }
249
250 pub fn dispatch_keystroke(
251 &self,
252 window_id: usize,
253 responder_chain: Vec<usize>,
254 keystroke: &Keystroke,
255 ) -> Result<bool> {
256 let mut state = self.0.borrow_mut();
257 state.dispatch_keystroke(window_id, responder_chain, keystroke)
258 }
259
260 pub fn add_model<T, F>(&mut self, build_model: F) -> ModelHandle<T>
261 where
262 T: Entity,
263 F: FnOnce(&mut ModelContext<T>) -> T,
264 {
265 let mut state = self.0.borrow_mut();
266 state.pending_flushes += 1;
267 let handle = state.add_model(build_model);
268 state.flush_effects();
269 handle
270 }
271
272 pub fn add_window<T, F>(&mut self, build_root_view: F) -> (usize, ViewHandle<T>)
273 where
274 T: View,
275 F: FnOnce(&mut ViewContext<T>) -> T,
276 {
277 self.0.borrow_mut().add_window(build_root_view)
278 }
279
280 pub fn window_ids(&self) -> Vec<usize> {
281 self.0.borrow().window_ids().collect()
282 }
283
284 pub fn root_view<T: View>(&self, window_id: usize) -> Option<ViewHandle<T>> {
285 self.0.borrow().root_view(window_id)
286 }
287
288 pub fn add_view<T, F>(&mut self, window_id: usize, build_view: F) -> ViewHandle<T>
289 where
290 T: View,
291 F: FnOnce(&mut ViewContext<T>) -> T,
292 {
293 let mut state = self.0.borrow_mut();
294 state.pending_flushes += 1;
295 let handle = state.add_view(window_id, build_view);
296 state.flush_effects();
297 handle
298 }
299
300 pub fn add_option_view<T, F>(
301 &mut self,
302 window_id: usize,
303 build_view: F,
304 ) -> Option<ViewHandle<T>>
305 where
306 T: View,
307 F: FnOnce(&mut ViewContext<T>) -> Option<T>,
308 {
309 let mut state = self.0.borrow_mut();
310 state.pending_flushes += 1;
311 let handle = state.add_option_view(window_id, build_view);
312 state.flush_effects();
313 handle
314 }
315
316 pub fn read<T, F: FnOnce(&AppContext) -> T>(&self, callback: F) -> T {
317 callback(self.0.borrow().as_ref())
318 }
319
320 pub fn update<T, F: FnOnce(&mut MutableAppContext) -> T>(&mut self, callback: F) -> T {
321 let mut state = self.0.borrow_mut();
322 // Don't increment pending flushes in order to effects to be flushed before the callback
323 // completes, which is helpful in tests.
324 let result = callback(&mut *state);
325 // Flush effects after the callback just in case there are any. This can happen in edge
326 // cases such as the closure dropping handles.
327 state.flush_effects();
328 result
329 }
330
331 pub fn font_cache(&self) -> Arc<FontCache> {
332 self.0.borrow().ctx.font_cache.clone()
333 }
334
335 pub fn platform(&self) -> Rc<dyn platform::Platform> {
336 self.0.borrow().platform.clone()
337 }
338
339 pub fn simulate_new_path_selection(&self, result: impl FnOnce(PathBuf) -> Option<PathBuf>) {
340 self.1.as_ref().simulate_new_path_selection(result);
341 }
342
343 pub fn did_prompt_for_new_path(&self) -> bool {
344 self.1.as_ref().did_prompt_for_new_path()
345 }
346}
347
348impl UpdateModel for TestAppContext {
349 fn update_model<T, F, S>(&mut self, handle: &ModelHandle<T>, update: F) -> S
350 where
351 T: Entity,
352 F: FnOnce(&mut T, &mut ModelContext<T>) -> S,
353 {
354 let mut state = self.0.borrow_mut();
355 state.pending_flushes += 1;
356 let result = state.update_model(handle, update);
357 state.flush_effects();
358 result
359 }
360}
361
362impl UpdateView for TestAppContext {
363 fn update_view<T, F, S>(&mut self, handle: &ViewHandle<T>, update: F) -> S
364 where
365 T: View,
366 F: FnOnce(&mut T, &mut ViewContext<T>) -> S,
367 {
368 let mut state = self.0.borrow_mut();
369 state.pending_flushes += 1;
370 let result = state.update_view(handle, update);
371 state.flush_effects();
372 result
373 }
374}
375
376type ActionCallback =
377 dyn FnMut(&mut dyn AnyView, &dyn Any, &mut MutableAppContext, usize, usize) -> bool;
378
379type GlobalActionCallback = dyn FnMut(&dyn Any, &mut MutableAppContext);
380
381pub struct MutableAppContext {
382 weak_self: Option<rc::Weak<RefCell<Self>>>,
383 platform: Rc<dyn platform::Platform>,
384 assets: Arc<AssetCache>,
385 ctx: AppContext,
386 actions: HashMap<TypeId, HashMap<String, Vec<Box<ActionCallback>>>>,
387 global_actions: HashMap<String, Vec<Box<GlobalActionCallback>>>,
388 keystroke_matcher: keymap::Matcher,
389 next_entity_id: usize,
390 next_window_id: usize,
391 next_task_id: usize,
392 subscriptions: HashMap<usize, Vec<Subscription>>,
393 model_observations: HashMap<usize, Vec<ModelObservation>>,
394 view_observations: HashMap<usize, Vec<ViewObservation>>,
395 presenters_and_platform_windows:
396 HashMap<usize, (Rc<RefCell<Presenter>>, Box<dyn platform::Window>)>,
397 debug_elements_callbacks: HashMap<usize, Box<dyn Fn(&AppContext) -> crate::json::Value>>,
398 foreground: Rc<executor::Foreground>,
399 future_handlers: Rc<RefCell<HashMap<usize, FutureHandler>>>,
400 stream_handlers: Rc<RefCell<HashMap<usize, StreamHandler>>>,
401 pending_effects: VecDeque<Effect>,
402 pending_flushes: usize,
403 flushing_effects: bool,
404}
405
406impl MutableAppContext {
407 pub fn new(
408 foreground: Rc<executor::Foreground>,
409 platform: Rc<dyn platform::Platform>,
410 asset_source: impl AssetSource,
411 ) -> Self {
412 let fonts = platform.fonts();
413 Self {
414 weak_self: None,
415 platform,
416 assets: Arc::new(AssetCache::new(asset_source)),
417 ctx: AppContext {
418 models: Default::default(),
419 views: Default::default(),
420 windows: Default::default(),
421 values: Default::default(),
422 ref_counts: Arc::new(Mutex::new(RefCounts::default())),
423 background: Arc::new(executor::Background::new()),
424 thread_pool: scoped_pool::Pool::new(num_cpus::get(), "app"),
425 font_cache: Arc::new(FontCache::new(fonts)),
426 },
427 actions: HashMap::new(),
428 global_actions: HashMap::new(),
429 keystroke_matcher: keymap::Matcher::default(),
430 next_entity_id: 0,
431 next_window_id: 0,
432 next_task_id: 0,
433 subscriptions: HashMap::new(),
434 model_observations: HashMap::new(),
435 view_observations: HashMap::new(),
436 presenters_and_platform_windows: HashMap::new(),
437 debug_elements_callbacks: HashMap::new(),
438 foreground,
439 future_handlers: Default::default(),
440 stream_handlers: Default::default(),
441 pending_effects: VecDeque::new(),
442 pending_flushes: 0,
443 flushing_effects: false,
444 }
445 }
446
447 pub fn upgrade(&self) -> App {
448 App(self.weak_self.as_ref().unwrap().upgrade().unwrap())
449 }
450
451 pub fn platform(&self) -> Rc<dyn platform::Platform> {
452 self.platform.clone()
453 }
454
455 pub fn font_cache(&self) -> &Arc<FontCache> {
456 &self.ctx.font_cache
457 }
458
459 pub fn foreground_executor(&self) -> &Rc<executor::Foreground> {
460 &self.foreground
461 }
462
463 pub fn background_executor(&self) -> &Arc<executor::Background> {
464 &self.ctx.background
465 }
466
467 pub fn on_debug_elements<F>(&mut self, window_id: usize, callback: F)
468 where
469 F: 'static + Fn(&AppContext) -> crate::json::Value,
470 {
471 self.debug_elements_callbacks
472 .insert(window_id, Box::new(callback));
473 }
474
475 pub fn debug_elements(&self, window_id: usize) -> Option<crate::json::Value> {
476 self.debug_elements_callbacks
477 .get(&window_id)
478 .map(|debug_elements| debug_elements(&self.ctx))
479 }
480
481 pub fn add_action<S, V, T, F>(&mut self, name: S, mut handler: F)
482 where
483 S: Into<String>,
484 V: View,
485 T: Any,
486 F: 'static + FnMut(&mut V, &T, &mut ViewContext<V>),
487 {
488 let name = name.into();
489 let name_clone = name.clone();
490 let handler = Box::new(
491 move |view: &mut dyn AnyView,
492 arg: &dyn Any,
493 app: &mut MutableAppContext,
494 window_id: usize,
495 view_id: usize| {
496 match arg.downcast_ref() {
497 Some(arg) => {
498 let mut ctx = ViewContext::new(app, window_id, view_id);
499 handler(
500 view.as_any_mut()
501 .downcast_mut()
502 .expect("downcast is type safe"),
503 arg,
504 &mut ctx,
505 );
506 ctx.halt_action_dispatch
507 }
508 None => {
509 log::error!("Could not downcast argument for action {}", name_clone);
510 false
511 }
512 }
513 },
514 );
515
516 self.actions
517 .entry(TypeId::of::<V>())
518 .or_default()
519 .entry(name)
520 .or_default()
521 .push(handler);
522 }
523
524 pub fn add_global_action<S, T, F>(&mut self, name: S, mut handler: F)
525 where
526 S: Into<String>,
527 T: 'static + Any,
528 F: 'static + FnMut(&T, &mut MutableAppContext),
529 {
530 let name = name.into();
531 let name_clone = name.clone();
532 let handler = Box::new(move |arg: &dyn Any, app: &mut MutableAppContext| {
533 if let Some(arg) = arg.downcast_ref() {
534 handler(arg, app);
535 } else {
536 log::error!("Could not downcast argument for action {}", name_clone);
537 }
538 });
539
540 self.global_actions.entry(name).or_default().push(handler);
541 }
542
543 pub fn window_ids(&self) -> impl Iterator<Item = usize> + '_ {
544 self.ctx.windows.keys().cloned()
545 }
546
547 pub fn root_view<T: View>(&self, window_id: usize) -> Option<ViewHandle<T>> {
548 self.ctx
549 .windows
550 .get(&window_id)
551 .and_then(|window| window.root_view.clone().downcast::<T>())
552 }
553
554 pub fn root_view_id(&self, window_id: usize) -> Option<usize> {
555 self.ctx.root_view_id(window_id)
556 }
557
558 pub fn focused_view_id(&self, window_id: usize) -> Option<usize> {
559 self.ctx.focused_view_id(window_id)
560 }
561
562 pub fn render_view(&self, window_id: usize, view_id: usize) -> Result<ElementBox> {
563 self.ctx.render_view(window_id, view_id)
564 }
565
566 pub fn render_views(&self, window_id: usize) -> HashMap<usize, ElementBox> {
567 self.ctx.render_views(window_id)
568 }
569
570 pub fn update<T, F: FnOnce() -> T>(&mut self, callback: F) -> T {
571 self.pending_flushes += 1;
572 let result = callback();
573 self.flush_effects();
574 result
575 }
576
577 pub fn set_menus(&self, menus: Vec<Menu>) {
578 self.platform.set_menus(menus);
579 }
580
581 pub fn prompt_for_paths<F>(&self, options: PathPromptOptions, done_fn: F)
582 where
583 F: 'static + FnOnce(Option<Vec<PathBuf>>, &mut MutableAppContext),
584 {
585 let app = self.weak_self.as_ref().unwrap().upgrade().unwrap();
586 let foreground = self.foreground.clone();
587 self.platform().prompt_for_paths(
588 options,
589 Box::new(move |paths| {
590 foreground
591 .spawn(async move { (done_fn)(paths, &mut *app.borrow_mut()) })
592 .detach();
593 }),
594 );
595 }
596
597 pub fn prompt_for_new_path<F>(&self, directory: &Path, done_fn: F)
598 where
599 F: 'static + FnOnce(Option<PathBuf>, &mut MutableAppContext),
600 {
601 let app = self.weak_self.as_ref().unwrap().upgrade().unwrap();
602 let foreground = self.foreground.clone();
603 self.platform().prompt_for_new_path(
604 directory,
605 Box::new(move |path| {
606 foreground
607 .spawn(async move { (done_fn)(path, &mut *app.borrow_mut()) })
608 .detach();
609 }),
610 );
611 }
612
613 pub(crate) fn notify_view(&mut self, window_id: usize, view_id: usize) {
614 self.pending_effects
615 .push_back(Effect::ViewNotification { window_id, view_id });
616 }
617
618 pub fn dispatch_action<T: 'static + Any>(
619 &mut self,
620 window_id: usize,
621 responder_chain: Vec<usize>,
622 name: &str,
623 arg: T,
624 ) {
625 self.dispatch_action_any(window_id, &responder_chain, name, Box::new(arg).as_ref());
626 }
627
628 pub(crate) fn dispatch_action_any(
629 &mut self,
630 window_id: usize,
631 path: &[usize],
632 name: &str,
633 arg: &dyn Any,
634 ) -> bool {
635 self.pending_flushes += 1;
636 let mut halted_dispatch = false;
637
638 for view_id in path.iter().rev() {
639 if let Some(mut view) = self.ctx.views.remove(&(window_id, *view_id)) {
640 let type_id = view.as_any().type_id();
641
642 if let Some((name, mut handlers)) = self
643 .actions
644 .get_mut(&type_id)
645 .and_then(|h| h.remove_entry(name))
646 {
647 for handler in handlers.iter_mut().rev() {
648 let halt_dispatch = handler(view.as_mut(), arg, self, window_id, *view_id);
649 if halt_dispatch {
650 halted_dispatch = true;
651 break;
652 }
653 }
654 self.actions
655 .get_mut(&type_id)
656 .unwrap()
657 .insert(name, handlers);
658 }
659
660 self.ctx.views.insert((window_id, *view_id), view);
661
662 if halted_dispatch {
663 break;
664 }
665 }
666 }
667
668 if !halted_dispatch {
669 self.dispatch_global_action_any(name, arg);
670 }
671
672 self.flush_effects();
673 halted_dispatch
674 }
675
676 pub fn dispatch_global_action<T: 'static + Any>(&mut self, name: &str, arg: T) {
677 self.dispatch_global_action_any(name, Box::new(arg).as_ref());
678 }
679
680 fn dispatch_global_action_any(&mut self, name: &str, arg: &dyn Any) {
681 if let Some((name, mut handlers)) = self.global_actions.remove_entry(name) {
682 self.pending_flushes += 1;
683 for handler in handlers.iter_mut().rev() {
684 handler(arg, self);
685 }
686 self.global_actions.insert(name, handlers);
687 self.flush_effects();
688 }
689 }
690
691 pub fn add_bindings<T: IntoIterator<Item = keymap::Binding>>(&mut self, bindings: T) {
692 self.keystroke_matcher.add_bindings(bindings);
693 }
694
695 pub fn dispatch_keystroke(
696 &mut self,
697 window_id: usize,
698 responder_chain: Vec<usize>,
699 keystroke: &Keystroke,
700 ) -> Result<bool> {
701 let mut context_chain = Vec::new();
702 let mut context = keymap::Context::default();
703 for view_id in &responder_chain {
704 if let Some(view) = self.ctx.views.get(&(window_id, *view_id)) {
705 context.extend(view.keymap_context(self.as_ref()));
706 context_chain.push(context.clone());
707 } else {
708 return Err(anyhow!(
709 "View {} in responder chain does not exist",
710 view_id
711 ));
712 }
713 }
714
715 let mut pending = false;
716 for (i, ctx) in context_chain.iter().enumerate().rev() {
717 match self
718 .keystroke_matcher
719 .push_keystroke(keystroke.clone(), responder_chain[i], ctx)
720 {
721 MatchResult::None => {}
722 MatchResult::Pending => pending = true,
723 MatchResult::Action { name, arg } => {
724 if self.dispatch_action_any(
725 window_id,
726 &responder_chain[0..=i],
727 &name,
728 arg.as_ref().map(|arg| arg.as_ref()).unwrap_or(&()),
729 ) {
730 return Ok(true);
731 }
732 }
733 }
734 }
735
736 Ok(pending)
737 }
738
739 pub fn add_model<T, F>(&mut self, build_model: F) -> ModelHandle<T>
740 where
741 T: Entity,
742 F: FnOnce(&mut ModelContext<T>) -> T,
743 {
744 self.pending_flushes += 1;
745 let model_id = post_inc(&mut self.next_entity_id);
746 let handle = ModelHandle::new(model_id, &self.ctx.ref_counts);
747 let mut ctx = ModelContext::new(self, model_id);
748 let model = build_model(&mut ctx);
749 self.ctx.models.insert(model_id, Box::new(model));
750 self.flush_effects();
751 handle
752 }
753
754 pub fn add_window<T, F>(&mut self, build_root_view: F) -> (usize, ViewHandle<T>)
755 where
756 T: View,
757 F: FnOnce(&mut ViewContext<T>) -> T,
758 {
759 self.pending_flushes += 1;
760 let window_id = post_inc(&mut self.next_window_id);
761 let root_view = self.add_view(window_id, build_root_view);
762
763 self.ctx.windows.insert(
764 window_id,
765 Window {
766 root_view: root_view.clone().into(),
767 focused_view_id: root_view.id(),
768 invalidation: None,
769 },
770 );
771 self.open_platform_window(window_id);
772 root_view.update(self, |view, ctx| view.on_focus(ctx));
773 self.flush_effects();
774
775 (window_id, root_view)
776 }
777
778 pub fn remove_window(&mut self, window_id: usize) {
779 self.ctx.windows.remove(&window_id);
780 self.presenters_and_platform_windows.remove(&window_id);
781 self.remove_dropped_entities();
782 }
783
784 fn open_platform_window(&mut self, window_id: usize) {
785 let mut window = self.platform.open_window(
786 window_id,
787 WindowOptions {
788 bounds: RectF::new(vec2f(0., 0.), vec2f(1024., 768.)),
789 title: "Zed".into(),
790 },
791 self.foreground.clone(),
792 );
793 let text_layout_cache = TextLayoutCache::new(self.platform.fonts());
794 let presenter = Rc::new(RefCell::new(Presenter::new(
795 window_id,
796 self.ctx.font_cache.clone(),
797 text_layout_cache,
798 self.assets.clone(),
799 self,
800 )));
801
802 {
803 let mut app = self.upgrade();
804 let presenter = presenter.clone();
805 window.on_event(Box::new(move |event| {
806 app.update(|ctx| {
807 if let Event::KeyDown { keystroke, .. } = &event {
808 if ctx
809 .dispatch_keystroke(
810 window_id,
811 presenter.borrow().dispatch_path(ctx.as_ref()),
812 keystroke,
813 )
814 .unwrap()
815 {
816 return;
817 }
818 }
819
820 presenter.borrow_mut().dispatch_event(event, ctx);
821 })
822 }));
823 }
824
825 {
826 let mut app = self.upgrade();
827 let presenter = presenter.clone();
828 window.on_resize(Box::new(move |window| {
829 app.update(|ctx| {
830 let scene = presenter.borrow_mut().build_scene(
831 window.size(),
832 window.scale_factor(),
833 ctx,
834 );
835 window.present_scene(scene);
836 })
837 }));
838 }
839
840 {
841 let mut app = self.upgrade();
842 window.on_close(Box::new(move || {
843 app.update(|ctx| ctx.remove_window(window_id));
844 }));
845 }
846
847 self.presenters_and_platform_windows
848 .insert(window_id, (presenter.clone(), window));
849
850 self.on_debug_elements(window_id, move |ctx| {
851 presenter.borrow().debug_elements(ctx).unwrap()
852 });
853 }
854
855 pub fn add_view<T, F>(&mut self, window_id: usize, build_view: F) -> ViewHandle<T>
856 where
857 T: View,
858 F: FnOnce(&mut ViewContext<T>) -> T,
859 {
860 self.add_option_view(window_id, |ctx| Some(build_view(ctx)))
861 .unwrap()
862 }
863
864 pub fn add_option_view<T, F>(
865 &mut self,
866 window_id: usize,
867 build_view: F,
868 ) -> Option<ViewHandle<T>>
869 where
870 T: View,
871 F: FnOnce(&mut ViewContext<T>) -> Option<T>,
872 {
873 let view_id = post_inc(&mut self.next_entity_id);
874 self.pending_flushes += 1;
875 let handle = ViewHandle::new(window_id, view_id, &self.ctx.ref_counts);
876 let mut ctx = ViewContext::new(self, window_id, view_id);
877 let handle = if let Some(view) = build_view(&mut ctx) {
878 self.ctx.views.insert((window_id, view_id), Box::new(view));
879 if let Some(window) = self.ctx.windows.get_mut(&window_id) {
880 window
881 .invalidation
882 .get_or_insert_with(Default::default)
883 .updated
884 .insert(view_id);
885 }
886 Some(handle)
887 } else {
888 None
889 };
890 self.flush_effects();
891 handle
892 }
893
894 fn remove_dropped_entities(&mut self) {
895 loop {
896 let (dropped_models, dropped_views, dropped_values) =
897 self.ctx.ref_counts.lock().take_dropped();
898 if dropped_models.is_empty() && dropped_views.is_empty() && dropped_values.is_empty() {
899 break;
900 }
901
902 for model_id in dropped_models {
903 self.ctx.models.remove(&model_id);
904 self.subscriptions.remove(&model_id);
905 self.model_observations.remove(&model_id);
906 }
907
908 for (window_id, view_id) in dropped_views {
909 self.subscriptions.remove(&view_id);
910 self.model_observations.remove(&view_id);
911 self.ctx.views.remove(&(window_id, view_id));
912 let change_focus_to = self.ctx.windows.get_mut(&window_id).and_then(|window| {
913 window
914 .invalidation
915 .get_or_insert_with(Default::default)
916 .removed
917 .push(view_id);
918 if window.focused_view_id == view_id {
919 Some(window.root_view.id())
920 } else {
921 None
922 }
923 });
924
925 if let Some(view_id) = change_focus_to {
926 self.focus(window_id, view_id);
927 }
928 }
929
930 let mut values = self.ctx.values.write();
931 for key in dropped_values {
932 values.remove(&key);
933 }
934 }
935 }
936
937 fn flush_effects(&mut self) {
938 self.pending_flushes = self.pending_flushes.saturating_sub(1);
939
940 if !self.flushing_effects && self.pending_flushes == 0 {
941 self.flushing_effects = true;
942
943 loop {
944 if let Some(effect) = self.pending_effects.pop_front() {
945 match effect {
946 Effect::Event { entity_id, payload } => self.emit_event(entity_id, payload),
947 Effect::ModelNotification { model_id } => {
948 self.notify_model_observers(model_id)
949 }
950 Effect::ViewNotification { window_id, view_id } => {
951 self.notify_view_observers(window_id, view_id)
952 }
953 Effect::Focus { window_id, view_id } => {
954 self.focus(window_id, view_id);
955 }
956 }
957 } else {
958 self.remove_dropped_entities();
959 self.update_windows();
960
961 if self.pending_effects.is_empty() {
962 self.flushing_effects = false;
963 break;
964 }
965 }
966 }
967 }
968 }
969
970 fn update_windows(&mut self) {
971 let mut invalidations = HashMap::new();
972 for (window_id, window) in &mut self.ctx.windows {
973 if let Some(invalidation) = window.invalidation.take() {
974 invalidations.insert(*window_id, invalidation);
975 }
976 }
977
978 for (window_id, invalidation) in invalidations {
979 if let Some((presenter, mut window)) =
980 self.presenters_and_platform_windows.remove(&window_id)
981 {
982 {
983 let mut presenter = presenter.borrow_mut();
984 presenter.invalidate(invalidation, self.as_ref());
985 let scene = presenter.build_scene(window.size(), window.scale_factor(), self);
986 window.present_scene(scene);
987 }
988 self.presenters_and_platform_windows
989 .insert(window_id, (presenter, window));
990 }
991 }
992 }
993
994 fn emit_event(&mut self, entity_id: usize, payload: Box<dyn Any>) {
995 if let Some(subscriptions) = self.subscriptions.remove(&entity_id) {
996 for mut subscription in subscriptions {
997 let alive = match &mut subscription {
998 Subscription::FromModel { model_id, callback } => {
999 if let Some(mut model) = self.ctx.models.remove(model_id) {
1000 callback(model.as_any_mut(), payload.as_ref(), self, *model_id);
1001 self.ctx.models.insert(*model_id, model);
1002 true
1003 } else {
1004 false
1005 }
1006 }
1007 Subscription::FromView {
1008 window_id,
1009 view_id,
1010 callback,
1011 } => {
1012 if let Some(mut view) = self.ctx.views.remove(&(*window_id, *view_id)) {
1013 callback(
1014 view.as_any_mut(),
1015 payload.as_ref(),
1016 self,
1017 *window_id,
1018 *view_id,
1019 );
1020 self.ctx.views.insert((*window_id, *view_id), view);
1021 true
1022 } else {
1023 false
1024 }
1025 }
1026 };
1027
1028 if alive {
1029 self.subscriptions
1030 .entry(entity_id)
1031 .or_default()
1032 .push(subscription);
1033 }
1034 }
1035 }
1036 }
1037
1038 fn notify_model_observers(&mut self, observed_id: usize) {
1039 if let Some(observations) = self.model_observations.remove(&observed_id) {
1040 if self.ctx.models.contains_key(&observed_id) {
1041 for mut observation in observations {
1042 let alive = match &mut observation {
1043 ModelObservation::FromModel { model_id, callback } => {
1044 if let Some(mut model) = self.ctx.models.remove(model_id) {
1045 callback(model.as_any_mut(), observed_id, self, *model_id);
1046 self.ctx.models.insert(*model_id, model);
1047 true
1048 } else {
1049 false
1050 }
1051 }
1052 ModelObservation::FromView {
1053 window_id,
1054 view_id,
1055 callback,
1056 } => {
1057 if let Some(mut view) = self.ctx.views.remove(&(*window_id, *view_id)) {
1058 callback(
1059 view.as_any_mut(),
1060 observed_id,
1061 self,
1062 *window_id,
1063 *view_id,
1064 );
1065 self.ctx.views.insert((*window_id, *view_id), view);
1066 true
1067 } else {
1068 false
1069 }
1070 }
1071 };
1072
1073 if alive {
1074 self.model_observations
1075 .entry(observed_id)
1076 .or_default()
1077 .push(observation);
1078 }
1079 }
1080 }
1081 }
1082 }
1083
1084 fn notify_view_observers(&mut self, window_id: usize, view_id: usize) {
1085 if let Some(window) = self.ctx.windows.get_mut(&window_id) {
1086 window
1087 .invalidation
1088 .get_or_insert_with(Default::default)
1089 .updated
1090 .insert(view_id);
1091 }
1092
1093 if let Some(observations) = self.view_observations.remove(&view_id) {
1094 if self.ctx.views.contains_key(&(window_id, view_id)) {
1095 for mut observation in observations {
1096 let alive = if let Some(mut view) = self
1097 .ctx
1098 .views
1099 .remove(&(observation.window_id, observation.view_id))
1100 {
1101 (observation.callback)(
1102 view.as_any_mut(),
1103 view_id,
1104 window_id,
1105 self,
1106 observation.window_id,
1107 observation.view_id,
1108 );
1109 self.ctx
1110 .views
1111 .insert((observation.window_id, observation.view_id), view);
1112 true
1113 } else {
1114 false
1115 };
1116
1117 if alive {
1118 self.view_observations
1119 .entry(view_id)
1120 .or_default()
1121 .push(observation);
1122 }
1123 }
1124 }
1125 }
1126 }
1127
1128 fn focus(&mut self, window_id: usize, focused_id: usize) {
1129 if self
1130 .ctx
1131 .windows
1132 .get(&window_id)
1133 .map(|w| w.focused_view_id)
1134 .map_or(false, |cur_focused| cur_focused == focused_id)
1135 {
1136 return;
1137 }
1138
1139 self.pending_flushes += 1;
1140
1141 let blurred_id = self.ctx.windows.get_mut(&window_id).map(|window| {
1142 let blurred_id = window.focused_view_id;
1143 window.focused_view_id = focused_id;
1144 blurred_id
1145 });
1146
1147 if let Some(blurred_id) = blurred_id {
1148 if let Some(mut blurred_view) = self.ctx.views.remove(&(window_id, blurred_id)) {
1149 blurred_view.on_blur(self, window_id, blurred_id);
1150 self.ctx.views.insert((window_id, blurred_id), blurred_view);
1151 }
1152 }
1153
1154 if let Some(mut focused_view) = self.ctx.views.remove(&(window_id, focused_id)) {
1155 focused_view.on_focus(self, window_id, focused_id);
1156 self.ctx.views.insert((window_id, focused_id), focused_view);
1157 }
1158
1159 self.flush_effects();
1160 }
1161
1162 fn spawn<F, T>(&mut self, spawner: Spawner, future: F) -> EntityTask<T>
1163 where
1164 F: 'static + Future,
1165 T: 'static,
1166 {
1167 let task_id = post_inc(&mut self.next_task_id);
1168 let app = self.weak_self.as_ref().unwrap().upgrade().unwrap();
1169 let task = {
1170 let app = app.clone();
1171 self.foreground.spawn(async move {
1172 let output = future.await;
1173 app.borrow_mut()
1174 .handle_future_output(task_id, Box::new(output))
1175 .map(|output| *output.downcast::<T>().unwrap())
1176 })
1177 };
1178 EntityTask::new(
1179 task_id,
1180 task,
1181 spawner,
1182 TaskHandlerMap::Future(self.future_handlers.clone()),
1183 )
1184 }
1185
1186 fn spawn_stream<F, T>(&mut self, spawner: Spawner, mut stream: F) -> EntityTask<T>
1187 where
1188 F: 'static + Stream + Unpin,
1189 T: 'static,
1190 {
1191 let task_id = post_inc(&mut self.next_task_id);
1192 let app = self.weak_self.as_ref().unwrap().upgrade().unwrap();
1193 let task = self.foreground.spawn(async move {
1194 loop {
1195 match stream.next().await {
1196 Some(item) => {
1197 let mut app = app.borrow_mut();
1198 if app.handle_stream_item(task_id, Box::new(item)) {
1199 break;
1200 }
1201 }
1202 None => {
1203 break;
1204 }
1205 }
1206 }
1207
1208 app.borrow_mut()
1209 .stream_completed(task_id)
1210 .map(|output| *output.downcast::<T>().unwrap())
1211 });
1212
1213 EntityTask::new(
1214 task_id,
1215 task,
1216 spawner,
1217 TaskHandlerMap::Stream(self.stream_handlers.clone()),
1218 )
1219 }
1220
1221 fn handle_future_output(
1222 &mut self,
1223 task_id: usize,
1224 output: Box<dyn Any>,
1225 ) -> Option<Box<dyn Any>> {
1226 self.pending_flushes += 1;
1227 let future_callback = self.future_handlers.borrow_mut().remove(&task_id).unwrap();
1228 let result = future_callback(output, self);
1229 self.flush_effects();
1230 result
1231 }
1232
1233 fn handle_stream_item(&mut self, task_id: usize, output: Box<dyn Any>) -> bool {
1234 self.pending_flushes += 1;
1235
1236 let mut handler = self.stream_handlers.borrow_mut().remove(&task_id).unwrap();
1237 let halt = (handler.item_callback)(output, self);
1238 self.stream_handlers.borrow_mut().insert(task_id, handler);
1239
1240 self.flush_effects();
1241 halt
1242 }
1243
1244 fn stream_completed(&mut self, task_id: usize) -> Option<Box<dyn Any>> {
1245 self.pending_flushes += 1;
1246
1247 let handler = self.stream_handlers.borrow_mut().remove(&task_id).unwrap();
1248 let result = (handler.done_callback)(self);
1249
1250 self.flush_effects();
1251 result
1252 }
1253
1254 pub fn write_to_clipboard(&self, item: ClipboardItem) {
1255 self.platform.write_to_clipboard(item);
1256 }
1257
1258 pub fn read_from_clipboard(&self) -> Option<ClipboardItem> {
1259 self.platform.read_from_clipboard()
1260 }
1261}
1262
1263impl ReadModel for MutableAppContext {
1264 fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T {
1265 if let Some(model) = self.ctx.models.get(&handle.model_id) {
1266 model
1267 .as_any()
1268 .downcast_ref()
1269 .expect("downcast is type safe")
1270 } else {
1271 panic!("circular model reference");
1272 }
1273 }
1274}
1275
1276impl UpdateModel for MutableAppContext {
1277 fn update_model<T, F, S>(&mut self, handle: &ModelHandle<T>, update: F) -> S
1278 where
1279 T: Entity,
1280 F: FnOnce(&mut T, &mut ModelContext<T>) -> S,
1281 {
1282 if let Some(mut model) = self.ctx.models.remove(&handle.model_id) {
1283 self.pending_flushes += 1;
1284 let mut ctx = ModelContext::new(self, handle.model_id);
1285 let result = update(
1286 model
1287 .as_any_mut()
1288 .downcast_mut()
1289 .expect("downcast is type safe"),
1290 &mut ctx,
1291 );
1292 self.ctx.models.insert(handle.model_id, model);
1293 self.flush_effects();
1294 result
1295 } else {
1296 panic!("circular model update");
1297 }
1298 }
1299}
1300
1301impl ReadView for MutableAppContext {
1302 fn read_view<T: View>(&self, handle: &ViewHandle<T>) -> &T {
1303 if let Some(view) = self.ctx.views.get(&(handle.window_id, handle.view_id)) {
1304 view.as_any().downcast_ref().expect("downcast is type safe")
1305 } else {
1306 panic!("circular view reference");
1307 }
1308 }
1309}
1310
1311impl UpdateView for MutableAppContext {
1312 fn update_view<T, F, S>(&mut self, handle: &ViewHandle<T>, update: F) -> S
1313 where
1314 T: View,
1315 F: FnOnce(&mut T, &mut ViewContext<T>) -> S,
1316 {
1317 self.pending_flushes += 1;
1318 let mut view = self
1319 .ctx
1320 .views
1321 .remove(&(handle.window_id, handle.view_id))
1322 .expect("circular view update");
1323
1324 let mut ctx = ViewContext::new(self, handle.window_id, handle.view_id);
1325 let result = update(
1326 view.as_any_mut()
1327 .downcast_mut()
1328 .expect("downcast is type safe"),
1329 &mut ctx,
1330 );
1331 self.ctx
1332 .views
1333 .insert((handle.window_id, handle.view_id), view);
1334 self.flush_effects();
1335 result
1336 }
1337}
1338
1339impl AsRef<AppContext> for MutableAppContext {
1340 fn as_ref(&self) -> &AppContext {
1341 &self.ctx
1342 }
1343}
1344
1345pub struct AppContext {
1346 models: HashMap<usize, Box<dyn AnyModel>>,
1347 views: HashMap<(usize, usize), Box<dyn AnyView>>,
1348 windows: HashMap<usize, Window>,
1349 values: RwLock<HashMap<(TypeId, usize), Box<dyn Any>>>,
1350 background: Arc<executor::Background>,
1351 ref_counts: Arc<Mutex<RefCounts>>,
1352 thread_pool: scoped_pool::Pool,
1353 font_cache: Arc<FontCache>,
1354}
1355
1356impl AppContext {
1357 pub fn root_view_id(&self, window_id: usize) -> Option<usize> {
1358 self.windows
1359 .get(&window_id)
1360 .map(|window| window.root_view.id())
1361 }
1362
1363 pub fn focused_view_id(&self, window_id: usize) -> Option<usize> {
1364 self.windows
1365 .get(&window_id)
1366 .map(|window| window.focused_view_id)
1367 }
1368
1369 pub fn render_view(&self, window_id: usize, view_id: usize) -> Result<ElementBox> {
1370 self.views
1371 .get(&(window_id, view_id))
1372 .map(|v| v.render(self))
1373 .ok_or(anyhow!("view not found"))
1374 }
1375
1376 pub fn render_views(&self, window_id: usize) -> HashMap<usize, ElementBox> {
1377 self.views
1378 .iter()
1379 .filter_map(|((win_id, view_id), view)| {
1380 if *win_id == window_id {
1381 Some((*view_id, view.render(self)))
1382 } else {
1383 None
1384 }
1385 })
1386 .collect::<HashMap<_, ElementBox>>()
1387 }
1388
1389 pub fn background_executor(&self) -> &Arc<executor::Background> {
1390 &self.background
1391 }
1392
1393 pub fn font_cache(&self) -> &FontCache {
1394 &self.font_cache
1395 }
1396
1397 pub fn thread_pool(&self) -> &scoped_pool::Pool {
1398 &self.thread_pool
1399 }
1400
1401 pub fn value<Tag: 'static, T: 'static + Default>(&self, id: usize) -> ValueHandle<T> {
1402 let key = (TypeId::of::<Tag>(), id);
1403 let mut values = self.values.write();
1404 values.entry(key).or_insert_with(|| Box::new(T::default()));
1405 ValueHandle::new(TypeId::of::<Tag>(), id, &self.ref_counts)
1406 }
1407}
1408
1409impl ReadModel for AppContext {
1410 fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T {
1411 if let Some(model) = self.models.get(&handle.model_id) {
1412 model
1413 .as_any()
1414 .downcast_ref()
1415 .expect("downcast should be type safe")
1416 } else {
1417 panic!("circular model reference");
1418 }
1419 }
1420}
1421
1422impl ReadView for AppContext {
1423 fn read_view<T: View>(&self, handle: &ViewHandle<T>) -> &T {
1424 if let Some(view) = self.views.get(&(handle.window_id, handle.view_id)) {
1425 view.as_any()
1426 .downcast_ref()
1427 .expect("downcast should be type safe")
1428 } else {
1429 panic!("circular view reference");
1430 }
1431 }
1432}
1433
1434struct Window {
1435 root_view: AnyViewHandle,
1436 focused_view_id: usize,
1437 invalidation: Option<WindowInvalidation>,
1438}
1439
1440#[derive(Default, Clone)]
1441pub struct WindowInvalidation {
1442 pub updated: HashSet<usize>,
1443 pub removed: Vec<usize>,
1444}
1445
1446pub enum Effect {
1447 Event {
1448 entity_id: usize,
1449 payload: Box<dyn Any>,
1450 },
1451 ModelNotification {
1452 model_id: usize,
1453 },
1454 ViewNotification {
1455 window_id: usize,
1456 view_id: usize,
1457 },
1458 Focus {
1459 window_id: usize,
1460 view_id: usize,
1461 },
1462}
1463
1464pub trait AnyModel: Send + Sync {
1465 fn as_any(&self) -> &dyn Any;
1466 fn as_any_mut(&mut self) -> &mut dyn Any;
1467}
1468
1469impl<T> AnyModel for T
1470where
1471 T: Entity,
1472{
1473 fn as_any(&self) -> &dyn Any {
1474 self
1475 }
1476
1477 fn as_any_mut(&mut self) -> &mut dyn Any {
1478 self
1479 }
1480}
1481
1482pub trait AnyView: Send + Sync {
1483 fn as_any(&self) -> &dyn Any;
1484 fn as_any_mut(&mut self) -> &mut dyn Any;
1485 fn ui_name(&self) -> &'static str;
1486 fn render<'a>(&self, app: &AppContext) -> ElementBox;
1487 fn on_focus(&mut self, app: &mut MutableAppContext, window_id: usize, view_id: usize);
1488 fn on_blur(&mut self, app: &mut MutableAppContext, window_id: usize, view_id: usize);
1489 fn keymap_context(&self, app: &AppContext) -> keymap::Context;
1490}
1491
1492impl<T> AnyView for T
1493where
1494 T: View,
1495{
1496 fn as_any(&self) -> &dyn Any {
1497 self
1498 }
1499
1500 fn as_any_mut(&mut self) -> &mut dyn Any {
1501 self
1502 }
1503
1504 fn ui_name(&self) -> &'static str {
1505 T::ui_name()
1506 }
1507
1508 fn render<'a>(&self, app: &AppContext) -> ElementBox {
1509 View::render(self, app)
1510 }
1511
1512 fn on_focus(&mut self, app: &mut MutableAppContext, window_id: usize, view_id: usize) {
1513 let mut ctx = ViewContext::new(app, window_id, view_id);
1514 View::on_focus(self, &mut ctx);
1515 }
1516
1517 fn on_blur(&mut self, app: &mut MutableAppContext, window_id: usize, view_id: usize) {
1518 let mut ctx = ViewContext::new(app, window_id, view_id);
1519 View::on_blur(self, &mut ctx);
1520 }
1521
1522 fn keymap_context(&self, app: &AppContext) -> keymap::Context {
1523 View::keymap_context(self, app)
1524 }
1525}
1526
1527pub struct ModelContext<'a, T: ?Sized> {
1528 app: &'a mut MutableAppContext,
1529 model_id: usize,
1530 model_type: PhantomData<T>,
1531 halt_stream: bool,
1532}
1533
1534impl<'a, T: Entity> ModelContext<'a, T> {
1535 fn new(app: &'a mut MutableAppContext, model_id: usize) -> Self {
1536 Self {
1537 app,
1538 model_id,
1539 model_type: PhantomData,
1540 halt_stream: false,
1541 }
1542 }
1543
1544 pub fn background_executor(&self) -> &Arc<executor::Background> {
1545 &self.app.ctx.background
1546 }
1547
1548 pub fn thread_pool(&self) -> &scoped_pool::Pool {
1549 &self.app.ctx.thread_pool
1550 }
1551
1552 pub fn halt_stream(&mut self) {
1553 self.halt_stream = true;
1554 }
1555
1556 pub fn model_id(&self) -> usize {
1557 self.model_id
1558 }
1559
1560 pub fn add_model<S, F>(&mut self, build_model: F) -> ModelHandle<S>
1561 where
1562 S: Entity,
1563 F: FnOnce(&mut ModelContext<S>) -> S,
1564 {
1565 self.app.add_model(build_model)
1566 }
1567
1568 pub fn subscribe<S: Entity, F>(&mut self, handle: &ModelHandle<S>, mut callback: F)
1569 where
1570 S::Event: 'static,
1571 F: 'static + FnMut(&mut T, &S::Event, &mut ModelContext<T>),
1572 {
1573 self.app
1574 .subscriptions
1575 .entry(handle.model_id)
1576 .or_default()
1577 .push(Subscription::FromModel {
1578 model_id: self.model_id,
1579 callback: Box::new(move |model, payload, app, model_id| {
1580 let model = model.downcast_mut().expect("downcast is type safe");
1581 let payload = payload.downcast_ref().expect("downcast is type safe");
1582 let mut ctx = ModelContext::new(app, model_id);
1583 callback(model, payload, &mut ctx);
1584 }),
1585 });
1586 }
1587
1588 pub fn emit(&mut self, payload: T::Event) {
1589 self.app.pending_effects.push_back(Effect::Event {
1590 entity_id: self.model_id,
1591 payload: Box::new(payload),
1592 });
1593 }
1594
1595 pub fn observe<S, F>(&mut self, handle: &ModelHandle<S>, mut callback: F)
1596 where
1597 S: Entity,
1598 F: 'static + FnMut(&mut T, ModelHandle<S>, &mut ModelContext<T>),
1599 {
1600 self.app
1601 .model_observations
1602 .entry(handle.model_id)
1603 .or_default()
1604 .push(ModelObservation::FromModel {
1605 model_id: self.model_id,
1606 callback: Box::new(move |model, observed_id, app, model_id| {
1607 let model = model.downcast_mut().expect("downcast is type safe");
1608 let observed = ModelHandle::new(observed_id, &app.ctx.ref_counts);
1609 let mut ctx = ModelContext::new(app, model_id);
1610 callback(model, observed, &mut ctx);
1611 }),
1612 });
1613 }
1614
1615 pub fn notify(&mut self) {
1616 self.app
1617 .pending_effects
1618 .push_back(Effect::ModelNotification {
1619 model_id: self.model_id,
1620 });
1621 }
1622
1623 pub fn handle(&self) -> ModelHandle<T> {
1624 ModelHandle::new(self.model_id, &self.app.ctx.ref_counts)
1625 }
1626
1627 pub fn spawn<S, F, U>(&mut self, future: S, callback: F) -> EntityTask<U>
1628 where
1629 S: 'static + Future,
1630 F: 'static + FnOnce(&mut T, S::Output, &mut ModelContext<T>) -> U,
1631 U: 'static,
1632 {
1633 let handle = self.handle();
1634 let weak_handle = handle.downgrade();
1635 let task = self
1636 .app
1637 .spawn::<S, U>(Spawner::Model(handle.into()), future);
1638
1639 self.app.future_handlers.borrow_mut().insert(
1640 task.id,
1641 Box::new(move |output, ctx| {
1642 weak_handle.upgrade(ctx.as_ref()).map(|handle| {
1643 let output = *output.downcast().unwrap();
1644 handle.update(ctx, |model, ctx| {
1645 Box::new(callback(model, output, ctx)) as Box<dyn Any>
1646 })
1647 })
1648 }),
1649 );
1650
1651 task
1652 }
1653
1654 pub fn spawn_stream<S, F, G, U>(
1655 &mut self,
1656 stream: S,
1657 mut item_callback: F,
1658 done_callback: G,
1659 ) -> EntityTask<U>
1660 where
1661 S: 'static + Stream + Unpin,
1662 F: 'static + FnMut(&mut T, S::Item, &mut ModelContext<T>),
1663 G: 'static + FnOnce(&mut T, &mut ModelContext<T>) -> U,
1664 U: 'static + Any,
1665 {
1666 let handle = self.handle();
1667 let weak_handle = handle.downgrade();
1668 let task = self.app.spawn_stream(Spawner::Model(handle.into()), stream);
1669
1670 self.app.stream_handlers.borrow_mut().insert(
1671 task.id,
1672 StreamHandler {
1673 item_callback: {
1674 let weak_handle = weak_handle.clone();
1675 Box::new(move |output, app| {
1676 if let Some(handle) = weak_handle.upgrade(app.as_ref()) {
1677 let output = *output.downcast().unwrap();
1678 handle.update(app, |model, ctx| {
1679 item_callback(model, output, ctx);
1680 ctx.halt_stream
1681 })
1682 } else {
1683 true
1684 }
1685 })
1686 },
1687 done_callback: Box::new(move |app| {
1688 weak_handle.upgrade(app.as_ref()).map(|handle| {
1689 handle.update(app, |model, ctx| Box::new(done_callback(model, ctx)))
1690 as Box<dyn Any>
1691 })
1692 }),
1693 },
1694 );
1695
1696 task
1697 }
1698}
1699
1700impl<M> AsRef<AppContext> for ModelContext<'_, M> {
1701 fn as_ref(&self) -> &AppContext {
1702 &self.app.ctx
1703 }
1704}
1705
1706impl<M> AsMut<MutableAppContext> for ModelContext<'_, M> {
1707 fn as_mut(&mut self) -> &mut MutableAppContext {
1708 self.app
1709 }
1710}
1711
1712impl<M> ReadModel for ModelContext<'_, M> {
1713 fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T {
1714 self.app.read_model(handle)
1715 }
1716}
1717
1718impl<M> UpdateModel for ModelContext<'_, M> {
1719 fn update_model<T, F, S>(&mut self, handle: &ModelHandle<T>, update: F) -> S
1720 where
1721 T: Entity,
1722 F: FnOnce(&mut T, &mut ModelContext<T>) -> S,
1723 {
1724 self.app.update_model(handle, update)
1725 }
1726}
1727
1728pub struct ViewContext<'a, T: ?Sized> {
1729 app: &'a mut MutableAppContext,
1730 window_id: usize,
1731 view_id: usize,
1732 view_type: PhantomData<T>,
1733 halt_action_dispatch: bool,
1734 halt_stream: bool,
1735}
1736
1737impl<'a, T: View> ViewContext<'a, T> {
1738 fn new(app: &'a mut MutableAppContext, window_id: usize, view_id: usize) -> Self {
1739 Self {
1740 app,
1741 window_id,
1742 view_id,
1743 view_type: PhantomData,
1744 halt_action_dispatch: true,
1745 halt_stream: false,
1746 }
1747 }
1748
1749 pub fn handle(&self) -> ViewHandle<T> {
1750 ViewHandle::new(self.window_id, self.view_id, &self.app.ctx.ref_counts)
1751 }
1752
1753 pub fn window_id(&self) -> usize {
1754 self.window_id
1755 }
1756
1757 pub fn view_id(&self) -> usize {
1758 self.view_id
1759 }
1760
1761 pub fn foreground(&self) -> &Rc<executor::Foreground> {
1762 self.app.foreground_executor()
1763 }
1764
1765 pub fn background_executor(&self) -> &Arc<executor::Background> {
1766 &self.app.ctx.background
1767 }
1768
1769 pub fn prompt_for_paths<F>(&self, options: PathPromptOptions, done_fn: F)
1770 where
1771 F: 'static + FnOnce(Option<Vec<PathBuf>>, &mut MutableAppContext),
1772 {
1773 self.app.prompt_for_paths(options, done_fn)
1774 }
1775
1776 pub fn prompt_for_new_path<F>(&self, directory: &Path, done_fn: F)
1777 where
1778 F: 'static + FnOnce(Option<PathBuf>, &mut MutableAppContext),
1779 {
1780 self.app.prompt_for_new_path(directory, done_fn)
1781 }
1782
1783 pub fn debug_elements(&self) -> crate::json::Value {
1784 self.app.debug_elements(self.window_id).unwrap()
1785 }
1786
1787 pub fn focus<S>(&mut self, handle: S)
1788 where
1789 S: Into<AnyViewHandle>,
1790 {
1791 let handle = handle.into();
1792 self.app.pending_effects.push_back(Effect::Focus {
1793 window_id: handle.window_id,
1794 view_id: handle.view_id,
1795 });
1796 }
1797
1798 pub fn focus_self(&mut self) {
1799 self.app.pending_effects.push_back(Effect::Focus {
1800 window_id: self.window_id,
1801 view_id: self.view_id,
1802 });
1803 }
1804
1805 pub fn add_model<S, F>(&mut self, build_model: F) -> ModelHandle<S>
1806 where
1807 S: Entity,
1808 F: FnOnce(&mut ModelContext<S>) -> S,
1809 {
1810 self.app.add_model(build_model)
1811 }
1812
1813 pub fn add_view<S, F>(&mut self, build_view: F) -> ViewHandle<S>
1814 where
1815 S: View,
1816 F: FnOnce(&mut ViewContext<S>) -> S,
1817 {
1818 self.app.add_view(self.window_id, build_view)
1819 }
1820
1821 pub fn add_option_view<S, F>(&mut self, build_view: F) -> Option<ViewHandle<S>>
1822 where
1823 S: View,
1824 F: FnOnce(&mut ViewContext<S>) -> Option<S>,
1825 {
1826 self.app.add_option_view(self.window_id, build_view)
1827 }
1828
1829 pub fn subscribe_to_model<E, F>(&mut self, handle: &ModelHandle<E>, mut callback: F)
1830 where
1831 E: Entity,
1832 E::Event: 'static,
1833 F: 'static + FnMut(&mut T, ModelHandle<E>, &E::Event, &mut ViewContext<T>),
1834 {
1835 let emitter_handle = handle.downgrade();
1836 self.subscribe(handle, move |model, payload, ctx| {
1837 if let Some(emitter_handle) = emitter_handle.upgrade(ctx.as_ref()) {
1838 callback(model, emitter_handle, payload, ctx);
1839 }
1840 });
1841 }
1842
1843 pub fn subscribe_to_view<V, F>(&mut self, handle: &ViewHandle<V>, mut callback: F)
1844 where
1845 V: View,
1846 V::Event: 'static,
1847 F: 'static + FnMut(&mut T, ViewHandle<V>, &V::Event, &mut ViewContext<T>),
1848 {
1849 let emitter_handle = handle.downgrade();
1850 self.subscribe(handle, move |view, payload, ctx| {
1851 if let Some(emitter_handle) = emitter_handle.upgrade(ctx.as_ref()) {
1852 callback(view, emitter_handle, payload, ctx);
1853 }
1854 });
1855 }
1856
1857 pub fn subscribe<E, F>(&mut self, handle: &impl Handle<E>, mut callback: F)
1858 where
1859 E: Entity,
1860 E::Event: 'static,
1861 F: 'static + FnMut(&mut T, &E::Event, &mut ViewContext<T>),
1862 {
1863 self.app
1864 .subscriptions
1865 .entry(handle.id())
1866 .or_default()
1867 .push(Subscription::FromView {
1868 window_id: self.window_id,
1869 view_id: self.view_id,
1870 callback: Box::new(move |entity, payload, app, window_id, view_id| {
1871 let entity = entity.downcast_mut().expect("downcast is type safe");
1872 let payload = payload.downcast_ref().expect("downcast is type safe");
1873 let mut ctx = ViewContext::new(app, window_id, view_id);
1874 callback(entity, payload, &mut ctx);
1875 }),
1876 });
1877 }
1878
1879 pub fn emit(&mut self, payload: T::Event) {
1880 self.app.pending_effects.push_back(Effect::Event {
1881 entity_id: self.view_id,
1882 payload: Box::new(payload),
1883 });
1884 }
1885
1886 pub fn observe_model<S, F>(&mut self, handle: &ModelHandle<S>, mut callback: F)
1887 where
1888 S: Entity,
1889 F: 'static + FnMut(&mut T, ModelHandle<S>, &mut ViewContext<T>),
1890 {
1891 self.app
1892 .model_observations
1893 .entry(handle.id())
1894 .or_default()
1895 .push(ModelObservation::FromView {
1896 window_id: self.window_id,
1897 view_id: self.view_id,
1898 callback: Box::new(move |view, observed_id, app, window_id, view_id| {
1899 let view = view.downcast_mut().expect("downcast is type safe");
1900 let observed = ModelHandle::new(observed_id, &app.ctx.ref_counts);
1901 let mut ctx = ViewContext::new(app, window_id, view_id);
1902 callback(view, observed, &mut ctx);
1903 }),
1904 });
1905 }
1906
1907 pub fn observe_view<S, F>(&mut self, handle: &ViewHandle<S>, mut callback: F)
1908 where
1909 S: View,
1910 F: 'static + FnMut(&mut T, ViewHandle<S>, &mut ViewContext<T>),
1911 {
1912 self.app
1913 .view_observations
1914 .entry(handle.id())
1915 .or_default()
1916 .push(ViewObservation {
1917 window_id: self.window_id,
1918 view_id: self.view_id,
1919 callback: Box::new(
1920 move |view,
1921 observed_view_id,
1922 observed_window_id,
1923 app,
1924 observing_window_id,
1925 observing_view_id| {
1926 let view = view.downcast_mut().expect("downcast is type safe");
1927 let observed_handle = ViewHandle::new(
1928 observed_view_id,
1929 observed_window_id,
1930 &app.ctx.ref_counts,
1931 );
1932 let mut ctx = ViewContext::new(app, observing_window_id, observing_view_id);
1933 callback(view, observed_handle, &mut ctx);
1934 },
1935 ),
1936 });
1937 }
1938
1939 pub fn notify(&mut self) {
1940 self.app.notify_view(self.window_id, self.view_id);
1941 }
1942
1943 pub fn propagate_action(&mut self) {
1944 self.halt_action_dispatch = false;
1945 }
1946
1947 pub fn halt_stream(&mut self) {
1948 self.halt_stream = true;
1949 }
1950
1951 pub fn spawn<S, F, U>(&mut self, future: S, callback: F) -> EntityTask<U>
1952 where
1953 S: 'static + Future,
1954 F: 'static + FnOnce(&mut T, S::Output, &mut ViewContext<T>) -> U,
1955 U: 'static,
1956 {
1957 let handle = self.handle();
1958 let weak_handle = handle.downgrade();
1959 let task = self.app.spawn(Spawner::View(handle.into()), future);
1960
1961 self.app.future_handlers.borrow_mut().insert(
1962 task.id,
1963 Box::new(move |output, app| {
1964 weak_handle.upgrade(app.as_ref()).map(|handle| {
1965 let output = *output.downcast().unwrap();
1966 handle.update(app, |view, ctx| {
1967 Box::new(callback(view, output, ctx)) as Box<dyn Any>
1968 })
1969 })
1970 }),
1971 );
1972
1973 task
1974 }
1975
1976 pub fn spawn_stream<S, F, G, U>(
1977 &mut self,
1978 stream: S,
1979 mut item_callback: F,
1980 done_callback: G,
1981 ) -> EntityTask<U>
1982 where
1983 S: 'static + Stream + Unpin,
1984 F: 'static + FnMut(&mut T, S::Item, &mut ViewContext<T>),
1985 G: 'static + FnOnce(&mut T, &mut ViewContext<T>) -> U,
1986 U: 'static + Any,
1987 {
1988 let handle = self.handle();
1989 let weak_handle = handle.downgrade();
1990 let task = self.app.spawn_stream(Spawner::View(handle.into()), stream);
1991 self.app.stream_handlers.borrow_mut().insert(
1992 task.id,
1993 StreamHandler {
1994 item_callback: {
1995 let weak_handle = weak_handle.clone();
1996 Box::new(move |output, ctx| {
1997 if let Some(handle) = weak_handle.upgrade(ctx.as_ref()) {
1998 let output = *output.downcast().unwrap();
1999 handle.update(ctx, |view, ctx| {
2000 item_callback(view, output, ctx);
2001 ctx.halt_stream
2002 })
2003 } else {
2004 true
2005 }
2006 })
2007 },
2008 done_callback: Box::new(move |ctx| {
2009 weak_handle.upgrade(ctx.as_ref()).map(|handle| {
2010 handle.update(ctx, |view, ctx| {
2011 Box::new(done_callback(view, ctx)) as Box<dyn Any>
2012 })
2013 })
2014 }),
2015 },
2016 );
2017 task
2018 }
2019}
2020
2021impl AsRef<AppContext> for &AppContext {
2022 fn as_ref(&self) -> &AppContext {
2023 self
2024 }
2025}
2026
2027impl<M> AsRef<AppContext> for ViewContext<'_, M> {
2028 fn as_ref(&self) -> &AppContext {
2029 &self.app.ctx
2030 }
2031}
2032
2033impl<M> AsMut<MutableAppContext> for ViewContext<'_, M> {
2034 fn as_mut(&mut self) -> &mut MutableAppContext {
2035 self.app
2036 }
2037}
2038
2039impl<V> ReadModel for ViewContext<'_, V> {
2040 fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T {
2041 self.app.read_model(handle)
2042 }
2043}
2044
2045impl<V: View> UpdateModel for ViewContext<'_, V> {
2046 fn update_model<T, F, S>(&mut self, handle: &ModelHandle<T>, update: F) -> S
2047 where
2048 T: Entity,
2049 F: FnOnce(&mut T, &mut ModelContext<T>) -> S,
2050 {
2051 self.app.update_model(handle, update)
2052 }
2053}
2054
2055impl<V: View> ReadView for ViewContext<'_, V> {
2056 fn read_view<T: View>(&self, handle: &ViewHandle<T>) -> &T {
2057 self.app.read_view(handle)
2058 }
2059}
2060
2061impl<V: View> UpdateView for ViewContext<'_, V> {
2062 fn update_view<T, F, S>(&mut self, handle: &ViewHandle<T>, update: F) -> S
2063 where
2064 T: View,
2065 F: FnOnce(&mut T, &mut ViewContext<T>) -> S,
2066 {
2067 self.app.update_view(handle, update)
2068 }
2069}
2070
2071pub trait Handle<T> {
2072 fn id(&self) -> usize;
2073 fn location(&self) -> EntityLocation;
2074}
2075
2076#[derive(Clone, Copy, Debug, Eq, PartialEq, Hash)]
2077pub enum EntityLocation {
2078 Model(usize),
2079 View(usize, usize),
2080}
2081
2082pub struct ModelHandle<T> {
2083 model_id: usize,
2084 model_type: PhantomData<T>,
2085 ref_counts: Arc<Mutex<RefCounts>>,
2086}
2087
2088impl<T: Entity> ModelHandle<T> {
2089 fn new(model_id: usize, ref_counts: &Arc<Mutex<RefCounts>>) -> Self {
2090 ref_counts.lock().inc_entity(model_id);
2091 Self {
2092 model_id,
2093 model_type: PhantomData,
2094 ref_counts: ref_counts.clone(),
2095 }
2096 }
2097
2098 pub fn downgrade(&self) -> WeakModelHandle<T> {
2099 WeakModelHandle::new(self.model_id)
2100 }
2101
2102 pub fn id(&self) -> usize {
2103 self.model_id
2104 }
2105
2106 pub fn read<'a, A: ReadModel>(&self, app: &'a A) -> &'a T {
2107 app.read_model(self)
2108 }
2109
2110 pub fn update<A, F, S>(&self, app: &mut A, update: F) -> S
2111 where
2112 A: UpdateModel,
2113 F: FnOnce(&mut T, &mut ModelContext<T>) -> S,
2114 {
2115 app.update_model(self, update)
2116 }
2117
2118 pub fn condition(
2119 &self,
2120 ctx: &TestAppContext,
2121 predicate: impl FnMut(&T, &AppContext) -> bool,
2122 ) -> impl Future<Output = ()> {
2123 self.condition_with_duration(Duration::from_millis(100), ctx, predicate)
2124 }
2125
2126 pub fn condition_with_duration(
2127 &self,
2128 duration: Duration,
2129 ctx: &TestAppContext,
2130 mut predicate: impl FnMut(&T, &AppContext) -> bool,
2131 ) -> impl Future<Output = ()> {
2132 let (tx, mut rx) = mpsc::channel(1024);
2133
2134 let mut ctx = ctx.0.borrow_mut();
2135 self.update(&mut *ctx, |_, ctx| {
2136 ctx.observe(self, {
2137 let mut tx = tx.clone();
2138 move |_, _, _| {
2139 tx.blocking_send(()).ok();
2140 }
2141 });
2142 ctx.subscribe(self, {
2143 let mut tx = tx.clone();
2144 move |_, _, _| {
2145 tx.blocking_send(()).ok();
2146 }
2147 })
2148 });
2149
2150 let ctx = ctx.weak_self.as_ref().unwrap().upgrade().unwrap();
2151 let handle = self.downgrade();
2152
2153 async move {
2154 timeout(duration, async move {
2155 loop {
2156 {
2157 let ctx = ctx.borrow();
2158 let ctx = ctx.as_ref();
2159 if predicate(
2160 handle
2161 .upgrade(ctx)
2162 .expect("model dropped with pending condition")
2163 .read(ctx),
2164 ctx,
2165 ) {
2166 break;
2167 }
2168 }
2169
2170 rx.recv()
2171 .await
2172 .expect("model dropped with pending condition");
2173 }
2174 })
2175 .await
2176 .expect("condition timed out");
2177 }
2178 }
2179}
2180
2181impl<T> Clone for ModelHandle<T> {
2182 fn clone(&self) -> Self {
2183 self.ref_counts.lock().inc_entity(self.model_id);
2184 Self {
2185 model_id: self.model_id,
2186 model_type: PhantomData,
2187 ref_counts: self.ref_counts.clone(),
2188 }
2189 }
2190}
2191
2192impl<T> PartialEq for ModelHandle<T> {
2193 fn eq(&self, other: &Self) -> bool {
2194 self.model_id == other.model_id
2195 }
2196}
2197
2198impl<T> Eq for ModelHandle<T> {}
2199
2200impl<T> Hash for ModelHandle<T> {
2201 fn hash<H: Hasher>(&self, state: &mut H) {
2202 self.model_id.hash(state);
2203 }
2204}
2205
2206impl<T> std::borrow::Borrow<usize> for ModelHandle<T> {
2207 fn borrow(&self) -> &usize {
2208 &self.model_id
2209 }
2210}
2211
2212impl<T> Debug for ModelHandle<T> {
2213 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
2214 f.debug_tuple(&format!("ModelHandle<{}>", type_name::<T>()))
2215 .field(&self.model_id)
2216 .finish()
2217 }
2218}
2219
2220unsafe impl<T> Send for ModelHandle<T> {}
2221unsafe impl<T> Sync for ModelHandle<T> {}
2222
2223impl<T> Drop for ModelHandle<T> {
2224 fn drop(&mut self) {
2225 self.ref_counts.lock().dec_model(self.model_id);
2226 }
2227}
2228
2229impl<T> Handle<T> for ModelHandle<T> {
2230 fn id(&self) -> usize {
2231 self.model_id
2232 }
2233
2234 fn location(&self) -> EntityLocation {
2235 EntityLocation::Model(self.model_id)
2236 }
2237}
2238
2239pub struct WeakModelHandle<T> {
2240 model_id: usize,
2241 model_type: PhantomData<T>,
2242}
2243
2244impl<T: Entity> WeakModelHandle<T> {
2245 fn new(model_id: usize) -> Self {
2246 Self {
2247 model_id,
2248 model_type: PhantomData,
2249 }
2250 }
2251
2252 pub fn upgrade(&self, app: &AppContext) -> Option<ModelHandle<T>> {
2253 if app.models.contains_key(&self.model_id) {
2254 Some(ModelHandle::new(self.model_id, &app.ref_counts))
2255 } else {
2256 None
2257 }
2258 }
2259}
2260
2261impl<T> Clone for WeakModelHandle<T> {
2262 fn clone(&self) -> Self {
2263 Self {
2264 model_id: self.model_id,
2265 model_type: PhantomData,
2266 }
2267 }
2268}
2269
2270pub struct ViewHandle<T> {
2271 window_id: usize,
2272 view_id: usize,
2273 view_type: PhantomData<T>,
2274 ref_counts: Arc<Mutex<RefCounts>>,
2275}
2276
2277impl<T: View> ViewHandle<T> {
2278 fn new(window_id: usize, view_id: usize, ref_counts: &Arc<Mutex<RefCounts>>) -> Self {
2279 ref_counts.lock().inc_entity(view_id);
2280 Self {
2281 window_id,
2282 view_id,
2283 view_type: PhantomData,
2284 ref_counts: ref_counts.clone(),
2285 }
2286 }
2287
2288 pub fn downgrade(&self) -> WeakViewHandle<T> {
2289 WeakViewHandle::new(self.window_id, self.view_id)
2290 }
2291
2292 pub fn window_id(&self) -> usize {
2293 self.window_id
2294 }
2295
2296 pub fn id(&self) -> usize {
2297 self.view_id
2298 }
2299
2300 pub fn read<'a, A: ReadView>(&self, app: &'a A) -> &'a T {
2301 app.read_view(self)
2302 }
2303
2304 pub fn update<A, F, S>(&self, app: &mut A, update: F) -> S
2305 where
2306 A: UpdateView,
2307 F: FnOnce(&mut T, &mut ViewContext<T>) -> S,
2308 {
2309 app.update_view(self, update)
2310 }
2311
2312 pub fn is_focused(&self, app: &AppContext) -> bool {
2313 app.focused_view_id(self.window_id)
2314 .map_or(false, |focused_id| focused_id == self.view_id)
2315 }
2316
2317 pub fn condition(
2318 &self,
2319 ctx: &TestAppContext,
2320 predicate: impl FnMut(&T, &AppContext) -> bool,
2321 ) -> impl Future<Output = ()> {
2322 self.condition_with_duration(Duration::from_millis(500), ctx, predicate)
2323 }
2324
2325 pub fn condition_with_duration(
2326 &self,
2327 duration: Duration,
2328 ctx: &TestAppContext,
2329 mut predicate: impl FnMut(&T, &AppContext) -> bool,
2330 ) -> impl Future<Output = ()> {
2331 let (tx, mut rx) = mpsc::channel(1024);
2332
2333 let mut ctx = ctx.0.borrow_mut();
2334 self.update(&mut *ctx, |_, ctx| {
2335 ctx.observe_view(self, {
2336 let mut tx = tx.clone();
2337 move |_, _, _| {
2338 tx.blocking_send(()).ok();
2339 }
2340 });
2341
2342 ctx.subscribe(self, {
2343 let mut tx = tx.clone();
2344 move |_, _, _| {
2345 tx.blocking_send(()).ok();
2346 }
2347 })
2348 });
2349
2350 let ctx = ctx.weak_self.as_ref().unwrap().upgrade().unwrap();
2351 let handle = self.downgrade();
2352
2353 async move {
2354 timeout(duration, async move {
2355 loop {
2356 {
2357 let ctx = ctx.borrow();
2358 let ctx = ctx.as_ref();
2359 if predicate(
2360 handle
2361 .upgrade(ctx)
2362 .expect("view dropped with pending condition")
2363 .read(ctx),
2364 ctx,
2365 ) {
2366 break;
2367 }
2368 }
2369
2370 rx.recv()
2371 .await
2372 .expect("view dropped with pending condition");
2373 }
2374 })
2375 .await
2376 .expect("condition timed out");
2377 }
2378 }
2379}
2380
2381impl<T> Clone for ViewHandle<T> {
2382 fn clone(&self) -> Self {
2383 self.ref_counts.lock().inc_entity(self.view_id);
2384 Self {
2385 window_id: self.window_id,
2386 view_id: self.view_id,
2387 view_type: PhantomData,
2388 ref_counts: self.ref_counts.clone(),
2389 }
2390 }
2391}
2392
2393impl<T> PartialEq for ViewHandle<T> {
2394 fn eq(&self, other: &Self) -> bool {
2395 self.window_id == other.window_id && self.view_id == other.view_id
2396 }
2397}
2398
2399impl<T> Eq for ViewHandle<T> {}
2400
2401impl<T> Debug for ViewHandle<T> {
2402 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
2403 f.debug_struct(&format!("ViewHandle<{}>", type_name::<T>()))
2404 .field("window_id", &self.window_id)
2405 .field("view_id", &self.view_id)
2406 .finish()
2407 }
2408}
2409
2410impl<T> Drop for ViewHandle<T> {
2411 fn drop(&mut self) {
2412 self.ref_counts
2413 .lock()
2414 .dec_view(self.window_id, self.view_id);
2415 }
2416}
2417
2418impl<T> Handle<T> for ViewHandle<T> {
2419 fn id(&self) -> usize {
2420 self.view_id
2421 }
2422
2423 fn location(&self) -> EntityLocation {
2424 EntityLocation::View(self.window_id, self.view_id)
2425 }
2426}
2427
2428pub struct AnyViewHandle {
2429 window_id: usize,
2430 view_id: usize,
2431 view_type: TypeId,
2432 ref_counts: Arc<Mutex<RefCounts>>,
2433}
2434
2435impl AnyViewHandle {
2436 pub fn id(&self) -> usize {
2437 self.view_id
2438 }
2439
2440 pub fn is<T: 'static>(&self) -> bool {
2441 TypeId::of::<T>() == self.view_type
2442 }
2443
2444 pub fn downcast<T: View>(self) -> Option<ViewHandle<T>> {
2445 if self.is::<T>() {
2446 let result = Some(ViewHandle {
2447 window_id: self.window_id,
2448 view_id: self.view_id,
2449 ref_counts: self.ref_counts.clone(),
2450 view_type: PhantomData,
2451 });
2452 unsafe {
2453 Arc::decrement_strong_count(&self.ref_counts);
2454 }
2455 std::mem::forget(self);
2456 result
2457 } else {
2458 None
2459 }
2460 }
2461}
2462
2463impl Clone for AnyViewHandle {
2464 fn clone(&self) -> Self {
2465 self.ref_counts.lock().inc_entity(self.view_id);
2466 Self {
2467 window_id: self.window_id,
2468 view_id: self.view_id,
2469 view_type: self.view_type,
2470 ref_counts: self.ref_counts.clone(),
2471 }
2472 }
2473}
2474
2475impl<T: View> From<&ViewHandle<T>> for AnyViewHandle {
2476 fn from(handle: &ViewHandle<T>) -> Self {
2477 handle.ref_counts.lock().inc_entity(handle.view_id);
2478 AnyViewHandle {
2479 window_id: handle.window_id,
2480 view_id: handle.view_id,
2481 view_type: TypeId::of::<T>(),
2482 ref_counts: handle.ref_counts.clone(),
2483 }
2484 }
2485}
2486
2487impl<T: View> From<ViewHandle<T>> for AnyViewHandle {
2488 fn from(handle: ViewHandle<T>) -> Self {
2489 let any_handle = AnyViewHandle {
2490 window_id: handle.window_id,
2491 view_id: handle.view_id,
2492 view_type: TypeId::of::<T>(),
2493 ref_counts: handle.ref_counts.clone(),
2494 };
2495 unsafe {
2496 Arc::decrement_strong_count(&handle.ref_counts);
2497 }
2498 std::mem::forget(handle);
2499 any_handle
2500 }
2501}
2502
2503impl Drop for AnyViewHandle {
2504 fn drop(&mut self) {
2505 self.ref_counts
2506 .lock()
2507 .dec_view(self.window_id, self.view_id);
2508 }
2509}
2510
2511pub struct AnyModelHandle {
2512 model_id: usize,
2513 ref_counts: Arc<Mutex<RefCounts>>,
2514}
2515
2516impl<T: Entity> From<ModelHandle<T>> for AnyModelHandle {
2517 fn from(handle: ModelHandle<T>) -> Self {
2518 handle.ref_counts.lock().inc_entity(handle.model_id);
2519 Self {
2520 model_id: handle.model_id,
2521 ref_counts: handle.ref_counts.clone(),
2522 }
2523 }
2524}
2525
2526impl Drop for AnyModelHandle {
2527 fn drop(&mut self) {
2528 self.ref_counts.lock().dec_model(self.model_id);
2529 }
2530}
2531pub struct WeakViewHandle<T> {
2532 window_id: usize,
2533 view_id: usize,
2534 view_type: PhantomData<T>,
2535}
2536
2537impl<T: View> WeakViewHandle<T> {
2538 fn new(window_id: usize, view_id: usize) -> Self {
2539 Self {
2540 window_id,
2541 view_id,
2542 view_type: PhantomData,
2543 }
2544 }
2545
2546 pub fn upgrade(&self, ctx: impl AsRef<AppContext>) -> Option<ViewHandle<T>> {
2547 let ctx = ctx.as_ref();
2548 if ctx.ref_counts.lock().is_entity_alive(self.view_id) {
2549 Some(ViewHandle::new(
2550 self.window_id,
2551 self.view_id,
2552 &ctx.ref_counts,
2553 ))
2554 } else {
2555 None
2556 }
2557 }
2558}
2559
2560impl<T> Clone for WeakViewHandle<T> {
2561 fn clone(&self) -> Self {
2562 Self {
2563 window_id: self.window_id,
2564 view_id: self.view_id,
2565 view_type: PhantomData,
2566 }
2567 }
2568}
2569
2570pub struct ValueHandle<T> {
2571 value_type: PhantomData<T>,
2572 tag_type_id: TypeId,
2573 id: usize,
2574 ref_counts: Weak<Mutex<RefCounts>>,
2575}
2576
2577impl<T: 'static> ValueHandle<T> {
2578 fn new(tag_type_id: TypeId, id: usize, ref_counts: &Arc<Mutex<RefCounts>>) -> Self {
2579 ref_counts.lock().inc_value(tag_type_id, id);
2580 Self {
2581 value_type: PhantomData,
2582 tag_type_id,
2583 id,
2584 ref_counts: Arc::downgrade(ref_counts),
2585 }
2586 }
2587
2588 pub fn read<R>(&self, ctx: &AppContext, f: impl FnOnce(&T) -> R) -> R {
2589 f(ctx
2590 .values
2591 .read()
2592 .get(&(self.tag_type_id, self.id))
2593 .unwrap()
2594 .downcast_ref()
2595 .unwrap())
2596 }
2597
2598 pub fn update<R>(&self, ctx: &AppContext, f: impl FnOnce(&mut T) -> R) -> R {
2599 f(ctx
2600 .values
2601 .write()
2602 .get_mut(&(self.tag_type_id, self.id))
2603 .unwrap()
2604 .downcast_mut()
2605 .unwrap())
2606 }
2607}
2608
2609impl<T> Drop for ValueHandle<T> {
2610 fn drop(&mut self) {
2611 if let Some(ref_counts) = self.ref_counts.upgrade() {
2612 ref_counts.lock().dec_value(self.tag_type_id, self.id);
2613 }
2614 }
2615}
2616
2617#[derive(Default)]
2618struct RefCounts {
2619 entity_counts: HashMap<usize, usize>,
2620 value_counts: HashMap<(TypeId, usize), usize>,
2621 dropped_models: HashSet<usize>,
2622 dropped_views: HashSet<(usize, usize)>,
2623 dropped_values: HashSet<(TypeId, usize)>,
2624}
2625
2626impl RefCounts {
2627 fn inc_entity(&mut self, entity_id: usize) {
2628 *self.entity_counts.entry(entity_id).or_insert(0) += 1;
2629 }
2630
2631 fn inc_value(&mut self, tag_type_id: TypeId, id: usize) {
2632 *self.value_counts.entry((tag_type_id, id)).or_insert(0) += 1;
2633 }
2634
2635 fn dec_model(&mut self, model_id: usize) {
2636 let count = self.entity_counts.get_mut(&model_id).unwrap();
2637 *count -= 1;
2638 if *count == 0 {
2639 self.entity_counts.remove(&model_id);
2640 self.dropped_models.insert(model_id);
2641 }
2642 }
2643
2644 fn dec_view(&mut self, window_id: usize, view_id: usize) {
2645 let count = self.entity_counts.get_mut(&view_id).unwrap();
2646 *count -= 1;
2647 if *count == 0 {
2648 self.entity_counts.remove(&view_id);
2649 self.dropped_views.insert((window_id, view_id));
2650 }
2651 }
2652
2653 fn dec_value(&mut self, tag_type_id: TypeId, id: usize) {
2654 let key = (tag_type_id, id);
2655 let count = self.value_counts.get_mut(&key).unwrap();
2656 *count -= 1;
2657 if *count == 0 {
2658 self.value_counts.remove(&key);
2659 self.dropped_values.insert(key);
2660 }
2661 }
2662
2663 fn is_entity_alive(&self, entity_id: usize) -> bool {
2664 self.entity_counts.contains_key(&entity_id)
2665 }
2666
2667 fn take_dropped(
2668 &mut self,
2669 ) -> (
2670 HashSet<usize>,
2671 HashSet<(usize, usize)>,
2672 HashSet<(TypeId, usize)>,
2673 ) {
2674 let mut dropped_models = HashSet::new();
2675 let mut dropped_views = HashSet::new();
2676 let mut dropped_values = HashSet::new();
2677 std::mem::swap(&mut self.dropped_models, &mut dropped_models);
2678 std::mem::swap(&mut self.dropped_views, &mut dropped_views);
2679 std::mem::swap(&mut self.dropped_values, &mut dropped_values);
2680 (dropped_models, dropped_views, dropped_values)
2681 }
2682}
2683
2684enum Subscription {
2685 FromModel {
2686 model_id: usize,
2687 callback: Box<dyn FnMut(&mut dyn Any, &dyn Any, &mut MutableAppContext, usize)>,
2688 },
2689 FromView {
2690 window_id: usize,
2691 view_id: usize,
2692 callback: Box<dyn FnMut(&mut dyn Any, &dyn Any, &mut MutableAppContext, usize, usize)>,
2693 },
2694}
2695
2696enum ModelObservation {
2697 FromModel {
2698 model_id: usize,
2699 callback: Box<dyn FnMut(&mut dyn Any, usize, &mut MutableAppContext, usize)>,
2700 },
2701 FromView {
2702 window_id: usize,
2703 view_id: usize,
2704 callback: Box<dyn FnMut(&mut dyn Any, usize, &mut MutableAppContext, usize, usize)>,
2705 },
2706}
2707
2708struct ViewObservation {
2709 window_id: usize,
2710 view_id: usize,
2711 callback: Box<dyn FnMut(&mut dyn Any, usize, usize, &mut MutableAppContext, usize, usize)>,
2712}
2713
2714type FutureHandler = Box<dyn FnOnce(Box<dyn Any>, &mut MutableAppContext) -> Option<Box<dyn Any>>>;
2715
2716struct StreamHandler {
2717 item_callback: Box<dyn FnMut(Box<dyn Any>, &mut MutableAppContext) -> bool>,
2718 done_callback: Box<dyn FnOnce(&mut MutableAppContext) -> Option<Box<dyn Any>>>,
2719}
2720
2721#[must_use]
2722pub struct EntityTask<T> {
2723 id: usize,
2724 task: Option<executor::Task<Option<T>>>,
2725 _spawner: Spawner, // Keeps the spawning entity alive for as long as the task exists
2726 handler_map: TaskHandlerMap,
2727}
2728
2729pub enum Spawner {
2730 Model(AnyModelHandle),
2731 View(AnyViewHandle),
2732}
2733
2734enum TaskHandlerMap {
2735 Detached,
2736 Future(Rc<RefCell<HashMap<usize, FutureHandler>>>),
2737 Stream(Rc<RefCell<HashMap<usize, StreamHandler>>>),
2738}
2739
2740impl<T> EntityTask<T> {
2741 fn new(
2742 id: usize,
2743 task: executor::Task<Option<T>>,
2744 spawner: Spawner,
2745 handler_map: TaskHandlerMap,
2746 ) -> Self {
2747 Self {
2748 id,
2749 task: Some(task),
2750 _spawner: spawner,
2751 handler_map,
2752 }
2753 }
2754
2755 pub fn detach(mut self) {
2756 self.handler_map = TaskHandlerMap::Detached;
2757 self.task.take().unwrap().detach();
2758 }
2759
2760 pub async fn cancel(mut self) -> Option<T> {
2761 let task = self.task.take().unwrap();
2762 task.cancel().await.unwrap()
2763 }
2764}
2765
2766impl<T> Future for EntityTask<T> {
2767 type Output = T;
2768
2769 fn poll(
2770 self: std::pin::Pin<&mut Self>,
2771 ctx: &mut std::task::Context<'_>,
2772 ) -> std::task::Poll<Self::Output> {
2773 let task = unsafe { self.map_unchecked_mut(|task| task.task.as_mut().unwrap()) };
2774 task.poll(ctx).map(|output| output.unwrap())
2775 }
2776}
2777
2778impl<T> Drop for EntityTask<T> {
2779 fn drop(self: &mut Self) {
2780 match &self.handler_map {
2781 TaskHandlerMap::Detached => {
2782 return;
2783 }
2784 TaskHandlerMap::Future(map) => {
2785 map.borrow_mut().remove(&self.id);
2786 }
2787 TaskHandlerMap::Stream(map) => {
2788 map.borrow_mut().remove(&self.id);
2789 }
2790 }
2791 }
2792}
2793
2794#[cfg(test)]
2795mod tests {
2796 use super::*;
2797 use crate::elements::*;
2798 use smol::future::poll_once;
2799
2800 #[test]
2801 fn test_model_handles() {
2802 struct Model {
2803 other: Option<ModelHandle<Model>>,
2804 events: Vec<String>,
2805 }
2806
2807 impl Entity for Model {
2808 type Event = usize;
2809 }
2810
2811 impl Model {
2812 fn new(other: Option<ModelHandle<Self>>, ctx: &mut ModelContext<Self>) -> Self {
2813 if let Some(other) = other.as_ref() {
2814 ctx.observe(other, |me, _, _| {
2815 me.events.push("notified".into());
2816 });
2817 ctx.subscribe(other, |me, event, _| {
2818 me.events.push(format!("observed event {}", event));
2819 });
2820 }
2821
2822 Self {
2823 other,
2824 events: Vec::new(),
2825 }
2826 }
2827 }
2828
2829 App::test((), |app| {
2830 let handle_1 = app.add_model(|ctx| Model::new(None, ctx));
2831 let handle_2 = app.add_model(|ctx| Model::new(Some(handle_1.clone()), ctx));
2832 assert_eq!(app.ctx.models.len(), 2);
2833
2834 handle_1.update(app, |model, ctx| {
2835 model.events.push("updated".into());
2836 ctx.emit(1);
2837 ctx.notify();
2838 ctx.emit(2);
2839 });
2840 assert_eq!(handle_1.read(app).events, vec!["updated".to_string()]);
2841 assert_eq!(
2842 handle_2.read(app).events,
2843 vec![
2844 "observed event 1".to_string(),
2845 "notified".to_string(),
2846 "observed event 2".to_string(),
2847 ]
2848 );
2849
2850 handle_2.update(app, |model, _| {
2851 drop(handle_1);
2852 model.other.take();
2853 });
2854
2855 assert_eq!(app.ctx.models.len(), 1);
2856 assert!(app.subscriptions.is_empty());
2857 assert!(app.model_observations.is_empty());
2858 });
2859 }
2860
2861 #[test]
2862 fn test_subscribe_and_emit_from_model() {
2863 #[derive(Default)]
2864 struct Model {
2865 events: Vec<usize>,
2866 }
2867
2868 impl Entity for Model {
2869 type Event = usize;
2870 }
2871
2872 App::test((), |app| {
2873 let handle_1 = app.add_model(|_| Model::default());
2874 let handle_2 = app.add_model(|_| Model::default());
2875 let handle_2b = handle_2.clone();
2876
2877 handle_1.update(app, |_, c| {
2878 c.subscribe(&handle_2, move |model: &mut Model, event, c| {
2879 model.events.push(*event);
2880
2881 c.subscribe(&handle_2b, |model, event, _| {
2882 model.events.push(*event * 2);
2883 });
2884 });
2885 });
2886
2887 handle_2.update(app, |_, c| c.emit(7));
2888 assert_eq!(handle_1.read(app).events, vec![7]);
2889
2890 handle_2.update(app, |_, c| c.emit(5));
2891 assert_eq!(handle_1.read(app).events, vec![7, 10, 5]);
2892 })
2893 }
2894
2895 #[test]
2896 fn test_observe_and_notify_from_model() {
2897 #[derive(Default)]
2898 struct Model {
2899 count: usize,
2900 events: Vec<usize>,
2901 }
2902
2903 impl Entity for Model {
2904 type Event = ();
2905 }
2906
2907 App::test((), |app| {
2908 let handle_1 = app.add_model(|_| Model::default());
2909 let handle_2 = app.add_model(|_| Model::default());
2910 let handle_2b = handle_2.clone();
2911
2912 handle_1.update(app, |_, c| {
2913 c.observe(&handle_2, move |model, observed, c| {
2914 model.events.push(observed.read(c).count);
2915 c.observe(&handle_2b, |model, observed, c| {
2916 model.events.push(observed.read(c).count * 2);
2917 });
2918 });
2919 });
2920
2921 handle_2.update(app, |model, c| {
2922 model.count = 7;
2923 c.notify()
2924 });
2925 assert_eq!(handle_1.read(app).events, vec![7]);
2926
2927 handle_2.update(app, |model, c| {
2928 model.count = 5;
2929 c.notify()
2930 });
2931 assert_eq!(handle_1.read(app).events, vec![7, 10, 5])
2932 })
2933 }
2934
2935 #[test]
2936 fn test_spawn_from_model() {
2937 #[derive(Default)]
2938 struct Model {
2939 count: usize,
2940 }
2941
2942 impl Entity for Model {
2943 type Event = ();
2944 }
2945
2946 App::test_async((), |mut app| async move {
2947 let handle = app.add_model(|_| Model::default());
2948 handle
2949 .update(&mut app, |_, c| {
2950 c.spawn(async { 7 }, |model, output, _| {
2951 model.count = output;
2952 })
2953 })
2954 .await;
2955 app.read(|ctx| assert_eq!(handle.read(ctx).count, 7));
2956
2957 handle
2958 .update(&mut app, |_, c| {
2959 c.spawn(async { 14 }, |model, output, _| {
2960 model.count = output;
2961 })
2962 })
2963 .await;
2964 app.read(|ctx| assert_eq!(handle.read(ctx).count, 14));
2965 });
2966 }
2967
2968 #[test]
2969 fn test_spawn_stream_local_from_model() {
2970 #[derive(Default)]
2971 struct Model {
2972 events: Vec<Option<usize>>,
2973 }
2974
2975 impl Entity for Model {
2976 type Event = ();
2977 }
2978
2979 App::test_async((), |mut app| async move {
2980 let handle = app.add_model(|_| Model::default());
2981 handle
2982 .update(&mut app, |_, c| {
2983 c.spawn_stream(
2984 smol::stream::iter(vec![1, 2, 3]),
2985 |model, output, _| {
2986 model.events.push(Some(output));
2987 },
2988 |model, _| {
2989 model.events.push(None);
2990 },
2991 )
2992 })
2993 .await;
2994 app.read(|ctx| assert_eq!(handle.read(ctx).events, [Some(1), Some(2), Some(3), None]));
2995 })
2996 }
2997
2998 #[test]
2999 fn test_view_handles() {
3000 struct View {
3001 other: Option<ViewHandle<View>>,
3002 events: Vec<String>,
3003 }
3004
3005 impl Entity for View {
3006 type Event = usize;
3007 }
3008
3009 impl super::View for View {
3010 fn render<'a>(&self, _: &AppContext) -> ElementBox {
3011 Empty::new().boxed()
3012 }
3013
3014 fn ui_name() -> &'static str {
3015 "View"
3016 }
3017 }
3018
3019 impl View {
3020 fn new(other: Option<ViewHandle<View>>, ctx: &mut ViewContext<Self>) -> Self {
3021 if let Some(other) = other.as_ref() {
3022 ctx.subscribe_to_view(other, |me, _, event, _| {
3023 me.events.push(format!("observed event {}", event));
3024 });
3025 }
3026 Self {
3027 other,
3028 events: Vec::new(),
3029 }
3030 }
3031 }
3032
3033 App::test((), |app| {
3034 let (window_id, _) = app.add_window(|ctx| View::new(None, ctx));
3035 let handle_1 = app.add_view(window_id, |ctx| View::new(None, ctx));
3036 let handle_2 = app.add_view(window_id, |ctx| View::new(Some(handle_1.clone()), ctx));
3037 assert_eq!(app.ctx.views.len(), 3);
3038
3039 handle_1.update(app, |view, ctx| {
3040 view.events.push("updated".into());
3041 ctx.emit(1);
3042 ctx.emit(2);
3043 });
3044 assert_eq!(handle_1.read(app).events, vec!["updated".to_string()]);
3045 assert_eq!(
3046 handle_2.read(app).events,
3047 vec![
3048 "observed event 1".to_string(),
3049 "observed event 2".to_string(),
3050 ]
3051 );
3052
3053 handle_2.update(app, |view, _| {
3054 drop(handle_1);
3055 view.other.take();
3056 });
3057
3058 assert_eq!(app.ctx.views.len(), 2);
3059 assert!(app.subscriptions.is_empty());
3060 assert!(app.model_observations.is_empty());
3061 })
3062 }
3063
3064 #[test]
3065 fn test_subscribe_and_emit_from_view() {
3066 #[derive(Default)]
3067 struct View {
3068 events: Vec<usize>,
3069 }
3070
3071 impl Entity for View {
3072 type Event = usize;
3073 }
3074
3075 impl super::View for View {
3076 fn render<'a>(&self, _: &AppContext) -> ElementBox {
3077 Empty::new().boxed()
3078 }
3079
3080 fn ui_name() -> &'static str {
3081 "View"
3082 }
3083 }
3084
3085 struct Model;
3086
3087 impl Entity for Model {
3088 type Event = usize;
3089 }
3090
3091 App::test((), |app| {
3092 let (window_id, handle_1) = app.add_window(|_| View::default());
3093 let handle_2 = app.add_view(window_id, |_| View::default());
3094 let handle_2b = handle_2.clone();
3095 let handle_3 = app.add_model(|_| Model);
3096
3097 handle_1.update(app, |_, c| {
3098 c.subscribe_to_view(&handle_2, move |me, _, event, c| {
3099 me.events.push(*event);
3100
3101 c.subscribe_to_view(&handle_2b, |me, _, event, _| {
3102 me.events.push(*event * 2);
3103 });
3104 });
3105
3106 c.subscribe_to_model(&handle_3, |me, _, event, _| {
3107 me.events.push(*event);
3108 })
3109 });
3110
3111 handle_2.update(app, |_, c| c.emit(7));
3112 assert_eq!(handle_1.read(app).events, vec![7]);
3113
3114 handle_2.update(app, |_, c| c.emit(5));
3115 assert_eq!(handle_1.read(app).events, vec![7, 10, 5]);
3116
3117 handle_3.update(app, |_, c| c.emit(9));
3118 assert_eq!(handle_1.read(app).events, vec![7, 10, 5, 9]);
3119 })
3120 }
3121
3122 #[test]
3123 fn test_dropping_subscribers() {
3124 struct View;
3125
3126 impl Entity for View {
3127 type Event = ();
3128 }
3129
3130 impl super::View for View {
3131 fn render<'a>(&self, _: &AppContext) -> ElementBox {
3132 Empty::new().boxed()
3133 }
3134
3135 fn ui_name() -> &'static str {
3136 "View"
3137 }
3138 }
3139
3140 struct Model;
3141
3142 impl Entity for Model {
3143 type Event = ();
3144 }
3145
3146 App::test((), |app| {
3147 let (window_id, _) = app.add_window(|_| View);
3148 let observing_view = app.add_view(window_id, |_| View);
3149 let emitting_view = app.add_view(window_id, |_| View);
3150 let observing_model = app.add_model(|_| Model);
3151 let observed_model = app.add_model(|_| Model);
3152
3153 observing_view.update(app, |_, ctx| {
3154 ctx.subscribe_to_view(&emitting_view, |_, _, _, _| {});
3155 ctx.subscribe_to_model(&observed_model, |_, _, _, _| {});
3156 });
3157 observing_model.update(app, |_, ctx| {
3158 ctx.subscribe(&observed_model, |_, _, _| {});
3159 });
3160
3161 app.update(|| {
3162 drop(observing_view);
3163 drop(observing_model);
3164 });
3165
3166 emitting_view.update(app, |_, ctx| ctx.emit(()));
3167 observed_model.update(app, |_, ctx| ctx.emit(()));
3168 })
3169 }
3170
3171 #[test]
3172 fn test_observe_and_notify_from_view() {
3173 #[derive(Default)]
3174 struct View {
3175 events: Vec<usize>,
3176 }
3177
3178 impl Entity for View {
3179 type Event = usize;
3180 }
3181
3182 impl super::View for View {
3183 fn render<'a>(&self, _: &AppContext) -> ElementBox {
3184 Empty::new().boxed()
3185 }
3186
3187 fn ui_name() -> &'static str {
3188 "View"
3189 }
3190 }
3191
3192 #[derive(Default)]
3193 struct Model {
3194 count: usize,
3195 }
3196
3197 impl Entity for Model {
3198 type Event = ();
3199 }
3200
3201 App::test((), |app| {
3202 let (_, view) = app.add_window(|_| View::default());
3203 let model = app.add_model(|_| Model::default());
3204
3205 view.update(app, |_, c| {
3206 c.observe_model(&model, |me, observed, c| {
3207 me.events.push(observed.read(c).count)
3208 });
3209 });
3210
3211 model.update(app, |model, c| {
3212 model.count = 11;
3213 c.notify();
3214 });
3215 assert_eq!(view.read(app).events, vec![11]);
3216 })
3217 }
3218
3219 #[test]
3220 fn test_dropping_observers() {
3221 struct View;
3222
3223 impl Entity for View {
3224 type Event = ();
3225 }
3226
3227 impl super::View for View {
3228 fn render<'a>(&self, _: &AppContext) -> ElementBox {
3229 Empty::new().boxed()
3230 }
3231
3232 fn ui_name() -> &'static str {
3233 "View"
3234 }
3235 }
3236
3237 struct Model;
3238
3239 impl Entity for Model {
3240 type Event = ();
3241 }
3242
3243 App::test((), |app| {
3244 let (window_id, _) = app.add_window(|_| View);
3245 let observing_view = app.add_view(window_id, |_| View);
3246 let observing_model = app.add_model(|_| Model);
3247 let observed_model = app.add_model(|_| Model);
3248
3249 observing_view.update(app, |_, ctx| {
3250 ctx.observe_model(&observed_model, |_, _, _| {});
3251 });
3252 observing_model.update(app, |_, ctx| {
3253 ctx.observe(&observed_model, |_, _, _| {});
3254 });
3255
3256 app.update(|| {
3257 drop(observing_view);
3258 drop(observing_model);
3259 });
3260
3261 observed_model.update(app, |_, ctx| ctx.notify());
3262 })
3263 }
3264
3265 #[test]
3266 fn test_focus() {
3267 struct View {
3268 name: String,
3269 events: Arc<Mutex<Vec<String>>>,
3270 }
3271
3272 impl Entity for View {
3273 type Event = ();
3274 }
3275
3276 impl super::View for View {
3277 fn render<'a>(&self, _: &AppContext) -> ElementBox {
3278 Empty::new().boxed()
3279 }
3280
3281 fn ui_name() -> &'static str {
3282 "View"
3283 }
3284
3285 fn on_focus(&mut self, _: &mut ViewContext<Self>) {
3286 self.events.lock().push(format!("{} focused", &self.name));
3287 }
3288
3289 fn on_blur(&mut self, _: &mut ViewContext<Self>) {
3290 self.events.lock().push(format!("{} blurred", &self.name));
3291 }
3292 }
3293
3294 App::test((), |app| {
3295 let events: Arc<Mutex<Vec<String>>> = Default::default();
3296 let (window_id, view_1) = app.add_window(|_| View {
3297 events: events.clone(),
3298 name: "view 1".to_string(),
3299 });
3300 let view_2 = app.add_view(window_id, |_| View {
3301 events: events.clone(),
3302 name: "view 2".to_string(),
3303 });
3304
3305 view_1.update(app, |_, ctx| ctx.focus(&view_2));
3306 view_1.update(app, |_, ctx| ctx.focus(&view_1));
3307 view_1.update(app, |_, ctx| ctx.focus(&view_2));
3308 view_1.update(app, |_, _| drop(view_2));
3309
3310 assert_eq!(
3311 *events.lock(),
3312 [
3313 "view 1 focused".to_string(),
3314 "view 1 blurred".to_string(),
3315 "view 2 focused".to_string(),
3316 "view 2 blurred".to_string(),
3317 "view 1 focused".to_string(),
3318 "view 1 blurred".to_string(),
3319 "view 2 focused".to_string(),
3320 "view 1 focused".to_string(),
3321 ],
3322 );
3323 })
3324 }
3325
3326 #[test]
3327 fn test_spawn_from_view() {
3328 #[derive(Default)]
3329 struct View {
3330 count: usize,
3331 }
3332
3333 impl Entity for View {
3334 type Event = ();
3335 }
3336
3337 impl super::View for View {
3338 fn render<'a>(&self, _: &AppContext) -> ElementBox {
3339 Empty::new().boxed()
3340 }
3341
3342 fn ui_name() -> &'static str {
3343 "View"
3344 }
3345 }
3346
3347 App::test_async((), |mut app| async move {
3348 let handle = app.add_window(|_| View::default()).1;
3349 handle
3350 .update(&mut app, |_, c| {
3351 c.spawn(async { 7 }, |me, output, _| {
3352 me.count = output;
3353 })
3354 })
3355 .await;
3356 app.read(|ctx| assert_eq!(handle.read(ctx).count, 7));
3357 handle
3358 .update(&mut app, |_, c| {
3359 c.spawn(async { 14 }, |me, output, _| {
3360 me.count = output;
3361 })
3362 })
3363 .await;
3364 app.read(|ctx| assert_eq!(handle.read(ctx).count, 14));
3365 });
3366 }
3367
3368 #[test]
3369 fn test_spawn_stream_local_from_view() {
3370 #[derive(Default)]
3371 struct View {
3372 events: Vec<Option<usize>>,
3373 }
3374
3375 impl Entity for View {
3376 type Event = ();
3377 }
3378
3379 impl super::View for View {
3380 fn render<'a>(&self, _: &AppContext) -> ElementBox {
3381 Empty::new().boxed()
3382 }
3383
3384 fn ui_name() -> &'static str {
3385 "View"
3386 }
3387 }
3388
3389 App::test_async((), |mut app| async move {
3390 let (_, handle) = app.add_window(|_| View::default());
3391 handle
3392 .update(&mut app, |_, c| {
3393 c.spawn_stream(
3394 smol::stream::iter(vec![1_usize, 2, 3]),
3395 |me, output, _| {
3396 me.events.push(Some(output));
3397 },
3398 |me, _| {
3399 me.events.push(None);
3400 },
3401 )
3402 })
3403 .await;
3404
3405 app.read(|ctx| assert_eq!(handle.read(ctx).events, [Some(1), Some(2), Some(3), None]))
3406 });
3407 }
3408
3409 #[test]
3410 fn test_dispatch_action() {
3411 struct ViewA {
3412 id: usize,
3413 }
3414
3415 impl Entity for ViewA {
3416 type Event = ();
3417 }
3418
3419 impl View for ViewA {
3420 fn render<'a>(&self, _: &AppContext) -> ElementBox {
3421 Empty::new().boxed()
3422 }
3423
3424 fn ui_name() -> &'static str {
3425 "View"
3426 }
3427 }
3428
3429 struct ViewB {
3430 id: usize,
3431 }
3432
3433 impl Entity for ViewB {
3434 type Event = ();
3435 }
3436
3437 impl View for ViewB {
3438 fn render<'a>(&self, _: &AppContext) -> ElementBox {
3439 Empty::new().boxed()
3440 }
3441
3442 fn ui_name() -> &'static str {
3443 "View"
3444 }
3445 }
3446
3447 struct ActionArg {
3448 foo: String,
3449 }
3450
3451 App::test((), |app| {
3452 let actions = Rc::new(RefCell::new(Vec::new()));
3453
3454 let actions_clone = actions.clone();
3455 app.add_global_action("action", move |_: &ActionArg, _: &mut MutableAppContext| {
3456 actions_clone.borrow_mut().push("global a".to_string());
3457 });
3458
3459 let actions_clone = actions.clone();
3460 app.add_global_action("action", move |_: &ActionArg, _: &mut MutableAppContext| {
3461 actions_clone.borrow_mut().push("global b".to_string());
3462 });
3463
3464 let actions_clone = actions.clone();
3465 app.add_action("action", move |view: &mut ViewA, arg: &ActionArg, ctx| {
3466 assert_eq!(arg.foo, "bar");
3467 ctx.propagate_action();
3468 actions_clone.borrow_mut().push(format!("{} a", view.id));
3469 });
3470
3471 let actions_clone = actions.clone();
3472 app.add_action("action", move |view: &mut ViewA, _: &ActionArg, ctx| {
3473 if view.id != 1 {
3474 ctx.propagate_action();
3475 }
3476 actions_clone.borrow_mut().push(format!("{} b", view.id));
3477 });
3478
3479 let actions_clone = actions.clone();
3480 app.add_action("action", move |view: &mut ViewB, _: &ActionArg, ctx| {
3481 ctx.propagate_action();
3482 actions_clone.borrow_mut().push(format!("{} c", view.id));
3483 });
3484
3485 let actions_clone = actions.clone();
3486 app.add_action("action", move |view: &mut ViewB, _: &ActionArg, ctx| {
3487 ctx.propagate_action();
3488 actions_clone.borrow_mut().push(format!("{} d", view.id));
3489 });
3490
3491 let (window_id, view_1) = app.add_window(|_| ViewA { id: 1 });
3492 let view_2 = app.add_view(window_id, |_| ViewB { id: 2 });
3493 let view_3 = app.add_view(window_id, |_| ViewA { id: 3 });
3494 let view_4 = app.add_view(window_id, |_| ViewB { id: 4 });
3495
3496 app.dispatch_action(
3497 window_id,
3498 vec![view_1.id(), view_2.id(), view_3.id(), view_4.id()],
3499 "action",
3500 ActionArg { foo: "bar".into() },
3501 );
3502
3503 assert_eq!(
3504 *actions.borrow(),
3505 vec!["4 d", "4 c", "3 b", "3 a", "2 d", "2 c", "1 b"]
3506 );
3507
3508 // Remove view_1, which doesn't propagate the action
3509 actions.borrow_mut().clear();
3510 app.dispatch_action(
3511 window_id,
3512 vec![view_2.id(), view_3.id(), view_4.id()],
3513 "action",
3514 ActionArg { foo: "bar".into() },
3515 );
3516
3517 assert_eq!(
3518 *actions.borrow(),
3519 vec!["4 d", "4 c", "3 b", "3 a", "2 d", "2 c", "global b", "global a"]
3520 );
3521 })
3522 }
3523
3524 #[test]
3525 fn test_dispatch_keystroke() {
3526 use std::cell::Cell;
3527
3528 #[derive(Clone)]
3529 struct ActionArg {
3530 key: String,
3531 }
3532
3533 struct View {
3534 id: usize,
3535 keymap_context: keymap::Context,
3536 }
3537
3538 impl Entity for View {
3539 type Event = ();
3540 }
3541
3542 impl super::View for View {
3543 fn render<'a>(&self, _: &AppContext) -> ElementBox {
3544 Empty::new().boxed()
3545 }
3546
3547 fn ui_name() -> &'static str {
3548 "View"
3549 }
3550
3551 fn keymap_context(&self, _: &AppContext) -> keymap::Context {
3552 self.keymap_context.clone()
3553 }
3554 }
3555
3556 impl View {
3557 fn new(id: usize) -> Self {
3558 View {
3559 id,
3560 keymap_context: keymap::Context::default(),
3561 }
3562 }
3563 }
3564
3565 App::test((), |app| {
3566 let mut view_1 = View::new(1);
3567 let mut view_2 = View::new(2);
3568 let mut view_3 = View::new(3);
3569 view_1.keymap_context.set.insert("a".into());
3570 view_2.keymap_context.set.insert("b".into());
3571 view_3.keymap_context.set.insert("c".into());
3572
3573 let (window_id, view_1) = app.add_window(|_| view_1);
3574 let view_2 = app.add_view(window_id, |_| view_2);
3575 let view_3 = app.add_view(window_id, |_| view_3);
3576
3577 // This keymap's only binding dispatches an action on view 2 because that view will have
3578 // "a" and "b" in its context, but not "c".
3579 let binding = keymap::Binding::new("a", "action", Some("a && b && !c"))
3580 .with_arg(ActionArg { key: "a".into() });
3581 app.add_bindings(vec![binding]);
3582
3583 let handled_action = Rc::new(Cell::new(false));
3584 let handled_action_clone = handled_action.clone();
3585 app.add_action("action", move |view: &mut View, arg: &ActionArg, _ctx| {
3586 handled_action_clone.set(true);
3587 assert_eq!(view.id, 2);
3588 assert_eq!(arg.key, "a");
3589 });
3590
3591 app.dispatch_keystroke(
3592 window_id,
3593 vec![view_1.id(), view_2.id(), view_3.id()],
3594 &Keystroke::parse("a").unwrap(),
3595 )
3596 .unwrap();
3597
3598 assert!(handled_action.get());
3599 });
3600 }
3601
3602 #[test]
3603 fn test_model_condition() {
3604 struct Counter(usize);
3605
3606 impl super::Entity for Counter {
3607 type Event = ();
3608 }
3609
3610 impl Counter {
3611 fn inc(&mut self, ctx: &mut ModelContext<Self>) {
3612 self.0 += 1;
3613 ctx.notify();
3614 }
3615 }
3616
3617 App::test_async((), |mut app| async move {
3618 let model = app.add_model(|_| Counter(0));
3619
3620 let condition1 = model.condition(&app, |model, _| model.0 == 2);
3621 let condition2 = model.condition(&app, |model, _| model.0 == 3);
3622 smol::pin!(condition1, condition2);
3623
3624 model.update(&mut app, |model, ctx| model.inc(ctx));
3625 assert_eq!(poll_once(&mut condition1).await, None);
3626 assert_eq!(poll_once(&mut condition2).await, None);
3627
3628 model.update(&mut app, |model, ctx| model.inc(ctx));
3629 assert_eq!(poll_once(&mut condition1).await, Some(()));
3630 assert_eq!(poll_once(&mut condition2).await, None);
3631
3632 model.update(&mut app, |model, ctx| model.inc(ctx));
3633 assert_eq!(poll_once(&mut condition2).await, Some(()));
3634
3635 model.update(&mut app, |_, ctx| ctx.notify());
3636 });
3637 }
3638
3639 #[test]
3640 #[should_panic]
3641 fn test_model_condition_timeout() {
3642 struct Model;
3643
3644 impl super::Entity for Model {
3645 type Event = ();
3646 }
3647
3648 App::test_async((), |mut app| async move {
3649 let model = app.add_model(|_| Model);
3650 model.condition(&app, |_, _| false).await;
3651 });
3652 }
3653
3654 #[test]
3655 #[should_panic(expected = "model dropped with pending condition")]
3656 fn test_model_condition_panic_on_drop() {
3657 struct Model;
3658
3659 impl super::Entity for Model {
3660 type Event = ();
3661 }
3662
3663 App::test_async((), |mut app| async move {
3664 let model = app.add_model(|_| Model);
3665 let condition = model.condition(&app, |_, _| false);
3666 app.update(|_| drop(model));
3667 condition.await;
3668 });
3669 }
3670
3671 #[test]
3672 fn test_view_condition() {
3673 struct Counter(usize);
3674
3675 impl super::Entity for Counter {
3676 type Event = ();
3677 }
3678
3679 impl super::View for Counter {
3680 fn ui_name() -> &'static str {
3681 "test view"
3682 }
3683
3684 fn render(&self, _: &AppContext) -> ElementBox {
3685 Empty::new().boxed()
3686 }
3687 }
3688
3689 impl Counter {
3690 fn inc(&mut self, ctx: &mut ViewContext<Self>) {
3691 self.0 += 1;
3692 ctx.notify();
3693 }
3694 }
3695
3696 App::test_async((), |mut app| async move {
3697 let (_, view) = app.add_window(|_| Counter(0));
3698
3699 let condition1 = view.condition(&app, |view, _| view.0 == 2);
3700 let condition2 = view.condition(&app, |view, _| view.0 == 3);
3701 smol::pin!(condition1, condition2);
3702
3703 view.update(&mut app, |view, ctx| view.inc(ctx));
3704 assert_eq!(poll_once(&mut condition1).await, None);
3705 assert_eq!(poll_once(&mut condition2).await, None);
3706
3707 view.update(&mut app, |view, ctx| view.inc(ctx));
3708 assert_eq!(poll_once(&mut condition1).await, Some(()));
3709 assert_eq!(poll_once(&mut condition2).await, None);
3710
3711 view.update(&mut app, |view, ctx| view.inc(ctx));
3712 assert_eq!(poll_once(&mut condition2).await, Some(()));
3713 view.update(&mut app, |_, ctx| ctx.notify());
3714 });
3715 }
3716
3717 #[test]
3718 #[should_panic]
3719 fn test_view_condition_timeout() {
3720 struct View;
3721
3722 impl super::Entity for View {
3723 type Event = ();
3724 }
3725
3726 impl super::View for View {
3727 fn ui_name() -> &'static str {
3728 "test view"
3729 }
3730
3731 fn render(&self, _: &AppContext) -> ElementBox {
3732 Empty::new().boxed()
3733 }
3734 }
3735
3736 App::test_async((), |mut app| async move {
3737 let (_, view) = app.add_window(|_| View);
3738 view.condition(&app, |_, _| false).await;
3739 });
3740 }
3741
3742 #[test]
3743 #[should_panic(expected = "view dropped with pending condition")]
3744 fn test_view_condition_panic_on_drop() {
3745 struct View;
3746
3747 impl super::Entity for View {
3748 type Event = ();
3749 }
3750
3751 impl super::View for View {
3752 fn ui_name() -> &'static str {
3753 "test view"
3754 }
3755
3756 fn render(&self, _: &AppContext) -> ElementBox {
3757 Empty::new().boxed()
3758 }
3759 }
3760
3761 App::test_async((), |mut app| async move {
3762 let window_id = app.add_window(|_| View).0;
3763 let view = app.add_view(window_id, |_| View);
3764
3765 let condition = view.condition(&app, |_, _| false);
3766 app.update(|_| drop(view));
3767 condition.await;
3768 });
3769 }
3770
3771 // #[test]
3772 // fn test_ui_and_window_updates() {
3773 // struct View {
3774 // count: usize,
3775 // }
3776
3777 // impl Entity for View {
3778 // type Event = ();
3779 // }
3780
3781 // impl super::View for View {
3782 // fn render<'a>(&self, _: &AppContext) -> ElementBox {
3783 // Empty::new().boxed()
3784 // }
3785
3786 // fn ui_name() -> &'static str {
3787 // "View"
3788 // }
3789 // }
3790
3791 // App::test(|app| async move {
3792 // let (window_id, _) = app.add_window(|_| View { count: 3 });
3793 // let view_1 = app.add_view(window_id, |_| View { count: 1 });
3794 // let view_2 = app.add_view(window_id, |_| View { count: 2 });
3795
3796 // // Ensure that registering for UI updates after mutating the app still gives us all the
3797 // // updates.
3798 // let ui_updates = Rc::new(RefCell::new(Vec::new()));
3799 // let ui_updates_ = ui_updates.clone();
3800 // app.on_ui_update(move |update, _| ui_updates_.borrow_mut().push(update));
3801
3802 // assert_eq!(
3803 // ui_updates.borrow_mut().drain(..).collect::<Vec<_>>(),
3804 // vec![UiUpdate::OpenWindow {
3805 // window_id,
3806 // width: 1024.0,
3807 // height: 768.0,
3808 // }]
3809 // );
3810
3811 // let window_invalidations = Rc::new(RefCell::new(Vec::new()));
3812 // let window_invalidations_ = window_invalidations.clone();
3813 // app.on_window_invalidated(window_id, move |update, _| {
3814 // window_invalidations_.borrow_mut().push(update)
3815 // });
3816
3817 // let view_2_id = view_2.id();
3818 // view_1.update(app, |view, ctx| {
3819 // view.count = 7;
3820 // ctx.notify();
3821 // drop(view_2);
3822 // });
3823
3824 // let invalidation = window_invalidations.borrow_mut().drain(..).next().unwrap();
3825 // assert_eq!(invalidation.updated.len(), 1);
3826 // assert!(invalidation.updated.contains(&view_1.id()));
3827 // assert_eq!(invalidation.removed, vec![view_2_id]);
3828
3829 // let view_3 = view_1.update(app, |_, ctx| ctx.add_view(|_| View { count: 8 }));
3830
3831 // let invalidation = window_invalidations.borrow_mut().drain(..).next().unwrap();
3832 // assert_eq!(invalidation.updated.len(), 1);
3833 // assert!(invalidation.updated.contains(&view_3.id()));
3834 // assert!(invalidation.removed.is_empty());
3835
3836 // view_3
3837 // .update(app, |_, ctx| {
3838 // ctx.spawn_local(async { 9 }, |me, output, ctx| {
3839 // me.count = output;
3840 // ctx.notify();
3841 // })
3842 // })
3843 // .await;
3844
3845 // let invalidation = window_invalidations.borrow_mut().drain(..).next().unwrap();
3846 // assert_eq!(invalidation.updated.len(), 1);
3847 // assert!(invalidation.updated.contains(&view_3.id()));
3848 // assert!(invalidation.removed.is_empty());
3849 // });
3850 // }
3851}