1use crate::{
2 elements::ElementBox,
3 executor,
4 keymap::{self, Keystroke},
5 platform::{self, PromptLevel, 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<F>(
582 &self,
583 window_id: usize,
584 level: PromptLevel,
585 msg: &str,
586 answers: &[&str],
587 done_fn: F,
588 ) where
589 F: 'static + FnOnce(usize, &mut MutableAppContext),
590 {
591 let app = self.weak_self.as_ref().unwrap().upgrade().unwrap();
592 let foreground = self.foreground.clone();
593 let (_, window) = &self.presenters_and_platform_windows[&window_id];
594 window.prompt(
595 level,
596 msg,
597 answers,
598 Box::new(move |answer| {
599 foreground
600 .spawn(async move { (done_fn)(answer, &mut *app.borrow_mut()) })
601 .detach();
602 }),
603 );
604 }
605
606 pub fn prompt_for_paths<F>(&self, options: PathPromptOptions, done_fn: F)
607 where
608 F: 'static + FnOnce(Option<Vec<PathBuf>>, &mut MutableAppContext),
609 {
610 let app = self.weak_self.as_ref().unwrap().upgrade().unwrap();
611 let foreground = self.foreground.clone();
612 self.platform().prompt_for_paths(
613 options,
614 Box::new(move |paths| {
615 foreground
616 .spawn(async move { (done_fn)(paths, &mut *app.borrow_mut()) })
617 .detach();
618 }),
619 );
620 }
621
622 pub fn prompt_for_new_path<F>(&self, directory: &Path, done_fn: F)
623 where
624 F: 'static + FnOnce(Option<PathBuf>, &mut MutableAppContext),
625 {
626 let app = self.weak_self.as_ref().unwrap().upgrade().unwrap();
627 let foreground = self.foreground.clone();
628 self.platform().prompt_for_new_path(
629 directory,
630 Box::new(move |path| {
631 foreground
632 .spawn(async move { (done_fn)(path, &mut *app.borrow_mut()) })
633 .detach();
634 }),
635 );
636 }
637
638 pub(crate) fn notify_view(&mut self, window_id: usize, view_id: usize) {
639 self.pending_effects
640 .push_back(Effect::ViewNotification { window_id, view_id });
641 }
642
643 pub fn dispatch_action<T: 'static + Any>(
644 &mut self,
645 window_id: usize,
646 responder_chain: Vec<usize>,
647 name: &str,
648 arg: T,
649 ) {
650 self.dispatch_action_any(window_id, &responder_chain, name, Box::new(arg).as_ref());
651 }
652
653 pub(crate) fn dispatch_action_any(
654 &mut self,
655 window_id: usize,
656 path: &[usize],
657 name: &str,
658 arg: &dyn Any,
659 ) -> bool {
660 self.pending_flushes += 1;
661 let mut halted_dispatch = false;
662
663 for view_id in path.iter().rev() {
664 if let Some(mut view) = self.ctx.views.remove(&(window_id, *view_id)) {
665 let type_id = view.as_any().type_id();
666
667 if let Some((name, mut handlers)) = self
668 .actions
669 .get_mut(&type_id)
670 .and_then(|h| h.remove_entry(name))
671 {
672 for handler in handlers.iter_mut().rev() {
673 let halt_dispatch = handler(view.as_mut(), arg, self, window_id, *view_id);
674 if halt_dispatch {
675 halted_dispatch = true;
676 break;
677 }
678 }
679 self.actions
680 .get_mut(&type_id)
681 .unwrap()
682 .insert(name, handlers);
683 }
684
685 self.ctx.views.insert((window_id, *view_id), view);
686
687 if halted_dispatch {
688 break;
689 }
690 }
691 }
692
693 if !halted_dispatch {
694 self.dispatch_global_action_any(name, arg);
695 }
696
697 self.flush_effects();
698 halted_dispatch
699 }
700
701 pub fn dispatch_global_action<T: 'static + Any>(&mut self, name: &str, arg: T) {
702 self.dispatch_global_action_any(name, Box::new(arg).as_ref());
703 }
704
705 fn dispatch_global_action_any(&mut self, name: &str, arg: &dyn Any) {
706 if let Some((name, mut handlers)) = self.global_actions.remove_entry(name) {
707 self.pending_flushes += 1;
708 for handler in handlers.iter_mut().rev() {
709 handler(arg, self);
710 }
711 self.global_actions.insert(name, handlers);
712 self.flush_effects();
713 }
714 }
715
716 pub fn add_bindings<T: IntoIterator<Item = keymap::Binding>>(&mut self, bindings: T) {
717 self.keystroke_matcher.add_bindings(bindings);
718 }
719
720 pub fn dispatch_keystroke(
721 &mut self,
722 window_id: usize,
723 responder_chain: Vec<usize>,
724 keystroke: &Keystroke,
725 ) -> Result<bool> {
726 let mut context_chain = Vec::new();
727 let mut context = keymap::Context::default();
728 for view_id in &responder_chain {
729 if let Some(view) = self.ctx.views.get(&(window_id, *view_id)) {
730 context.extend(view.keymap_context(self.as_ref()));
731 context_chain.push(context.clone());
732 } else {
733 return Err(anyhow!(
734 "View {} in responder chain does not exist",
735 view_id
736 ));
737 }
738 }
739
740 let mut pending = false;
741 for (i, ctx) in context_chain.iter().enumerate().rev() {
742 match self
743 .keystroke_matcher
744 .push_keystroke(keystroke.clone(), responder_chain[i], ctx)
745 {
746 MatchResult::None => {}
747 MatchResult::Pending => pending = true,
748 MatchResult::Action { name, arg } => {
749 if self.dispatch_action_any(
750 window_id,
751 &responder_chain[0..=i],
752 &name,
753 arg.as_ref().map(|arg| arg.as_ref()).unwrap_or(&()),
754 ) {
755 return Ok(true);
756 }
757 }
758 }
759 }
760
761 Ok(pending)
762 }
763
764 pub fn add_model<T, F>(&mut self, build_model: F) -> ModelHandle<T>
765 where
766 T: Entity,
767 F: FnOnce(&mut ModelContext<T>) -> T,
768 {
769 self.pending_flushes += 1;
770 let model_id = post_inc(&mut self.next_entity_id);
771 let handle = ModelHandle::new(model_id, &self.ctx.ref_counts);
772 let mut ctx = ModelContext::new(self, model_id);
773 let model = build_model(&mut ctx);
774 self.ctx.models.insert(model_id, Box::new(model));
775 self.flush_effects();
776 handle
777 }
778
779 pub fn add_window<T, F>(&mut self, build_root_view: F) -> (usize, ViewHandle<T>)
780 where
781 T: View,
782 F: FnOnce(&mut ViewContext<T>) -> T,
783 {
784 self.pending_flushes += 1;
785 let window_id = post_inc(&mut self.next_window_id);
786 let root_view = self.add_view(window_id, build_root_view);
787
788 self.ctx.windows.insert(
789 window_id,
790 Window {
791 root_view: root_view.clone().into(),
792 focused_view_id: root_view.id(),
793 invalidation: None,
794 },
795 );
796 self.open_platform_window(window_id);
797 root_view.update(self, |view, ctx| view.on_focus(ctx));
798 self.flush_effects();
799
800 (window_id, root_view)
801 }
802
803 pub fn remove_window(&mut self, window_id: usize) {
804 self.ctx.windows.remove(&window_id);
805 self.presenters_and_platform_windows.remove(&window_id);
806 self.remove_dropped_entities();
807 }
808
809 fn open_platform_window(&mut self, window_id: usize) {
810 let mut window = self.platform.open_window(
811 window_id,
812 WindowOptions {
813 bounds: RectF::new(vec2f(0., 0.), vec2f(1024., 768.)),
814 title: "Zed".into(),
815 },
816 self.foreground.clone(),
817 );
818 let text_layout_cache = TextLayoutCache::new(self.platform.fonts());
819 let presenter = Rc::new(RefCell::new(Presenter::new(
820 window_id,
821 self.ctx.font_cache.clone(),
822 text_layout_cache,
823 self.assets.clone(),
824 self,
825 )));
826
827 {
828 let mut app = self.upgrade();
829 let presenter = presenter.clone();
830 window.on_event(Box::new(move |event| {
831 app.update(|ctx| {
832 if let Event::KeyDown { keystroke, .. } = &event {
833 if ctx
834 .dispatch_keystroke(
835 window_id,
836 presenter.borrow().dispatch_path(ctx.as_ref()),
837 keystroke,
838 )
839 .unwrap()
840 {
841 return;
842 }
843 }
844
845 presenter.borrow_mut().dispatch_event(event, ctx);
846 })
847 }));
848 }
849
850 {
851 let mut app = self.upgrade();
852 let presenter = presenter.clone();
853 window.on_resize(Box::new(move |window| {
854 app.update(|ctx| {
855 let scene = presenter.borrow_mut().build_scene(
856 window.size(),
857 window.scale_factor(),
858 ctx,
859 );
860 window.present_scene(scene);
861 })
862 }));
863 }
864
865 {
866 let mut app = self.upgrade();
867 window.on_close(Box::new(move || {
868 app.update(|ctx| ctx.remove_window(window_id));
869 }));
870 }
871
872 self.presenters_and_platform_windows
873 .insert(window_id, (presenter.clone(), window));
874
875 self.on_debug_elements(window_id, move |ctx| {
876 presenter.borrow().debug_elements(ctx).unwrap()
877 });
878 }
879
880 pub fn add_view<T, F>(&mut self, window_id: usize, build_view: F) -> ViewHandle<T>
881 where
882 T: View,
883 F: FnOnce(&mut ViewContext<T>) -> T,
884 {
885 self.add_option_view(window_id, |ctx| Some(build_view(ctx)))
886 .unwrap()
887 }
888
889 pub fn add_option_view<T, F>(
890 &mut self,
891 window_id: usize,
892 build_view: F,
893 ) -> Option<ViewHandle<T>>
894 where
895 T: View,
896 F: FnOnce(&mut ViewContext<T>) -> Option<T>,
897 {
898 let view_id = post_inc(&mut self.next_entity_id);
899 self.pending_flushes += 1;
900 let handle = ViewHandle::new(window_id, view_id, &self.ctx.ref_counts);
901 let mut ctx = ViewContext::new(self, window_id, view_id);
902 let handle = if let Some(view) = build_view(&mut ctx) {
903 self.ctx.views.insert((window_id, view_id), Box::new(view));
904 if let Some(window) = self.ctx.windows.get_mut(&window_id) {
905 window
906 .invalidation
907 .get_or_insert_with(Default::default)
908 .updated
909 .insert(view_id);
910 }
911 Some(handle)
912 } else {
913 None
914 };
915 self.flush_effects();
916 handle
917 }
918
919 fn remove_dropped_entities(&mut self) {
920 loop {
921 let (dropped_models, dropped_views, dropped_values) =
922 self.ctx.ref_counts.lock().take_dropped();
923 if dropped_models.is_empty() && dropped_views.is_empty() && dropped_values.is_empty() {
924 break;
925 }
926
927 for model_id in dropped_models {
928 self.ctx.models.remove(&model_id);
929 self.subscriptions.remove(&model_id);
930 self.model_observations.remove(&model_id);
931 }
932
933 for (window_id, view_id) in dropped_views {
934 self.subscriptions.remove(&view_id);
935 self.model_observations.remove(&view_id);
936 self.ctx.views.remove(&(window_id, view_id));
937 let change_focus_to = self.ctx.windows.get_mut(&window_id).and_then(|window| {
938 window
939 .invalidation
940 .get_or_insert_with(Default::default)
941 .removed
942 .push(view_id);
943 if window.focused_view_id == view_id {
944 Some(window.root_view.id())
945 } else {
946 None
947 }
948 });
949
950 if let Some(view_id) = change_focus_to {
951 self.focus(window_id, view_id);
952 }
953 }
954
955 let mut values = self.ctx.values.write();
956 for key in dropped_values {
957 values.remove(&key);
958 }
959 }
960 }
961
962 fn flush_effects(&mut self) {
963 self.pending_flushes = self.pending_flushes.saturating_sub(1);
964
965 if !self.flushing_effects && self.pending_flushes == 0 {
966 self.flushing_effects = true;
967
968 loop {
969 if let Some(effect) = self.pending_effects.pop_front() {
970 match effect {
971 Effect::Event { entity_id, payload } => self.emit_event(entity_id, payload),
972 Effect::ModelNotification { model_id } => {
973 self.notify_model_observers(model_id)
974 }
975 Effect::ViewNotification { window_id, view_id } => {
976 self.notify_view_observers(window_id, view_id)
977 }
978 Effect::Focus { window_id, view_id } => {
979 self.focus(window_id, view_id);
980 }
981 }
982 } else {
983 self.remove_dropped_entities();
984 self.update_windows();
985
986 if self.pending_effects.is_empty() {
987 self.flushing_effects = false;
988 break;
989 }
990 }
991 }
992 }
993 }
994
995 fn update_windows(&mut self) {
996 let mut invalidations = HashMap::new();
997 for (window_id, window) in &mut self.ctx.windows {
998 if let Some(invalidation) = window.invalidation.take() {
999 invalidations.insert(*window_id, invalidation);
1000 }
1001 }
1002
1003 for (window_id, invalidation) in invalidations {
1004 if let Some((presenter, mut window)) =
1005 self.presenters_and_platform_windows.remove(&window_id)
1006 {
1007 {
1008 let mut presenter = presenter.borrow_mut();
1009 presenter.invalidate(invalidation, self.as_ref());
1010 let scene = presenter.build_scene(window.size(), window.scale_factor(), self);
1011 window.present_scene(scene);
1012 }
1013 self.presenters_and_platform_windows
1014 .insert(window_id, (presenter, window));
1015 }
1016 }
1017 }
1018
1019 fn emit_event(&mut self, entity_id: usize, payload: Box<dyn Any>) {
1020 if let Some(subscriptions) = self.subscriptions.remove(&entity_id) {
1021 for mut subscription in subscriptions {
1022 let alive = match &mut subscription {
1023 Subscription::FromModel { model_id, callback } => {
1024 if let Some(mut model) = self.ctx.models.remove(model_id) {
1025 callback(model.as_any_mut(), payload.as_ref(), self, *model_id);
1026 self.ctx.models.insert(*model_id, model);
1027 true
1028 } else {
1029 false
1030 }
1031 }
1032 Subscription::FromView {
1033 window_id,
1034 view_id,
1035 callback,
1036 } => {
1037 if let Some(mut view) = self.ctx.views.remove(&(*window_id, *view_id)) {
1038 callback(
1039 view.as_any_mut(),
1040 payload.as_ref(),
1041 self,
1042 *window_id,
1043 *view_id,
1044 );
1045 self.ctx.views.insert((*window_id, *view_id), view);
1046 true
1047 } else {
1048 false
1049 }
1050 }
1051 };
1052
1053 if alive {
1054 self.subscriptions
1055 .entry(entity_id)
1056 .or_default()
1057 .push(subscription);
1058 }
1059 }
1060 }
1061 }
1062
1063 fn notify_model_observers(&mut self, observed_id: usize) {
1064 if let Some(observations) = self.model_observations.remove(&observed_id) {
1065 if self.ctx.models.contains_key(&observed_id) {
1066 for mut observation in observations {
1067 let alive = match &mut observation {
1068 ModelObservation::FromModel { model_id, callback } => {
1069 if let Some(mut model) = self.ctx.models.remove(model_id) {
1070 callback(model.as_any_mut(), observed_id, self, *model_id);
1071 self.ctx.models.insert(*model_id, model);
1072 true
1073 } else {
1074 false
1075 }
1076 }
1077 ModelObservation::FromView {
1078 window_id,
1079 view_id,
1080 callback,
1081 } => {
1082 if let Some(mut view) = self.ctx.views.remove(&(*window_id, *view_id)) {
1083 callback(
1084 view.as_any_mut(),
1085 observed_id,
1086 self,
1087 *window_id,
1088 *view_id,
1089 );
1090 self.ctx.views.insert((*window_id, *view_id), view);
1091 true
1092 } else {
1093 false
1094 }
1095 }
1096 };
1097
1098 if alive {
1099 self.model_observations
1100 .entry(observed_id)
1101 .or_default()
1102 .push(observation);
1103 }
1104 }
1105 }
1106 }
1107 }
1108
1109 fn notify_view_observers(&mut self, window_id: usize, view_id: usize) {
1110 if let Some(window) = self.ctx.windows.get_mut(&window_id) {
1111 window
1112 .invalidation
1113 .get_or_insert_with(Default::default)
1114 .updated
1115 .insert(view_id);
1116 }
1117
1118 if let Some(observations) = self.view_observations.remove(&view_id) {
1119 if self.ctx.views.contains_key(&(window_id, view_id)) {
1120 for mut observation in observations {
1121 let alive = if let Some(mut view) = self
1122 .ctx
1123 .views
1124 .remove(&(observation.window_id, observation.view_id))
1125 {
1126 (observation.callback)(
1127 view.as_any_mut(),
1128 view_id,
1129 window_id,
1130 self,
1131 observation.window_id,
1132 observation.view_id,
1133 );
1134 self.ctx
1135 .views
1136 .insert((observation.window_id, observation.view_id), view);
1137 true
1138 } else {
1139 false
1140 };
1141
1142 if alive {
1143 self.view_observations
1144 .entry(view_id)
1145 .or_default()
1146 .push(observation);
1147 }
1148 }
1149 }
1150 }
1151 }
1152
1153 fn focus(&mut self, window_id: usize, focused_id: usize) {
1154 if self
1155 .ctx
1156 .windows
1157 .get(&window_id)
1158 .map(|w| w.focused_view_id)
1159 .map_or(false, |cur_focused| cur_focused == focused_id)
1160 {
1161 return;
1162 }
1163
1164 self.pending_flushes += 1;
1165
1166 let blurred_id = self.ctx.windows.get_mut(&window_id).map(|window| {
1167 let blurred_id = window.focused_view_id;
1168 window.focused_view_id = focused_id;
1169 blurred_id
1170 });
1171
1172 if let Some(blurred_id) = blurred_id {
1173 if let Some(mut blurred_view) = self.ctx.views.remove(&(window_id, blurred_id)) {
1174 blurred_view.on_blur(self, window_id, blurred_id);
1175 self.ctx.views.insert((window_id, blurred_id), blurred_view);
1176 }
1177 }
1178
1179 if let Some(mut focused_view) = self.ctx.views.remove(&(window_id, focused_id)) {
1180 focused_view.on_focus(self, window_id, focused_id);
1181 self.ctx.views.insert((window_id, focused_id), focused_view);
1182 }
1183
1184 self.flush_effects();
1185 }
1186
1187 fn spawn<F, T>(&mut self, spawner: Spawner, future: F) -> EntityTask<T>
1188 where
1189 F: 'static + Future,
1190 T: 'static,
1191 {
1192 let task_id = post_inc(&mut self.next_task_id);
1193 let app = self.weak_self.as_ref().unwrap().upgrade().unwrap();
1194 let task = {
1195 let app = app.clone();
1196 self.foreground.spawn(async move {
1197 let output = future.await;
1198 app.borrow_mut()
1199 .handle_future_output(task_id, Box::new(output))
1200 .map(|output| *output.downcast::<T>().unwrap())
1201 })
1202 };
1203 EntityTask::new(
1204 task_id,
1205 task,
1206 spawner,
1207 TaskHandlerMap::Future(self.future_handlers.clone()),
1208 )
1209 }
1210
1211 fn spawn_stream<F, T>(&mut self, spawner: Spawner, mut stream: F) -> EntityTask<T>
1212 where
1213 F: 'static + Stream + Unpin,
1214 T: 'static,
1215 {
1216 let task_id = post_inc(&mut self.next_task_id);
1217 let app = self.weak_self.as_ref().unwrap().upgrade().unwrap();
1218 let task = self.foreground.spawn(async move {
1219 loop {
1220 match stream.next().await {
1221 Some(item) => {
1222 let mut app = app.borrow_mut();
1223 if app.handle_stream_item(task_id, Box::new(item)) {
1224 break;
1225 }
1226 }
1227 None => {
1228 break;
1229 }
1230 }
1231 }
1232
1233 app.borrow_mut()
1234 .stream_completed(task_id)
1235 .map(|output| *output.downcast::<T>().unwrap())
1236 });
1237
1238 EntityTask::new(
1239 task_id,
1240 task,
1241 spawner,
1242 TaskHandlerMap::Stream(self.stream_handlers.clone()),
1243 )
1244 }
1245
1246 fn handle_future_output(
1247 &mut self,
1248 task_id: usize,
1249 output: Box<dyn Any>,
1250 ) -> Option<Box<dyn Any>> {
1251 self.pending_flushes += 1;
1252 let future_callback = self.future_handlers.borrow_mut().remove(&task_id).unwrap();
1253 let result = future_callback(output, self);
1254 self.flush_effects();
1255 result
1256 }
1257
1258 fn handle_stream_item(&mut self, task_id: usize, output: Box<dyn Any>) -> bool {
1259 self.pending_flushes += 1;
1260
1261 let mut handler = self.stream_handlers.borrow_mut().remove(&task_id).unwrap();
1262 let halt = (handler.item_callback)(output, self);
1263 self.stream_handlers.borrow_mut().insert(task_id, handler);
1264
1265 self.flush_effects();
1266 halt
1267 }
1268
1269 fn stream_completed(&mut self, task_id: usize) -> Option<Box<dyn Any>> {
1270 self.pending_flushes += 1;
1271
1272 let handler = self.stream_handlers.borrow_mut().remove(&task_id).unwrap();
1273 let result = (handler.done_callback)(self);
1274
1275 self.flush_effects();
1276 result
1277 }
1278
1279 pub fn write_to_clipboard(&self, item: ClipboardItem) {
1280 self.platform.write_to_clipboard(item);
1281 }
1282
1283 pub fn read_from_clipboard(&self) -> Option<ClipboardItem> {
1284 self.platform.read_from_clipboard()
1285 }
1286}
1287
1288impl ReadModel for MutableAppContext {
1289 fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T {
1290 if let Some(model) = self.ctx.models.get(&handle.model_id) {
1291 model
1292 .as_any()
1293 .downcast_ref()
1294 .expect("downcast is type safe")
1295 } else {
1296 panic!("circular model reference");
1297 }
1298 }
1299}
1300
1301impl UpdateModel for MutableAppContext {
1302 fn update_model<T, F, S>(&mut self, handle: &ModelHandle<T>, update: F) -> S
1303 where
1304 T: Entity,
1305 F: FnOnce(&mut T, &mut ModelContext<T>) -> S,
1306 {
1307 if let Some(mut model) = self.ctx.models.remove(&handle.model_id) {
1308 self.pending_flushes += 1;
1309 let mut ctx = ModelContext::new(self, handle.model_id);
1310 let result = update(
1311 model
1312 .as_any_mut()
1313 .downcast_mut()
1314 .expect("downcast is type safe"),
1315 &mut ctx,
1316 );
1317 self.ctx.models.insert(handle.model_id, model);
1318 self.flush_effects();
1319 result
1320 } else {
1321 panic!("circular model update");
1322 }
1323 }
1324}
1325
1326impl ReadView for MutableAppContext {
1327 fn read_view<T: View>(&self, handle: &ViewHandle<T>) -> &T {
1328 if let Some(view) = self.ctx.views.get(&(handle.window_id, handle.view_id)) {
1329 view.as_any().downcast_ref().expect("downcast is type safe")
1330 } else {
1331 panic!("circular view reference");
1332 }
1333 }
1334}
1335
1336impl UpdateView for MutableAppContext {
1337 fn update_view<T, F, S>(&mut self, handle: &ViewHandle<T>, update: F) -> S
1338 where
1339 T: View,
1340 F: FnOnce(&mut T, &mut ViewContext<T>) -> S,
1341 {
1342 self.pending_flushes += 1;
1343 let mut view = self
1344 .ctx
1345 .views
1346 .remove(&(handle.window_id, handle.view_id))
1347 .expect("circular view update");
1348
1349 let mut ctx = ViewContext::new(self, handle.window_id, handle.view_id);
1350 let result = update(
1351 view.as_any_mut()
1352 .downcast_mut()
1353 .expect("downcast is type safe"),
1354 &mut ctx,
1355 );
1356 self.ctx
1357 .views
1358 .insert((handle.window_id, handle.view_id), view);
1359 self.flush_effects();
1360 result
1361 }
1362}
1363
1364impl AsRef<AppContext> for MutableAppContext {
1365 fn as_ref(&self) -> &AppContext {
1366 &self.ctx
1367 }
1368}
1369
1370pub struct AppContext {
1371 models: HashMap<usize, Box<dyn AnyModel>>,
1372 views: HashMap<(usize, usize), Box<dyn AnyView>>,
1373 windows: HashMap<usize, Window>,
1374 values: RwLock<HashMap<(TypeId, usize), Box<dyn Any>>>,
1375 background: Arc<executor::Background>,
1376 ref_counts: Arc<Mutex<RefCounts>>,
1377 thread_pool: scoped_pool::Pool,
1378 font_cache: Arc<FontCache>,
1379}
1380
1381impl AppContext {
1382 pub fn root_view_id(&self, window_id: usize) -> Option<usize> {
1383 self.windows
1384 .get(&window_id)
1385 .map(|window| window.root_view.id())
1386 }
1387
1388 pub fn focused_view_id(&self, window_id: usize) -> Option<usize> {
1389 self.windows
1390 .get(&window_id)
1391 .map(|window| window.focused_view_id)
1392 }
1393
1394 pub fn render_view(&self, window_id: usize, view_id: usize) -> Result<ElementBox> {
1395 self.views
1396 .get(&(window_id, view_id))
1397 .map(|v| v.render(self))
1398 .ok_or(anyhow!("view not found"))
1399 }
1400
1401 pub fn render_views(&self, window_id: usize) -> HashMap<usize, ElementBox> {
1402 self.views
1403 .iter()
1404 .filter_map(|((win_id, view_id), view)| {
1405 if *win_id == window_id {
1406 Some((*view_id, view.render(self)))
1407 } else {
1408 None
1409 }
1410 })
1411 .collect::<HashMap<_, ElementBox>>()
1412 }
1413
1414 pub fn background_executor(&self) -> &Arc<executor::Background> {
1415 &self.background
1416 }
1417
1418 pub fn font_cache(&self) -> &FontCache {
1419 &self.font_cache
1420 }
1421
1422 pub fn thread_pool(&self) -> &scoped_pool::Pool {
1423 &self.thread_pool
1424 }
1425
1426 pub fn value<Tag: 'static, T: 'static + Default>(&self, id: usize) -> ValueHandle<T> {
1427 let key = (TypeId::of::<Tag>(), id);
1428 let mut values = self.values.write();
1429 values.entry(key).or_insert_with(|| Box::new(T::default()));
1430 ValueHandle::new(TypeId::of::<Tag>(), id, &self.ref_counts)
1431 }
1432}
1433
1434impl ReadModel for AppContext {
1435 fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T {
1436 if let Some(model) = self.models.get(&handle.model_id) {
1437 model
1438 .as_any()
1439 .downcast_ref()
1440 .expect("downcast should be type safe")
1441 } else {
1442 panic!("circular model reference");
1443 }
1444 }
1445}
1446
1447impl ReadView for AppContext {
1448 fn read_view<T: View>(&self, handle: &ViewHandle<T>) -> &T {
1449 if let Some(view) = self.views.get(&(handle.window_id, handle.view_id)) {
1450 view.as_any()
1451 .downcast_ref()
1452 .expect("downcast should be type safe")
1453 } else {
1454 panic!("circular view reference");
1455 }
1456 }
1457}
1458
1459struct Window {
1460 root_view: AnyViewHandle,
1461 focused_view_id: usize,
1462 invalidation: Option<WindowInvalidation>,
1463}
1464
1465#[derive(Default, Clone)]
1466pub struct WindowInvalidation {
1467 pub updated: HashSet<usize>,
1468 pub removed: Vec<usize>,
1469}
1470
1471pub enum Effect {
1472 Event {
1473 entity_id: usize,
1474 payload: Box<dyn Any>,
1475 },
1476 ModelNotification {
1477 model_id: usize,
1478 },
1479 ViewNotification {
1480 window_id: usize,
1481 view_id: usize,
1482 },
1483 Focus {
1484 window_id: usize,
1485 view_id: usize,
1486 },
1487}
1488
1489pub trait AnyModel: Send + Sync {
1490 fn as_any(&self) -> &dyn Any;
1491 fn as_any_mut(&mut self) -> &mut dyn Any;
1492}
1493
1494impl<T> AnyModel for T
1495where
1496 T: Entity,
1497{
1498 fn as_any(&self) -> &dyn Any {
1499 self
1500 }
1501
1502 fn as_any_mut(&mut self) -> &mut dyn Any {
1503 self
1504 }
1505}
1506
1507pub trait AnyView: Send + Sync {
1508 fn as_any(&self) -> &dyn Any;
1509 fn as_any_mut(&mut self) -> &mut dyn Any;
1510 fn ui_name(&self) -> &'static str;
1511 fn render<'a>(&self, app: &AppContext) -> ElementBox;
1512 fn on_focus(&mut self, app: &mut MutableAppContext, window_id: usize, view_id: usize);
1513 fn on_blur(&mut self, app: &mut MutableAppContext, window_id: usize, view_id: usize);
1514 fn keymap_context(&self, app: &AppContext) -> keymap::Context;
1515}
1516
1517impl<T> AnyView for T
1518where
1519 T: View,
1520{
1521 fn as_any(&self) -> &dyn Any {
1522 self
1523 }
1524
1525 fn as_any_mut(&mut self) -> &mut dyn Any {
1526 self
1527 }
1528
1529 fn ui_name(&self) -> &'static str {
1530 T::ui_name()
1531 }
1532
1533 fn render<'a>(&self, app: &AppContext) -> ElementBox {
1534 View::render(self, app)
1535 }
1536
1537 fn on_focus(&mut self, app: &mut MutableAppContext, window_id: usize, view_id: usize) {
1538 let mut ctx = ViewContext::new(app, window_id, view_id);
1539 View::on_focus(self, &mut ctx);
1540 }
1541
1542 fn on_blur(&mut self, app: &mut MutableAppContext, window_id: usize, view_id: usize) {
1543 let mut ctx = ViewContext::new(app, window_id, view_id);
1544 View::on_blur(self, &mut ctx);
1545 }
1546
1547 fn keymap_context(&self, app: &AppContext) -> keymap::Context {
1548 View::keymap_context(self, app)
1549 }
1550}
1551
1552pub struct ModelContext<'a, T: ?Sized> {
1553 app: &'a mut MutableAppContext,
1554 model_id: usize,
1555 model_type: PhantomData<T>,
1556 halt_stream: bool,
1557}
1558
1559impl<'a, T: Entity> ModelContext<'a, T> {
1560 fn new(app: &'a mut MutableAppContext, model_id: usize) -> Self {
1561 Self {
1562 app,
1563 model_id,
1564 model_type: PhantomData,
1565 halt_stream: false,
1566 }
1567 }
1568
1569 pub fn background_executor(&self) -> &Arc<executor::Background> {
1570 &self.app.ctx.background
1571 }
1572
1573 pub fn thread_pool(&self) -> &scoped_pool::Pool {
1574 &self.app.ctx.thread_pool
1575 }
1576
1577 pub fn halt_stream(&mut self) {
1578 self.halt_stream = true;
1579 }
1580
1581 pub fn model_id(&self) -> usize {
1582 self.model_id
1583 }
1584
1585 pub fn add_model<S, F>(&mut self, build_model: F) -> ModelHandle<S>
1586 where
1587 S: Entity,
1588 F: FnOnce(&mut ModelContext<S>) -> S,
1589 {
1590 self.app.add_model(build_model)
1591 }
1592
1593 pub fn subscribe<S: Entity, F>(&mut self, handle: &ModelHandle<S>, mut callback: F)
1594 where
1595 S::Event: 'static,
1596 F: 'static + FnMut(&mut T, &S::Event, &mut ModelContext<T>),
1597 {
1598 self.app
1599 .subscriptions
1600 .entry(handle.model_id)
1601 .or_default()
1602 .push(Subscription::FromModel {
1603 model_id: self.model_id,
1604 callback: Box::new(move |model, payload, app, model_id| {
1605 let model = model.downcast_mut().expect("downcast is type safe");
1606 let payload = payload.downcast_ref().expect("downcast is type safe");
1607 let mut ctx = ModelContext::new(app, model_id);
1608 callback(model, payload, &mut ctx);
1609 }),
1610 });
1611 }
1612
1613 pub fn emit(&mut self, payload: T::Event) {
1614 self.app.pending_effects.push_back(Effect::Event {
1615 entity_id: self.model_id,
1616 payload: Box::new(payload),
1617 });
1618 }
1619
1620 pub fn observe<S, F>(&mut self, handle: &ModelHandle<S>, mut callback: F)
1621 where
1622 S: Entity,
1623 F: 'static + FnMut(&mut T, ModelHandle<S>, &mut ModelContext<T>),
1624 {
1625 self.app
1626 .model_observations
1627 .entry(handle.model_id)
1628 .or_default()
1629 .push(ModelObservation::FromModel {
1630 model_id: self.model_id,
1631 callback: Box::new(move |model, observed_id, app, model_id| {
1632 let model = model.downcast_mut().expect("downcast is type safe");
1633 let observed = ModelHandle::new(observed_id, &app.ctx.ref_counts);
1634 let mut ctx = ModelContext::new(app, model_id);
1635 callback(model, observed, &mut ctx);
1636 }),
1637 });
1638 }
1639
1640 pub fn notify(&mut self) {
1641 self.app
1642 .pending_effects
1643 .push_back(Effect::ModelNotification {
1644 model_id: self.model_id,
1645 });
1646 }
1647
1648 pub fn handle(&self) -> ModelHandle<T> {
1649 ModelHandle::new(self.model_id, &self.app.ctx.ref_counts)
1650 }
1651
1652 pub fn spawn<S, F, U>(&mut self, future: S, callback: F) -> EntityTask<U>
1653 where
1654 S: 'static + Future,
1655 F: 'static + FnOnce(&mut T, S::Output, &mut ModelContext<T>) -> U,
1656 U: 'static,
1657 {
1658 let handle = self.handle();
1659 let weak_handle = handle.downgrade();
1660 let task = self
1661 .app
1662 .spawn::<S, U>(Spawner::Model(handle.into()), future);
1663
1664 self.app.future_handlers.borrow_mut().insert(
1665 task.id,
1666 Box::new(move |output, ctx| {
1667 weak_handle.upgrade(ctx.as_ref()).map(|handle| {
1668 let output = *output.downcast().unwrap();
1669 handle.update(ctx, |model, ctx| {
1670 Box::new(callback(model, output, ctx)) as Box<dyn Any>
1671 })
1672 })
1673 }),
1674 );
1675
1676 task
1677 }
1678
1679 pub fn spawn_stream<S, F, G, U>(
1680 &mut self,
1681 stream: S,
1682 mut item_callback: F,
1683 done_callback: G,
1684 ) -> EntityTask<U>
1685 where
1686 S: 'static + Stream + Unpin,
1687 F: 'static + FnMut(&mut T, S::Item, &mut ModelContext<T>),
1688 G: 'static + FnOnce(&mut T, &mut ModelContext<T>) -> U,
1689 U: 'static + Any,
1690 {
1691 let handle = self.handle();
1692 let weak_handle = handle.downgrade();
1693 let task = self.app.spawn_stream(Spawner::Model(handle.into()), stream);
1694
1695 self.app.stream_handlers.borrow_mut().insert(
1696 task.id,
1697 StreamHandler {
1698 item_callback: {
1699 let weak_handle = weak_handle.clone();
1700 Box::new(move |output, app| {
1701 if let Some(handle) = weak_handle.upgrade(app.as_ref()) {
1702 let output = *output.downcast().unwrap();
1703 handle.update(app, |model, ctx| {
1704 item_callback(model, output, ctx);
1705 ctx.halt_stream
1706 })
1707 } else {
1708 true
1709 }
1710 })
1711 },
1712 done_callback: Box::new(move |app| {
1713 weak_handle.upgrade(app.as_ref()).map(|handle| {
1714 handle.update(app, |model, ctx| Box::new(done_callback(model, ctx)))
1715 as Box<dyn Any>
1716 })
1717 }),
1718 },
1719 );
1720
1721 task
1722 }
1723}
1724
1725impl<M> AsRef<AppContext> for ModelContext<'_, M> {
1726 fn as_ref(&self) -> &AppContext {
1727 &self.app.ctx
1728 }
1729}
1730
1731impl<M> AsMut<MutableAppContext> for ModelContext<'_, M> {
1732 fn as_mut(&mut self) -> &mut MutableAppContext {
1733 self.app
1734 }
1735}
1736
1737impl<M> ReadModel for ModelContext<'_, M> {
1738 fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T {
1739 self.app.read_model(handle)
1740 }
1741}
1742
1743impl<M> UpdateModel for ModelContext<'_, M> {
1744 fn update_model<T, F, S>(&mut self, handle: &ModelHandle<T>, update: F) -> S
1745 where
1746 T: Entity,
1747 F: FnOnce(&mut T, &mut ModelContext<T>) -> S,
1748 {
1749 self.app.update_model(handle, update)
1750 }
1751}
1752
1753pub struct ViewContext<'a, T: ?Sized> {
1754 app: &'a mut MutableAppContext,
1755 window_id: usize,
1756 view_id: usize,
1757 view_type: PhantomData<T>,
1758 halt_action_dispatch: bool,
1759 halt_stream: bool,
1760}
1761
1762impl<'a, T: View> ViewContext<'a, T> {
1763 fn new(app: &'a mut MutableAppContext, window_id: usize, view_id: usize) -> Self {
1764 Self {
1765 app,
1766 window_id,
1767 view_id,
1768 view_type: PhantomData,
1769 halt_action_dispatch: true,
1770 halt_stream: false,
1771 }
1772 }
1773
1774 pub fn handle(&self) -> ViewHandle<T> {
1775 ViewHandle::new(self.window_id, self.view_id, &self.app.ctx.ref_counts)
1776 }
1777
1778 pub fn window_id(&self) -> usize {
1779 self.window_id
1780 }
1781
1782 pub fn view_id(&self) -> usize {
1783 self.view_id
1784 }
1785
1786 pub fn foreground(&self) -> &Rc<executor::Foreground> {
1787 self.app.foreground_executor()
1788 }
1789
1790 pub fn background_executor(&self) -> &Arc<executor::Background> {
1791 &self.app.ctx.background
1792 }
1793
1794 pub fn prompt<F>(&self, level: PromptLevel, msg: &str, answers: &[&str], done_fn: F)
1795 where
1796 F: 'static + FnOnce(usize, &mut MutableAppContext),
1797 {
1798 self.app
1799 .prompt(self.window_id, level, msg, answers, done_fn)
1800 }
1801
1802 pub fn prompt_for_paths<F>(&self, options: PathPromptOptions, done_fn: F)
1803 where
1804 F: 'static + FnOnce(Option<Vec<PathBuf>>, &mut MutableAppContext),
1805 {
1806 self.app.prompt_for_paths(options, done_fn)
1807 }
1808
1809 pub fn prompt_for_new_path<F>(&self, directory: &Path, done_fn: F)
1810 where
1811 F: 'static + FnOnce(Option<PathBuf>, &mut MutableAppContext),
1812 {
1813 self.app.prompt_for_new_path(directory, done_fn)
1814 }
1815
1816 pub fn debug_elements(&self) -> crate::json::Value {
1817 self.app.debug_elements(self.window_id).unwrap()
1818 }
1819
1820 pub fn focus<S>(&mut self, handle: S)
1821 where
1822 S: Into<AnyViewHandle>,
1823 {
1824 let handle = handle.into();
1825 self.app.pending_effects.push_back(Effect::Focus {
1826 window_id: handle.window_id,
1827 view_id: handle.view_id,
1828 });
1829 }
1830
1831 pub fn focus_self(&mut self) {
1832 self.app.pending_effects.push_back(Effect::Focus {
1833 window_id: self.window_id,
1834 view_id: self.view_id,
1835 });
1836 }
1837
1838 pub fn add_model<S, F>(&mut self, build_model: F) -> ModelHandle<S>
1839 where
1840 S: Entity,
1841 F: FnOnce(&mut ModelContext<S>) -> S,
1842 {
1843 self.app.add_model(build_model)
1844 }
1845
1846 pub fn add_view<S, F>(&mut self, build_view: F) -> ViewHandle<S>
1847 where
1848 S: View,
1849 F: FnOnce(&mut ViewContext<S>) -> S,
1850 {
1851 self.app.add_view(self.window_id, build_view)
1852 }
1853
1854 pub fn add_option_view<S, F>(&mut self, build_view: F) -> Option<ViewHandle<S>>
1855 where
1856 S: View,
1857 F: FnOnce(&mut ViewContext<S>) -> Option<S>,
1858 {
1859 self.app.add_option_view(self.window_id, build_view)
1860 }
1861
1862 pub fn subscribe_to_model<E, F>(&mut self, handle: &ModelHandle<E>, mut callback: F)
1863 where
1864 E: Entity,
1865 E::Event: 'static,
1866 F: 'static + FnMut(&mut T, ModelHandle<E>, &E::Event, &mut ViewContext<T>),
1867 {
1868 let emitter_handle = handle.downgrade();
1869 self.subscribe(handle, move |model, payload, ctx| {
1870 if let Some(emitter_handle) = emitter_handle.upgrade(ctx.as_ref()) {
1871 callback(model, emitter_handle, payload, ctx);
1872 }
1873 });
1874 }
1875
1876 pub fn subscribe_to_view<V, F>(&mut self, handle: &ViewHandle<V>, mut callback: F)
1877 where
1878 V: View,
1879 V::Event: 'static,
1880 F: 'static + FnMut(&mut T, ViewHandle<V>, &V::Event, &mut ViewContext<T>),
1881 {
1882 let emitter_handle = handle.downgrade();
1883 self.subscribe(handle, move |view, payload, ctx| {
1884 if let Some(emitter_handle) = emitter_handle.upgrade(ctx.as_ref()) {
1885 callback(view, emitter_handle, payload, ctx);
1886 }
1887 });
1888 }
1889
1890 pub fn subscribe<E, F>(&mut self, handle: &impl Handle<E>, mut callback: F)
1891 where
1892 E: Entity,
1893 E::Event: 'static,
1894 F: 'static + FnMut(&mut T, &E::Event, &mut ViewContext<T>),
1895 {
1896 self.app
1897 .subscriptions
1898 .entry(handle.id())
1899 .or_default()
1900 .push(Subscription::FromView {
1901 window_id: self.window_id,
1902 view_id: self.view_id,
1903 callback: Box::new(move |entity, payload, app, window_id, view_id| {
1904 let entity = entity.downcast_mut().expect("downcast is type safe");
1905 let payload = payload.downcast_ref().expect("downcast is type safe");
1906 let mut ctx = ViewContext::new(app, window_id, view_id);
1907 callback(entity, payload, &mut ctx);
1908 }),
1909 });
1910 }
1911
1912 pub fn emit(&mut self, payload: T::Event) {
1913 self.app.pending_effects.push_back(Effect::Event {
1914 entity_id: self.view_id,
1915 payload: Box::new(payload),
1916 });
1917 }
1918
1919 pub fn observe_model<S, F>(&mut self, handle: &ModelHandle<S>, mut callback: F)
1920 where
1921 S: Entity,
1922 F: 'static + FnMut(&mut T, ModelHandle<S>, &mut ViewContext<T>),
1923 {
1924 self.app
1925 .model_observations
1926 .entry(handle.id())
1927 .or_default()
1928 .push(ModelObservation::FromView {
1929 window_id: self.window_id,
1930 view_id: self.view_id,
1931 callback: Box::new(move |view, observed_id, app, window_id, view_id| {
1932 let view = view.downcast_mut().expect("downcast is type safe");
1933 let observed = ModelHandle::new(observed_id, &app.ctx.ref_counts);
1934 let mut ctx = ViewContext::new(app, window_id, view_id);
1935 callback(view, observed, &mut ctx);
1936 }),
1937 });
1938 }
1939
1940 pub fn observe_view<S, F>(&mut self, handle: &ViewHandle<S>, mut callback: F)
1941 where
1942 S: View,
1943 F: 'static + FnMut(&mut T, ViewHandle<S>, &mut ViewContext<T>),
1944 {
1945 self.app
1946 .view_observations
1947 .entry(handle.id())
1948 .or_default()
1949 .push(ViewObservation {
1950 window_id: self.window_id,
1951 view_id: self.view_id,
1952 callback: Box::new(
1953 move |view,
1954 observed_view_id,
1955 observed_window_id,
1956 app,
1957 observing_window_id,
1958 observing_view_id| {
1959 let view = view.downcast_mut().expect("downcast is type safe");
1960 let observed_handle = ViewHandle::new(
1961 observed_view_id,
1962 observed_window_id,
1963 &app.ctx.ref_counts,
1964 );
1965 let mut ctx = ViewContext::new(app, observing_window_id, observing_view_id);
1966 callback(view, observed_handle, &mut ctx);
1967 },
1968 ),
1969 });
1970 }
1971
1972 pub fn notify(&mut self) {
1973 self.app.notify_view(self.window_id, self.view_id);
1974 }
1975
1976 pub fn propagate_action(&mut self) {
1977 self.halt_action_dispatch = false;
1978 }
1979
1980 pub fn halt_stream(&mut self) {
1981 self.halt_stream = true;
1982 }
1983
1984 pub fn spawn<S, F, U>(&mut self, future: S, callback: F) -> EntityTask<U>
1985 where
1986 S: 'static + Future,
1987 F: 'static + FnOnce(&mut T, S::Output, &mut ViewContext<T>) -> U,
1988 U: 'static,
1989 {
1990 let handle = self.handle();
1991 let weak_handle = handle.downgrade();
1992 let task = self.app.spawn(Spawner::View(handle.into()), future);
1993
1994 self.app.future_handlers.borrow_mut().insert(
1995 task.id,
1996 Box::new(move |output, app| {
1997 weak_handle.upgrade(app.as_ref()).map(|handle| {
1998 let output = *output.downcast().unwrap();
1999 handle.update(app, |view, ctx| {
2000 Box::new(callback(view, output, ctx)) as Box<dyn Any>
2001 })
2002 })
2003 }),
2004 );
2005
2006 task
2007 }
2008
2009 pub fn spawn_stream<S, F, G, U>(
2010 &mut self,
2011 stream: S,
2012 mut item_callback: F,
2013 done_callback: G,
2014 ) -> EntityTask<U>
2015 where
2016 S: 'static + Stream + Unpin,
2017 F: 'static + FnMut(&mut T, S::Item, &mut ViewContext<T>),
2018 G: 'static + FnOnce(&mut T, &mut ViewContext<T>) -> U,
2019 U: 'static + Any,
2020 {
2021 let handle = self.handle();
2022 let weak_handle = handle.downgrade();
2023 let task = self.app.spawn_stream(Spawner::View(handle.into()), stream);
2024 self.app.stream_handlers.borrow_mut().insert(
2025 task.id,
2026 StreamHandler {
2027 item_callback: {
2028 let weak_handle = weak_handle.clone();
2029 Box::new(move |output, ctx| {
2030 if let Some(handle) = weak_handle.upgrade(ctx.as_ref()) {
2031 let output = *output.downcast().unwrap();
2032 handle.update(ctx, |view, ctx| {
2033 item_callback(view, output, ctx);
2034 ctx.halt_stream
2035 })
2036 } else {
2037 true
2038 }
2039 })
2040 },
2041 done_callback: Box::new(move |ctx| {
2042 weak_handle.upgrade(ctx.as_ref()).map(|handle| {
2043 handle.update(ctx, |view, ctx| {
2044 Box::new(done_callback(view, ctx)) as Box<dyn Any>
2045 })
2046 })
2047 }),
2048 },
2049 );
2050 task
2051 }
2052}
2053
2054impl AsRef<AppContext> for &AppContext {
2055 fn as_ref(&self) -> &AppContext {
2056 self
2057 }
2058}
2059
2060impl<M> AsRef<AppContext> for ViewContext<'_, M> {
2061 fn as_ref(&self) -> &AppContext {
2062 &self.app.ctx
2063 }
2064}
2065
2066impl<M> AsMut<MutableAppContext> for ViewContext<'_, M> {
2067 fn as_mut(&mut self) -> &mut MutableAppContext {
2068 self.app
2069 }
2070}
2071
2072impl<V> ReadModel for ViewContext<'_, V> {
2073 fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T {
2074 self.app.read_model(handle)
2075 }
2076}
2077
2078impl<V: View> UpdateModel for ViewContext<'_, V> {
2079 fn update_model<T, F, S>(&mut self, handle: &ModelHandle<T>, update: F) -> S
2080 where
2081 T: Entity,
2082 F: FnOnce(&mut T, &mut ModelContext<T>) -> S,
2083 {
2084 self.app.update_model(handle, update)
2085 }
2086}
2087
2088impl<V: View> ReadView for ViewContext<'_, V> {
2089 fn read_view<T: View>(&self, handle: &ViewHandle<T>) -> &T {
2090 self.app.read_view(handle)
2091 }
2092}
2093
2094impl<V: View> UpdateView for ViewContext<'_, V> {
2095 fn update_view<T, F, S>(&mut self, handle: &ViewHandle<T>, update: F) -> S
2096 where
2097 T: View,
2098 F: FnOnce(&mut T, &mut ViewContext<T>) -> S,
2099 {
2100 self.app.update_view(handle, update)
2101 }
2102}
2103
2104pub trait Handle<T> {
2105 fn id(&self) -> usize;
2106 fn location(&self) -> EntityLocation;
2107}
2108
2109#[derive(Clone, Copy, Debug, Eq, PartialEq, Hash)]
2110pub enum EntityLocation {
2111 Model(usize),
2112 View(usize, usize),
2113}
2114
2115pub struct ModelHandle<T> {
2116 model_id: usize,
2117 model_type: PhantomData<T>,
2118 ref_counts: Arc<Mutex<RefCounts>>,
2119}
2120
2121impl<T: Entity> ModelHandle<T> {
2122 fn new(model_id: usize, ref_counts: &Arc<Mutex<RefCounts>>) -> Self {
2123 ref_counts.lock().inc_entity(model_id);
2124 Self {
2125 model_id,
2126 model_type: PhantomData,
2127 ref_counts: ref_counts.clone(),
2128 }
2129 }
2130
2131 pub fn downgrade(&self) -> WeakModelHandle<T> {
2132 WeakModelHandle::new(self.model_id)
2133 }
2134
2135 pub fn id(&self) -> usize {
2136 self.model_id
2137 }
2138
2139 pub fn read<'a, A: ReadModel>(&self, app: &'a A) -> &'a T {
2140 app.read_model(self)
2141 }
2142
2143 pub fn update<A, F, S>(&self, app: &mut A, update: F) -> S
2144 where
2145 A: UpdateModel,
2146 F: FnOnce(&mut T, &mut ModelContext<T>) -> S,
2147 {
2148 app.update_model(self, update)
2149 }
2150
2151 pub fn condition(
2152 &self,
2153 ctx: &TestAppContext,
2154 predicate: impl FnMut(&T, &AppContext) -> bool,
2155 ) -> impl Future<Output = ()> {
2156 self.condition_with_duration(Duration::from_millis(100), ctx, predicate)
2157 }
2158
2159 pub fn condition_with_duration(
2160 &self,
2161 duration: Duration,
2162 ctx: &TestAppContext,
2163 mut predicate: impl FnMut(&T, &AppContext) -> bool,
2164 ) -> impl Future<Output = ()> {
2165 let (tx, mut rx) = mpsc::channel(1024);
2166
2167 let mut ctx = ctx.0.borrow_mut();
2168 self.update(&mut *ctx, |_, ctx| {
2169 ctx.observe(self, {
2170 let mut tx = tx.clone();
2171 move |_, _, _| {
2172 tx.blocking_send(()).ok();
2173 }
2174 });
2175 ctx.subscribe(self, {
2176 let mut tx = tx.clone();
2177 move |_, _, _| {
2178 tx.blocking_send(()).ok();
2179 }
2180 })
2181 });
2182
2183 let ctx = ctx.weak_self.as_ref().unwrap().upgrade().unwrap();
2184 let handle = self.downgrade();
2185
2186 async move {
2187 timeout(duration, async move {
2188 loop {
2189 {
2190 let ctx = ctx.borrow();
2191 let ctx = ctx.as_ref();
2192 if predicate(
2193 handle
2194 .upgrade(ctx)
2195 .expect("model dropped with pending condition")
2196 .read(ctx),
2197 ctx,
2198 ) {
2199 break;
2200 }
2201 }
2202
2203 rx.recv()
2204 .await
2205 .expect("model dropped with pending condition");
2206 }
2207 })
2208 .await
2209 .expect("condition timed out");
2210 }
2211 }
2212}
2213
2214impl<T> Clone for ModelHandle<T> {
2215 fn clone(&self) -> Self {
2216 self.ref_counts.lock().inc_entity(self.model_id);
2217 Self {
2218 model_id: self.model_id,
2219 model_type: PhantomData,
2220 ref_counts: self.ref_counts.clone(),
2221 }
2222 }
2223}
2224
2225impl<T> PartialEq for ModelHandle<T> {
2226 fn eq(&self, other: &Self) -> bool {
2227 self.model_id == other.model_id
2228 }
2229}
2230
2231impl<T> Eq for ModelHandle<T> {}
2232
2233impl<T> Hash for ModelHandle<T> {
2234 fn hash<H: Hasher>(&self, state: &mut H) {
2235 self.model_id.hash(state);
2236 }
2237}
2238
2239impl<T> std::borrow::Borrow<usize> for ModelHandle<T> {
2240 fn borrow(&self) -> &usize {
2241 &self.model_id
2242 }
2243}
2244
2245impl<T> Debug for ModelHandle<T> {
2246 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
2247 f.debug_tuple(&format!("ModelHandle<{}>", type_name::<T>()))
2248 .field(&self.model_id)
2249 .finish()
2250 }
2251}
2252
2253unsafe impl<T> Send for ModelHandle<T> {}
2254unsafe impl<T> Sync for ModelHandle<T> {}
2255
2256impl<T> Drop for ModelHandle<T> {
2257 fn drop(&mut self) {
2258 self.ref_counts.lock().dec_model(self.model_id);
2259 }
2260}
2261
2262impl<T> Handle<T> for ModelHandle<T> {
2263 fn id(&self) -> usize {
2264 self.model_id
2265 }
2266
2267 fn location(&self) -> EntityLocation {
2268 EntityLocation::Model(self.model_id)
2269 }
2270}
2271
2272pub struct WeakModelHandle<T> {
2273 model_id: usize,
2274 model_type: PhantomData<T>,
2275}
2276
2277impl<T: Entity> WeakModelHandle<T> {
2278 fn new(model_id: usize) -> Self {
2279 Self {
2280 model_id,
2281 model_type: PhantomData,
2282 }
2283 }
2284
2285 pub fn upgrade(&self, app: &AppContext) -> Option<ModelHandle<T>> {
2286 if app.models.contains_key(&self.model_id) {
2287 Some(ModelHandle::new(self.model_id, &app.ref_counts))
2288 } else {
2289 None
2290 }
2291 }
2292}
2293
2294impl<T> Clone for WeakModelHandle<T> {
2295 fn clone(&self) -> Self {
2296 Self {
2297 model_id: self.model_id,
2298 model_type: PhantomData,
2299 }
2300 }
2301}
2302
2303pub struct ViewHandle<T> {
2304 window_id: usize,
2305 view_id: usize,
2306 view_type: PhantomData<T>,
2307 ref_counts: Arc<Mutex<RefCounts>>,
2308}
2309
2310impl<T: View> ViewHandle<T> {
2311 fn new(window_id: usize, view_id: usize, ref_counts: &Arc<Mutex<RefCounts>>) -> Self {
2312 ref_counts.lock().inc_entity(view_id);
2313 Self {
2314 window_id,
2315 view_id,
2316 view_type: PhantomData,
2317 ref_counts: ref_counts.clone(),
2318 }
2319 }
2320
2321 pub fn downgrade(&self) -> WeakViewHandle<T> {
2322 WeakViewHandle::new(self.window_id, self.view_id)
2323 }
2324
2325 pub fn window_id(&self) -> usize {
2326 self.window_id
2327 }
2328
2329 pub fn id(&self) -> usize {
2330 self.view_id
2331 }
2332
2333 pub fn read<'a, A: ReadView>(&self, app: &'a A) -> &'a T {
2334 app.read_view(self)
2335 }
2336
2337 pub fn update<A, F, S>(&self, app: &mut A, update: F) -> S
2338 where
2339 A: UpdateView,
2340 F: FnOnce(&mut T, &mut ViewContext<T>) -> S,
2341 {
2342 app.update_view(self, update)
2343 }
2344
2345 pub fn is_focused(&self, app: &AppContext) -> bool {
2346 app.focused_view_id(self.window_id)
2347 .map_or(false, |focused_id| focused_id == self.view_id)
2348 }
2349
2350 pub fn condition(
2351 &self,
2352 ctx: &TestAppContext,
2353 predicate: impl FnMut(&T, &AppContext) -> bool,
2354 ) -> impl Future<Output = ()> {
2355 self.condition_with_duration(Duration::from_millis(500), ctx, predicate)
2356 }
2357
2358 pub fn condition_with_duration(
2359 &self,
2360 duration: Duration,
2361 ctx: &TestAppContext,
2362 mut predicate: impl FnMut(&T, &AppContext) -> bool,
2363 ) -> impl Future<Output = ()> {
2364 let (tx, mut rx) = mpsc::channel(1024);
2365
2366 let mut ctx = ctx.0.borrow_mut();
2367 self.update(&mut *ctx, |_, ctx| {
2368 ctx.observe_view(self, {
2369 let mut tx = tx.clone();
2370 move |_, _, _| {
2371 tx.blocking_send(()).ok();
2372 }
2373 });
2374
2375 ctx.subscribe(self, {
2376 let mut tx = tx.clone();
2377 move |_, _, _| {
2378 tx.blocking_send(()).ok();
2379 }
2380 })
2381 });
2382
2383 let ctx = ctx.weak_self.as_ref().unwrap().upgrade().unwrap();
2384 let handle = self.downgrade();
2385
2386 async move {
2387 timeout(duration, async move {
2388 loop {
2389 {
2390 let ctx = ctx.borrow();
2391 let ctx = ctx.as_ref();
2392 if predicate(
2393 handle
2394 .upgrade(ctx)
2395 .expect("view dropped with pending condition")
2396 .read(ctx),
2397 ctx,
2398 ) {
2399 break;
2400 }
2401 }
2402
2403 rx.recv()
2404 .await
2405 .expect("view dropped with pending condition");
2406 }
2407 })
2408 .await
2409 .expect("condition timed out");
2410 }
2411 }
2412}
2413
2414impl<T> Clone for ViewHandle<T> {
2415 fn clone(&self) -> Self {
2416 self.ref_counts.lock().inc_entity(self.view_id);
2417 Self {
2418 window_id: self.window_id,
2419 view_id: self.view_id,
2420 view_type: PhantomData,
2421 ref_counts: self.ref_counts.clone(),
2422 }
2423 }
2424}
2425
2426impl<T> PartialEq for ViewHandle<T> {
2427 fn eq(&self, other: &Self) -> bool {
2428 self.window_id == other.window_id && self.view_id == other.view_id
2429 }
2430}
2431
2432impl<T> Eq for ViewHandle<T> {}
2433
2434impl<T> Debug for ViewHandle<T> {
2435 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
2436 f.debug_struct(&format!("ViewHandle<{}>", type_name::<T>()))
2437 .field("window_id", &self.window_id)
2438 .field("view_id", &self.view_id)
2439 .finish()
2440 }
2441}
2442
2443impl<T> Drop for ViewHandle<T> {
2444 fn drop(&mut self) {
2445 self.ref_counts
2446 .lock()
2447 .dec_view(self.window_id, self.view_id);
2448 }
2449}
2450
2451impl<T> Handle<T> for ViewHandle<T> {
2452 fn id(&self) -> usize {
2453 self.view_id
2454 }
2455
2456 fn location(&self) -> EntityLocation {
2457 EntityLocation::View(self.window_id, self.view_id)
2458 }
2459}
2460
2461pub struct AnyViewHandle {
2462 window_id: usize,
2463 view_id: usize,
2464 view_type: TypeId,
2465 ref_counts: Arc<Mutex<RefCounts>>,
2466}
2467
2468impl AnyViewHandle {
2469 pub fn id(&self) -> usize {
2470 self.view_id
2471 }
2472
2473 pub fn is<T: 'static>(&self) -> bool {
2474 TypeId::of::<T>() == self.view_type
2475 }
2476
2477 pub fn downcast<T: View>(self) -> Option<ViewHandle<T>> {
2478 if self.is::<T>() {
2479 let result = Some(ViewHandle {
2480 window_id: self.window_id,
2481 view_id: self.view_id,
2482 ref_counts: self.ref_counts.clone(),
2483 view_type: PhantomData,
2484 });
2485 unsafe {
2486 Arc::decrement_strong_count(&self.ref_counts);
2487 }
2488 std::mem::forget(self);
2489 result
2490 } else {
2491 None
2492 }
2493 }
2494}
2495
2496impl Clone for AnyViewHandle {
2497 fn clone(&self) -> Self {
2498 self.ref_counts.lock().inc_entity(self.view_id);
2499 Self {
2500 window_id: self.window_id,
2501 view_id: self.view_id,
2502 view_type: self.view_type,
2503 ref_counts: self.ref_counts.clone(),
2504 }
2505 }
2506}
2507
2508impl<T: View> From<&ViewHandle<T>> for AnyViewHandle {
2509 fn from(handle: &ViewHandle<T>) -> Self {
2510 handle.ref_counts.lock().inc_entity(handle.view_id);
2511 AnyViewHandle {
2512 window_id: handle.window_id,
2513 view_id: handle.view_id,
2514 view_type: TypeId::of::<T>(),
2515 ref_counts: handle.ref_counts.clone(),
2516 }
2517 }
2518}
2519
2520impl<T: View> From<ViewHandle<T>> for AnyViewHandle {
2521 fn from(handle: ViewHandle<T>) -> Self {
2522 let any_handle = AnyViewHandle {
2523 window_id: handle.window_id,
2524 view_id: handle.view_id,
2525 view_type: TypeId::of::<T>(),
2526 ref_counts: handle.ref_counts.clone(),
2527 };
2528 unsafe {
2529 Arc::decrement_strong_count(&handle.ref_counts);
2530 }
2531 std::mem::forget(handle);
2532 any_handle
2533 }
2534}
2535
2536impl Drop for AnyViewHandle {
2537 fn drop(&mut self) {
2538 self.ref_counts
2539 .lock()
2540 .dec_view(self.window_id, self.view_id);
2541 }
2542}
2543
2544pub struct AnyModelHandle {
2545 model_id: usize,
2546 ref_counts: Arc<Mutex<RefCounts>>,
2547}
2548
2549impl<T: Entity> From<ModelHandle<T>> for AnyModelHandle {
2550 fn from(handle: ModelHandle<T>) -> Self {
2551 handle.ref_counts.lock().inc_entity(handle.model_id);
2552 Self {
2553 model_id: handle.model_id,
2554 ref_counts: handle.ref_counts.clone(),
2555 }
2556 }
2557}
2558
2559impl Drop for AnyModelHandle {
2560 fn drop(&mut self) {
2561 self.ref_counts.lock().dec_model(self.model_id);
2562 }
2563}
2564pub struct WeakViewHandle<T> {
2565 window_id: usize,
2566 view_id: usize,
2567 view_type: PhantomData<T>,
2568}
2569
2570impl<T: View> WeakViewHandle<T> {
2571 fn new(window_id: usize, view_id: usize) -> Self {
2572 Self {
2573 window_id,
2574 view_id,
2575 view_type: PhantomData,
2576 }
2577 }
2578
2579 pub fn upgrade(&self, ctx: impl AsRef<AppContext>) -> Option<ViewHandle<T>> {
2580 let ctx = ctx.as_ref();
2581 if ctx.ref_counts.lock().is_entity_alive(self.view_id) {
2582 Some(ViewHandle::new(
2583 self.window_id,
2584 self.view_id,
2585 &ctx.ref_counts,
2586 ))
2587 } else {
2588 None
2589 }
2590 }
2591}
2592
2593impl<T> Clone for WeakViewHandle<T> {
2594 fn clone(&self) -> Self {
2595 Self {
2596 window_id: self.window_id,
2597 view_id: self.view_id,
2598 view_type: PhantomData,
2599 }
2600 }
2601}
2602
2603pub struct ValueHandle<T> {
2604 value_type: PhantomData<T>,
2605 tag_type_id: TypeId,
2606 id: usize,
2607 ref_counts: Weak<Mutex<RefCounts>>,
2608}
2609
2610impl<T: 'static> ValueHandle<T> {
2611 fn new(tag_type_id: TypeId, id: usize, ref_counts: &Arc<Mutex<RefCounts>>) -> Self {
2612 ref_counts.lock().inc_value(tag_type_id, id);
2613 Self {
2614 value_type: PhantomData,
2615 tag_type_id,
2616 id,
2617 ref_counts: Arc::downgrade(ref_counts),
2618 }
2619 }
2620
2621 pub fn read<R>(&self, ctx: &AppContext, f: impl FnOnce(&T) -> R) -> R {
2622 f(ctx
2623 .values
2624 .read()
2625 .get(&(self.tag_type_id, self.id))
2626 .unwrap()
2627 .downcast_ref()
2628 .unwrap())
2629 }
2630
2631 pub fn update<R>(&self, ctx: &AppContext, f: impl FnOnce(&mut T) -> R) -> R {
2632 f(ctx
2633 .values
2634 .write()
2635 .get_mut(&(self.tag_type_id, self.id))
2636 .unwrap()
2637 .downcast_mut()
2638 .unwrap())
2639 }
2640}
2641
2642impl<T> Drop for ValueHandle<T> {
2643 fn drop(&mut self) {
2644 if let Some(ref_counts) = self.ref_counts.upgrade() {
2645 ref_counts.lock().dec_value(self.tag_type_id, self.id);
2646 }
2647 }
2648}
2649
2650#[derive(Default)]
2651struct RefCounts {
2652 entity_counts: HashMap<usize, usize>,
2653 value_counts: HashMap<(TypeId, usize), usize>,
2654 dropped_models: HashSet<usize>,
2655 dropped_views: HashSet<(usize, usize)>,
2656 dropped_values: HashSet<(TypeId, usize)>,
2657}
2658
2659impl RefCounts {
2660 fn inc_entity(&mut self, entity_id: usize) {
2661 *self.entity_counts.entry(entity_id).or_insert(0) += 1;
2662 }
2663
2664 fn inc_value(&mut self, tag_type_id: TypeId, id: usize) {
2665 *self.value_counts.entry((tag_type_id, id)).or_insert(0) += 1;
2666 }
2667
2668 fn dec_model(&mut self, model_id: usize) {
2669 let count = self.entity_counts.get_mut(&model_id).unwrap();
2670 *count -= 1;
2671 if *count == 0 {
2672 self.entity_counts.remove(&model_id);
2673 self.dropped_models.insert(model_id);
2674 }
2675 }
2676
2677 fn dec_view(&mut self, window_id: usize, view_id: usize) {
2678 let count = self.entity_counts.get_mut(&view_id).unwrap();
2679 *count -= 1;
2680 if *count == 0 {
2681 self.entity_counts.remove(&view_id);
2682 self.dropped_views.insert((window_id, view_id));
2683 }
2684 }
2685
2686 fn dec_value(&mut self, tag_type_id: TypeId, id: usize) {
2687 let key = (tag_type_id, id);
2688 let count = self.value_counts.get_mut(&key).unwrap();
2689 *count -= 1;
2690 if *count == 0 {
2691 self.value_counts.remove(&key);
2692 self.dropped_values.insert(key);
2693 }
2694 }
2695
2696 fn is_entity_alive(&self, entity_id: usize) -> bool {
2697 self.entity_counts.contains_key(&entity_id)
2698 }
2699
2700 fn take_dropped(
2701 &mut self,
2702 ) -> (
2703 HashSet<usize>,
2704 HashSet<(usize, usize)>,
2705 HashSet<(TypeId, usize)>,
2706 ) {
2707 let mut dropped_models = HashSet::new();
2708 let mut dropped_views = HashSet::new();
2709 let mut dropped_values = HashSet::new();
2710 std::mem::swap(&mut self.dropped_models, &mut dropped_models);
2711 std::mem::swap(&mut self.dropped_views, &mut dropped_views);
2712 std::mem::swap(&mut self.dropped_values, &mut dropped_values);
2713 (dropped_models, dropped_views, dropped_values)
2714 }
2715}
2716
2717enum Subscription {
2718 FromModel {
2719 model_id: usize,
2720 callback: Box<dyn FnMut(&mut dyn Any, &dyn Any, &mut MutableAppContext, usize)>,
2721 },
2722 FromView {
2723 window_id: usize,
2724 view_id: usize,
2725 callback: Box<dyn FnMut(&mut dyn Any, &dyn Any, &mut MutableAppContext, usize, usize)>,
2726 },
2727}
2728
2729enum ModelObservation {
2730 FromModel {
2731 model_id: usize,
2732 callback: Box<dyn FnMut(&mut dyn Any, usize, &mut MutableAppContext, usize)>,
2733 },
2734 FromView {
2735 window_id: usize,
2736 view_id: usize,
2737 callback: Box<dyn FnMut(&mut dyn Any, usize, &mut MutableAppContext, usize, usize)>,
2738 },
2739}
2740
2741struct ViewObservation {
2742 window_id: usize,
2743 view_id: usize,
2744 callback: Box<dyn FnMut(&mut dyn Any, usize, usize, &mut MutableAppContext, usize, usize)>,
2745}
2746
2747type FutureHandler = Box<dyn FnOnce(Box<dyn Any>, &mut MutableAppContext) -> Option<Box<dyn Any>>>;
2748
2749struct StreamHandler {
2750 item_callback: Box<dyn FnMut(Box<dyn Any>, &mut MutableAppContext) -> bool>,
2751 done_callback: Box<dyn FnOnce(&mut MutableAppContext) -> Option<Box<dyn Any>>>,
2752}
2753
2754#[must_use]
2755pub struct EntityTask<T> {
2756 id: usize,
2757 task: Option<executor::Task<Option<T>>>,
2758 _spawner: Spawner, // Keeps the spawning entity alive for as long as the task exists
2759 handler_map: TaskHandlerMap,
2760}
2761
2762pub enum Spawner {
2763 Model(AnyModelHandle),
2764 View(AnyViewHandle),
2765}
2766
2767enum TaskHandlerMap {
2768 Detached,
2769 Future(Rc<RefCell<HashMap<usize, FutureHandler>>>),
2770 Stream(Rc<RefCell<HashMap<usize, StreamHandler>>>),
2771}
2772
2773impl<T> EntityTask<T> {
2774 fn new(
2775 id: usize,
2776 task: executor::Task<Option<T>>,
2777 spawner: Spawner,
2778 handler_map: TaskHandlerMap,
2779 ) -> Self {
2780 Self {
2781 id,
2782 task: Some(task),
2783 _spawner: spawner,
2784 handler_map,
2785 }
2786 }
2787
2788 pub fn detach(mut self) {
2789 self.handler_map = TaskHandlerMap::Detached;
2790 self.task.take().unwrap().detach();
2791 }
2792
2793 pub async fn cancel(mut self) -> Option<T> {
2794 let task = self.task.take().unwrap();
2795 task.cancel().await.unwrap()
2796 }
2797}
2798
2799impl<T> Future for EntityTask<T> {
2800 type Output = T;
2801
2802 fn poll(
2803 self: std::pin::Pin<&mut Self>,
2804 ctx: &mut std::task::Context<'_>,
2805 ) -> std::task::Poll<Self::Output> {
2806 let task = unsafe { self.map_unchecked_mut(|task| task.task.as_mut().unwrap()) };
2807 task.poll(ctx).map(|output| output.unwrap())
2808 }
2809}
2810
2811impl<T> Drop for EntityTask<T> {
2812 fn drop(self: &mut Self) {
2813 match &self.handler_map {
2814 TaskHandlerMap::Detached => {
2815 return;
2816 }
2817 TaskHandlerMap::Future(map) => {
2818 map.borrow_mut().remove(&self.id);
2819 }
2820 TaskHandlerMap::Stream(map) => {
2821 map.borrow_mut().remove(&self.id);
2822 }
2823 }
2824 }
2825}
2826
2827#[cfg(test)]
2828mod tests {
2829 use super::*;
2830 use crate::elements::*;
2831 use smol::future::poll_once;
2832
2833 #[test]
2834 fn test_model_handles() {
2835 struct Model {
2836 other: Option<ModelHandle<Model>>,
2837 events: Vec<String>,
2838 }
2839
2840 impl Entity for Model {
2841 type Event = usize;
2842 }
2843
2844 impl Model {
2845 fn new(other: Option<ModelHandle<Self>>, ctx: &mut ModelContext<Self>) -> Self {
2846 if let Some(other) = other.as_ref() {
2847 ctx.observe(other, |me, _, _| {
2848 me.events.push("notified".into());
2849 });
2850 ctx.subscribe(other, |me, event, _| {
2851 me.events.push(format!("observed event {}", event));
2852 });
2853 }
2854
2855 Self {
2856 other,
2857 events: Vec::new(),
2858 }
2859 }
2860 }
2861
2862 App::test((), |app| {
2863 let handle_1 = app.add_model(|ctx| Model::new(None, ctx));
2864 let handle_2 = app.add_model(|ctx| Model::new(Some(handle_1.clone()), ctx));
2865 assert_eq!(app.ctx.models.len(), 2);
2866
2867 handle_1.update(app, |model, ctx| {
2868 model.events.push("updated".into());
2869 ctx.emit(1);
2870 ctx.notify();
2871 ctx.emit(2);
2872 });
2873 assert_eq!(handle_1.read(app).events, vec!["updated".to_string()]);
2874 assert_eq!(
2875 handle_2.read(app).events,
2876 vec![
2877 "observed event 1".to_string(),
2878 "notified".to_string(),
2879 "observed event 2".to_string(),
2880 ]
2881 );
2882
2883 handle_2.update(app, |model, _| {
2884 drop(handle_1);
2885 model.other.take();
2886 });
2887
2888 assert_eq!(app.ctx.models.len(), 1);
2889 assert!(app.subscriptions.is_empty());
2890 assert!(app.model_observations.is_empty());
2891 });
2892 }
2893
2894 #[test]
2895 fn test_subscribe_and_emit_from_model() {
2896 #[derive(Default)]
2897 struct Model {
2898 events: Vec<usize>,
2899 }
2900
2901 impl Entity for Model {
2902 type Event = usize;
2903 }
2904
2905 App::test((), |app| {
2906 let handle_1 = app.add_model(|_| Model::default());
2907 let handle_2 = app.add_model(|_| Model::default());
2908 let handle_2b = handle_2.clone();
2909
2910 handle_1.update(app, |_, c| {
2911 c.subscribe(&handle_2, move |model: &mut Model, event, c| {
2912 model.events.push(*event);
2913
2914 c.subscribe(&handle_2b, |model, event, _| {
2915 model.events.push(*event * 2);
2916 });
2917 });
2918 });
2919
2920 handle_2.update(app, |_, c| c.emit(7));
2921 assert_eq!(handle_1.read(app).events, vec![7]);
2922
2923 handle_2.update(app, |_, c| c.emit(5));
2924 assert_eq!(handle_1.read(app).events, vec![7, 10, 5]);
2925 })
2926 }
2927
2928 #[test]
2929 fn test_observe_and_notify_from_model() {
2930 #[derive(Default)]
2931 struct Model {
2932 count: usize,
2933 events: Vec<usize>,
2934 }
2935
2936 impl Entity for Model {
2937 type Event = ();
2938 }
2939
2940 App::test((), |app| {
2941 let handle_1 = app.add_model(|_| Model::default());
2942 let handle_2 = app.add_model(|_| Model::default());
2943 let handle_2b = handle_2.clone();
2944
2945 handle_1.update(app, |_, c| {
2946 c.observe(&handle_2, move |model, observed, c| {
2947 model.events.push(observed.read(c).count);
2948 c.observe(&handle_2b, |model, observed, c| {
2949 model.events.push(observed.read(c).count * 2);
2950 });
2951 });
2952 });
2953
2954 handle_2.update(app, |model, c| {
2955 model.count = 7;
2956 c.notify()
2957 });
2958 assert_eq!(handle_1.read(app).events, vec![7]);
2959
2960 handle_2.update(app, |model, c| {
2961 model.count = 5;
2962 c.notify()
2963 });
2964 assert_eq!(handle_1.read(app).events, vec![7, 10, 5])
2965 })
2966 }
2967
2968 #[test]
2969 fn test_spawn_from_model() {
2970 #[derive(Default)]
2971 struct Model {
2972 count: 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(async { 7 }, |model, output, _| {
2984 model.count = output;
2985 })
2986 })
2987 .await;
2988 app.read(|ctx| assert_eq!(handle.read(ctx).count, 7));
2989
2990 handle
2991 .update(&mut app, |_, c| {
2992 c.spawn(async { 14 }, |model, output, _| {
2993 model.count = output;
2994 })
2995 })
2996 .await;
2997 app.read(|ctx| assert_eq!(handle.read(ctx).count, 14));
2998 });
2999 }
3000
3001 #[test]
3002 fn test_spawn_stream_local_from_model() {
3003 #[derive(Default)]
3004 struct Model {
3005 events: Vec<Option<usize>>,
3006 }
3007
3008 impl Entity for Model {
3009 type Event = ();
3010 }
3011
3012 App::test_async((), |mut app| async move {
3013 let handle = app.add_model(|_| Model::default());
3014 handle
3015 .update(&mut app, |_, c| {
3016 c.spawn_stream(
3017 smol::stream::iter(vec![1, 2, 3]),
3018 |model, output, _| {
3019 model.events.push(Some(output));
3020 },
3021 |model, _| {
3022 model.events.push(None);
3023 },
3024 )
3025 })
3026 .await;
3027 app.read(|ctx| assert_eq!(handle.read(ctx).events, [Some(1), Some(2), Some(3), None]));
3028 })
3029 }
3030
3031 #[test]
3032 fn test_view_handles() {
3033 struct View {
3034 other: Option<ViewHandle<View>>,
3035 events: Vec<String>,
3036 }
3037
3038 impl Entity for View {
3039 type Event = usize;
3040 }
3041
3042 impl super::View for View {
3043 fn render<'a>(&self, _: &AppContext) -> ElementBox {
3044 Empty::new().boxed()
3045 }
3046
3047 fn ui_name() -> &'static str {
3048 "View"
3049 }
3050 }
3051
3052 impl View {
3053 fn new(other: Option<ViewHandle<View>>, ctx: &mut ViewContext<Self>) -> Self {
3054 if let Some(other) = other.as_ref() {
3055 ctx.subscribe_to_view(other, |me, _, event, _| {
3056 me.events.push(format!("observed event {}", event));
3057 });
3058 }
3059 Self {
3060 other,
3061 events: Vec::new(),
3062 }
3063 }
3064 }
3065
3066 App::test((), |app| {
3067 let (window_id, _) = app.add_window(|ctx| View::new(None, ctx));
3068 let handle_1 = app.add_view(window_id, |ctx| View::new(None, ctx));
3069 let handle_2 = app.add_view(window_id, |ctx| View::new(Some(handle_1.clone()), ctx));
3070 assert_eq!(app.ctx.views.len(), 3);
3071
3072 handle_1.update(app, |view, ctx| {
3073 view.events.push("updated".into());
3074 ctx.emit(1);
3075 ctx.emit(2);
3076 });
3077 assert_eq!(handle_1.read(app).events, vec!["updated".to_string()]);
3078 assert_eq!(
3079 handle_2.read(app).events,
3080 vec![
3081 "observed event 1".to_string(),
3082 "observed event 2".to_string(),
3083 ]
3084 );
3085
3086 handle_2.update(app, |view, _| {
3087 drop(handle_1);
3088 view.other.take();
3089 });
3090
3091 assert_eq!(app.ctx.views.len(), 2);
3092 assert!(app.subscriptions.is_empty());
3093 assert!(app.model_observations.is_empty());
3094 })
3095 }
3096
3097 #[test]
3098 fn test_subscribe_and_emit_from_view() {
3099 #[derive(Default)]
3100 struct View {
3101 events: Vec<usize>,
3102 }
3103
3104 impl Entity for View {
3105 type Event = usize;
3106 }
3107
3108 impl super::View for View {
3109 fn render<'a>(&self, _: &AppContext) -> ElementBox {
3110 Empty::new().boxed()
3111 }
3112
3113 fn ui_name() -> &'static str {
3114 "View"
3115 }
3116 }
3117
3118 struct Model;
3119
3120 impl Entity for Model {
3121 type Event = usize;
3122 }
3123
3124 App::test((), |app| {
3125 let (window_id, handle_1) = app.add_window(|_| View::default());
3126 let handle_2 = app.add_view(window_id, |_| View::default());
3127 let handle_2b = handle_2.clone();
3128 let handle_3 = app.add_model(|_| Model);
3129
3130 handle_1.update(app, |_, c| {
3131 c.subscribe_to_view(&handle_2, move |me, _, event, c| {
3132 me.events.push(*event);
3133
3134 c.subscribe_to_view(&handle_2b, |me, _, event, _| {
3135 me.events.push(*event * 2);
3136 });
3137 });
3138
3139 c.subscribe_to_model(&handle_3, |me, _, event, _| {
3140 me.events.push(*event);
3141 })
3142 });
3143
3144 handle_2.update(app, |_, c| c.emit(7));
3145 assert_eq!(handle_1.read(app).events, vec![7]);
3146
3147 handle_2.update(app, |_, c| c.emit(5));
3148 assert_eq!(handle_1.read(app).events, vec![7, 10, 5]);
3149
3150 handle_3.update(app, |_, c| c.emit(9));
3151 assert_eq!(handle_1.read(app).events, vec![7, 10, 5, 9]);
3152 })
3153 }
3154
3155 #[test]
3156 fn test_dropping_subscribers() {
3157 struct View;
3158
3159 impl Entity for View {
3160 type Event = ();
3161 }
3162
3163 impl super::View for View {
3164 fn render<'a>(&self, _: &AppContext) -> ElementBox {
3165 Empty::new().boxed()
3166 }
3167
3168 fn ui_name() -> &'static str {
3169 "View"
3170 }
3171 }
3172
3173 struct Model;
3174
3175 impl Entity for Model {
3176 type Event = ();
3177 }
3178
3179 App::test((), |app| {
3180 let (window_id, _) = app.add_window(|_| View);
3181 let observing_view = app.add_view(window_id, |_| View);
3182 let emitting_view = app.add_view(window_id, |_| View);
3183 let observing_model = app.add_model(|_| Model);
3184 let observed_model = app.add_model(|_| Model);
3185
3186 observing_view.update(app, |_, ctx| {
3187 ctx.subscribe_to_view(&emitting_view, |_, _, _, _| {});
3188 ctx.subscribe_to_model(&observed_model, |_, _, _, _| {});
3189 });
3190 observing_model.update(app, |_, ctx| {
3191 ctx.subscribe(&observed_model, |_, _, _| {});
3192 });
3193
3194 app.update(|| {
3195 drop(observing_view);
3196 drop(observing_model);
3197 });
3198
3199 emitting_view.update(app, |_, ctx| ctx.emit(()));
3200 observed_model.update(app, |_, ctx| ctx.emit(()));
3201 })
3202 }
3203
3204 #[test]
3205 fn test_observe_and_notify_from_view() {
3206 #[derive(Default)]
3207 struct View {
3208 events: Vec<usize>,
3209 }
3210
3211 impl Entity for View {
3212 type Event = usize;
3213 }
3214
3215 impl super::View for View {
3216 fn render<'a>(&self, _: &AppContext) -> ElementBox {
3217 Empty::new().boxed()
3218 }
3219
3220 fn ui_name() -> &'static str {
3221 "View"
3222 }
3223 }
3224
3225 #[derive(Default)]
3226 struct Model {
3227 count: usize,
3228 }
3229
3230 impl Entity for Model {
3231 type Event = ();
3232 }
3233
3234 App::test((), |app| {
3235 let (_, view) = app.add_window(|_| View::default());
3236 let model = app.add_model(|_| Model::default());
3237
3238 view.update(app, |_, c| {
3239 c.observe_model(&model, |me, observed, c| {
3240 me.events.push(observed.read(c).count)
3241 });
3242 });
3243
3244 model.update(app, |model, c| {
3245 model.count = 11;
3246 c.notify();
3247 });
3248 assert_eq!(view.read(app).events, vec![11]);
3249 })
3250 }
3251
3252 #[test]
3253 fn test_dropping_observers() {
3254 struct View;
3255
3256 impl Entity for View {
3257 type Event = ();
3258 }
3259
3260 impl super::View for View {
3261 fn render<'a>(&self, _: &AppContext) -> ElementBox {
3262 Empty::new().boxed()
3263 }
3264
3265 fn ui_name() -> &'static str {
3266 "View"
3267 }
3268 }
3269
3270 struct Model;
3271
3272 impl Entity for Model {
3273 type Event = ();
3274 }
3275
3276 App::test((), |app| {
3277 let (window_id, _) = app.add_window(|_| View);
3278 let observing_view = app.add_view(window_id, |_| View);
3279 let observing_model = app.add_model(|_| Model);
3280 let observed_model = app.add_model(|_| Model);
3281
3282 observing_view.update(app, |_, ctx| {
3283 ctx.observe_model(&observed_model, |_, _, _| {});
3284 });
3285 observing_model.update(app, |_, ctx| {
3286 ctx.observe(&observed_model, |_, _, _| {});
3287 });
3288
3289 app.update(|| {
3290 drop(observing_view);
3291 drop(observing_model);
3292 });
3293
3294 observed_model.update(app, |_, ctx| ctx.notify());
3295 })
3296 }
3297
3298 #[test]
3299 fn test_focus() {
3300 struct View {
3301 name: String,
3302 events: Arc<Mutex<Vec<String>>>,
3303 }
3304
3305 impl Entity for View {
3306 type Event = ();
3307 }
3308
3309 impl super::View for View {
3310 fn render<'a>(&self, _: &AppContext) -> ElementBox {
3311 Empty::new().boxed()
3312 }
3313
3314 fn ui_name() -> &'static str {
3315 "View"
3316 }
3317
3318 fn on_focus(&mut self, _: &mut ViewContext<Self>) {
3319 self.events.lock().push(format!("{} focused", &self.name));
3320 }
3321
3322 fn on_blur(&mut self, _: &mut ViewContext<Self>) {
3323 self.events.lock().push(format!("{} blurred", &self.name));
3324 }
3325 }
3326
3327 App::test((), |app| {
3328 let events: Arc<Mutex<Vec<String>>> = Default::default();
3329 let (window_id, view_1) = app.add_window(|_| View {
3330 events: events.clone(),
3331 name: "view 1".to_string(),
3332 });
3333 let view_2 = app.add_view(window_id, |_| View {
3334 events: events.clone(),
3335 name: "view 2".to_string(),
3336 });
3337
3338 view_1.update(app, |_, ctx| ctx.focus(&view_2));
3339 view_1.update(app, |_, ctx| ctx.focus(&view_1));
3340 view_1.update(app, |_, ctx| ctx.focus(&view_2));
3341 view_1.update(app, |_, _| drop(view_2));
3342
3343 assert_eq!(
3344 *events.lock(),
3345 [
3346 "view 1 focused".to_string(),
3347 "view 1 blurred".to_string(),
3348 "view 2 focused".to_string(),
3349 "view 2 blurred".to_string(),
3350 "view 1 focused".to_string(),
3351 "view 1 blurred".to_string(),
3352 "view 2 focused".to_string(),
3353 "view 1 focused".to_string(),
3354 ],
3355 );
3356 })
3357 }
3358
3359 #[test]
3360 fn test_spawn_from_view() {
3361 #[derive(Default)]
3362 struct View {
3363 count: usize,
3364 }
3365
3366 impl Entity for View {
3367 type Event = ();
3368 }
3369
3370 impl super::View for View {
3371 fn render<'a>(&self, _: &AppContext) -> ElementBox {
3372 Empty::new().boxed()
3373 }
3374
3375 fn ui_name() -> &'static str {
3376 "View"
3377 }
3378 }
3379
3380 App::test_async((), |mut app| async move {
3381 let handle = app.add_window(|_| View::default()).1;
3382 handle
3383 .update(&mut app, |_, c| {
3384 c.spawn(async { 7 }, |me, output, _| {
3385 me.count = output;
3386 })
3387 })
3388 .await;
3389 app.read(|ctx| assert_eq!(handle.read(ctx).count, 7));
3390 handle
3391 .update(&mut app, |_, c| {
3392 c.spawn(async { 14 }, |me, output, _| {
3393 me.count = output;
3394 })
3395 })
3396 .await;
3397 app.read(|ctx| assert_eq!(handle.read(ctx).count, 14));
3398 });
3399 }
3400
3401 #[test]
3402 fn test_spawn_stream_local_from_view() {
3403 #[derive(Default)]
3404 struct View {
3405 events: Vec<Option<usize>>,
3406 }
3407
3408 impl Entity for View {
3409 type Event = ();
3410 }
3411
3412 impl super::View for View {
3413 fn render<'a>(&self, _: &AppContext) -> ElementBox {
3414 Empty::new().boxed()
3415 }
3416
3417 fn ui_name() -> &'static str {
3418 "View"
3419 }
3420 }
3421
3422 App::test_async((), |mut app| async move {
3423 let (_, handle) = app.add_window(|_| View::default());
3424 handle
3425 .update(&mut app, |_, c| {
3426 c.spawn_stream(
3427 smol::stream::iter(vec![1_usize, 2, 3]),
3428 |me, output, _| {
3429 me.events.push(Some(output));
3430 },
3431 |me, _| {
3432 me.events.push(None);
3433 },
3434 )
3435 })
3436 .await;
3437
3438 app.read(|ctx| assert_eq!(handle.read(ctx).events, [Some(1), Some(2), Some(3), None]))
3439 });
3440 }
3441
3442 #[test]
3443 fn test_dispatch_action() {
3444 struct ViewA {
3445 id: usize,
3446 }
3447
3448 impl Entity for ViewA {
3449 type Event = ();
3450 }
3451
3452 impl View for ViewA {
3453 fn render<'a>(&self, _: &AppContext) -> ElementBox {
3454 Empty::new().boxed()
3455 }
3456
3457 fn ui_name() -> &'static str {
3458 "View"
3459 }
3460 }
3461
3462 struct ViewB {
3463 id: usize,
3464 }
3465
3466 impl Entity for ViewB {
3467 type Event = ();
3468 }
3469
3470 impl View for ViewB {
3471 fn render<'a>(&self, _: &AppContext) -> ElementBox {
3472 Empty::new().boxed()
3473 }
3474
3475 fn ui_name() -> &'static str {
3476 "View"
3477 }
3478 }
3479
3480 struct ActionArg {
3481 foo: String,
3482 }
3483
3484 App::test((), |app| {
3485 let actions = Rc::new(RefCell::new(Vec::new()));
3486
3487 let actions_clone = actions.clone();
3488 app.add_global_action("action", move |_: &ActionArg, _: &mut MutableAppContext| {
3489 actions_clone.borrow_mut().push("global a".to_string());
3490 });
3491
3492 let actions_clone = actions.clone();
3493 app.add_global_action("action", move |_: &ActionArg, _: &mut MutableAppContext| {
3494 actions_clone.borrow_mut().push("global b".to_string());
3495 });
3496
3497 let actions_clone = actions.clone();
3498 app.add_action("action", move |view: &mut ViewA, arg: &ActionArg, ctx| {
3499 assert_eq!(arg.foo, "bar");
3500 ctx.propagate_action();
3501 actions_clone.borrow_mut().push(format!("{} a", view.id));
3502 });
3503
3504 let actions_clone = actions.clone();
3505 app.add_action("action", move |view: &mut ViewA, _: &ActionArg, ctx| {
3506 if view.id != 1 {
3507 ctx.propagate_action();
3508 }
3509 actions_clone.borrow_mut().push(format!("{} b", view.id));
3510 });
3511
3512 let actions_clone = actions.clone();
3513 app.add_action("action", move |view: &mut ViewB, _: &ActionArg, ctx| {
3514 ctx.propagate_action();
3515 actions_clone.borrow_mut().push(format!("{} c", view.id));
3516 });
3517
3518 let actions_clone = actions.clone();
3519 app.add_action("action", move |view: &mut ViewB, _: &ActionArg, ctx| {
3520 ctx.propagate_action();
3521 actions_clone.borrow_mut().push(format!("{} d", view.id));
3522 });
3523
3524 let (window_id, view_1) = app.add_window(|_| ViewA { id: 1 });
3525 let view_2 = app.add_view(window_id, |_| ViewB { id: 2 });
3526 let view_3 = app.add_view(window_id, |_| ViewA { id: 3 });
3527 let view_4 = app.add_view(window_id, |_| ViewB { id: 4 });
3528
3529 app.dispatch_action(
3530 window_id,
3531 vec![view_1.id(), view_2.id(), view_3.id(), view_4.id()],
3532 "action",
3533 ActionArg { foo: "bar".into() },
3534 );
3535
3536 assert_eq!(
3537 *actions.borrow(),
3538 vec!["4 d", "4 c", "3 b", "3 a", "2 d", "2 c", "1 b"]
3539 );
3540
3541 // Remove view_1, which doesn't propagate the action
3542 actions.borrow_mut().clear();
3543 app.dispatch_action(
3544 window_id,
3545 vec![view_2.id(), view_3.id(), view_4.id()],
3546 "action",
3547 ActionArg { foo: "bar".into() },
3548 );
3549
3550 assert_eq!(
3551 *actions.borrow(),
3552 vec!["4 d", "4 c", "3 b", "3 a", "2 d", "2 c", "global b", "global a"]
3553 );
3554 })
3555 }
3556
3557 #[test]
3558 fn test_dispatch_keystroke() {
3559 use std::cell::Cell;
3560
3561 #[derive(Clone)]
3562 struct ActionArg {
3563 key: String,
3564 }
3565
3566 struct View {
3567 id: usize,
3568 keymap_context: keymap::Context,
3569 }
3570
3571 impl Entity for View {
3572 type Event = ();
3573 }
3574
3575 impl super::View for View {
3576 fn render<'a>(&self, _: &AppContext) -> ElementBox {
3577 Empty::new().boxed()
3578 }
3579
3580 fn ui_name() -> &'static str {
3581 "View"
3582 }
3583
3584 fn keymap_context(&self, _: &AppContext) -> keymap::Context {
3585 self.keymap_context.clone()
3586 }
3587 }
3588
3589 impl View {
3590 fn new(id: usize) -> Self {
3591 View {
3592 id,
3593 keymap_context: keymap::Context::default(),
3594 }
3595 }
3596 }
3597
3598 App::test((), |app| {
3599 let mut view_1 = View::new(1);
3600 let mut view_2 = View::new(2);
3601 let mut view_3 = View::new(3);
3602 view_1.keymap_context.set.insert("a".into());
3603 view_2.keymap_context.set.insert("b".into());
3604 view_3.keymap_context.set.insert("c".into());
3605
3606 let (window_id, view_1) = app.add_window(|_| view_1);
3607 let view_2 = app.add_view(window_id, |_| view_2);
3608 let view_3 = app.add_view(window_id, |_| view_3);
3609
3610 // This keymap's only binding dispatches an action on view 2 because that view will have
3611 // "a" and "b" in its context, but not "c".
3612 let binding = keymap::Binding::new("a", "action", Some("a && b && !c"))
3613 .with_arg(ActionArg { key: "a".into() });
3614 app.add_bindings(vec![binding]);
3615
3616 let handled_action = Rc::new(Cell::new(false));
3617 let handled_action_clone = handled_action.clone();
3618 app.add_action("action", move |view: &mut View, arg: &ActionArg, _ctx| {
3619 handled_action_clone.set(true);
3620 assert_eq!(view.id, 2);
3621 assert_eq!(arg.key, "a");
3622 });
3623
3624 app.dispatch_keystroke(
3625 window_id,
3626 vec![view_1.id(), view_2.id(), view_3.id()],
3627 &Keystroke::parse("a").unwrap(),
3628 )
3629 .unwrap();
3630
3631 assert!(handled_action.get());
3632 });
3633 }
3634
3635 #[test]
3636 fn test_model_condition() {
3637 struct Counter(usize);
3638
3639 impl super::Entity for Counter {
3640 type Event = ();
3641 }
3642
3643 impl Counter {
3644 fn inc(&mut self, ctx: &mut ModelContext<Self>) {
3645 self.0 += 1;
3646 ctx.notify();
3647 }
3648 }
3649
3650 App::test_async((), |mut app| async move {
3651 let model = app.add_model(|_| Counter(0));
3652
3653 let condition1 = model.condition(&app, |model, _| model.0 == 2);
3654 let condition2 = model.condition(&app, |model, _| model.0 == 3);
3655 smol::pin!(condition1, condition2);
3656
3657 model.update(&mut app, |model, ctx| model.inc(ctx));
3658 assert_eq!(poll_once(&mut condition1).await, None);
3659 assert_eq!(poll_once(&mut condition2).await, None);
3660
3661 model.update(&mut app, |model, ctx| model.inc(ctx));
3662 assert_eq!(poll_once(&mut condition1).await, Some(()));
3663 assert_eq!(poll_once(&mut condition2).await, None);
3664
3665 model.update(&mut app, |model, ctx| model.inc(ctx));
3666 assert_eq!(poll_once(&mut condition2).await, Some(()));
3667
3668 model.update(&mut app, |_, ctx| ctx.notify());
3669 });
3670 }
3671
3672 #[test]
3673 #[should_panic]
3674 fn test_model_condition_timeout() {
3675 struct Model;
3676
3677 impl super::Entity for Model {
3678 type Event = ();
3679 }
3680
3681 App::test_async((), |mut app| async move {
3682 let model = app.add_model(|_| Model);
3683 model.condition(&app, |_, _| false).await;
3684 });
3685 }
3686
3687 #[test]
3688 #[should_panic(expected = "model dropped with pending condition")]
3689 fn test_model_condition_panic_on_drop() {
3690 struct Model;
3691
3692 impl super::Entity for Model {
3693 type Event = ();
3694 }
3695
3696 App::test_async((), |mut app| async move {
3697 let model = app.add_model(|_| Model);
3698 let condition = model.condition(&app, |_, _| false);
3699 app.update(|_| drop(model));
3700 condition.await;
3701 });
3702 }
3703
3704 #[test]
3705 fn test_view_condition() {
3706 struct Counter(usize);
3707
3708 impl super::Entity for Counter {
3709 type Event = ();
3710 }
3711
3712 impl super::View for Counter {
3713 fn ui_name() -> &'static str {
3714 "test view"
3715 }
3716
3717 fn render(&self, _: &AppContext) -> ElementBox {
3718 Empty::new().boxed()
3719 }
3720 }
3721
3722 impl Counter {
3723 fn inc(&mut self, ctx: &mut ViewContext<Self>) {
3724 self.0 += 1;
3725 ctx.notify();
3726 }
3727 }
3728
3729 App::test_async((), |mut app| async move {
3730 let (_, view) = app.add_window(|_| Counter(0));
3731
3732 let condition1 = view.condition(&app, |view, _| view.0 == 2);
3733 let condition2 = view.condition(&app, |view, _| view.0 == 3);
3734 smol::pin!(condition1, condition2);
3735
3736 view.update(&mut app, |view, ctx| view.inc(ctx));
3737 assert_eq!(poll_once(&mut condition1).await, None);
3738 assert_eq!(poll_once(&mut condition2).await, None);
3739
3740 view.update(&mut app, |view, ctx| view.inc(ctx));
3741 assert_eq!(poll_once(&mut condition1).await, Some(()));
3742 assert_eq!(poll_once(&mut condition2).await, None);
3743
3744 view.update(&mut app, |view, ctx| view.inc(ctx));
3745 assert_eq!(poll_once(&mut condition2).await, Some(()));
3746 view.update(&mut app, |_, ctx| ctx.notify());
3747 });
3748 }
3749
3750 #[test]
3751 #[should_panic]
3752 fn test_view_condition_timeout() {
3753 struct View;
3754
3755 impl super::Entity for View {
3756 type Event = ();
3757 }
3758
3759 impl super::View for View {
3760 fn ui_name() -> &'static str {
3761 "test view"
3762 }
3763
3764 fn render(&self, _: &AppContext) -> ElementBox {
3765 Empty::new().boxed()
3766 }
3767 }
3768
3769 App::test_async((), |mut app| async move {
3770 let (_, view) = app.add_window(|_| View);
3771 view.condition(&app, |_, _| false).await;
3772 });
3773 }
3774
3775 #[test]
3776 #[should_panic(expected = "view dropped with pending condition")]
3777 fn test_view_condition_panic_on_drop() {
3778 struct View;
3779
3780 impl super::Entity for View {
3781 type Event = ();
3782 }
3783
3784 impl super::View for View {
3785 fn ui_name() -> &'static str {
3786 "test view"
3787 }
3788
3789 fn render(&self, _: &AppContext) -> ElementBox {
3790 Empty::new().boxed()
3791 }
3792 }
3793
3794 App::test_async((), |mut app| async move {
3795 let window_id = app.add_window(|_| View).0;
3796 let view = app.add_view(window_id, |_| View);
3797
3798 let condition = view.condition(&app, |_, _| false);
3799 app.update(|_| drop(view));
3800 condition.await;
3801 });
3802 }
3803
3804 // #[test]
3805 // fn test_ui_and_window_updates() {
3806 // struct View {
3807 // count: usize,
3808 // }
3809
3810 // impl Entity for View {
3811 // type Event = ();
3812 // }
3813
3814 // impl super::View for View {
3815 // fn render<'a>(&self, _: &AppContext) -> ElementBox {
3816 // Empty::new().boxed()
3817 // }
3818
3819 // fn ui_name() -> &'static str {
3820 // "View"
3821 // }
3822 // }
3823
3824 // App::test(|app| async move {
3825 // let (window_id, _) = app.add_window(|_| View { count: 3 });
3826 // let view_1 = app.add_view(window_id, |_| View { count: 1 });
3827 // let view_2 = app.add_view(window_id, |_| View { count: 2 });
3828
3829 // // Ensure that registering for UI updates after mutating the app still gives us all the
3830 // // updates.
3831 // let ui_updates = Rc::new(RefCell::new(Vec::new()));
3832 // let ui_updates_ = ui_updates.clone();
3833 // app.on_ui_update(move |update, _| ui_updates_.borrow_mut().push(update));
3834
3835 // assert_eq!(
3836 // ui_updates.borrow_mut().drain(..).collect::<Vec<_>>(),
3837 // vec![UiUpdate::OpenWindow {
3838 // window_id,
3839 // width: 1024.0,
3840 // height: 768.0,
3841 // }]
3842 // );
3843
3844 // let window_invalidations = Rc::new(RefCell::new(Vec::new()));
3845 // let window_invalidations_ = window_invalidations.clone();
3846 // app.on_window_invalidated(window_id, move |update, _| {
3847 // window_invalidations_.borrow_mut().push(update)
3848 // });
3849
3850 // let view_2_id = view_2.id();
3851 // view_1.update(app, |view, ctx| {
3852 // view.count = 7;
3853 // ctx.notify();
3854 // drop(view_2);
3855 // });
3856
3857 // let invalidation = window_invalidations.borrow_mut().drain(..).next().unwrap();
3858 // assert_eq!(invalidation.updated.len(), 1);
3859 // assert!(invalidation.updated.contains(&view_1.id()));
3860 // assert_eq!(invalidation.removed, vec![view_2_id]);
3861
3862 // let view_3 = view_1.update(app, |_, ctx| ctx.add_view(|_| View { count: 8 }));
3863
3864 // let invalidation = window_invalidations.borrow_mut().drain(..).next().unwrap();
3865 // assert_eq!(invalidation.updated.len(), 1);
3866 // assert!(invalidation.updated.contains(&view_3.id()));
3867 // assert!(invalidation.removed.is_empty());
3868
3869 // view_3
3870 // .update(app, |_, ctx| {
3871 // ctx.spawn_local(async { 9 }, |me, output, ctx| {
3872 // me.count = output;
3873 // ctx.notify();
3874 // })
3875 // })
3876 // .await;
3877
3878 // let invalidation = window_invalidations.borrow_mut().drain(..).next().unwrap();
3879 // assert_eq!(invalidation.updated.len(), 1);
3880 // assert!(invalidation.updated.contains(&view_3.id()));
3881 // assert!(invalidation.removed.is_empty());
3882 // });
3883 // }
3884}