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