833 lines
26 KiB
Rust
833 lines
26 KiB
Rust
mod async_context;
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mod entity_map;
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mod model_context;
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pub use async_context::*;
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pub use entity_map::*;
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pub use model_context::*;
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use refineable::Refineable;
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use smallvec::SmallVec;
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use crate::{
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current_platform, image_cache::ImageCache, Action, AnyBox, AnyView, AppMetadata, AssetSource,
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ClipboardItem, Context, DispatchPhase, DisplayId, Executor, FocusEvent, FocusHandle, FocusId,
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KeyBinding, Keymap, LayoutId, MainThread, MainThreadOnly, Pixels, Platform, Point,
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SharedString, SubscriberSet, Subscription, SvgRenderer, Task, TextStyle, TextStyleRefinement,
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TextSystem, View, Window, WindowContext, WindowHandle, WindowId,
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};
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use anyhow::{anyhow, Result};
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use collections::{HashMap, HashSet, VecDeque};
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use futures::{future::BoxFuture, Future};
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use parking_lot::{Mutex, RwLock};
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use slotmap::SlotMap;
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use std::{
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any::{type_name, Any, TypeId},
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borrow::Borrow,
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marker::PhantomData,
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mem,
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ops::{Deref, DerefMut},
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sync::{atomic::Ordering::SeqCst, Arc, Weak},
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time::Duration,
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};
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use util::http::{self, HttpClient};
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pub struct App(Arc<Mutex<AppContext>>);
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impl App {
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pub fn production(asset_source: Arc<dyn AssetSource>) -> Self {
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let http_client = http::client();
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Self::new(current_platform(), asset_source, http_client)
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}
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#[cfg(any(test, feature = "test"))]
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pub fn test() -> Self {
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let platform = Arc::new(super::TestPlatform::new());
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let asset_source = Arc::new(());
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let http_client = util::http::FakeHttpClient::with_404_response();
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Self::new(platform, asset_source, http_client)
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}
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fn new(
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platform: Arc<dyn Platform>,
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asset_source: Arc<dyn AssetSource>,
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http_client: Arc<dyn HttpClient>,
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) -> Self {
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let executor = platform.executor();
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assert!(
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executor.is_main_thread(),
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"must construct App on main thread"
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);
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let text_system = Arc::new(TextSystem::new(platform.text_system()));
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let mut entities = EntityMap::new();
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let unit_entity = entities.insert(entities.reserve(), ());
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let app_metadata = AppMetadata {
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os_name: platform.os_name(),
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os_version: platform.os_version().ok(),
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app_version: platform.app_version().ok(),
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};
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Self(Arc::new_cyclic(|this| {
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Mutex::new(AppContext {
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this: this.clone(),
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text_system,
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platform: MainThreadOnly::new(platform, executor.clone()),
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app_metadata,
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flushing_effects: false,
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pending_updates: 0,
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next_frame_callbacks: Default::default(),
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executor,
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svg_renderer: SvgRenderer::new(asset_source),
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image_cache: ImageCache::new(http_client),
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text_style_stack: Vec::new(),
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globals_by_type: HashMap::default(),
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unit_entity,
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entities,
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windows: SlotMap::with_key(),
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keymap: Arc::new(RwLock::new(Keymap::default())),
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global_action_listeners: HashMap::default(),
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action_builders: HashMap::default(),
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pending_effects: VecDeque::new(),
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pending_notifications: HashSet::default(),
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pending_global_notifications: HashSet::default(),
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observers: SubscriberSet::new(),
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event_listeners: SubscriberSet::new(),
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release_listeners: SubscriberSet::new(),
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global_observers: SubscriberSet::new(),
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quit_observers: SubscriberSet::new(),
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layout_id_buffer: Default::default(),
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propagate_event: true,
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active_drag: None,
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})
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}))
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}
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pub fn run<F>(self, on_finish_launching: F)
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where
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F: 'static + FnOnce(&mut MainThread<AppContext>),
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{
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let this = self.0.clone();
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let platform = self.0.lock().platform.clone();
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platform.borrow_on_main_thread().run(Box::new(move || {
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let cx = &mut *this.lock();
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let cx = unsafe { mem::transmute::<&mut AppContext, &mut MainThread<AppContext>>(cx) };
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on_finish_launching(cx);
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}));
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}
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pub fn on_open_urls<F>(&self, mut callback: F) -> &Self
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where
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F: 'static + FnMut(Vec<String>, &mut AppContext),
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{
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let this = Arc::downgrade(&self.0);
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self.0
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.lock()
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.platform
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.borrow_on_main_thread()
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.on_open_urls(Box::new(move |urls| {
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if let Some(app) = this.upgrade() {
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callback(urls, &mut app.lock());
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}
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}));
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self
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}
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pub fn on_reopen<F>(&self, mut callback: F) -> &Self
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where
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F: 'static + FnMut(&mut AppContext),
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{
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let this = Arc::downgrade(&self.0);
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self.0
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.lock()
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.platform
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.borrow_on_main_thread()
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.on_reopen(Box::new(move || {
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if let Some(app) = this.upgrade() {
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callback(&mut app.lock());
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}
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}));
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self
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}
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pub fn metadata(&self) -> AppMetadata {
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self.0.lock().app_metadata.clone()
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}
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pub fn executor(&self) -> Executor {
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self.0.lock().executor.clone()
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}
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pub fn text_system(&self) -> Arc<TextSystem> {
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self.0.lock().text_system.clone()
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}
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}
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type ActionBuilder = fn(json: Option<serde_json::Value>) -> anyhow::Result<Box<dyn Action>>;
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type FrameCallback = Box<dyn FnOnce(&mut WindowContext) + Send>;
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type Handler = Box<dyn FnMut(&mut AppContext) -> bool + Send + Sync + 'static>;
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type Listener = Box<dyn FnMut(&dyn Any, &mut AppContext) -> bool + Send + Sync + 'static>;
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type QuitHandler =
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Box<dyn FnMut(&mut AppContext) -> BoxFuture<'static, ()> + Send + Sync + 'static>;
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type ReleaseListener = Box<dyn FnMut(&mut dyn Any, &mut AppContext) + Send + Sync + 'static>;
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pub struct AppContext {
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this: Weak<Mutex<AppContext>>,
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pub(crate) platform: MainThreadOnly<dyn Platform>,
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app_metadata: AppMetadata,
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text_system: Arc<TextSystem>,
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flushing_effects: bool,
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pending_updates: usize,
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pub(crate) active_drag: Option<AnyDrag>,
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pub(crate) next_frame_callbacks: HashMap<DisplayId, Vec<FrameCallback>>,
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pub(crate) executor: Executor,
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pub(crate) svg_renderer: SvgRenderer,
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pub(crate) image_cache: ImageCache,
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pub(crate) text_style_stack: Vec<TextStyleRefinement>,
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pub(crate) globals_by_type: HashMap<TypeId, AnyBox>,
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pub(crate) unit_entity: Handle<()>,
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pub(crate) entities: EntityMap,
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pub(crate) windows: SlotMap<WindowId, Option<Window>>,
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pub(crate) keymap: Arc<RwLock<Keymap>>,
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pub(crate) global_action_listeners:
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HashMap<TypeId, Vec<Box<dyn Fn(&dyn Action, DispatchPhase, &mut Self) + Send + Sync>>>,
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action_builders: HashMap<SharedString, ActionBuilder>,
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pending_effects: VecDeque<Effect>,
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pub(crate) pending_notifications: HashSet<EntityId>,
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pub(crate) pending_global_notifications: HashSet<TypeId>,
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pub(crate) observers: SubscriberSet<EntityId, Handler>,
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pub(crate) event_listeners: SubscriberSet<EntityId, Listener>,
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pub(crate) release_listeners: SubscriberSet<EntityId, ReleaseListener>,
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pub(crate) global_observers: SubscriberSet<TypeId, Handler>,
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pub(crate) quit_observers: SubscriberSet<(), QuitHandler>,
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pub(crate) layout_id_buffer: Vec<LayoutId>, // We recycle this memory across layout requests.
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pub(crate) propagate_event: bool,
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}
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impl AppContext {
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pub fn quit(&mut self) {
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let mut futures = Vec::new();
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self.quit_observers.clone().retain(&(), |observer| {
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futures.push(observer(self));
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true
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});
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self.windows.clear();
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self.flush_effects();
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let futures = futures::future::join_all(futures);
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if self
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.executor
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.block_with_timeout(Duration::from_millis(100), futures)
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.is_err()
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{
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log::error!("timed out waiting on app_will_quit");
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}
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}
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pub fn app_metadata(&self) -> AppMetadata {
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self.app_metadata.clone()
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}
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pub fn refresh(&mut self) {
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self.pending_effects.push_back(Effect::Refresh);
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}
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pub(crate) fn update<R>(&mut self, update: impl FnOnce(&mut Self) -> R) -> R {
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self.pending_updates += 1;
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let result = update(self);
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if !self.flushing_effects && self.pending_updates == 1 {
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self.flushing_effects = true;
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self.flush_effects();
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self.flushing_effects = false;
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}
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self.pending_updates -= 1;
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result
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}
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pub(crate) fn read_window<R>(
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&mut self,
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id: WindowId,
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read: impl FnOnce(&WindowContext) -> R,
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) -> Result<R> {
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let window = self
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.windows
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.get(id)
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.ok_or_else(|| anyhow!("window not found"))?
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.as_ref()
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.unwrap();
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Ok(read(&WindowContext::immutable(self, &window)))
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}
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pub(crate) fn update_window<R>(
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&mut self,
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id: WindowId,
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update: impl FnOnce(&mut WindowContext) -> R,
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) -> Result<R> {
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self.update(|cx| {
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let mut window = cx
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.windows
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.get_mut(id)
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.ok_or_else(|| anyhow!("window not found"))?
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.take()
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.unwrap();
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let result = update(&mut WindowContext::mutable(cx, &mut window));
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cx.windows
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.get_mut(id)
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.ok_or_else(|| anyhow!("window not found"))?
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.replace(window);
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Ok(result)
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})
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}
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pub(crate) fn push_effect(&mut self, effect: Effect) {
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match &effect {
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Effect::Notify { emitter } => {
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if !self.pending_notifications.insert(*emitter) {
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return;
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}
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}
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Effect::NotifyGlobalObservers { global_type } => {
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if !self.pending_global_notifications.insert(*global_type) {
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return;
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}
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}
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_ => {}
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};
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self.pending_effects.push_back(effect);
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}
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fn flush_effects(&mut self) {
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loop {
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self.release_dropped_entities();
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self.release_dropped_focus_handles();
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if let Some(effect) = self.pending_effects.pop_front() {
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match effect {
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Effect::Notify { emitter } => {
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self.apply_notify_effect(emitter);
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}
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Effect::Emit { emitter, event } => self.apply_emit_effect(emitter, event),
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Effect::FocusChanged { window_id, focused } => {
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self.apply_focus_changed_effect(window_id, focused);
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}
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Effect::Refresh => {
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self.apply_refresh_effect();
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}
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Effect::NotifyGlobalObservers { global_type } => {
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self.apply_notify_global_observers_effect(global_type);
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}
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Effect::Defer { callback } => {
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self.apply_defer_effect(callback);
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}
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}
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} else {
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break;
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}
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}
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let dirty_window_ids = self
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.windows
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.iter()
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.filter_map(|(window_id, window)| {
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let window = window.as_ref().unwrap();
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if window.dirty {
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Some(window_id)
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} else {
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None
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}
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})
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.collect::<SmallVec<[_; 8]>>();
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for dirty_window_id in dirty_window_ids {
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self.update_window(dirty_window_id, |cx| cx.draw()).unwrap();
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}
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}
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fn release_dropped_entities(&mut self) {
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loop {
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let dropped = self.entities.take_dropped();
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if dropped.is_empty() {
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break;
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}
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for (entity_id, mut entity) in dropped {
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self.observers.remove(&entity_id);
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self.event_listeners.remove(&entity_id);
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for mut release_callback in self.release_listeners.remove(&entity_id) {
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release_callback(&mut entity, self);
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}
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}
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}
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}
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fn release_dropped_focus_handles(&mut self) {
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let window_ids = self.windows.keys().collect::<SmallVec<[_; 8]>>();
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for window_id in window_ids {
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self.update_window(window_id, |cx| {
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let mut blur_window = false;
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let focus = cx.window.focus;
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cx.window.focus_handles.write().retain(|handle_id, count| {
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if count.load(SeqCst) == 0 {
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if focus == Some(handle_id) {
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blur_window = true;
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}
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false
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} else {
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true
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}
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});
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if blur_window {
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cx.blur();
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}
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})
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.unwrap();
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}
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}
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fn apply_notify_effect(&mut self, emitter: EntityId) {
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self.pending_notifications.remove(&emitter);
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self.observers
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.clone()
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.retain(&emitter, |handler| handler(self));
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}
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fn apply_emit_effect(&mut self, emitter: EntityId, event: Box<dyn Any>) {
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self.event_listeners
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.clone()
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.retain(&emitter, |handler| handler(&event, self));
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}
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fn apply_focus_changed_effect(&mut self, window_id: WindowId, focused: Option<FocusId>) {
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self.update_window(window_id, |cx| {
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if cx.window.focus == focused {
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let mut listeners = mem::take(&mut cx.window.focus_listeners);
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let focused =
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focused.map(|id| FocusHandle::for_id(id, &cx.window.focus_handles).unwrap());
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let blurred = cx
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.window
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.last_blur
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.take()
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.unwrap()
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.and_then(|id| FocusHandle::for_id(id, &cx.window.focus_handles));
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if focused.is_some() || blurred.is_some() {
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let event = FocusEvent { focused, blurred };
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for listener in &listeners {
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listener(&event, cx);
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}
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}
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listeners.extend(cx.window.focus_listeners.drain(..));
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cx.window.focus_listeners = listeners;
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}
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})
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.ok();
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}
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fn apply_refresh_effect(&mut self) {
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for window in self.windows.values_mut() {
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if let Some(window) = window.as_mut() {
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window.dirty = true;
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}
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}
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}
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fn apply_notify_global_observers_effect(&mut self, type_id: TypeId) {
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self.pending_global_notifications.remove(&type_id);
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self.global_observers
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.clone()
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.retain(&type_id, |observer| observer(self));
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}
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fn apply_defer_effect(&mut self, callback: Box<dyn FnOnce(&mut Self) + Send + Sync + 'static>) {
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callback(self);
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}
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pub fn to_async(&self) -> AsyncAppContext {
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AsyncAppContext {
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app: unsafe { mem::transmute(self.this.clone()) },
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executor: self.executor.clone(),
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}
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}
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pub fn executor(&self) -> &Executor {
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&self.executor
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}
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pub fn run_on_main<R>(
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&mut self,
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f: impl FnOnce(&mut MainThread<AppContext>) -> R + Send + 'static,
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) -> Task<R>
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where
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R: Send + 'static,
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{
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if self.executor.is_main_thread() {
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Task::ready(f(unsafe {
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mem::transmute::<&mut AppContext, &mut MainThread<AppContext>>(self)
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}))
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} else {
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let this = self.this.upgrade().unwrap();
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self.executor.run_on_main(move || {
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let cx = &mut *this.lock();
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cx.update(|cx| f(unsafe { mem::transmute::<&mut Self, &mut MainThread<Self>>(cx) }))
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})
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}
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}
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pub fn spawn_on_main<F, R>(
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&self,
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f: impl FnOnce(MainThread<AsyncAppContext>) -> F + Send + 'static,
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) -> Task<R>
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where
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F: Future<Output = R> + 'static,
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R: Send + 'static,
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{
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let cx = self.to_async();
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self.executor.spawn_on_main(move || f(MainThread(cx)))
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}
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pub fn spawn<Fut, R>(&self, f: impl FnOnce(AsyncAppContext) -> Fut + Send + 'static) -> Task<R>
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where
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Fut: Future<Output = R> + Send + 'static,
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R: Send + 'static,
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{
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let cx = self.to_async();
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self.executor.spawn(async move {
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let future = f(cx);
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future.await
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})
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}
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|
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pub fn defer(&mut self, f: impl FnOnce(&mut AppContext) + 'static + Send + Sync) {
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self.push_effect(Effect::Defer {
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callback: Box::new(f),
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});
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}
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pub fn text_system(&self) -> &Arc<TextSystem> {
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&self.text_system
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}
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|
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pub fn text_style(&self) -> TextStyle {
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let mut style = TextStyle::default();
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for refinement in &self.text_style_stack {
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style.refine(refinement);
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}
|
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style
|
|
}
|
|
|
|
pub fn has_global<G: 'static>(&self) -> bool {
|
|
self.globals_by_type.contains_key(&TypeId::of::<G>())
|
|
}
|
|
|
|
pub fn global<G: 'static>(&self) -> &G {
|
|
self.globals_by_type
|
|
.get(&TypeId::of::<G>())
|
|
.map(|any_state| any_state.downcast_ref::<G>().unwrap())
|
|
.ok_or_else(|| anyhow!("no state of type {} exists", type_name::<G>()))
|
|
.unwrap()
|
|
}
|
|
|
|
pub fn try_global<G: 'static>(&self) -> Option<&G> {
|
|
self.globals_by_type
|
|
.get(&TypeId::of::<G>())
|
|
.map(|any_state| any_state.downcast_ref::<G>().unwrap())
|
|
}
|
|
|
|
pub fn global_mut<G: 'static>(&mut self) -> &mut G {
|
|
let global_type = TypeId::of::<G>();
|
|
self.push_effect(Effect::NotifyGlobalObservers { global_type });
|
|
self.globals_by_type
|
|
.get_mut(&global_type)
|
|
.and_then(|any_state| any_state.downcast_mut::<G>())
|
|
.ok_or_else(|| anyhow!("no state of type {} exists", type_name::<G>()))
|
|
.unwrap()
|
|
}
|
|
|
|
pub fn default_global_mut<G: 'static + Default + Sync + Send>(&mut self) -> &mut G {
|
|
let global_type = TypeId::of::<G>();
|
|
self.push_effect(Effect::NotifyGlobalObservers { global_type });
|
|
self.globals_by_type
|
|
.entry(global_type)
|
|
.or_insert_with(|| Box::new(G::default()))
|
|
.downcast_mut::<G>()
|
|
.unwrap()
|
|
}
|
|
|
|
pub fn set_global<G: Any + Send + Sync>(&mut self, global: G) {
|
|
let global_type = TypeId::of::<G>();
|
|
self.push_effect(Effect::NotifyGlobalObservers { global_type });
|
|
self.globals_by_type.insert(global_type, Box::new(global));
|
|
}
|
|
|
|
pub fn update_global<G: 'static, R>(&mut self, f: impl FnOnce(&mut G, &mut Self) -> R) -> R {
|
|
let mut global = self.lease_global::<G>();
|
|
let result = f(&mut global, self);
|
|
self.end_global_lease(global);
|
|
result
|
|
}
|
|
|
|
pub fn observe_global<G: 'static>(
|
|
&mut self,
|
|
mut f: impl FnMut(&mut Self) + Send + Sync + 'static,
|
|
) -> Subscription {
|
|
self.global_observers.insert(
|
|
TypeId::of::<G>(),
|
|
Box::new(move |cx| {
|
|
f(cx);
|
|
true
|
|
}),
|
|
)
|
|
}
|
|
|
|
pub(crate) fn lease_global<G: 'static>(&mut self) -> GlobalLease<G> {
|
|
GlobalLease::new(
|
|
self.globals_by_type
|
|
.remove(&TypeId::of::<G>())
|
|
.ok_or_else(|| anyhow!("no global registered of type {}", type_name::<G>()))
|
|
.unwrap(),
|
|
)
|
|
}
|
|
|
|
pub(crate) fn end_global_lease<G: 'static>(&mut self, lease: GlobalLease<G>) {
|
|
let global_type = TypeId::of::<G>();
|
|
self.push_effect(Effect::NotifyGlobalObservers { global_type });
|
|
self.globals_by_type.insert(global_type, lease.global);
|
|
}
|
|
|
|
pub(crate) fn push_text_style(&mut self, text_style: TextStyleRefinement) {
|
|
self.text_style_stack.push(text_style);
|
|
}
|
|
|
|
pub(crate) fn pop_text_style(&mut self) {
|
|
self.text_style_stack.pop();
|
|
}
|
|
|
|
pub fn bind_keys(&mut self, bindings: impl IntoIterator<Item = KeyBinding>) {
|
|
self.keymap.write().add_bindings(bindings);
|
|
self.pending_effects.push_back(Effect::Refresh);
|
|
}
|
|
|
|
pub fn on_action<A: Action>(
|
|
&mut self,
|
|
listener: impl Fn(&A, &mut Self) + Send + Sync + 'static,
|
|
) {
|
|
self.global_action_listeners
|
|
.entry(TypeId::of::<A>())
|
|
.or_default()
|
|
.push(Box::new(move |action, phase, cx| {
|
|
if phase == DispatchPhase::Bubble {
|
|
let action = action.as_any().downcast_ref().unwrap();
|
|
listener(action, cx)
|
|
}
|
|
}));
|
|
}
|
|
|
|
pub fn register_action_type<A: Action>(&mut self) {
|
|
self.action_builders.insert(A::qualified_name(), A::build);
|
|
}
|
|
|
|
pub fn build_action(
|
|
&mut self,
|
|
name: &str,
|
|
params: Option<serde_json::Value>,
|
|
) -> Result<Box<dyn Action>> {
|
|
let build = self
|
|
.action_builders
|
|
.get(name)
|
|
.ok_or_else(|| anyhow!("no action type registered for {}", name))?;
|
|
(build)(params)
|
|
}
|
|
|
|
pub fn stop_propagation(&mut self) {
|
|
self.propagate_event = false;
|
|
}
|
|
}
|
|
|
|
impl Context for AppContext {
|
|
type EntityContext<'a, 'w, T> = ModelContext<'a, T>;
|
|
type Result<T> = T;
|
|
|
|
fn entity<T: Any + Send + Sync>(
|
|
&mut self,
|
|
build_entity: impl FnOnce(&mut Self::EntityContext<'_, '_, T>) -> T,
|
|
) -> Handle<T> {
|
|
self.update(|cx| {
|
|
let slot = cx.entities.reserve();
|
|
let entity = build_entity(&mut ModelContext::mutable(cx, slot.downgrade()));
|
|
cx.entities.insert(slot, entity)
|
|
})
|
|
}
|
|
|
|
fn update_entity<T: 'static, R>(
|
|
&mut self,
|
|
handle: &Handle<T>,
|
|
update: impl FnOnce(&mut T, &mut Self::EntityContext<'_, '_, T>) -> R,
|
|
) -> R {
|
|
self.update(|cx| {
|
|
let mut entity = cx.entities.lease(handle);
|
|
let result = update(
|
|
&mut entity,
|
|
&mut ModelContext::mutable(cx, handle.downgrade()),
|
|
);
|
|
cx.entities.end_lease(entity);
|
|
result
|
|
})
|
|
}
|
|
}
|
|
|
|
impl<C> MainThread<C>
|
|
where
|
|
C: Borrow<AppContext>,
|
|
{
|
|
pub(crate) fn platform(&self) -> &dyn Platform {
|
|
self.0.borrow().platform.borrow_on_main_thread()
|
|
}
|
|
|
|
pub fn activate(&self, ignoring_other_apps: bool) {
|
|
self.platform().activate(ignoring_other_apps);
|
|
}
|
|
|
|
pub fn write_to_clipboard(&self, item: ClipboardItem) {
|
|
self.platform().write_to_clipboard(item)
|
|
}
|
|
|
|
pub fn read_from_clipboard(&self) -> Option<ClipboardItem> {
|
|
self.platform().read_from_clipboard()
|
|
}
|
|
|
|
pub fn write_credentials(&self, url: &str, username: &str, password: &[u8]) -> Result<()> {
|
|
self.platform().write_credentials(url, username, password)
|
|
}
|
|
|
|
pub fn read_credentials(&self, url: &str) -> Result<Option<(String, Vec<u8>)>> {
|
|
self.platform().read_credentials(url)
|
|
}
|
|
|
|
pub fn delete_credentials(&self, url: &str) -> Result<()> {
|
|
self.platform().delete_credentials(url)
|
|
}
|
|
|
|
pub fn open_url(&self, url: &str) {
|
|
self.platform().open_url(url);
|
|
}
|
|
}
|
|
|
|
impl MainThread<AppContext> {
|
|
fn update<R>(&mut self, update: impl FnOnce(&mut Self) -> R) -> R {
|
|
self.0.update(|cx| {
|
|
update(unsafe {
|
|
std::mem::transmute::<&mut AppContext, &mut MainThread<AppContext>>(cx)
|
|
})
|
|
})
|
|
}
|
|
|
|
pub(crate) fn update_window<R>(
|
|
&mut self,
|
|
id: WindowId,
|
|
update: impl FnOnce(&mut MainThread<WindowContext>) -> R,
|
|
) -> Result<R> {
|
|
self.0.update_window(id, |cx| {
|
|
update(unsafe {
|
|
std::mem::transmute::<&mut WindowContext, &mut MainThread<WindowContext>>(cx)
|
|
})
|
|
})
|
|
}
|
|
|
|
pub fn open_window<V: 'static>(
|
|
&mut self,
|
|
options: crate::WindowOptions,
|
|
build_root_view: impl FnOnce(&mut WindowContext) -> View<V> + Send + 'static,
|
|
) -> WindowHandle<V> {
|
|
self.update(|cx| {
|
|
let id = cx.windows.insert(None);
|
|
let handle = WindowHandle::new(id);
|
|
let mut window = Window::new(handle.into(), options, cx);
|
|
let root_view = build_root_view(&mut WindowContext::mutable(cx, &mut window));
|
|
window.root_view.replace(root_view.into_any());
|
|
cx.windows.get_mut(id).unwrap().replace(window);
|
|
handle
|
|
})
|
|
}
|
|
|
|
pub fn update_global<G: 'static + Send + Sync, R>(
|
|
&mut self,
|
|
update: impl FnOnce(&mut G, &mut MainThread<AppContext>) -> R,
|
|
) -> R {
|
|
self.0.update_global(|global, cx| {
|
|
let cx = unsafe { mem::transmute::<&mut AppContext, &mut MainThread<AppContext>>(cx) };
|
|
update(global, cx)
|
|
})
|
|
}
|
|
}
|
|
|
|
pub(crate) enum Effect {
|
|
Notify {
|
|
emitter: EntityId,
|
|
},
|
|
Emit {
|
|
emitter: EntityId,
|
|
event: Box<dyn Any + Send + Sync + 'static>,
|
|
},
|
|
FocusChanged {
|
|
window_id: WindowId,
|
|
focused: Option<FocusId>,
|
|
},
|
|
Refresh,
|
|
NotifyGlobalObservers {
|
|
global_type: TypeId,
|
|
},
|
|
Defer {
|
|
callback: Box<dyn FnOnce(&mut AppContext) + Send + Sync + 'static>,
|
|
},
|
|
}
|
|
|
|
pub(crate) struct GlobalLease<G: 'static> {
|
|
global: AnyBox,
|
|
global_type: PhantomData<G>,
|
|
}
|
|
|
|
impl<G: 'static> GlobalLease<G> {
|
|
fn new(global: AnyBox) -> Self {
|
|
GlobalLease {
|
|
global,
|
|
global_type: PhantomData,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<G: 'static> Deref for GlobalLease<G> {
|
|
type Target = G;
|
|
|
|
fn deref(&self) -> &Self::Target {
|
|
self.global.downcast_ref().unwrap()
|
|
}
|
|
}
|
|
|
|
impl<G: 'static> DerefMut for GlobalLease<G> {
|
|
fn deref_mut(&mut self) -> &mut Self::Target {
|
|
self.global.downcast_mut().unwrap()
|
|
}
|
|
}
|
|
|
|
pub(crate) struct AnyDrag {
|
|
pub drag_handle_view: AnyView,
|
|
pub cursor_offset: Point<Pixels>,
|
|
pub state: AnyBox,
|
|
pub state_type: TypeId,
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::AppContext;
|
|
|
|
#[test]
|
|
fn test_app_context_send_sync() {
|
|
// This will not compile if `AppContext` does not implement `Send`
|
|
fn assert_send<T: Send>() {}
|
|
assert_send::<AppContext>();
|
|
}
|
|
}
|