3e8fa41073
The APIs are not well suited for the `&dyn ApplicationHandler` model and `Box<dyn EventLoop>` structure, thus remove them.
98 lines
3.6 KiB
Rust
98 lines
3.6 KiB
Rust
use std::marker::PhantomData;
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use std::sync::mpsc::{self, Receiver, Sender};
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use crate::application::ApplicationHandler;
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use crate::error::EventLoopError;
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use crate::event::Event;
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use crate::event_loop::ActiveEventLoop as RootActiveEventLoop;
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use super::{backend, device, window};
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mod proxy;
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pub(crate) mod runner;
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mod state;
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mod window_target;
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pub(crate) use proxy::EventLoopProxy;
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pub(crate) use window_target::{ActiveEventLoop, OwnedDisplayHandle};
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pub struct EventLoop<T: 'static> {
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elw: RootActiveEventLoop,
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user_event_sender: Sender<T>,
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user_event_receiver: Receiver<T>,
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}
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#[derive(Default, Debug, Copy, Clone, PartialEq, Eq, Hash)]
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pub(crate) struct PlatformSpecificEventLoopAttributes {}
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impl<T> EventLoop<T> {
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pub(crate) fn new(_: &PlatformSpecificEventLoopAttributes) -> Result<Self, EventLoopError> {
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let (user_event_sender, user_event_receiver) = mpsc::channel();
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let elw = RootActiveEventLoop { p: ActiveEventLoop::new(), _marker: PhantomData };
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Ok(EventLoop { elw, user_event_sender, user_event_receiver })
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}
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pub fn run_app<A: ApplicationHandler<T>>(self, app: &mut A) -> ! {
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let target = RootActiveEventLoop { p: self.elw.p.clone(), _marker: PhantomData };
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// SAFETY: Don't use `move` to make sure we leak the `event_handler` and `target`.
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let handler: Box<dyn FnMut(Event<()>)> =
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Box::new(|event| handle_event(app, &target, &self.user_event_receiver, event));
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// SAFETY: The `transmute` is necessary because `run()` requires `'static`. This is safe
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// because this function will never return and all resources not cleaned up by the point we
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// `throw` will leak, making this actually `'static`.
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let handler = unsafe { std::mem::transmute(handler) };
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self.elw.p.run(handler, false);
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// Throw an exception to break out of Rust execution and use unreachable to tell the
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// compiler this function won't return, giving it a return type of '!'
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backend::throw(
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"Using exceptions for control flow, don't mind me. This isn't actually an error!",
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);
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unreachable!();
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}
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pub fn spawn_app<A: ApplicationHandler<T> + 'static>(self, mut app: A) {
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let target = RootActiveEventLoop { p: self.elw.p.clone(), _marker: PhantomData };
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self.elw.p.run(
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Box::new(move |event| {
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handle_event(&mut app, &target, &self.user_event_receiver, event)
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}),
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true,
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);
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}
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pub fn create_proxy(&self) -> EventLoopProxy<T> {
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EventLoopProxy::new(self.elw.p.waker(), self.user_event_sender.clone())
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}
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pub fn window_target(&self) -> &RootActiveEventLoop {
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&self.elw
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}
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}
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fn handle_event<T: 'static, A: ApplicationHandler<T>>(
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app: &mut A,
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target: &RootActiveEventLoop,
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user_event_receiver: &Receiver<T>,
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event: Event<()>,
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) {
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match event {
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Event::NewEvents(cause) => app.new_events(target, cause),
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Event::WindowEvent { window_id, event } => app.window_event(target, window_id, event),
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Event::DeviceEvent { device_id, event } => app.device_event(target, device_id, event),
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Event::UserEvent(_) => {
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let event =
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user_event_receiver.try_recv().expect("user event signaled but not received");
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app.user_event(target, event);
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},
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Event::Suspended => app.suspended(target),
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Event::Resumed => app.resumed(target),
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Event::AboutToWait => app.about_to_wait(target),
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Event::LoopExiting => app.exiting(target),
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Event::MemoryWarning => app.memory_warning(target),
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}
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}
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