mirror of
https://github.com/bevyengine/bevy
synced 2024-11-10 07:04:33 +00:00
cfcb56f5b9
# Objective
- Continue to pare down the uses on NonSend resources in the engine. In
this case, EventLoopProxy used to be `!Sync`, but is now `Sync` in the
latest version of winit.
## Solution
- New type `EventLoopProxy` as `EventLoopProxyWrapper` to make it into a
normal resource.
- Update the `custom_user_event` example as it no longer needs to
indirectly access the `EventLoopProxy` through a static variable
anymore.
## Testing
- Ran the example. The resource exists just for users to use, so there
aren't any in engine uses for it currently.
---
## Changelog
- make EventLoopProxy into a regular resource.
## Migration Guide
`EventLoopProxy` has been renamed to `EventLoopProxyWrapper` and is now
`Send`, making it an ordinary resource.
Before:
```rust
event_loop_system(event_loop: NonSend<EventLoopProxy<MyEvent>>) {
event_loop.send_event(MyEvent);
}
```
After:
```rust
event_loop_system(event_loop: Res<EventLoopProxy<MyEvent>>) {
event_loop.send_event(MyEvent);
}
```
112 lines
3.3 KiB
Rust
112 lines
3.3 KiB
Rust
//! Shows how to create a custom event that can be handled by `winit`'s event loop.
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use bevy::prelude::*;
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use bevy::winit::{EventLoopProxyWrapper, WakeUp, WinitPlugin};
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use std::fmt::Formatter;
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#[derive(Default, Debug, Event)]
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enum CustomEvent {
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#[default]
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WakeUp,
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Key(char),
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}
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impl std::fmt::Display for CustomEvent {
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fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
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match self {
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Self::WakeUp => write!(f, "Wake up"),
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Self::Key(ch) => write!(f, "Key: {ch}"),
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}
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}
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}
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fn main() {
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let winit_plugin = WinitPlugin::<CustomEvent>::default();
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App::new()
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.add_plugins(
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DefaultPlugins
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.build()
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// Only one event type can be handled at once
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// so we must disable the default event type
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.disable::<WinitPlugin<WakeUp>>()
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.add(winit_plugin),
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)
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.add_systems(
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Startup,
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(
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setup,
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#[cfg(target_arch = "wasm32")]
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wasm::setup_js_closure,
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),
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)
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.add_systems(Update, (send_event, handle_event))
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.run();
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}
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fn setup(mut commands: Commands) {
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commands.spawn(Camera2dBundle::default());
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}
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fn send_event(
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input: Res<ButtonInput<KeyCode>>,
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event_loop_proxy: Res<EventLoopProxyWrapper<CustomEvent>>,
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) {
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if input.just_pressed(KeyCode::Space) {
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let _ = event_loop_proxy.send_event(CustomEvent::WakeUp);
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}
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// This simulates sending a custom event through an external thread.
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#[cfg(not(target_arch = "wasm32"))]
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if input.just_pressed(KeyCode::KeyE) {
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let event_loop_proxy = event_loop_proxy.clone();
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let handler = std::thread::spawn(move || {
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let _ = event_loop_proxy.clone().send_event(CustomEvent::Key('e'));
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});
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handler.join().unwrap();
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}
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}
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fn handle_event(mut events: EventReader<CustomEvent>) {
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for evt in events.read() {
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info!("Received event: {evt:?}");
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}
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}
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/// Since the [`EventLoopProxy`] can be exposed to the javascript environment, it can
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/// be used to send events inside the loop, to be handled by a system or simply to wake up
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/// the loop if that's currently waiting for a timeout or a user event.
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#[cfg(target_arch = "wasm32")]
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pub(crate) mod wasm {
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use super::*;
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use bevy::winit::EventLoopProxy;
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use wasm_bindgen::prelude::*;
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use wasm_bindgen::JsCast;
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use web_sys::KeyboardEvent;
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pub(crate) fn setup_js_closure(event_loop: Res<EventLoopProxyWrapper<CustomEvent>>) {
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let window = web_sys::window().unwrap();
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let document = window.document().unwrap();
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let event_loop = event_loop.clone();
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let closure = Closure::wrap(Box::new(move |event: KeyboardEvent| {
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let key = event.key();
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if key == "e" {
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send_custom_event('e', &event_loop).unwrap();
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}
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}) as Box<dyn FnMut(KeyboardEvent)>);
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document
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.add_event_listener_with_callback("keydown", closure.as_ref().unchecked_ref())
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.unwrap();
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closure.forget();
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}
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fn send_custom_event(ch: char, proxy: &EventLoopProxy<CustomEvent>) -> Result<(), String> {
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proxy
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.send_event(CustomEvent::Key(ch))
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.map_err(|_| "Failed to send event".to_string())
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}
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}
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