53 lines
1.2 KiB
Rust
53 lines
1.2 KiB
Rust
use bevy::prelude::*;
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fn main() {
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App::build()
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.add_default_plugins()
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.add_event::<MyEvent>()
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.add_resource(EventTriggerState::default())
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.add_resource_init::<EventListenerState>()
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.add_system(event_trigger_system.system())
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.add_system(event_listener_system.system())
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.run();
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}
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struct MyEvent {
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pub message: String,
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}
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#[derive(Default)]
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struct EventTriggerState {
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elapsed: f32,
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}
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// sends MyEvent every second
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fn event_trigger_system(
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mut state: ResourceMut<EventTriggerState>,
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mut my_events: ResourceMut<Events<MyEvent>>,
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time: Resource<Time>,
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) {
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state.elapsed += time.delta_seconds;
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if state.elapsed > 1.0 {
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my_events.send(MyEvent {
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message: "Hello World".to_string(),
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});
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state.elapsed = 0.0;
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}
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}
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#[derive(Resource)]
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struct EventListenerState {
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my_event_reader: EventReader<MyEvent>,
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}
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// prints events as they come in
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fn event_listener_system(
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mut state: ResourceMut<EventListenerState>,
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my_events: Resource<Events<MyEvent>>,
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) {
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for my_event in state.my_event_reader.iter(&my_events) {
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println!("{}", my_event.message);
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}
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}
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