53 lines
1.3 KiB
Rust
53 lines
1.3 KiB
Rust
use bevy::prelude::*;
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/// This example creates a new event, a system that triggers the event once per second,
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/// and a system that prints a message whenever the event is received.
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fn main() {
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App::build()
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.add_plugins(DefaultPlugins)
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.add_event::<MyEvent>()
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.init_resource::<EventTriggerState>()
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.add_system(event_trigger_system)
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.add_system(event_listener_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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struct EventTriggerState {
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event_timer: Timer,
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}
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impl Default for EventTriggerState {
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fn default() -> Self {
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EventTriggerState {
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event_timer: Timer::from_seconds(1.0, true),
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}
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}
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}
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// sends MyEvent every second
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fn event_trigger_system(
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time: Res<Time>,
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mut state: ResMut<EventTriggerState>,
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mut my_events: ResMut<Events<MyEvent>>,
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) {
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if state.event_timer.tick(time.delta_seconds).finished {
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my_events.send(MyEvent {
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message: "MyEvent just happened!".to_string(),
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});
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}
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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 my_event_reader: Local<EventReader<MyEvent>>,
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my_events: Res<Events<MyEvent>>,
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) {
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for my_event in 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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