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