Replace event derives with message derives

src/messages.rs

@@ -6,15 +6,15 @@ use crate::objects::AsteroidSize;
 ///
 /// Produced by the [`fn collision_listener(...)`](`crate::physics::collision_listener`)
 /// system when the player collides with an asteroid. They are consumed by [`fn ship_impact_listener(...)`](`crate::objects::ship_impact_listener`).
-#[derive(Event)]
+#[derive(Message)]
 pub(crate) struct ShipDestroy;
 
 /// Signals that a particular asteroid has been destroyed.
 ///
 /// Produced by the [`fn collision_listener(...)`](`crate::physics::collision_listener`)
 /// system when bullets contact asteroids. It is consumed by [`fn split_asteroid(...)`](`crate::objects::spawn_asteroid`)
-/// system, which re-emits [spawn events](`SpawnAsteroid`).
+/// system, which re-emits [spawn messages](`SpawnAsteroid`).
-#[derive(Event)]
+#[derive(Message)]
 pub(crate) struct AsteroidDestroy(pub Entity);
 
 /// Signals that an asteroid needs to be spawned and provides the parameters
@@ -22,7 +22,7 @@ pub(crate) struct AsteroidDestroy(pub Entity);
 ///
 /// Produced by the [`tick_asteroid_manager(...)`](`crate::machinery::tick_asteroid_manager`)
 /// system and consumed by the [`spawn_asteroid(...)`](`crate::objects::spawn_asteroid`) system.
-#[derive(Event)]
+#[derive(Message)]
 pub struct SpawnAsteroid {
     pub pos: Vec2,
     pub vel: Vec2,
@@ -32,5 +32,5 @@ pub struct SpawnAsteroid {
 /// Signals that a particular bullet has been destroyed (after it strikes an Asteroid).
 ///
 /// TODO: Maybe use it for lifetime expiration (which is also a TODO item).
-#[derive(Event)]
+#[derive(Message)]
 pub(crate) struct BulletDestroy(pub Entity);