feat: add opt-out support for bevy_eventlistener (#16)

Cargo.toml

@@ -19,6 +19,7 @@ resolver = "2"
 
 [dependencies]
 bevy = { version = "0.13.0", default-features = false }
+bevy_eventlistener = { version = "0.7.0", optional = true }
 
 [dev-dependencies]
 bevy-inspector-egui = "0.23"
@@ -30,7 +31,8 @@ default = [
   "span_tween",
   "bevy_asset",
   "bevy_render",
-  "bevy_sprite"
+  "bevy_sprite",
+  "bevy_eventlistener"
 ]
 
 # Tweener implementation by defining a tween in range of time.
@@ -42,6 +44,8 @@ bevy_asset = [ "bevy/bevy_asset" ]
 bevy_render = [ "bevy/bevy_render"]
 # Add some built-in interpolator related to sprite
 bevy_sprite = [ "bevy/bevy_sprite", "bevy_render" ]
+# Add entity-targeted events with bevy_eventlistener
+bevy_eventlistener = [ "dep:bevy_eventlistener" ]
 
 [package.metadata.docs.rs]
 all-features = true
@@ -108,6 +112,14 @@ required-features = [
   "span_tween",
 ]
 
+[[example]]
+name = "entity_event"
+path = "examples/demo/entity_event.rs"
+required-features = [
+  "span_tween",
+  "bevy_eventlistener"
+]
+
 [[example]]
 name = "sprite_sheet"
 path = "examples/demo/sprite_sheet.rs"

examples/demo/entity_event.rs

@@ -0,0 +1,24 @@
+use bevy::prelude::*;
+use bevy_tween::prelude::*;
+use bevy_eventlistener::prelude::*;
+
+fn main() {
+    App::new()
+        .add_plugins((MinimalPlugins, DefaultTweenPlugins))
+        .add_systems(Startup, setup)
+        .run();
+}
+
+fn setup(mut commands: Commands) {
+    commands.spawn((
+        SpanTweenerBundle::new(Duration::from_secs_f32(0.5))
+            .with_repeat(Repeat::times(5)),
+        On::<SpanTweenerEnded>::run(|listener: Listener<SpanTweenerEnded>| {
+            if listener.is_completed() {
+                println!("done!");
+            } else {
+                println!("repeating");
+            }
+        })
+    ));
+}

src/span_tween.rs

@@ -116,6 +116,8 @@ use std::{cmp::Ordering, ops, time::Duration};
 
 use crate::utils;
 use bevy::{ecs::system::EntityCommands, prelude::*};
+#[cfg(feature = "bevy_eventlistener")]
+use bevy_eventlistener::prelude::*;
 use tween_timer::{Repeat, RepeatStyle};
 
 use crate::{
@@ -152,6 +154,9 @@ impl Plugin for SpanTweenPlugin {
         .register_type::<TimeBound>()
         .register_type::<TweenTimeSpan>()
         .add_event::<SpanTweenerEnded>();
+
+        #[cfg(feature = "bevy_eventlistener")]
+        app.add_plugins(EventListenerPlugin::<SpanTweenerEnded>::default());
     }
 }
 
@@ -642,9 +647,12 @@ pub fn span_tween(duration: Duration) -> QuickSpanTweenBundle {
 }
 
 /// Fired when a span tweener repeated or completed
+#[cfg_attr(feature = "bevy_eventlistener", derive(EntityEvent))]
+#[cfg_attr(feature = "bevy_eventlistener", can_bubble)]
 #[derive(Debug, Clone, PartialEq, Eq, Hash, Event, Reflect)]
 pub struct SpanTweenerEnded {
     /// Tween timer that just ended
+    #[cfg_attr(feature = "bevy_eventlistener", target)]
     pub tweener: Entity,
     /// Currently timer direction. If is [`RepeatStyle::PingPong`], the current
     /// direction will be its already changed direction.