beet_dom 0.0.8

Utilities for dom rendering and interaction
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38

use crate::prelude::*;
use beet_core::prelude::*;
use bevy::ecs::system::IntoObserverSystem;

/// A typed version of [`OnSpawn::obsserve`]
/// which will also insert an [`EventTarget`]
#[derive(BundleEffect)]
pub struct EventHandler<E: 'static + Send + Sync + Event> {
	observer: Observer,
	_phantom: std::marker::PhantomData<E>,
}

impl<E: 'static + Send + Sync + Event> EventHandler<E> {
	/// Create a new event handler for the given event type
	pub fn new<B: Bundle, M>(
		handler: impl IntoObserverSystem<E, B, M>,
	) -> Self {
		Self {
			observer: Observer::new(handler),
			_phantom: std::marker::PhantomData,
		}
	}
	fn effect(self, entity: &mut EntityWorldMut) {
		entity.insert(EventTarget);
		let observer = self.observer.with_entity(entity.id());
		entity.world_scope(move |world| {
			world.spawn(observer);
		});
	}
}


/// Marker type added to any entity with an event handler, often
/// as an attribute.
#[derive(Default, Clone, PartialEq, Eq, Hash, Component, Reflect)]
#[reflect(Default, Component)]
#[require(RequiresDomIdx)]
pub struct EventTarget;