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//! Component events.
use std::fmt::{Debug, Formatter};
use std::marker::PhantomData;
use ecs_macros::Component;
use crate::component::{Component, Id as ComponentId};
use crate::event::{Event, Id};
use crate::tuple::{ReduceElement as TupleReduceElement, With as TupleWith};
/// Event emitted when:
/// a) A entity with component `ComponentT` is spawned.
/// b) A component `ComponentT` is added to a entity.
pub struct Added<ComponentT>
where
ComponentT: Component,
{
_pd: PhantomData<ComponentT>,
}
impl<ComponentT> Debug for Added<ComponentT>
where
ComponentT: Component,
{
fn fmt(&self, formatter: &mut Formatter<'_>) -> std::fmt::Result
{
formatter
.debug_struct("Added")
.field("_pd", &self._pd)
.finish()
}
}
impl<ComponentT> Default for Added<ComponentT>
where
ComponentT: Component,
{
fn default() -> Self
{
Self { _pd: PhantomData }
}
}
impl<ComponentT> Event for Added<ComponentT>
where
ComponentT: Component,
{
fn id() -> Id
where
Self: Sized,
{
Id::new::<Added<ComponentForId>, _>(Some(ComponentId::of::<ComponentT>()))
}
}
pub fn create_added_id(component_id: ComponentId) -> Id
{
Id::new::<Added<ComponentForId>, _>(Some(component_id))
}
pub struct ComponentToAddedEvent;
impl<ComponentT: Component, Accumulator>
TupleReduceElement<Accumulator, ComponentToAddedEvent> for ComponentT
where
Accumulator: TupleWith<Added<Self>>,
{
type Return = Accumulator::With;
}
use crate as ecs;
#[derive(Debug, Component)]
struct ComponentForId;
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