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feat: remove_component for ReflectComponent (#2682)

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# Objective

While implementing a plugin for my rollback networking library, I needed to load/save parts of the world. For this, I made a WorldSnapshot that works quite like the current DynamicScene. Using a TypeRegistry to register component types I want to save/load and then using ReflectComponents methods to add or apply components of the given types. 

However, I noticed there is no method to remove components from entities through the ReflectComponent.

## Solution

I added a `remove_component` field to the `ReflectComponent` struct, as well as a `pub fn remove_component(&self, world: &mut World, entity: Entity)` to call that function in `remove_component`. This follows exactly the same pattern all other methods/fields in this struct look like.

This is an example how it could be used (at least how I would use it):
6c003f86f1/src/world_snapshot.rs (L133)
This commit is contained in:
Georg Friedrich Schuppe 2021-08-18 20:57:58 +00:00
parent 9d453530fa
commit 98a08cf495
1 changed files with 8 additions and 0 deletions
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8
crates/bevy_ecs/src/reflect.rs
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@ -10,6 +10,7 @@ use bevy_reflect::{impl_reflect_value, FromType, Reflect, ReflectDeserialize};
pub struct ReflectComponent {
add_component: fn(&mut World, Entity, &dyn Reflect),
apply_component: fn(&mut World, Entity, &dyn Reflect),
remove_component: fn(&mut World, Entity),
reflect_component: fn(&World, Entity) -> Option<&dyn Reflect>,
reflect_component_mut: unsafe fn(&World, Entity) -> Option<ReflectMut>,
copy_component: fn(&World, &mut World, Entity, Entity),
@ -24,6 +25,10 @@ impl ReflectComponent {
(self.apply_component)(world, entity, component);
}
pub fn remove_component(&self, world: &mut World, entity: Entity) {
(self.remove_component)(world, entity);
}
pub fn reflect_component<'a>(
&self,
world: &'a World,
@ -83,6 +88,9 @@ impl<C: Component + Reflect + FromWorld> FromType<C> for ReflectComponent {
let mut component = world.get_mut::<C>(entity).unwrap();
component.apply(reflected_component);
},
remove_component: |world, entity| {
world.entity_mut(entity).remove::<C>();
},
copy_component: |source_world, destination_world, source_entity, destination_entity| {
let source_component = source_world.get::<C>(source_entity).unwrap();
let mut destination_component = C::from_world(destination_world);