bevy_ecs/reflect/
map_entities.rs

1use crate::entity::{EntityMapper, MapEntities};
2use bevy_reflect::{FromReflect, FromType, PartialReflect};
3
4/// For a specific type of value, this maps any fields with values of type [`Entity`] to a new world.
5///
6/// Since a given `Entity` ID is only valid for the world it came from, when performing deserialization
7/// any stored IDs need to be re-allocated in the destination world.
8///
9/// See [`EntityMapper`] and [`MapEntities`] for more information.
10///
11/// [`Entity`]: crate::entity::Entity
12/// [`EntityMapper`]: crate::entity::EntityMapper
13#[derive(Clone)]
14pub struct ReflectMapEntities {
15    map_entities: fn(&mut dyn PartialReflect, &mut dyn EntityMapper),
16}
17
18impl ReflectMapEntities {
19    /// A general method for remapping entities in a reflected value via an [`EntityMapper`].
20    ///
21    /// # Panics
22    /// Panics if the type of the reflected value doesn't match.
23    pub fn map_entities(&self, reflected: &mut dyn PartialReflect, mapper: &mut dyn EntityMapper) {
24        (self.map_entities)(reflected, mapper);
25    }
26}
27
28impl<C: FromReflect + MapEntities> FromType<C> for ReflectMapEntities {
29    fn from_type() -> Self {
30        ReflectMapEntities {
31            map_entities: |reflected, mut mapper| {
32                let mut concrete = C::from_reflect(reflected).expect("reflected type should match");
33                concrete.map_entities(&mut mapper);
34                reflected.apply(&concrete);
35            },
36        }
37    }
38}
bevy_ecs/reflect/map_entities.rs

bevy_ecs/reflect/
map_entities.rs
