pub struct ChildOf(pub Entity);
Expand description
Stores the parent entity of this child entity with this component.
This is a Relationship
component, and creates the canonical
“parent / child” hierarchy. This is the “source of truth” component, and it pairs with
the Children
RelationshipTarget
.
This relationship should be used for things like:
- Organizing entities in a scene
- Propagating configuration or data inherited from a parent, such as “visibility” or “world-space global transforms”.
- Ensuring a hierarchy is despawned when an entity is despawned.
ChildOf
contains a single “target” Entity
. When ChildOf
is inserted on a “source” entity,
the “target” entity will automatically (and immediately, via a component hook) have a Children
component inserted, and the “source” entity will be added to that Children
instance.
If the ChildOf
component is replaced with a different “target” entity, the old target’s Children
will be automatically (and immediately, via a component hook) be updated to reflect that change.
Likewise, when the ChildOf
component is removed, the “source” entity will be removed from the old
target’s Children
. If this results in Children
being empty, Children
will be automatically removed.
When a parent is despawned, all children (and their descendants) will also be despawned.
You can create parent-child relationships in a variety of ways. The most direct way is to insert a ChildOf
component:
let root = world.spawn_empty().id();
let child1 = world.spawn(ChildOf(root)).id();
let child2 = world.spawn(ChildOf(root)).id();
let grandchild = world.spawn(ChildOf(child1)).id();
assert_eq!(&**world.entity(root).get::<Children>().unwrap(), &[child1, child2]);
assert_eq!(&**world.entity(child1).get::<Children>().unwrap(), &[grandchild]);
world.entity_mut(child2).remove::<ChildOf>();
assert_eq!(&**world.entity(root).get::<Children>().unwrap(), &[child1]);
world.entity_mut(root).despawn();
assert!(world.get_entity(root).is_err());
assert!(world.get_entity(child1).is_err());
assert!(world.get_entity(grandchild).is_err());
However if you are spawning many children, you might want to use the EntityWorldMut::with_children
helper instead:
let mut child1 = Entity::PLACEHOLDER;
let mut child2 = Entity::PLACEHOLDER;
let mut grandchild = Entity::PLACEHOLDER;
let root = world.spawn_empty().with_children(|p| {
child1 = p.spawn_empty().with_children(|p| {
grandchild = p.spawn_empty().id();
}).id();
child2 = p.spawn_empty().id();
}).id();
assert_eq!(&**world.entity(root).get::<Children>().unwrap(), &[child1, child2]);
assert_eq!(&**world.entity(child1).get::<Children>().unwrap(), &[grandchild]);
Tuple Fields§
§0: Entity
Implementations§
Trait Implementations§
Source§impl Component for ChildOf
impl Component for ChildOf
Source§const STORAGE_TYPE: StorageType = bevy_ecs::component::StorageType::Table
const STORAGE_TYPE: StorageType = bevy_ecs::component::StorageType::Table
Source§type Mutability = Immutable
type Mutability = Immutable
Component<Mutability = Mutable>
,
while immutable components will instead have Component<Mutability = Immutable>
. Read moreSource§fn register_required_components(
_requiree: ComponentId,
required_components: &mut RequiredComponentsRegistrator<'_, '_>,
)
fn register_required_components( _requiree: ComponentId, required_components: &mut RequiredComponentsRegistrator<'_, '_>, )
Source§fn on_insert() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>
fn on_insert() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>
Source§fn on_replace() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>
fn on_replace() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>
Source§fn clone_behavior() -> ComponentCloneBehavior
fn clone_behavior() -> ComponentCloneBehavior
Source§fn map_entities<M>(this: &mut ChildOf, mapper: &mut M)where
M: EntityMapper,
fn map_entities<M>(this: &mut ChildOf, mapper: &mut M)where
M: EntityMapper,
EntityMapper
. This is used to remap entities in contexts like scenes and entity cloning.
When deriving Component
, this is populated by annotating fields containing entities with #[entities]
Read moreSource§fn on_add() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>
fn on_add() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>
Source§fn on_remove() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>
fn on_remove() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>
Source§fn on_despawn() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>
fn on_despawn() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>
Source§impl<'de> Deserialize<'de> for ChildOf
impl<'de> Deserialize<'de> for ChildOf
Source§fn deserialize<__D>(
__deserializer: __D,
) -> Result<ChildOf, <__D as Deserializer<'de>>::Error>where
__D: Deserializer<'de>,
fn deserialize<__D>(
__deserializer: __D,
) -> Result<ChildOf, <__D as Deserializer<'de>>::Error>where
__D: Deserializer<'de>,
Source§impl FromReflect for ChildOf
impl FromReflect for ChildOf
Source§fn from_reflect(reflect: &(dyn PartialReflect + 'static)) -> Option<ChildOf>
fn from_reflect(reflect: &(dyn PartialReflect + 'static)) -> Option<ChildOf>
Self
from a reflected value.Source§fn take_from_reflect(
reflect: Box<dyn PartialReflect>,
) -> Result<Self, Box<dyn PartialReflect>>
fn take_from_reflect( reflect: Box<dyn PartialReflect>, ) -> Result<Self, Box<dyn PartialReflect>>
Self
using,
constructing the value using from_reflect
if that fails. Read moreSource§impl GetTypeRegistration for ChildOf
impl GetTypeRegistration for ChildOf
Source§fn get_type_registration() -> TypeRegistration
fn get_type_registration() -> TypeRegistration
TypeRegistration
for this type.Source§fn register_type_dependencies(registry: &mut TypeRegistry)
fn register_type_dependencies(registry: &mut TypeRegistry)
Source§impl PartialReflect for ChildOf
impl PartialReflect for ChildOf
Source§fn get_represented_type_info(&self) -> Option<&'static TypeInfo>
fn get_represented_type_info(&self) -> Option<&'static TypeInfo>
Source§fn try_apply(
&mut self,
value: &(dyn PartialReflect + 'static),
) -> Result<(), ApplyError>
fn try_apply( &mut self, value: &(dyn PartialReflect + 'static), ) -> Result<(), ApplyError>
Source§fn reflect_kind(&self) -> ReflectKind
fn reflect_kind(&self) -> ReflectKind
Source§fn reflect_ref(&self) -> ReflectRef<'_>
fn reflect_ref(&self) -> ReflectRef<'_>
Source§fn reflect_mut(&mut self) -> ReflectMut<'_>
fn reflect_mut(&mut self) -> ReflectMut<'_>
Source§fn reflect_owned(self: Box<ChildOf>) -> ReflectOwned
fn reflect_owned(self: Box<ChildOf>) -> ReflectOwned
Source§fn try_into_reflect(
self: Box<ChildOf>,
) -> Result<Box<dyn Reflect>, Box<dyn PartialReflect>>
fn try_into_reflect( self: Box<ChildOf>, ) -> Result<Box<dyn Reflect>, Box<dyn PartialReflect>>
Source§fn try_as_reflect(&self) -> Option<&(dyn Reflect + 'static)>
fn try_as_reflect(&self) -> Option<&(dyn Reflect + 'static)>
Source§fn try_as_reflect_mut(&mut self) -> Option<&mut (dyn Reflect + 'static)>
fn try_as_reflect_mut(&mut self) -> Option<&mut (dyn Reflect + 'static)>
Source§fn into_partial_reflect(self: Box<ChildOf>) -> Box<dyn PartialReflect>
fn into_partial_reflect(self: Box<ChildOf>) -> Box<dyn PartialReflect>
Source§fn as_partial_reflect(&self) -> &(dyn PartialReflect + 'static)
fn as_partial_reflect(&self) -> &(dyn PartialReflect + 'static)
Source§fn as_partial_reflect_mut(&mut self) -> &mut (dyn PartialReflect + 'static)
fn as_partial_reflect_mut(&mut self) -> &mut (dyn PartialReflect + 'static)
Source§fn reflect_partial_eq(
&self,
value: &(dyn PartialReflect + 'static),
) -> Option<bool>
fn reflect_partial_eq( &self, value: &(dyn PartialReflect + 'static), ) -> Option<bool>
Source§fn debug(&self, f: &mut Formatter<'_>) -> Result<(), Error>
fn debug(&self, f: &mut Formatter<'_>) -> Result<(), Error>
Source§fn reflect_clone(&self) -> Result<Box<dyn Reflect>, ReflectCloneError>
fn reflect_clone(&self) -> Result<Box<dyn Reflect>, ReflectCloneError>
Self
using reflection. Read moreSource§fn apply(&mut self, value: &(dyn PartialReflect + 'static))
fn apply(&mut self, value: &(dyn PartialReflect + 'static))
Source§fn to_dynamic(&self) -> Box<dyn PartialReflect>
fn to_dynamic(&self) -> Box<dyn PartialReflect>
Source§fn reflect_clone_and_take<T>(&self) -> Result<T, ReflectCloneError>
fn reflect_clone_and_take<T>(&self) -> Result<T, ReflectCloneError>
PartialReflect
, combines reflect_clone
and
take
in a useful fashion, automatically constructing an appropriate
ReflectCloneError
if the downcast fails. Read moreSource§fn reflect_hash(&self) -> Option<u64>
fn reflect_hash(&self) -> Option<u64>
Source§fn is_dynamic(&self) -> bool
fn is_dynamic(&self) -> bool
Source§impl Reflect for ChildOf
impl Reflect for ChildOf
Source§fn into_any(self: Box<ChildOf>) -> Box<dyn Any>
fn into_any(self: Box<ChildOf>) -> Box<dyn Any>
Box<dyn Any>
. Read moreSource§fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
&mut dyn Any
. Read moreSource§fn into_reflect(self: Box<ChildOf>) -> Box<dyn Reflect>
fn into_reflect(self: Box<ChildOf>) -> Box<dyn Reflect>
Source§fn as_reflect(&self) -> &(dyn Reflect + 'static)
fn as_reflect(&self) -> &(dyn Reflect + 'static)
Source§fn as_reflect_mut(&mut self) -> &mut (dyn Reflect + 'static)
fn as_reflect_mut(&mut self) -> &mut (dyn Reflect + 'static)
Source§impl Relationship for ChildOf
impl Relationship for ChildOf
Source§type RelationshipTarget = Children
type RelationshipTarget = Children
Component
added to the “target” entities of this Relationship
, which contains the list of all “source”
entities that relate to the “target”.Source§fn set_risky(&mut self, entity: Entity)
fn set_risky(&mut self, entity: Entity)
Entity
ID of the entity containing the RelationshipTarget
to another one. Read moreSource§fn on_insert(world: DeferredWorld<'_>, _: HookContext)
fn on_insert(world: DeferredWorld<'_>, _: HookContext)
Source§fn on_replace(world: DeferredWorld<'_>, _: HookContext)
fn on_replace(world: DeferredWorld<'_>, _: HookContext)
Source§impl Serialize for ChildOf
impl Serialize for ChildOf
Source§fn serialize<__S>(
&self,
__serializer: __S,
) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>where
__S: Serializer,
fn serialize<__S>(
&self,
__serializer: __S,
) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>where
__S: Serializer,
Source§impl TupleStruct for ChildOf
impl TupleStruct for ChildOf
Source§fn field(&self, index: usize) -> Option<&(dyn PartialReflect + 'static)>
fn field(&self, index: usize) -> Option<&(dyn PartialReflect + 'static)>
index
as a
&dyn Reflect
.Source§fn field_mut(
&mut self,
index: usize,
) -> Option<&mut (dyn PartialReflect + 'static)>
fn field_mut( &mut self, index: usize, ) -> Option<&mut (dyn PartialReflect + 'static)>
index
as a &mut dyn Reflect
.Source§fn iter_fields(&self) -> TupleStructFieldIter<'_> ⓘ
fn iter_fields(&self) -> TupleStructFieldIter<'_> ⓘ
Source§fn to_dynamic_tuple_struct(&self) -> DynamicTupleStruct
fn to_dynamic_tuple_struct(&self) -> DynamicTupleStruct
DynamicTupleStruct
from this tuple struct.Source§fn get_represented_tuple_struct_info(&self) -> Option<&'static TupleStructInfo>
fn get_represented_tuple_struct_info(&self) -> Option<&'static TupleStructInfo>
None
if TypeInfo
is not available.Source§impl TypePath for ChildOf
impl TypePath for ChildOf
Source§fn type_path() -> &'static str
fn type_path() -> &'static str
Source§fn short_type_path() -> &'static str
fn short_type_path() -> &'static str
Source§fn type_ident() -> Option<&'static str>
fn type_ident() -> Option<&'static str>
Source§fn crate_name() -> Option<&'static str>
fn crate_name() -> Option<&'static str>
impl Eq for ChildOf
impl StructuralPartialEq for ChildOf
Auto Trait Implementations§
impl Freeze for ChildOf
impl RefUnwindSafe for ChildOf
impl Send for ChildOf
impl Sync for ChildOf
impl Unpin for ChildOf
impl UnwindSafe for ChildOf
Blanket Implementations§
Source§impl<T, U> AsBindGroupShaderType<U> for T
impl<T, U> AsBindGroupShaderType<U> for T
Source§fn as_bind_group_shader_type(&self, _images: &RenderAssets<GpuImage>) -> U
fn as_bind_group_shader_type(&self, _images: &RenderAssets<GpuImage>) -> U
T
ShaderType
for self
. When used in AsBindGroup
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T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
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fn borrow_mut(&mut self) -> &mut T
Source§impl<C> Bundle for Cwhere
C: Component,
impl<C> Bundle for Cwhere
C: Component,
fn component_ids( components: &mut ComponentsRegistrator<'_>, ids: &mut impl FnMut(ComponentId), )
Source§fn get_component_ids(
components: &Components,
ids: &mut impl FnMut(Option<ComponentId>),
)
fn get_component_ids( components: &Components, ids: &mut impl FnMut(Option<ComponentId>), )
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C: Component,
impl<C> BundleFromComponents for Cwhere
C: Component,
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T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
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T: Any,
impl<T> Downcast for Twhere
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_ptr: MovingPtr<'_, MaybeUninit<C>>,
_entity: &mut EntityWorldMut<'_>,
)
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