Struct bevy_asset::ReflectHandle
source · pub struct ReflectHandle { /* private fields */ }
Expand description
Reflect type data struct relating a Handle<T>
back to the T
asset type.
Say you want to look up the asset values of a list of handles when you have access to their &dyn Reflect
form.
Assets can be looked up in the world using ReflectAsset
, but how do you determine which ReflectAsset
to use when
only looking at the handle? ReflectHandle
is stored in the type registry on each Handle<T>
type, so you can use ReflectHandle::asset_type_id
to look up
the ReflectAsset
type data on the corresponding T
asset type:
use bevy_asset::{ReflectHandle, ReflectAsset};
let handles: Vec<&dyn Reflect> = unimplemented!();
for handle in handles {
let reflect_handle = type_registry.get_type_data::<ReflectHandle>(handle.type_id()).unwrap();
let reflect_asset = type_registry.get_type_data::<ReflectAsset>(reflect_handle.asset_type_id()).unwrap();
let handle = reflect_handle.downcast_handle_untyped(handle.as_any()).unwrap();
let value = reflect_asset.get(world, handle).unwrap();
println!("{value:?}");
}
Implementations§
source§impl ReflectHandle
impl ReflectHandle
sourcepub fn asset_type_id(&self) -> TypeId
pub fn asset_type_id(&self) -> TypeId
The TypeId
of the asset
sourcepub fn downcast_handle_untyped(&self, handle: &dyn Any) -> Option<UntypedHandle>
pub fn downcast_handle_untyped(&self, handle: &dyn Any) -> Option<UntypedHandle>
A way to go from a Handle<T>
in a dyn Any
to a UntypedHandle
sourcepub fn typed(&self, handle: UntypedHandle) -> Box<dyn Reflect>
pub fn typed(&self, handle: UntypedHandle) -> Box<dyn Reflect>
A way to go from a UntypedHandle
to a Handle<T>
in a Box<dyn Reflect>
.
Equivalent of UntypedHandle::typed
.
Trait Implementations§
source§impl Clone for ReflectHandle
impl Clone for ReflectHandle
source§fn clone(&self) -> ReflectHandle
fn clone(&self) -> ReflectHandle
Returns a copy of the value. Read more
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from
source
. Read moreAuto Trait Implementations§
impl Freeze for ReflectHandle
impl RefUnwindSafe for ReflectHandle
impl Send for ReflectHandle
impl Sync for ReflectHandle
impl Unpin for ReflectHandle
impl UnwindSafe for ReflectHandle
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
source§impl<T> Downcast for Twhere
T: Any,
impl<T> Downcast for Twhere
T: Any,
source§fn into_any(self: Box<T>) -> Box<dyn Any>
fn into_any(self: Box<T>) -> Box<dyn Any>
Convert
Box<dyn Trait>
(where Trait: Downcast
) to Box<dyn Any>
. Box<dyn Any>
can
then be further downcast
into Box<ConcreteType>
where ConcreteType
implements Trait
.source§fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>
fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>
Convert
Rc<Trait>
(where Trait: Downcast
) to Rc<Any>
. Rc<Any>
can then be
further downcast
into Rc<ConcreteType>
where ConcreteType
implements Trait
.source§fn as_any(&self) -> &(dyn Any + 'static)
fn as_any(&self) -> &(dyn Any + 'static)
Convert
&Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &Any
’s vtable from &Trait
’s.source§fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
Convert
&mut Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &mut Any
’s vtable from &mut Trait
’s.