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Add downcast_ref to AnyViewHandle

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I use unsafe code to transmute an AnyViewHandle to a ViewHandle<T> when
the type matches. Because ViewHandle<T> is repr(transparent) to the
wrapped AnyViewHandle, this is safe.
This commit is contained in:
Nathan Sobo 2023-04-02 16:10:16 -06:00
parent 71cf6ec5ae
commit 138aa0492a
4 changed files with 15 additions and 12 deletions
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9
crates/gpui/src/app.rs
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@ -4661,6 +4661,7 @@ impl<T> Clone for WeakModelHandle<T> {
impl<T> Copy for WeakModelHandle<T> {}
#[repr(transparent)]
pub struct ViewHandle<T> {
any_handle: AnyViewHandle,
view_type: PhantomData<T>,
@ -4877,6 +4878,14 @@ impl AnyViewHandle {
}
}
pub fn downcast_ref<T: View>(&self) -> Option<&ViewHandle<T>> {
if self.is::<T>() {
Some(unsafe { mem::transmute(self) })
} else {
None
}
}
pub fn downgrade(&self) -> AnyWeakViewHandle {
AnyWeakViewHandle {
window_id: self.window_id,