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compositor: add missing token method

This commit is contained in:
Victor Berger 2017-09-05 12:05:42 +02:00
parent 5c46ba73e9
commit 70f7b19940
1 changed files with 17 additions and 0 deletions
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17
src/compositor/mod.rs
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@ -434,6 +434,23 @@ impl<U: Send + 'static, R: Send + RoleType + 'static, H: Handler<U, R> + Send +
unsafe { SurfaceData::<U, R>::give_role_with::<RoleData>(surface, data) } unsafe { SurfaceData::<U, R>::give_role_with::<RoleData>(surface, data) }
} }
/// Access the role data of a surface
///
/// Fails and don't call the closure if the surface doesn't have this role
///
/// If the surface is not managed by the CompositorGlobal that provided this token, this
/// will panic (having more than one compositor is not supported).
pub fn with_role_data<RoleData, F, T>(&self, surface: &wl_surface::WlSurface, f: F) -> Result<T, WrongRole>
where
R: Role<RoleData>,
F: FnOnce(&mut RoleData) -> T
{
assert!(
resource_is_registered::<_, CompositorHandler<U, R, H>>(surface, self.hid),
"Accessing the data of foreign surfaces is not supported."
);
unsafe { SurfaceData::<U, R>::with_role_data::<RoleData, _, _>(surface, f) }
}
/// Register that this surface does not have a role any longer and retrieve the data /// Register that this surface does not have a role any longer and retrieve the data
/// ///