pub trait ObjectData: DowncastSync {
// Required methods
fn event(
self: Arc<Self>,
backend: &Backend,
msg: Message<ObjectId, OwnedFd>,
) -> Option<Arc<dyn ObjectData>>;
fn destroyed(&self, object_id: ObjectId);
// Provided methods
fn debug(&self, f: &mut Formatter<'_>) -> Result { ... }
fn data_as_any(&self) -> &dyn Any { ... }
}
Expand description
A trait representing your data associated to an object
You will only be given access to it as a &
reference, so you
need to handle interior mutability by yourself.
The methods of this trait will be invoked internally every time a new object is created to initialize its data.
Required Methods§
Provided Methods§
sourcefn debug(&self, f: &mut Formatter<'_>) -> Result
fn debug(&self, f: &mut Formatter<'_>) -> Result
Helper for forwarding a Debug implementation of your ObjectData
type
By default will just print ObjectData { ... }
sourcefn data_as_any(&self) -> &dyn Any
fn data_as_any(&self) -> &dyn Any
Helper for accessing user data
This function is used to back the Proxy::data()
function in wayland_client
. By default,
it returns self
(via [Downcast
][downcast_rs::DowncastSync]), but this may be overridden to allow downcasting user data
without needing to have access to the full type.
Implementations§
source§impl dyn ObjectData
impl dyn ObjectData
sourcepub fn is<__T: ObjectData>(&self) -> bool
pub fn is<__T: ObjectData>(&self) -> bool
Returns true if the trait object wraps an object of type __T
.
sourcepub fn downcast<__T: ObjectData>(self: Box<Self>) -> Result<Box<__T>, Box<Self>>
pub fn downcast<__T: ObjectData>(self: Box<Self>) -> Result<Box<__T>, Box<Self>>
Returns a boxed object from a boxed trait object if the underlying object is of type
__T
. Returns the original boxed trait if it isn’t.
sourcepub fn downcast_rc<__T: ObjectData>(self: Rc<Self>) -> Result<Rc<__T>, Rc<Self>>
pub fn downcast_rc<__T: ObjectData>(self: Rc<Self>) -> Result<Rc<__T>, Rc<Self>>
Returns an Rc
-ed object from an Rc
-ed trait object if the underlying object is of
type __T
. Returns the original Rc
-ed trait if it isn’t.
sourcepub fn downcast_ref<__T: ObjectData>(&self) -> Option<&__T>
pub fn downcast_ref<__T: ObjectData>(&self) -> Option<&__T>
Returns a reference to the object within the trait object if it is of type __T
, or
None
if it isn’t.
sourcepub fn downcast_mut<__T: ObjectData>(&mut self) -> Option<&mut __T>
pub fn downcast_mut<__T: ObjectData>(&mut self) -> Option<&mut __T>
Returns a mutable reference to the object within the trait object if it is of type
__T
, or None
if it isn’t.
sourcepub fn downcast_arc<__T: ObjectData + Any + Send + Sync>(
self: Arc<Self>,
) -> Result<Arc<__T>, Arc<Self>>
pub fn downcast_arc<__T: ObjectData + Any + Send + Sync>( self: Arc<Self>, ) -> Result<Arc<__T>, Arc<Self>>
Returns an Arc
-ed object from an Arc
-ed trait object if the underlying object is of
type __T
. Returns the original Arc
-ed trait if it isn’t.