Trait wayland_backend::sys::client::ObjectData

pub trait ObjectData: DowncastSync {
    fn event(
        self: Arc<Self>, 
        backend: &Backend, 
        msg: Message<ObjectId>
    ) -> Option<Arc<dyn ObjectData>>;
    fn destroyed(&self, object_id: ObjectId);

    fn debug(&self, f: &mut Formatter<'_>) -> Result { ... }
}

Available on (test or crate feature client_system or crate feature server_system) and crate feature client_system only.

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

fn event(
    self: Arc<Self>,
    backend: &Backend,
    msg: Message<ObjectId>
) -> Option<Arc<dyn ObjectData>>

Dispatch an event for the associated object

If the event has a NewId argument, the callback must return the object data for the newly created object

fn destroyed(&self, object_id: ObjectId)

Notification that the object has been destroyed and is no longer active

Provided Methods

fn debug(&self, f: &mut Formatter<'_>) -> Result

Helper for forwarding a Debug implementation of your ObjectData type

By default will just print ObjectData { ... }

Implementations

impl dyn ObjectData

pub fn is<__T: ObjectData>(&self) -> bool

Returns true if the trait object wraps an object of type __T.

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.

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.

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.

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.

pub fn downcast_arc<__T: ObjectData>(
    self: Arc<Self>
) -> Result<Arc<__T>, Arc<Self>> where
    __T: Any + Send + Sync, 

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.

Trait Implementations

impl Debug for dyn ObjectData

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

Implementors