Struct CallbackEmitter

pub struct CallbackEmitter<T = ()> { /* private fields */ }

A Callback emitter.

This is used to store a list of callbacks and call them all. All the callbacks are weak, so they must be kept alive by the user.

Implementations

impl<T> CallbackEmitter<T>

pub fn new() -> Self

Creates an empty callback emitter.

pub fn len(&self) -> usize

Returns the number of callbacks, valid or not.

pub fn is_empty(&self) -> bool

Returns true if there are no callbacks.

pub fn downgrade(&self) -> WeakCallbackEmitter<T>

Downgrades the callback emitter to a WeakCallbackEmitter.

pub fn subscribe(&self, callback: &Callback<'_, T>)

Subscribes a callback to the emitter.

The reference to the callback is weak, and will therefore not keep the callback alive. If the callback is dropped, it will be removed from the emitter.

pub fn subscribe_weak(&self, callback: WeakCallback<T>)

Subscribes a weak callback to the emitter.

pub fn unsubscribe(&self, ptr: *const RefCell<dyn FnMut(&T) + 'static>)

Unsubscribes a callback from the emitter.

pub fn emit(&self, event: &T)

Clears all the callbacks, and calls them.

impl CallbackEmitter

pub fn track(&self)

Tracks self in the current effect.

Trait Implementations

impl<T> Clone for CallbackEmitter<T>

fn clone(&self) -> Self

Returns a duplicate of the value.

const fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T> Default for CallbackEmitter<T>

fn default() -> Self

Returns the “default value” for a type.