Struct Event 

pub struct Event<A>
where
    A: ?Sized,
{ /* private fields */ }

A multicast event of a model object: the equivalent of a managed event member on a type that is not part of the class hierarchy.

Handlers are identified by the token returned from add. Raising works on a snapshot, so handlers may add or remove handlers.

Implementations

impl<A> Event<A>

where A: ?Sized,

pub fn new() -> Event<A>

pub fn with_shared_ids(ids: Rc<Cell<u64>>) -> Event<A>

An event whose handler tokens come from ids, a counter shared with other handler lists (see HandlerList::with_shared_ids).

pub fn with_ordered_ids() -> Event<A>

An event whose handler tokens come from the counter of the process (see HandlerList::with_ordered_ids).

pub fn snapshot(&self) -> HandlerSnapshot<dyn Fn(&A)>

The current handlers with their tokens; later changes do not affect it.

pub fn add(&self, handler: Rc<dyn Fn(&A)>) -> u64

Adds a handler; returns the token that removes it.

pub fn remove(&self, token: u64) -> bool

Removes a handler. Returns false if the token is unknown.

pub fn has_handlers(&self) -> bool

Whether any handler is subscribed.

pub fn handler_count(&self) -> usize

The number of subscribed handlers.

pub fn raise(&self, args: &A)

Invokes the handlers.

Trait Implementations

impl<A> Default for Event<A>

where A: ?Sized,

fn default() -> Event<A>

Returns the “default value” for a type.