OneOffEventListener<T> constructor

OneOffEventListener<T>(EventCallback<T> onEvent)

Used by EventRule for triggering onEvent callback.

A type of EventListener which only calls its onEvent one time.

Example

final event1 = Event<int>("int");

EventRule<int>(event1, targets: [

  // On Receiving `event1` call `onEvent`
  // with `payload` of type [int]
  OneOffEventListener(
    (payload) {
      print("integer event: $payload");
    },
  ),
]);


....

// Release Event
EventBus.emit(event1.createPayload(100)) // prints "integer event: 100"
EventBus.emit(event1.createPayload(100)) // nothing happens
EventBus.emit(event1.createPayload(100)) // nothing happens

See Also:

• EventListener : An EventListener which calls its onEvent.
• DebouncedEventListener : An EventListenr which delays its calls to prevent frequent calls.

Implementation

OneOffEventListener(EventCallback<T> onEvent) : super(onEvent);