listen<T extends Event> method

void listen<T extends Event>(
  1. Future<void> handler(
    1. T
    )
)

Implementation

void listen<T extends Event>(Future<void> Function(T) handler) {
	if (_eventHandlers[T] == null) _eventHandlers[T] = <Function>[];
	if (!_eventHandlers[T]!.contains(handler)) _eventHandlers[T]!.add(handler);
}