constructor BroadcastStreamController

Source

BroadcastStreamController([
  void onStartListen(),
  void onAllCancel(),
  void onListen(callback(T value)),
  bool sync = false
]) {
  _controller = new StreamController<T>(sync: sync);
  _stream = new CachedStreamWrapper(
      _controller.stream
          .asBroadcastStream(onListen: _onListen, onCancel: _onCancel),
      onListen);
  this.onStartListen = onStartListen;
  this.onAllCancel = onAllCancel;
}