addListener method

  1. @override
void addListener(
  1. VoidCallback listener
)
override

Register a closure to be called when the object notifies its listeners.

Implementation

@override
void addListener(VoidCallback listener) {
  bool first = true;
  _listeners.putIfAbsent(listener, () {
    return subscribe((_) {
      if (runCallbackOnListen) {
        listener();
      } else {
        if (!first) listener();
        first = false;
      }
    });
  });
}