sendNotify method

Implementation

void sendNotify({List<String>? keys}) {
  if (keys != null) {
    for (var listenerKey in keys) {
      var listener = listeners[listenerKey];
      if (listener != null) {
        listener();
      }
    }
  } else {
    listeners.forEach((key, value) {
      value();
    });
  }
}