onClose method

@override @mustCallSuper void onClose()

Closes the instance. This method should be called when the instance is no longer needed. Once onClose is called, the instance can no longer be used.

Implementation

@override
@mustCallSuper
void onClose() {
  // ignore: invalid_use_of_protected_member
  Controller.observer.onClose(this);
  _stateController.close();
  super.onClose();
}