dispose method Null safety

  1. @mustCallSuper
  2. @override
void dispose()
@mustCallSuper, override

Discards any resources used by the object. After this is called, the object is not in a usable state and should be discarded (calls to addListener and removeListener will throw after the object is disposed).

This method should only be called by the object's owner.


void dispose() {
  _isDisposed = true;