Flutter - InheritedWidget - dispose

Question

I was wondering if anybody knew a way to know when an InheritedWidget was disposed?

The reason of this question is that I am doing some experiments and I am using an

Answer 1

InheritedWidget behaves the same way as other Widget do. Their lifetime is really short: Usually not longer than one build call.

If you want to store data for longer, InheritedWidget is not what you want. You'll need a State for that.

Which also means that ultimately, you can use State's dispose for your bloc dispose.

class BlocHolder extends StatefulWidget {
  final Widget child;

  BlocHolder({this.child});

  @override
  _BlocHolderState createState() => _BlocHolderState();
}

class _BlocHolderState extends State {
  final _bloc = new MyBloc();

  @override
  Widget build(BuildContext context) {
    return MyInherited(bloc: _bloc, child: widget.child,);
  }


  @override
  void dispose() {
    _bloc.dispose();
    super.dispose();
  }
}

class MyInherited extends InheritedWidget {
  final MyBloc bloc;

  MyInherited({this.bloc, Widget child}): super(child: child);

  @override
  bool updateShouldNotify(InheritedWidget oldWidget) {
    return oldWidget != this;
  }
}


class MyBloc {
  void dispose() {

  }
}