How to combine enum and switch statements to reuse an entire screen widget in flutter- #100DaysOfCode - Day 16

class FarmerListScreen extends StatefulWidget {
  static String routeName = 'AllFarmerScreen';
  final LocationFilter filter;
  const FarmerListScreen({
    this.filter: LocationFilter.all,
    Key? key,
  }) : super(key: key);

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

class _FarmerListScreenController extends State<FarmerListScreen> {
  @override
  Widget build(BuildContext context) => _FarmerListScreenView(this);
  late Stream<QuerySnapshot<FarmerServiceModel>> stream;

  @override
  void initState() {
    super.initState();
    switch (widget.filter) {
      case LocationFilter.region:
        stream = RegionFarmerCommand(context).run();
        break;
      case LocationFilter.district:
        stream = DistrictFarmerCommand(context).run();
        break;
      default:
        stream = AllFarmerCommand(context).run();
        break;
    }
  }

String getScreenTitle() {
    var title = ' Farmer Register';
    switch (widget.filter) {
      case LocationFilter.district:
        return Provider.of<UserModel>(context).currentUser.district + title;

      case LocationFilter.region:
        return Provider.of<UserModel>(context).currentUser.region + title;
      default:
        return title;
    }
  }