scoped inherited widget

main.dart

class _Type implements Type {
  _Type(this.key);

  final Object key;

  @override
  operator ==(Object other) => other is _Type && other.key == key;

  @override
  int get hashCode => key.hashCode;
}

class ScopedInheritedWidget extends InheritedWidget {
  ScopedInheritedWidget({Key key, Object scope, Widget child})
      : _scope = scope,
        super(key: key, child: child);

  static ScopedInheritedWidget of(BuildContext context, {Object scope}) {
    final targetType = scope != null ? _Type(scope) : ScopedInheritedWidget;
    return context.inheritFromWidgetOfExactType(targetType) as ScopedInheritedWidget;
  }

  final Object _scope;

  @override
  Type get runtimeType => _scope != null ? _Type(_scope) : super.runtimeType;

  @override
  bool updateShouldNotify(InheritedWidget oldWidget) {
    // TODO: implement updateShouldNotify
    return null;
  }
}