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| class CustomProvider<T extends Listenable> extends StatefulWidget {
final T Function() create;
final Widget child;
const CustomProvider({Key? key, required this.child, required this.create}) : super(key: key);
@override
State<CustomProvider> createState() => _CustomState<T>();
static T of<T>(BuildContext context,{bool listen = true}) {
if(listen) {
return context.dependOnInheritedWidgetOfExactType<CustomInheritedWidget<T>>()!.model;
} else {
return (context.getElementForInheritedWidgetOfExactType<CustomInheritedWidget<T>>()!.widget as CustomInheritedWidget).model;
}
}
}
class _CustomState<T extends Listenable> extends State<CustomProvider<T>> {
late T model;
@override
void initState() {
super.initState();
model = widget.create();
}
@override
Widget build(BuildContext context) {
return AnimatedBuilder(
animation: model,
builder: (BuildContext context, Widget? child) {
return CustomInheritedWidget(model: model,
child: widget.child);
},
);
}
}
class CustomInheritedWidget<T> extends InheritedWidget {
final T model;
const CustomInheritedWidget({super.key, required this.model,required super.child});
static CustomInheritedWidget of<T>(BuildContext context) {
return context.dependOnInheritedWidgetOfExactType<CustomInheritedWidget<T>>()!;
}
@override
bool updateShouldNotify(covariant InheritedWidget oldWidget) {
print("update");
return true;
}
}
extension Consumer on BuildContext {
T watch<T>() => CustomProvider.of(this);
T read<T>() => CustomProvider.of(this,listen: false);
}
|