controller.dart

import "package:flutter/material.dart";

abstract class Controller extends ChangeNotifier {
  static T ofType<T extends Controller>(BuildContext context) {
    return context
        .dependOnInheritedWidgetOfExactType<_ControllerModel<T>>()!
        .controller;
  }

  static T? maybeOfType<T extends Controller>(BuildContext context) {
    return context
        .dependOnInheritedWidgetOfExactType<_ControllerModel<T>>()
        ?.controller;
  }
}

class _ControllerModel<T> extends InheritedWidget {
  const _ControllerModel(
      {super.key, required super.child, required this.controller});

  final T controller;

  @override
  bool updateShouldNotify(_ControllerModel<T> oldWidget) {
    return oldWidget.controller != controller;
  }
}

class ControllerBuilder<T extends Controller> extends StatefulWidget {
  const ControllerBuilder(
      {super.key, required this.controller, required this.builder});

  final T controller;

  final Widget Function(BuildContext context) builder;

  @override
  State createState() => _ControllerBuilder<T>();
}

class _ControllerBuilder<T extends Controller>
    extends State<ControllerBuilder<T>> {
  late T controller = widget.controller;

  @override
  Widget build(BuildContext context) {
    return _ControllerModel<T>(
        controller: widget.controller,
        child: ListenableBuilder(
            listenable: controller,
            builder: (context, _) => widget.builder(context)));
  }
}

class ControllerProvider<T extends Controller> extends StatelessWidget {
  const ControllerProvider(
      {super.key, required this.controller, required this.child});

  final Widget child;
  final T controller;

  @override
  Widget build(BuildContext context) {
    return _ControllerModel<T>(controller: controller, child: this.child);
  }
}