import 'package:flutter/material.dart';

// Define the InheritedWidget
class CounterProvider extends InheritedWidget {
  final int counter;
  final Function() increment;

  CounterProvider({
    Key? key,
    required this.counter,
    required this.increment,
    required Widget child,
  }) : super(key: key, child: child);

  // Method to easily access the counter and increment method
  static CounterProvider? of(BuildContext context) {
    return context.dependOnInheritedWidgetOfExactType<CounterProvider>();
  }

  @override
  bool updateShouldNotify(CounterProvider oldWidget) {
    return counter != oldWidget.counter;
  }
}

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('InheritedWidget Example')),
        body: CounterProvider(
          counter: 0,
          increment: () {},
          child: HomeScreen(),
        ),
      ),
    );
  }
}

class HomeScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final provider = CounterProvider.of(context);

    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        Text('Counter: ${provider?.counter}'),
        ElevatedButton(
          onPressed: provider?.increment,
          child: Text('Increment'),
        ),
      ],
    );
  }
}

import 'package:flutter/material.dart';

// Define the InheritedModel
class MyModel extends InheritedModel<String> {
  final int counter;

  MyModel({
    Key? key,
    required this.counter,
    required Widget child,
  }) : super(key: key, child: child);

  // Method to access the model
  static MyModel? of(BuildContext context, String aspect) {
    return InheritedModel.inheritFrom<MyModel>(context, aspect: aspect);
  }

  @override
  bool updateShouldNotify(InheritedModel<String> oldWidget) {
    return counter != (oldWidget as MyModel).counter;
  }

  @override
  bool updateShouldNotifyDependent(
      InheritedModel<String> oldWidget, Set<String> aspects) {
    final oldModel = oldWidget as MyModel;
    return aspects.contains('counter') && counter != oldModel.counter;
  }
}

void main() {
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  int _counter = 0;

  void _increment() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('InheritedModel Example')),
        body: MyModel(
          counter: _counter,
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              CounterText(),
              ElevatedButton(
                onPressed: _increment,
                child: Text('Increment'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

class CounterText extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final model = MyModel.of(context, 'counter');

    return Text('Counter: ${model?.counter}');
  }
}