Counter app implemented with provider and StatefulWidget

provider_state_counter.dart

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      home: MyHomePage(),
    );
  }
}

// Counter app with InheritedWidget

class MyHomePage extends StatelessWidget {
  Widget build(BuildContext context) {
    return CounterWidget(
      child: Scaffold(
        appBar: AppBar(
          title: Text("Page Title"),
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Consumer<int>(builder: (context, count, child) {
                return Text(
                  '$count',
                  style: Theme.of(context).textTheme.display1,
                );
              }),
              Consumer<CounterState>(builder: (context, counter, child) {
                return RaisedButton(
                  onPressed: () => counter.incrementCount(),
                  child: Text("Increment"),
                );
              }),
            ],
          ),
        ),
      ),
    );
  }
}

class CounterWidget extends StatefulWidget {
  CounterWidget({Key key, @required this.child}) : super(key: key);

  final Widget child;

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

class CounterState extends State<CounterWidget> {
  int count = 0;

  void incrementCount() {
    setState(() {
      ++count;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Provider.value(
      value: count,
      child: Provider.value(
        value: this,
        child: widget.child,
      ),
    );
  }
}