Counter app with provider - complex version

counter_app_complex.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 ChangeNotifierProvider<Counter>( // <=== PROVIDER
      builder: (context) => Counter(),
      child: MaterialApp(
        title: 'Counter App - Complex',
        home: MyPage(),
      ),
    );
  }
}

class MyPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Page Title"),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Consumer<Counter>( // <=== DEPENDENT
              builder: (context, counter, child) => Text(
                '${counter.count}',
                style: Theme.of(context).textTheme.display1,
              ),
            ),
            IncrementButton(), // <=== DEPENDENT
          ],
        ),
      ),
    );
  }
}

class IncrementButton extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final counter = Provider.of<Counter>(context, listen: false);
    return RaisedButton(
      onPressed: () => counter.increment(),
      child: Text("Increment"),
    );
  }
}

class Counter with ChangeNotifier {
  int count = 0;

  void increment() {
    ++count;
    notifyListeners();
  }
}