Counter App using a ChangeNotifier Mixin

counter_listenable.dart

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

import 'impl_change_notifier_mixin.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});
  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage>
    with ImplNotifyListenersChangeNotifierMixin {
  //
  int _counter = 0;

  @override
  void dispose() {
    disposeChangeNotifier();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) => Scaffold(
        appBar: AppBar(
          backgroundColor: Theme.of(context).colorScheme.inversePrimary,
          title: Text(widget.title),
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              const Text(
                'You have pushed the button this many times:',
              ),
              setBuilder(
                (context) => Text(
                  '$_counter',
                  style: Theme.of(context).textTheme.headlineMedium,
                ),
              ),
            ],
          ),
        ),
        floatingActionButton: FloatingActionButton(
          onPressed: () {
            _counter++;
            notifyListeners();
          },
          tooltip: 'Increment',
          child: const Icon(Icons.add),
        ),
      );
}