Flutter mixin composition example

flutter_mixin_composition.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Mixin Composition',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key}) : super(key: key);

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

class _MyHomePageState extends State<MyHomePage> with DialogMixin, LocationMixin {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Mixin Composition'),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _checkLocation,
        tooltip: 'Check Location',
        child: const Icon(Icons.my_location_outlined),
      ),
    );
  }

  void _checkLocation() {
    check();
  }
}

mixin DialogMixin {
  void show() {
    print('Show dialog');
  }
}

mixin LocationMixin<T extends StatefulWidget> on State<T>, DialogMixin {
  void check() {
    show();
  }
}