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Counter example
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// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file | |
// for details. All rights reserved. Use of this source code is governed by a | |
// BSD-style license that can be found in the LICENSE file. | |
import 'package:flutter/material.dart'; | |
void main() => runApp(MyApp()); | |
class MyApp extends StatelessWidget { | |
@override | |
Widget build(BuildContext context) { | |
return MaterialApp( | |
title: 'Flutter Demo', | |
debugShowCheckedModeBanner: false, | |
theme: ThemeData( | |
primarySwatch: Colors.blue, | |
), | |
home: const MyHomePage(title: 'Flutter Demo Home Page'), | |
); | |
} | |
} | |
class MyHomePage extends StatefulWidget { | |
final String title; | |
const MyHomePage({ | |
Key? key, | |
required this.title, | |
}) : super(key: key); | |
@override | |
State<MyHomePage> createState() => _MyHomePageState(); | |
} | |
class _MyHomePageState extends State<MyHomePage> { | |
int _counter = 0; | |
@override | |
Widget build(BuildContext context) { | |
return Scaffold( | |
body: Center( | |
child: TextButton( | |
onPressed: () => setState(() => _counter++), | |
child: Text( | |
'カウンターの値 → $_counter', | |
style: Theme.of(context).textTheme.headline4, | |
), | |
), | |
), | |
); | |
} | |
} |
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