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import 'package:flutter/material.dart'; | |
/////////////////////////////// | |
// ① Main:Flutterアプリもmain()からコードが実行されます。 | |
// `void main() => runApp(MyApp());` でも意味は同じです。 | |
void main() { | |
return runApp(MyApp()); | |
} | |
/////////////////////////////// | |
// ② アプリの基盤:アプリのテーマやスタイルを設定する。その上のページを追加していく。 | |
class MyApp extends StatelessWidget { | |
@override | |
Widget build(BuildContext context) { | |
// MaterialAppという形式のアプリを作成 | |
return MaterialApp( | |
theme: ThemeData(), // アプリのテーマカラーなど詳細を入力 | |
home: MyHomePage(), // メインページを作成 | |
); | |
} | |
} | |
/////////////////////////////// | |
// ③ アプリのメインページ(固定) | |
class MyHomePage extends StatelessWidget { | |
@override | |
Widget build(BuildContext context) { | |
return Scaffold( | |
appBar: AppBar( | |
title: Text("Menu Bar"), | |
), | |
body: Center( | |
child: ListView(children: [ | |
TodoCardWidget(label: "TODO 1"), | |
TodoCardWidget(label: "TODO 2"), | |
TodoCardWidget(label: "TODO 3"), | |
TodoCardWidget(label: "TODO 4"), | |
]), | |
), | |
); | |
} | |
} | |
//////////////////// | |
/// ⑤ StatefulWidget本体 | |
class TodoCardWidget extends StatefulWidget { | |
final String label; | |
var state = false; | |
TodoCardWidget({Key? key, required this.label}) : super(key: key); | |
@override | |
_TodoCardWidgetState createState() => _TodoCardWidgetState(); | |
} | |
/// ⑥ TodoCardWidgetの状態 | |
class _TodoCardWidgetState extends State<TodoCardWidget> { | |
void _changeState(value) { | |
setState(() { | |
widget.state = value ?? false; | |
}); | |
} | |
@override | |
Widget build(BuildContext context) { | |
return Card( | |
margin: EdgeInsets.all(10), | |
child: Container( | |
padding: EdgeInsets.all(10), | |
child: Row( | |
children: [ | |
Checkbox(onChanged: _changeState, value: widget.state), | |
Text(widget.label), | |
], | |
), | |
), | |
); | |
} | |
} |
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