フォームでよくあるパーツまとめ
テキスト入力ボックス (TextField)
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: MyForm(),
);
}
}
class MyForm extends StatefulWidget {
@override
_MyFormState createState() => _MyFormState();
}
class _MyFormState extends State<MyForm> {
TextEditingController _textController = TextEditingController();
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Form Sample'),
),
body: Padding(
padding: const EdgeInsets.all(16.0),
child: Column(
children: [
TextField(
controller: _textController,
decoration: InputDecoration(labelText: '入力してください'),
),
SizedBox(height: 16),
ElevatedButton(
onPressed: () {
print(_textController.text);
},
child: Text('送信する'),
),
],
),
),
);
}
}
テキストエリア (TextField の maxLines を指定)
maxLinesを使用すると入力行増やせる
TextField(
maxLines: 3,
controller: _textController,
decoration: InputDecoration(labelText: 'Enter multi-line text'),
),
ラジオボタン (Radio)
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: MyRadioForm(),
);
}
}
class MyRadioForm extends StatefulWidget {
@override
_MyRadioFormState createState() => _MyRadioFormState();
}
class _MyRadioFormState extends State<MyRadioForm> {
String selectedValue = 'Option 1';
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Radio Form'),
),
body: Padding(
padding: const EdgeInsets.all(16.0),
child: Column(
children: [
RadioListTile(
title: Text('Option 1'),
value: 'Option 1',
groupValue: selectedValue,
onChanged: (value) {
setState(() {
selectedValue = value as String;
});
},
),
RadioListTile(
title: Text('Option 2'),
value: 'Option 2',
groupValue: selectedValue,
onChanged: (value) {
setState(() {
selectedValue = value as String;
});
},
),
],
),
),
);
}
}
トグルボタン (Switch)
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: MySwitchForm(),
);
}
}
class MySwitchForm extends StatefulWidget {
@override
_MySwitchFormState createState() => _MySwitchFormState();
}
class _MySwitchFormState extends State<MySwitchForm> {
bool isSwitched = false;
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Switch Form'),
),
body: Padding(
padding: const EdgeInsets.all(16.0),
child: Column(
children: [
Switch(
value: isSwitched,
onChanged: (value) {
setState(() {
isSwitched = value;
});
},
),
Text('Switch is ${isSwitched ? 'ON' : 'OFF'}'),
],
),
),
);
}
}