flutterの練習４：レスポンシブル
本家のサイトの続きをやっています。続きはレスポンシブルはLayout builderでやるとあります。ちょっと変えてできたのはこちら。
幅が６００よりも大きければ _buildWideContainers; 小さければ _buildNormalContainerが呼び出される仕組みです。
import 'package:flutter/material.dart';
void main() => runApp(const MyApp());
class MyApp extends StatelessWidget {
const MyApp({super.key});
static const String _title = 'Flutter Code Sample';
@override
Widget build(BuildContext context) {
return const MaterialApp(
title: _title,
home: MyStatelessWidget(),
);
}
}
class MyStatelessWidget extends StatelessWidget {
const MyStatelessWidget({super.key});
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: const Text('LayoutBuilder Example')),
body: LayoutBuilder(
builder: (BuildContext context, BoxConstraints constraints) {
if (constraints.maxWidth > 600) {
return _buildWideContainers();
} else {
return _buildNormalContainer();
}
},
),
);
}
Widget _buildNormalContainer() {
return Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Container(
height: 100.0,
width: 100.0,
color: Colors.red,
),
Container(
height: 100.0,
width: 100.0,
color: Colors.yellow,
),
Container(
height: 100.0,
width: 100.0,
color: Colors.blue,
),
],
),
);
}
Widget _buildWideContainers() {
return Center(
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Container(
height: 100.0,
width: 100.0,
color: Colors.amber,
),
Container(
height: 100.0,
width: 100.0,
color: Colors.green,
),
],
),
);
}
}