【 Flutter 】Flutter を 基礎 から 学習 ( ウィジェット編 ) part51 Multi-child layout widgets

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

void main() {
  runApp(new MaterialApp(home: new MyApp()));
}

class MyApp extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return _State();
  }
}

class _State extends State<MyApp> {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('テスト中です。'),
        ),
        body: Container(
          alignment: Alignment.center,
          width: 100,
          child: Column(
            children: <Widget>[
              box(),
              Expanded(
                child: Container(
                  width: 100,
                  height: 200,
                  child: DecoratedBox(
                    decoration: BoxDecoration(color: Colors.red),
                  ),
                ),
                flex: 1,
              ),
              Expanded(
                child: Container(
                  width: 100,
                  height: 200,
                  child: DecoratedBox(
                    decoration: BoxDecoration(color: Colors.indigo),
                  ),
                ),
                flex: 2,
              ),
            ],
          ),
        ),
      ),
    );
  }

  Widget box({
    Color color = Colors.green,
    Alignment alignment = Alignment.center,
  }) {
    return Align(
        alignment: alignment,
        child: SizedBox(
            width: 100,
            height: 100,
            child: DecoratedBox(
              decoration: BoxDecoration(
                color: color,
              ),
            )));
  }
}