Flutter——Expanded组件（"可伸缩"组件）

import ‘package:flutter/material.dart‘;

void main() {
  runApp(MaterialApp(
    title: "ExpandedWidget",
    home: MyApp(),
  ));
}


class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Row(
          mainAxisAlignment: MainAxisAlignment.start,
          children: <Widget>[
            Container(
              color: Colors.orange,
              width: 80,
              height: 80,
            ),
            Expanded(
              flex: 1,
              child: Container(
                color: Colors.redAccent,
                width: 80,
                height: 80,
              ),
            ),
            Expanded(
              flex: 2,
              child: Container(
                color: Colors.teal,
                width: 80,
                height: 80,
              ),
            )
          ],
        ),
    );
  }
}