第7章页面布局-Container容器布局

防采集标记：亢少军老师的课程和资料

import 'package:flutter/material.dart';

void main() => runApp(
      new MaterialApp(
        title: 'Container布局容器示例',
        home: new LayoutDemo(),
      ),
    );

class LayoutDemo extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    //返回一个Container对象
    Widget container = new Container(
      //添加装饰效果
      decoration: new BoxDecoration(
        color: Colors.grey,
      ),
      //子元素指定为一个垂直水平嵌套布局的组件
      child: new Column(
        children: [
          new Row(
            children: [
              //使用Expanded防止内容溢出
              new Expanded(
                child: new Container(
                  width: 150.0,
                  height: 150.0,
                  //添加边框样式
                  decoration: new BoxDecoration(
                    //上下左右边框设置为宽度10.0 颜色为蓝灰色
                    border: new Border.all(width: 10.0, color: Colors.blueGrey),
                    //上下左右边框弧度设置为8.0
                    borderRadius:
                        const BorderRadius.all(const Radius.circular(8.0)),
                  ),
                  //上下左右增加边距
                  margin: const EdgeInsets.all(4.0),
                  //添加图片
                  child: new Image.asset('images/1.jpeg'),
                ),
              ),
              new Expanded(
                child: new Container(
                  width: 150.0,
                  height: 150.0,
                  decoration: new BoxDecoration(
                    border: new Border.all(width: 10.0, color: Colors.blueGrey),
                    borderRadius:
                        const BorderRadius.all(const Radius.circular(8.0)),
                  ),
                  margin: const EdgeInsets.all(4.0),
                  child: new Image.asset('images/2.jpeg'),
                ),
              ),
            ],
          ),
          new Row(
            children: [
              new Expanded(
                child: new Container(
                  width: 150.0,
                  height: 150.0,
                  decoration: new BoxDecoration(
                    border: new Border.all(width: 10.0, color: Colors.blueGrey),
                    borderRadius:
                        const BorderRadius.all(const Radius.circular(8.0)),
                  ),
                  margin: const EdgeInsets.all(4.0),
                  child: new Image.asset('images/3.jpeg'),
                ),
              ),
              new Expanded(
                child: new Container(
                  width: 150.0,
                  height: 150.0,
                  decoration: new BoxDecoration(
                    border: new Border.all(width: 10.0, color: Colors.blueGrey),
                    borderRadius:
                        const BorderRadius.all(const Radius.circular(8.0)),
                  ),
                  margin: const EdgeInsets.all(4.0),
                  child: new Image.asset('images/2.jpeg'),
                ),
              ),
            ],
          ),
        ],
      ),
    );

    return new Scaffold(
      appBar: new AppBar(
        title: new Text('Container布局容器示例'),
      ),
      body: container,
    );
  }
}

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@作者: 亢少军