Expanded Widget

Flutter布局的时候基本都使用行和列,基本都是按照相同比列进行排列显示的.如果想让其中一个拉伸并填充余下的空间,只需要在子控件外加上Expanded即可.
设置fix可以增加子控件的权重.


import 'package:flutter/material.dart';class GoogleExpand extends StatelessWidget {@overrideWidget build(BuildContext context) {return Column(children: <Widget>[Row(children: <Widget>[Container(width: 50.0,height: 50.0,color: Colors.green,),Expanded(flex: 1,child: Container(width: 50.0,height: 50.0,color: Colors.red,child: Text('flex: 1'),),),Container(width: 50.0,height: 50.0,color: Colors.orange,),],),SizedBox(height: 20.0,),Row(children: <Widget>[Container(width: 50.0,height: 50.0,color: Colors.green,),Expanded(flex: 2,child: Container(width: 50.0,height: 50.0,color: Colors.red,child: Text('flex: 2'),),),Container(width: 50.0,height: 50.0,color: Colors.orange,),Expanded(flex: 1,child: Container(width: 50.0,height: 50.0,color: Colors.blue,child: Text('flex: 1'),),),],)],);}
}

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代码github

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