Flutter 按行/列中其他窗口小部件的大小调整行/列中窗口小部件的大小
我想用同一行/列的另一个小部件的最小大小来调整行/列中的小部件的大小 例如:Flutter 按行/列中其他窗口小部件的大小调整行/列中窗口小部件的大小,flutter,Flutter,我想用同一行/列的另一个小部件的最小大小来调整行/列中的小部件的大小 例如: class Example extends StatelessWidget { @override Widget build(BuildContext context) { return Align( alignment: Alignment.topCenter, child: FittedBox( child: Column( childre
class Example extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Align(
alignment: Alignment.topCenter,
child: FittedBox(
child: Column(
children: [
LongWidget(),
FlatButton(child: Text("flat button"),
color: Colors.red,
onPressed: () {},
),
],
),
),
);
}
}
现在看起来是这样的:
我想将按钮的大小调整为长部件的大小。我尝试了
Expanded
和CrossAxisAlignment.Stretch
但两者都破坏了列您可以复制粘贴运行下面的完整代码您可以使用
IntrinsicWidth
并设置FlatButton
的minWidth:double.infinity
代码片段
return Align(
alignment: Alignment.topCenter,
child: IntrinsicWidth(
child: Column(
children: [
Text("long" * 12),
FlatButton(
minWidth: double.infinity,
child: Text("flat button"),
color: Colors.red,
onPressed: () {},
),
],
),
),
);
工作演示
完整代码
import 'package:flutter/material.dart';
class Example extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Align(
alignment: Alignment.topCenter,
child: IntrinsicWidth(
child: Column(
children: [
Text("long" * 12),
FlatButton(
minWidth: double.infinity,
child: Text("flat button"),
color: Colors.red,
onPressed: () {},
),
],
),
),
);
}
}
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: "test",),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _incrementCounter() {
setState(() {
_counter++;
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Example(),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}
导入“包装:颤振/材料.省道”;
类示例扩展了无状态小部件{
@凌驾
小部件构建(构建上下文){
返回对齐(
对齐:alignment.topCenter,
子:内部宽度(
子:列(
儿童:[
文本(“长”*12),
扁平按钮(
minWidth:double.infinity,
子项:文本(“平面按钮”),
颜色:颜色,红色,
按下:(){},
),
],
),
),
);
}
}
void main(){
runApp(MyApp());
}
类MyApp扩展了无状态小部件{
@凌驾
小部件构建(构建上下文){
返回材料PP(
标题:“颤振演示”,
主题:主题资料(
主样本:颜色。蓝色,
视觉密度:视觉密度。自适应平台密度,
),
主页:我的主页(标题:“测试”),
);
}
}
类MyHomePage扩展StatefulWidget{
MyHomePage({Key,this.title}):超级(Key:Key);
最后的字符串标题;
@凌驾
_MyHomePageState createState()=>\u MyHomePageState();
}
类_MyHomePageState扩展状态{
int _计数器=0;
void _incrementCounter(){
设置状态((){
_计数器++;
});
}
@凌驾
小部件生成(BuildContext上下文){
返回脚手架(
appBar:appBar(
标题:文本(widget.title),
),
正文:中心(
子栏(
mainAxisAlignment:mainAxisAlignment.center,
儿童:[
示例(),
],
),
),
浮动操作按钮:浮动操作按钮(
按下时:\ u递增计数器,
工具提示:“增量”,
子:图标(Icons.add),
),
);
}
}