简介
一个特定大小的窗口小部件,将其原始约束传递给其子节点,可能会溢出。
基本用法
alignment:对齐
size: 设置部件大小
ex:为方便看效果,现设置幕布大小为(Container)200*50。图一
ex:图一,基础上添加一个不设置size属性的SizeOverflowBox。图二
ex:图二,添加size属性,100*20,图三
ex:图三,添加 alignment: Alignment.center,
实例演示
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
class SizeOverflowBoxDefault extends StatelessWidget {
final double curSizeWidth;
final double curSizeHeight;
final String text;
SizeOverflowBoxDefault(
{Key key, this.curSizeWidth, this.curSizeHeight, this.text})
: super(key: key);
@override
Widget build(BuildContext context) {
return SizedOverflowBox(
size: Size(curSizeWidth, curSizeHeight),
alignment: Alignment.centerRight,
//size属性设置了大小,container 里面的大小失效,
child: Container(
color: Color(0xfff06292),
width: 50.0,
height: 50.0,
child: Text(
text,
style: TextStyle(color: Colors.white),
),
),
);
}
}
class SizeBoxDefault extends StatelessWidget {
final double curWidth;
final double curHeight;
SizeBoxDefault({Key key, this.curHeight, this.curWidth}) : super(key: key);
@override
Widget build(BuildContext context) {
return SizedBox(
width: curWidth,
height: curHeight,
child: const Card(
child: Text(
'SizedBox',
style: TextStyle(color: Colors.white),
textDirection: TextDirection.rtl,
),
color: Color(0xfff06292),
),
);
}
}