Flutter 颤振:如何使BoxShadow溢出兄弟小部件?
我有一个Flutter 颤振:如何使BoxShadow溢出兄弟小部件?,flutter,flutter-layout,Flutter,Flutter Layout,我有一个行,其中有两个扩展的小部件作为其子项。因此,子级之间没有空格/填充。每个子级都包含一个容器(带有方框装饰),而该容器又包含一个扁平按钮。当突出显示FlatButton时,容器周围会出现一个BoxShadow 对于第二个按钮,阴影看起来很好,溢出了第一个按钮的一部分。但是,当突出显示第一个按钮时,BoxShadow的右侧(应该位于第二个按钮上方)会被剪裁。我认为这是因为第二个按钮(及其各自的祖先)位于小部件树中第一个按钮之后,因此是“更高的” 下面是我制作的DartPad实例,用于演示该问
行
,其中有两个扩展的
小部件作为其子项。因此,子级之间没有空格/填充。每个子级都包含一个容器
(带有方框装饰),而该容器又包含一个扁平按钮
。当突出显示FlatButton
时,容器周围会出现一个BoxShadow
对于第二个按钮,阴影看起来很好,溢出了第一个按钮的一部分。但是,当突出显示第一个按钮时,BoxShadow
的右侧(应该位于第二个按钮上方)会被剪裁。我认为这是因为第二个按钮(及其各自的祖先)位于小部件树中第一个按钮之后,因此是“更高的”
下面是我制作的DartPad实例,用于演示该问题:
我的问题本质上是如何实现,在完全相同的布局下,即按钮之间没有空间,每个按钮的阴影出现在另一个按钮上。即示例中“Button1”的阴影与“Button2”的阴影相同
谢谢 您好,您可以检查编辑的代码
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
void main() {
runApp(new MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Generated App',
theme: new ThemeData(
primarySwatch: Colors.blue,
primaryColor: const Color(0xFF2196f3),
accentColor: const Color(0xFF2196f3),
canvasColor: const Color(0xFFfafafa),
),
home: new MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key}) : super(key: key);
@override
_MyHomePageState createState() => new _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('App Name'),
),
body: new Container(
child: Padding(
padding: EdgeInsets.symmetric(horizontal: 10),
child: Center(
child: new Row(
children: [
Expanded(
child: Container(
color: Colors.white,
child: Padding(
padding: const EdgeInsets.fromLTRB(0, 0, 5, 0),
child: Container(
decoration: BoxDecoration(boxShadow: [
BoxShadow(
color: Colors.transparent,
blurRadius: 5.0,
),
]),
child: TestButton("Button1")),
),
)),
Expanded(
child: Container(
color: Colors.white,
child: Padding(
padding: const EdgeInsets.fromLTRB(0, 0, 5, 0),
child: Container(
decoration: BoxDecoration(boxShadow: [
BoxShadow(
color: Colors.transparent,
blurRadius: 5.0,
),
]),
child: TestButton("Button2")),
),
))
],
mainAxisAlignment: MainAxisAlignment.start,
mainAxisSize: MainAxisSize.max,
crossAxisAlignment: CrossAxisAlignment.center,
))),
padding: const EdgeInsets.all(0.0),
alignment: Alignment.center,
),
);
}
}
class TestButton extends StatefulWidget {
@required
final String title;
TestButton(this.title);
@override
_TestButtonState createState() => _TestButtonState();
}
class _TestButtonState extends State<TestButton> {
bool isHighlighted = false;
@override
void initState() {
super.initState();
}
@override
Widget build(BuildContext context) {
return Container(
height: 50,
decoration: BoxDecoration(boxShadow: [
BoxShadow(
color: Colors.black.withOpacity(isHighlighted ? 0.5 : 0.0),
spreadRadius: isHighlighted ? 5 : 0,
)
]),
child: FlatButton(
shape: ContinuousRectangleBorder(borderRadius: BorderRadius.zero),
splashColor: Colors.black12,
color: Colors.white,
hoverColor: Colors.black12,
highlightColor: Colors.black12,
mouseCursor: MouseCursor.uncontrolled,
child: Text(widget.title),
onPressed: () => null,
onHighlightChanged: (value) {
setState(() {
isHighlighted = value;
});
},
));
}
@override
void dispose() {
super.dispose();
}
}
导入“包装:颤振/材料.省道”;
导入“package:flatter/rendering.dart”;
void main(){
runApp(新的MyApp());
}
类MyApp扩展了无状态小部件{
@凌驾
小部件构建(构建上下文){
返回新材料PP(
标题:“生成的应用程序”,
主题:新主题数据(
主样本:颜色。蓝色,
原色:常量颜色(0xFF2196f3),
accentColor:const Color(0xFF2196f3),
画布颜色:常量颜色(0xFFFAFA),
),
主页:新建MyHomePage(),
);
}
}
类MyHomePage扩展StatefulWidget{
MyHomePage({Key}):超级(Key:Key);
@凌驾
_MyHomePageState createState()=>new_MyHomePageState();
}
类_MyHomePageState扩展状态{
@凌驾
小部件构建(构建上下文){
归还新脚手架(
appBar:新的appBar(
标题:新文本(“应用程序名称”),
),
主体:新容器(
孩子:填充(
填充:边缘组。对称(水平:10),
儿童:中心(
孩子:新的一排(
儿童:[
扩大(
子:容器(
颜色:颜色,白色,
孩子:填充(
padding:const EdgeInsets.fromLTRB(0,0,5,0),
子:容器(
装饰:BoxEdition(boxShadow:[
箱形阴影(
颜色:颜色。透明,
半径:5.0,
),
]),
子项:TestButton(“Button1”),
),
)),
扩大(
子:容器(
颜色:颜色,白色,
孩子:填充(
padding:const EdgeInsets.fromLTRB(0,0,5,0),
子:容器(
装饰:BoxEdition(boxShadow:[
箱形阴影(
颜色:颜色。透明,
半径:5.0,
),
]),
子项:TestButton(“Button2”),
),
))
],
mainAxisAlignment:mainAxisAlignment.start,
mainAxisSize:mainAxisSize.max,
crossAxisAlignment:crossAxisAlignment.center,
))),
填充:常量边集全部(0.0),
对齐:对齐.center,
),
);
}
}
类TestButton扩展StatefulWidget{
@必需的
最后的字符串标题;
TestButton(this.title);
@凌驾
_TestButtonState createState()=>\u TestButtonState();
}
类_TestButtonState扩展状态{
bool isHighlighted=错误;
@凌驾
void initState(){
super.initState();
}
@凌驾
小部件构建(构建上下文){
返回容器(
身高:50,
装饰:BoxEdition(boxShadow:[
箱形阴影(
颜色:颜色。黑色。不透明度(isHighlighted?0.5:0.0),
扩展半径:isHighlighted?5:0,
)
]),
孩子:扁平按钮(
形状:连续矩形边框(边框半径:borderRadius.zero),
颜色:颜色。黑色12,
颜色:颜色,白色,
hoverColor:Colors.black12,
highlightColor:Colors.black12,
mouseCursor:mouseCursor.uncontrolled,
子:文本(widget.title),
onPressed:()=>null,
onHighlightChanged:(值){
设置状态(){
isHighlighted=值;
});
},
));
}
@凌驾
无效处置(){
super.dispose();
}
}
您好,您可以检查编辑的代码
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
void main() {
runApp(new MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'Generated App',
theme: new ThemeData(
primarySwatch: Colors.blue,
primaryColor: const Color(0xFF2196f3),
accentColor: const Color(0xFF2196f3),
canvasColor: const Color(0xFFfafafa),
),
home: new MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key}) : super(key: key);
@override
_MyHomePageState createState() => new _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('App Name'),
),
body: new Container(
child: Padding(
padding: EdgeInsets.symmetric(horizontal: 10),
child: Center(
child: new Row(
children: [
Expanded(
child: Container(
color: Colors.white,
child: Padding(
padding: const EdgeInsets.fromLTRB(0, 0, 5, 0),
child: Container(
decoration: BoxDecoration(boxShadow: [
BoxShadow(
color: Colors.transparent,
blurRadius: 5.0,
),
]),
child: TestButton("Button1")),
),
)),
Expanded(
child: Container(
color: Colors.white,
child: Padding(
padding: const EdgeInsets.fromLTRB(0, 0, 5, 0),
child: Container(
decoration: BoxDecoration(boxShadow: [
BoxShadow(
color: Colors.transparent,
blurRadius: 5.0,
),
]),
child: TestButton("Button2")),
),
))
],
mainAxisAlignment: MainAxisAlignment.start,
mainAxisSize: MainAxisSize.max,
crossAxisAlignment: CrossAxisAlignment.center,
))),
padding: const EdgeInsets.all(0.0),
alignment: Alignment.center,
),
);
}
}
class TestButton extends StatefulWidget {
@required
final String title;
TestButton(this.title);
@override
_TestButtonState createState() => _TestButtonState();
}
class _TestButtonState extends State<TestButton> {
bool isHighlighted = false;
@override
void initState() {
super.initState();
}
@override
Widget build(BuildContext context) {
return Container(
height: 50,
decoration: BoxDecoration(boxShadow: [
BoxShadow(
color: Colors.black.withOpacity(isHighlighted ? 0.5 : 0.0),
spreadRadius: isHighlighted ? 5 : 0,
)
]),
child: FlatButton(
shape: ContinuousRectangleBorder(borderRadius: BorderRadius.zero),
splashColor: Colors.black12,
color: Colors.white,
hoverColor: Colors.black12,
highlightColor: Colors.black12,
mouseCursor: MouseCursor.uncontrolled,
child: Text(widget.title),
onPressed: () => null,
onHighlightChanged: (value) {
setState(() {
isHighlighted = value;
});
},
));
}
@override
void dispose() {
super.dispose();
}
}
导入“包装:颤振/材料.省道”;
导入“package:flatter/rendering.dart”;
void main(){
runApp(新的MyApp());
}
类MyApp扩展了无状态小部件{
@凌驾
小部件构建(构建上下文){
返回新材料PP(
标题:“生成的应用程序”,
主题:新主题数据(
主样本:颜色。蓝色,
原色:常量颜色(0xFF2196f3),
accentColor:const Color(0xFF2196f3),
画布颜色:常量颜色(0xFFFAFA),
),
主页:新建MyHomePage(),
);
}
}
类MyHomePage扩展StatefulWidget{
MyHomePage({Key}):超级(Key:Key);
@凌驾
_MyHomePageState createState()=>new_MyHomePageState();
}
类_MyHomePageState扩展状态{
@凌驾
小部件构建(构建上下文){
归还新脚手架(
appBar:新的appBar(
标题:新文本(“应用程序名称”),
),
主体:新容器(
孩子:填充(
填充:边集。对称(水平)