Flutter 如何在颤振中更改PopupMenuItem的背景色
如何在颤振中更改PopupMenuItem的背景色 现在我只需更改PopupMenuItem子项的颜色,结果如下: 代码如下:Flutter 如何在颤振中更改PopupMenuItem的背景色,flutter,flutter-layout,Flutter,Flutter Layout,如何在颤振中更改PopupMenuItem的背景色 现在我只需更改PopupMenuItem子项的颜色,结果如下: 代码如下: PopupMenuButton<int>( onSelected: (value) { // TODO: Implement onSelect }, offset: Offset(50, 50), itemBuilder: (context) => [
PopupMenuButton<int>(
onSelected: (value) {
// TODO: Implement onSelect
},
offset: Offset(50, 50),
itemBuilder: (context) => [
PopupMenuItem(
value: 1,
child: Container(
height: double.infinity,
width: double.infinity,
color: Colors.greenAccent, // i use this to change the bgColor color right now
child: Row(
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
Icon(Icons.check),
SizedBox(width: 10.0),
Text("Konfirmasi Update"),
SizedBox(width: 10.0),
],
),
),
),
弹出菜单按钮(
onSelected:(值){
//TODO:实现onSelect
},
偏移量:偏移量(50,50),
itemBuilder:(上下文)=>[
PopupMenuItem(
价值:1,
子:容器(
高度:双无限,
宽度:double.infinity,
color:Colors.greenAccent,//我现在用它来更改bgColor颜色
孩子:排(
mainAxisAlignment:mainAxisAlignment.end,
儿童:[
图标(图标。检查),
尺寸箱(宽度:10.0),
文本(“Konfirmasi更新”),
尺寸箱(宽度:10.0),
],
),
),
),
我想要的是改变“Konfirmasi更新”选项的背景色,正如您在上面的图片上看到的,颜色在选项外留下白色区域
如何完全更改PopupMenuItem背景色,而不保留PopupMenuItem外部的白色区域?您可以将PopupMenuItem按钮放在主题内,在主题中,您必须更新cardColor以获得所需的背景色,如下所示:
Center(
child: Theme(
data: Theme.of(context).copyWith(
cardColor: Colors.greenAccent,
),
child: PopupMenuButton<int>(
onSelected: (value) {
},
offset: Offset(50, 50),
itemBuilder: (context) => [
PopupMenuItem(
value: 1,
child: Container(
height: double.infinity,
width: double.infinity,
color: Colors.greenAccent, // i use this to change the bgColor color right now
child: Row(
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
Icon(Icons.check),
SizedBox(width: 10.0),
Text("Konfirmasi Update"),
SizedBox(width: 10.0),
],
),
),
)
]
)
)
)
中心(
儿童:主题(
数据:Theme.of(context).copyWith(
cardColor:Colors.greenAccent,
),
孩子:弹出菜单按钮(
onSelected:(值){
},
偏移量:偏移量(50,50),
itemBuilder:(上下文)=>[
PopupMenuItem(
价值:1,
子:容器(
高度:双无限,
宽度:double.infinity,
color:Colors.greenAccent,//我现在用它来更改bgColor颜色
孩子:排(
mainAxisAlignment:mainAxisAlignment.end,
儿童:[
图标(图标。检查),
尺寸箱(宽度:10.0),
文本(“Konfirmasi更新”),
尺寸箱(宽度:10.0),
],
),
),
)
]
)
)
)
无法直接使用PopupMenuButton
和PopupMenuItem
小部件,因为如果您检查源代码,则存在用于垂直和水平填充的硬代码值
我修改了弹出菜单.dart
文件的代码,特别是这些值:
const double _kMenuVerticalPadding = 0.0;//8.0;
const double _kMenuHorizontalPadding = 0.0;//16.0;
如果要使其正常工作,请将此文件下载到项目中:
在项目中导入该文件并添加别名:
import 'your_project/my_popup_menu.dart' as mypopup;
用法:
@override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: mypopup.PopupMenuButton<int>(
elevation: 20,
onSelected: (value) {
// TODO: Implement onSelect
},
offset: Offset(50, 50),
itemBuilder: (context) => [
mypopup.PopupMenuItem(
value: 1,
child: Container(
height: double.infinity,
width: double.infinity,
color: Colors
.greenAccent, // i use this to change the bgColor color right now
child: Row(
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
Icon(Icons.check),
SizedBox(width: 10.0),
Text("Konfirmasi Update"),
SizedBox(width: 10.0),
],
),
),
),
mypopup.PopupMenuItem(
value: 1,
child: Container(
height: double.infinity,
width: double.infinity,
child: Row(
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
Icon(Icons.check),
SizedBox(width: 10.0),
Text("Revisi Update"),
SizedBox(width: 10.0),
],
),
),
),
],
),
),
);
}
@覆盖
小部件构建(构建上下文){
返回脚手架(
正文:中(
子项:mypopup.PopupMenuButton(
海拔:20,
onSelected:(值){
//TODO:实现onSelect
},
偏移量:偏移量(50,50),
itemBuilder:(上下文)=>[
mypopup.PopupMenuItem(
价值:1,
子:容器(
高度:双无限,
宽度:double.infinity,
颜色:颜色
.greenAccent,//我现在用它来更改bgColor颜色
孩子:排(
mainAxisAlignment:mainAxisAlignment.end,
儿童:[
图标(图标。检查),
尺寸箱(宽度:10.0),
文本(“Konfirmasi更新”),
尺寸箱(宽度:10.0),
],
),
),
),
mypopup.PopupMenuItem(
价值:1,
子:容器(
高度:双无限,
宽度:double.infinity,
孩子:排(
mainAxisAlignment:mainAxisAlignment.end,
儿童:[
图标(图标。检查),
尺寸箱(宽度:10.0),
文本(“修订更新”),
尺寸箱(宽度:10.0),
],
),
),
),
],
),
),
);
}
结果
另一种选择是继承PopupMenuItem 若要仅使用,请更改CustomPopupMenuItem的PopupMenuButton并设置颜色
import 'package:flutter/material.dart';
class CustomPopupMenuItem<T> extends PopupMenuItem<T> {
final Color color;
const CustomPopupMenuItem({
Key key,
T value,
bool enabled = true,
Widget child,
this.color,
}) : super(key: key, value: value, enabled: enabled, child: child);
@override
_CustomPopupMenuItemState<T> createState() => _CustomPopupMenuItemState<T>();
}
class _CustomPopupMenuItemState<T> extends PopupMenuItemState<T, CustomPopupMenuItem<T>> {
@override
Widget build(BuildContext context) {
return Container(
child: super.build(context),
color: widget.color,
);
}
}
导入“包装:颤振/材料.省道”;
类CustomPopupMenuItem扩展了PopupMenuItem{
最终颜色;
const CustomPopupMenuItem({
关键点,
T值,
bool enabled=true,
孩子,
这个颜色,
}):super(键:键,值:值,启用:启用,子项:子项);
@凌驾
_CustomPopupMenuItemState createState()=>\u CustomPopupMenuItemState();
}
类_CustomPopupMenuItemState扩展了PopupMenuItemState{
@凌驾
小部件构建(构建上下文){
返回容器(
子:super.build(上下文),
颜色:widget.color,
);
}
}
更改整个菜单或其子菜单的颜色非常容易
使用正则颜色表达式。
颜色:颜色。红色或任何你喜欢的颜色
您可以在
PopupMenuButton()
或PopupMenuItem()
中使用它,它将更改整个弹出窗口的背景色,我想要的是更改特定弹出窗口项的背景色。在我的情况下,我只想更改“Konfirmasi更新”的背景色目前,greenSo的选项是框架的一个限制?颤振中有这么多小部件,所以哟