Flutter 有没有一种方法可以在Flitter中制作漂亮的下拉菜单?
我想制作这样漂亮的下拉菜单。我已经试过用容器做了,但是花了很长时间。是否有配置默认下拉菜单和项目的软件包或方法Flutter 有没有一种方法可以在Flitter中制作漂亮的下拉菜单?,flutter,drop-down-menu,Flutter,Drop Down Menu,我想制作这样漂亮的下拉菜单。我已经试过用容器做了,但是花了很长时间。是否有配置默认下拉菜单和项目的软件包或方法 尝试下面这样的代码 new DropdownButton<String>( items: <String>['A', 'B', 'C', 'D'].map((String value) { return new DropdownMenuItem<String>( value: value, child: new T
尝试下面这样的代码
new DropdownButton<String>(
items: <String>['A', 'B', 'C', 'D'].map((String value) {
return new DropdownMenuItem<String>(
value: value,
child: new Text(value),
);
}).toList(),
onChanged: (_) {},
)
新建下拉按钮(
项目:['A','B','C','D'].map((字符串值){
返回新的DropdownMenuItem(
价值:价值,
子项:新文本(值),
);
}).toList(),
一旦改变:({},
)
另一个例子
另一个例子2
尝试下面这样的代码
new DropdownButton<String>(
items: <String>['A', 'B', 'C', 'D'].map((String value) {
return new DropdownMenuItem<String>(
value: value,
child: new Text(value),
);
}).toList(),
onChanged: (_) {},
)
新建下拉按钮(
项目:['A','B','C','D'].map((字符串值){
返回新的DropdownMenuItem(
价值:价值,
子项:新文本(值),
);
}).toList(),
一旦改变:({},
)
另一个例子
另一个例子2
您可以将Container()小部件与Boxdecoration一起使用,并作为子部件使用DropdownButton()小部件
使用DropdownButtonHideUnderline()作为父项隐藏默认下划线
示例代码:
Container(
padding: const EdgeInsets.symmetric(horizontal: 12.0),
height: 40.0,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(30.0),
color: Colors.yellow,
),
child: DropdownButtonHideUnderline(
child: DropdownButton() // your Dropdown Widget here
),
);
您可以将Container()小部件与Boxdecoration一起使用,并作为子部件使用DropdownButton()小部件
使用DropdownButtonHideUnderline()作为父项隐藏默认下划线
示例代码:
Container(
padding: const EdgeInsets.symmetric(horizontal: 12.0),
height: 40.0,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(30.0),
color: Colors.yellow,
),
child: DropdownButtonHideUnderline(
child: DropdownButton() // your Dropdown Widget here
),
);
试试这个:
import 'package:flutter/material.dart';
void main() => runApp(ExampleApp());
class ExampleApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: PopMenu(),
);
}
}
class PopMenu extends StatefulWidget {
@override
_PopMenuState createState() => _PopMenuState();
}
class _PopMenuState extends State<PopMenu> {
List<String> _menuList = ['menu 1', 'menu 2', 'menu 3'];
GlobalKey _key = LabeledGlobalKey("button_icon");
OverlayEntry _overlayEntry;
Offset _buttonPosition;
bool _isMenuOpen = false;
void _findButton() {
RenderBox renderBox = _key.currentContext.findRenderObject();
_buttonPosition = renderBox.localToGlobal(Offset.zero);
}
void _openMenu() {
_findButton();
_overlayEntry = _overlayEntryBuilder();
Overlay.of(context).insert(_overlayEntry);
_isMenuOpen = !_isMenuOpen;
}
void _closeMenu() {
_overlayEntry.remove();
_isMenuOpen = !_isMenuOpen;
}
OverlayEntry _overlayEntryBuilder() {
return OverlayEntry(
builder: (context) {
return Positioned(
top: _buttonPosition.dy + 70,
left: _buttonPosition.dx,
width: 300,
child: _popMenu(),
);
},
);
}
Widget _popMenu() {
return Material(
child: Container(
width: 300,
height: 300,
decoration: BoxDecoration(
color: Color(0xFFF67C0B9),
borderRadius: BorderRadius.circular(4),
),
child: Column(
mainAxisSize: MainAxisSize.min,
children: List.generate(
_menuList.length,
(index) {
return GestureDetector(
onTap: () {},
child: Container(
alignment: Alignment.center,
width: 300,
height: 100,
child: Text(_menuList[index]),
),
);
},
),
),
),
);
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: Container(
key: _key,
width: 300,
height: 50,
decoration: BoxDecoration(
color: Color(0xFFF5C6373),
borderRadius: BorderRadius.circular(25),
),
child: Row(
children: [
Expanded(
child: Center(child: Text('menu 1')),
),
IconButton(
icon: Icon(Icons.arrow_downward),
color: Colors.white,
onPressed: () {
_isMenuOpen ? _closeMenu() : _openMenu();
},
),
],
),
),
),
);
}
}
导入“包装:颤振/材料.省道”;
void main()=>runApp(ExampleApp());
类ExampleApp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(
debugShowCheckedModeBanner:false,
主页:PopMenu(),
);
}
}
类PopMenu扩展StatefulWidget{
@凌驾
_PopMenuState createState()=>\u PopMenuState();
}
类_popmenstate扩展状态{
列表_menuList=[‘菜单1’、‘菜单2’、‘菜单3’];
GlobalKey _key=LabeledGlobalKey(“按钮图标”);
过度进入(OverlayEntry);;
偏移按钮位置;
bool _isMenuOpen=false;
void _findButton(){
RenderBox RenderBox=_key.currentContext.FindEnderObject();
_buttonPosition=renderBox.localToGlobal(偏移量为0);
}
void _openMenu(){
_findButton();
_overlayEntry=_overlayEntryBuilder();
覆盖.of(上下文).insert(_overlayEntry);
_isMenuOpen=!\u isMenuOpen;
}
void _closeMenu(){
_覆盖入口。移除();
_isMenuOpen=!\u isMenuOpen;
}
OverlayEntry\u overlayEntryBuilder(){
返回重叠入口(
生成器:(上下文){
返回定位(
顶部:_buttonPosition.dy+70,
左:_buttonPosition.dx,
宽度:300,
子项:_popMenu(),
);
},
);
}
小部件popMenu(){
退货(
子:容器(
宽度:300,
身高:300,
装饰:盒子装饰(
颜色:颜色(0xFFF67C0B9),
边界半径:边界半径。圆形(4),
),
子:列(
mainAxisSize:mainAxisSize.min,
子项:List.generate(
_menuList.length,
(索引){
返回手势检测器(
onTap:(){},
子:容器(
对齐:对齐.center,
宽度:300,
身高:100,
子项:文本(_menuList[index]),
),
);
},
),
),
),
);
}
@凌驾
小部件构建(构建上下文){
返回脚手架(
正文:中(
子:容器(
键:_键,
宽度:300,
身高:50,
装饰:盒子装饰(
颜色:颜色(0xFFF5C6373),
边界半径:边界半径。圆形(25),
),
孩子:排(
儿童:[
扩大(
子:居中(子:文本(“菜单1”),
),
图标按钮(
图标:图标(图标。向下箭头),
颜色:颜色,白色,
已按下:(){
_isMenuOpen?_closeMenu():_openMenu();
},
),
],
),
),
),
);
}
}
试试这个:
import 'package:flutter/material.dart';
void main() => runApp(ExampleApp());
class ExampleApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: PopMenu(),
);
}
}
class PopMenu extends StatefulWidget {
@override
_PopMenuState createState() => _PopMenuState();
}
class _PopMenuState extends State<PopMenu> {
List<String> _menuList = ['menu 1', 'menu 2', 'menu 3'];
GlobalKey _key = LabeledGlobalKey("button_icon");
OverlayEntry _overlayEntry;
Offset _buttonPosition;
bool _isMenuOpen = false;
void _findButton() {
RenderBox renderBox = _key.currentContext.findRenderObject();
_buttonPosition = renderBox.localToGlobal(Offset.zero);
}
void _openMenu() {
_findButton();
_overlayEntry = _overlayEntryBuilder();
Overlay.of(context).insert(_overlayEntry);
_isMenuOpen = !_isMenuOpen;
}
void _closeMenu() {
_overlayEntry.remove();
_isMenuOpen = !_isMenuOpen;
}
OverlayEntry _overlayEntryBuilder() {
return OverlayEntry(
builder: (context) {
return Positioned(
top: _buttonPosition.dy + 70,
left: _buttonPosition.dx,
width: 300,
child: _popMenu(),
);
},
);
}
Widget _popMenu() {
return Material(
child: Container(
width: 300,
height: 300,
decoration: BoxDecoration(
color: Color(0xFFF67C0B9),
borderRadius: BorderRadius.circular(4),
),
child: Column(
mainAxisSize: MainAxisSize.min,
children: List.generate(
_menuList.length,
(index) {
return GestureDetector(
onTap: () {},
child: Container(
alignment: Alignment.center,
width: 300,
height: 100,
child: Text(_menuList[index]),
),
);
},
),
),
),
);
}
@override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: Container(
key: _key,
width: 300,
height: 50,
decoration: BoxDecoration(
color: Color(0xFFF5C6373),
borderRadius: BorderRadius.circular(25),
),
child: Row(
children: [
Expanded(
child: Center(child: Text('menu 1')),
),
IconButton(
icon: Icon(Icons.arrow_downward),
color: Colors.white,
onPressed: () {
_isMenuOpen ? _closeMenu() : _openMenu();
},
),
],
),
),
),
);
}
}
导入“包装:颤振/材料.省道”;
void main()=>runApp(ExampleApp());
类ExampleApp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(
debugShowCheckedModeBanner:false,
主页:PopMenu(),
);
}
}
类PopMenu扩展StatefulWidget{
@凌驾
_PopMenuState createState()=>\u PopMenuState();
}
类_popmenstate扩展状态{
列表_menuList=[‘菜单1’、‘菜单2’、‘菜单3’];
GlobalKey _key=LabeledGlobalKey(“按钮图标”);
过度进入(OverlayEntry);;
偏移按钮位置;
bool _isMenuOpen=false;
void _findButton(){
RenderBox RenderBox=_key.currentContext.FindEnderObject();
_buttonPosition=renderBox.localToGlobal(偏移量为0);
}
void _openMenu(){
_findButton();
_overlayEntry=_overlayEntryBuilder();
覆盖.of(上下文).insert(_overlayEntry);
_isMenuOpen=!\u isMenuOpen;
}
void _closeMenu(){
_覆盖入口。移除();
_isMenuOpen=!\u isMenuOpen;
}
OverlayEntry\u overlayEntryBuilder(){
返回重叠入口(
生成器:(上下文){
返回定位(
顶部:_buttonPosition.dy+70,
左:_buttonPosition.dx,
宽度:300,
子项:_popMenu(),
);
},
);
}
小部件popMenu(){
退货(
子:容器(
宽度:300,
身高:300,
装饰:盒子装饰(
颜色:颜色(0xFFF67C0B9),
边界半径:边界半径。圆形(4),
),
子:列(
mainAxisSize:mainAxisSize.min,
子项:List.generate(
_menuList.length,
(索引){
返回手势检测器(
onTap:(){},
子:容器(
对齐:对齐.center,
宽度:300,