Flutter下拉菜单插件jd_dropdown_menu_widget的使用
Flutter下拉菜单插件jd_dropdown_menu_widget的使用
一个简单的下拉菜单,支持任意widget。
将JDDropdownMenuWidget放置到任意位置即可。
开始使用
1. 在pubspec.yaml
文件中添加依赖
jd_dropdowm_menu_widget: any
2. 安装依赖
在终端运行以下命令:
flutter pub get
3. 导入包
在需要使用该插件的文件中导入:
import 'package:jd_dropdowm_menu_widget/jd_dropdowm_menu_widget.dart';
4. 使用插件
在需要显示下拉菜单的地方使用JDDropdownMenuWidget
,并设置相应的参数。例如:
class MyApp extends StatelessWidget {
[@override](/user/override)
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
[@override](/user/override)
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
String title1 = '城市';
String title2 = '品牌';
GlobalKey _key1 = GlobalKey();
JDDropdownMenuController controller = JDDropdownMenuController();
[@override](/user/override)
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
actions: [
TextButton(
key: _key1,
onPressed: () {
RenderBox renderBox = _key1.currentContext.findRenderObject();
Rect position = renderBox.localToGlobal(Offset.zero) & renderBox.size;
showDropdownMenu(
position: position,
context: context,
pageBuilder: (c1) => Container(
color: Colors.orange,
),
);
},
child: Text(
'下拉菜单',
style: TextStyle(
color: Colors.white,
),
))
],
),
body: Column(
children: [
Container(
margin: EdgeInsets.only(
top: 10,
),
child: JDDropdownMenuWidget(
controller: controller,
itemStyle: JDDropdownMenuWidgetStyle.style2,
click: (int index) {
print('$index');
},
items: [
JDDropdownMenuItem(
maxHeight: 300,
title: Container(
alignment: Alignment.topCenter,
margin: EdgeInsets.only(
left: 10,
right: 10,
),
child: Text(title1),
),
menu: CityWidget(
click: (String selectedValue) {
setState(() {
title1 = selectedValue;
controller.hide();
});
print('选择的城市为:$selectedValue');
},
),
),
JDDropdownMenuItem(
maxHeight: 300,
title: Container(
alignment: Alignment.topCenter,
margin: EdgeInsets.only(
left: 10,
right: 10,
),
child: Text(title2),
),
menu: MenuListWidget(
selectedValue: title2,
click: (String value) {
setState(() {
title2 = value;
controller.hide();
});
},
),
),
JDDropdownMenuItem(
title: Container(
alignment: Alignment.topCenter,
margin: EdgeInsets.only(
left: 10,
right: 10,
),
child: Text('菜单3'),
),
menu: Container(
color: Colors.blue,
),
),
],
),
),
Container(
child: Builder(
builder: (c) {
return TextButton(
onPressed: () {
RenderBox renderBox = c.findRenderObject();
Rect position = renderBox.localToGlobal(Offset.zero) & renderBox.size;
showDropdownMenu(
position: position,
context: c,
pageBuilder: (c1) => Container(
color: Color(0xffff0000),
),
);
},
child: Text('Menu1'));
},
),
),
Container(
child: Builder(
builder: (c) {
return TextButton(
onPressed: () {
showPop(
backgroundColor: Colors.red,
barrierColor: const Color(0x00000000),
context: c,
items: [
Text(
'个人信息',
style: TextStyle(color: Colors.white, fontSize: 14),
),
Text(
'退出',
style: TextStyle(color: Colors.white, fontSize: 14),
),
],
);
},
child: Text('Menu2'));
},
),
),
],
),
);
}
}
更多关于Flutter下拉菜单插件jd_dropdown_menu_widget的使用的实战教程也可以访问 https://www.itying.com/category-92-b0.html
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