如何在 Flutter 中创建垂直滚动菜单效果
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【中文标题】如何在 Flutter 中创建垂直滚动菜单效果【英文标题】:How to create a vertical scrolling menu effect in Flutter 【发布时间】:2021-02-22 16:01:21 【问题描述】:这个问题是对this 问题的改进。在这种情况下,我想重现您可以在我们基础的this 左侧看到的垂直菜单。如果您单击与左侧示例相关的链接,您会看到一些菜单。例如,单击Base
,您将看到一个垂直菜单出现和消失。我也想知道如何重现它。一个示例代码将不胜感激。
谢谢大家
【问题讨论】:
这能回答你的问题吗? How to create an admin UI left menu with Flutter 【参考方案1】:您只需使用StatefulWidget
并使用布尔值管理隐藏/显示功能即可实现此目的。
这是更新后的代码:
import 'package:flutter/material.dart';
final Color darkBlue = Color.fromARGB(255, 18, 32, 47);
void main()
runApp(MyApp());
class MyApp extends StatelessWidget
@override
Widget build(BuildContext context)
return MaterialApp(
theme: ThemeData.dark().copyWith(scaffoldBackgroundColor: darkBlue),
debugShowCheckedModeBanner: false,
home: Scaffold(
body: Center(
child: MyWidget(),
),
),
);
class MyWidget extends StatefulWidget
@override
_MyWidgetState createState() => _MyWidgetState();
class _MyWidgetState extends State<MyWidget>
with SingleTickerProviderStateMixin
final colors = <Color>[Colors.indigo, Colors.blue, Colors.orange, Colors.red];
double _size = 250.0;
bool _large = true;
void _updateSize()
setState(()
_size = _large ? 250.0 : 0.0;
_large = !_large;
);
@override
Widget build(BuildContext context)
return Scaffold(
body: Row(
children: [
AnimatedSize(
curve: Curves.easeIn,
vsync: this,
duration: Duration(seconds: 1),
child: LeftDrawer(size: _size)),
Expanded(
flex: 4,
child: Container(
child: Column(
children: [
Container(
color: Colors.white,
padding: const EdgeInsets.all(8),
child: Row(
children: [
IconButton(
icon: Icon(Icons.menu, color: Colors.black87),
onPressed: ()
_updateSize();
,
),
FlatButton(
child: Text(
'Dashboard',
style: const TextStyle(color: Colors.black87),
),
onPressed: () ,
),
FlatButton(
child: Text(
'User',
style: const TextStyle(color: Colors.black87),
),
onPressed: () ,
),
FlatButton(
child: Text(
'Settings',
style: const TextStyle(color: Colors.black87),
),
onPressed: () ,
),
const Spacer(),
IconButton(
icon: Icon(Icons.brightness_3, color: Colors.black87),
onPressed: () ,
),
IconButton(
icon: Icon(Icons.notification_important,
color: Colors.black87),
onPressed: () ,
),
CircleAvatar(),
],
),
),
Container(
height: 1,
color: Colors.black12,
),
Card(
margin: EdgeInsets.zero,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(0),
),
child: Container(
color: Colors.white,
padding: const EdgeInsets.all(20),
child: Row(
children: [
Text(
'Home / Admin / Dashboard',
style: const TextStyle(color: Colors.black),
),
],
),
),
),
Expanded(
child: ListView(
children: [
Row(
children: [
_container(0),
_container(1),
_container(2),
_container(3),
],
),
Container(
height: 400,
color: Color(0xFFE7E7E7),
padding: const EdgeInsets.all(16),
child: Card(
color: Colors.white,
child: Container(
padding: const EdgeInsets.all(16),
child: Text(
'Traffic',
style: const TextStyle(color: Colors.black87),
),
),
),
),
],
),
),
],
),
),
),
],
),
);
Widget _container(int index)
return Expanded(
child: Container(
padding: const EdgeInsets.all(20),
color: Color(0xFFE7E7E7),
child: Card(
color: Color(0xFFE7E7E7),
child: Container(
color: colors[index],
width: 250,
height: 140,
padding: const EdgeInsets.all(20),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Row(
children: [
Expanded(
child: Text(
'9.823',
style: TextStyle(fontSize: 24),
)),
Icon(Icons.more_vert),
],
),
Text('Members online')
],
),
),
),
),
);
class LeftDrawer extends StatefulWidget
LeftDrawer(
Key key,
this.size,
) : super(key: key);
final double size;
@override
_LeftDrawerState createState() => _LeftDrawerState();
class _LeftDrawerState extends State<LeftDrawer>
bool dropdownVisible = false;
@override
Widget build(BuildContext context)
return Expanded(
flex: 1,
child: Container(
width: widget.size,
color: const Color(0xFF2C3C56),
child: ListView(
children: [
Container(
alignment: Alignment.center,
padding: const EdgeInsets.all(16),
color: Color(0xFF223047),
child: Text('CORE UI'),
),
_tile('Dashboard'),
Container(
padding: const EdgeInsets.only(left: 10),
margin: const EdgeInsets.only(top: 30),
child: Text('THEME',
style: TextStyle(
color: Colors.white54,
))),
_tile('Colors'),
_tile('Typography'),
_tileDropdown('Base'),
_tile('Buttons'),
],
),
),
);
Widget _tile(String label)
return ListTile(
title: Text(label),
onTap: () ,
);
Widget _option(String label)
return ListTile(
tileColor: Color(0xFF223047),
contentPadding: const EdgeInsets.only(left: 40),
title: Text(label),
onTap: () ,
);
Widget _tileDropdown(String label)
return Column(
mainAxisSize: MainAxisSize.min,
children: [
ListTile(
title: Text(label),
onTap: ()
setState(()
dropdownVisible = !dropdownVisible;
);
,
trailing: dropdownVisible
? Icon(Icons.arrow_drop_up)
: Icon(Icons.chevron_left),
),
Visibility(
visible: dropdownVisible,
child: _option('Breadcrumbs'),
),
Visibility(
visible: dropdownVisible,
child: _option('Cloud'),
),
Visibility(
visible: dropdownVisible,
child: _option('Carousel'),
),
Visibility(
visible: dropdownVisible,
child: _option('Collapse'),
),
],
);
【讨论】:
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