[英]How to create a vertical scrolling menu effect in Flutter
您可以通过简单地使用StatefulWidget
并使用布尔值管理隐藏/显示功能来实现这一点。
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'),
),
],
);
}
}
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