flutter - Drawer Widget - 更改 Scaffold 正文内容
问题描述
使用 Flutter Scaffold.Drawer 时 - 是否可以让 Drawer 中的链接更改页面上的内容(Scaffold.body)?
我尝试使用有状态的状态进行操作,但无法完成。这是我的
主要.dart
import 'package:flutter/material.dart';
import 'Navbars/navbar.dart';
import 'Pages/settings.dart';
void main() => runApp(MaterialApp(home: Home()));
class Home extends StatelessWidget {
const Home({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
Widget widget_for_body = settingsPage();
return Scaffold(
appBar: AppBar(
title: Text("MyApp"),
centerTitle: true,
backgroundColor: Colors.redAccent,
),
body: widget_for_body,
floatingActionButton: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
FloatingActionButton(
onPressed: () {},
child: Text("Stage"),
backgroundColor: Colors.green,
),
FloatingActionButton(
onPressed: () {},
child: Text("Dev"),
backgroundColor: Colors.green,
),
],
),
drawer: NavBar(),
);
}
}
导航栏.dart
import 'package:flutter/material.dart';
class NavBar extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Drawer(
child: ListView(
padding: EdgeInsets.zero,
children: [
UserAccountsDrawerHeader(
accountName: Text("User"),
accountEmail: Text("User Test"),
currentAccountPicture: CircleAvatar(
child: ClipOval(
child: Image.network(
'https://oflutter.com/wp-content/uploads/2021/02/girl-profile.png',
fit: BoxFit.cover,
width: 90,
height: 90,
),
),
),
decoration: BoxDecoration(
color: Colors.blue,
image: DecorationImage(
fit: BoxFit.fill,
image: NetworkImage(
'https://oflutter.com/wp-content/uploads/2021/02/profile-bg3.jpg')),
),
),
ListTile(
leading: Icon(Icons.notifications),
title: Text('Alerts'),
onTap: () => {},
trailing: ClipOval(
child: Container(
color: Colors.red,
width: 40,
height: 40,
child: Center(
child: Text(
'Soon',
style: TextStyle(
color: Colors.white,
fontSize: 12,
),
),
),
),
),
),
ListTile(
leading: Icon(Icons.settings),
title: Text('Settings'),
// to close the navbar
onTap: () => {Navigator.of(context).pop()},
),
Divider(),
ListTile(
title: Text('Exit'),
leading: Icon(Icons.exit_to_app),
onTap: () => null,
),
],
),
);
}
}
* stage.dart
import 'package:flutter/material.dart';
class stagePage extends StatelessWidget {
const stagePage({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Container(
child: Text("test2"),
);
}
}
当按下抽屉上的设置按钮时,我正在尝试使用 stage.dart 更改 main.dart 中的主体。可能吗 ?
解决方案
你可以通过做这样的事情来做到这一点
首先创建一个小部件列表,其中包含您想要显示body
为Scaffold
. 现在您还需要一个int
作为索引来在正文中显示小部件。然后,当您点击时,ListTile
只需更新方法内的索引setState({})
。
正文 1:
import 'package:flutter/material.dart';
class LandingPage extends StatelessWidget {
LandingPage({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Container(
child: Text('bruh'),
);
}
}
身体 2:
导入“包:颤振/material.dart”;
class SettingsPage extends StatelessWidget {
SettingsPage({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Container(
child: Text('settings'),
);
}
}
主页:
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key, required this.title}) : super(key: key);
final String title;
@override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
List<Widget> bodyWidgets = [LandingPage(), SettingsPage()];
int index = 0;
@override
Widget build(BuildContext context) {
return Scaffold(
drawer: Drawer(
child: ListView(
padding: EdgeInsets.zero,
children: [
const DrawerHeader(
decoration: BoxDecoration(
color: Colors.blue,
),
child: Text('Drawer Header'),
),
ListTile(
title: const Text('Item 0'),
onTap: () {
setState(() {
index = 0;
Navigator.pop(context);
});
},
),
ListTile(
title: const Text('Item 1'),
onTap: () {
setState(() {
index = 1;
Navigator.pop(context);
});
},
),
ListTile(
title: const Text('Item 2'),
onTap: () {
setState(() {
Navigator.pop(context);
});
},
),
],
),
),
body: bodyWidgets[index]);
}
}
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