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// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter/material.dart';
/// Flutter code sample for [NavigationBar].
void main() => runApp(const NavigationBarApp());
class NavigationBarApp extends StatelessWidget {
const NavigationBarApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
theme: ThemeData(useMaterial3: true),
home: const NavigationExample(),
);
}
}
class NavigationExample extends StatefulWidget {
const NavigationExample({super.key});
@override
State<NavigationExample> createState() => _NavigationExampleState();
}
class _NavigationExampleState extends State<NavigationExample> {
int currentPageIndex = 0;
@override
Widget build(BuildContext context) {
final ThemeData theme = Theme.of(context);
return Scaffold(
bottomNavigationBar: NavigationBar(
onDestinationSelected: (int index) {
setState(() {
currentPageIndex = index;
});
},
indicatorColor: Colors.amber,
selectedIndex: currentPageIndex,
destinations: const <Widget>[
NavigationDestination(
selectedIcon: Icon(Icons.home),
icon: Icon(Icons.home_outlined),
label: 'Home',
),
NavigationDestination(
icon: Badge(child: Icon(Icons.notifications_sharp)),
label: 'Notifications',
),
NavigationDestination(
icon: Badge(
label: Text('2'),
child: Icon(Icons.messenger_sharp),
),
label: 'Messages',
),
],
),
body: <Widget>[
/// Home page
Card(
shadowColor: Colors.transparent,
margin: const EdgeInsets.all(8.0),
child: SizedBox.expand(
child: Center(
child: Text(
'Home page',
style: theme.textTheme.titleLarge,
),
),
),
),
/// Notifications page
const Padding(
padding: EdgeInsets.all(8.0),
child: Column(
children: <Widget>[
Card(
child: ListTile(
leading: Icon(Icons.notifications_sharp),
title: Text('Notification 1'),
subtitle: Text('This is a notification'),
),
),
Card(
child: ListTile(
leading: Icon(Icons.notifications_sharp),
title: Text('Notification 2'),
subtitle: Text('This is a notification'),
),
),
],
),
),
/// Messages page
ListView.builder(
reverse: true,
itemCount: 2,
itemBuilder: (BuildContext context, int index) {
if (index == 0) {
return Align(
alignment: Alignment.centerRight,
child: Container(
margin: const EdgeInsets.all(8.0),
padding: const EdgeInsets.all(8.0),
decoration: BoxDecoration(
color: theme.colorScheme.primary,
borderRadius: BorderRadius.circular(8.0),
),
child: Text(
'Hello',
style: theme.textTheme.bodyLarge!
.copyWith(color: theme.colorScheme.onPrimary),
),
),
);
}
return Align(
alignment: Alignment.centerLeft,
child: Container(
margin: const EdgeInsets.all(8.0),
padding: const EdgeInsets.all(8.0),
decoration: BoxDecoration(
color: theme.colorScheme.primary,
borderRadius: BorderRadius.circular(8.0),
),
child: Text(
'Hi!',
style: theme.textTheme.bodyLarge!
.copyWith(color: theme.colorScheme.onPrimary),
),
),
);
},
),
][currentPageIndex],
);
}
}