| // 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 [BottomNavigationBar]. |
| |
| void main() => runApp(const BottomNavigationBarExampleApp()); |
| |
| class BottomNavigationBarExampleApp extends StatelessWidget { |
| const BottomNavigationBarExampleApp({super.key}); |
| |
| @override |
| Widget build(BuildContext context) { |
| return const MaterialApp( |
| home: BottomNavigationBarExample(), |
| ); |
| } |
| } |
| |
| class BottomNavigationBarExample extends StatefulWidget { |
| const BottomNavigationBarExample({super.key}); |
| |
| @override |
| State<BottomNavigationBarExample> createState() => _BottomNavigationBarExampleState(); |
| } |
| |
| class _BottomNavigationBarExampleState extends State<BottomNavigationBarExample> { |
| int _selectedIndex = 0; |
| final ScrollController _homeController = ScrollController(); |
| |
| Widget _listViewBody() { |
| return ListView.separated( |
| controller: _homeController, |
| itemBuilder: (BuildContext context, int index) { |
| return Center( |
| child: Text( |
| 'Item $index', |
| ), |
| ); |
| }, |
| separatorBuilder: (BuildContext context, int index) => const Divider( |
| thickness: 1, |
| ), |
| itemCount: 50); |
| } |
| |
| @override |
| Widget build(BuildContext context) { |
| return Scaffold( |
| appBar: AppBar( |
| title: const Text('BottomNavigationBar Sample'), |
| ), |
| body: _listViewBody(), |
| bottomNavigationBar: BottomNavigationBar( |
| items: const <BottomNavigationBarItem>[ |
| BottomNavigationBarItem( |
| icon: Icon(Icons.home), |
| label: 'Home', |
| ), |
| BottomNavigationBarItem( |
| icon: Icon(Icons.open_in_new_rounded), |
| label: 'Open Dialog', |
| ), |
| ], |
| currentIndex: _selectedIndex, |
| selectedItemColor: Colors.amber[800], |
| onTap: (int index) { |
| switch (index) { |
| case 0: |
| // only scroll to top when current index is selected. |
| if (_selectedIndex == index) { |
| _homeController.animateTo( |
| 0.0, |
| duration: const Duration(milliseconds: 500), |
| curve: Curves.easeOut, |
| ); |
| } |
| case 1: |
| showModal(context); |
| } |
| setState( |
| () { |
| _selectedIndex = index; |
| }, |
| ); |
| }, |
| ), |
| ); |
| } |
| |
| void showModal(BuildContext context) { |
| showDialog<void>( |
| context: context, |
| builder: (BuildContext context) => AlertDialog( |
| content: const Text('Example Dialog'), |
| actions: <TextButton>[ |
| TextButton( |
| onPressed: () { |
| Navigator.pop(context); |
| }, |
| child: const Text('Close'), |
| ) |
| ], |
| ), |
| ); |
| } |
| } |