dev/a11y_assessments/lib/use_cases/navigation_bar.dart

// 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';
import '../utils.dart';
import 'use_cases.dart';

class NavigationBarUseCase extends UseCase {
  NavigationBarUseCase() : super(useCaseCategory: UseCaseCategory.core);

  @override
  String get name => 'NavigationBar';

  @override
  String get route => '/navigation-bar';

  @override
  Widget build(BuildContext context) => const MainWidget();
}

class MainWidget extends StatefulWidget {
  const MainWidget({super.key});

  @override
  State<MainWidget> createState() => MainWidgetState();
}

class MainWidgetState extends State<MainWidget> {
  int currentPageIndex = 0;

  String pageTitle = getUseCaseName(NavigationBarUseCase());

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Semantics(headingLevel: 1, child: Text('$pageTitle Demo')),
      ),
      bottomNavigationBar: NavigationBar(
        onDestinationSelected: (int index) {
          setState(() {
            currentPageIndex = index;
          });
        },
        indicatorColor: Colors.amber[800],
        selectedIndex: currentPageIndex,
        destinations: const <Widget>[
          NavigationDestination(
            selectedIcon: Icon(Icons.home),
            icon: Icon(Icons.home_outlined),
            label: 'Home',
          ),
          NavigationDestination(icon: Icon(Icons.business), label: 'Business'),
          NavigationDestination(
            selectedIcon: Icon(Icons.school),
            icon: Icon(Icons.school_outlined),
            label: 'School',
          ),
        ],
      ),
      body: <Widget>[
        Container(alignment: Alignment.center, child: const Text('Page 1')),
        Container(alignment: Alignment.center, child: const Text('Page 2')),
        Container(alignment: Alignment.center, child: const Text('Page 3')),
      ][currentPageIndex],
    );
  }
}