64 lines
1.8 KiB
Dart
64 lines
1.8 KiB
Dart
import 'package:flutter/material.dart';
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import 'pages/account_page.dart';
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import 'pages/manage_page.dart';
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import 'pages/stats_page.dart';
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import 'pages/study_page.dart';
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/// 应用外壳：底部四个主入口。
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///
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/// 用 [IndexedStack] 而不是直接切换 widget，是为了在切页时保留各页面的
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/// 状态（滚动位置、输入内容、进行中的学习会话）。
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class AppShell extends StatefulWidget {
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const AppShell({super.key});
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@override
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State<AppShell> createState() => _AppShellState();
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}
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class _AppShellState extends State<AppShell> {
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int _selectedIndex = 0;
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static const List<Widget> _pages = <Widget>[
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StudyPage(),
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ManagePage(),
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StatsPage(),
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AccountPage(),
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];
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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body: IndexedStack(index: _selectedIndex, children: _pages),
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bottomNavigationBar: NavigationBar(
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selectedIndex: _selectedIndex,
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onDestinationSelected: (int index) {
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setState(() => _selectedIndex = index);
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},
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destinations: const <NavigationDestination>[
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NavigationDestination(
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icon: Icon(Icons.school_outlined),
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selectedIcon: Icon(Icons.school),
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label: '学习',
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),
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NavigationDestination(
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icon: Icon(Icons.library_books_outlined),
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selectedIcon: Icon(Icons.library_books),
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label: '管理',
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),
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NavigationDestination(
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icon: Icon(Icons.insights_outlined),
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selectedIcon: Icon(Icons.insights),
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label: '统计',
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),
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NavigationDestination(
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icon: Icon(Icons.person_outline),
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selectedIcon: Icon(Icons.person),
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label: '账户',
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),
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],
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),
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);
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}
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}
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