RP-01_Flutter/lib/main.dart

import 'package:flutter/material.dart';
import 'Page/display_page.dart';
import 'Page/message_page.dart';
import 'Page/log_page.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'DMK-RP-01',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.lightBlue),
      ),
      home: const MyHomePage(title: 'DMK-RP-01 上位机'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  // 这个 widget 是应用程序的主页。它是有状态的，这意味着它有一个 State 对象（在下面定义），其中包含影响其外观的字段。

  // 这个类是状态的配置。它保存着由父级（在这种情况下是 App widget）提供的值（在这种情况下是标题），
  // 并由 State 的 build 方法使用。Widget 子类中的字段总是标记为 "final"。

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;
  // 添加状态变量记录当前页面
  int _currentPageIndex = 0;
  // 添加 GlobalKey
  final GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>();

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  // 添加页面切换方法
  void _changePage(int index) {
    setState(() {
      _currentPageIndex = index;
    });
    Navigator.pop(context);
  }

  @override
  Widget build(BuildContext context) {
    Widget currentBody;
    switch (_currentPageIndex) {
      case 0:
        currentBody = Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text('You have pushed the button this many times:'),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headlineMedium,
            ),
          ],
        );
        break;
      case 1:
        currentBody = DisplayPage();
        break;
      case 2:
        currentBody = MessagePage();
        break;
      case 3:
        currentBody = LogPage();
        break;
      default:
        currentBody = Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text('You have pushed the button this many times:'),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headlineMedium,
            ),
          ],
        );
    }

    return Scaffold(
      // 将 GlobalKey 赋值给 Scaffold
      key: _scaffoldKey,
      appBar: AppBar(
        leading: IconButton(
          icon: const Icon(Icons.menu),
          onPressed: () {
            // 使用 GlobalKey 打开导航栏
            _scaffoldKey.currentState?.openDrawer();
          },
        ),
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body: Center(
        child: currentBody,
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
      // 如果需要使用导航栏，需要添加 drawer 属性
      drawer: Drawer(
        child: ListView(
          padding: EdgeInsets.zero,
          children: <Widget>[
            ListTile(
              title: Text('主页'),
              onTap: () => _changePage(0),
            ),
            ListTile(
              title: Text('展示'),
              onTap: () => _changePage(1),
            ),
            ListTile(
              title: Text('报文'),
              onTap: () => _changePage(2),
            ),
            ListTile(
              title: Text('日志'),
              onTap: () => _changePage(3),
            ),
            ListTile(
              title: Text('设置'),
            )
          ],
        ),
      ),
    );
  }
}