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lib/screen/dashboard/components/top_bar.dart

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+import 'package:flutter/material.dart';
+import 'package:timemanage/screen/projects_screen.dart';
+import 'package:timemanage/screen/reports_screen.dart';
+import 'package:timemanage/screen/export_screen.dart';
+import 'package:timemanage/screen/settings_screen.dart';
+import 'package:timemanage/screen/about_screen.dart';
+import 'package:timemanage/screen/course_screen.dart';
+
+class TopBar extends StatefulWidget implements PreferredSizeWidget {
+  const TopBar({Key? key}) : super(key: key);
+  @override
+  State<TopBar> createState() => _TopBarState();
+  @override
+  Size get preferredSize => const Size.fromHeight(kToolbarHeight);
+}
+
+class _TopBarState extends State<TopBar> {
+  @override
+  Widget build(BuildContext context) => AppBar(
+        backgroundColor: Colors.blueAccent, // 背景色
+        // 最前面的菜单按钮
+        leading: MenuBar(
+          children: <Widget>[
+            SubmenuButton(
+              menuChildren: <Widget>[
+                MenuItemButton(
+                  onPressed: () {
+                    Navigator.push(
+                      context,
+                      MaterialPageRoute(builder: (context) => SpaceWidget()),
+                    );
+                  },
+                  child: const Text('课程表'),
+                ),
+                MenuItemButton(
+                  onPressed: () {
+                    Navigator.push(
+                      context,
+                      MaterialPageRoute(
+                          builder: (context) => const ProjectsScreen()),
+                    );
+                  },
+                  child: const Text('项目'),
+                ),
+                MenuItemButton(
+                  onPressed: () {
+                    Navigator.push(
+                      context,
+                      MaterialPageRoute(
+                          builder: (context) => const ReportsScreen()),
+                    );
+                  },
+                  child: const Text('统计报告'),
+                ),
+                MenuItemButton(
+                  onPressed: () {
+                    Navigator.push(
+                      context,
+                      MaterialPageRoute(
+                          builder: (context) => const ExportScreen()),
+                    );
+                  },
+                  child: const Text('导入和导出'),
+                ),
+                MenuItemButton(
+                  onPressed: () {
+                    Navigator.push(
+                      context,
+                      MaterialPageRoute(
+                          builder: (context) => const SettingsScreen()),
+                    );
+                  },
+                  child: const Text('设置'),
+                ),
+                MenuItemButton(
+                  onPressed: () {
+                    Navigator.push(
+                      context,
+                      MaterialPageRoute(
+                          builder: (context) => const AboutScreen()),
+                    );
+                  },
+                  child: const Text('关于'),
+                ),
+              ],
+              child: const Icon(Icons.menu),
+            ),
+          ],
+        ),
+        // 标题
+        title: const Text('时间管理'),
+        actions: [
+          // 搜索按钮
+          IconButton(
+            icon: const Icon(Icons.search),
+            onPressed: () {},
+          ),
+          // 筛选按钮
+          IconButton(
+            icon: const Icon(Icons.filter_alt),
+            onPressed: () {},
+          )
+        ],
+      );
+}