timemanager/lib/screen/dashboard_screen.dart

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 DashBoardScreen extends StatefulWidget {
  const DashBoardScreen({Key? key}) : super(key: key);

  @override
  _DashBoardScreenState createState() => _DashBoardScreenState();
}

class _DashBoardScreenState extends State<DashBoardScreen> {
  List<TimerModel> timers = [];

  void _addTimer() {
    final controller = TextEditingController();
    showDialog<String>(
      context: context,
      builder: (BuildContext context) {
        return AlertDialog(
          title: const Text('新计时器'),
          content: TextField(
            controller: controller,
            decoration: const InputDecoration(hintText: '计时器名称'),
          ),
          actions: <Widget>[
            TextButton(
              onPressed: () => Navigator.pop(context, 'Cancel'),
              child: const Text('取消'),
            ),
            TextButton(
              onPressed: () {
                final name = controller.text;
                if (name.isNotEmpty) {
                  setState(() {
                    timers.add(TimerModel(name: name));
                  });
                }
                Navigator.pop(context, 'OK');
              },
              child: const Text('OK'),
            ),
          ],
        );
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: 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) => SyllabusPage()),
                    );
                  },
                  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.add),
            onPressed: _addTimer,
          ),
          IconButton(
            icon: const Icon(Icons.filter_alt),
            onPressed: () {},
          )
        ],
      ),
      body: ListView.builder(
        itemCount: timers.length,
        itemBuilder: (context, index) {
          return Column(
            children: [
              ListTile(
                leading: CircleAvatar(
                  child: Text((index + 1).toString()),
                ),
                title: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Text(
                      timers[index].name,
                      style: const TextStyle(
                        fontSize: 18,
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                    StreamBuilder<int>(
                      stream: Stream.periodic(const Duration(milliseconds: 100),
                          (_) => timers[index].stopwatch.elapsed.inSeconds),
                      builder: (context, snapshot) {
                        final seconds = snapshot.data ?? 0;
                        final hours = seconds ~/ 3600;
                        final minutes = (seconds % 3600) ~/ 60;
                        final remainingSeconds = seconds % 60;
                        return Text(
                          '${hours.toString().padLeft(2, '0')}:${minutes.toString().padLeft(2, '0')}:${remainingSeconds.toString().padLeft(2, '0')}',
                          style: const TextStyle(
                            fontSize: 24,
                            fontWeight: FontWeight.bold,
                          ),
                        );
                      },
                    ),
                  ],
                ),
                trailing: Row(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    IconButton(
                      icon: timers[index].isActive
                          ? const Icon(Icons.pause)
                          : const Icon(Icons.play_arrow),
                      onPressed: () {
                        setState(() {
                          if (timers[index].isActive) {
                            timers[index].stop();
                          } else {
                            timers[index].start();
                          }
                        });
                      },
                    ),
                    IconButton(
                      icon: const Icon(Icons.delete),
                      onPressed: () {
                        setState(() {
                          timers[index].stopwatch.stop(); // 确保计时器停止以防止内存泄漏
                          timers.removeAt(index);
                        });
                      },
                    ),
                  ],
                ),
              ),
              const SizedBox(height: 10), // 添加间隔
            ],
          );
        },
      ),
    );
  }
}

class TimerModel {
  String name;
  Stopwatch stopwatch;
  bool isActive;

  TimerModel({required this.name})
      : stopwatch = Stopwatch(),
        isActive = false;

  void start() {
    stopwatch.start();
    isActive = true;
  }

  void stop() {
    stopwatch.stop();
    isActive = false;
  }

  void reset() {
    stopwatch.reset();
  }
}