feat:增加待办提醒功能

lib/utils/common.dart

@@ -0,0 +1,3 @@
+bool isSameDate(DateTime a, DateTime b) {
+  return a.year == b.year && a.month == b.month && a.day == b.day;
+}

lib/utils/notice.dart

@@ -0,0 +1,82 @@
+import 'package:flutter_local_notifications/flutter_local_notifications.dart';
+import 'package:hive/hive.dart';
+import 'package:timezone/timezone.dart' as tz;
+
+import '../models/task.dart';
+import 'common.dart';
+
+// 初始化通知
+Future<void> initNotify() async {
+  final notify = FlutterLocalNotificationsPlugin();
+  await notify.initialize(
+    const InitializationSettings(
+      windows: WindowsInitializationSettings(
+        appName: 'TaskHub',
+        appUserModelId: 'com.cxx.task',
+        guid: 'f47ac10b-58cc-4372-a567-0e02b2c3d479',
+        iconPath: 'assets/icons/app_icon.ico',
+      ),
+    ),
+  );
+}
+
+Future<void> showNotify(String title, String body) async {
+  final notify = FlutterLocalNotificationsPlugin();
+  final id = DateTime.now().millisecondsSinceEpoch.remainder(10000);
+
+  await notify.show(
+    id,
+    title,
+    body,
+    const NotificationDetails(windows: WindowsNotificationDetails()),
+  );
+}
+
+// 发送通知
+Future<void> scheduleNotification(
+  int id,
+  String title,
+  String body,
+  DateTime scheduleTime,
+) async {
+  final notify = FlutterLocalNotificationsPlugin();
+
+  final local = tz.getLocation('Asia/Shanghai');
+  final tzTime = tz.TZDateTime.from(scheduleTime, local);
+
+  await notify.zonedSchedule(
+    id,
+    title,
+    body,
+    tzTime,
+    const NotificationDetails(windows: WindowsNotificationDetails()),
+    androidScheduleMode: AndroidScheduleMode.exactAllowWhileIdle,
+  );
+}
+
+// 取消通知
+Future<void> cancelAllSchedule() async {
+  final notify = FlutterLocalNotificationsPlugin();
+
+  await notify.cancelAll();
+}
+
+void checkScheduleTime() {
+  final taskBox = Hive.box<Task>('taskBox');
+  final now = DateTime.now();
+
+  cancelAllSchedule();
+  for (var task in taskBox.values) {
+    if (task.scheduleTime != null &&
+        !task.isCompleted &&
+        isSameDate(task.scheduleTime!, DateTime.now()) &&
+        task.scheduleTime!.isAfter(now)) {
+      scheduleNotification(
+        task.id,
+        task.title,
+        task.desc ?? '',
+        task.scheduleTime!,
+      );
+    }
+  }
+}