feat:增加提醒事项

lib/models/reminder.dart

@@ -0,0 +1,58 @@
+import 'package:hive/hive.dart';
+// flutter packages pub run build_runner build
+part 'reminder.g.dart';
+
+@HiveType(typeId: 1)
+class Reminder extends HiveObject {
+  @HiveField(0)
+  late int id;
+
+  @HiveField(1)
+  late String title;
+
+  @HiveField(2)
+  late String content;
+
+  @HiveField(3)
+  late DateTime scheduledTime;
+
+  @HiveField(4)
+  late DateTime createTime;
+
+  @HiveField(5)
+  late DateTime updateTime;
+
+  Reminder({
+    int? id,
+    required this.title,
+    required this.content,
+    required this.scheduledTime,
+    DateTime? createTime,
+    DateTime? updateTime,
+  }) {
+    // 简单时间戳ID
+    this.id = id ?? DateTime.now().millisecondsSinceEpoch ~/ 1000;
+    this.createTime = createTime ?? DateTime.now();
+    this.updateTime = updateTime ?? DateTime.now();
+  }
+
+  Reminder copyWith({String? title, String? content, DateTime? scheduledTime}) {
+    return Reminder(
+      id: id,
+      title: title ?? this.title,
+      content: content ?? this.content,
+      scheduledTime: scheduledTime ?? this.scheduledTime,
+      createTime: createTime,
+      updateTime: DateTime.now(),
+    );
+  }
+
+  static Reminder getEmpty() {
+    return Reminder(
+      id: DateTime.now().millisecondsSinceEpoch ~/ 1000,
+      title: '日常提醒',
+      content: '',
+      scheduledTime: DateTime.now().add(Duration(minutes: 5)),
+    );
+  }
+}