feat:增加hive数据库

lib/models/task.dart

@@ -1,26 +1,54 @@
-class Task {
-  final int id;
+import 'package:hive/hive.dart';
+
+// flutter packages pub run build_runner build
+// part 'todo.g.dart';
+
+@HiveType(typeId: 0)
+class Task extends HiveObject {
+  @HiveField(0)
+  int id;
+
+  @HiveField(1)
   String title;
+
+  @HiveField(2)
   String? desc;
+
+  @HiveField(3)
   DateTime? dueDate;
-  DateTime? scheduleDate;
+
+  @HiveField(4)
+  DateTime? scheduleTime;
+
+  @HiveField(5)
   bool isCompleted;
-  Priority priority;
-  String? category;
+
+  @HiveField(6)
+  int priorityIndex;
+
+  @HiveField(7)
   DateTime createTime;
 
+  @HiveField(8)
+  DateTime updateTime;
+
+  Priority get priority => Priority.values[priorityIndex];
+
+  set priority(Priority value) => priorityIndex = value.index;
+
   Task({
     int? id,
     required this.title,
     this.desc,
     this.dueDate,
-    this.scheduleDate,
+    this.scheduleTime,
     this.isCompleted = false,
-    this.priority = Priority.medium,
-    this.category,
+    Priority priority = Priority.medium,
     DateTime? createTime,
   }) : id = id ?? DateTime.timestamp().microsecond,
-        createTime = DateTime.now();
+       this.priorityIndex = priority.index,
+       createTime = DateTime.now(),
+       updateTime = DateTime.now();
 }
 
-enum Priority { low, medium, high }
+enum Priority { low, medium, high }