feat:增加代办事项状态管理

lib/store/todo_dialog_store.dart

@@ -0,0 +1,82 @@
+import 'package:flutter/material.dart';
+import 'package:flisp_app/models/todo.dart';
+
+class TodoDialogStore extends ChangeNotifier {
+  String _title = '';
+  String _description = '';
+  DateTime? _dueDate;
+  TodoPriority _priority = TodoPriority.medium;
+  String? _category;
+
+  // Getters
+  String get title => _title;
+  String get description => _description;
+  DateTime? get dueDate => _dueDate;
+  TodoPriority get priority => _priority;
+  String? get category => _category;
+
+  // Setters
+  set title(String value) {
+    _title = value;
+    notifyListeners();
+  }
+
+  set description(String value) {
+    _description = value;
+    notifyListeners();
+  }
+
+  set dueDate(DateTime? value) {
+    _dueDate = value;
+    notifyListeners();
+  }
+
+  set priority(TodoPriority value) {
+    _priority = value;
+    notifyListeners();
+  }
+
+  set category(String? value) {
+    _category = value;
+    notifyListeners();
+  }
+
+  // 初始化编辑数据
+  void initEditData(TodoItem todo) {
+    _title = todo.title;
+    _description = todo.description ?? '';
+    _dueDate = todo.dueDate;
+    _priority = todo.priority;
+    _category = todo.category;
+    notifyListeners();
+  }
+
+  // 重置表单数据
+  void reset() {
+    _title = '';
+    _description = '';
+    _dueDate = null;
+    _priority = TodoPriority.medium;
+    _category = null;
+    notifyListeners();
+  }
+
+  // 验证表单
+  bool validate() {
+    return _title.trim().isNotEmpty;
+  }
+
+  // 创建待办事项对象
+  TodoItem createTodoItem({String? id, bool isCompleted = false, DateTime? createdAt}) {
+    return TodoItem(
+      id: id ?? DateTime.now().millisecondsSinceEpoch.toString(),
+      title: _title.trim(),
+      description: _description.trim().isEmpty ? null : _description.trim(),
+      dueDate: _dueDate,
+      priority: _priority,
+      category: _category,
+      isCompleted: isCompleted,
+      createdAt: createdAt ?? DateTime.now(),
+    );
+  }
+}