定义拖起前与放置前的事件

DeedyDesigner/Deedy.Activity/ActionViewer.cs

@@ -975,6 +975,56 @@ namespace Deedy.Activity
             // 事件触发前可以进行一定的处理逻辑
             RaiseEvent(args);
         }
+        /// <summary>
+        /// 准备拖动
+        /// </summary>
+		/// <remarks>
+        /// 在对象被拖动之前发生，可以被取消
+        /// </remarks>
+        public static readonly RoutedEvent PreviewActionDragEvent = EventManager.RegisterRoutedEvent("ActionDrag", RoutingStrategy.Tunnel,
+            typeof(EventHandler<CancelRoutedEventArgs>), typeof(ActionViewer));
+        /// <summary>
+        /// 事件「准备拖动」封装
+        /// </summary>
+        public event EventHandler<CancelRoutedEventArgs> PreviewActionDrag
+        {
+            add { AddHandler(PreviewActionDragEvent, value); }
+            remove { RemoveHandler(PreviewActionDragEvent, value); }
+        }
+        /// <summary>
+        /// 事件「准备拖动」触发
+        /// </summary>
+        /// <param name="args">事件参数</param>
+        protected virtual void RaiseEvent_PreviewActionDrag(CancelRoutedEventArgs args)
+        {
+            // 事件触发前可以进行一定的处理逻辑
+            RaiseEvent(args);
+        }
+        /// <summary>
+        /// 准备放置
+        /// </summary>
+		/// <remarks>
+        /// 在对象被放置之前发生，可以被取消
+        /// </remarks>
+        public static readonly RoutedEvent PreviewActionDropEvent = EventManager.RegisterRoutedEvent("ActionDrop", RoutingStrategy.Tunnel,
+            typeof(EventHandler<CancelRoutedEventArgs>), typeof(ActionViewer));
+        /// <summary>
+        /// 事件「准备放置」封装
+        /// </summary>
+        public event EventHandler<CancelRoutedEventArgs> PreviewActionDrop
+        {
+            add { AddHandler(PreviewActionDropEvent, value); }
+            remove { RemoveHandler(PreviewActionDropEvent, value); }
+        }
+        /// <summary>
+        /// 事件「准备放置」触发
+        /// </summary>
+        /// <param name="args">事件参数</param>
+        protected virtual void RaiseEvent_PreviewActionDrop(CancelRoutedEventArgs args)
+        {
+            // 事件触发前可以进行一定的处理逻辑
+            RaiseEvent(args);
+        }
         #endregion
     }
 }