1

WPFDemo/TheListBox.xaml.cs

@@ -149,7 +149,9 @@ namespace WPFDemo
                     DropPopup.HorizontalOffset = ptLeftUp.X + x - ((FrameworkElement)ChildElement).ActualWidth / 2;
                     DropPopup.VerticalOffset = ptLeftUp.Y + y - ((FrameworkElement)ChildElement).ActualHeight / 2;
                 }
-                MoveListBoxStyle(e,true);
+
+                //蒙层打开,表明拖拽开始，设置透明度和显示状态
+                MoveListBoxStyle(e, true);
             }
             catch (Exception ex)
             {
@@ -159,7 +161,7 @@ namespace WPFDemo
         /// 移动效果
         /// </summary>
         /// <param name="boxItem"></param>
-        private void MoveListBoxStyle(MouseEventArgs e,bool isBool)
+        private void MoveListBoxStyle(MouseEventArgs e, bool isBool)
         {
             try
             {
@@ -170,12 +172,10 @@ namespace WPFDemo
                     {
                         if (item != ChildListBoxItem)//这就是其他控件
                         {
-                            double item_width = item.ActualWidth;
-                            double item_height = item.ActualHeight;
-                            double item_x = e.GetPosition(item).X;
-                            double item_y = e.GetPosition(item).Y;
-                            double Child_x = e.GetPosition(ChildElement).X;
-                            double Child_y = e.GetPosition(ChildElement).Y;
+                            double item_width = item.ActualWidth;   //当前行宽
+                            double item_height = item.ActualHeight; //当前行高
+                            double item_x = e.GetPosition(item).X;  //鼠标相对当前行X位移
+                            double item_y = e.GetPosition(item).Y;  //鼠标相对当前行Y位移
 
                             if (item_y <= item_height && item_y > 0 && item_x > 0 && item_x <= item_width)//鼠标进入哪一行,则将那一行变灰
                             {