The X / Y property indicates the (x,y)-position of the cursor, relative to the upper-left corner of the control, when dragging operation begins. The OffsetX / OffsetY property specifies the (x,y)-position of the layer, relative to the upper-left corner of the control. The  OffsetXValid / OffsetYValid property to validate the (x,y)-position of the layer. For instance, you can use the OffsetYValid property on "0", and so no vertical movement is allowed.

The following properties can be used during dragging to determine the horizontal / vertical offset:

• X property indicates the x-position of the cursor, when the drag operation starts.
• Y property indicates the y-position of the cursor, when the drag operation starts.
• CurrentX property indicates the current x-position of the cursor, while dragging the layer.
• CurrentY property indicates the current y-position of the cursor, while dragging the layer.
• Delta property, returns the distance between clicking and current points.
• DeltaX property returns the offset on the x-coordinate of the the current drag operation, equivalent with the value of CurrentX - X.
• DeltaY property returns the offset on the y-coordinate of the the current drag operation, equivalent with the value of CurrentY - Y.

The DeltaAngle property specifies the angle (in degrees) that has been rotated the layer/object, during the drag operation.