def calcDropTargetOffset(self):
dropTargetLocation = WidgetLocation(self.dropTarget, None)
self.dropTargetOffsetX = dropTargetLocation.getLeft() \
+ DOMUtil.getBorderLeft(self.dropTarget.getElement())
self.dropTargetOffsetY = dropTargetLocation.getTop() \
+ DOMUtil.getBorderTop(self.dropTarget.getElement())
