code: def dragEnterEvent(self, event):
          
          super(AbstractDragView, self).dragEnterEvent(event)
          if event.mimeData().hasFormat("application/x-protocol"):
              event.setDropAction(QtCore.Qt.MoveAction)
              event.accept()
          else:
              event.ignore()
docs: Determines if the widget under the mouse can recieve the drop