[vtkusers] how implentment drag and drop operation from QWidget to QVTKWidget???

[Patrik Spring]

Who can give me a c++ example to implentment that QVTKWidget get a dragEnterEvent or dropEvent come from QT?
  In QVTKWidget.cxx, I see dropEvent() and dragEnterEvent() ,  but I try my best can not implentment this operation!!
  Must I reimplentment these method???? 
   Thank advanced!
  
  
		
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