[vtkusers] vtkWidgets or QGraphicsItem

[rahul kumar]

Hi all,
we are developing one application using VTK, QT in which
widgets need to be provided following features
1. Selection by mouse button down
2. cut, copy and paste
3. selected by rubber band rectangle
4. dragged and dropped
5. get selected widgets 
We are in confuse whether to use QGrahicsItems (
with QGraphcsScene QGraphicsView) or vtkWidgets.

though recently in vtkcontourWidgets translation and scaling features are added but still lacks many features.

can anybody suggest?

thanks and regards
rahul