[vtkusers] Detect which QVTKWidget I am interacting with

[Girault, Alexis]

Thank you for your answer Alex. I tried to follow your advices but failed to do what I wanted.

INSTEAD I found a way of doing it : the callback function in AddObserver() can be implemented thess ways :
- void foo(void);
- void foo(vtkObject*, unsigned long, void*);

Therefore I created a function like the second one, and it appears the vtkObject * points on the object on which we add the observer. I could get the Interactor back by casting this vtkObject, and then also the renderWindow, and that's all I needed so I think I'll continue with this solution.

I think the documentation on this function is really poor. I was able to find out the "unsigned long" is the Id of the event, but no idea about the void* that is sent.

Thanks again, hope that may help someone else.
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