[vtkusers] switch interactor style depending on mouse position

[Thomas Ka]

Hello list!

Can you help me with the following problem?

I'd like to use an interactor style that works like a vtkInteractorStyleTrackballActor (move the actor) when the mouse is dragged above an actor, and when the mouse is dragged above the background the style should work like a vtkInteractorStyleTrackballCamera (move/rotate the scene).

Does such a style exist in VTK? If not, how can I build it? Is it possible to use a vtkInteractorStyleSwitch and call its methods SetCurrentStyleToTrackballActor/Camera at the beginning of each drag operation? How can I detect whether the dragging is performed above an actor or not? If possible, please give a link to some code snippets.

Thank you for any comment!
Thomas
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