[vtkusers] can I disable dragable and enable pickable ?

[Lloyd Fenelon]

Hello,

I would like to have actors that you can pick but not move/drag
when using the middle button of the mouse in TrackBallActor mode.

I tried :
actor->dragableOff()
actor->setDragable(0)

but I can always translate actors...
If I set pickable to 0 I can't move actors anymore but I can't pick either.
And I need to pick it!

Any suggestions ?

Thanks
Lloyd
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