[vtkusers] Support for touchpad

[rakesh patil]

Hello,

I would like to know whether there is any APIs to handle trackpad events.
On MAC Book Pro (laptop) the trackpad produces flickering effect when we
drag over it. So, is it possible to get the smooth flow using trackpad, the
same way as we see using mouse scroll? I am not sure whether this is
reproducible in paraview.

Can someone give some update on this?

Thanks in advance

Regards
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