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Fix OpenVR grip button in vtkOpenVRRenderWindowInteractor::DoOneEvent

Mayeul Chassagnard requested to merge mayeul.chassagnard/vtk:Fix-OpenVR-MiddleButton-2017.03.17 into master

This fix has been done to let the user custom the OpenVR grip button (vr::EVRButtonId::k_EButton_Grip) by either

  • adding an Observer on vtkCommand::MiddleButtonReleaseEvent (::MiddleButtonPressEvent)
  • overriding vtkInteractorStyle3D::OnMiddleButtonUp() (::OnMiddleButtonDown()) or even overriding vtkOpenVRInteractorStyle (a vtkInteractorStyle3D subclass)

The same logic has been conserved for this button which is to load the next camera position when the release event is triggered.

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