[vtkusers] Intercepting a keypress with vtkInteractorStyleSwitch

[andyjk]

Can anyone help - this is driving me mad !

I am trying to read a keypress and so have copied the 'keypress' example on
the wiki :
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Interaction/KeypressEvents

However, I was using vtkInteractorStyleSwitch, and not
vtkInteractorTrackballCamera (as in the example) because I need the user to
be able to switch between styles.

The example works fine with vtkInteractorTrackballCamera, but if I
substitute the following in the new KeyPressInteractorStyle class:

class KeyPressInteractorStyle : public vtkInteractorStyleTrackballCamera
with
class KeyPressInteractorStyle : public vtkInteractorStyleSwitch

vtkTypeMacro(KeyPressInteractorStyle, vtkInteractorStyleTrackballCamera);
with
vtkTypeMacro(KeyPressInteractorStyle, vtkInteractorStyleSwitch);


vtkInteractorStyleTrackballCamera::OnKeyPress();
with
vtkInteractorStyleSwitch::OnKeyPress();

the interactor operates correctly but I don't get any outputs from the cout
statements saying keys were pressed.

Is it not possible to override a keypress if I am using
vtkInteractorStyleSwitch or am I doing something wrong ? 

Thanks

Andy

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