[vtkusers] GetKeySym and GetKeyCode for QVTKRenderWindowInteractor

[Greg Schussman]

Oops.

I forgot to mention that I'm using python-2.6, vtk-5.10.1, and qt-4.6.1.

Greg



On Thu, Aug 28, 2014 at 2:14 PM, Greg Schussman <greg.schussman at gmail.com>
wrote:

> Hi.
>
> I've got a working python vtk demo that uses a vtkRenderWindowInteractor,
> with the style set to vtkInteractorStyleTrackballCamera.  I run into a
> problem when I try to embed this in Qt.
>
> I use interactor.AddObserver('KeyPressEvent', key_handler) to see key
> presses and act on them.
>
> In my key_handler function, I query the interactor (passed in as an
> argument to key_handler) about which key was pressed.
>
> In my working example:
>
> when I press 'b',
> interactor.GetKeyCode() gives 'b', and
> interactor.GetKeySym() give 'b'.
>
> when I press esc,
> interactor.GetKeyCode() gives an unprintable character, and
> interactor.GetKeySym() gives 'Escape'.
>
> In my non-working Qt example, I use QVTKRenderWindowInteractor(frame)
> instead (copied from the VTK/Examples/Python/Widgets/EmbedPyQt example).
>
> now, when I press 'b',
> interactor.GetKeyCode() gives 'b', and
> interactor.GetKeySym() gives None.
>
> when I press esc,
> interactor.GetKeyCode() gives an unprintable character, and
> interactor.GetKeySym() gives None.
>
> So, originally, I used GetKeySym(), but when switching to the
> QVTKRenderWindowInteractor, that stopped working (always returning None).
> I'm concerned about possible inconsistencies from one linux machine to
> another when using GetKeyCode, so I'm reluctant to use it.
>
> What should I do here?  Is there any reason why the
> QTVTKRenderWindowInteractor would be giving None for the KeySym?
>
> For what it's worth, my demo code runs both with regular vtk and embedded
> in pyqt, and the mouse interaction is fine, and the '3' option does toggle
> stereo in both cases.  But for some reason my observer can see the key with
> GetKeySym in regular vtk mode, but not in embedded pyqt mode.
>
> Thanks in advance for any help or suggestions.
>
> Greg
>
>
>
>
>
>
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