[vtkusers] Callback not firing?

[Jeff Baumes]

I don't see in your code the line:

style->AddObserver(vtkCommand::SelectionChangedEvent,SelectionChangedCallback);

The interactor style invokes the event, so you need to attach the
callback to it.

Jeff

On Fri, Oct 16, 2009 at 8:32 AM, David Doria <daviddoria+vtk at gmail.com> wrote:
> I tried to make a little demo of using a callback by gathering bits from
> some of the tests.
>
> http://www.rpi.edu/~doriad/VTK_List/Callbacks/
>
> The documentation says that the left mouse button of
> vtkInteractorStyleRubberBand2D should trigger a SelectionChangedEvent. In
> this example, I'd expect when I used the rubber band I would see the output
> message "Callback!", but I don't see anything.
>
> I tried attaching the observer to the renderer, render window, and render
> window interactor. None of them seem to trigger the callback.
>
> Can anyone see where I've gone wrong? Is there any kind of tutorial on VTK
> callbacks/events anywhere? Google didn't seem to know of one.
>
> Thanks,
>
> David
>
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