[vtkusers] add keypress event in vtkSeedWidget

[Erkang Cheng]

Hi David,

Great. It works. Thanks for the help.

BTW,
Here is the detail. I add another observer using render window interactor.

renderWindowInteractor->AddObserver(vtkCommand::KeyPressEvent,
seedCallback);

Then add if-else block in the callback:

if (event == vtkCommand::KeyPressEvent)
       {
          std::cout<<"key press"<<std::endl;
       }


On Wed, Dec 17, 2014 at 5:17 AM, David Cole <DLRdave at aol.com> wrote:
>
> A "git grep" of the current git 'master' branch shows that only
> interactors and interactor styles actually invoke the KeyPress event:
>
> $ git grep -E "Invoke.*KeyPressEvent"
> GUISupport/Qt/QVTKInteractorAdapter.cxx:
> iren->InvokeEvent(vtkCommand::KeyPressEvent, e2);
> Interaction/Style/vtkInteractorStyleUser.cxx:
> this->InvokeEvent(vtkCommand::KeyPressEvent, NULL);
> Rendering/Core/vtkInteractorStyle.cxx:
> self->InvokeEvent(vtkCommand::KeyPressEvent,NULL);
> Rendering/Core/vtkRenderWindowInteractor.cxx:
> this->InvokeEvent(vtkCommand::KeyPressEvent, NULL);
> Rendering/OpenGL/vtkCarbonRenderWindowInteractor.cxx:
> me->InvokeEvent(vtkCommand::KeyPressEvent, NULL);
> Rendering/OpenGL/vtkCarbonRenderWindowInteractor.cxx:
> me->InvokeEvent(vtkCommand::KeyPressEvent, NULL);
> Rendering/OpenGL/vtkCarbonRenderWindowInteractor.cxx:
> me->InvokeEvent(vtkCommand::KeyPressEvent, NULL);
> Rendering/OpenGL/vtkWin32RenderWindowInteractor.cxx:
> this->InvokeEvent(vtkCommand::KeyPressEvent, NULL);
> Rendering/OpenGL/vtkXRenderWindowInteractor.cxx:
> me->InvokeEvent(vtkCommand::KeyPressEvent, NULL);
> Rendering/OpenGL2/vtkAndroidRenderWindowInteractor.cxx:
> this->InvokeEvent(vtkCommand::KeyPressEvent, NULL);
> Rendering/OpenGL2/vtkWin32OpenGLRenderWindowInteractor.cxx:
> this->InvokeEvent(vtkCommand::KeyPressEvent, NULL);
> Rendering/OpenGL2/vtkXOpenGLRenderWindowInteractor.cxx:
> me->InvokeEvent(vtkCommand::KeyPressEvent, NULL);
>
> You will have to call AddObserver on the render window interactor, or
> the current interactor style in order to receive the KeyPress event.
>
>
> HTH,
> David C.
>
>
>
> On Tue, Dec 16, 2014 at 8:09 PM, Erkang Cheng <ekyaya at gmail.com> wrote:
> > Hi all,
> >
> > I am playing with the vtkSeedWidget example, which is available from:
> > http://www.vtk.org/Wiki/VTK/Examples/Cxx/Widgets/SeedWidget
> >
> > I am stuck at how to add kepress event.
> >
> > I tried to add
> >  seedWidget->AddObserver(vtkCommand::KeyPressEvent,seedCallback);
> >
> > right after the following lines:
> >  seedWidget->AddObserver(vtkCommand::PlacePointEvent,seedCallback);
> >   seedWidget->AddObserver(vtkCommand::InteractionEvent,seedCallback);
> >
> >
> >  Another change is in class vtkSeedCallback::Execute
> > I add one if-else blcok to capture keypress event.
> >
> > virtual void Execute(vtkObject*, unsigned long event, void *calldata)
> >     {
> >       if (event == vtkCommand::KeyPressEvent)
> >        {
> >           std::cout<<"key press"<<std::endl;
> >        }
> >
> > ...
> >
> > }
> >
> >
> > However, the widget can not capture keypress event.
> >
> > Could anyone share the idea to add customized event in vtkSeedWidget?
> > Thanks.
> >
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