[vtkusers] self defined Mousewheel event handler does not work with Activiz VTK 7.0

[Liu_tj]

Hi, VTK guys,

Now I upgrade from Activiz for VTK 5.8 to 7.0. And I define the vtkInteractorStyleImage::MouseWheelForwardEvt and MouseWheelBackwardEvt for slice switch. With VTK 5.8, it works but now it doesn't work for 7.0. With VTK 7.0, these 2 event handlers keep the old behavior which zooms in or out. It does not call the function I define to switch the slice number. My code is as follow:


private void Display(vtkRenderWindow aRenderWindow, vtkAlgorithmOutput aData)
        {
            if (aData == null)
                return;
            m_imageViewer = vtkImageViewer2.New();
            m_imageViewer.SetInputConnection(aData);
            switch (m_sliceDirection)
            {
                case Direction.AXIAL:
                    m_imageViewer.SetSliceOrientationToXY();
                    break;
                case Direction.CORONAL:
                    m_imageViewer.SetSliceOrientationToYZ();
                    break;
                case Direction.SAGITTAL:
                    m_imageViewer.SetSliceOrientationToXZ();
                    break;
                default:
                    break;
            }


            m_imageViewer.GetSliceRange(ref m_minSliceNumber, ref m_maxSliceNumber);


            m_interactorStyle = vtkInteractorStyleImage.New();
            m_moveforward = new vtkObject.vtkObjectEventHandler(interactor_MouseWheelForwardEvt);
            m_movebackward = new vtkObject.vtkObjectEventHandler(interactor_MouseWheelBackwardEvt);
            
            m_interactorStyle.MouseWheelForwardEvt += m_moveforward;
            m_interactorStyle.MouseWheelBackwardEvt += m_movebackward;
vtkObject.vtkObjectEventHandler(interactor_MouseWheelBackwardEvt);
            
            aRenderWindow.GetRenderers().InitTraversal();


            m_renderer = aRenderWindow.GetRenderers().GetFirstRenderer();
            m_renderer.SetBackground(0.0, 0.0, 0.0);


            m_imageViewer.SetRenderWindow(aRenderWindow);
            vtkRenderWindowInteractor interactor = aRenderWindow.GetInteractor();
            interactor.SetInteractorStyle(m_interactorStyle);
            
            m_imageViewer.SetupInteractor(interactor);


            m_currentSlice = m_minSliceNumber + (m_maxSliceNumber - m_minSliceNumber) / 2;
            m_imageViewer.SetSlice(m_currentSlice);


            m_imageViewer.Render();
        } 

What's wrong with the code?


Thanks
Liu Peng


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