vtkImageInteractorStyle and MouseWheelEvent

Hi everyone,

I try to use the mouse wheel on a vtkResliceImageViewer in a Qt window.

I try to add a callback to the vtkImageInteractorStyle like this:



QtVTKExample::QtVTKExample(QWidget *parent) : QWidget(parent)
{
	m_layout = new QVBoxLayout;

	m_window = vtkSmartPointer<vtkGenericOpenGLRenderWindow>::New();
	m_widget = new QVTKOpenGLWidget(this);
	m_widget->SetRenderWindow(m_window);

	m_image = vtkSmartPointer<vtkImageData>::New();

	m_mapper = vtkSmartPointer<vtkImageResliceMapper>::New();
	m_mapper->SetInputData(m_image);

	m_viewer = vtkSmartPointer<vtkResliceImageViewer>::New();
	m_viewer->SetRenderWindow(m_window);
	m_viewer->SetupInteractor(m_window->GetInteractor());
	m_viewer->GetImageActor()->SetMapper(m_mapper);

	addObservers();

	m_layout->addWidget(m_widget);
	setLayout(m_layout);
}


void WheelBackwardFunction (vtkObject*, long unsigned int, void*, void*)
{
	std::cout << "wheel backward" << std::endl;
}

void WheelForwardFunction (vtkObject*, long unsigned int, void*, void*)
{
	std::cout << "wheel forward" << std::endl;
}

void QtVTKExample::addObservers()
{
	m_wheelForward = vtkSmartPointer<vtkCallbackCommand>::New();
	m_wheelBackward = vtkSmartPointer<vtkCallbackCommand>::New();
	m_wheelForward->SetCallback(WheelForwardFunction);
	m_wheelBackward->SetCallback(WheelBackwardFunction);
	m_viewer->GetInteractorStyle()->AddObserver(vtkCommand::MouseWheelForwardEvent, m_wheelForward);
	m_viewer->GetInteractorStyle()->AddObserver(vtkCommand::MouseWheelBackwardEvent, m_wheelBackward);
}


The window opens, with no warnings but the callback function are never called.

What did I do wrong?

Thank you,

Romain

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