[vtkusers] My interactor style doesn't work

[arwtyxouymz]

Hi,

I'm trying to create my style subclass of vtkInteractorStyleImage.
I want to callback click event and mouse move event.

I referred to this example to display my dicom image, 
https://lorensen.github.io/VTKExamples/site/Cxx/IO/ReadDICOM/

and referred to this to create my style class.
https://www.vtk.org/Wiki/VTK/Examples/Cxx/Images/MarkKeypoints

DICOM image appear, but my mouse event does not work.
Following my code:

class MyStyle : public vtkInteractorStyleImage {
public:
    static MyStyle* New() {
        return nullptr;
    }
    vtkTypeMacro(MyStyle, vtkInteractorStyleImage);

    void OnLeftButtonDown() override {
        std::cout << "Left Button Clicked!" << std::endl;
        vtkInteractorStyleImage::OnLeftButtonDown();
    }

    void OnMouseMove() override {
        std::cout << "Mouse Moving!" << std::endl;
        vtkInteractorStyleImage::OnMouseMove();
    }

};


int main(int argc, char** argv) {
    // Verify input arguments
    if ( argc != 2 )
    {
        std::cout << "Usage: " << argv[0]
                  << " Filename(.img)" << std::endl;
        return EXIT_FAILURE;
    }
    std::string inputFilename = argv[1];

    vtkSmartPointer<vtkDICOMImageReader> reader =
            vtkSmartPointer<vtkDICOMImageReader>::New();
    reader->SetFileName(inputFilename.c_str());
    reader->Update();

    vtkSmartPointer<vtkImageViewer2> imageViewer =
            vtkSmartPointer<vtkImageViewer2>::New();
    imageViewer->SetInputConnection(reader->GetOutputPort());

    vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
            vtkSmartPointer<vtkRenderWindowInteractor>::New();
    vtkSmartPointer<MyStyle> style = vtkSmartPointer<MyStyle>::New();
    renderWindowInteractor->SetInteractorStyle( style );

    imageViewer->SetupInteractor(renderWindowInteractor);
    imageViewer->Render();
    imageViewer->GetRenderer()->ResetCamera();
    imageViewer->Render();

    renderWindowInteractor->Start();


    return EXIT_SUCCESS;

}


How change my code?
please help me!



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