How to capture mouse move event?

Development
1

I am struggling with capturing mouse move event.
e.g. I have this custom style and set it to the interactor.

namespace {

  class vtkMouseMoveStyle : public vtkInteractorStyleTrackballCamera
  {
  public:
    static vtkMouseMoveStyle* New();
    vtkTypeMacro(vtkMouseMoveStyle, vtkInteractorStyleTrackballCamera);

    virtual void OnLeftButtonUp() override
    {
      // Forward events
      vtkInteractorStyleTrackballCamera::OnLeftButtonUp();

      
    }

    virtual void OnMouseMove() override
    {
        std::cout << "Mouse moved!";
    }
  };

  vtkStandardNewMacro(vtkMouseMoveStyle);

} // namespace

But the OnMouseMove() method here only fires when I am holding left/right button and moving my mouse.
I would like to capture the event as soon as the cursor location changes inside the viewport. Can anyone point me to the right direction?

Thanks,
Cameron

2

Are you using Qt by any chance? In Qt, you have to enable mouse tracking in order to get mouse move events also when no button is pressed.