How to Prevent Blender 2.8 navigation buttons overriding in modal operator

Is there some way to prevent modal operator call when user click in Blender 2.8 navigation buttons (four rounded buttons at right upper corner - Hand, Zoom etc.)? Or how can i detect coordinates of this buttons to prevent from addon python code?

I’m writing my blender addon working in View3D with some mouse click handling. It is necessary when user clicks on Blender navigation buttons then addon should stop action performing. But how can I determine in my handler (modal function) that user clicked just into these buttons?