How to enable Pan and Zoom in a QGraphicsView

Question

I am using python and Qt Designer to implement loading tiff images and to enable Pan and Zoom on some mouse event (wheel - zoom, press wheel - pan).

I was looking in

Answer 1

It is possible to open TIFF files up to several gigabytes with ordinary PIL (pillow) library. It is not quite easy, but it works.

You could see the example here, second example after bold EDIT string could open, move and zoom TIFF files.