Get Scrollbar position of a perspective component

Hi, I am trying to get the scrollbar position of a perspective PDFViewer component. I have tried following a few other posts but they all pertain to vision components and I can’t get them to work for perspective.

Why I need it: I have a script on my pdfviewer that allows me to navigate the pages using the mousewheel. however, I need the pdfviewer to be resizable (and thus have a y axis scroll bar at times). So my problem is that while trying to scroll through a single page, my script changes the page. so I would like to add something similar to “if scroll position equals 0 (top of page), change page” etc.

Thanks in advance,

Bump on this. It would be nice to be able to reset scroll bar positions.