"Virtual" Scrolling?

[SEGV <mlepage cgocable net>]

Is there an example somewhere I can look at of "virtual" scrolling? By that I
mean, instead of just putting a bigger widget in a smaller scrolling container,
actually drawing a scrolling container sized image myself based on the scroll
position.

That is, I want to have a pixmap the size of a scrolled window, which is drawn
to according to the scroll position, then copied into the scrolled window,
giving the impression of a much larger image.

I have everything working, except I can't see how to get the scroll position. In
fact, while I'm at it, I'd like to see how to programmatically set it also.

>From what I can figure out, my drawing area is in a viewport which is in a
scrolled window. The scrolled window and viewport have adjustments associated
with them, which do things when changed. I assume the default setup is to scroll
the drawing area when changed.

Is that correct? What should I be reading, the viewport's adjustments, or the
scrolled windows? I changed the adjustments programmatically but that did
nothing.

Thanks.

-- 
SEGV    http://www.cgocable.net/~mlepage/