Re: "Virtual" Scrolling?

[J Douglas Winters <winters cs utah edu>]

If I understand correctly what you want, you might want to look into
GtkAdjustment and [hv]scrollbars.  Just add a vertical and horizontal
scrollbars to a container, with the drawing area in the middle.  I believe
the tutorial has sufficient info on how to use an adjustments w/
scrollbars.  If not, I struggled through most of it before the tutorial
had anything, so send and email and I may be able to help.

Good luck.

--Doug

===========================================
J Douglas Winters   |   winters@cs.utah.edu
===========================================

On Sat, 7 Nov 1998, SEGV wrote:

> 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/
> 
> 
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