[REBOL] Re: [scrolling] Scroll-wheel problem with area
From: carl:cybercraft at: 4-Aug-2004 20:41
>CR> I've been writing a routine to add scroll-wheel support to scripts
>CR> and I've hit a slight snag with stopping an area scrolling out of
>CR> the top of its box - ie, I can't see any way to do it. :-)
>CR> With text-lists you have lc and the length of the list's block to
>CR> control this, but I can't find how to get such values with an area
>CR> or any other way it could be done. With areas I'm changing
>CR> their para/scroll/y value to scroll them.
>Have you looked at the source for EDITOR? Here are some pertinent
> scroll-to: func [txt /local xy] [
> xy: (caret-to-offset t1 txt) - t1/para/scroll
> t1/para/scroll: min 0x0 t1/size / 2 - xy
> s1/data: (second xy) / max 1 second size-text t1
> show [s1 t1]
Ah! I had't twigged that size-text would work out the area of all the text in a face.
I kinda figured it'd be just what's displayed, so hadn't thought to use it. Thanks
Gregg! Updated version uploaded...
-- Carl Read