On Wed, Jul 13, 2011 at 8:16 AM, Matthew Flatt <[email protected]> wrote: > At Wed, 13 Jul 2011 08:05:30 -0400, Carl Eastlund wrote: >> On Wed, Jul 13, 2011 at 7:50 AM, Matthew Flatt <[email protected]> wrote: >> > At Wed, 13 Jul 2011 13:20:57 +0400, "Yuriy Kovalev" wrote: >> >> In release notes for v5.1.1 written: "`racket/gui' library now supports >> >> scrolling panels". Despite this, I can't find in manual, how to use it. >> >> There >> >> are scrolls for canvas, but not for panels. Where I can see this >> >> information? >> > >> > The `panel%' class and subclasses accept 'hscroll and 'vscroll styles. >> > >> > See the next-to-last paragraph at >> > >> > http://docs.racket-lang.org/gui/panel_.html?q=panel%25 >> > >> > for more information. >> >> It appears that panels can only specify whether scrollbars are present >> or absent, while canvasses have a lot more control over what >> scrollbars do. Is there any particular barrier to adding the missing >> functionality to panels? > > Yes, but what would you like to do with panels that doesn't currently > work?
I don't have any pressing needs at the moment, myself. But when I have used canvases with scrollbars in the past, I've pretty much always fallen back on the manual scrollbar control to get the results I wanted, because I didn't just have a static image I wanted to scroll around in. For instance, in developing the (now long obsolete) object stepper, I wanted to compute what elements needed to be displayed on demand based on what area was visible, and I had controls that could move the scrollbars to bring relevant areas into view. Can the current panel setup do things like that? --Carl _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
