Almost — thanks! (I'm sure I read over that page of the docs, but I somehow
missed 'vscroll.)
The one thing that isn't working is scrolling with the mouse/trackpad. It
seems like I might need to override on-subwindow-char to listen for
'wheel-up and 'wheel-down, which I can do, but I'm not finding how to
change the scrolling position of the panel if I do catch one of those
events. (Or maybe there's a way to do it without implementing it myself?)
-Philip
On Wed, Mar 1, 2017 at 5:39 PM, Alex Harsanyi <alexharsa...@gmail.com>
wrote:
> On Thursday, March 2, 2017 at 4:16:47 AM UTC+8, Philip McGrath wrote:
> > This seems like it should be a simple question, but I can't figure out
> how to get a scroll bar in a gui application like this one:
> >
> >
> > #lang racket/gui
> > (define frame
> > (new frame% [label "Example"]))
> > (for ([letter '("A" "B" "C" "D")])
> > (define grp
> > (new group-box-panel%
> > [parent frame]
> > [label letter]))
> > (for ([i (in-range 0 10)])
> > (new button%
> > [parent grp]
> > [label (number->string i)])))
> > (send frame show #t)
> >
> >
> > I can see something like what I have in mind in Dr. Racket's
> "Colors">"Color Schemes" preferences tab (at least on Mac OS), but I can't
> figure out how to do it.
> >
> >
> > Thanks,
> > Philip
>
> Does this do what you want?
>
> #lang racket/gui
>
> (define frame
> (new frame% [label "Example"] [height 300]))
> (for ([letter '("A" "B" "C" "D")])
> (define grp
> (new group-box-panel%
> [parent frame]
> [min-height 100]
> [label letter]))
> (define panel
> (new vertical-panel%
> [parent grp]
> [style '(vscroll)]
> [alignment '(left top)]))
> (for ([i (in-range 0 10)])
> (new button%
> [parent panel]
> [label (number->string i)])))
> (send frame show #t)
>
> Best Regards,
> Alex.
>
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