[racket] gui application needs to perform operation upon closing of a window

Thanks, I've fixed those docs.

Robby


On Wed, May 22, 2013 at 9:06 PM, Stephen Chang <stchang at ccs.neu.edu> wrote:

> Ah ok I see now. I didn't look hard enough.
>
> I saw the "frame%" so I was clicking around here:
>
> http://docs.racket-lang.org/tools/drracket_unit.html?q=on-close#%28meth._%28%28%28lib._drracket%2Ftool-lib..rkt%29._drracket~3aunit~3aframe~25%29._on-close%29%29
>
> On Wed, May 22, 2013 at 7:59 PM, Matthias Felleisen
> <matthias at ccs.neu.edu> wrote:
> >
> > From the docs:
> >
> > "
> > method
> >   (send a-top-level-window on-close) → void?
> >
> > Refine this method with augment.
> > ...
> > "
> >
> >
> >
> > On May 22, 2013, at 7:14 PM, Stephen Chang wrote:
> >
> >> I was about to reply with the same answer as Matthias, but with
> >> define/override instead of define/augment, but I kept getting an
> >> error. Does it say anywhere in the docs whether a method is declared
> >> using pubment or public? I couldnt find it.
> >>
> >> On Wed, May 22, 2013 at 7:06 PM, Matthias Felleisen
> >> <matthias at ccs.neu.edu> wrote:
> >>>
> >>> Here we go:
> >>>
> >>> #lang racket/gui
> >>>
> >>> (define my-frame%
> >>>  (class frame%
> >>>    (super-new)
> >>>    (define/augment (on-close)
> >>>      (displayln "closing now"))))
> >>>
> >>> (define frame
> >>>  (new my-frame% [label "on closing"][width 300][height 200]))
> >>>
> >>> (send frame show #t)
> >>>
> >>>
> >>>
> >>> On May 22, 2013, at 6:55 PM, Zelah Hutchinson wrote:
> >>>
> >>>> From the documentation I gather that I need to augment the on-close
> method. I do not understand how to do this. Can someone show me a tiny
> example of how to perform an operation when a window is closed? Thank you.
> >>>>
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