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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