Hi,
I noticed a strange behavior in Racket slider% widget.
It seems that when I stop dragging the slider it makes two additional
unnecessary callback calls. This behavior is visible in the following
example:
(define frame (new frame% [label "Example"]))
(new slider% [parent frame]
[label "Test"]
[min-value 0]
[max-value 10]
[callback (lambda (slider event)
(display
(format "~a@~a: ~a~%"
(send event get-event-type)
(send event get-time-stamp)
(send slider get-value))))])
(send frame show #t)
Even a single click in the slider calls the callback twice
when the mouse button is released.
I also noticed that this behavior happens both with Racket in
Windows 7 and with the older DrScheme in Windows XP.
Is this a bug or a feature?
Thanks,
António Leitão
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