Path: utzoo!attcan!uunet!husc6!bloom-beacon!TUB.BITNET!net
From: net@TUB.BITNET (Oliver Laumann)
Newsgroups: comp.windows.x
Subject: XtCallbackNone etc.
Message-ID: <8812111548.AA07300@tub.UUCP>
Date: 11 Dec 88 15:48:14 GMT
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
Lines: 13

I don't understand the rationale behind the functions XtCallbackNone,
XtCallbackNonexclusive, XtCallbackExclusive, and XtCallbackPopdown.
Why are they called `callback' functions and why would one want to use
these functions instead of XtPopup and XtPopdown?

Usually, `callback functions' are provided by an application programmer
and called by the code implementing a widget.  The above mentioned
functions, however, are exported by the Toolkit.  Should they be put
into a callback list, and if so, into which one?

Regards,
--
Oliver Laumann              net@TUB.BITNET              net@tub.UUCP