NetNews Usenet Archive 1992 #16/NN_1992_16.iso/spool/comp/windows/x/motif/5200

Internet Message Format | 1992-07-24 | 1.7 KB

Path: sparky!uunet!mcsun!uknet!news.cs.bham.ac.uk!nhj
From: [e-mail] (Nick Jurascheck)
Newsgroups: comp.windows.x.motif
Subject: Bug in XmScale ??
Summary: Help requested regarding possible bug in XmScale widget.
Keywords: XmScale, help
Message-ID: <[e-mail]>
Date: 24 Jul 92 17:01:43 GMT
Sender: [e-mail]
Followup-To: [e-mail]
Organization: School of Computer Science, Univ of Birmingham, UK
Lines: 28
Nntp-Posting-Host: fattie

Hi !

My Motif application exhibits some very strange behaviour when the
user clicks on a slider, to in/de-crement its value by
XmNscaleMultiple. Under certain program conditions, this causes a
message dialog to pop up, in which case the value-changed callback
gets repeatedly called, as if in an infinite loop, instead of just
getting called once.  If the callback does not cause the dialog box to
pop up there is no problem. When the same callback is triggered by
dragging the slider bar, this problem does not occur at all.

Could this be a bug in Motif ? BTW I am using v1.0 on a DECstation
running Ultrix 4.2.

Any suggestions would be welcomed; if necessary I could post some
code, but it's on another machine, and in any case the code that
causes this problem is very standard stuff. All that is required to
cause this effect is to add an XmNvalueChanged callback to an XmScale
widget, and then popup a MessageDialog from inside the callback.

If this is a bug, is there a way I can work around it, perhaps even by
disabling the 'click on slider' facility? (I can't see how to do
this...)

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