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From: aw@BAE.BELLCORE.COM (Andrew Wason)
Newsgroups: comp.windows.x.motif
Subject: Re: Problem with WCL/Motif
Message-ID: <9104102119.AA11842@bellcore.bellcore.com>
Date: 10 Apr 91 21:19:38 GMT
References: <1991Apr10.185914.18123@elroy.jpl.nasa.gov>
Sender: daemon@ucbvax.BERKELEY.EDU
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(Bruce Bon) writes:
> 	*manipShell.popupCallback:	myProcCB
> 
> nothing happens -- it is as though the popupCallback resource is not
> recognized at all.

I have the same problem.  It looks like there is a bug somewhere
in there (either in the Motif VendorShell or the Intrinsics).
I haven't figured it out yet.  I've attached a message I posted a while
ago about this problem below.

acs@pcc.amdahl.com (Tony Sumrall) has been having similar problems.

It seems like when an XtAddCallback is done on a callback list
which has callbacks derived from resources, bad things happen.

> *manipShell.wcClassName:	TransientShell
> *manipShell.popupCallback:	WcTraceCB( manipShell.popupCallback)

In this case, TransientShell is a subclass of VendorShell.
The Motif VendorShell does an XtAddCallback on the XmNpopupCallback
list.  This somehow wipes out your callback which got there via resources.


If anyone has any insight to this problem, let me know.

Andrew

_______________________________________________________________________________

Andrew Wason                                       Bell Communications Research
aw@bae.bellcore.com                                Piscataway, NJ
bellcore!bae!aw
_______________________________________________________________________________


------- Forwarded Message

Date:    Wed, 20 Mar 91 12:46:13 -0500
From:    Andrew Wason <aw@bae.bellcore.com>
To:      motif-talk%osf.org@bellcore.bellcore.com
Subject: XmNpopupCallback


Has anyone had any success using the Shell XmNpopupCallback resource?

I can't get it to work. Here is an Mri resource file which
adds a popupCallback.

  Mri.wcChildren:               button
  Mri.wcPopups:                 popup
  *button.wcClassName:          XmPushButton
  *button.activateCallback:     WcPopupCB( *popup )
  *popup.wcClassName:           TopLevelShell
  *popup.popupCallback:         WcSystemCB( echo popupCallback )
  *popup.wcChildren:            label
  *label.wcClassName:           XmLabel

The WcSystemCB callback should be called when
'popup' is popped up, but it isn't.

The same setup using Athena widgets and Ari works fine:

  Ari.wcChildren:               button
  Ari.wcPopups:                 popup
  *button.wcClassName:          Command
  *button.callback:             WcPopupCB( *popup )
  *popup.wcClassName:           TopLevelShell
  *popup.popupCallback:         WcSystemCB( echo popupCallback )
  *popup.wcChildren:            label
  *label.wcClassName:           Label


I think the problem is the Motif VendorShell widget.
VendorShell does an XtAddCallback on XmNpopupCallback
in its Initialize method.  At this point my WcSystemCB callback is
already on the list, but it looks like the VendorShells callback
replaces mine.  Later when my shell is popped up, and _XtPopup
does an XtCallCallbacks on XtNpopupCallback, there is only one
callback on the list -- the VendorShells.

Does anyone know how VendorShells callback could be wiping mine out?

Thanks,
Andrew

_______________________________________________________________________________

Andrew Wason                                       Bell Communications Research
aw@bae.bellcore.com                                Piscataway, NJ
bellcore!bae!aw

------- End of Forwarded Message