bon@robotics.jpl.nasa.gov (Bruce Bon) (04/11/91)
I have a problem using WCL, probably because I am a beginner at X, etc.
Following an example that came with WCL, I have successfully specified
something like:
1) *fsb*okCallback: WcPopdownCB(~)
where fsb is a file-selection-box widget. I have also done something like:
2) *mywindow.wcCallback: myProcCB( string)
where myProcCB was a simple callback procedure that was coded and registered
in my version of MRI. BUT when I try to furnish one of my callback procedures
to a callback list resource for popups:
3) *manipShell.wcClassName: TransientShell
*manipShell.wcChildren: manPop
*manPop.wcConstructor: XmCreateText
*manipShell.popupCallback: myProcCB
nothing happens -- it is as though the popupCallback resource is not
recognized at all.
One of the reference books that I have says:
Because Xt doesn't support a string to Callback resource converter,
callbacks cannot be specified in resource files.
and I could find no reference to type XtCallbackList except as an internal
structure with no type converter available. So how can example (1)
possibly work? Is there something in the Intrinsics that parses ~, etc. ?
Example 2 shows that I was successful in creating and registering my own
callback procedure. So if example 1 does work, why can't I get example 3
to work?
Answers or pointers to documentation that I may have overlooked would both
be appreciated. Thanks.
Bruce Bon
bon@robotics.jpl.nasa.gov
ACTUAL EXCERPTS AND QUESTION:
-------------------------------------------------------
Excerpts from resource files:
*operIF.wcPopups: lkbFsbShell, skbFsbShell, lomFsbShell, somFsbShell, \
aysShell, manipShell
*lkbFsbShell.fsb*okCallback: WcPopdownCB(~)
*manipShell.wcClassName: TransientShell
*manipShell.wcChildren: manPop
*manipShell.wcCallback: WcTraceCB( manipShell.wcCallback), OifDebugCB(manipShell.wcCallback)
*manipShell.popupCallback: WcTraceCB( manipShell.popupCallback)
*manPop.wcResFile: operif_manip.wcl
! operif_manip.wcl:
operif.wcChildren: manPop
*manPop.wcConstructor: XmCreateText
*manPop.wcCallback: WcTraceCB( manPop.wcCallback), OifDebugCB(manPop.wcCallback)
*manPop.popupCallback: WcTraceCB( manPop.popupCallback)
-------------------------------------------------------
Excerpt from file produced by
setenv XENVIRONMENT operif.wcl
operif >& operif.log
where operif is my version of MRI:
. . .
Wc pop-up: operif.operIF.manipShell of class TransientShell
Wc managed: operif.operIF.manipShell.manPop of class XmText
. . .
Wc managed: operif.operIF.menuBar.manip of class XmCascadeButton
. . .
TraceCB for operif.operIF.manipShell: manipShell.wcCallback
OifDebugCB: manipShell.wcCallback
TraceCB for operif.operIF.manipShell.manPop: manPop.wcCallback
OifDebugCB: manPop.wcCallback
-------------------------------------------------------
callback function OifDebugCB:
void OifDebugCB ( w, argString, unused )
Widget w;
char* argString;
caddr_t unused;
{
printf( "OifDebugCB: %s\n", argString);
}
-------------------------------------------------------
Question:
I understand that *manPop.popupCallback should have no effect, since the
XmText widget class has no such resource. But why, if the
*lkbFsbShell.fsb*okCallback works, doesn't the *manipShell.popupCallback
work as well?aw@BAE.BELLCORE.COM (Andrew Wason) (04/11/91)
(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