Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!ucbvax!bloom-beacon!XEROX.COM!jalred.ElSegundo
From: jalred.ElSegundo@XEROX.COM
Newsgroups: comp.windows.x
Subject: XSelectInput - what am I doing wrong?
Message-ID: <900227-154552-595@Xerox>
Date: 27 Feb 90 23:45:38 GMT
Sender: JAlred.ElSegundo@xerox.com
Reply-To: JAlred.ElSegundo@xerox.com
Organization: The Internet
Lines: 44


 I have a widget for which I would like to receive VisibilityNotify events.  
However, I seem to be unable to select those events.  I retrieve the current
event mask of the window using XtBuildEventMask, OR in VisibilityChangeMask, 
and then set the event mask using XSelectInput.  This doesn't seem to work.  
  If I get the new event mask after I XSelectInput, it is set to the original event 
mask (the mask which was being used before I attempted to change it).  
  So what's the scoop?  Am I attempting to misuse XSelectInput?  My
configuration is SunSS1, SunOS4.0.3, X11R4, no fixes applied.  My code is 
below:

windowData.topLevel is a widget, created (before the XSelectInput call) by:
windowData.topLevel = XtInitialize("top", "Tool", NULL, 0, &argc, argv);

EventMask	eventMask, newEventMask;
Display		*myDisplay;
Window		myWindow;

myDisplay = XtDisplay(windowData.topLevel);
myWindow = XtWindow(windowData.topLevel);

eventMask = XtBuildEventMask(windowData.topLevel);
printf("eventMask of topLevel = %x\n",eventMask);

newEventMask = eventMask | VisibilityChangeMask;
printf("newEventMask = %x\n", newEventMask);

XSelectInput(myDisplay, myWindow, newEventMask);

eventMask = XtBuildEventMask(windowData.topLevel);
printf("eventMask of topLevel = %x\n",eventMask);


  This is the output of the printf's:
eventMask of topLevel = 220030
newEventMask = 230030
eventMask of topLevel = 220030

  Looks like newEventMask is getting assigned correctly (eventMask | (1L<<16)),
but not sticking.

  I'd appreciate any hints/solutions,

  Jim Alred  <jalred.elsegundo@xerox.com>