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From: ramakris@bloss.cs.vt.edu (S.Ramakrishnan)
Newsgroups: comp.windows.x
Subject: Trapping the ConfigureRequest Event.
Message-ID: <552@creatures.cs.vt.edu>
Date: 19 Aug 90 00:42:37 GMT
Sender: usenet@creatures.cs.vt.edu
Reply-To: ramakris@bloss.cs.vt.edu (S.Ramakrishnan)
Distribution: na
Organization: Virginia Tech Computer Science, Blacksburg, VA
Lines: 53


 ConfigureRequest , override_redirect , SubstructureRedirectMask,
 XSelectInput , XtAddEventHandler.


 I want to be able to position my window at byte boundaries.
 However, the window manager doesn't always comply with my
 request for XMoveWindow.  Hence, I need to trap any ConfigRequest 
 and if its a reposition request, I need to position the window at
 the nearest 8-bit boundary. However, I want to take over
 the window only when a reposition request is obtained. And leave
 it to the WM at other times.
 
 Am doing the following :
 
   1. Select input with the SubstructureRedirectMask on the
      top level window of my application.

   2. Turn the override_redirect flag False (thats what the Xlib
      manual says I shud do).

   3. And then wait for the event.

   4. After obtaining the event :

      i) Turn the overridde_redirect flag of the window True.
     ii) Configure the Window by XConfigureWindow().
    iii) Turn the override_redirect flag False.

Strangely, I never get the event. The window manager always gets
the configure requests.

Am I missing s.th ?

Ps : In Widget domain can I not select the ConfigureRequest on
the Window of a Widget by

   {
   XtEventHandler my_handler ();
   XSetWindowAttributes wa;
   wa.override_redirect = False ;
   XChangeWindowAttributes(XtDisplay(canvas),XtWindow(canvas),CWOverrideRedirect,&wa);
   XtAddEventHandler(root,SubstructureRedirectMask,False,my_handler);
   }

Regards,

  S Ramakrishnan.

--

 -- S.Ramakrishnan, CS Dept, McBryde Hall, VaTech, Blacksburg, Virg. 24061-0106
   (email : ramakris@bloss.cs.vt.edu, ramakris@vtcc1.cc.vt.edu)