Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!apple!agate!ucbvax!bloom-beacon!dont-send-mail-to-path-lines
From: vtn@cs.utexas.EDU (Vinod Thankappan Nair)
Newsgroups: comp.windows.x
Subject: (none)
Message-ID: <9104090012.AA04743@nada.cs.utexas.edu>
Date: 9 Apr 91 00:12:26 GMT
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
Lines: 73

Hello,

	I have an application that needs to use a Motif DrawingArea
Widget.  This runs on a Stardent Titan, and the window is being  
used by a 3D package (Dore) for drawing images.

	The problem is, I need to create the actual window for the
Widget using a special Stardent-specific call (XBCreateWindow)
that  permits  Dore to directly call dedicated graphics hardware.
Therefore, at Widget creation time, I set the widget's instance
realize method to be a pointer to my realize function, that creates
an Xwindow of the kind I need. 

	So far so good, Dore is able to draw, events being handled
correctly (I think), BUT ...

   If I try to fit a Frame widget, or a Form widget around this
DrawingArea widget, it doesn't seem to  understand the drawing window's
geometry ( and God knows what else !)  and draws the window as a tiny
little square in a corner.  Note that  the window does show up 
normally with only ONLY a toplevel form above it, but add anything
else like a frame to it, and it doesn't work. 


Here's the stuff that I do in the realize :


 .....
 create_window(); 
    the  DrawingArea widget is Canvas. gatt is an XWindowAttributes structure.
    This sets up displayPtr and window.  To get this to work as much as it
    does, I also needed to ensure that the parent of the newly created
    window was the (window of the parent_widget) of canvas. Either
    that or an explicit XReparent call.
 .....

   XGetWindowAttributes(displayPtr, window, &gatt);

   canvas->core.window = window;

   canvas->core.x = (Position) 0;
   canvas->core.y = (Position) 0;
   canvas->core.width = (Dimension) gatt.width;
   canvas->core.height = (Dimension) gatt.height;
   canvas->core.depth = gatt.depth;
   canvas->core.border_width = (Dimension) 0;
   canvas->core.screen = gatt.screen;
   canvas->core.colormap = gatt.colormap;


   /* I don't think the stuff below this is needed, it would be done
      by procedures other than realize() at widget creation time */
   canvas->core.self = canvas;
   canvas->core.widget_class = XtClass(canvas);
   canvas->core.name = XtNewString("canvas");
   canvas->core.parent = parent_widget;
   canvas->core.sensitive = True;
   canvas->core.managed = True;
   canvas->core.mapped_when_managed = True;
 


  I think I have missed out something in the instance initialization procedure.
  
  Would somebody please help ?

  Thanx,


Vinod.

(vtn@cs.utexas.edu)