Path: utzoo!attcan!uunet!mcsun!ukc!harrier.ukc.ac.uk!rlh2
From: rlh2@ukc.ac.uk (Richard Hesketh)
Newsgroups: comp.windows.x
Subject: Where is my shell widget really positioned?
Message-ID: <4352@harrier.ukc.ac.uk>
Date: 7 Apr 90 17:03:02 GMT
Reply-To: rlh2@ukc.ac.uk (Richard Hesketh)
Organization: Computing Lab, University of Kent at Canterbury, UK.
Lines: 79

The following test program shows up a problem when it comes to knowing
where shells are positioned in Xt.

Compile the program with
	cc -o postest postest.c -lXaw -lXmu -lXt -lXext -lX11

.. and run it with the following ..

	postest -geometry +200+200

Now press the button.  What value do you get printed?  Under twm
(X11R4-no fixes), for me, the following is printed:

	Position of toplevel returned by GetValues() = +202+221

Now this is not what I gave it!  Infact this is the *real* position of
the toplevel window on the screen.

Who is correct?  Is the toolkit correct for returning the absolute
position on the screen or should it return the *real* geometry .. taking
into account that the window manager has reparented the window and
decorated it (I know the shellWidget knows about reparenting already) ?

Is the window manager correct in moving my window down and to the left to make
way for its decorations?

I ask this because I have an application that needs to save state and wants
to know where it is so that next time it is started up it can be placed in the
same place.  If I take the current values returned by GetValues() my
windows gradually drift off the screen!

Surely my program should not need to know that a window manager is
running (what is the shell widget for!) and have walk the window tree to find
the logical position on the screen?   Has the idea that applications
do not need to know that a window manager is running been dropped 8-) ?

I would really like to know whether I need to walk the window heirarchy
or not.

Thanks,

Richard Hesketh   :   @nsfnet-relay.ac.uk:rlh2@ukc.ac.uk
		  :   rlh2@ukc.ac.uk    ..!mcvax!ukc!rlh2
---                                               
Computing Lab., University of Kent at Canterbury,
Canterbury, Kent, CT2 7NF, United Kingdom.    Tel: +44 227 764000 ext 3682/7620

-----<cut here for postest.c <--------
#include<X11/Intrinsic.h>
#include<X11/StringDefs.h>
#include<X11/Xaw/Command.h>

/* ARGSUSED */
position(w, client_data, call_data)
Widget w;
XtPointer client_data, call_data;
{
	Position x, y;

	XtVaGetValues(XtParent(w), XtNx, &x, XtNy, &y, NULL);
	printf("Position of toplevel returned by GetValues() = +%d+%d\n",x, y);
}

main(argc, argv)
unsigned int argc;
char **argv;
{
	Widget toplevel, but;

	toplevel = XtInitialize("bugtest", "BugTest", (XrmOptionDescRec *)NULL,
				0, &argc, argv);
	but = XtCreateManagedWidget("bugTestLabel", commandWidgetClass,
				toplevel, (ArgList)NULL, 0);
	XtAddCallback(but, XtNcallback, position, (XtPointer)NULL);
	XtRealizeWidget(toplevel);

	XtMainLoop();
}
-----<end of postest.c<-------