Path: utzoo!attcan!uunet!lll-winken!lll-tis!ames!mailrus!ukma!tut.cis.ohio-state.edu!bloom-beacon!RIACS.EDU!davy
From: davy@RIACS.EDU
Newsgroups: comp.windows.x
Subject: XtMainLoop -vs- XtAppMainLoop
Message-ID: <8812151918.AA09798@intrepid.riacs.edu>
Date: 15 Dec 88 19:18:49 GMT
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
Lines: 43


Here's a weird one.  I have an application which does the following:

	toplevelwidget = XtInititalize(....)

	CreateSomeWidgets();

	XtRealize(toplevelwidget);
	XFlush(...);

	/* generally the user positions the first widget through his wm
	   now, unless he specified a location for it */

	CreateSomeMoreWidgets();
	XtMainLoop();

All widgets are children of toplevelwidget (or some child of it).  If
I seem to have to call XFlush to map the toplevelwidget widgets so
that the widgets made in CreateSomeMoreWidgets will be mapped.  If I
leave out the XFlush, then they aren't mapped.  I assume this is
because the user's window manager hasn't asked him to position the
toplevelwidget window yet, and so it isn't mapped, meaning the children
don't get mapped either.

Anyway, this all works just fine.  The problem is when I try to use
XtAppMainLoop instead of XtMainLoop, since the manual says XtMainLoop
is obsolete.  I tried two different ways of calling it:

	XtAppMainLoop(XtCreateApplicationContext())
		- The widgets created in CreateSomeWidgets come up,
		  the ones in CreateSomeMoreWidgets do not.  The
		  widgets which do come up don't seem to receive
		  any of the events they're supposed to.

	XtAppMainLoop(XtWidgetToApplicationContext(toplevelwidget))
		- The widgets created in CreateSomeWidgets come up,
		  the ones in CreateSomeMoreWidgets do not.  The
		  events seem to work okay now, though.

What am I doing wrong?  I can't find much of an explanation about what
the application context is, or what it is for.  There's a little tiny
bit about it on page 21 of the Xt manual, but that's all I can find.

--Dave