Path: utzoo!utgpu!water!watmath!clyde!att!ucbvax!decwrl!palo-alto!vixie
From: vixie@palo-alto.DEC.COM (Paul Vixie)
Newsgroups: comp.windows.x
Subject: Re: X Toolkit and continuous graphic output
Message-ID: <3579@palo-alto.DEC.COM>
Date: 25 Jul 88 20:23:50 GMT
References: <8807240059.AA13157@violet.berkeley.edu>
Organization: DEC Western Research Lab
Lines: 28

In <8807240059.AA13157@violet.berkeley.edu> rusty@VIOLET.BERKELEY.EDU writes:
# Suppose I have a program that continuously computes and generates
# graphic output; how can I wrap the toolkit around this program?  It
# seems to me that once I call XtMainLoop() I've given up control and
# there's no way for me to get to the main routine of my program that
# generates the output.

You say you want to "continuously" compute and display graphics; if this is
indeed the case, I assume that you want the toolkit to interrupt you in the
form of button callbacks getting called if the user clicks something.  You
should do:

	while (XtPending()) {
		XEvent xevent;

		XtNextEvent(&xevent);
		XtDispatchEvent(&xevent);
	}

This will give Xt a chance to do anything it could want to do, callback-wise.

If you look at the source for XtMainLoop(), you'll see that there's no
magic involved there, either.
-- 
Paul Vixie
Digital Equipment Corporation	Work:  vixie@dec.com	Play:  paul@vixie.UUCP
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