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From: klamer@mi.eltn.utwente.nl (Klamer Schutte)
Newsgroups: comp.sys.atari.st.tech
Subject: Re: Going from X11 to GEM
Keywords: X11, GEM, Viola
Message-ID: <klamer.673195633@mi.eltn.utwente.nl>
Date: 2 May 91 14:47:13 GMT
Article-I.D.: mi.klamer.673195633
References: <1991Apr28.194206.1750@oz.plymouth.edu>
Sender: news@utrcu1.UUCP
Organization: University of Twente, BSC-El
Lines: 45

In <1991Apr28.194206.1750@oz.plymouth.edu> oddjob@oz.plymouth.edu (Andrew C. Stoffel) writes:

>Does anybody have any experience porting programs built on the X11
>model of client-server programs to GEM (or anything else) on the ST ?
>(I know..... I COULD wait until I could afford a TT and *nix..)

This is not as difficult as it seems. The other way around is a lot more
difficult!

What you have to do is:
0) When initialising the program register all client functions
   (You want to get a pointer to them).
1) make a endless loop in your program
2) put in there an event_multi and a (huge) switch statement
3) at all switch labels, see iff there is a client, and do him or
   if there is no client, do the default.

Here is an example of untested pseudo code:

register_clients();
while(1)
{
	event_multi( all options enabled );
	switch( type off message )
	case keyevent:
		find_active_window();
		if (there_is_a_client(window))
			(*do_client_function( window, key );
		else
			do_default_key_action(window);
		break;
	case mousevent:
		...
	...
}

>Anyone got any ideas ???  Comments ??? 
Comments ???

Klamer

-- 
Klamer Schutte
Faculty of electrical engineering -- University of Twente, The Netherlands
klamer@mi.eltn.utwente.nl	{backbone}!mcsun!mi.eltn.utwente.nl!klamer