Path: utzoo!attcan!uunet!husc6!mit-eddie!fenchurch.mit.edu!jbs
From: jbs@fenchurch.MIT.EDU (Jeff Siegal)
Newsgroups: comp.windows.x
Subject: Re: question regarding toolkit callback functions
Message-ID: <9711@eddie.MIT.EDU>
Date: 18 Jul 88 23:06:32 GMT
References: <8807172352.AA17403@special-k.ai.mit.edu>
Sender: uucp@eddie.MIT.EDU
Reply-To: jbs@fenchurch.MIT.EDU (Jeff Siegal)
Organization: MIT EE/CS Computer Facilities, Cambridge, MA
Lines: 27

In article <8807172352.AA17403@special-k.ai.mit.edu> sundar@WHEATIES.AI.MIT.EDU (Sundar Narasimhan) writes:
>[...]
>I have an application that has a rather complicated function bound to
>a command button's callback. Since this function takes a long time,
>ideally I would like to be able to provide feedback to the user at
>intermediate points [...]

Rather than execute the complicated function directly from the
callback, you could queue events to display the status messages and do
the processing:

	queue_event(display_message1)
	queue_event(processing_part_1)
	queue_event(display_message2)
	queue_event(processing_part_2)
	.
	.
	.

After queueing all the events, the command button callback would
return, and the events would be processed.

I don't see anything directly intended to be used as queue_event()
above, but perhaps you could use the timeout mechanism (maybe with a
zero or small time interval).

Jeff Siegal