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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: GTK and tasking (GNAT)
Date: Mon, 5 May 2014 09:33:46 +0200
Organization: cbb software GmbH
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Date: 2014-05-05T09:33:46+02:00
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On Sun, 04 May 2014 18:32:45 -0300, hreba wrote:

> I am talking about calculations that can be broken down, as in my 
> example at the beginning of this thread: I count from 1 to 10, update a 
> text box and call delay at each iteration, but the display changes only 
> after the termination of the loop.

You can find an example of how to do this in GtkAda here:

http://www.dmitry-kazakov.de/ada/aicwl.htm#12.6

The example performs a very lengthy calculation in an independent task and
among other updates a progress bar.

The method is still the one I described.

http://www.dmitry-kazakov.de/ada/gtkada_contributions.htm#1

You post data (e.g. the bar position) to the main loop from where the
action is performed.

So the plotter in the example is based on this technique as well. Its
refresh engine, which periodically updates the curves, is an Ada task that
posts Queue_Draw to the main loop.

There is no simple way of doing tasking in GUI.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de