Re: Access type to member procedure of instance (Object Oriented programming in Ada)

["Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>]

On Mon, 3 Dec 2012 12:21:45 -0800 (PST), ake.ragnar.dahlgren@gmail.com
wrote:

> However, I am currently toying with
> the idea of making Gtkada applications using Glade-3 which is very
> similiar but a little bit different.

My condolences...
 
>> 2. What is the problem?
>> 
>> Why handling Quit signal requires MVC, especially, because there is no such
>> 
>> signal, AFAIK?
> 
> There are two problems that together would require one to structure the
> code as I have done.
> 
> 1) Automated tests (AUnit). The code should be testable.

GUI is non-testable, too many states, some states are ill-defined, some are
real time dependent.

> Perhaps one would
> like to have a test that verifies that Gtk.Main.Main_Quit is called when
> the "destroy" event of Gtk_Object_Record is triggered from the main window
> and so on. To make the code testable one needs to separate the GUI code
> from the logic somehow.

That would be a GTK test = not a test of your code.

> 2) Perhaps one would like two have two views who are "connected" to the
> same controller instance (code reusability).

It is no problem at all. In the sample I provided the event handler takes
the window to destroy as a parameter.

> Not that I have in mind an actual real world application that would
> require two identical windows, but of theoretical interest. It is possible
> in other languages, and I'm thinking why not Ada?

It is already the way you wanted.

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