Re: Subclasses

Ephrem Boudonnet <[email protected]> writes:

> Thanx for your answer.
> In fact, I need to specialize some gtk classes in order to assign them
> some special behaviours, for example, to catch differently the events,
> etc.
> The OpenMusic environment that I am trying to port on Linux with CLG
> requires a lot of flexibility for this kind of things: almost every
> graphical component must be able to be subclassed.

Ok, but keep i mind that you can not specialize on gtk "methods" which
could make subclassing less useful than it first may seem.

> We actually found another possible solution for subclassing gtk windows:
> 
> (setf gtkwindow-type (cdr (find 'window  glib::*registered-types* :key
> 'car) ))
> (glib::register-type 'om-window gtkwindow-type)

Of course, I didn't think about this solution but it should work. Although
the correct way to do it would be:

(glib:register-type-alias 'om-window 'window)

or even better, check out the latest code from CVS and use 

(glib:register-new-type 'om-window 'window)

which will register om-window as a new type in the gobject type system.

> (defclass om-window (om-graphic-object gtk::window) ()
>   (:metaclass gdk::gobject-class))
> 
> ... this seems to work for the moment (I can create instances of
> om-window like this)
> 
> Would you mind let me know what you think about it?

I think it should work, as long as you keep at least one Lisp reference
to instances of gtk subclasses (if you use register-new-type
you only need to do this if you add slots).

> I've got another question:
> When I try to colorize a layout, or any other widget, it seems that it
> doesn't give the right color
> for example blue is:
>  (make-instance 'gdk::color :red 0  :green 65535 :blue 0)
> Any idea?

This is a bug in the layout of the struct wrapper. I've committed a fix
to CVS.

-- 
Espen


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