Re: g_free() vs gtk_widget_destroy()

[Tristan Van Berkom <vantr touchtunes com>]

> > also emits a "destroy" that is meant to any reference
> > holders to a to drop the reference it's holding.
>
> I don't think to understand this... :(
> Can you tell me more about this?

when you call g_object_unref(G_OBJECT(widget));
your calling a member of the GObjectClass structure.
The GObject has a reference count and when its down
to "0" the GObject will call its "finalize" method.
in affect ... the GtkWidgetClass will override that
method (in the case of a GtkWidget or derivitive) and
call the original after its work (freeing anything a GtkWidget
has to free and emiting the "finalize"
signal on itself).

> And another one: if I have a container with a widget into it, before destroy
> the container should I destroy the contained widget or it is destroyed automatically?

the container widget will "unreference" all the widgets it contains. if
you dont want it to be destroyed:

g_object_ref...
gtk_container_add...

and then when the container is destroyed you still
have a reference to your widget.


Cheers,
                -Tristan

znt fabio virgilio it wrote:
> > From: Jeff Franks <jcf tpg com au>
>
> > g_free() frees raw memory allocated with g_new().
>
> Ah! So I should never use g_free() g_new() in normal context, right?
>
> > gtk_widget_destroy()
> > marks a widget for destruction when its reference count
> > reaches zero. It
>
> mmm... so I call gtk_widget_destroy() and GTK internally take trace of all
> references to it, so when there is no more references GTK destroy it, right?
>
> > also emits a "destroy" that is meant to any reference
> > holders to a to drop the reference it's holding.
>
> I don't think to understand this... :(
> Can you tell me more about this?
>
> And another one: if I have a container with a widget into it, before destroy
> the container should I destroy the contained widget or it is destroyed automatically?
>
> Thanks again!
>
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