On 11/7/06, David Nečas (Yeti) <yeti@xxxxxxxxxxxxxxx> wrote:
Thanks Yeti.
--DC
On Tue, Nov 07, 2006 at 06:56:41PM -0500, a dc wrote:
> I have a question regarding class initialization process. When we initialize
> and create GtkButton, it's class structure, GtkButtonClass, needs to be
> initialized. Also its parent class structures(GtkBinClass, GtkContainerClass
> etc.) have to be initialized. Where all this class initialization take place
> in gtk+ source code? Thanks.
gtk_foo_new() creates the new object with
g_object_new(GTK_TYPE_FOO, ...);.
GTK_TYPE_FOO is defined as gtk_foo_get_type().
So gtk_foo_get_type() is called and it calls
g_type_register_static() that passes the type information
(as the class init function) to GObject.
But before that gtk_foo_get_type() also uses
GTK_TYPE_FOO_PARENT, so all parent type information is
recursively registered.
Now we get into g_object_new(). It takes a reference on the
type class with g_type_class_ref().
g_type_class_ref() recursively references parent classes and
calls [an internal function that in turn calls] class_init()
method of the class.
Notes:
- Most of this of course occurs only the first time and
subsequent uses of the type go the fast code path.
- This is just the typical case.
Yeti
Thanks Yeti.
--DC
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