Re: GObjectClass->constructor revised, g_object_newv_with_data

[Tim Janik <timj gtk org>]

On Tue, 5 Jul 2005, Tim Janik wrote:

> On Tue, 7 Jun 2005, Gustavo J. A. M. Carneiro wrote:

> i'm not sure i fully understand your problems here, so far i see
> three use cases:
> 1) you create a GObject derived C object and have a PyObject proxy
> 2) you create a GObject derived Python object and have a PyObject proxy
> 3) you create a GObject derived Python object and have no PyObject proxy
[...]

> for (2), you derived from some GObject type, so you get to provide your own
> GInstanceInitFunc and can do something like:
>
> static __thread PyObject *current_proxy = NULL;
>
> static void
> python_gobject_init (GObject    *object,
>                     GTypeClass *g_class)
> {
>  PyObject *pob = current_proxy;
>  current_proxy = NULL;
>  python_proxy_attach (pob, object);
> }
>
> static void
> python_proxy_create_python_object (PyObject       *pob,
>                                   GType           python_gobject_type,
>                                   guint           n_parameters,
>                                   GParameter     *parameters)
> {
>  g_assert (current_proxy == NULL);
>  current_proxy = pob;
>  GObject *object = g_object_newv (python_gobject_type, n_parameters, 
> parameters);
> }
>
> and the extension to cover (3):
>
> static PyObject*
> create_python_gobject             (GType           python_gobject_type,
>                                   guint           n_parameters,
>                                   GParameter     *parameters)
> {
>  PyObject *pob = python_proxy_create();
>  python_proxy_create_python_object (pob, python_gobject_type,
>                                     n_parameters, parameters);
>  return pob;
> }

i need to correct myself here. (3) was meant to cover the case where
someone creates a python object from C code, i.e. via g_object_new().
so solving (3) does not involve writing a wrapper around g_object_newv(),
but demand creation of a python proxy in python_gobject_init(), i.e.
forget create_python_gobject() and apply the following:

 static void
 python_gobject_init (GObject    *object,
                     GTypeClass *g_class)
 {
  PyObject *pob = current_proxy;
  current_proxy = NULL;
+ if (!pob)
+   pob = python_proxy_create();
  python_proxy_attach (pob, object);
 }


> ---
> ciaoTJ

---
ciaoTJ