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/* -*-c-*- -------------- mvc.c :
* Implementation of the functions declared in mvc.h
* ------------------------------------------------------------------
* Last change: Time-stamp: "01/02/13 02:17:37 jose"
* ------------------------------------------------------------------
* Copyright (C) 2001 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#include "mvc.h"
/* clean up a subject */
void
subject_clean (subject_t *sub)
{
g_return_if_fail (sub != NULL);
g_slist_free (sub->observers);
}
/* add a new observer */
void
subject_add_observer (subject_t *sub, observer_t *obs)
{
g_return_if_fail (sub != NULL);
g_return_if_fail (obs != NULL);
sub->observers = g_slist_append (sub->observers, (gpointer)obs);
obs->subject = sub;
}
/* remove an observer */
void
subject_remove_observer (subject_t *sub, observer_t *obs)
{
g_return_if_fail (sub != NULL);
g_return_if_fail (obs != NULL);
sub->observers = g_slist_remove (sub->observers, (gpointer)obs);
}
/* observer notifier callback */
static void
update_callback (gpointer obs, gpointer data)
{
((observer_t *)obs)->update((observer_t *)obs, data);
}
/* notify all observers of a change */
void
subject_update_observers (subject_t *sub, data_t *data)
{
g_return_if_fail (sub != NULL);
g_slist_foreach (sub->observers, update_callback, data);
}
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