From 28d1b39edb08deff4edd50c7529c96aa23e39efe Mon Sep 17 00:00:00 2001
From: jaortega <jaortega>
Date: Wed, 14 Feb 2001 23:24:06 +0000
Subject: new MVC library

---
 mixmvc/mvc.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 mixmvc/mvc.c

(limited to 'mixmvc/mvc.c')

diff --git a/mixmvc/mvc.c b/mixmvc/mvc.c
new file mode 100644
index 0000000..dcd254f
--- /dev/null
+++ b/mixmvc/mvc.c
@@ -0,0 +1,69 @@
+/* -*-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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