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.h | 105 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 105 insertions(+)
 create mode 100644 mixmvc/mvc.h

(limited to 'mixmvc/mvc.h')

diff --git a/mixmvc/mvc.h b/mixmvc/mvc.h
new file mode 100644
index 0000000..6371a27
--- /dev/null
+++ b/mixmvc/mvc.h
@@ -0,0 +1,105 @@
+/* -*-c-*- ---------------- mvc.h :
+ * This header defines basic types supporting the MVC pattern
+ * ------------------------------------------------------------------
+ *  Last change: Time-stamp: <01/02/13 02:16:08 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.
+ *  
+ */
+
+
+#ifndef MVC_H
+#define MVC_H
+
+#include <glib.h>
+
+/* the subject which is observed (the model) */
+typedef struct subject_t subject_t;
+
+/* subject's observer (the view) */
+typedef struct observer_t observer_t;
+
+/* list of observers (maintained by the subject) */
+typedef GSList observer_list_t;
+
+/* data used in callbacks */
+typedef void data_t;
+
+/* (virtual) function used by subject on each observer to notify an update */
+typedef void (*update_callback_t)(observer_t *obs, data_t *data);
+
+/* (virtual) function used by observers to notify subject of a change */
+typedef void (*notify_callback_t)(subject_t *subj, data_t *data);
+
+/* base subject type, containing a notify callback to be invoked
+   by observers */
+struct subject_t
+{
+  notify_callback_t notify;	/* notify callback used by observers */
+  observer_list_t *observers;	/* the list of current observers */
+};
+
+/* base observer type, containing an update callback (to be invoked by
+   the subject) and a pointer to the observed subject
+*/
+struct observer_t
+{
+  update_callback_t update;	/* update callback used by subject */
+  subject_t *subject;		/* observed subject */
+};
+
+
+/* subject interface */
+/* init a subject */
+#define subject_init(sub)			\
+do {						\
+  (sub)->notify = NULL;				\
+  (sub)->observers = NULL;			\
+} while (FALSE)
+
+/* clean up a subject */
+extern void
+subject_clean (subject_t *sub);
+
+/* add a new observer */
+extern void
+subject_add_observer (subject_t *sub, observer_t *obs);
+
+/* remove an observer */
+extern void
+subject_remove_observer (subject_t *sub, observer_t *obs);
+
+/* notify all observers of a change */
+extern void
+subject_update_observers (subject_t *sub, data_t *data);
+
+/* observer interface */
+/* init an observer */
+#define observer_init(obs)			\
+do {						\
+  (obs)->update = NULL;				\
+  (obs)->subject = NULL;			\
+} while (FALSE)
+  
+/* macro used by observers to notify their subject of a change */
+#define observer_notify_subject(obs, data)				\
+    (*((observer_t *)obs->subject->notify)((observer_t *)obs->subject,	\
+					   (data_t *)data))
+
+       
+#endif /* MVC_H */
+
-- 
cgit v1.2.3