* New version using pygtkmvc framework.

mvc/gtkmvc/observer.py

@@ -0,0 +1,56 @@
+#  -------------------------------------------------------------------------
+#  Author: Roberto Cavada <cavada@irst.itc.it>
+#
+#  Copyright (C) 2006 by Roberto Cavada
+#
+#  pygtkmvc is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU Lesser General Public
+#  License as published by the Free Software Foundation; either
+#  version 2 of the License, or (at your option) any later version.
+#
+#  pygtkmvc 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
+#  Lesser General Public License for more details.
+#
+#  You should have received a copy of the GNU Lesser General Public
+#  License along with this library; if not, write to the Free Software
+#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+#
+#  For more information on pygtkmvc see <http://pygtkmvc.sourceforge.net>
+#  or email to the author Roberto Cavada <cavada@irst.itc.it>.
+#  Please report bugs to <cavada@irst.itc.it>.
+#  -------------------------------------------------------------------------
+
+
+class Observer (object):
+    """Use this class as base class of all observers"""
+    
+    def __init__(self, model=None):
+        self.model = None
+        self.register_model(model)
+        return
+
+    def register_model(self, model):
+        self.unregister_model()
+        self.model = model
+        if self.model: self.model.register_observer(self)
+        return
+
+    def unregister_model(self):
+        if self.model:
+            self.model.unregister_observer(self)
+            self.model = None
+            pass
+        return
+
+    def __del__(self):
+        self.unregister_model()
+        return
+
+    def get_model(self): return self.model
+
+    pass # end of class
+
+    
+