1 files changed, 56 insertions, 0 deletions
diff --git a/mvc/widgets/gtk/weakconnect.py b/mvc/widgets/gtk/weakconnect.py
new file mode 100644
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+++ b/mvc/widgets/gtk/weakconnect.py
@@ -0,0 +1,56 @@
+# @Base: Miro - an RSS based video player application
+# Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011
+# Participatory Culture Foundation
+#
+# 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+#
+# In addition, as a special exception, the copyright holders give
+# permission to link the code of portions of this program with the OpenSSL
+# library.
+#
+# You must obey the GNU General Public License in all respects for all of
+# the code used other than OpenSSL. If you modify file(s) with this
+# exception, you may extend this exception to your version of the file(s),
+# but you are not obligated to do so. If you do not wish to do so, delete
+# this exception statement from your version. If you delete this exception
+# statement from all source files in the program, then also delete it here.
+
+"""weakconnect.py -- Connect to a signal of a GObject using a weak method
+reference.  This means that this connection will not keep the object alive.
+This is a good thing because it prevents circular references between wrapper
+widgets and the wrapped GTK widget.
+"""
+
+from mvc import signals
+
+class WeakSignalHandler(object):
+    def __init__(self, method):
+        self.method = signals.WeakMethodReference(method)
+
+    def connect(self, obj, signal, *user_args):
+        self.user_args = user_args
+        self.signal_handle = obj.connect(signal, self.handle_callback)
+        return self.signal_handle
+
+    def handle_callback(self, obj, *args):
+        real_method = self.method()
+        if real_method is not None:
+            return real_method(obj, *(args + self.user_args))
+        else:
+            obj.disconnect(self.signal_handle)
+
+def weak_connect(gobject, signal, method, *user_args):
+    handler = WeakSignalHandler(method)
+    return handler.connect(gobject, signal, *user_args)