rename mvc at lvc

1 files changed, 95 insertions, 0 deletions

diff --git a/lvc/widgets/osx/helpers.py b/lvc/widgets/osx/helpers.py
new file mode 100644
index 0000000..e4aa23a
--- /dev/null
+++ b/lvc/widgets/osx/helpers.py
@@ -0,0 +1,95 @@
+# @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.
+
+"""helper classes."""
+
+import logging
+import traceback
+
+from Foundation import *
+from objc import nil
+
+class NotificationForwarder(NSObject):
+    """Forward notifications from a Cocoa object to a python class.
+    """
+
+    def initWithNSObject_center_(self, nsobject, center):
+        """Initialize the NotificationForwarder nsobject is the NSObject to
+        forward notifications for.  It can be nil in which case notifications
+        from all objects will be forwarded.
+
+        center is the NSNotificationCenter to get notifications from.  It can
+        be None, in which cas the default notification center is used.
+        """
+        self.nsobject = nsobject
+        self.callback_map = {}
+        if center is None:
+            self.center = NSNotificationCenter.defaultCenter()
+        else:
+            self.center = center
+        return self
+
+    @classmethod
+    def create(cls, object, center=None):
+        """Helper method to call aloc() then initWithNSObject_center_()."""
+        return cls.alloc().initWithNSObject_center_(object, center)
+
+    def connect(self, callback, name):
+        """Register to listen for notifications.
+        Only one callback for each notification name can be connected.
+        """
+
+        if name in self.callback_map:
+            raise ValueError("%s already connected" % name)
+
+        self.callback_map[name] = callback
+        self.center.addObserver_selector_name_object_(self, 'observe:', name,
+                self.nsobject)
+
+    def disconnect(self, name=None):
+        if name is not None:
+            self.center.removeObserver_name_object_(self, name, self.nsobject)
+            self.callback_map.pop(name)
+        else:
+            self.center.removeObserver_(self)
+            self.callback_map.clear()
+
+    def observe_(self, notification):
+        name = notification.name()
+        callback = self.callback_map[name]
+        if callback is None:
+            logging.warn("Callback for %s is dead", name)
+            self.center.removeObverser_name_object_(self, name, self.nsobject)
+            return
+        try:
+            callback(notification)
+        except:
+            logging.warn("Callback for %s raised exception:%s\n",
+                    name.encode('utf-8'),
+                    traceback.format_exc())