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diff --git a/mvc/widgets/osx/viewport.py b/mvc/widgets/osx/viewport.py
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+# @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.
+
+""".viewport.py -- Viewport classes
+
+A Viewport represents the area where a Widget is located.
+"""
+
+from objc import YES, NO, nil
+from Foundation import *
+
+class Viewport(object):
+    """Used when a widget creates it's own NSView."""
+    def __init__(self, view, initial_frame):
+        self.view = view
+        self.view.setFrame_(initial_frame)
+        self.placement = initial_frame
+
+    def at_position(self, rect):
+        """Check if a viewport is currently positioned at rect."""
+        return self.placement == rect
+
+    def reposition(self, rect):
+        """Move the viewport to a different position."""
+        self.view.setFrame_(rect)
+        self.placement = rect
+
+    def remove(self):
+        self.view.removeFromSuperview()
+
+    def area(self):
+        """Area of our view that is occupied by the viewport."""
+        return NSRect(self.view.bounds().origin, self.placement.size)
+
+    def get_width(self):
+        return self.view.frame().size.width
+
+    def get_height(self):
+        return self.view.frame().size.height
+
+    def queue_redraw(self):
+        opaque_view = self.view.opaqueAncestor()
+        if opaque_view is not None:
+            rect = opaque_view.convertRect_fromView_(self.area(), self.view)
+            opaque_view.setNeedsDisplayInRect_(rect)
+
+    def redraw_now(self):
+        self.view.displayRect_(self.area())
+
+class BorrowedViewport(Viewport):
+    """Used when a widget uses the NSView of one of it's ancestors.  We store
+    the view that we borrow as well as an NSRect specifying where on that view
+    we are placed.
+    """
+    def __init__(self, view, placement):
+        self.view = view
+        self.placement = placement
+
+    def at_position(self, rect):
+        return self.placement == rect
+
+    def reposition(self, rect):
+        self.placement = rect
+
+    def remove(self):
+        pass
+
+    def area(self):
+        return self.placement
+
+    def get_width(self):
+        return self.placement.size.width
+
+    def get_height(self):
+        return self.placement.size.height