Use CUnicode for width and height in ImageWidget

IPython/html/widgets/widget_image.py

@@ -1,36 +1,36 b''
 """ButtonWidget class.  
 
 Represents a button in the frontend using a widget.  Allows user to listen for
 click events on the button and trigger backend code when the clicks are fired.
 """
 #-----------------------------------------------------------------------------
 # Copyright (c) 2013, the IPython Development Team.
 #
 # Distributed under the terms of the Modified BSD License.
 #
 # The full license is in the file COPYING.txt, distributed with this software.
 #-----------------------------------------------------------------------------
 
 #-----------------------------------------------------------------------------
 # Imports
 #-----------------------------------------------------------------------------
 import base64
 
 from .widget import DOMWidget
-from IPython.utils.traitlets import Unicode, Bytes
+from IPython.utils.traitlets import Unicode, CUnicode, Bytes
 
 #-----------------------------------------------------------------------------
 # Classes
 #-----------------------------------------------------------------------------
 class ImageWidget(DOMWidget):
     view_name = Unicode('ImageView', sync=True)
     
     # Define the custom state properties to sync with the front-end
     format = Unicode('png', sync=True)
-    width = Unicode(sync=True) # TODO: C unicode
-    height = Unicode(sync=True)
+    width = CUnicode(sync=True)
+    height = CUnicode(sync=True)
     _b64value = Unicode(sync=True)
     
     value = Bytes()
     def _value_changed(self, name, old, new):
         self._b64value = base64.b64encode(new)
  No newline at end of file