363         entity.view(vid or self.item_vid, w=self.w)

   363         entity.view(vid or self.item_vid, w=self.w)

   364 

   364 

   365 

   365 

   366 class ProgressMixIn(object):

   366 class ProgressMixIn(object):

   367     """provide default implementations for IProgress interface methods"""

   367     """provide default implementations for IProgress interface methods"""

   368 

   369 

   369     @property

   370     @property

   370     def cost(self):

   371     def cost(self):

   371         return self.progress_info()['estimated']

   372         return self.progress_info()['estimated']

   372 

   373