code: public ChangedSizeHandler getChangedSizeHandler()
     {
        if (sizeHandler == null || sizeHandler instanceof ReadOnlyChangedSizeHandler)
        {
           return sizeHandler;
        }
  
        return new ReadOnlyChangedSizeHandler(sizeHandler.getNewSize(), sizeHandler.getPrevSize());
     }
docs: Returns {@link ChangedSizeHandler} instance currently
  injected.