function makeChangeValidator() {
      var self;
      return (self = {
        dataLength: 0,
        width: 0,
        height: 0,
        resizeRequiresRefresh: function(newWidth, newHeight) {
          var requiresRefresh = self.dataLength &&
            newWidth && newWidth !== self.width &&
            newHeight && newHeight !== self.height;

          self.width = newWidth;
          self.height = newHeight;

          return !!requiresRefresh;
        },
        dataChangeRequiresRefresh: function(newData) {
          var requiresRefresh = newData.length > 0 || newData.length < self.dataLength;

          self.dataLength = newData.length;

          return !!requiresRefresh;
        }
      });
    }