whole_func_string: function() {
          var me = this;
          me.direction = Ext.String.toggle(me.direction, "ASC", "DESC");
          me.updateSortFunction();
      }
func_code_string: function() {
          var me = this;
          me.direction = Ext.String.toggle(me.direction, "ASC", "DESC");
          me.updateSortFunction();
      }
func_documentation_string: Toggles the sorting direction for this sorter.