public function sortActive()
    {
        $sortIndex = $this->_sortIndex();
        if ($sortIndex === null) {
            return false;
        }
        return $sortIndex == $this->index();
    }
public function sortActive()
    {
        $sortIndex = $this->_sortIndex();
        if ($sortIndex === null) {
            return false;
        }
        return $sortIndex == $this->index();
    }
public function sortActive ( ) { $ sortIndex = $ this -> _sortIndex ( ) ; if ( $ sortIndex === null ) { return false ; } return $ sortIndex == $ this -> index ( ) ; }
Checks whether column is active by current sort index

@return bool
Checks whether column is active by current sort index