src/Forms/GridField/GridFieldDataColumns.php
public function getDisplayFields($gridField)
    {
        if (!$this->displayFields) {
            return singleton($gridField->getModelClass())->summaryFields();
        }
        return $this->displayFields;
    }
public function getDisplayFields($gridField)
    {
        if (!$this->displayFields) {
            return singleton($gridField->getModelClass())->summaryFields();
        }
        return $this->displayFields;
    }
public function getDisplayFields ( $ gridField ) { if ( ! $ this -> displayFields ) { return singleton ( $ gridField -> getModelClass ( ) ) -> summaryFields ( ) ; } return $ this -> displayFields ; }
Get the DisplayFields

@param GridField $gridField
@return array
@see GridFieldDataColumns::setDisplayFields
Get the DisplayFields