GridRow.php

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<?php
declare(strict_types = 1);
namespace TYPO3\CMS\Form\Domain\Model\FormElements;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

use TYPO3\CMS\Form\Domain\Exception\TypeDefinitionNotValidException;

class GridRow extends Section implements GridRowInterface
{

    public function addElement(FormElementInterface $formElement)
    {
        if ($formElement instanceof GridContainerInterface) {
            throw new TypeDefinitionNotValidException(
                sprintf('Grid containers ("%s") within grid rows ("%s") are not allowed.', $formElement->getIdentifier(), $this->getIdentifier()),
                1489413379
            );
        }

        $this->addRenderable($formElement);
    }

    public function createElement(string $identifier, string $typeName): FormElementInterface
    {
        $element = parent::createElement($identifier, $typeName);

        if ($element instanceof GridContainerInterface) {
            throw new TypeDefinitionNotValidException(
                sprintf('Grid containers ("%s") within grid rows ("%s") are not allowed.', $element->getIdentifier(), $this->getIdentifier()),
                1489413538
            );
        }

        return $element;
    }
}