StandardPreviewRendererResolver.php

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<?php
 
declare(strict_types=1);
 
/*
 * 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!
 */
 
namespace ‪TYPO3\CMS\Backend\Preview;
 
use ‪TYPO3\CMS\Core\Utility\GeneralUtility;
 
class ‪StandardPreviewRendererResolver implements ‪PreviewRendererResolverInterface
{
    public function ‪resolveRendererFor(string $table, array $row, int $pageUid): ‪PreviewRendererInterface
    {
        ‪$tca = ‪$GLOBALS['TCA'][$table];
        $tcaTypeField = ‪$tca['ctrl']['type'] ?? null;
        $previewRendererClassName = null;
        if ($tcaTypeField) {
            $tcaTypeOfRow = $row[$tcaTypeField];
            $typeConfiguration = ‪$tca['types'][$tcaTypeOfRow] ?? [];
 
            $subTypeValueField = $typeConfiguration['subtype_value_field'] ?? null;
            if (!empty($typeConfiguration['previewRenderer'])) {
                if (!empty($subTypeValueField) && is_array($typeConfiguration['previewRenderer'])) {
                    // An array of subtype_value_field indexed preview renderers was defined, look up the right
                    // class to use for the sub-type defined in this $row.
                    $previewRendererClassName = $typeConfiguration['previewRenderer'][$row[$subTypeValueField] ?? ''] ?? null;
                }
 
                // If no class was found in the subtype_value_field
                if (!$previewRendererClassName && !is_array($typeConfiguration['previewRenderer'])) {
                    // A type-specific preview renderer was configured for the TCA type (and one was not detected
                    // based on the higher-priority lookups above).
                    $previewRendererClassName = $typeConfiguration['previewRenderer'];
                }
            }
        }
 
        if (!$previewRendererClassName) {
 
            // Table either has no type field or no custom preview renderer was defined for the type.
            // Use table's standard renderer if any is defined.
            $previewRendererClassName = ‪$tca['ctrl']['previewRenderer'] ?? null;
        }
 
        if (!empty($previewRendererClassName)) {
            if (!is_a($previewRendererClassName, PreviewRendererInterface::class, true)) {
                throw new \UnexpectedValueException(
                    sprintf(
                        'Class %s must implement %s',
                        $previewRendererClassName,
                        PreviewRendererInterface::class
                    ),
                    1477512798
                );
            }
            return GeneralUtility::makeInstance($previewRendererClassName);
        }
        throw new \RuntimeException(sprintf('No Preview renderer registered for table %s', $table), 1477520356);
    }
}