[FEATURE] Add backend preview for the YouTube Videos plugin

Classes/Hooks/PluginRenderer.php

+<?php
+
+namespace SGalinski\SgYoutube\Hooks;
+
+/***************************************************************
+ *  Copyright notice
+ *  (c) sgalinski Internet Services (https://www.sgalinski.de)
+ *  All rights reserved
+ *  This script is part of the TYPO3 project. The TYPO3 project is
+ *  free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 3 of the License, or
+ *  (at your option) any later version.
+ *  The GNU General Public License can be found at
+ *  http://www.gnu.org/copyleft/gpl.html.
+ *  This script is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *  This copyright notice MUST APPEAR in all copies of the script!
+ ***************************************************************/
+
+use TYPO3\CMS\Backend\Utility\BackendUtility;
+use TYPO3\CMS\Backend\View\PageLayoutView;
+use TYPO3\CMS\Backend\View\PageLayoutViewDrawItemHookInterface;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+use TYPO3\CMS\Form\Service\TranslationService;
+
+/**
+ * Class PluginRenderer
+ * Renders back-end preview for the SG YouTube Videos plugin
+ *
+ * @package SGalinski\SgYoutube\Hooks
+ */
+class PluginRenderer implements PageLayoutViewDrawItemHookInterface {
+	/**
+	 * Preprocesses the preview rendering of a content element of type "sg_youtube"
+	 *
+	 * @param PageLayoutView $parentObject Calling parent object
+	 * @param bool $drawItem Whether to draw the item using the default functionality
+	 * @param string $headerContent Header content
+	 * @param string $itemContent Item content
+	 * @param array $row Record row of tt_content
+	 * @return void
+	 */
+	public function preProcess(PageLayoutView &$parentObject, &$drawItem, &$headerContent, &$itemContent, array &$row) {
+		if ($row['list_type'] === 'sgyoutube_youtube') {
+
+			// Content element labels
+			$labelPluginName = BackendUtility::getLabelFromItemListMerged(
+				$row['pid'], 'tt_content', 'list_type', $row['list_type']
+			);
+			$labelHeader = BackendUtility::getItemLabel(
+				'tt_content', 'header'
+			);
+			$labelHeaderLink = BackendUtility::getItemLabel(
+				'tt_content', 'header_link'
+			);
+			$labelSubheader = BackendUtility::getItemLabel(
+				'tt_content', 'subheader'
+			);
+			$labelContentLink = BackendUtility::getItemLabel(
+				'tt_content', 'tx_sgcontentlink_contentlink'
+			);
+
+			// Make instance of TranslationService class
+			$translationServiceObject = GeneralUtility::makeInstance(TranslationService::class);
+
+			// Begin rendering of content element fields
+			// Plugin name
+			$headerContent = '<div style="padding: 0 4px 10px 0;border-bottom: 1px solid #CACACA;margin-bottom: 6px; font-weight:700;">' . $labelPluginName . '</div>';
+
+			// Header
+			if ($row['header']) {
+				if ($row['header_layout'] === '10') {
+					$headerContent .= '<p>' . $row['header'] . '</p>';
+				} elseif ($row['header_layout'] === '100') {
+					$headerContent .= '<div style="display:none;">' . $row['header'] . '</div>';
+				} else {
+					$headerContent .= '<h' . $row['header_layout'] . '>' . $row['header'] . '</h' . $row['header_layout'] . '>';
+				}
+			}
+
+			//Header link
+			if ($row['header_link']) {
+				$headerContent .= '<div><strong>' . $translationServiceObject->translate(
+						$labelHeaderLink
+					) . '&nbsp;(' . $translationServiceObject->translate(
+						$labelHeader
+					) . ')</strong>:&nbsp;' . $row['header_link'] . '</div>';
+			}
+
+			// Subheader
+			if ($row['subheader']) {
+				$headerContent .= '<div>' . '<strong>' . $translationServiceObject->translate(
+						$labelSubheader
+					) . '</strong>' . ':&nbsp;' . $row['subheader'] . '</div>';
+			}
+			// Content link
+			if ($row['tx_sgcontentlink_contentlink']) {
+				$headerContent .= '<div>' . '<strong>' . $translationServiceObject->translate(
+						$labelContentLink
+					) . '</strong>' . ':&nbsp;' . $row['tx_sgcontentlink_contentlink'] . '</div>';
+			}
+
+			// Set plugin options array
+			$pluginOptions = GeneralUtility::xml2array($row['pi_flexform'], 'T3:');
+
+			// Get the FlexForm configuration file
+			$xmlFilePath = $GLOBALS['TCA']['tt_content']['columns']['pi_flexform']['config']['ds']['sgyoutube_youtube,list'];
+			$xmlContent = GeneralUtility::getFileAbsFileName(
+				str_replace(
+					'FILE:EXT:', 'EXT:', $xmlFilePath
+				)
+			);
+
+			// Get contents of the FlexForm configuration file
+			$xmlString = file_get_contents($xmlContent);
+			$arrayJobs = GeneralUtility::xml2array($xmlString);
+
+			// Begin rendering of table
+			$itemContent .= '<br>' . '<table class="table table-striped">';
+
+			// Table header
+			$labelSettings = 'LLL:EXT:sg_youtube/Resources/Private/Language/locallang.xlf:settings';
+			$labelvalue = 'LLL:EXT:sg_youtube/Resources/Private/Language/locallang.xlf:values';
+			$itemContent .= '<row>' . '<th style="width: 50%">' . $translationServiceObject->translate(
+					$labelSettings
+				) . '</th>';
+			$itemContent .= '<th style="width: 50%">' . $translationServiceObject->translate(
+					$labelvalue
+				) . '</th>' . '</tr>';
+
+			// Table content rows
+			// Loop through plugin options
+			foreach ($pluginOptions['data']['sDEF']['lDEF'] as $key => $setting) {
+				// if plugin option exists within the Flexform configuration file
+				if (array_key_exists($key, $arrayJobs['sheets']['sDEF']['ROOT']['el'])) {
+					// Display label
+					$labelId = $arrayJobs['sheets']['sDEF']['ROOT']['el'][$key]['TCEforms']['label'];
+					$itemContent .= '<row>' . '<td><strong>' . $translationServiceObject->translate(
+							trim($labelId)
+						) . '</strong></td>';
+					// Display value
+					$itemContent .= '<td>' . $setting['vDEF'] . '</td>' . '</tr>';
+				}
+			}
+
+			// Record Storage
+			if ($row['pages'] !== '') {
+				// Record Storage Page label
+				$labelRecordStorage = 'LLL:EXT:frontend/Resources/Private/Language/locallang_ttc.xlf:pages.ALT.list_formlabel';
+
+				// Get storage page(s)
+				$backendUtilityObject = GeneralUtility::makeInstance(BackendUtility::class);
+				$storagePageIds = explode(',', $row['pages']);
+				$storagePages = [];
+
+				foreach ($storagePageIds as $i => $storagePageId) {
+					$storagePages[] = $backendUtilityObject->getRecord(
+							'pages', $storagePageId, 'title'
+						)['title'] . ' ' . '(' . $storagePageId . ')';
+				}
+
+				// Render 'Record Storage Page' row
+				$itemContent .= '<row>' . '<td><strong>' . $translationServiceObject->translate(
+						$labelRecordStorage
+					) . '</strong></td>';
+				$itemContent .= '<td>' . implode(', ', $storagePages) . '</td>' . '</tr>';
+			}
+
+			// End rendering of table
+			$itemContent .= '</table>';
+			$drawItem = FALSE;
+		}
+	}
+}

Resources/Private/Language/de.locallang.xlf

 <?xml version="1.0" encoding="utf-8" standalone="yes" ?>
 <xliff version="1.0">
-	<file source-language="en" target-language="de" datatype="plaintext" original="messages" date="2019-12-07T19:09:30Z">
+	<file source-language="en" target-language="de" datatype="plaintext" original="messages" date="2020-06-10T09:14:47Z">
 		<header>
 			<generator>LFEditor</generator>
 		</header>
@@ -49,6 +49,14 @@
 				<source><![CDATA[Maximum Amount]]></source>
 				<target><![CDATA[Maximale Anzahl]]></target>
 			</trans-unit>
+			<trans-unit id="settings" approved="yes">
+				<source><![CDATA[Settings]]></source>
+				<target><![CDATA[Einstellungen]]></target>
+			</trans-unit>
+			<trans-unit id="values" approved="yes">
+				<source><![CDATA[Values]]></source>
+				<target><![CDATA[Werte]]></target>
+			</trans-unit>
 		</body>
 	</file>
 </xliff>
\ No newline at end of file

Resources/Private/Language/locallang.xlf

@@ -38,6 +38,12 @@
 			<trans-unit id="maxResults">
 				<source><![CDATA[Maximum Amount]]></source>
 			</trans-unit>
+			<trans-unit id="settings">
+				<source><![CDATA[Settings]]></source>
+			</trans-unit>
+			<trans-unit id="values">
+				<source><![CDATA[Values]]></source>
+			</trans-unit>
 		</body>
 	</file>
-</xliff>
+</xliff>
\ No newline at end of file

ext_localconf.php

@@ -40,3 +40,6 @@ if (!defined('TYPO3_MODE')) {
 
 	]
 );
+//Hooks
+$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['cms/layout/class.tx_cms_layout.php']['tt_content_drawItem']['sg_youtube']
+	= \SGalinski\SgYoutube\Hooks\PluginRenderer::class;