TYPO3CMS tt_content_drawItem hook example (TYPOCMS 6.2)

PageLayoutViewDrawItem.php

<?php
namespace J18\J18thmsimkup\Hooks;
/***************************************************************
 *  Copyright notice
 *
 *  (c) 2014 GLATZ, Josef <jousch@gmail.com>
 *  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 2 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\View\PageLayoutViewDrawItemHookInterface;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Extbase\Utility\DebuggerUtility;
use TYPO3\CMS\Backend\Utility\BackendUtility;
use TYPO3\CMS\Backend\Utility\IconUtility;
use \TYPO3\CMS\Core\Utility\ExtensionManagementUtility;


/**
 * Preprocesses the preview rendering of content elements.
 * - CType menu - menu_type galleryteaser
 * - CType menu - menu_type productselector
 *
 * @author GLATZ, Josef <jousch@gmail.com>
 * @package TYPO3
 * @subpackage tx_j18thmsimkup
 */
class PageLayoutViewDrawItem implements PageLayoutViewDrawItemHookInterface {

	/**
	 * Preprocesses the preview rendering of a content element.
	 *
	 * @param \TYPO3\CMS\Backend\View\PageLayoutView $parentObject Calling parent object
	 * @param boolean $drawItem Whether to draw the item using the default functionalities
	 * @param string $headerContent Header content
	 * @param string $itemContent Item content
	 * @param array $row Record row of tt_content
	 * @return void
	 */
	public function preProcess(\TYPO3\CMS\Backend\View\PageLayoutView &$parentObject, &$drawItem, &$headerContent, &$itemContent, array &$row) {
		if ($row['CType'] === 'menu' && $row['menu_type'] === 'galleryteaser') {
			$records = GeneralUtility::trimExplode(',', $row['pages']);
			$headerContent = '<strong>Gallery Teasers</strong><br>';
			$itemContent .= '<div style="display:block; padding:10px 0 20px 10px;">';

			foreach ($records as $key => $record) {
				$recordId = array_pop(GeneralUtility::trimExplode('_', $record));
				$childRecord = $GLOBALS['TYPO3_DB']->exec_SELECTgetSingleRow('*', 'pages', 'uid = ' . (int) $recordId);
				if ($childRecord['tx_s5singlegalleries_cover'] > 0) {
					$recordCover = $parentObject->thumbCode($childRecord, 'pages', 'tx_s5singlegalleries_cover');
				} else {
					$recordCover = '<div class="typo3-message message-warning" id="ext-gen55">
						<div class="message-body" id="ext-gen56"> Cover image is missing! </div></div>';
				}
				$recordEdit = $parentObject->getIcon('pages', $childRecord);
				$recordPath = BackendUtility::getRecordPath($childRecord['uid'], '', 20);
				if (ExtensionManagementUtility::isLoaded('pagepath', TRUE)) {
					$recordFrontendUrl = \tx_pagepath_api::getPagePath((int) $childRecord['uid']);
				}

				if ($key > 0) {
					$itemContent .= '<hr style="margin-top: 10px; margin-bottom: 10px;" />';
				}
				$itemContent .= '<div style="display:inline-block; margin-right: 10px;">' . $recordCover . '</div>' .
					'<div style="display:inline-block; vertical-align:top;"><b>' . $recordEdit . htmlspecialchars($childRecord['title']) . '</b>' . ($childRecord['nav_title'] ? ' (' . htmlspecialchars($childRecord['nav_title']) . ')' : '') . '<br>';
				$itemContent .= '<small><a href="' . $recordFrontendUrl . '" target="_blank" title="Opens gallery in new browser window/tab">' . $recordFrontendUrl . '</a></small><br>';
				$itemContent .= '<small style="color: #c2c2c2">' . $recordPath . '</small><br>';
				$itemContent .= '</div>';
			}

			$itemContent .= '</div>';
			$drawItem = FALSE;
		}

		if ($row['CType'] === 'menu' && $row['menu_type'] === 'websiteselector') {
			$records = GeneralUtility::trimExplode(',', $row['pages']);
			$headerContent = '<strong>Product/Website Selector</strong><br>';
			$itemContent .= '<div style="display:block; padding:10px 0 20px 10px;">';

			foreach ($records as $key => $record) {
				$recordId = array_pop(GeneralUtility::trimExplode('_', $record));
				$childRecord = $GLOBALS['TYPO3_DB']->exec_SELECTgetSingleRow('*', 'pages', 'uid = ' . (int) $recordId);
				if ($childRecord['media'] > 0) {
					$recordCover = $parentObject->thumbCode($childRecord, 'pages', 'media');
				} else {
					$recordCover = '<div class="typo3-message message-warning" id="ext-gen55">
						<div class="message-body" id="ext-gen56"> Image is missing! </div></div>';
				}
				if ($childRecord['tx_j18thmsimkup_productselecttitle']) {
					$recordTitle = htmlspecialchars($childRecord['tx_j18thmsimkup_productselecttitle']);
				} else {
					$recordTitle = '<div class="typo3-message message-warning" id="ext-gen55" style="display: inline-block">
						<div class="message-body" id="ext-gen56">Productselector Link Label for \'<span style="font-style: italic">' . htmlspecialchars($childRecord['title']) . '</span>\' is not set! </div></div>';
				}

				$recordEdit = $parentObject->getIcon('pages', $childRecord);
				if (ExtensionManagementUtility::isLoaded('pagepath', TRUE)) {
					$recordFrontendUrl = \tx_pagepath_api::getPagePath((int) $childRecord['uid']);
				}

				if ($key > 0) {
					$itemContent .= '<hr style="margin-top: 10px; margin-bottom: 10px;" />';
				}
				$itemContent .= '<div style="display:inline-block; margin-right: 10px;">' . $recordCover . '</div>' .
					'<div style="display:inline-block; vertical-align:top;"><b>' . $recordEdit . $recordTitle . '</b><br>';
				$itemContent .= '<small><a href="' . $recordFrontendUrl . '" target="_blank" title="Opens gallery in new browser window/tab">' . $recordFrontendUrl . '</a></small><br>';
				$itemContent .= '</div>';
			}

			$itemContent .= '</div>';
			$drawItem = FALSE;
		}
	}
}
?>

I would like to suggest to show an example of how you call the script in ext_localconf.php, too. Sources on the web show something like this:

[ext_localconf.php]

$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['cms/layout/class.tx_cms_layout.php']['tt_content_drawItem'][$_EXTKEY] = 
   \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::extPath($_EXTKEY).'Hooks/PageLayoutViewDrawItem.php:PageLayoutViewDrawItem';

However, I would like to know how you do it :-)

Thanks!
Robert

For sure, I call the script through [ext_localconf.php]

$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['cms/layout/class.tx_cms_layout.php']['tt_content_drawItem'][$_EXTKEY] =
    'EXT:' . $_EXTKEY . '/Classes/Hooks/PageLayoutViewDrawItem.php:J18\J18thmsimkup\Hooks\PageLayoutViewDrawItem';

I've updated to newer "syntax":

    $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['cms/layout/class.tx_cms_layout.php']['tt_content_drawItem'][$_EXTKEY] =
        'J18\\J18thmsimkup\\Hooks\\PageLayoutViewDrawItem';

In this scenario, the hook must implement an interface, therefore no method name must be given. (If I understand it correctly.)

Thanks, Jousch, for showing the possibilities and sharing!!!