DefinitionList.php

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<?php
namespace TYPO3\CMS\Rtehtmlarea\Extension;

/*
 * 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\Rtehtmlarea\RteHtmlAreaApi;

class DefinitionList extends RteHtmlAreaApi
{
    protected $pluginName = 'DefinitionList';

    protected $pluginButtons = 'definitionlist, definitionitem';

    protected $convertToolbarForHtmlAreaArray = [
        'definitionlist' => 'DefinitionList',
        'definitionitem' => 'DefinitionItem'
    ];

    protected $requiredPlugins = 'BlockElements';

    public function main(array $configuration)
    {
        return parent::main($configuration)
            && isset($GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['rtehtmlarea']['plugins']['BlockElements']);
    }

    public function buildJavascriptConfiguration()
    {
        return '';
    }

    public function applyToolbarConstraints($show)
    {
        $blockElementsButtons = 'formatblock, indent, outdent, blockquote, insertparagraphbefore, insertparagraphafter, left, center, right, justifyfull, orderedlist, unorderedlist';
        $notRemoved = array_intersect(\TYPO3\CMS\Core\Utility\GeneralUtility::trimExplode(',', $blockElementsButtons, true), $show);
        // DefinitionList plugin requires BlockElements plugin
        // We will not allow any definition lists operations if all block elements buttons were disabled
        if (empty($notRemoved)) {
            return array_diff($show, \TYPO3\CMS\Core\Utility\GeneralUtility::trimExplode(',', $this->pluginButtons));
        } else {
            return $show;
        }
    }
}