DefinitionList.php

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

class DefinitionList extends \TYPO3\CMS\Rtehtmlarea\RteHtmlAreaApi {

    protected $extensionKey = 'rtehtmlarea';

    // The key of the extension that is extending htmlArea RTE
    protected $pluginName = 'DefinitionList';

    // The name of the plugin registered by the extension
    protected $relativePathToLocallangFile = '';

    // Path to this main locallang file of the extension relative to the extension dir.
    protected $relativePathToSkin = 'extensions/DefinitionList/skin/htmlarea.css';

    // Path to the skin (css) file relative to the extension dir.
    protected $htmlAreaRTE;

    // Reference to the invoking object
    protected $thisConfig;

    // Reference to RTE PageTSConfig
    protected $toolbar;

    // Reference to RTE toolbar array
    protected $LOCAL_LANG;

    // Frontend language array
    protected $pluginButtons = 'definitionlist, definitionitem';

    protected $convertToolbarForHtmlAreaArray = array(
        'definitionlist' => 'DefinitionList',
        'definitionitem' => 'DefinitionItem'
    );

    // The comma-separated list of names of prerequisite plugins
    protected $requiredPlugins = 'BlockElements';

    public function main($parentObject) {
        $enabled = parent::main($parentObject) && $this->htmlAreaRTE->isPluginEnabled('BlockElements');
        if ($enabled && is_object($this->htmlAreaRTE->registeredPlugins['BlockElements'])) {
            $this->htmlAreaRTE->registeredPlugins['BlockElements']->setSynchronousLoad();
        }
        return $enabled;
    }

    public function buildJavascriptConfiguration($RTEcounter) {
        global $TSFE, $LANG;
        $registerRTEinJavascriptString = '';
        return $registerRTEinJavascriptString;
    }

    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;
        }
    }

}