TranslateLabelSelectViewHelper.php

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<?php
namespace TYPO3\CMS\Belog\ViewHelpers\Form;

/*
 * 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!
 */

class TranslateLabelSelectViewHelper extends \TYPO3\CMS\Fluid\ViewHelpers\Form\SelectViewHelper
{
    public function initializeArguments()
    {
        parent::initializeArguments();
        $this->registerArgument('optionLabelPrefix', 'string', 'Prefix for locallang lookup');
    }

    protected function getOptions()
    {
        $options = parent::getOptions();
        foreach ($options as $value => $label) {
            $options[$value] = $this->translateLabel($label);
        }
        return $options;
    }

    protected function translateLabel($label)
    {
        if ($label === '') {
            return '';
        }
        $labelKey = $this->hasArgument('optionLabelPrefix') ? $this->arguments['optionLabelPrefix'] . $label : $label;
        $translatedLabel = \TYPO3\CMS\Extbase\Utility\LocalizationUtility::translate($labelKey, $this->renderingContext->getControllerContext()->getRequest()->getControllerExtensionName());
        return $translatedLabel ?: $label;
    }
}