ButtonElement.php

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<?php
namespace TYPO3\CMS\Form\Domain\Model\Element;

class ButtonElement extends \TYPO3\CMS\Form\Domain\Model\Element\AbstractElement {

    protected $allowedAttributes = array(
        'accesskey' => '',
        'alt' => '',
        'class' => '',
        'dir' => '',
        'disabled' => '',
        'id' => '',
        'lang' => '',
        'name' => '',
        'style' => '',
        'tabindex' => '',
        'title' => '',
        'type' => 'button',
        'value' => ''
    );

    protected $mandatoryAttributes = array(
        'name',
        'id'
    );

    public function setValue($value = '') {
        $localizationHandler = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Form\\Localization');
        $oldValue = $this->getAttributeValue('value');
        if (empty($oldValue)) {
            if (!empty($value)) {
                $newValue = (string) $value;
            } else {
                $newValue = $localizationHandler->getLocalLanguageLabel('tx_form_domain_model_element_button.value');
            }
            $this->value = (string) $newValue;
            $this->setAttribute('value', $newValue);
        }
    }

}