CheckboxElementView.php

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<?php
namespace TYPO3\CMS\Form\View\Mail\Plain\Element;

class CheckboxElementView extends \TYPO3\CMS\Form\View\Mail\Plain\Element\AbstractElementView {

    public function __construct(\TYPO3\CMS\Form\Domain\Model\Element\CheckboxElement $model, $spaces) {
        parent::__construct($model, $spaces);
    }

    public function render() {
        $content = $this->getValue();
        if (empty($content) === FALSE) {
            $content = str_repeat(chr(32), $this->spaces) . $content;
        }
        return $content;
    }

    protected function getValue() {
        $value = NULL;
        if (array_key_exists('checked', $this->model->getAllowedAttributes()) && $this->model->hasAttribute('checked')) {
            if ($this->model->additionalIsSet('label')) {
                $value = $this->model->getAdditionalValue('label');
            } else {
                $value = $this->model->getAttributeValue('value');
                if ($value === '') {
                    $value = $this->model->getAttributeValue('name');
                }
            }
        }
        return $value;
    }

}