CheckboxGroupElementView.php

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

class CheckboxGroupElementView extends \TYPO3\CMS\Form\View\Mail\Plain\Element\ContainerElementView {

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

    public function render() {
        $content = '';
        if ($this->model->additionalIsSet('legend')) {
            $content = $this->model->getAdditionalValue('legend') . ': ' . chr(10);
        }
        $content .= $this->renderChildren($this->model->getElements(), $this->spaces + 4);
        return str_repeat(chr(32), $this->spaces) . $content;
    }

}