FullyRenderedButton.php

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<?php
namespace TYPO3\CMS\Backend\Template\Components\Buttons;

/*
 * 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 FullyRenderedButton implements ButtonInterface
{
    protected $htmlSource = '';

    public function getHtmlSource()
    {
        return $this->htmlSource;
    }

    public function setHtmlSource($htmlSource)
    {
        $this->htmlSource = $htmlSource;
        return $this;
    }

    public function getType()
    {
        return get_class($this);
    }

    public function isValid()
    {
        if (
            trim($this->getHtmlSource()) !== ''
            && $this->getType() === FullyRenderedButton::class
        ) {
            return true;
        }
        return false;
    }

    public function __toString()
    {
        return $this->render();
    }

    public function render()
    {
        return '<span class="btn btn-sm btn-default">' . $this->getHtmlSource() . '</span>';
    }
}