HelpButton.php

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

/*
 * 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!
 */

use TYPO3\CMS\Backend\Utility\BackendUtility;
use TYPO3\CMS\Backend\Template\Components\ButtonBar;
use TYPO3\CMS\Backend\Template\Components\Buttons\ButtonInterface;
use TYPO3\CMS\Backend\Template\Components\Buttons\PositionInterface;

class HelpButton implements ButtonInterface, PositionInterface
{
    protected $moduleName;

    protected $fieldName = '';

    public function getModuleName()
    {
        return $this->moduleName;
    }

    public function setModuleName($moduleName)
    {
        $this->moduleName = $moduleName;
        return $this;
    }

    public function getFieldName()
    {
        return $this->fieldName;
    }

    public function setFieldName($fieldName)
    {
        $this->fieldName = $fieldName;
        return $this;
    }

    public function getPosition()
    {
        return ButtonBar::BUTTON_POSITION_RIGHT;
    }

    public function getGroup()
    {
        return 99;
    }

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

    public function isValid()
    {
        return (!empty($this->moduleName));
    }

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

    public function render()
    {
        $helpMarkup = BackendUtility::cshItem($this->moduleName, $this->fieldName);
        if ($helpMarkup === '') {
            return '';
        }
        return '<span class="btn btn-sm btn-default">' . $helpMarkup . '</span>';
    }
}