FrontendHooks.php

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<?php
namespace TYPO3\CMS\Frontend\Hooks;

/*
 * 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 FrontendHooks
{
    public function hook_previewInfo($params, $pObj)
    {
        if ($pObj->fePreview !== 1) {
            return '';
        }
        if ($pObj->config['config']['message_preview']) {
            $message = $pObj->config['config']['message_preview'];
        } else {
            $styles = [];
            $styles[] = 'position: fixed';
            $styles[] = 'top: 15px';
            $styles[] = 'right: 15px';
            $styles[] = 'padding: 8px 18px';
            $styles[] = 'background: #fff3cd';
            $styles[] = 'border: 1px solid #ffeeba';
            $styles[] = 'font-family: sans-serif';
            $styles[] = 'font-size: 14px';
            $styles[] = 'font-weight: bold';
            $styles[] = 'color: #856404';
            $styles[] = 'z-index: 20000';
            $styles[] = 'user-select: none';
            $styles[] = 'pointer-events:none';
            $styles[] = 'text-align: center';
            $styles[] = 'border-radius: 2px';
            $message = '<div id="typo3-preview-info" style="' . implode(';', $styles) . '">PREVIEW</div>';
        }
        return $message;
    }
}