IconViewHelper.php

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<?php
namespace TYPO3\CMS\Reports\ViewHelpers;

/*
 * 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\Core\Utility\ExtensionManagementUtility;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Core\Utility\PathUtility;
use TYPO3\CMS\Fluid\ViewHelpers\Be\AbstractBackendViewHelper;
use TYPO3Fluid\Fluid\Core\Rendering\RenderingContextInterface;

class IconViewHelper extends AbstractBackendViewHelper
{
    protected $escapeOutput = false;

    public function initializeArguments()
    {
        parent::initializeArguments();
        $this->registerArgument('icon', 'string', 'Icon to be used', true);
        $this->registerArgument('title', 'string', 'Optional title', false, '');
    }

    public function render()
    {
        return static::renderStatic(
            $this->arguments,
            $this->buildRenderChildrenClosure(),
            $this->renderingContext
        );
    }

    public static function renderStatic(array $arguments, \Closure $renderChildrenClosure, RenderingContextInterface $renderingContext)
    {
        $icon = $arguments['icon'];
        $title = $arguments['title'];

        $icon = GeneralUtility::getFileAbsFileName($icon);

        // use the extension icon from EXT:reports as fallback
        if (!$icon) {
            $fallbackIconPath = ExtensionManagementUtility::extPath('reports');
            $icon = ExtensionManagementUtility::getExtensionIcon($fallbackIconPath, true);
        }

        return '<img src="' . htmlspecialchars(PathUtility::getAbsoluteWebPath($icon))
               . '" width="16" height="16" title="' . htmlspecialchars($title)
               . '" alt="' . htmlspecialchars($title) . '" />';
    }
}