ExtJsArrayTreeRenderer.php

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<?php
namespace TYPO3\CMS\Core\Tree\TableConfiguration;

/*
 * 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 ExtJsArrayTreeRenderer extends \TYPO3\CMS\Backend\Tree\Renderer\ExtJsJsonTreeRenderer
{
    protected function getNodeArray(\TYPO3\CMS\Backend\Tree\TreeRepresentationNode $node)
    {
        $nodeArray = parent::getNodeArray($node);
        $nodeArray = array_merge($nodeArray, [
            'expanded' => $node->getExpanded(),
            'expandable' => $node->hasChildNodes(),
            'checked' => $node->getSelected()
        ]);
        if (!$node->getSelectable()) {
            unset($nodeArray['checked']);
        }
        return $nodeArray;
    }

    public function renderTree(\TYPO3\CMS\Backend\Tree\AbstractTree $tree, $recursive = true)
    {
        $this->recursionLevel = 0;
        $children = $this->renderNode($tree->getRoot(), $recursive);
        return $children;
    }
}