ExtJsArrayTreeRenderer.php

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

class ExtJsArrayTreeRenderer extends \TYPO3\CMS\Backend\Tree\Renderer\ExtJsJsonTreeRenderer {

    protected function getNodeArray(\TYPO3\CMS\Core\Tree\TableConfiguration\DatabaseTreeNode $node) {
        $nodeArray = parent::getNodeArray($node);
        $nodeArray = array_merge($nodeArray, array(
            '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;
    }

}