PagetreeCollectionsProcessor.php

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<?php
namespace TYPO3\CMS\Workspaces\ExtDirect;

use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Workspaces\Service\WorkspaceService;

class PagetreeCollectionsProcessor implements \TYPO3\CMS\Backend\Tree\Pagetree\CollectionProcessorInterface {

    protected $workspaceService = NULL;

    public function postProcessGetNodes($node, $mountPoint, $level, $nodeCollection) {
        foreach ($nodeCollection as $node) {
            $this->highlightVersionizedElements($node);
        }
    }

    public function postProcessFilteredNodes($node, $searchFilter, $mountPoint, $nodeCollection) {
        foreach ($nodeCollection as $node) {
            $this->highlightVersionizedElements($node);
        }
    }

    public function postProcessGetTreeMounts($searchFilter, $nodeCollection) {
        foreach ($nodeCollection as $node) {
            $this->highlightVersionizedElements($node);
        }
    }

    protected function highlightVersionizedElements(\TYPO3\CMS\Backend\Tree\TreeNode $node) {
        if (!$node->getCls() && $this->getWorkspaceService()->hasPageRecordVersions($GLOBALS['BE_USER']->workspace, $node->getId())) {
            $node->setCls('ver-versions');
        }
    }

    protected function getWorkspaceService() {
        if ($this->workspaceService === NULL) {
            $this->workspaceService = GeneralUtility::makeInstance('TYPO3\\CMS\\Workspaces\\Service\\WorkspaceService');
        }

        return $this->workspaceService;
    }

}