BackendUtilityHook.php

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

class BackendUtilityHook implements \TYPO3\CMS\Core\SingletonInterface {

    static public function getInstance() {
        return \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(__CLASS__);
    }

    public function preProcess(&$pageUid, $backPath, $rootLine, $anchorSection, &$viewScript, $additionalGetVars, $switchFocus) {
        if ($GLOBALS['BE_USER']->workspace !== 0) {
            $viewScript = $this->getWorkspaceService()->generateWorkspaceSplittedPreviewLink($pageUid);
        }
    }

    protected function getWorkspaceService() {
        return \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Workspaces\\Service\\WorkspaceService');
    }

    public function makeEditForm_accessCheck($params, &$form) {
        if ($GLOBALS['BE_USER']->workspace !== 0 && $GLOBALS['TCA'][$params['table']]['ctrl']['versioningWS']) {
            $record = \TYPO3\CMS\Backend\Utility\BackendUtility::getRecordWSOL($params['table'], $params['uid']);
            if (abs($record['t3ver_stage']) > \TYPO3\CMS\Workspaces\Service\StagesService::STAGE_EDIT_ID) {
                $stages = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Workspaces\\Service\\StagesService');
                $stageName = $stages->getStageTitle($record['t3ver_stage']);
                $editingName = $stages->getStageTitle(\TYPO3\CMS\Workspaces\Service\StagesService::STAGE_EDIT_ID);
                $message = $GLOBALS['LANG']->sL('LLL:EXT:workspaces/Resources/Private/Language/locallang.xlf:info.elementAlreadyModified');
                $flashMessage = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Messaging\\FlashMessage', sprintf($message, $stageName, $editingName), '', \TYPO3\CMS\Core\Messaging\FlashMessage::INFO, TRUE);
                $flashMessageService = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Messaging\\FlashMessageService');
                $defaultFlashMessageQueue = $flashMessageService->getMessageQueueByIdentifier();
                $defaultFlashMessageQueue->enqueue($flashMessage);
            }
        }
        return $params['hasAccess'];
    }

}