[TASK] Add a message to show when a news got no category

Classes/Backend/CategoryWarningDrawer.php

+<?php
+/*
+ * Copyright notice
+ *
+ * (c) sgalinski Internet Services (https://www.sgalinski.de)
+ *
+ * All rights reserved
+ *
+ * This script is part of the TYPO3 project. The TYPO3 project is
+ * free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * The GNU General Public License can be found at
+ * http://www.gnu.org/copyleft/gpl.html.
+ *
+ * This script is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * This copyright notice MUST APPEAR in all copies of the script!
+ */
+
+namespace SGalinski\SgNews\Backend;
+
+use SGalinski\SgNews\Domain\Model\Category;
+use TYPO3\CMS\Backend\Controller\PageLayoutController;
+use TYPO3\CMS\Core\Database\Connection;
+use TYPO3\CMS\Core\Database\ConnectionPool;
+use TYPO3\CMS\Core\Localization\LanguageService;
+use TYPO3\CMS\Core\Messaging\FlashMessage;
+use TYPO3\CMS\Core\Messaging\FlashMessageRendererResolver;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+
+/**
+ *
+ */
+class CategoryWarningDrawer {
+
+	/**
+	 * @var LanguageService
+	 */
+	protected $languageService;
+
+	public function __construct(LanguageService $languageService) {
+		$this->languageService = $languageService;
+	}
+
+	/**
+	 * @param array|NULL $params
+	 * @param PageLayoutController|NULL $parentObj
+	 * @return string
+	 * @throws \Doctrine\DBAL\Driver\Exception
+	 */
+	public function render(array $params = null, PageLayoutController $parentObj = null): string {
+		$parentPage = $parentObj->pageinfo['pid'];
+		$queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)
+			->getQueryBuilderForTable('pages');
+		$parentDoktype = $queryBuilder->select('doktype')
+			->from('pages')
+			->where(
+				$queryBuilder->expr()->eq(
+					'uid',
+					$queryBuilder->createNamedParameter($parentPage, Connection::PARAM_INT)
+				)
+			)->execute()
+			->fetchOne();
+		if ($parentDoktype === Category::DOK_TYPE_CATEGORY) {
+			return '';
+		}
+
+		$message = GeneralUtility::makeInstance(FlashMessage::class,
+		   $this->languageService->sL(
+			   'LLL:EXT:sg_news/Resources/Private/Language/locallang_backend.xlf:categoryErrorMessage'
+		   ),
+			$this->languageService->sL(
+				'LLL:EXT:sg_news/Resources/Private/Language/locallang_backend.xlf:categoryErrorMessageHeader'
+			),
+		   FlashMessage::ERROR,
+		   true
+		);
+		return GeneralUtility::makeInstance(FlashMessageRendererResolver::class)
+		   ->resolve()
+		   ->render([$message]);
+	}
+}

Resources/Private/Language/de.locallang_backend.xlf

@@ -93,6 +93,14 @@
 				<source><![CDATA[News Single View]]></source>
 				<target><![CDATA[News Einzelansicht]]></target>
 			</trans-unit>
+			<trans-unit id="categoryErrorMessageHeader">
+				<source><![CDATA[No category found]]></source>
+				<target><![CDATA[Keine Kategorie gefunden]]></target>
+			</trans-unit>
+			<trans-unit id="categoryErrorMessage">
+				<source><![CDATA[This news has no category. Please put it into a category or the rendering will be errorneous. The category most not be hidden, either.]]></source>
+				<target><![CDATA[Dieser Beitrag ist keiner Kategorie zugewiesen. Bitte verschieben Sie ihn in eine Kategorie, damit die Darstellung korrekt funktioniert. Die Kategorie darf nicht versteckt sein.]]></target>
+			</trans-unit>
 		</body>
 	</file>
-</xliff>
\ No newline at end of file
+</xliff>

Resources/Private/Language/locallang_backend.xlf

@@ -78,6 +78,12 @@
 			<trans-unit id="titleSingleViewPlugin">
 				<source><![CDATA[News Single View]]></source>
 			</trans-unit>
+			<trans-unit id="categoryErrorMessageHeader">
+				<source><![CDATA[No category found]]></source>
+			</trans-unit>
+			<trans-unit id="categoryErrorMessage">
+				<source><![CDATA[This news has no category. Please put it into a category or the rendering will be errorneous. The category most not be hidden, either.]]></source>
+			</trans-unit>
 		</body>
 	</file>
-</xliff>
\ No newline at end of file
+</xliff>

ext_localconf.php

@@ -97,6 +97,8 @@ call_user_func(
 			\SGalinski\SgNews\TCA\TcaProvider::class;
 		$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['cms/layout/class.tx_cms_layout.php']['tt_content_drawItem']['sg_news']
 			= \SGalinski\SgNews\Hooks\PageLayoutView\PluginRenderer::class;
+		$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['cms/layout/db_layout.php']['drawHeaderHook'][]
+		    = \SGalinski\SgNews\Backend\CategoryWarningDrawer::class . '->render';
 
 		// Xclasses
 		$GLOBALS['TYPO3_CONF_VARS']['SYS']['Objects'][\TYPO3\CMS\Core\Page\PageRenderer::class] =

[Stefan Galinski]

PhpDoc fehlt

[Stefan Galinski]

Hier muss beschrieben werden, was die überhaupt macht.

[Stefan Galinski]

Das kommt doch jetzt auf jeder Seite als Fehler. Inwiefern werden hier nur News geprüft?

[Stefan Galinski]

An Matthias übergeben zwecks Test, ob das in TYPO3 11 überhaupt noch geht.