[WIP] backend template

Classes/Listener/PageContentPreviewRendering.php

@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+namespace B13\Container\Listener;
+
+/*
+ * This file is part of TYPO3 CMS-based extension "container" by b13.
+ *
+ * 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.
+ */
+
+use B13\Container\Backend\Preview\GridRenderer;
+use B13\Container\Tca\Registry;
+use TYPO3\CMS\Backend\View\Event\PageContentPreviewRenderingEvent;
+
+class PageContentPreviewRendering
+{
+    protected GridRenderer $gridRenderer;
+    protected Registry $tcaRegistry;
+
+    public function __construct(GridRenderer $gridRenderer, Registry $tcaRegistry)
+    {
+        $this->gridRenderer = $gridRenderer;
+        $this->tcaRegistry = $tcaRegistry;
+    }
+
+    public function __invoke(PageContentPreviewRenderingEvent $event): void
+    {
+        $record = $event->getRecord();
+        if (!$this->tcaRegistry->isContainerElement($record['CType'])) {
+            return;
+        }
+        $record['tx_container_grid'] = $this->gridRenderer->renderGrid($record, $event->getPageLayoutContext());
+        $event->setRecord($record);
+    }
+}

Classes/Tca/Registry.php

@@ -66,7 +66,9 @@ public function configureContainer(ContainerConfiguration $containerConfiguratio
             );
         }
 
-        $GLOBALS['TCA']['tt_content']['types'][$containerConfiguration->getCType()]['previewRenderer'] = \B13\Container\Backend\Preview\ContainerPreviewRenderer::class;
+        if ($containerConfiguration->getBackendTemplate() === null || (GeneralUtility::makeInstance(Typo3Version::class))->getMajorVersion() === 11) {
+            $GLOBALS['TCA']['tt_content']['types'][$containerConfiguration->getCType()]['previewRenderer'] = \B13\Container\Backend\Preview\ContainerPreviewRenderer::class;
+        }
 
         if ((GeneralUtility::makeInstance(Typo3Version::class))->getMajorVersion() >= 13) {
             if (!isset($GLOBALS['TCA']['tt_content']['types'][$containerConfiguration->getCType()]['creationOptions'])) {

Configuration/Services.yaml

@@ -68,6 +68,11 @@ services:
     tags:
       - name: event.listener
         identifier: 'tx-container-boot-completed'
+  B13\Container\Listener\PageContentPreviewRendering:
+    tags:
+      - name: event.listener
+        identifier: 'tx-container-page-content-preview-rendering'
+        before: 'typo3-backend/fluid-preview/content'
   B13\Container\Command\FixLanguageModeCommand:
     tags:
       - name: 'console.command'