init

app/code/Esun/CmsLayout/Observer/ApplyCustomFullWidthLayout.php

@@ -0,0 +1,31 @@
+<?php
+declare(strict_types=1);
+
+namespace Esun\CmsLayout\Observer;
+
+use Magento\Framework\Event\Observer;
+use Magento\Framework\Event\ObserverInterface;
+use Magento\Framework\View\Page\Config as PageConfig;
+
+class ApplyCustomFullWidthLayout implements ObserverInterface
+{
+    private const PAGE_LAYOUT = 'cms-custom-full-width';
+
+    public function __construct(
+        private readonly PageConfig $pageConfig
+    ) {
+    }
+
+    public function execute(Observer $observer): void
+    {
+        if ($observer->getEvent()->getFullActionName() !== 'cms_page_view'
+            || $this->pageConfig->getPageLayout() !== self::PAGE_LAYOUT
+        ) {
+            return;
+        }
+
+        $this->pageConfig->addBodyClass('cms-custom-full-width');
+        $this->pageConfig->addPageAsset('Magento_Theme::css/cms-custom-common.css');
+        $observer->getEvent()->getLayout()->unsetElement('breadcrumbs');
+    }
+}