Issue #3351331 by solene_ggd, mxh: Support for Contextual links

src/Entity/Storage.php

@@ -24,7 +24,7 @@ use Drupal\user\UserInterface;
  *   bundle_label = @Translation("Storage type"),
  *   handlers = {
  *     "storage" = "Drupal\storage\StorageStorage",
- *     "view_builder" = "Drupal\Core\Entity\EntityViewBuilder",
+ *     "view_builder" = "Drupal\storage\StorageViewBuilder",
  *     "list_builder" = "Drupal\storage\StorageListBuilder",
  *     "views_data" = "Drupal\storage\Entity\StorageViewsData",
  *     "translation" = "Drupal\storage\StorageTranslationHandler",

src/StorageViewBuilder.php

+<?php
+
+namespace Drupal\storage;
+
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Entity\EntityViewBuilder;
+use Drupal\Core\Entity\Display\EntityViewDisplayInterface;
+use Drupal\storage\Entity\StorageInterface;
+
+/**
+ * View builder handler for storage entities.
+ */
+class StorageViewBuilder extends EntityViewBuilder {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function addContextualLinks(array &$build, EntityInterface $entity) {
+    if ($entity->isNew() || !($entity instanceof StorageInterface)) {
+      return;
+    }
+    $key = $entity->getEntityTypeId();
+    $rel = 'canonical';
+    if (!$entity->isDefaultRevision()) {
+      $rel = 'revision';
+      $key .= '_revision';
+    }
+
+    $build['#contextual_links'][$key] = [
+      'route_parameters' => [$key => $entity->id()],
+      'metadata' => ['changed' => $entity->getChangedTime()],
+    ];
+    if ($entity->hasLinkTemplate($rel) && $entity->toUrl($rel)->isRouted()) {
+      $build['#contextual_links'][$key]['route_parameters'] = $entity->toUrl($rel)->getRouteParameters();
+    }
+  }
+
+}

storage.links.contextual.yml

+entity.storage.edit_form:
+  route_name: entity.storage.edit_form
+  group: storage
+  title: Edit
+
+entity.storage.delete_form:
+  route_name: entity.storage.delete_form
+  group: storage
+  title: Delete
+  weight: 10

templates/storage.html.twig

@@ -9,6 +9,7 @@
  * Available variables:
  * - content: A list of content items. Use 'content' to print all content, or
  * - attributes: HTML attributes for the container element.
+ * - title_suffix: Additional output populated by modules.
  *
  * @see template_preprocess_storage()
  *
@@ -16,6 +17,7 @@
  */
 #}
 <div{{ attributes.addClass('storage') }}>
+  {{ title_suffix }}
   {% if content %}
     {{- content -}}
   {% endif %}