Issue #973 Add hooks to IIIF manifest Views Style plugin.

modules/islandora_iiif/src/Plugin/views/style/IIIFManifest.php

@@ -4,6 +4,7 @@ namespace Drupal\islandora_iiif\Plugin\views\style;
 
 use Drupal\views\Plugin\views\style\StylePluginBase;
 use Drupal\Core\Entity\EntityTypeManagerInterface;
+use \Drupal\Core\Extension\ModuleHandlerInterface;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Messenger\MessengerInterface;
 use Drupal\Core\Url;
@@ -91,10 +92,15 @@ class IIIFManifest extends StylePluginBase {
    */
   protected $messenger;
   
+  /**
+   * @var \Drupal\Core\Extention\ModuleHandlerInterface;
+   */
+  protected $moduleHandler;
+
   /**
    * {@inheritdoc}
    */
-  public function __construct(array $configuration, $plugin_id, $plugin_definition, SerializerInterface $serializer, Request $request, ImmutableConfig $iiif_config, EntityTypeManagerInterface $entity_type_manager, FileSystemInterface $file_system, Client $http_client, MessengerInterface $messenger) {
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, SerializerInterface $serializer, Request $request, ImmutableConfig $iiif_config, EntityTypeManagerInterface $entity_type_manager, FileSystemInterface $file_system, Client $http_client, MessengerInterface $messenger, ModuleHandlerInterface $moduleHandler) {
     parent::__construct($configuration, $plugin_id, $plugin_definition);
 
     $this->serializer = $serializer;
@@ -104,6 +110,7 @@ class IIIFManifest extends StylePluginBase {
     $this->fileSystem = $file_system;
     $this->httpClient = $http_client;
     $this->messenger = $messenger;
+    $this->moduleHandler = $moduleHandler;
   }
 
   /**
@@ -120,10 +127,21 @@ class IIIFManifest extends StylePluginBase {
       $container->get('entity_type.manager'),
       $container->get('file_system'),
       $container->get('http_client'),
-      $container->get('messenger')
+      $container->get('messenger'),
+      $container->get('module_handler')
     );
   }
 
+  /**
+   * Return the request property.
+   * 
+   * @return \Symfony\Component\HttpFoundation\Request
+   *   The Symfony request object
+   */
+  public function getRequest() {
+    return $this->request;
+  }
+
   /**
    * {@inheritdoc}
    */
@@ -170,6 +188,9 @@ class IIIFManifest extends StylePluginBase {
 
     $content_type = 'json';
 
+    // Give other modules a chance to alter the manifest.
+    $this->moduleHandler->alter('islandora_iiif_manifest', $json, $this);
+
     return $this->serializer->serialize($json, $content_type, ['views_style_plugin' => $this]);
   }
 
@@ -288,6 +309,10 @@ class IIIFManifest extends StylePluginBase {
             ];
           }
 
+          // Give other modules a chance to alter the canvas
+          $alter_options = ['options' => $this->options, 'views_plugin' => $this];
+          $this->moduleHandler->alter('islandora_iiif_manifest_canvas', $tmp_canvas, $row, $alter_options);
+
           $canvases[] = $tmp_canvas;
         }
       }