Issue #2648888 by jfrederick: Allow media entity to be modified befor…

…e saving

modules/eb_widget/src/Plugin/EntityBrowser/Widget/MediaEntityDropzoneJsEbWidget.php

@@ -13,6 +13,8 @@
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Session\AccountProxyInterface;
 use Drupal\dropzonejs\DropzoneJsUploadSaveInterface;
+use Drupal\dropzonejs\Events\DropzoneMediaEntityCreateEvent;
+use Drupal\dropzonejs\Events\Events;
 use Drupal\entity_browser\WidgetBase;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
@@ -117,6 +119,9 @@ public function submit(array &$element, array &$form, FormStateInterface $form_s
               'status' => TRUE,
               'type' => $bundle->getType()->getPluginId(),
             ]);
+            $event = $this->eventDispatcher->dispatch(Events::MEDIA_ENTITY_CREATE, new DropzoneMediaEntityCreateEvent($media_entity, $file, $form, $form_state, $element));
+            $media_entity = $event->getMediaEntity();
+
             $media_entity->save();
             $media_entities[] = $media_entity;
           }

src/Events/DropzoneMediaEntityCreateEvent.php

@@ -0,0 +1,152 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\dropzonejs\Events\DropzoneMediaEntityCreateEvent.
+ */
+
+namespace Drupal\dropzonejs\Events;
+
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\file\FileInterface;
+use Drupal\media_entity\MediaInterface;
+use Symfony\Component\EventDispatcher\Event;
+
+/**
+ * Represents Media Entity creation as an event when using DropzoneJS.
+ */
+class DropzoneMediaEntityCreateEvent extends Event {
+
+  /**
+   * The media entity being created.
+   *
+   * @var \Drupal\media_entity\MediaInterface
+   */
+  protected $mediaEntity;
+
+  /**
+   * The file that will be used for the media entity.
+   *
+   * @var \Drupal\file\FileInterface
+   */
+  protected $file;
+
+  /**
+   * The form that contains the Dropzone element.
+   *
+   * @var array
+   */
+  protected $form;
+
+  /**
+   * The form state.
+   *
+   * @var \Drupal\Core\Form\FormStateInterface
+   */
+  protected $formState;
+
+  /**
+   * The Dropzone form element.
+   *
+   * @var array
+   */
+  protected $element;
+
+  /**
+   * DropzoneMediaEntityCreateEvent constructor.
+   *
+   * @param \Drupal\media_entity\MediaInterface $media_entity
+   *   The media entity being created.
+   * @param \Drupal\file\FileInterface $file
+   *   The file that will be used for the media entity.
+   * @param $form
+   *   The form that contains the Dropzone element.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The form state.
+   * @param $element
+   *   The Dropzone form element.
+   */
+  public function __construct(MediaInterface $media_entity, FileInterface $file, $form, FormStateInterface $form_state, $element) {
+    $this->mediaEntity = $media_entity;
+    $this->file = $file;
+    $this->form = $form;
+    $this->formState = $form_state;
+    $this->element = $element;
+  }
+
+  /**
+   * Get the media entity.
+   *
+   * @return \Drupal\media_entity\MediaInterface
+   */
+  public function getMediaEntity() {
+    return $this->mediaEntity;
+  }
+
+  /**
+   * Set the media entity.
+   *
+   * @param \Drupal\media_entity\MediaInterface $media_entity
+   *   The updated media entity.
+   */
+  public function setMediaEntity(MediaInterface $media_entity) {
+    $this->mediaEntity = $media_entity;
+  }
+
+  /**
+   * Get the file for the media entity.
+   *
+   * @return \Drupal\file\FileInterface
+   */
+  public function getFile() {
+    return $this->file;
+  }
+
+  /**
+   * Get the form that contains the Dropzone element.
+   *
+   * @return array
+   */
+  public function getForm() {
+    return $this->form;
+  }
+
+  /**
+   * Get the form state.
+   *
+   * @return \Drupal\Core\Form\FormStateInterface
+   */
+  public function getFormState() {
+    return $this->formState;
+  }
+
+  /**
+   * Set the form state.
+   *
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The updated form state.
+   */
+  public function setFormState(FormStateInterface $form_state) {
+    $this->formState = $form_state;
+  }
+
+  /**
+   * Get the Dropzone form element.
+   *
+   * @return array
+   */
+  public function getElement() {
+    return $this->element;
+  }
+
+  /**
+   * Set the Dropzone form element.
+   *
+   * @param $element
+   *   The updated form element.
+   */
+  public function setElement($element) {
+    $this->element = $element;
+  }
+
+}

src/Events/Events.php

@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\dropzonejs\Events\Events.
+ */
+
+namespace Drupal\dropzonejs\Events;
+
+/**
+ * Contains all events thrown by dropzonejs.
+ */
+final class Events {
+
+  /**
+   * The MEDIA_ENTITY_CREATE event occurs when creating a new Media Entity,
+   * before it is saved to the database.
+   *
+   * @var string
+   */
+  const MEDIA_ENTITY_CREATE = 'dropzonejs.media_entity_create';
+
+}