wxt-8.x-3.011/modules/custom/wxt_ext/wxt_ext_media/src/Form/EntityEmbedDialog.php

<?php

namespace Drupal\wxt_ext_media\Form;

use Drupal\Core\Form\FormStateInterface;
use Drupal\entity_embed\Form\EntityEmbedDialog as BaseEntityEmbedDialog;
use Drupal\media\MediaInterface;

/**
 * Overrides the entity embed dialog with specialized logic.
 *
 * Leveraged from code provided by Acquia for the Lightning distribution.
 */
class EntityEmbedDialog extends BaseEntityEmbedDialog {

  /**
   * {@inheritdoc}
   */
  public function buildEmbedStep(array $form, FormStateInterface $form_state) {
    $entity = $form_state->get('entity');
    $element = $form_state->get('entity_element');
    $input = $form_state->getUserInput();

    // If we're working with an existing embed, $input['editor_object'] will be
    // set, in which case we don't want to change anything (see ::buildForm()).
    // Otherwise, if the entity being embedded is a media item, see if its type
    // plugin has a preference regarding which display plugin to use.
    if (empty($input['editor_object']) && $entity instanceof MediaInterface) {
      $plugin_definition = $entity->getSource()->getPluginDefinition();

      if (isset($plugin_definition['entity_embed_display'])) {
        $element['data-entity-embed-display'] = $plugin_definition['entity_embed_display'];
        $form_state->set('entity_element', $element);
      }
    }

    $form = parent::buildEmbedStep($form, $form_state);

    // If the user can choose the display plugin, allow WxT Extend Media's
    // settings to override that access.
    $element = &$form['attributes']['data-entity-embed-display'];
    if ($element['#access']) {
      $element['#access'] = $this->config('wxt_ext_media.settings')->get('entity_embed.choose_display');
    }
    return $form;
  }

}