DialogRenderer::renderResponse

public DialogRenderer::renderResponse(array $main_content, Request $request, RouteMatchInterface $route_match)

public function renderResponse(array $main_content, Request $request, RouteMatchInterface $route_match) {
  $response = new AjaxResponse();

  // First render the main content, because it might provide a title.
  $content = drupal_render_root($main_content);

  // Attach the library necessary for using the OpenDialogCommand and set the
  // attachments for this Ajax response.
  $main_content['#attached']['library'][] = 'core/drupal.dialog.ajax';
  $response->setAttachments($main_content['#attached']);

  // Determine the title: use the title provided by the main content if any,
  // otherwise get it from the routing information.
  $title = isset($main_content['#title']) ? $main_content['#title'] : $this->titleResolver->getTitle($request, $route_match->getRouteObject());

  // Determine the dialog options and the target for the OpenDialogCommand.
  $options = $request->request->get('dialogOptions', array());
  $target = $this->determineTargetSelector($options, $route_match);

  $response->addCommand(new OpenDialogCommand($target, $title, $content, $options));
  return $response;
}