class DefaultDisplay

class DefaultDisplay extends DisplayPluginBase {
    
    /**
     * Whether the display allows attachments.
     *
     * @var bool
     */
    protected $usesAttachments = TRUE;
    
    /**
     * Determine if this display is the default which contains fallback settings.
     */
    public function isDefaultDisplay() {
        return TRUE;
    }
    
    /**
     * The default execute handler fully renders the view.
     *
     * For the simplest use:
     * @code
     *   $output = $view->executeDisplay('default', $args);
     * @endcode
     *
     * For more complex usages, a view can be partially built:
     * @code
     *   $view->setArguments($args);
     *   $view->build('default'); // Build the query
     *   $view->preExecute(); // Pre-execute the query.
     *   $view->execute(); // Run the query
     *   $output = $view->render(); // Render the view
     * @endcode
     *
     * If short circuited at any point, look in $view->build_info for
     * information about the query. After execute, look in $view->result
     * for the array of objects returned from \Drupal::database()->query().
     *
     * You can also do:
     * @code
     *   $view->setArguments($args);
     *   $output = $view->render('default'); // Render the view
     * @endcode
     *
     * This illustrates that render is smart enough to call build and execute
     * if these items have not already been accomplished.
     *
     * Note that execute also must accomplish other tasks, such as setting page
     * titles, and generating exposed filter data if necessary.
     */
    public function execute() {
        return $this->view
            ->render($this->display['id']);
    }

}