class AnnounceController

class AnnounceController extends ControllerBase implements ContainerInjectionInterface {
    
    /**
     * Constructs an AnnounceController object.
     *
     * @param \Drupal\announcements_feed\AnnounceRenderer $announceRenderer
     *   The AnnounceRenderer service.
     */
    public function __construct(AnnounceRenderer $announceRenderer) {
    }
    
    /**
     * Returns the list of Announcements.
     *
     * @param \Symfony\Component\HttpFoundation\Request $request
     *   The request.
     *
     * @return array
     *   A build array with announcements.
     */
    public function getAnnouncements(Request $request) : array {
        $build = $this->announceRenderer
            ->render();
        if ($request->query
            ->get('_wrapper_format') != 'drupal_dialog.off_canvas') {
            $build['#theme'] = 'announcements_feed_admin';
            $build['#attached'] = [];
        }
        return $build;
    }

}