Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\block\Theme;
Chris@0: 
Chris@0: use Drupal\Core\Routing\RouteMatchInterface;
Chris@0: use Drupal\Core\Theme\ThemeNegotiatorInterface;
Chris@0: 
Chris@0: /**
Chris@0:  * Negotiates the theme for the block admin demo page via the URL.
Chris@0:  */
Chris@0: class AdminDemoNegotiator implements ThemeNegotiatorInterface {
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function applies(RouteMatchInterface $route_match) {
Chris@0:     return $route_match->getRouteName() == 'block.admin_demo';
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function determineActiveTheme(RouteMatchInterface $route_match) {
Chris@0:     // We return exactly what was passed in, to guarantee that the page will
Chris@0:     // always be displayed using the theme whose blocks are being configured.
Chris@0:     return $route_match->getParameter('theme');
Chris@0:   }
Chris@0: 
Chris@0: }