Determine the active theme for the request.

Parameters

\Drupal\Core\Routing\RouteMatchInterface $route_match: The current route match object.

Return value

string|null The name of the theme, or NULL if other negotiators, like the configured default one, should be used instead.

Overrides ThemeNegotiatorInterface::determineActiveTheme

File

core/lib/Drupal/Core/Theme/ThemeNegotiator.php, line 63

Class

ThemeNegotiator

Provides a class which determines the active theme of the page.

Namespace

Drupal\Core\Theme

Code

public function determineActiveTheme(RouteMatchInterface $route_match) {
  foreach ($this->negotiators as $negotiator_id) {
    $negotiator = $this->classResolver
      ->getInstanceFromDefinition($negotiator_id);
    if ($negotiator->applies($route_match)) {
      $theme = $negotiator->determineActiveTheme($route_match);
      if ($theme !== NULL && $this->themeAccess
        ->checkAccess($theme)) {
        return $theme;
      }
    }
  }
}

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