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| <?php | |
| /** | |
| * @file | |
| * Contains \Drupal\Core\Theme\ThemeNegotiator. | |
| */ | |
| namespace Drupal\Core\Theme; | |
| use Drupal\Core\Routing\RouteMatchInterface; | |
| /** | |
| * Provides a class which determines the active theme of the page. | |
| * | |
| * It therefore uses ThemeNegotiatorInterface objects which are passed in | |
| * using the 'theme_negotiator' tag. | |
| */ | |
| class ThemeNegotiator implements ThemeNegotiatorInterface { | |
| /** | |
| * Holds arrays of theme negotiators, keyed by priority. | |
| * | |
| * @var array | |
| */ | |
| protected $negotiators = array(); | |
| /** | |
| * Holds the array of theme negotiators sorted by priority. | |
| * | |
| * Set to NULL if the array needs to be re-calculated. | |
| * | |
| * @var array|NULL | |
| */ | |
| protected $sortedNegotiators; | |
| /** | |
| * The access checker for themes. | |
| * | |
| * @var \Drupal\Core\Theme\ThemeAccessCheck | |
| */ | |
| protected $themeAccess; | |
| /** | |
| * Constructs a new ThemeNegotiator. | |
| * | |
| * @param \Drupal\Core\Theme\ThemeAccessCheck $theme_access | |
| * The access checker for themes. | |
| */ | |
| public function __construct(ThemeAccessCheck $theme_access) { | |
| $this->themeAccess = $theme_access; | |
| } | |
| /** | |
| * Adds a active theme negotiation service. | |
| * | |
| * @param \Drupal\Core\Theme\ThemeNegotiatorInterface $negotiator | |
| * The theme negotiator to add. | |
| * @param int $priority | |
| * Priority of the theme negotiator. | |
| */ | |
| public function addNegotiator(ThemeNegotiatorInterface $negotiator, $priority) { | |
| $this->negotiators[$priority][] = $negotiator; | |
| // Force the negotiators to be re-sorted. | |
| $this->sortedNegotiators = NULL; | |
| } | |
| /** | |
| * Returns the sorted array of theme negotiators. | |
| * | |
| * @return array|\Drupal\Core\Theme\ThemeNegotiatorInterface[] | |
| * An array of theme negotiator objects. | |
| */ | |
| protected function getSortedNegotiators() { | |
| if (!isset($this->sortedNegotiators)) { | |
| // Sort the negotiators according to priority. | |
| krsort($this->negotiators); | |
| // Merge nested negotiators from $this->negotiators into | |
| // $this->sortedNegotiators. | |
| $this->sortedNegotiators = array(); | |
| foreach ($this->negotiators as $builders) { | |
| $this->sortedNegotiators = array_merge($this->sortedNegotiators, $builders); | |
| } | |
| } | |
| return $this->sortedNegotiators; | |
| } | |
| /** | |
| * {@inheritdoc} | |
| */ | |
| public function applies(RouteMatchInterface $route_match) { | |
| return TRUE; | |
| } | |
| /** | |
| * {@inheritdoc} | |
| */ | |
| public function determineActiveTheme(RouteMatchInterface $route_match) { | |
| foreach ($this->getSortedNegotiators() as $negotiator) { | |
| if ($negotiator->applies($route_match)) { | |
| $theme = $negotiator->determineActiveTheme($route_match); | |
| if ($theme !== NULL && $this->themeAccess->checkAccess($theme)) { | |
| return $theme; | |
| } | |
| } | |
| } | |
| } | |
| } |