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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; | |
} | |
} | |
} | |
} | |
} |