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<?php
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 = [];
/**
* 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.
$this->sortedNegotiators = [];
foreach ($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;
}
}
}
}
}