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<?php
namespace Drupal\taxonomy;
use Drupal\Core\Breadcrumb\BreadcrumbBuilderInterface;
use Drupal\Core\Breadcrumb\Breadcrumb;
use Drupal\Core\Entity\EntityManagerInterface;
use Drupal\Core\Link;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\StringTranslation\StringTranslationTrait;
/**
* Provides a custom taxonomy breadcrumb builder that uses the term hierarchy.
*/
class TermBreadcrumbBuilder implements BreadcrumbBuilderInterface {
use StringTranslationTrait;
/**
* The entity manager.
*
* @var \Drupal\Core\Entity\EntityManagerInterface
*/
protected $entityManager;
/**
* The taxonomy storage.
*
* @var \Drupal\Taxonomy\TermStorageInterface
*/
protected $termStorage;
/**
* Constructs the TermBreadcrumbBuilder.
*
* @param \Drupal\Core\Entity\EntityManagerInterface $entityManager
* The entity manager.
*/
public function __construct(EntityManagerInterface $entityManager) {
$this->entityManager = $entityManager;
$this->termStorage = $entityManager->getStorage('taxonomy_term');
}
/**
* {@inheritdoc}
*/
public function applies(RouteMatchInterface $route_match) {
return $route_match->getRouteName() == 'entity.taxonomy_term.canonical'
&& $route_match->getParameter('taxonomy_term') instanceof TermInterface;
}
/**
* {@inheritdoc}
*/
public function build(RouteMatchInterface $route_match) {
$breadcrumb = new Breadcrumb();
$breadcrumb->addLink(Link::createFromRoute($this->t('Home'), '<front>'));
$term = $route_match->getParameter('taxonomy_term');
// Breadcrumb needs to have terms cacheable metadata as a cacheable
// dependency even though it is not shown in the breadcrumb because e.g. its
// parent might have changed.
$breadcrumb->addCacheableDependency($term);
// @todo This overrides any other possible breadcrumb and is a pure
// hard-coded presumption. Make this behavior configurable per
// vocabulary or term.
$parents = $this->termStorage->loadAllParents($term->id());
// Remove current term being accessed.
array_shift($parents);
foreach (array_reverse($parents) as $term) {
$term = $this->entityManager->getTranslationFromContext($term);
$breadcrumb->addCacheableDependency($term);
$breadcrumb->addLink(Link::createFromRoute($term->getName(), 'entity.taxonomy_term.canonical', ['taxonomy_term' => $term->id()]));
}
// This breadcrumb builder is based on a route parameter, and hence it
// depends on the 'route' cache context.
$breadcrumb->addCacheContexts(['route']);
return $breadcrumb;
}
}