ptalk-8.x-0.x-dev/src/PtalkBreadcrumbBuilder.php

<?php

namespace Drupal\ptalk;

use Drupal\Core\Breadcrumb\BreadcrumbBuilderInterface;
use Drupal\Core\Breadcrumb\Breadcrumb;
use Drupal\Core\Link;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\StringTranslation\StringTranslationTrait;

/**
 * Class to define the ptalk breadcrumb builder.
 */
class PtalkBreadcrumbBuilder implements BreadcrumbBuilderInterface {
  use StringTranslationTrait;

  /**
   * {@inheritdoc}
   */
  public function applies(RouteMatchInterface $route_match) {
    return $route_match->getRouteName() == 'entity.ptalk_thread.canonical' && $route_match->getParameter('ptalk_thread');
  }

  /**
   * {@inheritdoc}
   */
  public function build(RouteMatchInterface $route_match) {
    $breadcrumb = new Breadcrumb();
    $breadcrumb->addCacheContexts(['route']);
    $breadcrumb->addLink(Link::createFromRoute($this->t('Home'), '<front>'));
    $breadcrumb->addLink(Link::createFromRoute($this->t('Private conversations'), 'entity.ptalk_thread.collection'));

    return $breadcrumb;
  }

}