PageActions.php

<?php

declare (strict_types=1);
namespace Drupal\navigation\Plugin\TopBarItem;

use Drupal\Core\Cache\CacheableMetadata;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\navigation\Attribute\TopBarItem;
use Drupal\navigation\NavigationRenderer;
use Drupal\navigation\TopBarItemBase;
use Drupal\navigation\TopBarRegion;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Provides the Page Actions basic top bar item.
 */
final class PageActions extends TopBarItemBase implements ContainerFactoryPluginInterface {
    public function __construct(array $configuration, $plugin_id, $plugin_definition, NavigationRenderer $navigationRenderer) {
        parent::__construct($configuration, $plugin_id, $plugin_definition);
    }
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) : static {
        return new static($configuration, $plugin_id, $plugin_definition, $container->get(NavigationRenderer::class));
    }
    
    /**
     * {@inheritdoc}
     */
    public function build() : array {
        $build = [];
        // Local tasks for content entities.
        if ($this->navigationRenderer
            ->hasLocalTasks()) {
            $local_tasks = $this->navigationRenderer
                ->getLocalTasks();
            $build = [
                '#theme' => 'top_bar_local_tasks',
                '#local_tasks' => $local_tasks['tasks'],
            ];
            assert($local_tasks['cacheability'] instanceof CacheableMetadata);
            $local_tasks['cacheability']->applyTo($build);
        }
        return $build;
    }

}