BlockContentAddLocalAction.php

<?php

namespace Drupal\block_content\Plugin\Menu\LocalAction;

use Drupal\Core\Menu\LocalActionDefault;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\Routing\RouteProviderInterface;
use Drupal\Core\Url;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\HttpFoundation\RequestStack;

/**
 * Modifies the 'Add content block' local action.
 */
class BlockContentAddLocalAction extends LocalActionDefault {
    
    /**
     * Constructs a BlockContentAddLocalAction object.
     */
    public function __construct(array $configuration, $plugin_id, $plugin_definition, RouteProviderInterface $routeProvider, RequestStack $requestStack) {
        parent::__construct($configuration, $plugin_id, $plugin_definition, $routeProvider);
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
        return new static($configuration, $plugin_id, $plugin_definition, $container->get('router.route_provider'), $container->get('request_stack'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function getOptions(RouteMatchInterface $route_match) {
        $options = parent::getOptions($route_match);
        // If the route specifies a theme, append it to the query string.
        if ($theme = $route_match->getParameter('theme')) {
            $options['query']['theme'] = $theme;
        }
        // If the current request has a region, append it to the query string.
        if ($region = $this->requestStack
            ->getCurrentRequest()->query
            ->getString('region')) {
            $options['query']['region'] = $region;
        }
        // Adds a destination on content block listing.
        if ($route_match->getRouteName() == 'entity.block_content.collection') {
            $options['query']['destination'] = Url::fromRoute('<current>')->toString();
        }
        return $options;
    }

}