NavigationTestHooks.php

<?php

declare (strict_types=1);
namespace Drupal\navigation_test\Hook;

use Drupal\Core\Cache\CacheableMetadata;
use Drupal\Core\Hook\Attribute\Hook;
use Drupal\Core\State\StateInterface;

/**
 * Hooks implementations for navigation_test module.
 */
class NavigationTestHooks {
    
    /**
     * NavigationTestHooks constructor.
     *
     * @param \Drupal\Core\State\StateInterface $state
     *   The state service.
     */
    public function __construct(StateInterface $state) {
    }
    
    /**
     * Implements hook_block_alter().
     */
    public function blockAlter(&$definitions) : void {
        if ($this->state
            ->get('navigation_safe_alter')) {
            $definitions['navigation_link']['allow_in_navigation'] = TRUE;
            $definitions['navigation_shortcuts']['allow_in_navigation'] = FALSE;
        }
    }
    
    /**
     * Implements hook_navigation_content_top().
     */
    public function navigationContentTop() : array {
        if (\Drupal::keyValue('navigation_test')->get('content_top')) {
            $items = [
                'navigation_foo' => [
                    '#markup' => 'foo',
                ],
                'navigation_bar' => [
                    '#markup' => 'bar',
                ],
                'navigation_baz' => [
                    '#markup' => 'baz',
                ],
            ];
        }
        else {
            $items = [
                'navigation_foo' => [],
                'navigation_bar' => [],
                'navigation_baz' => [],
            ];
        }
        // Add cache tags to our items to express a made up dependency to test
        // cacheability. Note that as we're always returning the same items,
        // sometimes only with cacheability metadata. By doing this we're testing
        // conditional rendering of content_top items.
        foreach ($items as &$element) {
            CacheableMetadata::createFromRenderArray($element)->addCacheTags([
                'navigation_test',
            ])
                ->applyTo($element);
        }
        return $items;
    }
    
    /**
     * Implements hook_navigation_content_top_alter().
     */
    public function navigationContentTopAlter(&$content_top) : void {
        if (\Drupal::keyValue('navigation_test')->get('content_top_alter')) {
            unset($content_top['navigation_foo']);
            $content_top['navigation_bar']['#markup'] = 'new bar';
            $content_top['navigation_baz']['#weight'] = '-100';
        }
    }
    
    /**
     * Implements hook_navigation_menu_link_tree_alter().
     */
    public function navigationMenuLinkTreeAlter(array &$tree) : void {
        foreach ($tree as $key => $item) {
            // Skip elements where menu is not the 'admin' one.
            $menu_name = $item->link
                ->getMenuName();
            // Removes all items from menu1.
            if ($menu_name == 'menu1') {
                unset($tree[$key]);
            }
            // Updates title for items in menu2
            if ($menu_name == 'menu2') {
                $item->link
                    ->updateLink([
                    'title' => 'New Link Title',
                ], FALSE);
            }
        }
    }

}