navigation.module

<?php


/**
 * @file
 * Primary module hooks for navigation module.
 */
use Drupal\Component\Plugin\PluginBase;
use Drupal\Core\Block\BlockPluginInterface;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\navigation\NavigationContentLinks;
use Drupal\navigation\NavigationRenderer;
use Drupal\navigation\Plugin\SectionStorage\NavigationSectionStorage;
use Drupal\navigation\RenderCallbacks;

/**
 * Implements hook_help().
 */
function navigation_help($route_name, RouteMatchInterface $route_match) {
    switch ($route_name) {
        case 'help.page.navigation':
            $output = '';
            $output .= '<h3>' . t('About') . '</h3>';
            $output .= '<p>' . t('The Navigation module provides a left-aligned, collapsible, vertical sidebar navigation.') . '</p>';
            $output .= '<p>' . t('For more information, see the <a href=":docs">online documentation for the Navigation module</a>.', [
                ':docs' => 'https://www.drupal.org/project/navigation',
            ]) . '</p>';
            return $output;
    }
    $configuration_route = 'layout_builder.navigation.';
    if (!$route_match->getRouteObject()
        ->getOption('_layout_builder') || !str_starts_with($route_name, $configuration_route)) {
        return layout_builder_help($route_name, $route_match);
    }
    if (str_starts_with($route_name, $configuration_route)) {
        $output = '<p>' . t('This layout builder tool allows you to configure the blocks in the navigation toolbar.') . '</p>';
        $output .= '<p>' . t('Forms and links inside the content of the layout builder tool have been disabled.') . '</p>';
        return $output;
    }
}

/**
 * Implements hook_page_top().
 */
function navigation_page_top(array &$page_top) {
    if (!\Drupal::currentUser()->hasPermission('access navigation')) {
        return;
    }
    $navigation_renderer = \Drupal::service('navigation.renderer');
    assert($navigation_renderer instanceof NavigationRenderer);
    $navigation_renderer->removeToolbar($page_top);
    if (\Drupal::routeMatch()->getRouteName() !== 'layout_builder.navigation.view') {
        // Don't render the admin toolbar if in layout edit mode.
        $navigation_renderer->buildNavigation($page_top);
        $navigation_renderer->buildTopBar($page_top);
        return;
    }
    // But if in layout mode, add an empty element to leave space. We need to use
    // an empty .admin-toolbar element because the css uses the adjacent sibling
    // selector. The actual rendering of the navigation blocks/layout occurs in
    // the layout form.
    $page_top['navigation'] = [
        '#type' => 'html_tag',
        '#tag' => 'aside',
        '#attributes' => [
            'class' => 'admin-toolbar',
        ],
    ];
    $navigation_renderer->buildTopBar($page_top);
}

/**
 * Implements hook_module_implements_alter().
 */
function navigation_module_implements_alter(&$implementations, $hook) {
    if ($hook == 'page_top') {
        $group = $implementations['navigation'];
        unset($implementations['navigation']);
        $implementations['navigation'] = $group;
    }
    if ($hook == 'help') {
        // We take over the layout_builder hook_help().
        unset($implementations['layout_builder']);
    }
}

/**
 * Implements hook_theme().
 */
function navigation_theme($existing, $type, $theme, $path) {
    $items['top_bar'] = [
        'variables' => [
            'local_tasks' => [],
        ],
    ];
    $items['top_bar_local_tasks'] = [
        'variables' => [
            'local_tasks' => [],
        ],
    ];
    $items['top_bar_local_task'] = [
        'variables' => [
            'link' => [],
        ],
    ];
    $items['big_pipe_interface_preview__navigation_shortcut_lazy_builder_lazyLinks__Shortcuts'] = [
        'variables' => [
            'callback' => NULL,
            'arguments' => NULL,
            'preview' => NULL,
        ],
        'base hook' => 'big_pipe_interface_preview',
    ];
    $items['block__navigation'] = [
        'render element' => 'elements',
        'base hook' => 'block',
    ];
    $items['navigation_menu'] = [
        'base hook' => 'menu',
        'variables' => [
            'menu_name' => NULL,
            'title' => NULL,
            'items' => [],
            'attributes' => [],
        ],
    ];
    $items['menu_region__footer'] = [
        'variables' => [
            'help' => NULL,
            'items' => [],
            'title' => NULL,
            'menu_name' => NULL,
        ],
    ];
    return $items;
}

/**
 * Implements hook_menu_links_discovered_alter().
 */
function navigation_menu_links_discovered_alter(&$links) {
    $navigation_links = \Drupal::classResolver(NavigationContentLinks::class);
    assert($navigation_links instanceof NavigationContentLinks);
    $navigation_links->addMenuLinks($links);
    $navigation_links->removeAdminContentLink($links);
    $navigation_links->removeHelpLink($links);
}

/**
 * Implements hook_block_build_BASE_BLOCK_ID_alter().
 */
function navigation_block_build_local_tasks_block_alter(array &$build, BlockPluginInterface $block) {
    $navigation_renderer = \Drupal::service('navigation.renderer');
    assert($navigation_renderer instanceof NavigationRenderer);
    $navigation_renderer->removeLocalTasks($build, $block);
}

/**
 * Implements hook_plugin_filter_TYPE__CONSUMER_alter().
 *
 * Curate the blocks available in the Layout Builder "Add Block" UI.
 */
function navigation_plugin_filter_block__layout_builder_alter(array &$definitions, array $extra) {
    if (($extra['section_storage'] ?? NULL) instanceof NavigationSectionStorage) {
        // Remove all blocks other than the ones we support.
        $navigation_safe = [
            'navigation_user',
            'navigation_shortcuts',
            'navigation_menu',
        ];
        $definitions = array_filter($definitions, static function (array $definition, string $plugin_id) use ($navigation_safe) : bool {
            [
                $base_plugin_id,
            ] = explode(PluginBase::DERIVATIVE_SEPARATOR, $plugin_id);
            return in_array($base_plugin_id, $navigation_safe, TRUE);
        }, ARRAY_FILTER_USE_BOTH);
    }
}

/**
 * Implements hook_plugin_filter_TYPE__CONSUMER_alter().
 */
function navigation_plugin_filter_layout__layout_builder_alter(array &$definitions, array $extra) {
    if (($extra['section_storage'] ?? NULL) instanceof NavigationSectionStorage) {
        // We don't allow adding a new section.
        $definitions = [];
    }
}

/**
 * Implements hook_block_alter().
 */
function navigation_block_alter(&$definitions) : void {
    $hidden = [
        'navigation_user',
        'navigation_shortcuts',
        'navigation_menu',
    ];
    foreach ($hidden as $block_id) {
        if (isset($definitions[$block_id])) {
            $definitions[$block_id]['_block_ui_hidden'] = TRUE;
        }
    }
}

/**
 * Implements hook_element_info_alter().
 */
function navigation_element_info_alter(array &$info) {
    if (array_key_exists('layout_builder', $info)) {
        $info['layout_builder']['#pre_render'][] = [
            RenderCallbacks::class,
            'alterLayoutBuilder',
        ];
    }
}