Same name in other branches

1. 8.9.x core/lib/Drupal/Core/Menu/MenuLinkTree.php \Drupal\Core\Menu\MenuLinkTree::buildItems()
2. 10 core/lib/Drupal/Core/Menu/MenuLinkTree.php \Drupal\Core\Menu\MenuLinkTree::buildItems()
3. 11.x core/lib/Drupal/Core/Menu/MenuLinkTree.php \Drupal\Core\Menu\MenuLinkTree::buildItems()

Builds the #items property for a menu tree's renderable array.

Helper function for ::build().

Parameters

\Drupal\Core\Menu\MenuLinkTreeElement[] $tree: A data structure representing the tree, as returned from MenuLinkTreeInterface::load().

\Drupal\Core\Cache\CacheableMetadata &$tree_access_cacheability: Internal use only. The aggregated cacheability metadata for the access results across the entire tree. Used when rendering the root level.

\Drupal\Core\Cache\CacheableMetadata &$tree_link_cacheability: Internal use only. The aggregated cacheability metadata for the menu links across the entire tree. Used when rendering the root level.

Return value

array The value to use for the #items property of a renderable menu.

Throws

\DomainException

1 call to MenuLinkTree::buildItems()

MenuLinkTree::build in core/lib/Drupal/Core/Menu/MenuLinkTree.php

Builds a renderable array from a menu tree.

File

core/lib/Drupal/Core/Menu/MenuLinkTree.php, line 213

Class

MenuLinkTree

Implements the loading, transforming and rendering of menu link trees.

Namespace

Drupal\Core\Menu

Code

protected function buildItems(array $tree, CacheableMetadata &$tree_access_cacheability, CacheableMetadata &$tree_link_cacheability) {
    $items = [];
    foreach ($tree as $data) {
        
        /** @var \Drupal\Core\Menu\MenuLinkInterface $link */
        $link = $data->link;
        // Generally we only deal with visible links, but just in case.
        if (!$link->isEnabled()) {
            continue;
        }
        if ($data->access !== NULL && !$data->access instanceof AccessResultInterface) {
            throw new \DomainException('MenuLinkTreeElement::access must be either NULL or an AccessResultInterface object.');
        }
        // Gather the access cacheability of every item in the menu link tree,
        // including inaccessible items. This allows us to render cache the menu
        // tree, yet still automatically vary the rendered menu by the same cache
        // contexts that the access results vary by.
        // However, if $data->access is not an AccessResultInterface object, this
        // will still render the menu link, because this method does not want to
        // require access checking to be able to render a menu tree.
        if ($data->access instanceof AccessResultInterface) {
            $tree_access_cacheability = $tree_access_cacheability->merge(CacheableMetadata::createFromObject($data->access));
        }
        // Gather the cacheability of every item in the menu link tree. Some links
        // may be dynamic: they may have a dynamic text (e.g. a "Hi, <user>" link
        // text, which would vary by 'user' cache context), or a dynamic route
        // name or route parameters.
        $tree_link_cacheability = $tree_link_cacheability->merge(CacheableMetadata::createFromObject($data->link));
        // Only render accessible links.
        if ($data->access instanceof AccessResultInterface && !$data->access
            ->isAllowed()) {
            continue;
        }
        $element = [];
        // Set a variable for the <li> tag. Only set 'expanded' to true if the
        // link also has visible children within the current tree.
        $element['is_expanded'] = FALSE;
        $element['is_collapsed'] = FALSE;
        if ($data->hasChildren && !empty($data->subtree)) {
            $element['is_expanded'] = TRUE;
        }
        elseif ($data->hasChildren) {
            $element['is_collapsed'] = TRUE;
        }
        // Set a helper variable to indicate whether the link is in the active
        // trail.
        $element['in_active_trail'] = FALSE;
        if ($data->inActiveTrail) {
            $element['in_active_trail'] = TRUE;
        }
        // Note: links are rendered in the menu.html.twig template; and they
        // automatically bubble their associated cacheability metadata.
        $element['attributes'] = new Attribute();
        $element['title'] = $link->getTitle();
        $element['url'] = $link->getUrlObject();
        $element['url']->setOption('set_active_class', TRUE);
        $element['below'] = $data->subtree ? $this->buildItems($data->subtree, $tree_access_cacheability, $tree_link_cacheability) : [];
        if (isset($data->options)) {
            $element['url']->setOptions(NestedArray::mergeDeep($element['url']->getOptions(), $data->options));
        }
        $element['original_link'] = $link;
        // Index using the link's unique ID.
        $items[$link->getPluginId()] = $element;
    }
    return $items;
}

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