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<?php | |
/** | |
* @file | |
* Contains \Drupal\Core\Menu\MenuLinkTreeElement. | |
*/ | |
namespace Drupal\Core\Menu; | |
/** | |
* Provides a value object to model an element in a menu link tree. | |
* | |
* \Drupal\Core\Menu\MenuLinkTreeElement objects represent a menu link's data. | |
* Objects of this class provide complimentary data: the placement in a tree. | |
* Therefore, we can summarize this split as follows: | |
* - Menu link objects contain all information about an individual menu link, | |
* plus what their parent is. But they don't know where exactly in a menu link | |
* tree they live. | |
* - Instances of this class are complimentary to those objects, they know: | |
* - All additional metadata from {menu_tree}, which contains "materialized" | |
* metadata about a menu link tree, such as whether a link in the tree has | |
* visible children and the depth relative to the root. | |
* - Plus all additional metadata that's adjusted for the current tree query, | |
* such as whether the link is in the active trail, whether the link is | |
* accessible for the current user, and the link's children (which are only | |
* loaded if the link was marked as "expanded" by the query). | |
* | |
* @see \Drupal\Core\Menu\MenuTreeStorage::loadTreeData() | |
*/ | |
class MenuLinkTreeElement { | |
/** | |
* The menu link for this element in a menu link tree. | |
* | |
* @var \Drupal\Core\Menu\MenuLinkInterface | |
*/ | |
public $link; | |
/** | |
* The subtree of this element in the menu link tree (this link's children). | |
* | |
* (Children of a link are only loaded if a link is marked as "expanded" by | |
* the query.) | |
* | |
* @var \Drupal\Core\Menu\MenuLinkTreeElement[] | |
*/ | |
public $subtree; | |
/** | |
* The depth of this link relative to the root of the tree. | |
* | |
* @var int | |
*/ | |
public $depth; | |
/** | |
* Whether this link has any children at all. | |
* | |
* @var bool | |
*/ | |
public $hasChildren; | |
/** | |
* Whether this link is in the active trail. | |
* | |
* @var bool | |
*/ | |
public $inActiveTrail; | |
/** | |
* Whether this link is accessible by the current user. | |
* | |
* If the value is NULL the access was not determined yet, if an access result | |
* object, it was determined already. | |
* | |
* @var \Drupal\Core\Access\AccessResultInterface|NULL | |
*/ | |
public $access; | |
/** | |
* Additional options for this link. | |
* | |
* This is merged (\Drupal\Component\Utility\NestedArray::mergeDeep()) with | |
* \Drupal\Core\Menu\MenuLinkInterface::getOptions(), to allow menu link tree | |
* manipulators to add or override link options. | |
*/ | |
public $options = array(); | |
/** | |
* Constructs a new \Drupal\Core\Menu\MenuLinkTreeElement. | |
* | |
* @param \Drupal\Core\Menu\MenuLinkInterface $link | |
* The menu link for this element in the menu link tree. | |
* @param bool $has_children | |
* A flag as to whether this element has children even if they are not | |
* included in the tree (i.e. this may be TRUE even if $subtree is empty). | |
* @param int $depth | |
* The depth of this element relative to the tree root. | |
* @param bool $in_active_trail | |
* A flag as to whether this link was included in the list of active trail | |
* IDs used to build the tree. | |
* @param \Drupal\Core\Menu\MenuLinkTreeElement[] $subtree | |
* The children of this element in the menu link tree. | |
*/ | |
public function __construct(MenuLinkInterface $link, $has_children, $depth, $in_active_trail, array $subtree) { | |
// Essential properties. | |
$this->link = $link; | |
$this->hasChildren = $has_children; | |
$this->depth = $depth; | |
$this->subtree = $subtree; | |
$this->inActiveTrail = $in_active_trail; | |
} | |
/** | |
* Counts all menu links in the current subtree. | |
* | |
* @return int | |
* The number of menu links in this subtree (one plus the number of menu | |
* links in all descendants). | |
*/ | |
public function count() { | |
$sum = function ($carry, MenuLinkTreeElement $element) { | |
return $carry + $element->count(); | |
}; | |
return 1 + array_reduce($this->subtree, $sum); | |
} | |
} |