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71 lines
2.1 KiB
71 lines
2.1 KiB
5 years ago
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<?php
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namespace Drupal\twig_tweak\View;
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use Drupal\Core\Menu\MenuLinkTreeInterface;
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/**
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* MenuViewBuilder service.
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*/
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class MenuViewBuilder {
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/**
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* The menu link tree service.
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*
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* @var \Drupal\Core\Menu\MenuLinkTreeInterface
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*/
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protected $menuLinkTree;
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/**
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* Constructs a MenuViewBuilder object.
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*/
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public function __construct(MenuLinkTreeInterface $menu_link_tree) {
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$this->menuLinkTree = $menu_link_tree;
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}
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/**
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* Returns the render array for a menu.
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*
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* @param string $menu_name
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* The name of the menu.
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* @param int $level
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* (optional) Initial menu level.
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* @param int $depth
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* (optional) Maximum number of menu levels to display.
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* @param bool $expand
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* (optional) Expand all menu links.
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*
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* @return array
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* A render array for the menu.
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*
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* @see \Drupal\system\Plugin\Block\SystemMenuBlock::build()
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*/
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public function build(string $menu_name, int $level = 1, int $depth = 0, bool $expand = FALSE): array {
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$parameters = $this->menuLinkTree->getCurrentRouteMenuTreeParameters($menu_name);
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// Adjust the menu tree parameters based on the block's configuration.
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$parameters->setMinDepth($level);
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// When the depth is configured to zero, there is no depth limit. When depth
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// is non-zero, it indicates the number of levels that must be displayed.
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// Hence this is a relative depth that we must convert to an actual
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// (absolute) depth, that may never exceed the maximum depth.
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if ($depth > 0) {
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$parameters->setMaxDepth(min($level + $depth - 1, $this->menuLinkTree->maxDepth()));
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}
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// If expandedParents is empty, the whole menu tree is built.
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if ($expand) {
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$parameters->expandedParents = [];
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}
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$tree = $this->menuLinkTree->load($menu_name, $parameters);
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$manipulators = [
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['callable' => 'menu.default_tree_manipulators:checkAccess'],
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['callable' => 'menu.default_tree_manipulators:generateIndexAndSort'],
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];
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$tree = $this->menuLinkTree->transform($tree, $manipulators);
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return $this->menuLinkTree->build($tree);
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}
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}
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