CshsMenuParentFormSelector.php in Menu Link Weight 8

Namespace

Drupal\menu_link_weight\MenuParentFormSelector

File

src/MenuParentFormSelector/CshsMenuParentFormSelector.php

<?php

namespace Drupal\menu_link_weight\MenuParentFormSelector;

use Drupal\Component\Utility\Unicode;
use Drupal\Core\Cache\CacheableMetadata;
use Drupal\Core\Menu\MenuParentFormSelector;
use Drupal\Core\Menu\MenuTreeParameters;

/**
 * Implements Client-side hierarchical select (CSHS) as the menu parent form
 * selector.
 */
class CshsMenuParentFormSelector extends MenuParentFormSelector {

  /**
   * {@inheritdoc}
   */
  public function getParentSelectOptionsCshs($id = '', array $menus = NULL, CacheableMetadata &$cacheability = NULL) {
    if (!isset($menus)) {
      $menus = $this
        ->getMenuOptions();
    }
    $options = [];
    $depth_limit = $this
      ->getParentDepthLimit($id);
    foreach ($menus as $menu_name => $menu_title) {
      $options[$menu_name . ':'] = [
        'name' => '<' . $menu_title . '>',
        'parent_tid' => 0,
      ];
      $parameters = new MenuTreeParameters();
      $parameters
        ->setMaxDepth($depth_limit);
      $tree = $this->menuLinkTree
        ->load($menu_name, $parameters);
      $manipulators = [
        [
          'callable' => 'menu.default_tree_manipulators:checkNodeAccess',
        ],
        [
          'callable' => 'menu.default_tree_manipulators:checkAccess',
        ],
        [
          'callable' => 'menu.default_tree_manipulators:generateIndexAndSort',
        ],
      ];
      $tree = $this->menuLinkTree
        ->transform($tree, $manipulators);
      $this
        ->parentSelectOptionsTreeWalkCshs($tree, $menu_name, $menu_name . ':', $options, $id, $depth_limit, $cacheability);
    }
    return $options;
  }

  /**
   * {@inheritdoc}
   */
  public function parentSelectElement($menu_parent, $id = '', array $menus = NULL) {
    $options_cacheability = new CacheableMetadata();
    $options = $this
      ->getParentSelectOptionsCshs($id, $menus, $options_cacheability);

    // If no options were found, there is nothing to select.
    if ($options) {
      $element = [
        '#type' => 'cshs',
        '#options' => $options,
        '#attached' => [
          'library' => [
            'menu_link_weight/menu_parent_selector.cshs',
          ],
        ],
      ];
      if (!isset($options[$menu_parent])) {

        // The requested menu parent cannot be found in the menu anymore. Try
        // setting it to the top level in the current menu.
        list($menu_name, $parent) = explode(':', $menu_parent, 2);
        $menu_parent = $menu_name . ':';
      }
      if (isset($options[$menu_parent])) {

        // Only provide the default value if it is valid among the options.
        $element += [
          '#default_value' => $menu_parent,
        ];
      }
      $options_cacheability
        ->applyTo($element);
      return $element;
    }
    return [];
  }

  /**
   * {@inheritdoc}
   */
  protected function parentSelectOptionsTreeWalkCshs(array $tree, $menu_name, $indent, array &$options, $exclude, $depth_limit, CacheableMetadata &$cacheability = NULL) {

    /** @var \Drupal\Core\Menu\MenuLinkTreeElement[] $tree */
    foreach ($tree as $element) {
      if ($element->depth > $depth_limit) {

        // Don't iterate through any links on this level.
        break;
      }

      // Collect the cacheability metadata of the access result, as well as the
      // link.
      if ($cacheability) {
        $cacheability = $cacheability
          ->merge(CacheableMetadata::createFromObject($element->access))
          ->merge(CacheableMetadata::createFromObject($element->link));
      }

      // Only show accessible links.
      if (!$element->access
        ->isAllowed()) {
        continue;
      }
      $link = $element->link;
      if ($link
        ->getPluginId() != $exclude) {
        $title = Unicode::truncate($link
          ->getTitle(), 30, TRUE, FALSE);
        if (!$link
          ->isEnabled()) {
          $title .= ' (' . $this
            ->t('disabled') . ')';
        }
        $options[$menu_name . ':' . $link
          ->getPluginId()] = [
          'name' => $title,
          'parent_tid' => $indent,
        ];
        if (!empty($element->subtree)) {
          $this
            ->parentSelectOptionsTreeWalkCshs($element->subtree, $menu_name, $menu_name . ':' . $link
            ->getPluginId(), $options, $exclude, $depth_limit, $cacheability);
        }
      }
    }
  }

}

Classes

Name	Description
CshsMenuParentFormSelector	Implements Client-side hierarchical select (CSHS) as the menu parent form selector.