/**
* {@inheritdoc}
*/
public function getCacheKeys()
{
// Add a key for the active menu trail.
$menu = $this->getDerivativeId();
$active_trail = $this->menuTree->getActiveTrailIds($menu);
$active_trail_key = 'trail.' . implode('|', $active_trail);
return array_merge(parent::getCacheKeys(), array($active_trail_key));
}
/**
* Form constructor to edit an entire menu tree at once.
*
* Shows for one menu the menu links accessible to the current user and
* relevant operations.
*
* This form constructor can be integrated as a section into another form. It
* relies on the following keys in $form_state:
* - menu: A menu entity.
* - menu_overview_form_parents: An array containing the parent keys to this
* form.
* Forms integrating this section should call menu_overview_form_submit() from
* their form submit handler.
*/
protected function buildOverviewForm(array &$form, array &$form_state)
{
// Ensure that menu_overview_form_submit() knows the parents of this form
// section.
$form['#tree'] = TRUE;
$form['#theme'] = 'menu_overview_form';
$form_state += array('menu_overview_form_parents' => array());
$form['#attached']['css'] = array(drupal_get_path('module', 'menu') . '/css/menu.admin.css');
$links = array();
$query = $this->entityQueryFactory->get('menu_link')->condition('menu_name', $this->entity->id());
for ($i = 1; $i <= MENU_MAX_DEPTH; $i++) {
$query->sort('p' . $i, 'ASC');
}
$result = $query->execute();
if (!empty($result)) {
$links = $this->menuLinkStorage->loadMultiple($result);
}
$delta = max(count($links), 50);
// We indicate that a menu administrator is running the menu access check.
$this->getRequest()->attributes->set('_menu_admin', TRUE);
$tree = $this->menuTree->buildTreeData($links);
$this->getRequest()->attributes->set('_menu_admin', FALSE);
$form = array_merge($form, $this->buildOverviewTreeForm($tree, $delta));
$form['#empty_text'] = t('There are no menu links yet. <a href="@link">Add link</a>.', array('@link' => url('admin/structure/menu/manage/' . $this->entity->id() . '/add')));
return $form;
}