/**
* 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, FormStateInterface $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->setIfNotExists('menu_overview_form_parents', array());
$form['#attached']['css'] = array(drupal_get_path('module', 'menu') . '/css/menu.admin.css');
$tree = $this->menuTree->load($this->entity->id(), new MenuTreeParameters());
// We indicate that a menu administrator is running the menu access check.
$this->getRequest()->attributes->set('_menu_admin', TRUE);
$manipulators = array(array('callable' => 'menu.default_tree_manipulators:checkAccess'), array('callable' => 'menu.default_tree_manipulators:generateIndexAndSort'));
$tree = $this->menuTree->transform($tree, $manipulators);
$this->getRequest()->attributes->set('_menu_admin', FALSE);
// Determine the delta; the number of weights to be made available.
$count = function (array $tree) {
$sum = function ($carry, MenuLinkTreeElement $item) {
return $carry + $item->count();
};
return array_reduce($tree, $sum);
};
$delta = max($count($tree), 50);
$form = array_merge($form, $this->buildOverviewTreeForm($tree, $delta));
$destination = $this->getUrlGenerator()->getPathFromRoute('menu_ui.menu_edit', array('menu' => $this->entity->id()));
$url = $destination = $this->url('menu_link_content.link_add', array('menu' => $this->entity->id()), array('query' => array('destination' => $destination)));
$form['#empty_text'] = $this->t('There are no menu links yet. <a href="@url">Add link</a>.', array('@url' => $url));
return $form;
}
