add_child_page-8.x-1.0/add_child_page.module

<?php

/**
 * @file
 * Contains hooks for Add Child Page module.
 */

use Drupal\Core\Form\FormStateInterface;
use Drupal\Component\Utility\Html;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\Menu\MenuTreeParameters;

/**
 * Implements hook_help().
 */
function add_child_page_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    case 'help.page.add_child_page':
      $text = file_get_contents(__DIR__ . '/README.md');
      if (!\Drupal::moduleHandler()->moduleExists('markdown')) {
        return '<pre>' . Html::escape($text) . '</pre>';
      }
      else {
        // Use the Markdown filter to render the README.
        $filter_manager = \Drupal::service('plugin.manager.filter');
        $settings = \Drupal::configFactory()->get('markdown.settings')->getRawData();
        $config = ['settings' => $settings];
        $filter = $filter_manager->createInstance('markdown', $config);
        return $filter->process($text, 'en');
      }
  }
  return NULL;
}

/**
 * Implements hook_form_alter().
 */
function add_child_page_form_alter(&$form, FormStateInterface $form_state, $form_id) {

  $id = \Drupal::request()->query->get('plid');
  $menu_name = \Drupal::request()->query->get('menu');

  if (isset($id) && isset($menu_name)) {
    $config = \Drupal::config('add_child_page.settings');

    if (!$config->isNew()) {
      $node_types = $config->get('node_types');

      $ids = [];
      foreach ($node_types as $types) {
        $ids[] = 'node_' . $types . '_form';
      }

      if (in_array($form_id, $ids)) {
        $parent = add_child_page_get_plid($id);
        $menu_parameters = new MenuTreeParameters();
        $menu_parameters->setMaxDepth(1);
        $menu_parameters->setRoot('menu_link_content:' . $parent);
        $menu_parameters->excludeRoot();
        $menu_tree_service = \Drupal::service('menu.link_tree');
        $tree = $menu_tree_service->load($menu_name, $menu_parameters);
        $weights = [];
        foreach ($tree as $item) {
          $weights[] = $item->link->getWeight();
        }
        $weight = (!empty($weights) ? max($weights) + 1 : 0);

        $form['menu']['enabled']['#default_value'] = 1;
        $form['menu']['#open'] = TRUE;
        $form['menu']['link']['menu_parent']['#default_value'] = $menu_name . ':menu_link_content:' . $parent;
        $form['menu']['link']['menu_parent']['#value'] = $menu_name . ':menu_link_content:' . $parent;
        $form['menu']['link']['weight']['#default_value'] = $weight;
        // This is needed in order to create the menu_link join path token
        // for users without the administrator menu permission.
        // See more in token_form_node_form_alter in the token module.
        $form['#entity_builders'][] = 'token_node_menu_link_submit';
      }
    }
  }
}

/**
 * Helper to return the uuid of the parent.
 */
function add_child_page_get_plid($id) {
  $connection = \Drupal::database();
  $query = $connection->select('menu_link_content', 'link');
  $query->fields('link', ['uuid']);
  $query->condition('link.id', $id);
  $result = $query->execute()->fetchCol();
  return reset($result);
}

/**
 * Implements hook_module_implements_alter().
 */
function add_child_page_module_implements_alter(&$implementations, $hook) {
  if ($hook == 'form_alter') {
    $group = $implementations['add_child_page'];
    unset($implementations['add_child_page']);
    $implementations['add_child_page'] = $group;
  }
}