social_book_plus.module

<?php

/**
 * @file
 * Contains soical_book_plus.module.
 */

use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\Url;
use Drupal\group\Entity\GroupContent;

/**
 * Implements hook_help().
 */
function social_book_plus_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    // Main module help for the social_book_plus module.
    case 'help.page.social_book_plus':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('Collapsible book navigation block') . '</p>';
      return $output;

    default:
  }
}

/**
 * Implements hook_theme().
 */
function social_book_plus_theme() {
  return [
    'social_book_plus_block' => [
      'variables' => ['items' => [], 'attributes' => [], 'active_trail' => []],
    ],
  ];
}

/**
 * Add link for creating child book pages
 *
 * @param array $variables
 *   An associative array containing:
 */
function social_book_plus_preprocess_account_header_links(&$variables) {
  $node = \Drupal::routeMatch()->getParameter('node');

  if (is_object($node)) {
    $groupcontents = GroupContent::loadByEntity($node);
    $group = NULL;
    // Only react if it is actually posted inside a group.
    if (!empty($groupcontents)) {
      foreach ($groupcontents as $groupcontent) {
        $group = $groupcontent->getGroup();
        break;
      }
    }

    if (is_object($node) && is_object($group)) {
      $variables['links']['add']['below']['add_child_book_page'] = [
        'classes' => '',
        'link_attributes' => '',
        'link_classes' => '',
        'icon_classes' => '',
        'icon_label' => '',
        'title' => t('Add child page'),
        'label' => t('Add child page'),
        'title_classes' => '',
        'url' => Url::fromUserInput("/group/{$group->id()}/content/create/group_node:topic",
          [
            'query' => [
              'parent' => $node->id(),
            ],
          ]),
      ];
    }
  }
}