ihorizons_next_article.module

<?php

/**
 * @file
 * Contains ihorizons_next_article.module.
 */
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\node\NodeTypeInterface;
use Drupal\node\Entity\NodeType;
use Drupal\Core\Routing;
use Drupal\node\NodeInterface;

/**
 * Implements hook_help().
 */
function ihorizons_next_article_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    // Main module help for the ihorizons_next_article module.
    case 'help.page.ihorizons_next_article':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('This module provide functionality to load next url without refreshing the page.') . '</p>';
      return $output;

    default:
  }
}

/**
 * Implements hook_preprocess_node().
 */
function ihorizons_next_article_preprocess_node(&$variables) {

  if (!empty($variables['node']->bundle())) {
    $node_config = NodeType::load($variables['node']->bundle());
    $node_config = $node_config->getThirdPartySettings('ihorizons_next_article');
    if (!empty($node_config['infinite_scroll'])) {
      // Set next pages list
      $pages = [];
      $entity = \Drupal::entityQuery('node');
      $entity->condition('status', 1)
        ->condition('type', $variables['node']->bundle())
        ->condition('nid', $variables['node']->id(), '!=')
        ->sort('created', $node_config['next_article_order']);
      $result = $entity->execute();

      if (!empty($result)) {
        foreach ($result as $node) {
          $node = \Drupal::service('entity_type.manager')->getStorage('node')->load($node);
          $pages[] = $node->toUrl()->setAbsolute()->toString();
        }
      }
      $variables['#attached']['library'][] = 'ihorizons_next_article/infinite_scroll';
      $variables['#attached']['drupalSettings']['ihorizons_next_article']['infiniteScroll']['next_articles'] = $pages;
      $variables['#attached']['drupalSettings']['ihorizons_next_article']['infiniteScroll']['wrapper_class'] = $node_config['wrapper_class'];
    }
  }
}

/**
 * Implements template_preprocess_region().
 */
function ihorizons_next_article_preprocess_block(&$variables) {
  if ($variables['plugin_id'] == 'system_main_block') {
    $route_match = \Drupal::service('current_route_match');
    $node = $route_match->getParameter('node');
    if ($node instanceof NodeInterface) {
      $node_config = NodeType::load($node->bundle());
      $node_config = $node_config->getThirdPartySettings('ihorizons_next_article');
      $variables['attributes']['class'][] = $node_config['wrapper_class'];
    }
  }
}

/**
 * Implements hook_form_FORM_ID_alter().
 *
 * {@inheritdoc}
 */
function ihorizons_next_article_form_node_type_form_alter(&$form, FormStateInterface $form_state) {
  $type = $form_state->getFormObject()->getEntity();
  $form['next_article'] = [
    '#type' => 'details',
    '#title' => t('Next Article settings'),
    '#attached' => [
      'library' => ['menu_ui/drupal.menu_ui.admin'],
    ],
    '#group' => 'additional_settings',
  ];
  $form['next_article']['infinite_scroll'] = [
    '#type' => 'checkbox',
    '#title' => t('Enable Infinite Scroll'),
    '#default_value' => $type->getThirdPartySetting('ihorizons_next_article', 'infinite_scroll'),
    '#description' => t('Check this box if you want to auto load next article on node detail page.'),
  ];
  $form['next_article']['wrapper_class'] = [
    '#type' => 'textfield',
    '#title' => t('Infinite Scroll Wrapper Class'),
    '#default_value' => $type->getThirdPartySetting('ihorizons_next_article', 'wrapper_class'),
    '#description' => t('Add html wrapper class which will be used as parent wrapper class for infinite scroll library.'),
  ];
  $form['next_article']['next_article_order'] = [
    '#type' => 'select',
    '#title' => t('Next Article: Order by published date'),
    '#options' => ['asc' => t('ASC'), 'desc' => t('DESC')],
    '#default_value' => $type->getThirdPartySetting('ihorizons_next_article', 'next_article_order'),
    '#description' => t('How should node load on auto scroll.'),
  ];

  $form['#entity_builders'][] = 'ihorizons_next_article_form_node_type_form_builder';
}

/**
 * Entity builder for the node type form with next article options.
 *
 * @see ihorizons_next_article_form_node_type_form_alter()
 */
function ihorizons_next_article_form_node_type_form_builder($entity_type, NodeTypeInterface $type, &$form, FormStateInterface $form_state) {
  if ($form_state->getValue('infinite_scroll') && $form_state->getValue('wrapper_class')) {
    $type->setThirdPartySetting(
      'ihorizons_next_article', 'infinite_scroll',
      $form_state->getValue('infinite_scroll')
    );
    $type->setThirdPartySetting(
      'ihorizons_next_article', 'wrapper_class',
      $form_state->getValue('wrapper_class')
    );
    $type->setThirdPartySetting(
      'ihorizons_next_article', 'next_article_order',
      $form_state->getValue('next_article_order')
    );
    return;
  }
  $type->unsetThirdPartySetting('ihorizons_next_article', 'infinite_scroll');
  $type->unsetThirdPartySetting('ihorizons_next_article', 'wrapper_class');
  $type->unsetThirdPartySetting('ihorizons_next_article', 'next_article_order');
}