russom_example_banner.module

<?php

/**
 * @file
 * Contains russom_example_banner.module.
 */

use Drupal\Core\Form\FormStateInterface;
use Drupal\node\Entity\Node;

/**
 * Implements hook_preprocess_page().
 */
function russom_example_banner_preprocess_page(&$variables) {
  // Get current banner id, if set.
  if ($current_banner_id = \Drupal::state()->get('current_banner_id')) {

    /*
     * Checks if user has 'view' permission.
     * Unpublished banner node will be shown to users with access to unpublished nodes.
     * Published banners will be shown to all user roles.
     */
    $user = \Drupal::currentUser();
    $banner = \Drupal::entityTypeManager()
      ->getStorage('node')
      ->load($current_banner_id);
    // Check that banner is not empty or null.
    if (!empty($banner)) {
      // Check view access to node.
      $view = $banner->access('view', $user);
      if ($view) {
        // Build banner node object.
        $build = \Drupal::entityTypeManager()
          ->getViewBuilder('node')
          ->view($banner, 'teaser');
        // Pass node object page variable.
        $variables['page']['banner'] = $build;
      }
    }

  }
}

/**
 * Implements hook_views_pre_render().
 */
function russom_example_banner_views_pre_render(\Drupal\views\ViewExecutable $view) {
  if ($view->id() == 'announcement_banner' && $view->current_display == 'page_1') {
    foreach ($view->result as $value) {
      // Apply administration level messages and notifications of banner settings to admin view page.
      $current_route_name = \Drupal::service('current_route_match')
        ->getRouteName();

      if ($current_route_name === 'view.announcement_banner.page_1') {
        // Set message for admin that banner is not set.
        if ($value->_entity->id() === \Drupal::state()
            ->get('current_banner_id')
        ) {
          if ($value->_entity->isPublished() == FALSE) {
            \Drupal::messenger()
              ->addWarning('The current banner, "' . $value->_entity->label() . '" is unpublished. Please publish the banner so all user roles can view the banner.');
          }

          // Current published banner, viewable to public.
          if ($value->_entity->isPublished()) {
            // Set current_banner flag for adding color-success class.
            $value->_entity->current_banner = TRUE;

            // Set message for admin that banner is set.
            \Drupal::messenger()
              ->addStatus('Current banner: "' . $value->_entity->label() . '" is published.');
          }
        }
      }
    }
  }
}

/**
 * Implements hook_form_alter().
 */
function russom_example_banner_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  if ($form_id == 'views_form_announcement_banner_page_1') {
    $form['actions']['save_order']['#submit'][] = 'russom_example_banner_draggableviews_form_submit';
    array_push($form['actions']['save_order']['#submit'], 'russom_example_banner_draggableviews_form_submit');
    $form['actions']['save_order']['#value'] = t('Activate the top banner');
  }
}

/**
 * Implements russom_example_banner_draggableviews_form_submit().
 */
function russom_example_banner_draggableviews_form_submit(&$form, FormStateInterface $form_state) {
  // Submit first row of user input values.
  $form_user_input = $form_state->getUserInput();
  $first_banner = reset($form_user_input['draggableviews']);
  _current_banner($first_banner['id']);
}

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

/**
 * Set current banner and log current banner.
 *
 * @param $id
 */
function _current_banner($id) {
  $node = Node::load($id);
  if (!empty($node)) {
    // Set banner id and log current banner as a state.
    \Drupal::state()->set('current_banner_id', $id);
  }
}

/**
 * Implements hook_preprocess_views_view_table().
 */
function russom_example_banner_preprocess_views_view_table($variables) {
  if ($variables['view']->id() == 'announcement_banner' && $variables['view']->current_display == 'page_1') {
    foreach ($variables['view']->result as $key => $value) {
      // Apply administration level messages and notifications of banner settings to admin view page.
      $current_route_name = \Drupal::service('current_route_match')
        ->getRouteName();

      if ($current_route_name == 'view.announcement_banner.page_1') {
        if ($value->_entity->current_banner) {
          // Add css to highlight banner in view list.
          $variables['rows'][$key]['attributes']->addClass('color-success');

          $new_value = $variables['rows'][$key];
          unset($variables['rows'][$key]);
          array_unshift($variables['rows'], $new_value);

        }
      }
    }
  }
}

/**
 * Implementation of hook_entity_view_alter();
 */
function russom_example_banner_node_view_alter(&$build, $entity, $display) {
  if (isset($build['#node'])
    && $build['#node']->bundle() == 'banner'
    && \Drupal::currentUser()->hasPermission('schedule editorial transition publish')) {
    // From russom_example_banner.links.contextual.yml 'group' name
    // Adds contextual link to admin announcement banner page.
    $build['#contextual_links']['russom_example_banner'] = [
      'route_parameters' => [],
    ];
  }
}