visualn-8.x-1.x-dev/modules/visualn_views/visualn_views.module

<?php

/**
 * @file
 * Contains visualn_views.module.
 */

use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\visualn\Entity\VisualNStyle;
use Drupal\Core\Template\Attribute;
use Drupal\views\ViewExecutable;

/**
 * Implements hook_help().
 */
function visualn_views_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    // Main module help for the visualn_views module.
    case 'help.page.visualn_views':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('Enables VisualN support for Views') . '</p>';
      return $output;

    default:
  }
}

/**
 * Implements hook_views_pre_build().
 */
function visualn_views_views_pre_build(ViewExecutable $view) {
  // @todo: check display style type

  // enable exposed form for the view even if there are no exposed handlers
  // @see ViewExecutable::build() and visualn_form_alter()
  // @todo: this check is requried sometimes, e.g. for full entities view
  //    though it is strange (?)
  if (!empty($view->style_plugin)) {
    $options = $view->style_plugin->options;
    if (isset($options['expose_keys_mapping']) && $options['expose_keys_mapping'] == 1) {
      $view->display_handler->has_exposed = TRUE;
    }
  }
}

/**
 * Implements hook_form_alter().
 */
function visualn_views_form_alter(&$form, $form_state, $form_id) {
  // @todo: maybe use display extender
  // @todo: this is temporary solution
  // @todo: check style plugin type, should be visualn
  if ($form_id == 'views_exposed_form') {
    $displayHandler = $form_state->getStorage()['view']->getDisplay();
    $style_plugin = $form_state->getStorage()['view']->style_plugin;
    $options = $style_plugin->options;
    if (isset($options['expose_keys_mapping']) && $options['expose_keys_mapping'] == 1) {
      // get visualn style drawer keys and prepare mappings form
      $visualn_style_id = $options['visualn_style_id'];
      if ($visualn_style_id) {
        $visualn_style = \Drupal::service('entity_type.manager')->getStorage('visualn_style')->load($visualn_style_id);
        $drawer_plugin = $visualn_style->getDrawerPlugin();
        $drawer_config = $options['drawer_config'];
        $drawer_plugin->setConfiguration($drawer_config);
        $data_keys = $drawer_plugin->dataKeys();
        if (!empty($data_keys)) {
          // @todo: form key should be unique to avoid conflicts with exposed handlers keys
          $form['drawer_fields'] = [
            '#type' => 'table',
            '#header' => [t('Data key'), t('Field')],
          ];
          $field_names = $displayHandler->getFieldLabels();
          foreach ($data_keys as $data_key) {
            $form['drawer_fields'][$data_key]['label'] = [
              '#plain_text' => $data_key,
            ];
            $form['drawer_fields'][$data_key]['field'] = [
              '#type' => 'select',
              '#options' => $field_names,
              '#default_value' => isset($options['drawer_fields'][$data_key]) ? $options['drawer_fields'][$data_key] : '',
            ];
          }
        }
      }
    }
  }
}


//function template_preprocess_views_view_visualn(&$variables) {}