vefl-8.x-2.x-dev/vefl.module

<?php

/**
 * @file
 * Module file for vefl.
 */

/**
 * Implements hook_theme().
 */
function vefl_theme($existing, $type, $theme, $path) {
  return [
    'vefl_views_exposed_form' => [
      'render element' => 'form',
      'theme path' => $path,
    ],
  ];
}

/**
 * Implements hook_theme_registry_alter().
 */
function vefl_theme_registry_alter(&$theme_registry) {
  // Inserts default views preprocess function before vefl preprocess function.
  $before = array_search('template_preprocess_vefl_views_exposed_form', $theme_registry['vefl_views_exposed_form']['preprocess functions']);
  array_splice($theme_registry['vefl_views_exposed_form']['preprocess functions'], $before, 0, ['template_preprocess_views_exposed_form']);
}

/**
 * A theme preprocess function for views_exposed_form.
 *
 * Adds $region_widgets array with separated by regions widgets.
 */
function template_preprocess_vefl_views_exposed_form(&$variables) {
  $form = $variables['form'];
  $configuration = $form['#vefl_configuration'];

  $regions = [];
  foreach ($configuration['regions'] as $region_name => $field_names) {
    $regions[$region_name] = [];

    foreach ($field_names as $field_name) {

      if (!empty($form['actions'][$field_name])) {
        $regions[$region_name][$field_name] = $form['actions'][$field_name];
        $regions[$region_name][$field_name]['#weight'] = $form['actions']['#weight'];
      }
      elseif (!empty($form[$field_name])) {
        $form[$field_name]['#title'] = NULL;
        $regions[$region_name][$field_name] = $form[$field_name];
        if (empty($form[$field_name]['#title'])) {
          $title = NULL;
          foreach ($form['#info'] as $filter_name => $filter_info) {
            // The $field_name always matches $filter_info['value'].
            if (0 === strpos($filter_name, 'filter-') && $filter_info['value'] === $field_name && !empty($filter_info['label'])) {
              $title = $filter_info['label'];
            }
          }
          $regions[$region_name][$field_name]['#title'] = $title;
        }
      }
    }
  }

  $layoutPluginManager = \Drupal::service('plugin.manager.core.layout');
  $layout = $layoutPluginManager->createInstance($configuration['layout']['id'], $configuration['layout']['settings']);
  $built = $layout->build($regions);

  $variables['form'] = $built;
}