ws_small_y-1.0.x-dev/modules/small_y_carousels/small_y_carousels.module

<?php

use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Render\Markup;


/**
 * Implements hook_form_alter().
 */
function small_y_carousels_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  if (in_array($form_id, [
    'layout_builder_add_block',
    'layout_builder_update_block'
  ])) {
    $component_config = $form_id === 'layout_builder_add_block' ?
      $form_state->getStorage()['layout_builder__component']->get('configuration') :
      $form_state->getBuildInfo()['callback_object']->getCurrentComponent()->get('configuration');

    if ($component_config['id'] === 'inline_block:lb_carousel') {
      $form_key = isset($form['block_form']) ? 'block_form' : 'settings';
      $form[$form_key]['block_form']['#process'][] = '_small_y_carousels_override_block_item';
    }
  }
}

/**
 * Custom #process callback for the block form within the 'Carousel' block.
 *
 * Modifies the 'field_block_item' element by adding a custom #after_build callback.
 *
 * @param array $element
 *   The form element being processed.
 * @param \Drupal\Core\Form\FormStateInterface $form_state
 *   The current state of the form.
 *
 * @return array
 *   The processed form element.
 */
function _small_y_carousels_override_block_item(array &$element, FormStateInterface $form_state) {
  if (isset($element['field_block_item'])) {
    $element['field_block_item']['widget']['#after_build'][] = '_small_y_carousels_field_content_items_after_build';
  }
  return $element;
}

/**
 * Custom '#after_build' callback for 'Carousel items' field.
 *
 * Modifies the 'inline_entity_form' elements.
 *
 * @param array $element
 *   The form element being processed.
 * @param \Drupal\Core\Form\FormStateInterface $form_state
 *   The current state of the form.
 *
 * @return array
 *   The processed form element.
 */
function _small_y_carousels_field_content_items_after_build($element, FormStateInterface $form_state) {
  $created_entities = 0;
  $max_entities = 6;
  if (!empty($element['entities'])) {
    foreach ($element['entities'] as $key => $value) {
      if (is_numeric($key)) {
        $created_entities++;
      }
    }
  }

  if ($created_entities >= $max_entities) {
    $element['actions']['ief_add']['#access'] = FALSE;
    $element['cardinality_count']['#markup'] = Markup::create('<div class="ief-cardinality-count">' . t('You have added @max allowed content block entities.', ['@max' => $max_entities]) . '</div>');
  }

  return $element;
}