drowl_paragraphs_bs-1.x-dev/modules/drowl_paragraphs_bs_styles_ui/drowl_paragraphs_bs_styles_ui.module

<?php

/**
 * @file
 * DROWL Paragraphs BS - Styles UI provides a hook for other modules to provide (a set of) CSS classes
 * plus a preview image, a title and description per style.
 */

/**
 * Returns an array of styles ui definitions.
 *
 * @return array
 *   The style definitions array in the defined format.
 */
function drowl_paragraphs_bs_styles_ui_definitions() {
  $definitions = [];

  // Get the icon path path prefix:
  // $iconPathPrefix = base_path() . \Drupal::service('extension.list.module')->getPath('drowl_paragraphs_bs_styles_ui');

  // The modules general definitions:
  // $definitions['boxStyleBlack'] = [
  //   'label' => t('Box Style: Black'),
  //   'classesString' => 'box-style box-style--black',
  //   'description' => t('Lorem ipsum dolar sit'),
  //   'iconPath' => $iconPathPrefix . '/images/icons/boxStyleBlack.svg',
  // ];

  // Allow to alter the list
  \Drupal::moduleHandler()->alter('drowl_paragraphs_bs_styles_ui_definitions', $definitions);

  return $definitions;
}

/**
 * Implements hook_field_widget_single_element_WIDGET_TYPE_form_alter.
 */
function drowl_paragraphs_bs_styles_ui_form_layout_paragraphs_component_form_alter(&$form, \Drupal\Core\Form\FormStateInterface $form_state, $form_id) : void {
  // Provide definitions:
  $form['#attached']['drupalSettings']['drowl_paragraphs_bs_styles_ui']['definitions'] = drowl_paragraphs_bs_styles_ui_definitions() ?: [];
  // Attach admin library:
  $form['#attached']['library'][] = 'drowl_paragraphs_bs_styles_ui/admin';
}