layout_builder_backgrounds.module

<?php

/**
 * @file
 * Contains layout_builder_backgrounds.module.
 */

use Drupal\Core\Form\SubformState;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\layout_builder_backgrounds\Form\LayoutBuilderBackgroundsForm;

/**
 * Implements hook_form_FORM_ID_alter().
 *
 * Modify the configuration form for layout builder sections (layouts).
 */
function layout_builder_backgrounds_form_layout_builder_configure_section_alter(&$form, FormStateInterface $form_state) {
  $layout_builder_backgrounds_form_object = new LayoutBuilderBackgroundsForm();

  $section = $form_state->getFormObject()->getCurrentSection();

  $form['layout_builder_backgrounds'] = [];
  $subform_state = SubformState::createForSubform($form['layout_builder_backgrounds'], $form, $form_state);
  $subform_state->set('section', $section);
  $form['layout_builder_backgrounds'] = $layout_builder_backgrounds_form_object->buildForm($form['layout_builder_backgrounds'], $subform_state);

  $form['actions']['#weight'] = 100;
  array_unshift($form['#submit'], [$layout_builder_backgrounds_form_object, 'submitForm']);
}

/**
 * Implements hook_help().
 */
function layout_builder_backgrounds_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    // Main module help for the layout_builder_backgrounds module.
    case 'help.page.layout_builder_backgrounds':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('Adds a background field to Layout Builder layouts.') . '</p>';
      return $output;

    default:
  }
}