view_mode_conditional_fields.module

<?php

/**
 * @file
 * Allows to disable field of entities on the forms.
 */

use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\field\Entity\FieldConfig;
use Drupal\block_content\Entity\BlockContent;
use Drupal\block_content\BlockContentForm;

/**
 * Implements hook_help().
 */
function view_mode_conditional_fields_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    // Main module help for the view_mode_conditional_fields module.
    case 'help.page.view_mode_conditional_fields':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('View Mode Conditional module provide settings to administrator to control fields visibility for block entity.') . '</p>';
      return $output;

    default:
  }
}

/**
 * Implements hook_form_BASE_FORM_ID_alter().
 *
 * Attach the settings block entity manage field, to control the visibility.
 */
function view_mode_conditional_fields_form_field_config_edit_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  if (isset($form['#entity']) && $form['#entity'] instanceof BlockContent) {
    $view_modes = \Drupal::entityQuery('entity_view_mode')
      ->condition('targetEntityType', 'block_content')
      ->execute();
    $view_modes['block_content.default'] = 'block_content.default';
    $options = [];
    foreach ($view_modes as $view_mode) {
      $expStr = explode(".", $view_mode);
      $options[$expStr[1]] = $expStr[1];
    }

    $field = $form_state->getFormObject()->getEntity();
    $form['third_party_settings']['view_mode_conditional_fields']['field_visibility_display'] = [
      '#type' => 'checkboxes',
      '#options' => $options,
      '#title' => t("View Mode Conditional Fields Settings"),
      '#description' => t("Field will be available on selected view mode. If no view mode selected then field will be available on form display's."),
      '#default_value' => $field->getThirdPartySetting('view_mode_conditional_fields', 'field_visibility_display'),
      '#weight' => -10,
    ];
    $form['#validate'][] = 'config_edit_form_validation';
  }
}

/**
 * Attaching settings to control visibility of fields on display.
 *
 * @param array $element
 *   The elements of the form.
 * @param \Drupal\Core\Form\FormStateInterface $form_state
 *   The current form state.
 * @param array $context
 *   The context.
 */
function view_mode_conditional_fields_field_widget_form_alter(array &$element, FormStateInterface $form_state, array $context) {
  $applicable_forms = [
    'layout_builder_add_block',
    'layout_builder_update_block',
  ];
  if ($form_state->getFormObject() instanceof BlockContentForm || in_array($form_state->getFormObject()->getFormId(), $applicable_forms)) {
    $field_definition = $context['items']->getFieldDefinition();
    if ($field_definition instanceof FieldConfig) {
      if ($field_definition->getThirdPartySetting('view_mode_conditional_fields', 'field_visibility_display')) {
        if (\Drupal::request()->query->get('element_parents')) {
          return TRUE;
        }

        $class_list = $field_definition->getThirdPartySetting('view_mode_conditional_fields', 'field_visibility_display');
        if (!empty($class_list) && is_array($class_list)) {
          $classes = '';
          foreach ($class_list as $item) {
            $classes .= ' block_content.' . $item;
          }

          $classes = "'" . $classes . " field-visibility-identifier'";
          $element['#prefix'] = "<div class=" . $classes . ">";
          $element['#suffix'] = "</div>";
        }
      }
    }
  }
}

/**
 * Implements hook_form_alter().
 */
function view_mode_conditional_fields_form_alter(&$form, FormStateInterface $form_state, $form_id) {
  $applicable_forms = [
    'layout_builder_add_block',
    'layout_builder_update_block',
  ];
  if ($form_state->getFormObject() instanceof BlockContentForm || in_array($form_id, $applicable_forms)) {
    $form['#attached']['library'][] = 'view_mode_conditional_fields/view_mode_conditional_fields.integration';
  }
}

/**
 * The configuration edit form validation.
 *
 * @param array $form
 *   The form.
 * @param \Drupal\Core\Form\FormStateInterface $form_state
 *   The current form state.
 */
function config_edit_form_validation(array &$form, FormStateInterface $form_state) {
  $field = $form_state->getFormObject()->getEntity();
  if (($field->get('required') == 1)) {
    if (!empty($field->get('third_party_settings')['view_mode_conditional_fields']['field_visibility_display'])) {
      $form_state->setErrorByName('third_party_settings', t('Required and View Mode Conditional Fields Settings both cant work together.'));
    }
  }
}