react_block-8.x-1.x-dev/src/Plugin/Field/FieldWidget/ReactBlockOptions.php

<?php

namespace Drupal\react_block\Plugin\Field\FieldWidget;

use Drupal\Core\Entity\FieldableEntityInterface;
use Drupal\Core\Field\FieldDefinitionInterface;
use Drupal\Core\Field\FieldFilteredMarkup;
use Drupal\Core\Field\FieldItemListInterface;
use Drupal\Core\Field\WidgetBase;
use Drupal\Core\Form\FormStateInterface;

/**
 * A widget to input video URLs.
 *
 * @FieldWidget(
 *   id = "react_block_options",
 *   label = @Translation("React Blocks"),
 *   field_types = {
 *     "react_block"
 *   },
 * )
 */
class ReactBlockOptions extends WidgetBase {

  protected $column;

  /**
   * {@inheritdoc}
   */
  public function __construct($plugin_id, $plugin_definition, FieldDefinitionInterface $field_definition, array $settings, array $third_party_settings) {
    parent::__construct($plugin_id, $plugin_definition, $field_definition, $settings, $third_party_settings);
    $property_names = $this->fieldDefinition->getFieldStorageDefinition()->getPropertyNames();
    $this->column = $property_names[0];
  }

  /**
   * {@inheritdoc}
   */
  public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {

    $element['value']['#key_column'] = $this->column;

    $element['value'] = $element + [
      '#type' => 'select',
      '#options' => $this->getOptions($items->getEntity()),
      '#default_value' => isset($items[$delta]->value) ? $items[$delta]->value : NULL,
    ];

    return $element;
  }

  /**
   * Returns the array of options for the widget.
   *
   * @param \Drupal\Core\Entity\FieldableEntityInterface $entity
   *   The entity for which to return options.
   *
   * @return array
   *   The array of options for the widget.
   */
  protected function getOptions(FieldableEntityInterface $entity) {
    if (!isset($this->options)) {
      // Limit the settable options for the current user account.
      $options = $this->fieldDefinition
        ->getFieldStorageDefinition()
        ->getOptionsProvider($this->column, $entity)
        ->getSettableOptions(\Drupal::currentUser());

      // Add an empty option if the widget needs one.
      if ($empty_label = $this->getEmptyLabel()) {
        $options = ['_none' => $empty_label] + $options;
      }

      $module_handler = \Drupal::moduleHandler();
      $context = [
        'fieldDefinition' => $this->fieldDefinition,
        'entity' => $entity,
      ];
      $module_handler->alter('options_list', $options, $context);

      array_walk_recursive($options, [$this, 'sanitizeLabel']);
      $this->options = $options;
    }
    return $this->options;
  }

  /**
   * Sanitizes a string label to display as an option.
   *
   * @param string $label
   *   The label to sanitize.
   */
  protected function sanitizeLabel(&$label) {
    // Allow a limited set of HTML tags.
    $label = FieldFilteredMarkup::create($label);
  }

  /**
   * {@inheritdoc}
   */
  protected function getEmptyLabel() {
    return t('- None -');
  }

}