acquia_commercemanager-8.x-1.122/modules/acm_sku/src/Plugin/Field/FieldWidget/SKUFieldWidget.php

<?php

namespace Drupal\acm_sku\Plugin\Field\FieldWidget;

use Drupal\Core\Field\FieldItemListInterface;
use Drupal\Core\Field\WidgetBase;
use Drupal\Core\Form\FormStateInterface;

/**
 * Plugin implementation of the 'sku_wiget' widget.
 *
 * @FieldWidget(
 *   id = "sku_widget",
 *   label = @Translation("SKU Reference Widget"),
 *   field_types = {
 *     "sku"
 *   }
 * )
 */
class SKUFieldWidget extends WidgetBase {

  /**
   * {@inheritdoc}
   */
  public static function defaultSettings() {
    return [
      'size' => 60,
    ] + parent::defaultSettings();
  }

  /**
   * {@inheritdoc}
   */
  public function settingsForm(array $form, FormStateInterface $form_state) {
    $elements = [];

    $elements['size'] = [
      '#type' => 'number',
      '#title' => t('Size of textfield'),
      '#default_value' => $this->getSetting('size'),
      '#required' => TRUE,
      '#min' => 1,
    ];

    return $elements;
  }

  /**
   * {@inheritdoc}
   */
  public function settingsSummary() {
    $summary = [];

    $summary[] = t('Textfield size: @size', ['@size' => $this->getSetting('size')]);

    return $summary;
  }

  /**
   * {@inheritdoc}
   */
  public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {
    $element['value'] = $element + [
      '#type' => 'textfield',
      '#default_value' => isset($items[$delta]->value) ? $items[$delta]->value : NULL,
      '#size' => $this->getSetting('size'),
      '#maxlength' => $this->getFieldSetting('max_length'),
    ];

    return $element;
  }

}