metatags_quick-4.0.x-dev/src/Plugin/field/widget/MetatagDefaultWidget.php

<?php

namespace Drupal\metatags_quick\Plugin\Field\FieldWidget;

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

/**
 * Plugin implementation of the 'metatags_quick_default' widget.
 *
 * @FieldWidget(
 *   id = "metatags_quick_default",
 *   label = @Translation("Meta tag"),
 *   field_types = {
 *     "metatags_quick"
 *   }
 * )
 */
class MetatagDefaultWidget extends WidgetBase {

  /**
   * {@inheritdoc}
   */
  public function settingsForm(array $form, FormStateInterface $form_state) {
    $element['placeholder'] = [
      '#type' => 'textfield',
      '#title' => $this->t('Placeholder'),
      '#default_value' => $this->getSetting('placeholder'),
      '#description' => $this->t('Text that will be shown inside the field until a value is entered. This hint is usually a sample value or a brief description of the expected format.'),
    ];

    return $element;
  }

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

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

    return $element;
  }

}