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<?php
/**
 * @file
 * Contains \Drupal\telephone\Plugin\Field\FieldWidget\TelephoneDefaultWidget.
 */
namespace Drupal\telephone\Plugin\Field\FieldWidget;
use Drupal\Core\Field\FieldItemListInterface;
use Drupal\Core\Field\WidgetBase;
use Drupal\Core\Form\FormStateInterface;
/**
 * Plugin implementation of the 'telephone_default' widget.
 *
 * @FieldWidget(
 *   id = "telephone_default",
 *   label = @Translation("Telephone number"),
 *   field_types = {
 *     "telephone"
 *   }
 * )
 */
class TelephoneDefaultWidget extends WidgetBase {
  /**
   * {@inheritdoc}
   */
  public static function defaultSettings() {
    return array(
      'placeholder' => '',
    ) + parent::defaultSettings();
  }
  /**
   * {@inheritdoc}
   */
  public function settingsForm(array $form, FormStateInterface $form_state) {
    $element['placeholder'] = array(
      '#type' => 'textfield',
      '#title' => t('Placeholder'),
      '#default_value' => $this->getSetting('placeholder'),
      '#description' => 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 = array();
    $placeholder = $this->getSetting('placeholder');
    if (!empty($placeholder)) {
      $summary[] = t('Placeholder: @placeholder', array('@placeholder' => $placeholder));
    }
    else {
      $summary[] = t('No placeholder');
    }
    return $summary;
  }
  /**
   * {@inheritdoc}
   */
  public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {
    $element['value'] = $element + array(
      '#type' => 'tel',
      '#default_value' => isset($items[$delta]->value) ? $items[$delta]->value : NULL,
      '#placeholder' => $this->getSetting('placeholder'),
    );
    return $element;
  }
}