work_time-1.0.x-dev/src/Plugin/Field/FieldWidget/WorkTimeWidget.php

<?php

namespace Drupal\work_time\Plugin\Field\FieldWidget;

use Drupal\Core\Datetime\DrupalDateTime;
use Drupal\Core\Field\FieldItemListInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\datetime_range\Plugin\Field\FieldWidget\DateRangeDefaultWidget;

/**
 * Defines the 'work_time' field widget.
 *
 * @FieldWidget(
 *   id = "work_time",
 *   label = @Translation("Work Time"),
 *   field_types = {"daterange"},
 * )
 */
class WorkTimeWidget extends DateRangeDefaultWidget {

  /**
   * {@inheritdoc}
   */
  public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {
    $element = parent::formElement($items, $delta, $element, $form, $form_state);
    $entity = $items->getEntity();
    if (!empty($entity)) {
      $workTimeStorage = \Drupal::entityTypeManager()->getStorage('work_time');
      $query = $workTimeStorage->getQuery()
        ->condition('entity_id', $entity->id());
      $workTimes = $query->execute();
      if (!empty($workTimes)) {
        $workTimes = array_values($workTimes);
        if (!empty($workTimeId = $workTimes[$delta])) {
          $workTime = $workTimeStorage->load($workTimeId);
          $start = $workTime->get('created') ? date('Y-m-d H:i:s', $workTime->get('created')->value) : NULL;
          $stop = $workTime->get('stopped') ? date('Y-m-d H:i:s', $workTime->get('stopped')->value) : NULL;
          if ($start) {
            $element["value"]["#default_value"] = new DrupalDateTime($start);
          }
          if ($stop) {
            $element["end_value"]["#default_value"] = new DrupalDateTime($stop);
          }
        }

      }
    }
    return $element;
  }

}