commerce_shipping-8.x-2.0-rc2/src/Form/ShipmentAddModalForm.php

<?php

namespace Drupal\commerce_shipping\Form;

use Drupal\Core\Ajax\AjaxResponse;
use Drupal\Core\Ajax\RedirectCommand;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Url;

/**
 * Defines the add shipment modal form.
 */
class ShipmentAddModalForm extends ShipmentForm {

  /**
   * {@inheritdoc}
   */
  protected function actions(array $form, FormStateInterface $form_state) {
    $actions = parent::actions($form, $form_state);

    $actions['submit']['#ajax'] = [
      'callback' => '::ajaxSubmit',
    ];

    $order = $this->entity->getOrder();
    $actions['cancel'] = [
      '#type' => 'link',
      '#title' => $this->t('Cancel'),
      '#url' => $order->toUrl(),
      '#attributes' => [
        'class' => ['button', 'button--danger', 'dialog-cancel'],
      ],
    ];

    return $actions;
  }

  /**
   * {@inheritdoc}
   */
  public function save(array $form, FormStateInterface $form_state) {
    $return = parent::save($form, $form_state);
    $order = $this->entity->getOrder();
    $form_state->setRedirectUrl($order->toUrl());
    return $return;
  }

  /**
   * Submit form dialog #ajax callback.
   *
   * @param array $form
   *   An associative array containing the structure of the form.
   * @param \Drupal\Core\Form\FormStateInterface $form_state
   *   The current state of the form.
   *
   * @return \Drupal\Core\Ajax\AjaxResponse
   *   An AJAX response that display validation error messages or represents a
   *   successful submission.
   */
  public function ajaxSubmit(array $form, FormStateInterface $form_state) {
    if ($form_state->hasAnyErrors()) {
      $response = self::ajaxRefreshForm($form, $form_state);
    }
    else {
      $response = new AjaxResponse();
      $url = Url::fromRoute('<front>');
      $order = $this->entity->getOrder();
      if ($order) {
        $url = $order->toUrl();
      }
      $response->addCommand(new RedirectCommand($url->toString()));
    }
    return $response;
  }

}