--- /dev/null
+<?php
+
+namespace Drupal\pathauto;
+
+use Drupal\Core\Field\FieldItemListInterface;
+use Drupal\path\Plugin\Field\FieldWidget\PathWidget;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Url;
+
+/**
+ * Extends the core path widget.
+ */
+class PathautoWidget extends PathWidget {
+
+ /**
+ * {@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();
+
+ // Taxonomy terms do not have an actual fieldset for path settings.
+ // Merge in the defaults.
+ // @todo Impossible to do this in widget, use another solution
+ /*
+ $form['path'] += array(
+ '#type' => 'fieldset',
+ '#title' => $this->t('URL path settings'),
+ '#collapsible' => TRUE,
+ '#collapsed' => empty($form['path']['alias']),
+ '#group' => 'additional_settings',
+ '#attributes' => array(
+ 'class' => array('path-form'),
+ ),
+ '#access' => \Drupal::currentUser()->hasPermission('create url aliases') || \Drupal::currentUser()->hasPermission('administer url aliases'),
+ '#weight' => 30,
+ '#tree' => TRUE,
+ '#element_validate' => array('path_form_element_validate'),
+ );*/
+
+ $pattern = \Drupal::service('pathauto.generator')->getPatternByEntity($entity);
+ if (empty($pattern)) {
+ return $element;
+ }
+
+ if (\Drupal::currentUser()->hasPermission('administer pathauto')) {
+ $description = $this->t('Uncheck this to create a custom alias below. <a href="@admin_link">Configure URL alias patterns.</a>', ['@admin_link' => Url::fromRoute('entity.pathauto_pattern.collection')->toString()]);
+ }
+ else {
+ $description = $this->t('Uncheck this to create a custom alias below.');
+ }
+
+ $element['pathauto'] = array(
+ '#type' => 'checkbox',
+ '#title' => $this->t('Generate automatic URL alias'),
+ '#default_value' => $entity->path->pathauto,
+ '#description' => $description,
+ '#weight' => -1,
+ );
+
+ // Add JavaScript that will disable the path textfield when the automatic
+ // alias checkbox is checked.
+ $element['alias']['#states']['disabled']['input[name="path[' . $delta . '][pathauto]"]'] = array('checked' => TRUE);
+
+ // Override path.module's vertical tabs summary.
+ $element['alias']['#attached']['library'] = ['pathauto/widget'];
+
+ return $element;
+ }
+
+}