--- /dev/null
+<?php
+
+namespace Drupal\views_ui\Form\Ajax;
+
+use Drupal\Component\Utility\SafeMarkup;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Url;
+use Drupal\views\ViewEntityInterface;
+use Drupal\views\ViewExecutable;
+
+/**
+ * Provides a rearrange form for Views handlers.
+ */
+class Rearrange extends ViewsFormBase {
+
+ /**
+ * Constructs a new Rearrange object.
+ */
+ public function __construct($type = NULL) {
+ $this->setType($type);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getFormKey() {
+ return 'rearrange';
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getForm(ViewEntityInterface $view, $display_id, $js, $type = NULL) {
+ $this->setType($type);
+ return parent::getForm($view, $display_id, $js);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getFormId() {
+ return 'views_ui_rearrange_form';
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function buildForm(array $form, FormStateInterface $form_state) {
+ $view = $form_state->get('view');
+ $display_id = $form_state->get('display_id');
+ $type = $form_state->get('type');
+
+ $types = ViewExecutable::getHandlerTypes();
+ $executable = $view->getExecutable();
+ if (!$executable->setDisplay($display_id)) {
+ $form['markup'] = ['#markup' => $this->t('Invalid display id @display', ['@display' => $display_id])];
+ return $form;
+ }
+ $display = &$executable->displayHandlers->get($display_id);
+ $form['#title'] = $this->t('Rearrange @type', ['@type' => $types[$type]['ltitle']]);
+ $form['#section'] = $display_id . 'rearrange-item';
+
+ if ($display->defaultableSections($types[$type]['plural'])) {
+ $section = $types[$type]['plural'];
+ $form_state->set('section', $section);
+ views_ui_standard_display_dropdown($form, $form_state, $section);
+ }
+
+ $count = 0;
+
+ // Get relationship labels
+ $relationships = [];
+ foreach ($display->getHandlers('relationship') as $id => $handler) {
+ $relationships[$id] = $handler->adminLabel();
+ }
+
+ $form['fields'] = [
+ '#type' => 'table',
+ '#header' => ['', $this->t('Weight'), $this->t('Remove')],
+ '#empty' => $this->t('No fields available.'),
+ '#tabledrag' => [
+ [
+ 'action' => 'order',
+ 'relationship' => 'sibling',
+ 'group' => 'weight',
+ ]
+ ],
+ '#tree' => TRUE,
+ '#prefix' => '<div class="scroll" data-drupal-views-scroll>',
+ '#suffix' => '</div>',
+ ];
+
+ foreach ($display->getOption($types[$type]['plural']) as $id => $field) {
+ $form['fields'][$id] = [];
+
+ $form['fields'][$id]['#attributes'] = ['class' => ['draggable'], 'id' => 'views-row-' . $id];
+
+ $handler = $display->getHandler($type, $id);
+ if ($handler) {
+ $name = $handler->adminLabel() . ' ' . $handler->adminSummary();
+ if (!empty($field['relationship']) && !empty($relationships[$field['relationship']])) {
+ $name = '(' . $relationships[$field['relationship']] . ') ' . $name;
+ }
+ $markup = $name;
+ }
+ else {
+ $name = $id;
+ $markup = $this->t('Broken field @id', ['@id' => $id]);
+ }
+ $form['fields'][$id]['name'] = ['#markup' => $markup];
+
+ $form['fields'][$id]['weight'] = [
+ '#type' => 'textfield',
+ '#default_value' => ++$count,
+ '#attributes' => ['class' => ['weight']],
+ '#title' => t('Weight for @title', ['@title' => $name]),
+ '#title_display' => 'invisible',
+ ];
+
+ $form['fields'][$id]['removed'] = [
+ '#type' => 'checkbox',
+ '#title' => t('Remove @title', ['@title' => $name]),
+ '#title_display' => 'invisible',
+ '#id' => 'views-removed-' . $id,
+ '#attributes' => ['class' => ['views-remove-checkbox']],
+ '#default_value' => 0,
+ '#suffix' => \Drupal::l(SafeMarkup::format('<span>@text</span>', ['@text' => $this->t('Remove')]),
+ Url::fromRoute('<none>', [], ['attributes' => [
+ 'id' => 'views-remove-link-' . $id,
+ 'class' => ['views-hidden', 'views-button-remove', 'views-remove-link'],
+ 'alt' => $this->t('Remove this item'),
+ 'title' => $this->t('Remove this item')],
+ ])
+ ),
+ ];
+ }
+
+ $view->getStandardButtons($form, $form_state, 'views_ui_rearrange_form');
+
+ return $form;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function submitForm(array &$form, FormStateInterface $form_state) {
+ $view = $form_state->get('view');
+ $display_id = $form_state->get('display_id');
+ $type = $form_state->get('type');
+
+ $types = ViewExecutable::getHandlerTypes();
+ $display = &$view->getExecutable()->displayHandlers->get($display_id);
+
+ $old_fields = $display->getOption($types[$type]['plural']);
+ $new_fields = $order = [];
+
+ // Make an array with the weights
+ foreach ($form_state->getValue('fields') as $field => $info) {
+ // add each value that is a field with a weight to our list, but only if
+ // it has had its 'removed' checkbox checked.
+ if (is_array($info) && isset($info['weight']) && empty($info['removed'])) {
+ $order[$field] = $info['weight'];
+ }
+ }
+
+ // Sort the array
+ asort($order);
+
+ // Create a new list of fields in the new order.
+ foreach (array_keys($order) as $field) {
+ $new_fields[$field] = $old_fields[$field];
+ }
+ $display->setOption($types[$type]['plural'], $new_fields);
+
+ // Store in cache
+ $view->cacheSet();
+ }
+
+}