--- /dev/null
+<?php
+
+namespace Drupal\action\Form;
+
+use Drupal\Core\Form\FormBase;
+use Drupal\Component\Utility\Crypt;
+use Drupal\Core\Action\ActionManager;
+use Drupal\Core\Form\FormStateInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a configuration form for configurable actions.
+ */
+class ActionAdminManageForm extends FormBase {
+
+ /**
+ * The action plugin manager.
+ *
+ * @var \Drupal\Core\Action\ActionManager
+ */
+ protected $manager;
+
+ /**
+ * Constructs a new ActionAdminManageForm.
+ *
+ * @param \Drupal\Core\Action\ActionManager $manager
+ * The action plugin manager.
+ */
+ public function __construct(ActionManager $manager) {
+ $this->manager = $manager;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function create(ContainerInterface $container) {
+ return new static(
+ $container->get('plugin.manager.action')
+ );
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getFormId() {
+ return 'action_admin_manage';
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function buildForm(array $form, FormStateInterface $form_state) {
+ $actions = [];
+ foreach ($this->manager->getDefinitions() as $id => $definition) {
+ if (is_subclass_of($definition['class'], '\Drupal\Core\Plugin\PluginFormInterface')) {
+ $key = Crypt::hashBase64($id);
+ $actions[$key] = $definition['label'] . '...';
+ }
+ }
+ $form['parent'] = [
+ '#type' => 'details',
+ '#title' => $this->t('Create an advanced action'),
+ '#attributes' => ['class' => ['container-inline']],
+ '#open' => TRUE,
+ ];
+ $form['parent']['action'] = [
+ '#type' => 'select',
+ '#title' => $this->t('Action'),
+ '#title_display' => 'invisible',
+ '#options' => $actions,
+ '#empty_option' => $this->t('Choose an advanced action'),
+ ];
+ $form['parent']['actions'] = [
+ '#type' => 'actions'
+ ];
+ $form['parent']['actions']['submit'] = [
+ '#type' => 'submit',
+ '#value' => $this->t('Create'),
+ ];
+ return $form;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function submitForm(array &$form, FormStateInterface $form_state) {
+ if ($form_state->getValue('action')) {
+ $form_state->setRedirect(
+ 'action.admin_add',
+ ['action_id' => $form_state->getValue('action')]
+ );
+ }
+ }
+
+}