--- /dev/null
+<?php
+
+namespace Drupal\layout_builder\Form;
+
+use Drupal\Component\Uuid\UuidInterface;
+use Drupal\Core\Block\BlockManagerInterface;
+use Drupal\Core\Block\BlockPluginInterface;
+use Drupal\Core\DependencyInjection\ClassResolverInterface;
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Form\SubformState;
+use Drupal\Core\Plugin\Context\ContextRepositoryInterface;
+use Drupal\Core\Plugin\ContextAwarePluginAssignmentTrait;
+use Drupal\Core\Plugin\ContextAwarePluginInterface;
+use Drupal\Core\Plugin\PluginFormFactoryInterface;
+use Drupal\Core\Plugin\PluginWithFormsInterface;
+use Drupal\layout_builder\Context\LayoutBuilderContextTrait;
+use Drupal\layout_builder\Controller\LayoutRebuildTrait;
+use Drupal\layout_builder\LayoutTempstoreRepositoryInterface;
+use Drupal\layout_builder\SectionComponent;
+use Drupal\layout_builder\SectionStorageInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a base form for configuring a block.
+ *
+ * @internal
+ */
+abstract class ConfigureBlockFormBase extends FormBase {
+
+ use AjaxFormHelperTrait;
+ use ContextAwarePluginAssignmentTrait;
+ use LayoutBuilderContextTrait;
+ use LayoutRebuildTrait;
+
+ /**
+ * The plugin being configured.
+ *
+ * @var \Drupal\Core\Block\BlockPluginInterface
+ */
+ protected $block;
+
+ /**
+ * The layout tempstore repository.
+ *
+ * @var \Drupal\layout_builder\LayoutTempstoreRepositoryInterface
+ */
+ protected $layoutTempstoreRepository;
+
+ /**
+ * The block manager.
+ *
+ * @var \Drupal\Core\Block\BlockManagerInterface
+ */
+ protected $blockManager;
+
+ /**
+ * The UUID generator.
+ *
+ * @var \Drupal\Component\Uuid\UuidInterface
+ */
+ protected $uuidGenerator;
+
+ /**
+ * The plugin form manager.
+ *
+ * @var \Drupal\Core\Plugin\PluginFormFactoryInterface
+ */
+ protected $pluginFormFactory;
+
+ /**
+ * The field delta.
+ *
+ * @var int
+ */
+ protected $delta;
+
+ /**
+ * The current region.
+ *
+ * @var string
+ */
+ protected $region;
+
+ /**
+ * The UUID of the component.
+ *
+ * @var string
+ */
+ protected $uuid;
+
+ /**
+ * The section storage.
+ *
+ * @var \Drupal\layout_builder\SectionStorageInterface
+ */
+ protected $sectionStorage;
+
+ /**
+ * Constructs a new block form.
+ *
+ * @param \Drupal\layout_builder\LayoutTempstoreRepositoryInterface $layout_tempstore_repository
+ * The layout tempstore repository.
+ * @param \Drupal\Core\Plugin\Context\ContextRepositoryInterface $context_repository
+ * The context repository.
+ * @param \Drupal\Core\Block\BlockManagerInterface $block_manager
+ * The block manager.
+ * @param \Drupal\Component\Uuid\UuidInterface $uuid
+ * The UUID generator.
+ * @param \Drupal\Core\DependencyInjection\ClassResolverInterface $class_resolver
+ * The class resolver.
+ * @param \Drupal\Core\Plugin\PluginFormFactoryInterface $plugin_form_manager
+ * The plugin form manager.
+ */
+ public function __construct(LayoutTempstoreRepositoryInterface $layout_tempstore_repository, ContextRepositoryInterface $context_repository, BlockManagerInterface $block_manager, UuidInterface $uuid, ClassResolverInterface $class_resolver, PluginFormFactoryInterface $plugin_form_manager) {
+ $this->layoutTempstoreRepository = $layout_tempstore_repository;
+ $this->contextRepository = $context_repository;
+ $this->blockManager = $block_manager;
+ $this->uuidGenerator = $uuid;
+ $this->classResolver = $class_resolver;
+ $this->pluginFormFactory = $plugin_form_manager;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function create(ContainerInterface $container) {
+ return new static(
+ $container->get('layout_builder.tempstore_repository'),
+ $container->get('context.repository'),
+ $container->get('plugin.manager.block'),
+ $container->get('uuid'),
+ $container->get('class_resolver'),
+ $container->get('plugin_form.factory')
+ );
+ }
+
+ /**
+ * Builds the form for the block.
+ *
+ * @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.
+ * @param \Drupal\layout_builder\SectionStorageInterface $section_storage
+ * The section storage being configured.
+ * @param int $delta
+ * The delta of the section.
+ * @param \Drupal\layout_builder\SectionComponent $component
+ * The section component containing the block.
+ *
+ * @return array
+ * The form array.
+ */
+ public function doBuildForm(array $form, FormStateInterface $form_state, SectionStorageInterface $section_storage = NULL, $delta = NULL, SectionComponent $component = NULL) {
+ $this->sectionStorage = $section_storage;
+ $this->delta = $delta;
+ $this->uuid = $component->getUuid();
+ $this->block = $component->getPlugin();
+
+ $form_state->setTemporaryValue('gathered_contexts', $this->getAvailableContexts($section_storage));
+
+ // @todo Remove once https://www.drupal.org/node/2268787 is resolved.
+ $form_state->set('block_theme', $this->config('system.theme')->get('default'));
+
+ $form['#tree'] = TRUE;
+ $form['settings'] = [];
+ $subform_state = SubformState::createForSubform($form['settings'], $form, $form_state);
+ $form['settings'] = $this->getPluginForm($this->block)->buildConfigurationForm($form['settings'], $subform_state);
+
+ $form['actions']['submit'] = [
+ '#type' => 'submit',
+ '#value' => $this->submitLabel(),
+ '#button_type' => 'primary',
+ ];
+ if ($this->isAjax()) {
+ $form['actions']['submit']['#ajax']['callback'] = '::ajaxSubmit';
+ }
+
+ return $form;
+ }
+
+ /**
+ * Returns the label for the submit button.
+ *
+ * @return string
+ * Submit label.
+ */
+ abstract protected function submitLabel();
+
+ /**
+ * {@inheritdoc}
+ */
+ public function validateForm(array &$form, FormStateInterface $form_state) {
+ $subform_state = SubformState::createForSubform($form['settings'], $form, $form_state);
+ $this->getPluginForm($this->block)->validateConfigurationForm($form['settings'], $subform_state);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function submitForm(array &$form, FormStateInterface $form_state) {
+ // Call the plugin submit handler.
+ $subform_state = SubformState::createForSubform($form['settings'], $form, $form_state);
+ $this->getPluginForm($this->block)->submitConfigurationForm($form, $subform_state);
+
+ // If this block is context-aware, set the context mapping.
+ if ($this->block instanceof ContextAwarePluginInterface) {
+ $this->block->setContextMapping($subform_state->getValue('context_mapping', []));
+ }
+
+ $configuration = $this->block->getConfiguration();
+
+ $section = $this->sectionStorage->getSection($this->delta);
+ $section->getComponent($this->uuid)->setConfiguration($configuration);
+
+ $this->layoutTempstoreRepository->set($this->sectionStorage);
+ $form_state->setRedirectUrl($this->sectionStorage->getLayoutBuilderUrl());
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function successfulAjaxSubmit(array $form, FormStateInterface $form_state) {
+ return $this->rebuildAndClose($this->sectionStorage);
+ }
+
+ /**
+ * Retrieves the plugin form for a given block.
+ *
+ * @param \Drupal\Core\Block\BlockPluginInterface $block
+ * The block plugin.
+ *
+ * @return \Drupal\Core\Plugin\PluginFormInterface
+ * The plugin form for the block.
+ */
+ protected function getPluginForm(BlockPluginInterface $block) {
+ if ($block instanceof PluginWithFormsInterface) {
+ return $this->pluginFormFactory->createInstance($block, 'configure');
+ }
+ return $block;
+ }
+
+}