ConfigureSectionForm.php

<?php

namespace Drupal\layout_builder\Form;

use Drupal\Core\Ajax\AjaxFormHelperTrait;
use Drupal\Core\Form\FormBase;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Form\SubformState;
use Drupal\Core\Layout\LayoutInterface;
use Drupal\Core\Plugin\PluginFormFactoryInterface;
use Drupal\Core\Plugin\PluginFormInterface;
use Drupal\Core\Plugin\PluginWithFormsInterface;
use Drupal\layout_builder\Controller\LayoutRebuildTrait;
use Drupal\layout_builder\LayoutBuilderHighlightTrait;
use Drupal\layout_builder\LayoutTempstoreRepositoryInterface;
use Drupal\layout_builder\Section;
use Drupal\layout_builder\SectionStorageInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Provides a form for configuring a layout section.
 *
 * @internal
 *   Form classes are internal.
 */
class ConfigureSectionForm extends FormBase {
    use AjaxFormHelperTrait;
    use LayoutBuilderHighlightTrait;
    use LayoutRebuildTrait;
    
    /**
     * The layout tempstore repository.
     *
     * @var \Drupal\layout_builder\LayoutTempstoreRepositoryInterface
     */
    protected $layoutTempstoreRepository;
    
    /**
     * The plugin being configured.
     *
     * @var \Drupal\Core\Layout\LayoutInterface|\Drupal\Core\Plugin\PluginFormInterface
     */
    protected $layout;
    
    /**
     * The plugin form manager.
     *
     * @var \Drupal\Core\Plugin\PluginFormFactoryInterface
     */
    protected $pluginFormFactory;
    
    /**
     * The section storage.
     *
     * @var \Drupal\layout_builder\SectionStorageInterface
     */
    protected $sectionStorage;
    
    /**
     * The field delta.
     *
     * @var int
     */
    protected $delta;
    
    /**
     * Indicates whether the section is being added or updated.
     *
     * @var bool
     */
    protected $isUpdate;
    
    /**
     * Constructs a new ConfigureSectionForm.
     *
     * @param \Drupal\layout_builder\LayoutTempstoreRepositoryInterface $layout_tempstore_repository
     *   The layout tempstore repository.
     * @param \Drupal\Core\Plugin\PluginFormFactoryInterface $plugin_form_manager
     *   The plugin form manager.
     */
    public function __construct(LayoutTempstoreRepositoryInterface $layout_tempstore_repository, PluginFormFactoryInterface $plugin_form_manager) {
        $this->layoutTempstoreRepository = $layout_tempstore_repository;
        $this->pluginFormFactory = $plugin_form_manager;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('layout_builder.tempstore_repository'), $container->get('plugin_form.factory'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFormId() {
        return 'layout_builder_configure_section';
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildForm(array $form, FormStateInterface $form_state, SectionStorageInterface $section_storage = NULL, $delta = NULL, $plugin_id = NULL) {
        $this->sectionStorage = $section_storage;
        $this->delta = $delta;
        $this->isUpdate = is_null($plugin_id);
        if ($this->isUpdate) {
            $section = $this->sectionStorage
                ->getSection($this->delta);
            if ($label = $section->getLayoutSettings()['label']) {
                $form['#title'] = $this->t('Configure @section', [
                    '@section' => $label,
                ]);
            }
        }
        else {
            $section = new Section($plugin_id);
        }
        $this->layout = $section->getLayout();
        $form['#tree'] = TRUE;
        $form['layout_settings'] = [];
        $subform_state = SubformState::createForSubform($form['layout_settings'], $form, $form_state);
        $form['layout_settings'] = $this->getPluginForm($this->layout)
            ->buildConfigurationForm($form['layout_settings'], $subform_state);
        $form['actions']['submit'] = [
            '#type' => 'submit',
            '#value' => $this->isUpdate ? $this->t('Update') : $this->t('Add section'),
            '#button_type' => 'primary',
        ];
        if ($this->isAjax()) {
            $form['actions']['submit']['#ajax']['callback'] = '::ajaxSubmit';
        }
        $target_highlight_id = $this->isUpdate ? $this->sectionUpdateHighlightId($delta) : $this->sectionAddHighlightId($delta);
        $form['#attributes']['data-layout-builder-target-highlight-id'] = $target_highlight_id;
        // Mark this as an administrative page for JavaScript ("Back to site" link).
        $form['#attached']['drupalSettings']['path']['currentPathIsAdmin'] = TRUE;
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    public function validateForm(array &$form, FormStateInterface $form_state) {
        $subform_state = SubformState::createForSubform($form['layout_settings'], $form, $form_state);
        $this->getPluginForm($this->layout)
            ->validateConfigurationForm($form['layout_settings'], $subform_state);
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
        // Call the plugin submit handler.
        $subform_state = SubformState::createForSubform($form['layout_settings'], $form, $form_state);
        $this->getPluginForm($this->layout)
            ->submitConfigurationForm($form['layout_settings'], $subform_state);
        $plugin_id = $this->layout
            ->getPluginId();
        $configuration = $this->layout
            ->getConfiguration();
        if ($this->isUpdate) {
            $this->sectionStorage
                ->getSection($this->delta)
                ->setLayoutSettings($configuration);
        }
        else {
            $this->sectionStorage
                ->insertSection($this->delta, new Section($plugin_id, $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 layout.
     *
     * @param \Drupal\Core\Layout\LayoutInterface $layout
     *   The layout plugin.
     *
     * @return \Drupal\Core\Plugin\PluginFormInterface
     *   The plugin form for the layout.
     */
    protected function getPluginForm(LayoutInterface $layout) {
        if ($layout instanceof PluginWithFormsInterface) {
            return $this->pluginFormFactory
                ->createInstance($layout, 'configure');
        }
        if ($layout instanceof PluginFormInterface) {
            return $layout;
        }
        throw new \InvalidArgumentException(sprintf('The "%s" layout does not provide a configuration form', $layout->getPluginId()));
    }
    
    /**
     * Retrieve the section storage property.
     *
     * @return \Drupal\layout_builder\SectionStorageInterface
     *   The section storage for the current form.
     */
    public function getSectionStorage() {
        return $this->sectionStorage;
    }

}