EmbeddedComponentForm.php

<?php

namespace Drupal\rules\Form;

use Drupal\Core\Form\FormInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\rules\Ui\RulesUiHandlerInterface;

/**
 * Components form, ready to be embedded in some other form.
 *
 * Note, that there is no SubformInterface or such in core (yet), thus we
 * implement FormInterface instead.
 */
class EmbeddedComponentForm implements FormInterface {
    
    /**
     * The RulesUI handler of the currently active UI.
     *
     * @var \Drupal\rules\Ui\RulesUiHandlerInterface
     */
    protected $rulesUiHandler;
    
    /**
     * Constructs the object.
     *
     * @param \Drupal\rules\Ui\RulesUiHandlerInterface $rules_ui_handler
     *   The UI handler of the edited component.
     */
    public function __construct(RulesUiHandlerInterface $rules_ui_handler) {
        $this->rulesUiHandler = $rules_ui_handler;
    }
    
    /**
     * Gets the form handler for the component's expression.
     *
     * @return \Drupal\rules\Form\Expression\ExpressionFormInterface|null
     *   The form handling object if there is one, NULL otherwise.
     */
    protected function getFormHandler() {
        return $this->rulesUiHandler
            ->getComponent()
            ->getExpression()
            ->getFormHandler();
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFormId() {
        return 'rules_embedded_component_' . $this->rulesUiHandler
            ->getPluginId();
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildForm(array $form, FormStateInterface $form_state) {
        $form['locked'] = $this->rulesUiHandler
            ->addLockInformation();
        return $this->getFormHandler()
            ->form($form, $form_state);
    }
    
    /**
     * {@inheritdoc}
     */
    public function validateForm(array &$form, FormStateInterface $form_state) {
        $this->rulesUiHandler
            ->validateLock($form, $form_state);
        $this->getFormHandler()
            ->validateForm($form, $form_state);
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
        $this->getFormHandler()
            ->submitForm($form, $form_state);
    }

}