WizardFormController.php

<?php

namespace Drupal\ctools\Controller;

use Drupal\Core\Controller\FormController;
use Drupal\Core\Form\FormBuilderInterface;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\ctools\Wizard\WizardFactoryInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpKernel\Controller\ArgumentResolverInterface;

/**
 * Wrapping controller for wizard forms that serve as the main page body.
 */
class WizardFormController extends FormController {
    
    /**
     * The class resolver.
     *
     * @var \Drupal\Core\DependencyInjection\ClassResolverInterface
     */
    protected $classResolver;
    
    /**
     * Tempstore Factory for keeping track of values in each step of the wizard.
     *
     * @var \Drupal\Core\TempStore\SharedTempStoreFactory
     */
    protected $tempstore;
    
    /**
     * The event dispatcher.
     *
     * @var \Symfony\Component\EventDispatcher\EventDispatcherInterface
     */
    protected $dispatcher;
    
    /**
     * @param \Symfony\Component\HttpKernel\Controller\ArgumentResolverInterface $argument_resolver
     *   The argument resolver.
     * @param \Drupal\Core\Form\FormBuilderInterface $form_builder
     *   The form builder.
     * @param \Drupal\ctools\Wizard\WizardFactoryInterface $wizard_factory
     *   The wizard factory.
     */
    public function __construct(ArgumentResolverInterface $argument_resolver, FormBuilderInterface $form_builder, WizardFactoryInterface $wizard_factory) {
        parent::__construct($argument_resolver, $form_builder);
        $this->wizardFactory = $wizard_factory;
    }
    
    /**
     * {@inheritdoc}
     */
    protected function getFormArgument(RouteMatchInterface $route_match) {
        return $route_match->getRouteObject()
            ->getDefault('_wizard');
    }
    
    /**
     * Wizards are not instantiated as simply as forms, so this method is unused.
     */
    protected function getFormObject(RouteMatchInterface $route_match, $form_arg) {
        if (!is_subclass_of($form_arg, '\\Drupal\\ctools\\Wizard\\FormWizardInterface')) {
            throw new \Exception("The _wizard default must reference a class instance of \\Drupal\\ctools\\Wizard\\FormWizardInterface.");
        }
        $parameters = $route_match->getParameters()
            ->all();
        $parameters += $form_arg::getParameters();
        $parameters['route_match'] = $route_match;
        return $this->wizardFactory
            ->createWizard($form_arg, $parameters);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getContentResult(Request $request, RouteMatchInterface $route_match) {
        $wizard = $this->getFormObject($route_match, $this->getFormArgument($route_match));
        $ajax = $request->attributes
            ->get('js') == 'ajax' ? TRUE : FALSE;
        return $this->wizardFactory
            ->getWizardForm($wizard, $request->attributes
            ->all(), $ajax);
    }

}