WizardEnhancer.php

<?php

namespace Drupal\ctools\Routing\Enhancer;

use Drupal\Core\Routing\EnhancerInterface;
use Drupal\Core\Routing\RouteObjectInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Route;

/**
 * Sets the request format onto the request object.
 */
class WizardEnhancer implements EnhancerInterface {
    
    /**
     * {@inheritdoc}
     */
    public function enhance(array $defaults, Request $request) {
        $route = $defaults[RouteObjectInterface::ROUTE_OBJECT];
        if (!$this->isApplicable($route)) {
            return $defaults;
        }
        if (!empty($defaults['_wizard'])) {
            $defaults['_controller'] = 'ctools.wizard.form:getContentResult';
        }
        if (!empty($defaults['_entity_wizard'])) {
            $defaults['_controller'] = 'ctools.wizard.entity.form:getContentResult';
        }
        return $defaults;
    }
    
    /**
     * Returns if current route use ctools default parameters.
     *
     * @param \Symfony\Component\Routing\Route $route
     *   The route to check.
     *
     * @return bool
     *   TRUE if the route use one of ctools route default parameters or FALSE.
     */
    public function isApplicable(Route $route) {
        return !$route->hasDefault('_controller') && ($route->hasDefault('_wizard') || $route->hasDefault('_entity_wizard'));
    }

}