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<?php
namespace Drupal\Core\Controller;
use Drupal\Core\DependencyInjection\DependencySerializationTrait;
use Drupal\Core\Form\FormBuilderInterface;
use Drupal\Core\Form\FormState;
use Drupal\Core\Routing\RouteMatchInterface;
use Symfony\Component\HttpFoundation\Request;
/**
* Common base class for form interstitial controllers.
*
* @todo Make this a trait in PHP 5.4.
*/
abstract class FormController {
use DependencySerializationTrait;
/**
* The controller resolver.
*
* @var \Drupal\Core\Controller\ControllerResolverInterface
*/
protected $controllerResolver;
/**
* The form builder.
*
* @var \Drupal\Core\Form\FormBuilderInterface
*/
protected $formBuilder;
/**
* Constructs a new \Drupal\Core\Controller\FormController object.
*
* @param \Drupal\Core\Controller\ControllerResolverInterface $controller_resolver
* The controller resolver.
* @param \Drupal\Core\Form\FormBuilderInterface $form_builder
* The form builder.
*/
public function __construct(ControllerResolverInterface $controller_resolver, FormBuilderInterface $form_builder) {
$this->controllerResolver = $controller_resolver;
$this->formBuilder = $form_builder;
}
/**
* Invokes the form and returns the result.
*
* @param \Symfony\Component\HttpFoundation\Request $request
* The request object.
* @param \Drupal\Core\Routing\RouteMatchInterface $route_match
* The route match.
*
* @return array
* The render array that results from invoking the controller.
*/
public function getContentResult(Request $request, RouteMatchInterface $route_match) {
$form_arg = $this->getFormArgument($route_match);
$form_object = $this->getFormObject($route_match, $form_arg);
// Add the form and form_state to trick the getArguments method of the
// controller resolver.
$form_state = new FormState();
$request->attributes->set('form', []);
$request->attributes->set('form_state', $form_state);
$args = $this->controllerResolver->getArguments($request, [$form_object, 'buildForm']);
$request->attributes->remove('form');
$request->attributes->remove('form_state');
// Remove $form and $form_state from the arguments, and re-index them.
unset($args[0], $args[1]);
$form_state->addBuildInfo('args', array_values($args));
return $this->formBuilder->buildForm($form_object, $form_state);
}
/**
* Extracts the form argument string from a request.
*
* Depending on the type of form the argument string may be stored in a
* different request attribute.
*
* One example of a route definition is given below.
* @code
* defaults:
* _form: Drupal\example\Form\ExampleForm
* @endcode
*
* @param \Drupal\Core\Routing\RouteMatchInterface $route_match
* The route match object from which to extract a form definition string.
*
* @return string
* The form definition string.
*/
abstract protected function getFormArgument(RouteMatchInterface $route_match);
/**
* Returns the object used to build the form.
*
* @param \Drupal\Core\Routing\RouteMatchInterface $route_match
* The route match.
* @param string $form_arg
* Either a class name or a service ID.
*
* @return \Drupal\Core\Form\FormInterface
* The form object to use.
*/
abstract protected function getFormObject(RouteMatchInterface $route_match, $form_arg);
}