FormFlowHandler

BaseFormFlowHandler.php

namespace ...;

use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Form\Form;

abstract class BaseFormFlowHandler extends BaseFormHandler
{
    protected $step;
    protected $request;

    public function __construct($formType, $formFactory,$request)
    {
        $this->formType = $formType;
        $this->formFactory = $formFactory;
        $this->request = $request;
    }

    public function createForm($step, $formData = null, $groups = null)
    {
        $this->form = $this->formFactory->create($this->formType, $formData, [
            'step' => $step,
            'validation_groups' => $groups
        ]);

        $this->setCurrentStep($step);
    }

    public function setCurrentStep($step)
    {
        $this->step = $step;
    }

    public function getCurrentStep()
    {
        return $this->step;
    }

}

BaseFormHandler.php

use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Form\Form;


abstract class BaseFormHandler {

    protected $request;
    protected $form;

    public function __construct(Form $form, Request $request) {
        $this->request = $request;
        $this->form = $form;
    }

    public function getForm() {
        return $this->form;
    }
 
    public function process($entity = null) {
        
        if ($entity)
            $this->form->setData($entity);
        if ('POST' == $this->request->getMethod()) {
            $this->form->bindRequest($this->request);
            if ($this->form->isValid()) {
                $this->onSuccess();
                return true;
            }
        }
        return false;
    }

    public function onSuccess() {
    }
}

MyFlowFormHandler.php

class MyFlowFormHandler extends BaseFormFlowHandler 

MyFormType.php

[...]
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        switch ($options['step']) {
          case 1:
          [...]
        }
    }
    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array(
            [...]
            'step' => 1
        ));
    }
[...]