TYPO3 tx_form conditional skip steps - forms

Question

I using TYPO3 8 LTS and i want to extend the form.
Right now I am trying to add a condition in my form that skips all other steps and runs my finishers. In the documentation it is written that you have to use the afterInitializeCurrentPage function:
/**
* #param FormRuntime $formRuntime
* #param CompositeRenderableInterface $currentPage
* #param null|CompositeRenderableInterface $lastPage
* #param mixed $requestArguments submitted value of the element *before post processing*
* #return CompositeRenderableInterface
*/
public function afterInitializeCurrentPage(
FormRuntime $formRuntime,
CompositeRenderableInterface $currentPage,
CompositeRenderableInterface $lastPage = null,
array $requestArguments = []
): CompositeRenderableInterface {
if ($requestArguments['personalized'] === '0') {
// code here ...
}
return $currentPage;
}
My problem is i do not know how i execute the finishers out of this function..
i hope someone can give me a hint or something else..
[EDIT]
next problem is if i use the afterInitializeCurrentPage method i get an exception for other forms in my site:
Argument 2 passed to VENDOR\YourNamespace\YourClass::afterInitializeCurrentPage() must implement interface TYPO3\CMS\Form\Domain\Model\Renderable\CompositeRenderableInterface, null given, called in [..]/typo3/sysext/form/Classes/Domain/Runtime/FormRuntime.php on line 254
Many Thanks!

Answer 1

You can call the finisher Class Like below.
You need to add below line in ext_localconf.php file. like this
$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ext/form']['afterInitializeCurrentPage'][]
= \VENDOR\YourNamespace\Hooks\YourClass::class;
After added this function like below on path Classes/Hooks/YourClass.php.
<?php
namespace \VENDOR\YourNamespace\Hooks;
class YourClass
{
/**
* #param \TYPO3\CMS\Form\Domain\Runtime\FormRuntime $formRuntime
* #param \TYPO3\CMS\Form\Domain\Model\Renderable\CompositeRenderableInterface $currentPage
* #param null|\TYPO3\CMS\Form\Domain\Model\Renderable\CompositeRenderableInterface $lastPage
* #param mixed $elementValue submitted value of the element *before post processing*
* #return \TYPO3\CMS\Form\Domain\Model\Renderable\CompositeRenderableInterface
*/
public function afterInitializeCurrentPage(\TYPO3\CMS\Form\Domain\Runtime\FormRuntime $formRuntime, \TYPO3\CMS\Form\Domain\Model\Renderable\CompositeRenderableInterface $currentPage, \TYPO3\CMS\Form\Domain\Model\Renderable\CompositeRenderableInterface $lastPage = null, array $requestArguments = []): CompositeRenderableInterface
{
return $currentPage;
}
}