Automatically register hook for checking UnsubmittableFormDefinition

[kftw]

To use unsubmittable Forms using Tollwerk\TwBase\Domain\Model\UnsubmittableFormDefinition, one has to register a hook for handling that in his own extension:

ext_localconf.php

$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ext/form'][] = \Path\To\YourClass:class;

YourClass.php

class YourClass {
   public function afterInitializeCurrentPage(FormRuntime $formRuntime, CompositeRenderableInterface $currentPage = null, CompositeRenderableInterface $lastPage = null, array $requestArguments = []): ?CompositeRenderableInterface
    {
       // Handle unsubmittable forms (filters forms etc.).
       // Important: This condition MUST always be called last inside this function
       if ($formRuntime->getFormDefinition() instanceof UnsubmittableFormDefinition) {
          return $formDefinition->getPageByIndex(0);
       }
    }
 }

Couldn't that be automatically handled by tw_base itself? I see that if you don't need that feature in your particular TYPO3 installation, registering and checking it anyway is a bit of overhead. But needing unsubmittable forms is such a common thing I think it could make sense to let tw_base handle that automatically.