Event listener (PSR-14 Events)

The are three event dispatchers used in the extension, two of them are used to assign data to the Fluid Template forms and the third one is used to customize mapping of home page constants with custom directives.

Event	Description
BeforeRenderingFirstStepViewEvent	Assign data to first form
BeforeRenderingSecondStepViewEvent	Assign data to second form
UpdateTemplateHPEvent	Custom directives for constants in home page template

Implementing an event listener in your extension

If you need to provide an event listener in your extension, you have to :

• register the listener in Configuration/Services.yaml

• create an event listener class

Configuration/Services.yaml

Register event listener as follow ...

services:
   Oktopuce\SiteGeneratorCustomized\EventListener\VariablesForFirstView:
      tags:
         - name: event.listener
         identifier: 'customizeFirstStep'
         event: Oktopuce\SiteGenerator\Wizard\Event\BeforeRenderingFirstStepViewEvent

   Oktopuce\SiteGeneratorCustomized\EventListener\VariablesForSecondView:
      tags:
         - name: event.listener
         identifier: 'customizeSecondtStep'
         event: Oktopuce\SiteGenerator\Wizard\Event\BeforeRenderingSecondStepViewEvent

   Oktopuce\SiteGeneratorCustomized\EventListener\UpdateTemplateHP:
      tags:
         - name: event.listener
           identifier: 'updateTemplateHP'
           event: Oktopuce\SiteGenerator\Wizard\Event\UpdateTemplateHPEvent

Classes/EventListener/VariablesForFirstView.php

... and assign needed variables in the listener with event dispatcher method addViewVariables(array $variables);

declare(strict_types=1);

namespace Oktopuce\SiteGeneratorCustomized\EventListener;

use TYPO3\CMS\Extbase\Persistence\QueryInterface;
use TYPO3\CMS\Extbase\Persistence\Generic\Typo3QuerySettings;
use TYPO3\CMS\Extbase\Domain\Repository\FrontendUserRepository;
use Oktopuce\SiteGenerator\Wizard\Event\BeforeRenderingFirstStepViewEvent;

class VariablesForFirstView
{
   /**
   * @var FrontendUserRepository
   */
   protected $frontendUserRepository = null;

   /**
   * @var Typo3QuerySettings
   */
   protected $typo3QuerySettings = null;

   /**
   * Class constructor
   *
   * @param PageRenderer $pageRenderer
   * @param Typo3QuerySettings $typo3QuerySettings
   */
   public function __construct(FrontendUserRepository $frontendUserRepository, Typo3QuerySettings $typo3QuerySettings)
   {
      $this->frontendUserRepository = $frontendUserRepository;
      $this->typo3QuerySettings = $typo3QuerySettings;
   }

   /**
   * __invoke
   *
   * @param  array $viewVariables
   * @return void
   */
   public function __invoke(BeforeRenderingFirstStepViewEvent $event): void
   {
      $this->typo3QuerySettings->setRespectStoragePage(false);
      $this->frontendUserRepository->setDefaultOrderings([
            'name' => QueryInterface::ORDER_ASCENDING
      ]);
      $this->frontendUserRepository->setDefaultQuerySettings($this->typo3QuerySettings);

      $feUsers = $this->frontendUserRepository->findAll();

      $event->addViewVariables(['feUsers' => $feUsers]);
   }
}

In this example, we assigned feUsers variable to first Fluid Template form.

Custom directives for constants in home page template

Sample customize directives for TypoScript constants mapping with some TypoScript directives in home page model template.

TypoScript constants in home page model template

plugin.tx_myplugin {
  settings {
      # ext=SiteGenerator; action=customAction; parameters=custom parameters
      forACustomAction = 515,516
  }
}

Classes/EventListener/UpdateTemplateHP.php

declare(strict_types=1);

namespace Oktopuce\SiteGeneratorCustomized\EventListener;

use Oktopuce\SiteGenerator\Wizard\Event\UpdateTemplateHPEvent;

class UpdateTemplateHP
{
    /**
     * __invoke
     *
     * @param UpdateTemplateHPEvent $event
     * @return void
     */
    public function __invoke(UpdateTemplateHPEvent $event): void
    {
        $action = $event->getAction();
        if ($action == 'customAction') {
            $parameters = $event->getParameters();
            $value = $event->getValue();
            $dataMapping = $event->getFilteredMapping();
            $updatedValue = "params = $parameters - value = $value - dataMapping = " . implode(',', $dataMapping);

            $event->setUpdatedValue($updatedValue);
        }
    }
}

Tip

Have a look at TYPO3 documentation for more information on event listener.