Feature: #105649 - New PSR-14 CustomFileSelectorsEvent 

Description 

A new PSR-14 event \TYPO3\CMS\Backend\Form\Event\CustomFileSelectorsEvent has been added. It is dispatched in \TYPO3\CMS\Backend\Form\Container\FilesControlContainer during rendering of the selectors of relations to sys_file_references.

To modify the selectors to add files, the following methods are available:

• getSelectors(): Get all selectors
• setSelectors(): Set all selectors
• getJavascriptModules(): Get all JavaScript modules
• setJavascriptModules(): Set all JavaScript modules
• getTableName(): Get table name of the current record
• getFieldName(): Get field name of the element
• getDatabaseRow(): Get raw database row
• getFieldConfig(): Get TCA configuration of the current field
• getFileExtensionFilter(): Get the allowed & disallowed file extensions
• getFormFieldIdentifier(): Get DOM object-id used in the form

<?php

declare(strict_types=1);

namespace MyVendor\MyExtension\EventListener;

use TYPO3\CMS\Backend\Form\Event\CustomFileSelectorsEvent;
use TYPO3\CMS\Core\Attribute\AsEventListener;

#[AsEventListener(identifier: 'my-extension/custom-file-selector')]
final class CustomFileSelectorEventListener
{

    public function __construct(
        private CustomDamFileSelector $damFileSelector,
    ) {}

    public function __invoke(CustomFileSelectorsEvent $event): void
    {
        $result = $this->damFileSelector->renderFileSelector(
            $event->getFormFieldIdentifier(),
        );
        $event->setSelectors(array_merge(
            $event->getSelectors(),
            $result['control'],
        ));
        $event->setJavascriptModules(array_merge(
            $event->getJavascriptModules(),
            $result['javaScriptModule'],
        ));
    }
}

Impact 

It's now possible to modify the file selectors using the new PSR-14 event CustomFileSelectorsEvent. This is especially useful for integrating a DAM system.