Feature: #97945 - PSR-14 AfterPageTreeItemsPreparedEvent

Description

A new PSR-14 event \TYPO3\CMS\Backend\Controller\Event\AfterPageTreeItemsPreparedEvent has been introduced which allows to modify prepared page tree items. It can also be used as a replacement for the now removed $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['TYPO3\CMS\Workspaces\Service\WorkspaceService']['hasPageRecordVersions'] and $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['TYPO3\CMS\Workspaces\Service\WorkspaceService']['fetchPagesWithVersionsInTable'] hooks.

The event is dispatched in the TreeController after the page tree items have been resolved and prepared. The event provides the current PSR-7 Request as well as the page tree items. All items contain the corresponding page record in the special _page key.

Example

Registration of the event in your extension's Services.yaml file:

MyVendor\MyPackage\Workspaces\MyEventListener:
  tags:
    - name: event.listener
      identifier: 'my-package/workspaces/modify-page-tree-items'

The corresponding event listener class:

use TYPO3\CMS\Backend\Controller\Event\AfterPageTreeItemsPreparedEvent;

final class MyEventListener
{
    public function __invoke(AfterPageTreeItemsPreparedEvent $event): void
    {
        $items = $event->getItems();
        foreach ($items as &$item) {
            // Setting special item for page with id 123
            if ($item['_page']['uid'] === 123) {
                $item['icon'] = 'my-special-icon';
            }
        }
        $event->setItems($items);
    }
}

Impact

It is now possible to modify the prepared page tree items before they are returned by the TreeController, using the new PSR-14 event AfterPageTreeItemsPreparedEvent.