/**
* Create a tree states instance.
*
* @return TreeNodeStates
*/
public function getTreeNodeStates()
{
if (!isset($this->nodeStates)) {
$environment = $this->getEnvironment();
$sessionStorage = $environment->getSessionStorage();
$this->nodeStates = new TreeNodeStates($sessionStorage->get($this->getToggleId()), $this->determineParentsOfValues());
// Maybe it is not the best location to do this here.
if ($environment->getInputProvider()->getParameter('ptg') == 'all') {
// Save in session and reload.
$sessionStorage->set($this->getToggleId(), $this->nodeStates->setAllOpen($this->nodeStates->isAllOpen())->getStates());
$environment->getEventDispatcher()->dispatch(ContaoEvents::CONTROLLER_RELOAD, new ReloadEvent());
}
}
return $this->nodeStates;
}