public function getPossibleArtifactParents(Tracker $parent_tracker, PFUser $user, $limit, $offset)
{
$label = '';
$possible_parents = array();
$display_selector = true;
EventManager::instance()->processEvent(TRACKER_EVENT_ARTIFACT_PARENTS_SELECTOR, array('user' => $user, 'parent_tracker' => $parent_tracker, 'possible_parents' => &$possible_parents, 'label' => &$label, 'display_selector' => &$display_selector));
if (!$possible_parents) {
$label = $GLOBALS['Language']->getText('plugin_tracker_artifact', 'formelement_artifactlink_open_parent', array($parent_tracker->getName()));
$possible_parents = $this->artifact_factory->getPaginatedPossibleParentArtifactsUserCanView($user, $parent_tracker->getId(), $limit, $offset);
}
return array($label, $possible_parents, $display_selector);
}