protected function getSortedIDs($data)
{
if (empty($data['GridFieldEditableColumns'])) {
return array();
}
$sortedIDs = array();
foreach ($data['GridFieldEditableColumns'] as $id => $recordData) {
$sortValue = $recordData[$this->sortField];
$sortedIDs[$sortValue] = $id;
}
ksort($sortedIDs);
return $sortedIDs;
}