[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FDragDropOperation](API\Runtime\SlateCore\Input\FDragDropOperation) > CreateDragDropOperation ( const [FPointerEvent](API\Runtime\SlateCore\Input\FPointerEvent) & MouseEvent, const [TArray](API\Runtime\Core\Containers\TArray)< FSceneOutlinerTreeItemPtr > & InTreeItems ) const