public void RemoveEventListener(UnityDragAndDropHook.DroppedFilesEvent droppedFilesEvent)
 {
     hook.OnDroppedFiles -= droppedFilesEvent;
 }
 public void AddEventListener(UnityDragAndDropHook.DroppedFilesEvent droppedFilesEvent)
 {
     hook.OnDroppedFiles += droppedFilesEvent;
 }