private void OnHolderRemoved(DragHolder inHolder, DragObject inObject)
{
ExpressionPiece piece = inObject.GetComponent <ExpressionPiece>();
if (Expression[PieceIndex] == piece)
{
Expression[PieceIndex] = null;
}
}
private void OnHolderAdded(DragHolder inHolder, DragObject inObject)
{
ExpressionPiece piece = inObject.GetComponent <ExpressionPiece>();
Expression[PieceIndex] = piece;
}