public void OnDirtied() { Dirtied?.Invoke(this, EventArgs.Empty); }
private void Melody_FieldChanged(Duration delta) => Dirtied?.Invoke(delta);
private void MeterSignatures_FieldChanged(Duration delta) => Dirtied?.Invoke(delta);
private void Staffs_FieldChanged(Duration delta) => Dirtied?.Invoke(delta);