cadencii.Preference.btnDown_Click C# (CSharp) Method

        public void btnDown_Click( Object sender, EventArgs e )
        {
            int index = getUtausingersSelectedIndex();
#if DEBUG
            AppManager.debugWriteLine( "Preference.btnDown_Click; index=" + index );
#endif
            if ( 0 <= index && index + 1 < m_utau_singers.size() ) {
                SingerConfig buf = (SingerConfig)m_utau_singers.get( index ).clone();
                m_utau_singers.set( index, (SingerConfig)m_utau_singers.get( index + 1 ).clone() );
                m_utau_singers.set( index + 1, buf );
                UpdateUtausingerList();
                if (!listSingers.Items[index + 1].Selected) {
                    listSingers.SelectedIndices.Clear();
                    listSingers.Items[index + 1].Selected = true;
                }
            }
        }