Classic AddItemMenu 2025-03-22

    public class ItemListMenu : IMenu
    {
        private readonly int m_Serial;
        private static int m_NextSerial;

        int IMenu.Serial => m_Serial;

        int IMenu.EntryLength => Entries.Length;

        public string Question { get; }

        public ItemListEntry[] Entries { get; set; }

        public ItemListMenu(string question, ItemListEntry[] entries)
        {
            Question = question;
            Entries = entries;

            do
            {
                m_Serial = m_NextSerial++;
                m_Serial &= 0x7FFFFFFF;
            }
            while (m_Serial == 0);

            m_Serial = (int)((uint)m_Serial | 0x80000000);
        }

        public virtual void OnCancel(NetState state)
        { }

        public virtual void OnResponse(NetState state, int index)
        { }

        public void SendTo(NetState state)
        {
            state.AddMenu(this);
            state.Send(new DisplayItemListMenu(this));
        }
    }