RCM/cComboBox.cs

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namespace RCM
{
    #region Directives
    using System;
    using System.Windows.Forms;
    using System.Runtime.InteropServices;
    using System.Drawing;
    using System.Text;
    #endregion

    [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")]
    public class cComboBox : NativeWindow, IDisposable
    {
        #region Constants
        // messages
        private const int WM_MOUSEMOVE = 0x200;
        private const int WM_MOUSELEAVE = 0x2A3;
        private const int WM_PAINT = 0xF;
        private const int WM_NCMOUSEMOVE = 0xA0;
        private const int WM_LBUTTONDOWN = 0x201;
        private const int WM_RBUTTONDOWN = 0x204;
        // combobox messages
        private const int CB_GETCOMBOBOXINFO = 0x164;
        // message handler
        private static IntPtr MSG_HANDLED = new IntPtr(1);
        #endregion

        #region Enums
        private enum COMBOBOXSTYLESTATES
        {
            CBXS_NORMAL = 1,
            CBXS_HOT = 2,
            CBXS_PRESSED = 3,
            CBXS_DISABLED = 4,
        };

        private enum ComboBoxButtonState
        {
            STATE_SYSTEM_NONE = 0,
            STATE_SYSTEM_INVISIBLE = 0x00008000,
            STATE_SYSTEM_PRESSED = 0x00000008
        }
        #endregion

        #region Structs
        [StructLayout(LayoutKind.Sequential)]
        private struct PAINTSTRUCT
        {
            internal IntPtr hdc;
            internal int fErase;
            internal RECT rcPaint;
            internal int fRestore;
            internal int fIncUpdate;
            internal int Reserved1;
            internal int Reserved2;
            internal int Reserved3;
            internal int Reserved4;
            internal int Reserved5;
            internal int Reserved6;
            internal int Reserved7;