RCM/cNumericUpDown.cs

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

    [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")]
    public class cNumericUpDown : NativeWindow, IDisposable
    {
        #region Constants
        // numeric styles
        private const int UDS_WRAP = 1;
        private const int UDS_SETBUDDYINT = 2;
        private const int UDS_ALIGNRIGHT = 4;
        private const int UDS_ALIGNLEFT = 8;
        private const int UDS_AUTOBUDDY = 16;
        private const int UDS_ARROWKEYS = 32;
        private const int UDS_HORZ = 64;
        private const int UDS_NOTHOUSANDS = 128;
        // numeric messages
        private const int WM_USER = 0x0400;
        private const int UDM_SETRANGE = (WM_USER+101);
        private const int UDM_GETRANGE = (WM_USER+102);
        private const int UDM_SETPOS = (WM_USER+103);
        private const int UDM_GETPOS = (WM_USER+104);
        private const int UDM_SETBUDDY = (WM_USER+105);
        private const int UDM_GETBUDDY = (WM_USER+106);
        private const int UDM_SETACCEL = (WM_USER+107);
        private const int UDM_GETACCEL = (WM_USER+108);
        private const int UDM_SETBASE = (WM_USER+109);
        private const int UDM_GETBASE = (WM_USER+110);
        // messages
        private const int WM_MOUSEMOVE = 0x200;
        private const int WM_MOUSELEAVE = 0x2A3;
        private const int WM_LBUTTONDOWN = 0x201;
        private const int WM_LBUTTONUP = 0x202;
        private const int WM_MOUSEHOVER = 0x2A1;
        private const int WM_PAINT = 0xF;
        // mouse constants
        private const int SM_SWAPBUTTON = 23;
        private const int VK_LBUTTON = 0x1;
        private const int VK_RBUTTON = 0x2;
        // message handler
        private static IntPtr MSG_HANDLED = new IntPtr(1);
        #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;