using System;
using System.Drawing;
using System.Runtime.InteropServices;

namespace Dongke.WinForm.Controls
{
    internal class NativeMethods
    {
        public const int WM_GETMINMAXINFO = 0x0024;
        public const int WM_NCHITTEST = 0x0084;
        public const int WM_NCACTIVATE = 0x0086;
        public const int WS_EX_NOACTIVATE = 0x08000000;

        public const int HTTRANSPARENT = -1;
        public const int HTLEFT = 10;
        public const int HTRIGHT = 11;
        public const int HTTOP = 12;
        public const int HTTOPLEFT = 13;
        public const int HTTOPRIGHT = 14;
        public const int HTBOTTOM = 15;
        public const int HTBOTTOMLEFT = 16;
        public const int HTBOTTOMRIGHT = 17;

        [StructLayout(LayoutKind.Sequential)]
        public struct MINMAXINFO
        {
            public Point reserved;
            public Size maxSize;
            public Point maxPosition;
            public Size minTrackSize;
            public Size maxTrackSize;
        }

        public static int HIWORD(int n)
        {
            return (n >> 16) & 0xffff;
        }

        public static int HIWORD(IntPtr n)
        {
            return HIWORD(unchecked((int)(long)n));
        }

        public static int LOWORD(int n)
        {
            return n & 0xffff;
        }

        public static int LOWORD(IntPtr n)
        {
            return LOWORD(unchecked((int)(long)n));
        }
    }
}