using System;
using System.Runtime.InteropServices;

namespace HotelPms.Share.Windows.GraphicsApi
{
    /// <summary>
    /// 无锯齿
    /// </summary>
    public class RegionFormAPI
    {
        #region 消息
        public const int MF_REMOVE = 0x1000;

        public const int SC_RESTORE = 0xF120; //还原
        public const int SC_MOVE = 0xF010; //移动
        public const int SC_SIZE = 0xF000; //大小
        public const int SC_MINIMIZE = 0xF020; //最小化
        public const int SC_MAXIMIZE = 0xF030; //最大化
        public const int SC_CLOSE = 0xF060; //关闭 

        public const int WM_SYSCOMMAND = 0x0112;
        public const int WM_COMMAND = 0x0111;

        public const int GW_HWNDFIRST = 0;
        public const int GW_HWNDLAST = 1;
        public const int GW_HWNDNEXT = 2;
        public const int GW_HWNDPREV = 3;
        public const int GW_OWNER = 4;
        public const int GW_CHILD = 5;

        public const int WM_NCCALCSIZE = 0x83;
        public const int WM_WINDOWPOSCHANGING = 0x46;
        public const int WM_PAINT = 0xF;
        public const int WM_CREATE = 0x1;
        public const int WM_NCCREATE = 0x81;
        public const int WM_NCPAINT = 0x85;
        public const int WM_PRINT = 0x317;
        public const int WM_DESTROY = 0x2;
        public const int WM_SHOWWINDOW = 0x18;
        public const int WM_SHARED_MENU = 0x1E2;
        public const int HC_ACTION = 0;
        public const int WH_CALLWNDPROC = 4;
        public const int GWL_WNDPROC = -4;

        public const int WS_SYSMENU = 0x80000;
        public const int WS_SIZEBOX = 0x40000;

        public const int WS_MAXIMIZEBOX = 0x10000;

        public const int WS_MINIMIZEBOX = 0x20000;
        #endregion
        [StructLayout(LayoutKind.Sequential)]
        public struct Size
        {
            public Int32 cx;
            public Int32 cy;

            public Size(Int32 x, Int32 y)
            {
                cx = x;
                cy = y;
            }
        }

        [StructLayout(LayoutKind.Sequential, Pack = 1)]
        public struct BLENDFUNCTION
        {
            public byte BlendOp;
            public byte BlendFlags;
            public byte SourceConstantAlpha;
            public byte AlphaFormat;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct Point
        {
            public Int32 x;
            public Int32 y;

            public Point(Int32 x, Int32 y)
            {
                this.x = x;
                this.y = y;
            }
        }

        public const byte AC_SRC_OVER = 0;
        public const Int32 ULW_ALPHA = 2;
        public const byte AC_SRC_ALPHA = 1;

        [DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
        public static extern IntPtr CreateCompatibleDC(IntPtr hDC);

        [DllImport("user32.dll", ExactSpelling = true, SetLastError = true)]
        public static extern IntPtr GetDC(IntPtr hWnd);

        [DllImport("gdi32.dll", ExactSpelling = true)]
        public static extern IntPtr SelectObject(IntPtr hDC, IntPtr hObj);

        [DllImport("user32.dll", ExactSpelling = true)]
        public static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);

        [DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
        public static extern int DeleteDC(IntPtr hDC);

        [DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
        public static extern int DeleteObject(IntPtr hObj);

        [DllImport("user32.dll", ExactSpelling = true, SetLastError = true)]
        public static extern int UpdateLayeredWindow(IntPtr hwnd, IntPtr hdcDst, ref Point pptDst, ref Size psize, IntPtr hdcSrc, ref Point pptSrc, Int32 crKey, ref BLENDFUNCTION pblend, Int32 dwFlags);

        [DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
        public static extern IntPtr ExtCreateRegion(IntPtr lpXform, uint nCount, IntPtr rgnData);

        [DllImport("user32")]
        public static extern int SendMessage(IntPtr hwnd, int msg, int wp, int lp);
    }
}