using System;

 using System.Drawing;

 using System.Runtime.InteropServices;

 namespace Aga.Controls.Tree

 {

     internal static class NativeMethods

     {

         public const int DCX_WINDOW = 0x01;

         public const int DCX_CACHE = 0x02;

         public const int DCX_NORESETATTRS = 0x04;

         public const int DCX_CLIPCHILDREN = 0x08;

         public const int DCX_CLIPSIBLINGS = 0x10;

         public const int DCX_PARENTCLIP = 0x20;

         public const int DCX_EXCLUDERGN = 0x40;

         public const int DCX_INTERSECTRGN = 0x80;

         public const int DCX_EXCLUDEUPDATE = 0x100;

         public const int DCX_INTERSECTUPDATE = 0x200;

         public const int DCX_LOCKWINDOWUPDATE = 0x400;

         public const int DCX_VALIDATE = 0x200000;

         public const int WM_THEMECHANGED = 0x031A;

         public const int WM_NCPAINT = 0x85;

         public const int WM_NCCALCSIZE = 0x83;

         public const int WS_BORDER = 0x800000;

         public const int WS_EX_CLIENTEDGE = 0x200;

         public const int WVR_HREDRAW = 0x100;

         public const int WVR_VREDRAW = 0x200;

         public const int WVR_REDRAW = (WVR_HREDRAW | WVR_VREDRAW);

         [StructLayout(LayoutKind.Sequential)]

         public struct NCCALCSIZE_PARAMS

         {

             public RECT rgrc0, rgrc1, rgrc2;

             public IntPtr lppos;

         }

         [StructLayout(LayoutKind.Sequential)]

         public struct RECT

         {

             public int Left;

             public int Top;

             public int Right;

             public int Bottom;

             public static RECT FromRectangle(Rectangle rectangle)

             {

                 RECT result = new RECT();

                 result.Left = rectangle.Left;

                 result.Top = rectangle.Top;

                 result.Right = rectangle.Right;

                 result.Bottom = rectangle.Bottom;

                 return result;

             }

             public Rectangle ToRectangle()

             {

                 return new Rectangle(Left, Top, Right - Left, Bottom - Top);

             }

         }

         [DllImport("user32.dll", SetLastError = true)]

         public static extern IntPtr GetDCEx(IntPtr hWnd, IntPtr hrgnClip, int flags);

         [DllImport("user32.dll")]

         public static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);

         [DllImport("user32.dll")]

         public static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);

     }

 }