using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Drawing;

namespace ICSharpCode.WinFormsUI.Controls
{
    internal class NativeMethods
    {
        internal const int WM_PAINT = 0xF;

        internal const int VK_LBUTTON = 0x1;
        internal const int VK_RBUTTON = 0x2;

        internal const int SB_CTL = 2;
        internal const int SIF_ALL = (0x0001 | 0x0002 | 0x0004 | 0x0010);

        internal const int WHEEL_DELTA = 120;

        // basically it's constant now, but could be changed later by MS
        internal const int WHEEL_MAX_DELTA = 120;

        [DllImport("user32.dll", ExactSpelling = true, CharSet = CharSet.Auto)]
        public static extern bool GetScrollInfo(HandleRef hWnd, int fnBar, NativeMethods.Scrollinfo si);

        [DllImport("user32.dll", ExactSpelling = true, CharSet = CharSet.Auto)]
        public static extern int SetScrollInfo(HandleRef hWnd, int fnBar, NativeMethods.Scrollinfo si, bool redraw);

        private const int TCM_FIRST = 0x1300;
        public const int TCM_GETITEMRECT = (TCM_FIRST + 10);

        public static readonly IntPtr TRUE = new IntPtr(1);

        [StructLayout(LayoutKind.Sequential)]
        public 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;
            internal int Reserved8;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct RECT
        {
            internal RECT(int X, int Y, int Width, int Height)
            {
                this.Left = X;
                this.Top = Y;
                this.Right = Width;
                this.Bottom = Height;
            }
            internal int Left;
            internal int Top;
            internal int Right;
            internal int Bottom;
        }

        [StructLayout(LayoutKind.Sequential)]
        public class Scrollinfo
        {
            public int fMask;
            public int nMin;
            public int nMax;
            public int nPage;
            public int nPos;
            public int cbSize;
            public int nTrackPos;

            public Scrollinfo()
            {
                cbSize = Marshal.SizeOf(typeof(Scrollinfo));
            }

            public Scrollinfo(int mask, int min, int max, int page, int pos) : this()
            {
                fMask = mask;
                nMin = min;
                nMax = max;
                nPage = page;
                nPos = pos;
            }
        }

        [DllImport("user32.dll")]
        public static extern IntPtr FindWindowEx(
            IntPtr hwndParent,
            IntPtr hwndChildAfter,
            string lpszClass,
            string lpszWindow);

        [DllImport("user32.dll")]
        public static extern IntPtr BeginPaint(IntPtr hWnd, ref PAINTSTRUCT ps);

        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool EndPaint(IntPtr hWnd, ref PAINTSTRUCT ps);

        [DllImport("user32.dll")]
        public static extern short GetKeyState(int nVirtKey);

        [DllImport("user32.dll")]
        public static extern IntPtr SendMessage(
            IntPtr hWnd, int Msg, int wParam, ref RECT lParam);

        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool GetCursorPos(ref Point lpPoint);

        [DllImport("user32.dll")]
        public extern static int OffsetRect(ref RECT lpRect, int x, int y);

        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool PtInRect([In] ref RECT lprc, Point pt);

        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool GetWindowRect(IntPtr hWnd, ref RECT lpRect);

        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool GetClientRect(IntPtr hWnd, ref RECT r);

        [DllImport("User32.dll", CharSet = CharSet.Auto)]
        public static extern bool IsWindowVisible(IntPtr hwnd);

        [DllImport("user32.dll")]
        public static extern int SendMessage(IntPtr wnd,int msg,bool param,int lparam);
    }
}