using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace AIProofread.Util
{
    public class User32Util
    {
        [DllImport("user32.dll")]
        public static extern bool GetWindowRect(IntPtr hWnd, ref RECT rect);

        [StructLayout(LayoutKind.Sequential)]
        public struct RECT
        {
            public int Left;
            public int Top;
            public int Right;
            public int Bottom;
        }

        // 引入 User32.dll 中的 SetParent 方法
        [DllImport("user32.dll", SetLastError = true)]
        public static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);

        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool SetForegroundWindow(IntPtr hWnd);

        #region 获取系统屏幕缩放比例
        public const int HORZRES = 8;
        public const int VERTRES = 10;
        public const int LOGPIXELSX = 88;
        public const int LOGPIXELSY = 90;
        public const int DESKTOPVERTRES = 117;
        public const int DESKTOPHORZRES = 118;

        [DllImport("user32.dll")]
        public static extern IntPtr GetDC(IntPtr ptr);
        [DllImport("gdi32.dll")]
        public static extern int GetDeviceCaps(
            IntPtr hdc, // handle to DC
            int nIndex // index of capability
        );
        [DllImport("user32.dll", EntryPoint = "ReleaseDC")]
        public static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDc);
        [DllImport("user32.dll")]
        public static extern IntPtr GetDesktopWindow();

        public static float GetSreenScale()
        {
            var hdc = GetDC(GetDesktopWindow());
            int nWidth = GetDeviceCaps(hdc, DESKTOPHORZRES);
            ReleaseDC(IntPtr.Zero, hdc);
            float f_Scale = (float)nWidth / (float)Screen.PrimaryScreen.Bounds.Width;
            return 1 / f_Scale;
        }
        #endregion
    }
}