using System;
using System.Runtime.InteropServices;

namespace TProduct.WinFrmUI
{
    //检查屏幕比例
    public class PrimaryScreenSizeHelper
    {
        public static void CheckScale()
        {
            var scale_win7 = GetDpiX() / 96f;
            var scale_win10 = GetScaleX();
            var scale = scale_win7 > scale_win10 ? scale_win7 : scale_win10;


            TProduct.WinFrmUI.GlobeParas.ScreenScale = scale;

            #region 修改注册表默认勾选DPI
            try
            {
                if (scale > 1.1)
                {
                    var path = @"SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers";
                    string content = "~ DPIUNAWARE";//~ PERPROCESSSYSTEMDPIFORCEOFF 勾选兼容性DPI  //~ DPIUNAWARE 系统

                    var regeditName = System.Windows.Forms.Application.ExecutablePath;
                    var regeditKey = TProduct.Common.RegeditHelper.ReadRegeditKey(regeditName, path, TProduct.Model.eRegDomain.CurrentUser);
                    if (regeditKey == null || regeditKey.ToString() != "~ DPIUNAWARE")
                    {
                        TProduct.Common.RegeditHelper.WriteRegeditKey(content, regeditName, path, TProduct.Model.eRegDomain.CurrentUser);
                    }

                    TProduct.WinFrmUI.GlobeParas.IsNeedTip4ScreenScale = false;
                }
                else
                {
                    TProduct.WinFrmUI.GlobeParas.IsNeedTip4ScreenScale = false;
                }

            }
            catch
            {//修改失败表示需要在主界面上提示一下
                TProduct.WinFrmUI.GlobeParas.IsNeedTip4ScreenScale = true;
            }
            #endregion
        }



        #region Win32 API
        [DllImport("user32.dll")]
        static extern IntPtr GetDC(IntPtr ptr);
        [DllImport("gdi32.dll")]
        static extern int GetDeviceCaps(
       IntPtr hdc, // handle to DC  
       int nIndex // index of capability  
       );
        [DllImport("user32.dll", EntryPoint = "ReleaseDC")]
        static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDc);
        #endregion

        #region DeviceCaps常量
        const int HORZRES = 8;
        const int VERTRES = 10;
        const int LOGPIXELSX = 88;
        const int LOGPIXELSY = 90;
        const int DESKTOPVERTRES = 117;
        const int DESKTOPHORZRES = 118;
        #endregion

        #region 属性

        /// <summary>  
        /// 获取屏幕分辨率当前物理大小  
        /// </summary>  
        public static System.Drawing.Size WorkingArea
        {
            get
            {
                IntPtr hdc = GetDC(IntPtr.Zero);
                System.Drawing.Size size = new System.Drawing.Size();
                size.Width = GetDeviceCaps(hdc, HORZRES);
                size.Height = GetDeviceCaps(hdc, VERTRES);
                ReleaseDC(IntPtr.Zero, hdc);
                return size;
            }
        }
        /// <summary>  
        /// 当前系统DPI_X 大小 一般为96  
        /// </summary>  
        public static int GetDpiX()
        {

            IntPtr hdc = GetDC(IntPtr.Zero);
            int DpiX = GetDeviceCaps(hdc, LOGPIXELSX);
            ReleaseDC(IntPtr.Zero, hdc);
            return DpiX;

        }
        /// <summary>  
        /// 当前系统DPI_Y 大小 一般为96  
        /// </summary>  
        public static int DpiY
        {
            get
            {
                IntPtr hdc = GetDC(IntPtr.Zero);
                int DpiX = GetDeviceCaps(hdc, LOGPIXELSY);
                ReleaseDC(IntPtr.Zero, hdc);
                return DpiX;
            }
        }
        /// <summary>  
        /// 获取真实设置的桌面分辨率大小  
        /// </summary>  
        public static System.Drawing.Size DESKTOP
        {
            get
            {
                IntPtr hdc = GetDC(IntPtr.Zero);
                System.Drawing.Size size = new System.Drawing.Size();
                size.Width = GetDeviceCaps(hdc, DESKTOPHORZRES);
                size.Height = GetDeviceCaps(hdc, DESKTOPVERTRES);
                ReleaseDC(IntPtr.Zero, hdc);
                return size;
            }
        }

        /// <summary>  
        /// 获取宽度缩放百分比  
        /// </summary>  
        public static float GetScaleX()
        {

            IntPtr hdc = GetDC(IntPtr.Zero);
            int t = GetDeviceCaps(hdc, DESKTOPHORZRES);
            int d = GetDeviceCaps(hdc, HORZRES);
            float ScaleX = (float)GetDeviceCaps(hdc, DESKTOPHORZRES) / (float)GetDeviceCaps(hdc, HORZRES);
            ReleaseDC(IntPtr.Zero, hdc);
            return ScaleX;

        }
        /// <summary>  
        /// 获取高度缩放百分比  
        /// </summary>  
        public static float GetScaleY()
        {

            IntPtr hdc = GetDC(IntPtr.Zero);
            float ScaleY = (float)(float)GetDeviceCaps(hdc, DESKTOPVERTRES) / (float)GetDeviceCaps(hdc, VERTRES);
            ReleaseDC(IntPtr.Zero, hdc);
            return ScaleY;

        }




        #endregion
    }
}