CPU-Password-Generator/DWM.cs at master · backslashspace/CPU-Password-Generator · GitHub

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using System;
using System.Runtime.InteropServices;

internal static partial class DwmInterop
{
    internal static Boolean Initialized { get => _initialized; }
    private static Boolean _initialized = false;

    internal static Boolean Initialize()
    {
        if (_initialized) return false;

        Object regOutput = Microsoft.Win32.Registry.GetValue("HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion", "CurrentBuildNumber", null)!;

        if (regOutput == null) return false;
        if (regOutput is not String) return false;
        if (!Int32.TryParse((String)regOutput, out _windowsBuildNumber)) return false;
        if (_windowsBuildNumber < 0) return false;

        if (_windowsBuildNumber >= 18985) // windows 10 '20H1' or newer
        {
            _dwmDarkModeWindowAttribute = DWMWINDOWATTRIBUTE.DWMWA_USE_IMMERSIVE_DARK_MODE;
            _darkModeCompatibilityLevel = DWM_Dark_Mode_Compatibility_Level.IMMERSIVE_DARK_MODE;
        }
        else if (_windowsBuildNumber >= 17763)
        {
            _dwmDarkModeWindowAttribute = DWMWINDOWATTRIBUTE.DWMWA_USE_IMMERSIVE_DARK_MODE_BEFORE_18985_EQUAL_OR_AFTER_17763;
            _darkModeCompatibilityLevel = DWM_Dark_Mode_Compatibility_Level.IMMERSIVE_DARK_MODE_BEFORE_18985_EQUAL_OR_AFTER_17763;
        }
        else
        {
            _dwmDarkModeWindowAttribute = 0;
            _darkModeCompatibilityLevel = DWM_Dark_Mode_Compatibility_Level.NONE;
        }

        _initialized = true;
        return true;
    }

    /********************************************************************/

    [LibraryImport("dwmapi.dll", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.U4)]
    private static unsafe partial UInt32 DwmSetWindowAttribute(IntPtr hwnd, DWMWINDOWATTRIBUTE dwAttribute, UInt32* pvAttribute, UInt32 cbAttribute);

    /********************************************************************/

    /// <summary>
    /// Requires OS version 17763 or later
    /// </summary>
    /// <param name="hwnd"></param>
    /// <param name="darkMode"></param>
    /// <returns>HRESULT</returns>
    /// <exception cref="InvalidOperationException"></exception>
    internal static unsafe UInt32 SetTheme(IntPtr hwnd, Boolean darkMode)
    {
        if (!_initialized) throw new Exception("DwmInterop not initialized.");

        UInt32 expandedBoolean = *(UInt32*)&darkMode;

        return DwmSetWindowAttribute(hwnd, _dwmDarkModeWindowAttribute, &expandedBoolean, sizeof(UInt32));
    }

    /// <summary>
    /// Requires OS version 22000 or later
    /// </summary>
    /// <param name="hwnd"></param>
    /// <param name="COLORREF"></param>
    /// <returns>HRESULT</returns>
    /// <exception cref="Exception"></exception>
    internal static unsafe UInt32 SetCaptionColor(IntPtr hwnd, UInt32 COLORREF)
    {
        if (!_initialized) throw new Exception("DwmInterop not initialized.");

        return DwmSetWindowAttribute(hwnd, DWMWINDOWATTRIBUTE.DWMWA_CAPTION_COLOR, &COLORREF, sizeof(UInt32));
    }

    /// <summary>
    /// Requires OS version 22000 or later
    /// </summary>
    /// <param name="hwnd"></param>
    /// <param name="COLORREF"></param>
    /// <returns>HRESULT</returns>
    /// <exception cref="Exception"></exception>
    internal static unsafe UInt32 SetBorderColor(IntPtr hwnd, UInt32 COLORREF)
    {
        if (!_initialized) throw new Exception("DwmInterop not initialized.");

        return DwmSetWindowAttribute(hwnd, DWMWINDOWATTRIBUTE.DWMWA_BORDER_COLOR, &COLORREF, sizeof(UInt32));
    }

    /********************************************************************/

    internal static DWM_Dark_Mode_Compatibility_Level DarkModeCompatibilityLevel { get => _darkModeCompatibilityLevel; }
    private static DWM_Dark_Mode_Compatibility_Level _darkModeCompatibilityLevel;

    internal enum DWM_Dark_Mode_Compatibility_Level : Int32
    {
        NONE = 0,
        IMMERSIVE_DARK_MODE_BEFORE_18985_EQUAL_OR_AFTER_17763 = 1,
        IMMERSIVE_DARK_MODE = 2,
    }

    private static DWMWINDOWATTRIBUTE _dwmDarkModeWindowAttribute = 0;
    private enum DWMWINDOWATTRIBUTE : UInt32
    {
        DWMWA_USE_IMMERSIVE_DARK_MODE_BEFORE_18985_EQUAL_OR_AFTER_17763 = 19,
        DWMWA_USE_IMMERSIVE_DARK_MODE = 20,
        DWMWA_WINDOW_CORNER_PREFERENCE = 33,
        DWMWA_BORDER_COLOR = 34,
        DWMWA_CAPTION_COLOR = 35,
        DWMWA_TEXT_COLOR = 36
    }

    private static Int32 _windowsBuildNumber = -1;
}