QuickLook/QuickLook.Common/Helpers/OSThemeHelper.cs

// Copyright © 2017-2026 QL-Win Contributors
//
// This file is part of QuickLook program.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

using Microsoft.Win32;

namespace QuickLook.Common.Helpers;

public static class OSThemeHelper
{
    public static bool AppsUseDarkTheme()
    {
        var value = Registry.GetValue(
                    @"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize",
                    "AppsUseLightTheme", 1);

        return value != null && (int)value == 0;
    }

    public static bool SystemUsesDarkTheme()
    {
        var value = Registry.GetValue(
                    @"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize",
                    "SystemUsesLightTheme", 0);

        return value == null || (int)value == 0;
    }
}