ShrlAlgoToolkit/WPFluent/Appearance/WindowBackgroundManager.cs

using WPFluent.Controls;
using WPFluent.Interop;

namespace WPFluent.Appearance;

/// <summary>
/// 便于管理窗口背景。
/// </summary>
/// <example>
/// <code lang="csharp"> /// WindowBackgroundManager.UpdateBackground( ///     observedWindow.RootVisual, ///    
/// currentApplicationTheme, ///     observedWindow.Backdrop /// ); ///</code>
/// </example>
public static class WindowBackgroundManager
{
    /// <summary>
    /// Forces change to application background. Required if custom background effect was previously applied.
    /// </summary>
    public static void UpdateBackground(Window? window, ThemeType applicationTheme, WindowBackdropType backdrop)
    {
        if (window is null)
        {
            return;
        }

        //_ = WindowBackdrop.RemoveBackdrop(window);

        if (applicationTheme == ThemeType.Unknow)
        {
            backdrop = WindowBackdropType.None;
        }

        if (backdrop is not WindowBackdropType.None)
        {
            _ = WindowBackdrop.RemoveBackground(window);
        }

        //_ = WindowBackdrop.ApplyBackdrop(window, backdrop);

        if (applicationTheme is ThemeType.Dark)
        {
            //ApplyDarkThemeToWindow(window);
        }
        else
        {
            //RemoveDarkThemeFromWindow(window);
        }

        //_ = WindowBackdrop.RemoveTitlebarBackground(window);

        foreach (object? subWindow in window.OwnedWindows)
        {
            if (subWindow is Window windowSubWindow)
            {
                //_ = WindowBackdrop.ApplyBackdrop(windowSubWindow, backdrop);

                if (applicationTheme is ThemeType.Dark)
                {
                    //ApplyDarkThemeToWindow(windowSubWindow);
                }
                else
                {
                    //RemoveDarkThemeFromWindow(windowSubWindow);
                }

                //_ = WindowBackdrop.RemoveTitlebarBackground(window);
            }
        }
    }
}