AMLApp.cs

// Copyright (c) 2017 AutomationML e.V.
#nullable disable
using ControlzEx.Theming;
using System;
using System.Linq;
using System.Windows;

namespace Aml.Skins;

public static class AMLApp
{
    public static Action<ResourceDictionary> ApplyColors { get; set; }
    public static ResourceDictionary ThemeColors { get; set; }


    public static bool IsDarkMode { get; private set; }

    /// <summary>
    ///     Applies the skin to the application
    /// </summary>
    /// <param name="app">The application.</param>
    /// <param name="skinDictionaryUri">The skin dictionary URI.</param>
    public static void ApplySkin(Application app, Uri skinDictionaryUri)
    {
        // ThemeManager.Current.ThemeSyncMode = ThemeSyncMode.

        // Load the ResourceDictionary into memory.
        var skinDict = Application.LoadComponent(skinDictionaryUri) as ResourceDictionary;

        var mergedDicts = app.Resources.MergedDictionaries;

        var skinSource = @"/Aml.Skins;component/Themes";

        // Remove the existing skin dictionary, if one exists.
        foreach (var dict in mergedDicts.ToList())
        {
            if (dict.Source != null && dict.Source.OriginalString.Contains(skinSource))
            {
                mergedDicts.Remove(dict);
            }
        }

        // Apply the selected skin so that all elements in the
        // application will honor the new look and feel.
        mergedDicts.Add(skinDict);

        var theme = skinDictionaryUri.OriginalString.Contains("Dark.Styles") ? "Dark" : "Light";
        ThemeManager.Current.ChangeThemeBaseColor(Application.Current, theme);

        IsDarkMode = theme == "Dark";
        SetColors(theme == "Dark");
    }

    public static void SetColors(bool isDarkMode)
    {
        ThemeColors = isDarkMode
            ? new ResourceDictionary { Source = SkinSource.DarkSkinColors }
            : new ResourceDictionary { Source = SkinSource.LightSkinColors };

        ApplyColors?.Invoke(ThemeColors);
    }
}