Shrlalgo.RvKits/ShrlAlgoToolkit.Core/Assists/SingletonChildWindowManager.cs

using System.Windows;
using System.Windows.Interop;

namespace ShrlAlgoToolkit.Core.Assists;

public static class SingletonChildWindowManager
{
    private static readonly Dictionary<Type, Window> Windows = [];
    public static void ShowOrActivate<TWindow, TViewModel>(params object[] viewModelParams)
        where TWindow : Window, new()
        where TViewModel : class
    {
        var windowType = typeof(TWindow);
        if (Windows.TryGetValue(windowType, out var window) && window != null)
        {
            window.Activate();
        }
        else
        {
            //CloseAllWindowsExcept(windowType);
            Windows[windowType] = new TWindow();
            Windows[windowType].Closed += (_, _) => Windows[windowType] = null;
            if (Windows[windowType].DataContext == null || Windows[windowType].DataContext is not TViewModel)
            {
                Windows[windowType].DataContext = viewModelParams.Length == 0
                    ? Activator.CreateInstance<TViewModel>()
                    : Activator.CreateInstance(typeof(TViewModel), viewModelParams);
            }
            _ = new WindowInteropHelper(Windows[windowType]) { Owner = System.Diagnostics.Process.GetCurrentProcess().MainWindowHandle };
            Windows[windowType].Show();
        }
    }
}