Avalonia/src/Avalonia.Controls/Platform/IWindowingPlatform.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Avalonia.Platform
{
    public interface IWindowingPlatform
    {
        IWindowImpl CreateWindow();
        IEmbeddableWindowImpl CreateEmbeddableWindow();
        IPopupImpl CreatePopup();
    }
}