Ooui-tws-port/Ooui.Forms/PageExtensions.cs

using System;
using Xamarin.Forms;

namespace Xamarin.Forms
{
	public static class PageExtensions
	{
		public static void Publish (this Xamarin.Forms.Page page, string path)
		{
			Ooui.UI.Publish (path, () => page.CreateElement ());
		}

		public static void PublishShared (this Xamarin.Forms.Page page, string path)
		{
			var lazyPage = new Lazy<Ooui.Element> ((() => page.CreateElement ()), true);
			Ooui.UI.Publish (path, () => lazyPage.Value);
		}

		public static Ooui.Element CreateElement (this Xamarin.Forms.Page page)
		{
			if (!Xamarin.Forms.Forms.IsInitialized)
				throw new InvalidOperationException ("call Forms.Init() before this");

			if (!(page.RealParent is Application)) {
				var app = new DefaultApplication ();
				app.MainPage = page;
			}

			var result = new Ooui.Forms.Platform ();
			result.SetPage (page);
			return result.Element;
		}

		class DefaultApplication : Application
		{
		}
	}
}