From f06b57f2400b67dbd4dc0dc2217f48b3e5126248 Mon Sep 17 00:00:00 2001
From: "Frank A. Krueger" <fak@praeclarum.org>
Date: Wed, 8 Nov 2017 23:12:59 -0800
Subject: [PATCH] Init Forms platform

---
 Ooui.Forms/Forms.cs           | 97 +++++++++++++++++++++++++++++++++++
 Ooui.Forms/PageExtensions.cs  | 15 ++++++
 Samples/Program.cs            |  3 +-
 Samples/Samples.csproj        |  4 ++
 Samples/XamarinFormsSample.cs | 36 +++++++++++++
 5 files changed, 154 insertions(+), 1 deletion(-)
 create mode 100644 Ooui.Forms/Forms.cs
 create mode 100644 Samples/XamarinFormsSample.cs

diff --git a/Ooui.Forms/Forms.cs b/Ooui.Forms/Forms.cs
new file mode 100644
index 0000000..5399852
--- /dev/null
+++ b/Ooui.Forms/Forms.cs
@@ -0,0 +1,97 @@
+using System;
+using System.Diagnostics;
+using Xamarin.Forms;
+using Xamarin.Forms.Internals;
+using Ooui.Forms;
+using System.IO;
+using System.Reflection;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Xamarin.Forms
+{
+	public static class Forms
+	{
+		public static bool IsInitialized { get; private set; }
+
+		public static void Init ()
+		{
+			if (IsInitialized)
+				return;
+			IsInitialized = true;
+
+			Log.Listeners.Add (new DelegateLogListener ((c, m) => Trace.WriteLine (m, c)));
+
+			Device.SetIdiom (TargetIdiom.Desktop);
+			Device.PlatformServices = new OouiPlatformServices ();
+			Device.Info = new OouiDeviceInfo ();
+
+			Registrar.RegisterAll (new[] {
+				typeof(ExportRendererAttribute),
+				//typeof(ExportCellAttribute),
+				//typeof(ExportImageSourceHandlerAttribute),
+			});
+		}
+
+		class OouiDeviceInfo : DeviceInfo
+		{
+			public override Size PixelScreenSize => new Size (640, 480);
+
+			public override Size ScaledScreenSize => PixelScreenSize;
+
+			public override double ScalingFactor => 1;
+		}
+
+		class OouiPlatformServices : IPlatformServices
+		{
+			public bool IsInvokeRequired => false;
+
+			public string RuntimePlatform => "Ooui";
+
+			public void BeginInvokeOnMainThread (Action action)
+			{
+				Task.Run (action);
+			}
+
+			public Ticker CreateTicker ()
+			{
+				throw new NotImplementedException ();
+			}
+
+			public Assembly[] GetAssemblies ()
+			{
+				return AppDomain.CurrentDomain.GetAssemblies ();
+			}
+
+			public string GetMD5Hash (string input)
+			{
+				throw new NotImplementedException ();
+			}
+
+			public double GetNamedSize (NamedSize size, Type targetElementType, bool useOldSizes)
+			{
+				throw new NotImplementedException ();
+			}
+
+			public Task<Stream> GetStreamAsync (Uri uri, CancellationToken cancellationToken)
+			{
+				throw new NotImplementedException ();
+			}
+
+			public IIsolatedStorageFile GetUserStoreForApplication ()
+			{
+				throw new NotImplementedException ();
+			}
+
+			public void OpenUriAction (Uri uri)
+			{
+				throw new NotImplementedException ();
+			}
+
+			public void StartTimer (TimeSpan interval, Func<bool> callback)
+			{
+				throw new NotImplementedException ();
+			}
+		}
+	}
+}
diff --git a/Ooui.Forms/PageExtensions.cs b/Ooui.Forms/PageExtensions.cs
index 398ad59..d9cc03d 100644
--- a/Ooui.Forms/PageExtensions.cs
+++ b/Ooui.Forms/PageExtensions.cs
@@ -1,10 +1,25 @@
 using System;
+
 namespace Ooui.Forms
 {
 	public static class PageExtensions
 	{
+		public static void Publish (this Xamarin.Forms.Page page, string path)
+		{
+			UI.Publish (path, () => page.CreateElement ());
+		}
+
+		public static void PublishShared (this Xamarin.Forms.Page page, string path)
+		{
+			var lazyPage = new Lazy<Element> ((() => page.CreateElement ()), true);
+			UI.Publish (path, () => lazyPage.Value);
+		}
+
 		public static Element CreateElement (this Xamarin.Forms.Page page)
 		{
+			if (!Xamarin.Forms.Forms.IsInitialized)
+				throw new InvalidOperationException ("call Forms.Init() before this");
+
 			throw new NotImplementedException ();
 		}
 	}
diff --git a/Samples/Program.cs b/Samples/Program.cs
index 72fd445..80723e5 100644
--- a/Samples/Program.cs
+++ b/Samples/Program.cs
@@ -27,8 +27,9 @@ namespace Samples
             new TodoSample ().Publish ();
             new DrawSample ().Publish ();
 			new FilesSample ().Publish ();
+			new XamarinFormsSample ().Publish ();
 
-			UI.Present ("/files");
+			UI.Present ("/xamarin-forms");
 
             Console.ReadLine ();
         }
diff --git a/Samples/Samples.csproj b/Samples/Samples.csproj
index abebf5d..db31a86 100644
--- a/Samples/Samples.csproj
+++ b/Samples/Samples.csproj
@@ -2,8 +2,12 @@
 
   <ItemGroup>
     <ProjectReference Include="..\Ooui\Ooui.csproj" />
+    <ProjectReference Include="..\Ooui.Forms\Ooui.Forms.csproj" />
   </ItemGroup>
 
+  <ItemGroup>
+    <PackageReference Include="Xamarin.Forms" Version="2.4.0.38779" />
+  </ItemGroup>
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <TargetFramework>netcoreapp2.0</TargetFramework>
diff --git a/Samples/XamarinFormsSample.cs b/Samples/XamarinFormsSample.cs
new file mode 100644
index 0000000..644a7ed
--- /dev/null
+++ b/Samples/XamarinFormsSample.cs
@@ -0,0 +1,36 @@
+using System;
+using Xamarin.Forms;
+using Ooui.Forms;
+
+namespace Samples
+{
+	public class XamarinFormsSample
+	{
+		public void Publish ()
+		{
+			Forms.Init ();
+
+			var countLabel = new Label {
+				Text = "0",
+			};
+			var countButton = new Button {
+			};
+			countButton.Clicked += (sender, e) => {
+				var v = int.Parse (countLabel.Text);
+				countLabel.Text = (v + 1).ToString ();
+			};
+			var page = new ContentPage {
+				Content = new StackLayout {
+					Children = {
+						new Label { Text = "Hello World!" },
+						countLabel,
+						countButton,
+					},
+				},
+			};
+
+			page.Publish ("/xamarin-forms");
+			page.PublishShared ("/xamarin-forms-shared");
+		}
+	}
+}