Blazor WebView alternate runtime platform

AspNetCore.sln

@@ -1612,6 +1612,16 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.AspNetCore.Compon
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.AspNetCore.Components.WebView.Test", "src\Components\WebView\WebView\test\Microsoft.AspNetCore.Components.WebView.Test.csproj", "{4BD6F0DB-BE9C-4C54-B52A-D20B88855ED5}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Samples", "Samples", "{B730328F-D9E9-4EAA-B28E-4631A14095F9}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "PhotinoPlatform", "PhotinoPlatform", "{44963D50-8B58-44E6-918D-788BCB406695}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "testassets", "testassets", "{3EC71A0E-6515-4A5A-B759-F0BCF1BCFC56}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PhotinoTestApp", "src\Components\WebView\Samples\PhotinoPlatform\testassets\PhotinoTestApp\PhotinoTestApp.csproj", "{558C46DE-DE16-41D5-8DB7-D6D748E32977}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Microsoft.AspNetCore.Components.WebView.Photino", "src\Components\WebView\Samples\PhotinoPlatform\src\Microsoft.AspNetCore.Components.WebView.Photino.csproj", "{B1AA24A4-5E02-4DC1-B57F-6EB03F91E4DD}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -7683,6 +7693,30 @@ Global
 		{4BD6F0DB-BE9C-4C54-B52A-D20B88855ED5}.Release|x64.Build.0 = Release|Any CPU
 		{4BD6F0DB-BE9C-4C54-B52A-D20B88855ED5}.Release|x86.ActiveCfg = Release|Any CPU
 		{4BD6F0DB-BE9C-4C54-B52A-D20B88855ED5}.Release|x86.Build.0 = Release|Any CPU
+		{558C46DE-DE16-41D5-8DB7-D6D748E32977}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{558C46DE-DE16-41D5-8DB7-D6D748E32977}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{558C46DE-DE16-41D5-8DB7-D6D748E32977}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{558C46DE-DE16-41D5-8DB7-D6D748E32977}.Debug|x64.Build.0 = Debug|Any CPU
+		{558C46DE-DE16-41D5-8DB7-D6D748E32977}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{558C46DE-DE16-41D5-8DB7-D6D748E32977}.Debug|x86.Build.0 = Debug|Any CPU
+		{558C46DE-DE16-41D5-8DB7-D6D748E32977}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{558C46DE-DE16-41D5-8DB7-D6D748E32977}.Release|Any CPU.Build.0 = Release|Any CPU
+		{558C46DE-DE16-41D5-8DB7-D6D748E32977}.Release|x64.ActiveCfg = Release|Any CPU
+		{558C46DE-DE16-41D5-8DB7-D6D748E32977}.Release|x64.Build.0 = Release|Any CPU
+		{558C46DE-DE16-41D5-8DB7-D6D748E32977}.Release|x86.ActiveCfg = Release|Any CPU
+		{558C46DE-DE16-41D5-8DB7-D6D748E32977}.Release|x86.Build.0 = Release|Any CPU
+		{B1AA24A4-5E02-4DC1-B57F-6EB03F91E4DD}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B1AA24A4-5E02-4DC1-B57F-6EB03F91E4DD}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B1AA24A4-5E02-4DC1-B57F-6EB03F91E4DD}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{B1AA24A4-5E02-4DC1-B57F-6EB03F91E4DD}.Debug|x64.Build.0 = Debug|Any CPU
+		{B1AA24A4-5E02-4DC1-B57F-6EB03F91E4DD}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{B1AA24A4-5E02-4DC1-B57F-6EB03F91E4DD}.Debug|x86.Build.0 = Debug|Any CPU
+		{B1AA24A4-5E02-4DC1-B57F-6EB03F91E4DD}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B1AA24A4-5E02-4DC1-B57F-6EB03F91E4DD}.Release|Any CPU.Build.0 = Release|Any CPU
+		{B1AA24A4-5E02-4DC1-B57F-6EB03F91E4DD}.Release|x64.ActiveCfg = Release|Any CPU
+		{B1AA24A4-5E02-4DC1-B57F-6EB03F91E4DD}.Release|x64.Build.0 = Release|Any CPU
+		{B1AA24A4-5E02-4DC1-B57F-6EB03F91E4DD}.Release|x86.ActiveCfg = Release|Any CPU
+		{B1AA24A4-5E02-4DC1-B57F-6EB03F91E4DD}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -8481,6 +8515,11 @@ Global
 		{A1D02CE6-1077-410A-81CB-D4BD500FD765} = {0508E463-0269-40C9-B5C2-3B600FB2A28B}
 		{3044DFA5-DE4F-44D8-8DD8-EDF547BE513E} = {C445B129-0A4D-41F5-8347-6534B6B12303}
 		{4BD6F0DB-BE9C-4C54-B52A-D20B88855ED5} = {C445B129-0A4D-41F5-8347-6534B6B12303}
+		{B730328F-D9E9-4EAA-B28E-4631A14095F9} = {C445B129-0A4D-41F5-8347-6534B6B12303}
+		{44963D50-8B58-44E6-918D-788BCB406695} = {B730328F-D9E9-4EAA-B28E-4631A14095F9}
+		{3EC71A0E-6515-4A5A-B759-F0BCF1BCFC56} = {44963D50-8B58-44E6-918D-788BCB406695}
+		{558C46DE-DE16-41D5-8DB7-D6D748E32977} = {3EC71A0E-6515-4A5A-B759-F0BCF1BCFC56}
+		{B1AA24A4-5E02-4DC1-B57F-6EB03F91E4DD} = {44963D50-8B58-44E6-918D-788BCB406695}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {3E8720B3-DBDD-498C-B383-2CC32A054E8F}

eng/Dependencies.props

@@ -175,6 +175,7 @@ and are generated based on the last package release.
     <LatestPackageReference Include="NSwag.ApiDescription.Client" />
     <LatestPackageReference Include="NuGet.Frameworks" />
     <LatestPackageReference Include="NuGet.Versioning" />
+    <LatestPackageReference Include="Photino.NET" />
     <LatestPackageReference Include="PlaywrightSharp" />
     <LatestPackageReference Include="Polly" />
     <LatestPackageReference Include="Polly.Extensions.Http" />

eng/Versions.props

@@ -242,6 +242,7 @@
     <NewtonsoftJsonBsonVersion>1.0.2</NewtonsoftJsonBsonVersion>
     <NewtonsoftJsonVersion>12.0.2</NewtonsoftJsonVersion>
     <NSwagApiDescriptionClientVersion>13.0.4</NSwagApiDescriptionClientVersion>
+    <PhotinoNETVersion>1.1.6</PhotinoNETVersion>
     <PlaywrightSharpVersion>0.192.0</PlaywrightSharpVersion>
     <PollyExtensionsHttpVersion>3.0.0</PollyExtensionsHttpVersion>
     <PollyVersion>7.2.2</PollyVersion>

src/Components/ComponentsNoDeps.slnf

@@ -37,6 +37,8 @@
       "src\\Components\\WebAssembly\\testassets\\Wasm.Authentication.Server\\Wasm.Authentication.Server.csproj",
       "src\\Components\\WebAssembly\\testassets\\Wasm.Authentication.Shared\\Wasm.Authentication.Shared.csproj",
       "src\\Components\\WebAssembly\\testassets\\WasmLinkerTest\\WasmLinkerTest.csproj",
+      "src\\Components\\WebView\\Samples\\PhotinoPlatform\\src\\Microsoft.AspNetCore.Components.WebView.Photino.csproj",
+      "src\\Components\\WebView\\Samples\\PhotinoPlatform\\testassets\\PhotinoTestApp\\PhotinoTestApp.csproj",
       "src\\Components\\WebView\\WebView\\src\\Microsoft.AspNetCore.Components.WebView.csproj",
       "src\\Components\\WebView\\WebView\\test\\Microsoft.AspNetCore.Components.WebView.Test.csproj",
       "src\\Components\\Web\\src\\Microsoft.AspNetCore.Components.Web.csproj",

src/Components/WebView/Samples/PhotinoPlatform/src/BlazorWindow.cs

@@ -0,0 +1,85 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using Microsoft.Extensions.FileProviders;
+using PhotinoNET;
+
+namespace Microsoft.AspNetCore.Components.WebView.Photino
+{
+    /// <summary>
+    /// A window containing a Blazor web view.
+    /// </summary>
+    public class BlazorWindow
+    {
+        private readonly PhotinoWindow _window;
+        private readonly PhotinoWebViewManager _manager;
+
+        /// <summary>
+        /// Constructs an instance of <see cref="BlazorWindow"/>.
+        /// </summary>
+        /// <param name="title">The window title.</param>
+        /// <param name="hostPage">The path to the host page.</param>
+        /// <param name="services">The service provider.</param>
+        /// <param name="configureWindow">A callback that configures the window.</param>
+        public BlazorWindow(
+            string title,
+            string hostPage,
+            IServiceProvider services,
+            Action<PhotinoWindowOptions>? configureWindow = null)
+        {
+            _window = new PhotinoWindow(title, options =>
+            {
+                options.CustomSchemeHandlers.Add(PhotinoWebViewManager.BlazorAppScheme, HandleWebRequest);
+                configureWindow?.Invoke(options);
+            }, width: 1600, height: 1200, left: 300, top: 300);
+
+            // We assume the host page is always in the root of the content directory, because it's
+            // unclear there's any other use case. We can add more options later if so.
+            var contentRootDir = Path.GetDirectoryName(Path.GetFullPath(hostPage))!;
+            var hostPageRelativePath = Path.GetRelativePath(contentRootDir, hostPage);
+            var fileProvider = new PhysicalFileProvider(contentRootDir);
+
+            var dispatcher = new PhotinoDispatcher(_window);
+            _manager = new PhotinoWebViewManager(_window, services, dispatcher, new Uri(PhotinoWebViewManager.AppBaseUri), fileProvider, hostPageRelativePath);
+        }
+
+        /// <summary>
+        /// Gets the underlying <see cref="PhotinoWindow"/>.
+        /// </summary>
+        public PhotinoWindow Photino => _window;
+
+        /// <summary>
+        /// Adds a root component to the window.
+        /// </summary>
+        /// <typeparam name="TComponent">The component type.</typeparam>
+        /// <param name="selector">A CSS selector describing where the component should be added in the host page.</param>
+        /// <param name="parameters">An optional dictionary of parameters to pass to the component.</param>
+        public void AddRootComponent<TComponent>(string selector, IDictionary<string, object?>? parameters = null) where TComponent: IComponent
+        {
+            var parameterView = parameters == null
+                ? ParameterView.Empty
+                : ParameterView.FromDictionary(parameters);
+
+            // Dispatch because this is going to be async, and we want to catch any errors
+            _ = _manager.Dispatcher.InvokeAsync(async () =>
+            {
+                await _manager.AddRootComponentAsync(typeof(TComponent), selector, parameterView);
+            }); 
+        }
+
+        /// <summary>
+        /// Shows the window and waits for it to be closed.
+        /// </summary>
+        public void Run()
+        {
+            _manager.Navigate("/");
+            _window.WaitForClose();
+        }
+
+        private Stream HandleWebRequest(string url, out string contentType)
+            => _manager.HandleWebRequest(url, out contentType!)!;
+    }
+}

src/Components/WebView/Samples/PhotinoPlatform/src/Microsoft.AspNetCore.Components.WebView.Photino.csproj

@@ -0,0 +1,16 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFrameworks>$(DefaultNetCoreTargetFramework)</TargetFrameworks>
+    <Description>Intended for internal testing use only.</Description>
+    <IsShippingPackage>false</IsShippingPackage>
+    <SignAssembly>false</SignAssembly>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Reference Include="Microsoft.AspNetCore.Components.WebView" />
+    <Reference Include="Photino.NET" />
+  </ItemGroup>
+
+</Project>

src/Components/WebView/Samples/PhotinoPlatform/src/PhotinoDispatcher.cs

@@ -0,0 +1,67 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using PhotinoNET;
+
+namespace Microsoft.AspNetCore.Components.WebView.Photino
+{
+    internal class PhotinoDispatcher : Dispatcher
+    {
+        private readonly PhotinoSynchronizationContext _context;
+
+        public PhotinoDispatcher(PhotinoWindow window)
+        {
+            _context = new PhotinoSynchronizationContext(window);
+            _context.UnhandledException += (sender, e) =>
+            {
+                OnUnhandledException(e);
+            };
+        }
+
+        public override bool CheckAccess() => SynchronizationContext.Current == _context;
+
+        public override Task InvokeAsync(Action workItem)
+        {
+            if (CheckAccess())
+            {
+                workItem();
+                return Task.CompletedTask;
+            }
+
+            return _context.InvokeAsync(workItem);
+        }
+
+        public override Task InvokeAsync(Func<Task> workItem)
+        {
+            if (CheckAccess())
+            {
+                return workItem();
+            }
+
+            return _context.InvokeAsync(workItem);
+        }
+
+        public override Task<TResult> InvokeAsync<TResult>(Func<TResult> workItem)
+        {
+            if (CheckAccess())
+            {
+                return Task.FromResult(workItem());
+            }
+
+            return _context.InvokeAsync<TResult>(workItem);
+        }
+
+        public override Task<TResult> InvokeAsync<TResult>(Func<Task<TResult>> workItem)
+        {
+            if (CheckAccess())
+            {
+                return workItem();
+            }
+
+            return _context.InvokeAsync<TResult>(workItem);
+        }
+    }
+}