Use it in runner - POC

src/runner/settings_window.cpp

@@ -277,7 +277,7 @@ void run_settings_window(bool show_oobe_window, std::optional<std::wstring> sett
     // Arg 1: executable path.
     std::wstring executable_path = get_module_folderpath();
 
-    executable_path.append(L"\\Settings\\PowerToys.Settings.exe");
+    executable_path.append(L"\\SettingsUI\\net5.0-windows10.0.19041.0\\Microsoft.PowerToys.Settings.UI.WinUI3.exe");
 
     // Args 2,3: pipe server. Generate unique names for the pipes, if getting a UUID is possible.
     std::wstring powertoys_pipe_name(L"\\\\.\\pipe\\powertoys_runner_");

src/settings-ui/Microsoft.PowerToys.Settings.UI.WinUI3/App.xaml.cs

@@ -4,6 +4,11 @@ using Microsoft.PowerToys.Settings.UI.Library;
 
 // TODO(stefan)
 using WindowsUI = Windows.UI;
+using interop;
+using System;
+using System.Diagnostics;
+using ManagedCommon;
+using Microsoft.PowerToys.Settings.UI.WinUI3.Views;
 
 // To learn more about WinUI, the WinUI project structure,
 // and more about our project templates, see: http://aka.ms/winui-project-info.
@@ -15,6 +20,35 @@ namespace Microsoft.PowerToys.Settings.UI.WinUI3
     /// </summary>
     public partial class App : Application
     {
+        private enum Arguments
+        {
+            PTPipeName = 1,
+            SettingsPipeName,
+            PTPid,
+            Theme, // used in the old settings
+            ElevatedStatus,
+            IsUserAdmin,
+            ShowOobeWindow,
+            SettingsWindow,
+        }
+
+        // Quantity of arguments
+        private const int RequiredArgumentsQty = 8;
+        private const int RequiredAndOptionalArgumentsQty = 9;
+
+        // Create an instance of the  IPC wrapper.
+        private static TwoWayPipeMessageIPCManaged ipcmanager;
+
+        public static bool IsElevated { get; set; }
+
+        public static bool IsUserAnAdmin { get; set; }
+
+        public static int PowerToysPID { get; set; }
+
+        public static Action<string> IPCMessageReceivedCallback { get; set; }
+        public bool ShowOobe { get; set; }
+        public Type StartupPage { get; set; } = typeof(Microsoft.PowerToys.Settings.UI.WinUI3.Views.GeneralPage);
+
         /// <summary>
         /// Initializes the singleton application object.  This is the first line of authored code
         /// executed, and as such is the logical equivalent of main() or WinMain().
@@ -36,6 +70,70 @@ namespace Microsoft.PowerToys.Settings.UI.WinUI3
             //m_window.SetTitleBar(m_window.CustomTitleBar); // This should work according to docs, but it doesn't.... So disabling for now together with ExtendsContentIntoTitleBar
             m_window.Title = "PowerToys Settings";
             m_window.Activate();
+
+            var cmdArgs = Environment.GetCommandLineArgs();
+            if (cmdArgs != null && cmdArgs.Length >= RequiredArgumentsQty)
+            {
+                _ = int.TryParse(cmdArgs[(int)Arguments.PTPid], out int powerToysPID);
+                PowerToysPID = powerToysPID;
+                
+                IsElevated = cmdArgs[(int)Arguments.ElevatedStatus] == "true";
+                IsUserAnAdmin = cmdArgs[(int)Arguments.IsUserAdmin] == "true";
+                ShowOobe = cmdArgs[(int)Arguments.ShowOobeWindow] == "true";
+
+                if (cmdArgs.Length == RequiredAndOptionalArgumentsQty)
+                {
+                    // open specific window
+                    switch (cmdArgs[(int)Arguments.SettingsWindow])
+                    {
+                        case "Overview": StartupPage = typeof(Microsoft.PowerToys.Settings.UI.WinUI3.Views.GeneralPage); break;
+                        case "Awake": StartupPage = typeof(Microsoft.PowerToys.Settings.UI.WinUI3.Views.AwakePage); break;
+                        case "ColorPicker": StartupPage = typeof(Microsoft.PowerToys.Settings.UI.WinUI3.Views.ColorPickerPage); break;
+                        case "FancyZones": StartupPage = typeof(Microsoft.PowerToys.Settings.UI.WinUI3.Views.FancyZonesPage); break;
+                        case "Run": StartupPage = typeof(Microsoft.PowerToys.Settings.UI.WinUI3.Views.PowerLauncherPage); break;
+                        case "ImageResizer": StartupPage = typeof(Microsoft.PowerToys.Settings.UI.WinUI3.Views.ImageResizerPage); break;
+                        case "KBM": StartupPage = typeof(Microsoft.PowerToys.Settings.UI.WinUI3.Views.KeyboardManagerPage); break;
+                        case "MouseUtils": StartupPage = typeof(Microsoft.PowerToys.Settings.UI.WinUI3.Views.MouseUtilsPage); break;
+                        case "PowerRename": StartupPage = typeof(Microsoft.PowerToys.Settings.UI.WinUI3.Views.PowerRenamePage); break;
+                        case "FileExplorer": StartupPage = typeof(Microsoft.PowerToys.Settings.UI.WinUI3.Views.PowerPreviewPage); break;
+                        case "ShortcutGuide": StartupPage = typeof(Microsoft.PowerToys.Settings.UI.WinUI3.Views.ShortcutGuidePage); break;
+                        case "VideoConference": StartupPage = typeof(Microsoft.PowerToys.Settings.UI.WinUI3.Views.VideoConferencePage); break;
+                        default: break;// TODO(stefan): This crashes Debug.Assert(false, "Unexpected SettingsWindow argument value"); break;
+                    }
+                    // m_window.Asd().Text = StartupPage.ToString() + " " + cmdArgs[(int)Arguments.SettingsWindow];
+                }
+
+                RunnerHelper.WaitForPowerToysRunner(PowerToysPID, () =>
+                {
+                    Environment.Exit(0);
+                });
+
+                ipcmanager = new TwoWayPipeMessageIPCManaged(cmdArgs[(int)Arguments.SettingsPipeName], cmdArgs[(int)Arguments.PTPipeName], (string message) =>
+                {
+                    if (IPCMessageReceivedCallback != null && message.Length > 0)
+                    {
+                        m_window.DispatcherQueue.TryEnqueue(() =>
+                        {
+                            // TODO(stefan): not sure if this is correct
+                            IPCMessageReceivedCallback(message);
+                        });
+                    }
+                });
+                ipcmanager.Start();
+                //app.Run();
+            }
+            else
+            {
+/*                MessageBox.Show(
+                    "The application cannot be run as a standalone process. Please start the application through the runner.",
+                    "Forbidden",
+                    MessageBoxButton.OK);
+                app.Shutdown();
+*/            }
+        }
+        public static TwoWayPipeMessageIPCManaged GetTwoWayIPCManager()
+        {
+            return ipcmanager;
         }
 
         public static bool IsDarkTheme()
@@ -46,7 +144,7 @@ namespace Microsoft.PowerToys.Settings.UI.WinUI3
             return selectedTheme == "DARK" || (selectedTheme == "SYSTEM" && uiTheme == "#FF000000");
         }
 
-        private Window m_window;
+        private MainWindow m_window;
         private static ISettingsUtils settingsUtils = new SettingsUtils();
     }
 }

src/settings-ui/Microsoft.PowerToys.Settings.UI.WinUI3/MainWindow.xaml

@@ -18,6 +18,6 @@
                 <TextBlock Style="{StaticResource CaptionTextBlockStyle}" Margin="12,0,0,0" Text="PowerToys" />
             </StackPanel>
         </Grid>-->
-        <local:ShellPage Grid.Row="1"/>
+        <local:ShellPage Grid.Row="1" x:Name="shellPage"/>
     </Grid>
 </Window>

src/settings-ui/Microsoft.PowerToys.Settings.UI.WinUI3/MainWindow.xaml.cs

@@ -1,17 +1,8 @@
-using Microsoft.UI.Xaml;
-using Microsoft.UI.Xaml.Controls;
-using Microsoft.UI.Xaml.Controls.Primitives;
-using Microsoft.UI.Xaml.Data;
-using Microsoft.UI.Xaml.Input;
-using Microsoft.UI.Xaml.Media;
-using Microsoft.UI.Xaml.Navigation;
+using Microsoft.PowerToys.Settings.UI.Library.Utilities;
+using Microsoft.PowerToys.Settings.UI.WinUI3.Views;
+using Microsoft.UI.Xaml;
 using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using System.Runtime.InteropServices.WindowsRuntime;
-using Windows.Foundation;
-using Windows.Foundation.Collections;
+using Windows.Data.Json;
 
 // To learn more about WinUI, the WinUI project structure,
 // and more about our project templates, see: http://aka.ms/winui-project-info.
@@ -26,6 +17,61 @@ namespace Microsoft.PowerToys.Settings.UI.WinUI3
         public MainWindow()
         {
             this.InitializeComponent();
+
+            // send IPC Message
+            ShellPage.SetDefaultSndMessageCallback(msg =>
+            {
+                // IPC Manager is null when launching runner directly
+                App.GetTwoWayIPCManager()?.Send(msg);
+            });
+
+            // send IPC Message
+            ShellPage.SetRestartAdminSndMessageCallback(msg =>
+            {
+                App.GetTwoWayIPCManager()?.Send(msg);
+                // TODO(stefan)
+                // isOpen = false;
+                Environment.Exit(0);
+                // System.Windows.Application.Current.Shutdown(); // close application
+            });
+
+            // send IPC Message
+            ShellPage.SetCheckForUpdatesMessageCallback(msg =>
+            {
+                App.GetTwoWayIPCManager()?.Send(msg);
+            });
+
+            // open oobe
+            ShellPage.SetOpenOobeCallback(() =>
+            {
+/*                var oobe = new OobeWindow();
+                oobe.Show();
+*/            });
+
+            // receive IPC Message
+            App.IPCMessageReceivedCallback = (string msg) =>
+            {
+                if (ShellPage.ShellHandler.IPCResponseHandleList != null)
+                {
+                    var success = JsonObject.TryParse(msg, out JsonObject json);
+                    if (success)
+                    {
+                        foreach (Action<JsonObject> handle in ShellPage.ShellHandler.IPCResponseHandleList)
+                        {
+                            handle(json);
+                        }
+                    }
+                    else
+                    {
+                        Logger.LogError("Failed to parse JSON from IPC message.");
+                    }
+                }
+            };
+
+            ShellPage.SetElevationStatus(App.IsElevated);
+            ShellPage.SetIsUserAnAdmin(App.IsUserAnAdmin);
+            shellPage.Refresh();
         }
+
     }
 }

src/settings-ui/Microsoft.PowerToys.Settings.UI.WinUI3/Microsoft.PowerToys.Settings.UI.WinUI3.csproj

@@ -11,6 +11,7 @@
     <UseWinUI>true</UseWinUI>
     <EnablePreviewMsixTooling>true</EnablePreviewMsixTooling>
     <WindowsPackageType>None</WindowsPackageType>
+    <ApplicationIcon>icon.ico</ApplicationIcon>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x86'">
     <OutputPath></OutputPath>