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# Shiny MAUI Shell [![NuGet](https://img.shields.io/nuget/v/Shiny.Maui.Shell?style=for-the-badge)](https://www.nuget.org/packages/Shiny.Maui.Shell) Make .NET MAUI Shell shinier with ViewModel lifecycle management, navigation services, and source generation to remove boilerplate, reduce errors, and make your app testable. Inspired by [Prism Library](https://prismlibrary.com) by Dan Siegel and Brian Lagunas. [Full Documentation](https://shinylib.net/maui) --- ## Features ### 🧭 Navigation — `INavigator` | Capability | Description | |:-----------|:------------| | Route-based | `NavigateTo("Detail", args: [("Id", "123")])` | | ViewModel-based | `NavigateTo<DetailViewModel>(vm => vm.Id = "123")` | | Source-generated | `NavigateToDetail("123")` — zero guesswork | | GoBack | Single page, multi-page `GoBack(3)`, or `PopToRoot()` | | Root navigation | `NavigateTo<DashboardViewModel>(relativeNavigation: false)` — reset the stack | | Navigation builder | Fluent multi-segment: `CreateBuilder().AddDetail(42).AddModal().Navigate()` | | Shell switching | `SwitchShell(new MainShell())` or `SwitchShell<TShell>()` via DI | | Tab badges | Numeric tab badges via route or ViewModel — `SetTabBadge<InboxViewModel>(3)` | | XAML navigation | Attached properties on `Button`, `MenuItem`, and `ToolbarItem` | ### 🛡️ Navigation Interceptors — `INavigationInterceptor` | Capability | Description | |:-----------|:------------| | Guard every navigation | Routes, ViewModels, builder, back, app links, shortcuts, tab taps | | Cancel | `NavigationInterceptorResult.Cancel()` — the user stays put | | Redirect | `Redirect("//Login")` or refactor-safe `Redirect<LoginViewModel>()` | | Destination ViewModel | Resolved and populated *before* the interceptor runs, so guards can read it | | Chained | Multiple interceptors run in `Order` then registration order; a redirect re-runs the chain | | Bypassable | `NavigateTo(..., bypassInterceptors: true)` for the navigation a guard itself performs | | Answerable | Every navigation method returns `Task<bool>` - false when a guard cancelled it | ### 💬 Dialogs — `IDialogs` | Method | Returns | |:-------|:--------| | `Alert(title, message)` | `Task` | | `Confirm(title, message)` | `Task<bool>` | | `Prompt(title, message)` | `Task<string?>` | | `ActionSheet(title, cancel, destructive, ...buttons)` | `Task<string>` | For anything richer than the four primitives above, present one of your own pages as a dialog and `await` a typed result from it with `INavigator.ShowDialog<TViewModel, T>` — see [ViewModel Dialogs](#8-viewmodel-dialogs). > Thread-safe — dispatches to UI thread automatically. Inject separately from `INavigator` for clean separation of concerns. > > **Alternative providers (same `IDialogs` interface, no ViewModel changes needed):** > - `Shiny.Maui.Shell.ShinyDialogs` — owned, animated, themeable dialogs powered by [Shiny.Maui.Controls](https://shinylib.net/controls/dialogs/) (never the native alert/prompt; identical across platforms). > - `Shiny.Maui.Shell.UxDiversDialogs` — styled popup dialogs powered by [UXDivers Popups](https://github.com/uxdivers/uxd-popups). > > Both packages also ship an `IDialogPresenter`, so your *ViewModel* dialogs render as a card over a > dimmed backdrop instead of a modal page — see [Changing how dialogs appear](#changing-how-dialogs-appear). ### 📡 Navigation Events | Event | Fires | Key Properties | |:------|:------|:---------------| | `Navigating` | Before navigation | `FromUri` · `FromViewModel` · `ToUri` · `NavigationType` · `Parameters` | | `Navigated` | After page resolves | `ToUri` · `ToViewModel` · `NavigationType` · `Parameters` | `NavigationType`: `Push` · `SetRoot` · `GoBack` · `PopToRoot` · `SwitchShell` For every navigation - tabs, flyout and back button included - with its outcome, see [Observing Navigation, Routes and Dialogs](#observing-navigation-routes-and-dialogs). ### ♻️ ViewModel Lifecycle | Interface | Method | Purpose | |:----------|:-------|:--------| | `IPageLifecycleAware` | `OnAppearing()` / `OnDisappearing()` | Page visibility hooks | | `INavigationConfirmation` | `Task<bool> CanNavigate()` | Guard leaving the page - user-driven navigation only (tab tap, flyout, hardware back) | | `INavigationAware` | `OnNavigatingFrom(params)` | Mutate parameters before leaving | | `IQueryAttributable` | `ApplyQueryAttributes(params)` | Receive navigation parameters (only for string-based `NavigateTo` — not needed with `[ShellProperty]`) | | `IDisposable` | `Dispose()` | Cleanup when page leaves the stack | ### ⚡ Source Generation | Generated File | What It Does | |:----------------|:------------| | `Routes.g.cs` | Static route constants — `Routes.Detail` | | `NavigationExtensions.g.cs` | Typed methods — `NavigateToDetail(id, page)` with XML docs and `[Description]` attributes | | `NavigationBuilderNavExtensions.g.cs` | Typed builder methods — `AddDetail(id, page)` | | `NavigationBuilderExtensions.g.cs` | One-line DI — `AddGeneratedMaps()` | | `AiExtensions.g.cs` | Route metadata — `GetGeneratedRouteInfo()`, plus `AiMauiShellTools` class with `Prompt`, `Tools`, `GetAiToolApplicableGeneratedRoutes()`, and `NavigateToRoute()` when AI extensions are enabled. Also generates `AddAiTools()` extension on `ShinyAppBuilder` for DI registration | > Invalid route names produce **SHINY001** compiler errors. Disable individual outputs via MSBuild properties. ### 🔌 Custom Handlers | Handler | Description | |:--------|:------------| | `DisableShellFlyoutSwipeHandler` | Disables the flyout swipe gesture while keeping the hamburger button functional. Opt-in via `DisableShellFlyoutSwipeHandler.Register()` | ### ✅ Zero Ceremony - One base class change — `AppShell : ShinyShell` — for deterministic BindingContext assignment - Page–ViewModel mapping with **automatic BindingContext** assignment - Drop-in `[ShellMap]` attribute replaces manual route registration - `IMainThread` for main-thread marshalling that works everywhere Shiny Shell runs — including the `net10.0-macos` (AppKit) target, where MAUI's `MainThread` has no implementation and Shiny marshals via `NSThread`/GCD directly (no extra package dependency) --- ## Getting Started ### 1. Install ```bash dotnet add package Shiny.Maui.Shell ``` ### 2. Configure MauiProgram.cs **With source generation (recommended):** ```csharp builder .UseMauiApp<App>() .UseShinyShell(x => x.AddGeneratedMaps()); ``` **Manual registration:** ```csharp builder .UseMauiApp<App>() .UseShinyShell(x => x .Add<MainPage, MainViewModel>(registerRoute: false) // pages in AppShell.xaml .Add<DetailPage, DetailViewModel>("Detail") .Add<SettingsPage, SettingsViewModel>("Settings") ); ``` ### 3. Set up AppShell Your `AppShell` must inherit from `ShinyShell` instead of `Shell`: **AppShell.xaml:** ```xml <shiny:ShinyShell x:Class="MyApp.AppShell" xmlns="http://schemas.microsoft.com/dotnet/2021/maui" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" xmlns:shiny="clr-namespace:Shiny;assembly=Shiny.Maui.Shell" xmlns:local="clr-namespace:MyApp" Title="MyApp"> <ShellContent Title="Home" ContentTemplate="{DataTemplate local:MainPage}" Route="MainPage" /> </shiny:ShinyShell> ``` **AppShell.xaml.cs:** ```csharp using Shiny; namespace MyApp; public partial class AppShell : ShinyShell { public AppShell() { InitializeComponent(); } } ``` > [!NOTE] > Pages defined in AppShell.xaml should use `registerRoute: false`. ### 4. Navigate Inject `INavigator` into your ViewModels: ```csharp public class MyViewModel(INavigator navigator) { // Route-based navigation with args await navigator.NavigateTo("Detail", args: [("ItemId", "123")]); // ViewModel-based navigation with strongly-typed configuration await navigator.NavigateTo<DetailViewModel>(vm => vm.ItemId = "123"); // Source-generated strongly-typed method (preferred) await navigator.NavigateToDetail("123"); // Root navigation — resets the stack await navigator.NavigateTo<DashboardViewModel>(relativeNavigation: false); // Go back with result await navigator.GoBack(("Result", selectedItem)); // Go back multiple pages await navigator.GoBack(2); // Pop to root await navigator.PopToRoot(); // Switch to a different Shell instance await navigator.SwitchShell(new MainAppShell()); // Switch to a Shell resolved from DI await navigator.SwitchShell<MainAppShell>(); // Set or clear a numeric badge on a tab in the active Shell await navigator.SetTabBadge("Inbox", 3); await navigator.SetTabBadge<InboxViewModel>(7); await navigator.ClearTabBadge("Inbox"); await navigator.ClearTabBadge<InboxViewModel>(); // Fluent multi-segment navigation builder (iOS/Mac Catalyst push several pages without animation) await navigator .CreateBuilder() .AddDetail(id: 42) .AddModal() .Navigate(); // Pop back 2 pages, then push await navigator .CreateBuilder() .PopBack(2) .AddHome() .Navigate(); // Navigate from root with builder await navigator .CreateBuilder(fromRoot: true) .AddDashboard() .AddDetail(id: 1) .Navigate(); } ``` > [!IMPORTANT] > Root navigation (`relativeNavigation: false` or `CreateBuilder(fromRoot: true)`) uses the `//` URI prefix, which requires the target route to be declared in your `AppShell.xaml`. Routes registered only via `Routing.RegisterRoute` or `[ShellMap]` cannot be navigated to from root. Add the page as a `ShellContent` in your Shell XAML and use `registerRoute: false` in `[ShellMap]`. > [!NOTE] > If you're setting arguments on the ViewModel navigation, you should make them observable if they are bound on the Page. > [!IMPORTANT] > Tab badges only work for routes that are already present as tabs in the active Shell. The badge APIs are supported on Android, iOS, Mac Catalyst, and Windows. Linux and macOS AppKit throw `PlatformNotSupportedException`. ### 4.1 XAML Navigation Use `Navigate` attached properties when you want route-based navigation directly from XAML without a ViewModel command: ```xml <ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" xmlns:shiny="clr-namespace:Shiny;assembly=Shiny.Maui.Shell"> <Button Text="Open Detail" shiny:Navigate.Route="Detail" shiny:Navigate.ParameterKey="ItemId" shiny:Navigate.ParameterValue="{Binding SelectedId}" /> <ToolbarItem Text="Home" shiny:Navigate.Route="MainPage" shiny:Navigate.RelativeNavigation="False" /> </ContentPage> ``` For multiple parameters: ```xml <Button Text="Open Modal" shiny:Navigate.Route="modal"> <shiny:Navigate.Parameters> <shiny:NavigationParameters> <shiny:NavigationParameter Key="Arg1" Value="{Binding NavArg}" /> <shiny:NavigationParameter Key="Arg2" Value="5" /> </shiny:NavigationParameters> </shiny:Navigate.Parameters> </Button> ``` `Navigate` currently supports `Button`, `MenuItem`, and `ToolbarItem`. ### 5. Dialogs Inject `IDialogs` for user-facing dialogs: ```csharp public class MyViewModel(IDialogs dialogs) { // Alert await dialogs.Alert("Error", "Something went wrong"); // Confirm if (await dialogs.Confirm("Delete?", "Are you sure?")) { // delete } // Prompt for text input var name = await dialogs.Prompt("Name", "Enter your name", placeholder: "John Doe"); if (name != null) { // user entered a value } // Action sheet var choice = await dialogs.ActionSheet("Options", "Cancel", "Delete", "Edit", "Share"); } ``` ### 6. Shiny Controls Dialogs (Optional) Replace the default native dialogs with the owned, animated, themeable dialog service from [Shiny.Maui.Controls](https://shinylib.net/controls/dialogs/). The dialog is always rendered by the library, so it looks identical across platforms: ```bash dotnet add package Shiny.Maui.Shell.ShinyDialogs ``` Configure in `MauiProgram.cs` — `UseShinyControls()` registers the underlying `IDialogService`, and `UseShinyDialogs()` routes `IDialogs` through it: ```csharp builder .UseMauiApp<App>() .UseShinyControls() // registers the Shiny.Maui.Controls IDialogService .UseShinyShell(x => x .UseShinyDialogs() // route IDialogs through the Controls dialog service .UseShinyDialogPresenter() // ...and render ViewModel dialogs as an overlay card .AddGeneratedMaps() ) ``` Your ViewModels continue using `IDialogs` as before — only the visual presentation changes. `UseShinyDialogPresenter()` is the matching half for [ViewModel dialogs](#8-viewmodel-dialogs): instead of pushing the dialog page onto Shell's modal stack, it floats the page's content as a themed card over a dimmed backdrop, using the active Shiny theme's `Surface` and `Scrim` colours. On a `ShinyContentPage` the overlay goes into that page's own `OverlayHost`; on a plain `ContentPage` it is layered over the content. ```csharp .UseShinyDialogPresenter(o => { o.BackdropOpacity = 0.6; o.CornerRadius = 24; o.MaxWidth = 480; o.DismissOnBackdropTap = false; // dialog closes only via the ViewModel's events }) ``` ### 7. UxDivers Dialogs (Optional) Replace the default platform dialogs with styled popups from [UXDivers Popups](https://github.com/uxdivers/uxd-popups): ```bash dotnet add package UXDivers.Popups.Maui ``` Add theme dictionaries to `App.xaml`: ```xml <ResourceDictionary.MergedDictionaries>  <uxd:DarkTheme xmlns:uxd="clr-namespace:UXDivers.Popups.Maui.Controls;assembly=UXDivers.Popups.Maui" /> <uxd:PopupStyles xmlns:uxd="clr-namespace:UXDivers.Popups.Maui.Controls;assembly=UXDivers.Popups.Maui" /> </ResourceDictionary.MergedDictionaries> ``` Configure in `MauiProgram.cs`: ```csharp builder .UseMauiApp<App>() .UseShinyShell(x => x .UseUxDiversDialogs() // route IDialogs through UXDivers popups .UseUxDiversDialogPresenter() // ...and render ViewModel dialogs as a popup .AddGeneratedMaps() ) ``` Either call initializes the UXDivers popup infrastructure (`UseUXDiversPopups()`), and doing both initializes it once. Your ViewModels continue using `IDialogs` as before — only the visual presentation changes. `UseUxDiversDialogPresenter()` is the matching half for [ViewModel dialogs](#8-viewmodel-dialogs): the dialog page's content is hosted in a UXDivers `PopupPage` — a card over a dimmed backdrop, built the way their own custom popups are, so it matches the alert/confirm/prompt popups beside it. ```csharp .UseUxDiversDialogPresenter(o => { o.BackdropOpacity = 0.6; o.CornerRadius = 24; o.MaxWidth = 480; o.ConfigurePopup = popup => popup.AppearingAnimation = new MoveInPopupAnimation(); }) ``` ### 8. ViewModel Dialogs `IDialogs` covers alert / confirm / prompt / action sheet. When you need a *real* UI to collect a result — a colour picker, a filter sheet, a signature pad — present one of your own Page/ViewModel pairs as a dialog and `await` the value it produces. The ViewModel implements `IDialogAware<T>` and raises one of two events to close itself: ```csharp [ShellMap<PickColorPage>("PickColor")] public partial class PickColorViewModel : ObservableObject, IDialogAware<string> { public event EventHandler<string>? Completed; public event EventHandler? Cancelled; [ShellProperty("The colour to pre-select", required: false)] public string Preset { get; set; } = "Red"; [RelayCommand] void Pick(string colour) => this.Completed?.Invoke(this, colour); [RelayCommand] void Cancel() => this.Cancelled?.Invoke(this, EventArgs.Empty); } ``` The source generator emits a typed `Show{Route}Dialog` extension for it, so the call site needs no type arguments and `[ShellProperty]` values become parameters: ```csharp var result = await navigator.ShowPickColorDialog(preset: "Violet"); if (result.TryGetValue(out var colour)) this.Selected = colour; // or this.Selected = result.ValueOr("Red"); ``` `DialogResult<T>` exists because `default(T)` cannot express cancellation for value types — a `bool` dialog could not otherwise tell "the user chose No" apart from "the user dismissed it". | Outcome | Result | |:--------|:-------| | ViewModel raised `Completed` | `IsCancelled == false`, `Value` set | | ViewModel raised `Cancelled` | `IsCancelled == true` | | User dismissed the dialog (back button, iOS swipe-down) | `IsCancelled == true` | | The `CancellationToken` you passed fired | throws `OperationCanceledException` | **Every dismissal path completes the `await`** — a dialog closed without either event being raised reports cancellation rather than hanging. The underlying method is available directly if you'd rather not use the generated wrapper, though it needs both type arguments spelled out (C# cannot infer a type argument from a constraint): ```csharp var result = await navigator.ShowDialog<PickColorViewModel, string>(x => x.Preset = "Violet"); ``` The dialog ViewModel must be mapped to a page like any other navigable ViewModel — via `[ShellMap]` + `AddGeneratedMaps()` or `ShinyAppBuilder.Add<TPage, TViewModel>()`. #### Lifecycle | Hook | Dialog ViewModel | Page underneath | |:-----|:-----------------|:----------------| | `IPageLifecycleAware.OnAppearing` | ✅ when shown | ✅ when the dialog closes | | `IPageLifecycleAware.OnDisappearing` | ✅ when closed | ✅ when the dialog opens | | `IDisposable.Dispose` | ✅ when closed | — | | `INavigationAware.OnNavigatingFrom` | ❌ not raised | ❌ not raised | | `INavigationConfirmation.CanNavigate` | ❌ not consulted | ❌ not consulted | | `INavigator.Navigating` / `Navigated` | ❌ not raised | ❌ not raised | The three that don't fire are deliberate: showing a dialog is not a navigation stack mutation, and an "are you sure you want to leave?" guard firing because a dialog opened would be wrong. The dialog ViewModel is disposed as the page detaches, which happens marginally *before* `ShowDialog` returns. The `DialogResult<T>` you get back is captured at the moment the ViewModel raised its event and is unaffected — but don't hold on to the ViewModel instance after the await. #### Changing how dialogs appear *How* a dialog appears is decided by the registered `IDialogPresenter` — the ViewModel, the `IDialogAware<T>` contract, and the call site are identical whichever one you pick. | Presenter | Package | Presentation | |:----------|:--------|:-------------| | `ShellModalDialogPresenter` *(default)* | `Shiny.Maui.Shell` | The page on Shell's modal stack | | `ShinyOverlayDialogPresenter` | `Shiny.Maui.Shell.ShinyDialogs` | A themed card over a dimmed backdrop, in the current page | | `UxDiversDialogPresenter` | `Shiny.Maui.Shell.UxDiversDialogs` | A UXDivers `PopupPage` over a dimmed backdrop | ```csharp builder.UseShinyShell(x => x .AddGeneratedMaps() .UseShinyDialogPresenter() // or .UseUxDiversDialogPresenter() ); ``` The two overlay presenters keep the page underneath on screen behind the scrim, which changes the lifecycle table above in one place: the page underneath does **not** disappear when the dialog opens, so it neither raises `OnDisappearing` nor `OnAppearing`. The dialog ViewModel's own hooks — including `Dispose` — fire exactly as they do for a modal. Both are dismissed by a tap on the backdrop (`DismissOnBackdropTap = false` turns that off), and both report a dismissal as `IsCancelled`. The overlay presenter also treats the host page disappearing as a dismissal: an overlay lives inside a page, so a navigation away takes the dialog with it, and the awaiting caller has to be released rather than left hanging. **Writing your own.** Implement `IDialogPresenter` for anything that can host a `Page`: ```csharp public class MyPresenter : IDialogPresenter { // Show the page; complete the Task once it is gone, either because the user // dismissed it or because `dismiss` fired. Never throw on `dismiss`. public async Task Present(Page page, object viewModel, CancellationToken dismiss) { /* ... */ } } builder.UseShinyShell(x => x .AddGeneratedMaps() .UseDialogPresenter<MyPresenter>() ); ``` For a host that takes a `View` rather than a `Page` — a popup, a bottom sheet, a custom overlay — derive from `ViewDialogPresenter` instead. It hands you the page's content with the binding context already set, and takes care of what the page would otherwise have done for you: raising `IPageLifecycleAware`, disposing the ViewModel, and giving the content back to its page afterwards. ```csharp public class MySheetPresenter(IMainThread mainThread) : ViewDialogPresenter(mainThread) { protected override async Task PresentView(View content, object viewModel, CancellationToken dismiss) { // Called on the main thread. Show `content`; complete once it is gone, and // detach it from your host before returning. } } ``` --- ## Navigation Events Subscribe to `Navigating` and `Navigated` on `INavigator` for cross-cutting concerns like logging or analytics: ```csharp public class NavigationLogger( ILogger<NavigationLogger> logger, INavigator navigator ) : IMauiInitializeService { public void Initialize(IServiceProvider services) { navigator.Navigating += (_, args) => logger.LogInformation("Navigating from '{From}' to '{To}' ({Type})", args.FromUri, args.ToUri, args.NavigationType); navigator.Navigated += (_, args) => logger.LogInformation("Navigated to '{To}' - ViewModel: {VM} ({Type})", args.ToUri, args.ToViewModel?.GetType().Name, args.NavigationType); } } // Register in MauiProgram.cs builder.Services.AddSingleton<IMauiInitializeService, NavigationLogger>(); ``` `Navigating` and `Navigated` fire for navigation Shiny performs. To see **everything** - including the tab taps, flyout items and back button Shell handles itself, app links and shortcuts - and how each navigation ended, use a navigation observer. --- ## Observing Navigation, Routes and Dialogs These hooks are for analytics, diagnostics, test harnesses and developer tools. None of them can change what the app does, and registering one does not switch anything else on. ### `INavigationObserver` - every navigation, start to finish ```csharp public class NavigationAnalytics(ILogger<NavigationAnalytics> logger) : INavigationObserver { public void OnNavigationStarted(NavigationStarted nav) => logger.LogInformation("#{Id} {Source} {Type} '{From}' -> '{To}'", nav.Id, nav.Source, nav.NavigationType, nav.FromUri, nav.Uri); public void OnNavigationFinished(NavigationFinished result) => logger.LogInformation("#{Id} {Outcome} at '{Uri}' in {Ms}ms (cancelled by {By}, {Redirects} redirect(s))", result.Navigation.Id, result.Outcome, result.Uri, result.Duration.TotalMilliseconds, result.CancelledBy?.GetType().Name, result.Redirects.Count); } builder.UseShinyShell(x => x .AddGeneratedMaps() .AddNavigationObserver<NavigationAnalytics>() ); // or, from a library that does not own UseShinyShell: // builder.Services.AddSingleton<INavigationObserver, NavigationAnalytics>(); ``` | | | |:--|:--| | `NavigationStarted.Source` | `Navigator` · `Shell` (tab, flyout, back - `ShellSource` says which) · `AppLink` · `Shortcut` | | `NavigationFinished.Outcome` | `Completed` · `Cancelled` · `Redirected` · `Failed` | | `CancelledBy` | The `INavigationInterceptor` that cancelled, or the `INavigationConfirmation` ViewModel that refused. Null when Shell, or a handler outside Shiny, cancelled a Shell-driven navigation | | `Redirects` | Every redirect, in order, with the interceptor that made it | | `Exception` | For `Failed` - a throwing interceptor, a route Shell rejected, or the caller's `CancellationToken` (`OperationCanceledException`) | Every `OnNavigationStarted` is followed by exactly one `OnNavigationFinished` with the same `NavigationStarted`. Unlike an interceptor, an observer never makes Shiny take a Shell deferral or resolve a ViewModel early - an app with no interceptors navigates exactly as it did. Callbacks run synchronously, usually on the main thread, and an observer that throws is logged and ignored. A Shell-driven navigation that Shiny lets through finishes when Shell raises `Navigated`. If Shell, or another `Shell.Navigating` handler, cancels it, it is reported `Cancelled` on the next dispatcher turn (or, for a deferred cancel, when the next Shell-driven navigation starts). ### `IRouteRegistry` - where the app can go ```csharp public class RouteDump(IRouteRegistry routes, ILogger<RouteDump> logger) { public void Log() { foreach (var route in routes.Routes) logger.LogInformation("{Route}: {Page} / {ViewModel} - {Description} ({Params})", route.Route, route.PageType.Name, route.ViewModelType.Name, route.Description, route.Parameters == null ? "unknown" : String.Join(", ", route.Parameters.Select(p => $"{p.TypeName} {p.ParameterName}"))); } } ``` `AddGeneratedMaps()` describes every `[ShellMap]` route - description and `[ShellProperty]` parameters - with no need for the AI extensions. Routes mapped by hand with `Add<TPage, TViewModel>()` report `Parameters` as null (unknown) unless described with `ShinyAppBuilder.AddRouteInfo(...)`. ### `IDialogObserver` - ViewModel dialogs, and answering them ```csharp public class AutoAnswer : IDialogObserver { public void OnDialogShown(PresentedDialog dialog) { if (dialog.ViewModel is PickColorViewModel) dialog.TryComplete("red"); // the ShowDialog caller receives "red" } public void OnDialogClosed(PresentedDialog dialog, DialogClosed result) => Console.WriteLine($"{dialog.ViewModelType.Name}: {(result.IsCancelled ? "cancelled" : result.Value)}"); } builder.UseShinyShell(x => x.AddDialogObserver<AutoAnswer>()); ``` `TryComplete(value)` and `TryCancel()` close the dialog exactly as the ViewModel raising `Completed` / `Cancelled` would - the first result wins, and a value of the wrong type throws. `DialogObservers.Open` (in DI) lists the dialogs currently open. Only `ShowDialog` dialogs are reported; `IDialogs` alerts belong to whichever `IDialogs` implementation is registered. ### Tab badge values `ShellTabBadgeManager` (in DI) reads back what `SetTabBadge` set: `Values` is a snapshot keyed by tab route, and `Get("inbox")` returns one badge or null. --- ## Navigation Interceptors `INavigationInterceptor` sits in front of every navigation the app makes and can let it through, cancel it, or send it somewhere else. Register as many as you like - they run in registration order and the first one to cancel or redirect wins. ```csharp public interface INavigationInterceptor { Task<NavigationInterceptorResult> InterceptNavigationAsync( string uri, object? viewModel, CancellationToken cancellationToken ); // Lowest runs first; ties keep registration order int Order => 0; } ``` Every navigation method returns `Task<bool>` - false means a guard cancelled it: ```csharp if (!await navigator.NavigateTo<DetailViewModel>()) // an interceptor said no ``` ```csharp public class AuthNavigationInterceptor(IAuthService auth) : INavigationInterceptor { // Guards run before anything that only observes public int Order => -100; public async Task<NavigationInterceptorResult> InterceptNavigationAsync( string uri, object? viewModel, CancellationToken cancellationToken ) { if (await auth.IsAuthorized(cancellationToken) || uri.Contains("Login")) return NavigationInterceptorResult.Continue; return NavigationInterceptorResult.Redirect<LoginViewModel>(); // or Redirect("//Login") } } ``` ```csharp // MauiProgram.cs builder.UseShinyShell(x => x .AddGeneratedMaps() .AddNavigationInterceptor<AuthNavigationInterceptor>() .AddNavigationInterceptor<AuditNavigationInterceptor>() // or inline, for a one-line rule .AddNavigationInterceptor((uri, vm, ct) => { Console.WriteLine($"Navigating to {uri}"); return Task.FromResult(NavigationInterceptorResult.Continue); }, order: 100) ); ``` Interceptors run in `Order` (lowest first), then registration order. They are singletons, so keep no per-navigation state in fields. ### What gets intercepted | Path | Intercepted | `viewModel` argument | |---|---|---| | `NavigateTo(route)` | ✅ | Resolved from the route's ViewModel mapping | | `NavigateTo<TViewModel>(configure)` | ✅ | Your instance, after `configure` ran | | `CreateBuilder()...Navigate()` | ✅ | The last segment's ViewModel (the page the user lands on) | | `GoBack` / `PopToRoot` | ✅ | The existing ViewModel from the navigation stack | | App links & app shortcuts | ✅ | The ViewModel with the link's values already applied | | Tab taps, flyout items, hardware back | ✅ | `null` - Shell builds these, so Shiny doesn't construct one | | `ShowDialog` / `SwitchShell` | ❌ | Not navigation | The ViewModel handed over is the **destination** one, resolved and fully populated *before* the interceptor runs - so a guard can decide on the destination's own state, not just its URI, and any change it makes sticks: that instance is what gets bound to the page. (Navigation arguments are applied by Shell afterwards, so they win over an interceptor's edits to the same property, and a route declared as a `ShellContent` in AppShell XAML keeps the ViewModel its page was already bound to - the interceptor sees a resolved instance, but changes to it do not reach an on-screen page.) The page being *left* comes from `INavigationContextAccessor`, along with the rest of the navigation: ```csharp public class UnsavedChangesNavigationInterceptor( INavigationContextAccessor context, IDialogs dialogs ) : INavigationInterceptor { public async Task<NavigationInterceptorResult> InterceptNavigationAsync(string uri, object? viewModel) { if (context.Current?.FromViewModel is not IUnsavedChanges { HasUnsavedChanges: true }) return NavigationInterceptorResult.Continue; return await dialogs.Confirm("Unsaved Changes", "Discard changes?") ? NavigationInterceptorResult.Continue : NavigationInterceptorResult.Cancel(); } } ``` `NavigationContext` carries `FromUri`, `FromViewModel`, `ToUri`, `NavigationType`, `Direction`, `Parameters` and `RedirectCount`. It is only set while an interceptor is running. `Direction` is the coarse question `NavigationType` answers precisely - `Forward` (push), `Back` (`GoBack`, `PopToRoot`) or `Root` (absolute route, Shell swap). It is on `NavigationEventArgs` and `NavigatedEventArgs` too, and any `NavigationType` converts with `.GetDirection()`. ### The escape hatch A guard that navigates would otherwise guard itself. Every navigation method takes `bypassInterceptors`: ```csharp await navigator.NavigateTo<LoginViewModel>(bypassInterceptors: true); await navigator.GoBack(1, bypassInterceptors: true); await navigator.PopToRoot(bypassInterceptors: true); await navigator.CreateBuilder().AddDetail(42).Navigate(bypassInterceptors: true); // the builder is fluent, so it reads fluently too await navigator.CreateBuilder().BypassInterceptors().AddDetail(42).Navigate(); ``` A `RedirectUri` never needs it - the chain restarting on a redirect is deliberate, and a redirect to the destination already being navigated to is ignored rather than looping. Interceptors also receive the `CancellationToken` passed to the navigation call - for the network call an auth guard makes, not for the decision itself. Cancelling it abandons the navigation with an `OperationCanceledException`. ### Cancel and redirect | Result | Behaviour | |---|---| | `NavigationInterceptorResult.Continue` | Next interceptor, then navigate | | `Cancel()` | Nothing navigates, the rest of the chain is skipped, the caller's `Task` completes normally | | `Redirect("Detail")` | Pushes | | `Redirect("//Main/Home")` | Resets the Shell stack | | `Redirect("/Login")` | Same as `//Login` - a single leading slash is promoted | | `Redirect<LoginViewModel>()` | Resets the stack to that ViewModel's route (refactor-safe) | | `Redirect<DetailViewModel>(relativeNavigation: true)` | Pushes that ViewModel's route | A redirect **restarts the whole chain** against the new URI, so the redirect target is guarded as thoroughly as the original destination - and the abandoned destination's ViewModel is dropped rather than bound to anything. Redirecting to the URI already being navigated to is ignored (an unconditional "go to login" guard says this every time the user navigates to login); a genuine redirect loop throws after 10 hops rather than hanging. An exception thrown from an interceptor propagates to the caller and the navigation does not happen - a guard that fails is never treated as a guard that passed. On tab taps and hardware back, where there is no caller, the exception is logged and the navigation is cancelled. A blocked app link reports `AppLinkResult.Blocked` from `IAppLinks.Handle` - distinct from `Unhandled` (nothing matched), because the platform hooks still report a blocked link as handled: saying otherwise invites iOS to open the URL in a browser instead, which is the opposite of what a guard that just blocked it wants. ### Asking the user The interceptor is async, so a dialog is a legal thing to await - the navigation has not been handed to Shell yet and simply waits on the answer. One action sheet can produce all three outcomes (this is `AskFirstNavigationInterceptor`, on the sample's **Route Interceptor** page): ```csharp public class AskFirstNavigationInterceptor( IDialogs dialogs, INavigationContextAccessor context ) : INavigationInterceptor { const string LetItGo = "Let it through"; const string SendElsewhere = "Redirect to Lifecycle"; const string StopIt = "Stop navigation"; public async Task<NavigationInterceptorResult> InterceptNavigationAsync( string uri, object? viewModel, CancellationToken cancellationToken ) { // narrow to one destination - otherwise every tab tap and back press prompts if (viewModel is not DetailViewModel detail) return NavigationInterceptorResult.Continue; var choice = await dialogs.ActionSheet( $"{context.Current?.FromUri} -> {uri} (Text: '{detail.Text}')", cancel: StopIt, // dismissing the sheet lands here too destruction: null, buttons: [LetItGo, SendElsewhere] ); return choice switch { LetItGo => NavigationInterceptorResult.Continue, SendElsewhere => NavigationInterceptorResult.Redirect<LifecycleDemoViewModel>(relativeNavigation: true), _ => NavigationInterceptorResult.Cancel() }; } } ``` Two things worth copying from it: the early `Continue` when the destination is not the one being guarded (an interceptor sees *every* navigation, so an unguarded prompt fires on tab taps), and treating the sheet's cancel/dismiss path as `Cancel()` - the safe default when the user did not actually answer. ### Interceptors vs. the other hooks - **`INavigationInterceptor`** - app-wide, about the destination, can cancel *and* redirect. - **`INavigationConfirmation`** - implemented by the ViewModel being left, answers "may I leave?", and only applies to user-driven Shell navigation (tab tap, flyout item, hardware back button): `INavigator` calls, app links and shortcuts do not consult it. Asked before the interceptors, and unaffected by `bypassInterceptors`, which is about the interceptor chain only. - **`Navigating` / `Navigated` events** - observation only, they cannot change the outcome. - **`INavigationObserver`** - observation only, sees every navigation (Shell-driven included) and how it ended - including which interceptor cancelled or redirected it. --- ## ViewModel Lifecycle Implement these interfaces on your ViewModels as needed. Works just like [Prism Library](https://prismlibrary.com). ```csharp [ShellMap<DetailPage>("Detail", description: "Navigate to the detail page")] public partial class DetailViewModel(INavigator navigator, IDialogs dialogs) : ObservableObject, IPageLifecycleAware, INavigationConfirmation, IDisposable { [ShellProperty("The item identifier")] [ObservableProperty] string itemId; public void OnAppearing() { /* load data */ } public void OnDisappearing() { /* pause */ } // Asked when the user navigates away themselves - a tab tap, a flyout item, the hardware // back button. Programmatic navigation does not consult it; guard that with an // INavigationInterceptor (see Navigation Interceptors above). public async Task<bool> CanNavigate() { if (!hasUnsavedChanges) return true; return await dialogs.Confirm("Unsaved Changes", "Discard changes?"); } public void Dispose() { /* cleanup */ } } ``` --- ## Source Generation Decorate your ViewModels with `[ShellMap]` and `[ShellProperty]` to eliminate boilerplate: **Input:** ```csharp [ShellMap<DetailPage>("Detail", description: "Navigate to the detail page")] public partial class DetailViewModel : ObservableObject { [ShellProperty("The item identifier")] public string ItemId { get; set; } [ShellProperty("Page number for pagination", required: false)] public int Page { get; set; } } ``` **Generated output:** ```csharp // Routes.g.cs — constant name matches the route parameter public static class Routes { public const string Detail = "Detail"; } // NavigationExtensions.g.cs — typed INavigator methods with XML docs and [Description] attributes public static class NavigationExtensions { /// <summary> /// Navigate to the detail page /// </summary> /// <param name="itemId">The item identifier</param> /// <param name="page">Page number for pagination</param> /// <param name="relativeNavigation">If true, it will navigate/stack from where the application currently is otherwise, it will reset the stack to this new route</param> [Description("Navigate to the detail page")] public static Task NavigateToDetail(this INavigator navigator, [Description("The item identifier")] string itemId, [Description("Page number for pagination")] int page = default, [Description("If true, it will navigate/stack from where the application currently is otherwise, it will reset the stack to this new route")] bool relativeNavigation = true) { return navigator.NavigateTo<DetailViewModel>(x => { x.ItemId = itemId; x.Page = page; }, relativeNavigation); } } // NavigationBuilderNavExtensions.g.cs — typed INavigationBuilder methods public static class NavigationBuilderNavExtensions { public static INavigationBuilder AddDetail(this INavigationBuilder builder, string itemId, int page = default) { return builder.Add<DetailViewModel>(x => { x.ItemId = itemId; x.Page = page; }); } } // NavigationBuilderExtensions.g.cs — uses string literals (not Routes.*) public static class NavigationBuilderExtensions { public static ShinyAppBuilder AddGeneratedMaps(this ShinyAppBuilder builder) { builder.Add<DetailPage, DetailViewModel>("Detail"); return builder; } } // DialogExtensions.g.cs — only for ViewModels that also implement IDialogAware<T> public static class DialogExtensions { /// <summary>Navigate to the detail page</summary> /// <param name="itemId">The item identifier</param> /// <param name="cancellationToken">Dismisses the dialog and throws OperationCanceledException. Distinct from the user cancelling, which returns a cancelled DialogResult.</param> [Description("Navigate to the detail page")] public static Task<DialogResult<string>> ShowDetailDialog(this INavigator navigator, [Description("The item identifier")] string itemId, [Description("Page number for pagination")] int page = default, CancellationToken cancellationToken = default) { return navigator.ShowDialog<DetailViewModel, string>(x => { x.ItemId = itemId; x.Page = page; }, cancellationToken); } } // AiExtensions.g.cs — route metadata (always generated) public static class AiExtensions { [Description("This provides a list of routes throughout the application")] public static GeneratedRouteInfo[] GetGeneratedRouteInfo(this INavigator navigator) => [ new("Detail", "Navigate to the detail page", [new("ItemId", "The item identifier", "string", true), new("Page", "Page number for pagination", "int", false)]) ]; } // --- AI class and DI extension below generated when AI extensions are enabled --- // (enabled by default when Microsoft.Extensions.AI is referenced) // AiMauiShellTools — inject via DI for AI-powered navigation public class AiMauiShellTools { public AiMauiShellTools(INavigator navigator) { ... } // Pre-formatted prompt describing all AI-applicable routes public string Prompt { get; } // Ready-to-use AITool[] for route discovery and navigation public AITool[] Tools { get; } // Filtered routes with descriptions and parameters public GeneratedRouteInfo[] GetAiToolApplicableGeneratedRoutes() => ...; // AI-friendly navigation with automatic type conversion public Task<string> NavigateToRoute(string route, Dictionary<string, string>? args = null) { ... } } // DI registration extension public static class AiMauiShellToolsExtensions { public static ShinyAppBuilder AddAiTools(this ShinyAppBuilder builder) { ... } } ``` Then use it: ```csharp // MauiProgram.cs - one line to register everything, including AI tools builder.UseShinyShell(x => x .AddGeneratedMaps() .AddAiTools() // registers AiMauiShellTools as singleton ); // Navigate with generated extension methods - no guesswork await navigator.NavigateToDetail("123", page: 2); // Present a dialog-aware ViewModel and await its typed result - no type arguments needed var result = await navigator.ShowPickColorDialog(preset: "Violet"); // Fluent builder with generated extensions await navigator.CreateBuilder().AddDetail("123", page: 2).Navigate(); // Get route metadata for tooling var routes = navigator.GetGeneratedRouteInfo(); // AI integration — inject AiMauiShellTools via DI public class ChatViewModel(AiMauiShellTools aiTools) { var options = new ChatOptions { Tools = [.. aiTools.Tools] }; // aiTools.Prompt contains the pre-formatted route prompt } ``` ### Route Naming The `route` parameter in `[ShellMap]` drives the generated constant and method names. It must be a valid C# identifier — invalid names produce a **SHINY001** compiler error. ```csharp // Route drives the constant and method name [ShellMap<HomePage>("Dashboard")] // → Routes.Dashboard = "Dashboard" // → NavigateToDashboard(...) // No route — falls back to page type name without "Page" suffix [ShellMap<HomePage>] // → Routes.Home = "HomePage" // → NavigateToHome(...) ``` ### Configuring Source Generation Disable individual generated files via MSBuild properties: ```xml <PropertyGroup>  <ShinyMauiShell_GenerateRouteConstants>false</ShinyMauiShell_GenerateRouteConstants>  <ShinyMauiShell_GenerateNavExtensions>false</ShinyMauiShell_GenerateNavExtensions>  <ShinyMauiShell_GenerateAiExtensions>false</ShinyMauiShell_GenerateAiExtensions>  <ShinyMauiShell_AiToolsClassName>MyAppAiTools</ShinyMauiShell_AiToolsClassName>  <ShinyMauiShell_AiExtensionsClassName>MyAppRouteExtensions</ShinyMauiShell_AiExtensionsClassName>  <ShinyMauiShell_AiNavigateMethodName>GoToPage</ShinyMauiShell_AiNavigateMethodName> </PropertyGroup> ``` | Property | Default | Controls | |---|---|---| | `ShinyMauiShell_GenerateRouteConstants` | `true` | `Routes.g.cs` | | `ShinyMauiShell_GenerateNavExtensions` | `true` | All navigation extensions, `DialogExtensions.g.cs`, and `AddGeneratedMaps` | | `ShinyMauiShell_GenerateAiExtensions` | `true` | `AiMauiShellTools` class, `AddAiTools()`, `GetAiToolApplicableGeneratedRoutes`, `NavigateToRoute`, and `Prompt`. Requires `Microsoft.Extensions.AI` package (**SHINY003** error if missing). Set to `false` to disable | | `ShinyMauiShell_AiToolsClassName` | `AiMauiShellTools` | Class name for the generated AI tools class | | `ShinyMauiShell_AiExtensionsClassName` | `AiExtensions` | Class name for the static route info extensions class | | `ShinyMauiShell_AiNavigateMethodName` | `NavigateToRoute` | Method name for the AI-friendly navigate method | | `ShinyAppLinkSchemes` | _(none)_ | Semicolon-separated custom URL schemes for [App Links](#app-links) | | `ShinyAppLinkDomains` | _(none)_ | Semicolon-separated universal/app link domains | | `ShinyAppLinkValidation` | `true` | Set to `false` to silence the manifest validation warnings | `NavigationBuilderExtensions.g.cs` (`AddGeneratedMaps()`) is only generated when `[ShellMap]` attributes are detected and `ShinyMauiShell_GenerateNavExtensions` is not set to `false`. A **SHINY002** warning is emitted if maps are detected but nav extensions are disabled. `DialogExtensions.g.cs` is only generated when at least one `[ShellMap]` ViewModel also implements `IDialogAware<T>`. Dialog methods are deliberately excluded from the AI tool surface — an AI agent should be driving navigation, not blocking on a modal awaiting human input. --- ## App Links Deep links are declared where the route already is — the `appLinks` argument of `[ShellMap]`: ```csharp [ShellMap<ProductPage>( description: "Shows a product", appLinks: ["product/{id}", "p/{id}"] )] public partial class ProductViewModel : ObservableObject { [ShellProperty("The product id")] public int Id { get; set; } [ShellProperty(required: false)] public string? Tab { get; set; } } ``` `myapp://product/123?tab=reviews` and `https://shinylib.net/p/123` both open `ProductPage` with `Id = 123` and `Tab = "reviews"`. - `{token}` path segments bind to the `[ShellProperty]` of the same name (case-insensitive). - Query string values bind by property name too. A path token wins over a query value of the same name. - Any configured scheme or domain serves any template — adding a domain later needs no attribute change. - Values are converted with `InvariantCulture`, so `1.5` parses the same on every device. - A missing or unparseable **required** value is a routing miss, not a crash: the next-best template is tried, then `OnUnhandled`. ### Setup ```xml <PropertyGroup> <ShinyAppLinkSchemes>myapp</ShinyAppLinkSchemes> <ShinyAppLinkDomains>shinylib.net;www.shinylib.net</ShinyAppLinkDomains> </PropertyGroup> ``` ```csharp .UseShinyShell(x => x.AddGeneratedMaps()) ``` That is the whole setup. Declaring a template **is** the opt-in — `AddGeneratedMaps()` installs the platform delivery points itself (iOS `OpenUrl` and `ContinueUserActivity`, Android `OnCreate` and `OnNewIntent`), so your `AppDelegate`, `MainActivity` and `App` classes stay untouched. Windows has no automatic hook; forward activation to `IAppLinks.Handle(uri)`, which returns an `AppLinkResult` — `Navigated`, `Blocked` (a [navigation interceptor](#navigation-interceptors) cancelled it) or `Unhandled` (nothing matched). Treat anything other than `Unhandled` as handled. Both the `AppDelegate` and `UISceneDelegate` variants are hooked, because `MauiUISceneDelegate` raises only the Scene-prefixed events and does not forward to the others — so an app that declares `UIApplicationSceneManifest` would otherwise get dead links. iOS calls one delegate or the other, never both. `UseAppLinks(...)` is optional and only changes defaults: ### Push or reset is inferred, not configured | `registerRoute` | What the route is | An app link | |---|---|---| | `false` | `ShellContent` / tab / flyout item in AppShell XAML | resets the stack — `//route` | | `true` | `Routing.RegisterRoute`'d detail page | pushes onto the current stack | You already said which it is; the library does not ask twice. On a cold start a pushed route lands on Shell's default item, or on `AppLinkOptions.DefaultRoot` when you set one. ```csharp .UseShinyShell(x => x .AddGeneratedMaps() .UseAppLinks(o => { o.DefaultRoot = "//main/home"; // back stack for cold-start pushes o.ResolveRoute = match => "//somewhere"; // last word on the destination o.OnUnhandled = uri => Task.FromResult(false); }) ) ``` ### Manifests The build validates your manifests and emits a warning containing the exact markup to paste. It does not edit them — Android's merged manifest names the launcher activity with a CRC64 hash of its namespace that MSBuild cannot compute, and Apple universal links additionally need an `apple-app-site-association` file on the domain plus the Associated Domains capability on the App ID. | Code | Platform | Missing | |---|---|---| | **SHINY101** | Android | `[IntentFilter]` for a custom scheme | | **SHINY102** | Android | Verified (`AutoVerify`) `[IntentFilter]` for a domain | | **SHINY103** | iOS / MacCatalyst | `CFBundleURLTypes` in `Info.plist` | | **SHINY104** | iOS / MacCatalyst | `com.apple.developer.associated-domains` in `Entitlements.plist` | | **SHINY105** | Windows | `windows.protocol` extension in `Package.appxmanifest` | Set `<ShinyAppLinkValidation>false</ShinyAppLinkValidation>` to silence them. Creating `Platforms/iOS/Entitlements.plist` is enough on its own — the SDK picks it up without a `CodesignEntitlements` property. ### Building links to share When exactly one scheme (or, failing that, one domain) is configured, an outbound builder is generated per route: ```csharp var uri = navigator.CreateProductAppLink(id: 42, tab: "reviews"); // myapp://product/42?Tab=reviews ``` ### Diagnostics | Code | Severity | Meaning | |---|---|---| | **SHINY005** | Error | Template token has no matching `[ShellProperty]` | | **SHINY006** | Error | A templated property's type cannot be converted from a URL string | | **SHINY007** | Error | Two routes declare templates of the same shape | | **SHINY008** | Warning | `appLinks` declared but no scheme or domain configured | | **SHINY009** | Warning | A required property is not a token in the template, so links must supply it as a query value | --- ## App Shortcuts Home screen quick actions (iOS long-press, Android app shortcuts), declared on the route they open: ```csharp [ShellMap<SearchPage>( Shortcut = "Search", ShortcutSubtitle = "Find anything", ShortcutIcon = "search", ShortcutOrder = 0 )] public partial class SearchViewModel : ObservableObject { } ``` ```csharp .UseShinyShell(x => x.AddGeneratedMaps()) ``` Setting `Shortcut` is what declares the quick action; the other three are optional refinements. The route becomes the shortcut's id, so there is no magic string to keep in sync and no hand-written `switch` over activations. Platform delivery is MAUI's `AppActions` — no `AppDelegate`, `MainActivity` or manifest work. Whether an activation pushes or resets the stack is inferred from `registerRoute`, exactly as it is for [App Links](#app-links). ### Routes that need values An attribute cannot supply a runtime value, so a route with a **required** `[ShellProperty]` cannot declare a shortcut this way — that is a **SHINY010** error. Register those by hand instead: ```csharp .UseShinyShell(x => x .AddGeneratedMaps() .AddAppShortcut<ProductViewModel>( "Featured", icon: "star", id: "featured-product", configure: vm => vm.Id = 42 ) ) ``` The lambda works even though shortcuts outlive the process: only the **id** is persisted by the platform, and the registration is rebuilt every launch and looked up by id on activation. `AddAppShortcut<TViewModel>` is also the way to use shortcuts with source generation turned off — `AddGeneratedMaps()` simply emits calls to it. ### Localized titles The declared strings are attribute literals, so they cannot be translated on their own. Register an `IAppShortcutText` to resolve them at install time, when `CurrentUICulture` is known: ```csharp public class ResourceShortcutText : IAppShortcutText { public string GetTitle(string route, string declared) => AppResources.ResourceManager.GetString(declared) ?? declared; public string? GetSubtitle(string route, string? declared) => declared is null ? null : AppResources.ResourceManager.GetString(declared) ?? declared; } ``` ```csharp .UseShinyShell(x => x .AddGeneratedMaps() .UseShortcutText<ResourceShortcutText>() ) ``` The declared string becomes the resource key, with the literal as its own fallback. It applies to generated and hand-registered shortcuts alike. Installed shortcuts keep their text until pushed again, so after a language change call: ```csharp await appShortcuts.Refresh(); // IAppShortcuts ``` ### Diagnostics | Code | Severity | Meaning | |---|---|---| | **SHINY010** | Error | `Shortcut` set on a route with a required `[ShellProperty]` — use `AddAppShortcut(configure:)` | | **SHINY011** | Warning | More than four shortcuts — iOS silently drops the excess | | **SHINY012** | Error | A `Shortcut*` property set without `Shortcut` (the title), so nothing is declared | `AddAppShortcut` logs the SHINY011 equivalent at runtime, since hand-registered shortcuts get no compile-time check. --- ## AI Integration Shiny MAUI Shell's source generation produces metadata and navigation methods designed for AI tool calling via [Microsoft.Extensions.AI](https://www.nuget.org/packages/Microsoft.Extensions.AI). An AI chat client can discover your app's routes, understand their purpose, extract parameters from natural language, and navigate to the correct page — all with just two tools. ### How It Works 1. **Describe your routes** — Add `description` to `[ShellMap]` and `[ShellProperty]` to explain what each page does and what its parameters mean: ```csharp public enum WorkOrderPriority { Low, Medium, High, Urgent } [ShellMap<WorkOrderPage>(description: "Use when the user reports something broken, malfunctioning, or needing repair")] public partial class WorkOrderViewModel : ObservableObject { [ShellProperty("Summarize what is broken based on what the user said", required: true)] public string Description { get; set; } = string.Empty; [ShellProperty("Infer urgency from tone. Must be: Low, Medium, High, or Urgent", required: true)] public WorkOrderPriority Priority { get; set; } = WorkOrderPriority.Medium; } ``` 2. **Install `Microsoft.Extensions.AI`** — AI extensions are enabled by default when this package is referenced: ```bash dotnet add package Microsoft.Extensions.AI ``` 3. **Register AI tools in DI** — Use the generated `AddAiTools()` extension: ```csharp builder.UseShinyShell(x => x .AddGeneratedMaps() .AddAiTools() // registers AiMauiShellTools as singleton ); ``` 4. **Inject and use `AiMauiShellTools`** — The generated class provides `Prompt` and `Tools` properties: ```csharp public class ChatViewModel(AiMauiShellTools aiTools) { // Seed the system prompt with route info history.Add(new ChatMessage(ChatRole.System, aiTools.Prompt)); // Use ready-to-use AITool instances var options = new ChatOptions { Tools = [.. aiTools.Tools] }; var response = await chatClient.GetResponseAsync(history, options); } ``` The AI calls `GetAiToolApplicableGeneratedRoutes` to discover what pages exist and what they do, then calls `NavigateToRoute` with the appropriate route and parameters extracted from the user's message. `NavigateToRoute` dispatches to `NavigateTo<TViewModel>` with direct property setters — no string-based Shell navigation involved. String values from the AI are automatically converted to the target property type (`int`, `bool`, `double`, enums, `DateTime`, etc.). ### GeneratedRouteParameter Each parameter in the route info includes: | Field | Description | |:------|:------------| | `ParameterName` | The property name (used as key in `NavigateToRoute` args) | | `Description` | From `[ShellProperty("...")]` — tells the AI what this field means | | `TypeName` | CLR type (`string`, `int`, `bool`, etc.) — tells the AI what format to use | | `IsRequired` | Whether the AI must provide this value | ### Sample App — GitHub Copilot Authentication The sample application includes a working AI chat demo that authenticates via **GitHub Copilot** using the OAuth device flow. This lets anyone with a Copilot subscription test AI-driven navigation using their own account — no API keys to configure. The flow: 1. User taps **Login with GitHub** — the app requests a device code and opens `github.com/login/device` in the browser 2. User enters the displayed code to authorize 3. The app exchanges the GitHub token for a Copilot API token and creates an `IChatClient` via `Microsoft.Extensions.AI.OpenAI` (the Copilot API is OpenAI-compatible) 4. The chat injects `AiMauiShellTools` which provides `Prompt` and `Tools` for route discovery and navigation The relevant sample files: - `Sample/AI/ChatPage.xaml` — Chat UI using `Shiny.Maui.Controls.ChatView` - `Sample/AI/ChatViewModel.cs` — AI client setup and tool registration - `Sample/AI/GitHubCopilotAuthService.cs` — Device flow OAuth + token management - `Sample/AI/TestWorkOrderViewModel.cs` — AI-navigable work order form - `Sample/AI/ContactFormViewModel.cs` — AI-navigable contact form --- ## Custom Handlers Optional handlers that are **not registered by default**. Call `Register()` in your `MauiProgram.cs` to opt in. ### Disable Flyout Swipe Prevents the Shell flyout from opening via swipe gesture while keeping the hamburger button functional: ```csharp using Shiny.Handlers; // In MauiProgram.cs, before builder.Build() DisableShellFlyoutSwipeHandler.Register(); ``` | Platform | Behavior | |:---------|:---------| | Android | Locks the `DrawerLayout` to `LockModeLockedClosed` | | iOS / Mac Catalyst | Disables `UIPanGestureRecognizer` on the Shell view hierarchy | | Windows | No-op (Windows Shell has no swipe flyout) | ## Commercial Support Shipping this to production? [ShinySoft Technologies](https://shinysoft.biz), the company that builds and maintains the Shiny libraries, offers priority issue response, support agreements, architecture reviews and private office hours. See [Commercial Support](https://shinylib.net/foundation/support/?utm_source=github&utm_medium=readme#commercial-support) or [get in touch](https://shinysoft.biz/contact?utm_source=github&utm_medium=readme). Community support through GitHub issues and discussions stays free.

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shiny-maui-shell

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Generate .NET MAUI Shell pages, ViewModels, navigation, and source-generated routes using Shiny MAUI Shell

Quellsprache: Englisch

2026-10-10

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