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🔆 Compose Multiplatform Navigation library - 🌸 Pragmatic, type safety navigation for Compose Multiplatform. Based on Freeletics Khonshu Navigation. ♥️ ViewModel, SavedStateHandle, Lifecycle, Multi-Backstacks, Transitions, Back-press handling, and more...

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# solivagant 🔆

## [🔴 NOT MAINTAINED] 🔆 Compose Multiplatform Navigation library - 🌸 Pragmatic, type safety navigation for Compose Multiplatform. Based on [Freeletics Khonshu Navigation](https://freeletics.github.io/khonshu/navigation/get-started/). ♥️ ViewModel, SavedStateHandle, Lifecycle, Multi-Backstacks, Transitions, Back-press handling, and more...

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![badge][badge-watchos]
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- Integrates with `Jetbrains Compose Multiplatform` seamlessly and easily.

- Integrates with [**kmp-viewmodel**](https://github.com/hoc081098/kmp-viewmodel) library seamlessly and smoothly
  - Stack entry scoped `ViewModel`, exists as long as the
    stack entry is on the navigation stack, including the configuration changes on `Android`.

- Supports `SavedStateHandle`, used to save and restore data over configuration changes
    or process death on `Android`.

- The **navigation stack state** is saved and restored automatically over configuration changes and process
  death on `Android`.
  On other platforms, you can use a support class provided by this library to store the navigation stack state
  as long as you want.

- **Type safety navigation**, easy to pass data between destinations.
  No more `String` route and dynamic query parameters.
  The `Solivagant` library uses `NavRoute`s and `NavRoot`s to define routes that can be navigated to.
  Arguments can be defined as part of the route (a.ka. properties of the route class) and are type safe.
  Each `NavRoute` and `NavRoot` has a corresponding `NavDestination` that describes the UI (a.k.a `@Composable`) of the
  route.

- Supports **Multi-Backstacks**, this is most commonly used in apps that use bottom navigation to
  separate the back stack of each tab.
  See [Freeletics Khonshu Navigation - Multiple back stacks](https://freeletics.github.io/khonshu/navigation/back-stacks/)
  for more details.

- Supports `LifecycleOwner`, `Lifecycle` events and states, similar to `AndroidX Lifecycle` library.

> [!WARNING]
> **This library is no longer maintained.**
>
> Development has stopped. No new features, bug fixes, or dependency updates will be published.
> The repository is preserved as a reference and for existing users who wish to fork or study the code.
>
> **For new projects**, use [Navigation 3](https://developer.android.com/guide/navigation/navigation-3)
> (Android/Compose) or the official [JetBrains Compose Multiplatform](https://www.jetbrains.com/compose-multiplatform/)
> navigation solution when it becomes available on all platforms.
>
> The architectural patterns and design decisions from this library are documented in
> [`docs/`](docs/README.md) and are worth reading regardless of which navigation library you use.

## Credits

- Most of the code in `solivagant-khonshu-navigation-core` and `solivagant-navigation` libraries is
  taken from [Freeletics Khonshu Navigation](https://freeletics.github.io/khonshu/navigation/get-started/),
  and ported to `Kotlin Multiplatform` and `Compose Multiplatform`.

- The `solivagant-lifecycle` library is inspired
  by [Essenty Lifecycle](https://github.com/arkivanov/Essenty?tab=readme-ov-file#lifecycle),
  and [AndroidX Lifecycle](https://developer.android.com/jetpack/androidx/releases/lifecycle).

## Author: [Petrus Nguyễn Thái Học](https://github.com/hoc081098)

Liked some of my work? Buy me a coffee (or more likely a beer)

## Docs & Installation

### **0.x release** docs: https://hoc081098.github.io/solivagant/docs/0.x

### Snapshot docs: https://hoc081098.github.io/solivagant/docs/latest

### Installation

```kotlin
allprojects {
  repositories {
    [...]
    mavenCentral()
  }
}
```

```kotlin
implementation("io.github.hoc081098:solivagant-navigation:0.5.0")
```

### Snapshot

<details>
  <summary>Snapshots of the development version are available in Sonatype's snapshots repository.</summary>

```kotlin
allprojects {
  repositories {
    ...
    maven(url = "https://s01.oss.sonatype.org/content/repositories/snapshots/")
  }
}

dependencies {
  implementation("io.github.hoc081098:solivagant-navigation:0.5.1-SNAPSHOT")
}
```

</details>

## Getting started

The library is ported from `Freeletics Khonshu Navigation` library, so the concepts is similar.
You can read the [Freeletics Khonshu Navigation](https://freeletics.github.io/khonshu/navigation/get-started/) to
understand
the concepts.

👉 Full samples are available [here](#Samples).

### 1. Create `NavRoot`s, `NavRoute`s

```kotlin
@Immutable
@Parcelize
data object StartScreenRoute : NavRoot

@Immutable
@Parcelize
data object SearchProductScreenRoute : NavRoute
```

> [!NOTE]
> `@Parcelize` is provided by `kmp-viewmodel-savedstate` library.
> See [kmp-viewmodel-savedstate](https://github.com/hoc081098/kmp-viewmodel?tab=readme-ov-file#2-kmp-viewmodel-savedstate-library) for more details.

### 2. Create `NavDestination`s along with `Composable`s and `ViewModel`s

###### StartScreen.kt

```kotlin

@JvmField
val StartScreenDestination: NavDestination =
  ScreenDestination<StartScreenRoute> { StartScreen() }

@Composable
internal fun StartScreen(
  modifier: Modifier = Modifier,
  // kmpViewModel or kojectKmpViewModel can be used instead.
  viewModel: StartViewModel = koinKmpViewModel(),
) {
  // UI Composable
}

internal class StartViewModel(
  // used to trigger navigation actions from outside the view layer (e.g. from a ViewModel).
  // Usually, it is singleton object, or the host Activity retained scope.
  private val navigator: NavEventNavigator,
) : ViewModel() {
  internal fun navigateToProductsScreen() = navigator.navigateTo(ProductsScreenRoute)
  internal fun navigateToSearchProductScreen() = navigator.navigateTo(SearchProductScreenRoute)
}
```

###### SearchProductScreen.kt

```kotlin
@JvmField
val SearchProductScreenDestination: NavDestination =
  ScreenDestination<SearchProductScreenRoute> { SearchProductsScreen() }

@Composable
internal fun SearchProductsScreen(
  modifier: Modifier = Modifier,
  // kmpViewModel or kojectKmpViewModel can be used instead.
  viewModel: SearchProductsViewModel = koinKmpViewModel<SearchProductsViewModel>(),
) {
  // UI Composable
}

internal class SearchProductsViewModel(
  private val searchProducts: SearchProducts,
  private val savedStateHandle: SavedStateHandle,
  // used to trigger navigation actions from outside the view layer (e.g. from a ViewModel).
  // Usually, it is singleton object, or the host Activity retained scope.
  private val navigator: NavEventNavigator,
) : ViewModel() {
  fun navigateToProductDetail(id: Int) {
    navigator.navigateTo(ProductDetailScreenRoute(id))
  }
}
```

### 3. Setup

#### 3.1. NavHost

Gather all `NavDestination`s in a set and use `NavEventNavigator` to trigger navigation actions.

###### MyAwesomeApp.kt

```kotlin
@Stable
private val AllDestinations: ImmutableSet<NavDestination> = persistentSetOf(
  StartScreenDestination,
  SearchProductScreenDestination,
  // and more ...
)

@Composable
fun MyAwesomeApp(
  // used to trigger navigation actions from outside the view layer (e.g. from a ViewModel).
  // Usually, it is singleton object, or the host Activity retained scope.
  navigator: NavEventNavigator = koinInject(),
  modifier: Modifier = Modifier,
) {
  // BaseRoute is the parent interface of NavRoute and NavRoot.
  // It implements Parcelable so that it can be used with rememberSavable.
  var currentRoute: BaseRoute? by rememberSavable { mutableStateOf(null) }

NavHost(
    modifier = modifier,
    // route to the screen that should be shown initially
    startRoute = StartScreenRoute,
    // should contain all destinations that can be navigated to
    destinations = AllDestinations,
    // when passing a NavEventNavigator to NavHost, NavHost will take care of setting up the navigator by calling `NavigationSetup(navigator)`
    navEventNavigator = navigator,
    destinationChangedCallback = { currentRoute = it },
  )
}
```

> [!IMPORTANT]
> When passing a `NavEventNavigator` to `NavHost` composable, the NavHost will take care of setting up the navigator by calling `NavigationSetup(navigator)`.
>
> If you don't pass a "global" `NavEventNavigator` to `NavHost` composable, make sure there are property calls to `NavigationSetup(navigator)`.
> For example, we can call `NavigationSetup(navigator)` in each destination composable.
>
> ```kotlin
> @JvmField
> val StartScreenDestination: NavDestination = ScreenDestination<StartScreenRoute> {
>   NavigationSetup(navigator = koinInject())
>   StartScreen()
> }
>
> @JvmField
> val SearchProductScreenDestination: NavDestination = ScreenDestination<SearchProductScreenRoute> {
>   NavigationSetup(navigator = koinInject())
>   SearchProductsScreen()
> }
> ```
>
> 👉 Check out [scoped navigator sample](https://github.com/hoc081098/solivagant/blob/88e75468659fa3185edc47ef6b043ca86aaeee16/samples/simple/shared/src/commonMain/kotlin/com/hoc081098/solivagant/sample/simple/ui/detail/DetailNavigator.kt#L17C7-L17C22) for more information.

#### 3.2. Android

To display `MyAwesomeApp` on `Android`, use `setContent` in `Activity` / `Fragment`.

###### MainActivity.kt

```kotlin
class MainActivity : ComponentActivity() {
  override fun onCreate(savedInstanceState: Bundle) {
    super.onCreate()

// navigator can be retrieved from the DI container, such as Koin, Dagger Hilt, etc...
    setContent {
      MyAwesomeApp()
    }
  }
}
```

#### 3.3. Desktop

To display `MyAwesomeApp` on `Desktop`, use `androidx.compose.ui.window.application` and `Window` composable:

###### main.kt

```kotlin
fun main() {
  val lifecycleRegistry = LifecycleRegistry()
  val savedStateSupport = SavedStateSupport()

application {
    val windowState = rememberWindowState()
    val lifecycleOwner = rememberLifecycleOwner(lifecycleRegistry)
    LifecycleControllerEffect(
      lifecycleRegistry = lifecycleRegistry,
      windowState = windowState,
    )

savedStateSupport.ClearOnDispose()

Window(
      onCloseRequest = ::exitApplication,
      title = "Solivagant sample",
      state = windowState,
    ) {
      LifecycleOwnerProvider(lifecycleOwner) {
        // navigator can be retrieved from the DI container, such as Koin, Koject, etc...
        savedStateSupport.ProvideCompositionLocals { MyAwesomeApp() }
      }
    }
  }
}
```

> [!TIP]
> For more information please check out [Desktop sample main.kt](https://github.com/hoc081098/solivagant/blob/2eb1ef4beee875d63aaa882f7198cc738638ad75/samples/sample/desktop/src/commonMain/kotlin/com/hoc081098/solivagant/sample/main.kt#L18-L49)

#### 3.4. iOS / tvOS / watchOS

To display `MyAwesomeApp` on `iOS/tvOS/watchOS`, use `ComposeUIViewController` (Kotlin - iosMain SourceSet) and `UIViewControllerRepresentable` (Swift - native code):

###### MainViewController.kt

```kotlin
val AppLifecycleOwner by lazy { AppLifecycleOwner() }

fun MainViewController(savedStateSupport: SavedStateSupport): UIViewController {
  val lifecycleOwnerUIVcDelegate =
    LifecycleOwnerComposeUIViewControllerDelegate(hostLifecycleOwner = AppLifecycleOwner)
      .apply { bindTo(savedStateSupport) }
      .apply { lifecycle.subscribe(LifecycleObserver) }

return ComposeUIViewController(
    configure = { delegate = lifecycleOwnerUIVcDelegate },
  ) {
    LifecycleOwnerProvider(lifecycleOwnerUIVcDelegate) {
      savedStateSupport.ProvideCompositionLocals { MyAwesomeApp() }
    }
  }
}
```

###### ComposeView.swift

```swift
private struct ComposeView: UIViewControllerRepresentable {
  let savedStateSupport: NavigationSavedStateSupport

func makeUIViewController(context: Context) -> UIViewController {
    MainViewControllerKt.MainViewController(savedStateSupport: savedStateSupport)
  }

func updateUIViewController(_ uiViewController: UIViewController, context: Context) { }
}

private class ComposeViewViewModel: ObservableObject {
  let savedStateSupport = NavigationSavedStateSupport()
  deinit {
    self.savedStateSupport.clear()
  }
}

struct ComposeViewContainer: View {
  @StateObject private var viewModel = ComposeViewViewModel()

var body: some View {
    ComposeView(savedStateSupport: viewModel.savedStateSupport)
      .ignoresSafeArea(.keyboard) // Compose has own keyboard handler
  }
}
```

> [!TIP]
> For more information please check out [iOS sample MainViewController.kt](https://github.com/hoc081098/solivagant/blob/master/samples/sample/shared/src/iosMain/kotlin/com/hoc081098/solivagant/sample/MainViewController.kt)
> and [iosApp sample ComposeView.swift](https://github.com/hoc081098/solivagant/blob/master/samples/sample/iosApp/iosApp/ComposeView.swift)

### 4. Use `NavEventNavigator` in `ViewModel` s / `@Composable` s to trigger navigation actions

```kotlin
// navigate to the destination that the given route leads to
navigator.navigateTo(DetailScreenRoute("some-id"))
// navigate up in the hierarchy
navigator.navigateUp()
// navigate to the previous destination in the backstack
navigator.navigateBack()
// navigate back to the destination belonging to the referenced route and remove all destinations
// in between from the back stack, depending on inclusive the destination
navigator.navigateBackTo<MainScreenRoute>(inclusive = false)
```

## Samples

- [Complete sample - Products app](https://github.com/hoc081098/solivagant/tree/master/samples/sample): a complete sample
  that demonstrates how to use `solivagant-navigation` in `Compose Multiplatform (Android, Desktop, iOS)`
  - `solivagant-navigation` for navigation in Compose Multiplatform.
  - `kmp-viewmodel` to share `ViewModel` and `SavedStateHandle`.
  - `Koin DI`.

###### Desktop

https://github.com/user-attachments/assets/8b2d806f-3650-47ed-96a2-d9bc72342d25

- [Simple sample - Multibackstacks sample](https://github.com/hoc081098/solivagant/tree/master/samples/simple): a simple sample
  that demonstrates how to use `solivagant-navigation` in `Compose Multiplatform (Android, Desktop, iOS)` to
  switch between tabs (bottom navigation), but can keep the back stack state of each tab.
  Basically, it's a **multi-backstack** demo sample.

###### Desktop
  
    https://github.com/user-attachments/assets/300d7153-ccc0-49b3-a272-ff4f22f66e03

- [Compose Multiplatform KmpViewModel KMM Unsplash Sample](https://github.com/hoc081098/Compose-Multiplatform-KmpViewModel-KMM-Unsplash-Sample): A KMP template of the Unsplash App using Compose multiplatform for Android, Desktop, iOS. Share everything including data, domain, presentation, and UI.

- [Compose Multiplatform Todo solivagant Sample](https://github.com/hoc081098/Compose-Multiplatform-Todo-solivagant-Sample): A KMP template of the Todo App using Compose multiplatform for Android, Desktop, iOS and Web. Share everything including data, domain, presentation, and UI.

- [Solivagant Wasm Sample](https://github.com/hoc081098/solivagant/tree/master/samples/solivagant-wasm-sample).

- [Kotlin Multiplatform app template with shared UI, using solivagant-navigation](https://github.com/hoc081098/KMP-App-Template-solivagant).

## Roadmap

- [ ] Add more tests
- [x] Add more samples
- [ ] Add docs
- [x] Review supported targets
- [ ] Polish and improve the implementation and the public API
- [x] Support transition when navigating (since [0.1.0](https://github.com/hoc081098/solivagant/releases/tag/0.1.0)).
- [x] Support more targets such as wasm, watchOS, tvOS, etc... (since [0.2.0](https://github.com/hoc081098/solivagant/releases/tag/0.2.0)).

## 🔴 Not maintained

This library is **no longer maintained**. No new releases, bug fixes, or dependency updates are planned.

The repository remains public for reference. See [`docs/`](docs/README.md) for a full retrospective,
architectural patterns worth keeping, and migration guidance toward modern official APIs.

## License

```license
                                 Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/
```

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