Compose-like navigation with Decompose

Navigator.kt

@Composable
fun <T : Parcelable> Navigator(
    initialConfiguration: () -> T,
    configurationClass: KClass<out T>,
    content: @Composable Router<T>.(T) -> Unit
) {
    val lifecycle = getLifecycle()
    val stateKeeper = getStateKeeper()

    val context = remember { DefaultComponentContext(lifecycle = lifecycle, stateKeeper = stateKeeper) }

    val router =
        remember {
            val decomposeRouter =
                context.router(
                    initialConfiguration = initialConfiguration,
                    configurationClass = configurationClass,
                    componentFactory = { configuration, _ -> configuration }
                )

            object : Router<T>, com.arkivanov.decompose.Router<T, T> by decomposeRouter {}
        }

    val routerState by router.state.asState()
    router.content(routerState.activeChild.configuration)
}

@Composable
private fun getLifecycle(): Lifecycle {
    val lifecycle = remember { LifecycleRegistry() }
    onActive { lifecycle.resume() }
    onDispose { lifecycle.destroy() }

    return lifecycle
}

@Composable
private fun getStateKeeper(key: String = "state"): StateKeeper {
    val savedStateRegistry: UiSavedStateRegistry? = AmbientUiSavedStateRegistry.current

    val dispatcher =
        remember {
            StateKeeperDispatcher(savedStateRegistry?.consumeRestored(key) as ParcelableContainer?)
        }

    if (savedStateRegistry != null) {
        val stateProvider = dispatcher::save
        onActive { savedStateRegistry.registerProvider(key, stateProvider) }
        onDispose { savedStateRegistry.unregisterProvider(key, stateProvider) }
    }

    return dispatcher
}

interface Router<in T : Parcelable> {
    fun push(configuration: T)
    fun pop()
}

asState() unresolved , in line 24

asState() unresolved , in line 24

You have to add one of the Compose extension modules: https://github.com/arkivanov/Decompose#setup

Also please note, this is just a draft. Since Decompose is evolving, you may need to adjust the sample.

it said "Type 'State<TypeVariable(T)>' has no method 'getValue(Nothing?, KProperty<*>)' and thus it cannot serve as a delegate" , i know that is just a draft but i can't do navigate with documentation you provide to use decompose , can you help me with simple example to navigate between two screen

I am using this extension "com.arkivanov.decompose:extensions-compose-jetbrains:0.1.5"

it now work i update it to be val routerState = router.state.asState() instead of delegate
update it :)

It is a known issue: https://youtrack.jetbrains.com/issue/KT-39199
You need to manually import getValue extension function:
import com.arkivanov.decompose.extensions.compose.jetbrains.getValue