rememberSceneState

SceneStateSample

@Suppress("unused")
@Sampled
@Composable
fun SceneStateSample() {
    val backStack = rememberSaveable { mutableStateListOf("a", "b") }
    val entries =
        rememberDecoratedNavEntries(backStack) { key -> NavEntry(key) { Text("Key = $key") } }
    val sceneState =
        rememberSceneState(
            entries,
            listOf(SinglePaneSceneStrategy()),
            onBack = { backStack.removeLastOrNull() },
        )
    val currentScene = sceneState.currentScene
    val navigationEventState =
        rememberNavigationEventState(
            currentInfo = SceneInfo(currentScene),
            backInfo = sceneState.previousScenes.map { SceneInfo(it) },
        )
    NavigationBackHandler(
        navigationEventState,
        isBackEnabled = currentScene.previousEntries.isNotEmpty(),
        onBackCompleted = {
            // Remove entries from the back stack until we've removed all popped entries
            repeat(entries.size - currentScene.previousEntries.size) {
                backStack.removeLastOrNull()
            }
        },
    )
    NavDisplay(sceneState, navigationEventState)
}