backhandler-6.kt

@Composable
fun RootBackHandler(rootHandler: ScopedBackPressHandler, children: @Composable() () -> Unit) {
    val downstream = +memo { ScopedBackPressHandler() }
    val handleBackPressHere: () -> Boolean = { downstream.handle() }
    rootHandler.handlers.add(handleBackPressHere)
    +onDispose { rootHandler.handlers.remove(handleBackPressHere) }

    backPressHandler.Provider(value = downstream) {
        children()
    }
}