ComposeHints

HintController.kt

@Stable
class HintController internal constructor() {

    private var queue = mutableStateListOf<HintAnchorState>()

    internal val hint: HintAnchorState? get() = queue.firstOrNull()

    private val pendingRequests = mutableMapOf<HintAnchorState, Continuation<Unit>>()

    suspend fun show(hint: HintAnchorState) {
        suspendCoroutine { continuation ->
            pendingRequests[hint] = continuation
            queue.add(hint)
        }
    }

    suspend fun show(vararg hint: HintAnchorState) {
        show(hint.toList())
    }

    suspend fun show(hints: List<HintAnchorState>) {
        suspendCoroutine { continuation ->
            pendingRequests[hints.last()] = continuation
            queue.addAll(hints)
        }
    }

    internal fun onDismissed(hint: HintAnchorState) {
        pendingRequests[hint]?.let { continuation ->
            continuation.resume(Unit)
            pendingRequests.remove(hint)
        }
        queue.remove(hint)
    }

    fun dismiss() {
        pendingRequests.values
            .forEach { continuation ->
                continuation.resumeWithException(CancellationException("Hint was dismissed"))
            }
        pendingRequests.clear()
        queue.clear()
    }
}