compose_rememberCoroutineScope_job_cancel.kt

@Composable
fun TimerScreen() {
    val scope = rememberCoroutineScope()
    var job: Job? by remember {
        mutableStateOf(null)
    }
    Column {
        Button(onClick = {
            job = scope.launch {
                try {
                    println("Timer started")
                    startTimer(5000) {
                        println("Timer ended")
                    }
                } catch (ex: Exception) {
                    println("timer cancelled")
                }
            }
        }) {
            Text("Start Timer")
        }

        Spacer(Modifier.height(20.dp))

        Button(onClick = {
            println("Cancelling timer")
            job?.cancel()
        }) {
            Text("Cancel Timer")
        }

    }
}