var idleTime = Date().time
    val fixedRateTimer = fixedRateTimer(name = "hello-timer", period = 1000) {
        if (Date().time > (idleTime + 1000)) {
            println("lock screen!")
        }
    }

override fun start(stage: Stage) {
        super.start(stage)
        stage.addEventFilter(InputEvent.ANY) {
            updateTimer()
        }

    }

private fun updateTimer() {
        idleTime = Date().time
    }