DayView.kt

class DayView : ImageView {
	private fun show() {
        when(viewState) {
            is ViewState.Skipped -> {
                setImageResource(notMetVector)
            }
            is ViewState.Met -> {
                setImageResource(metVector)
            }
            is ViewState.MetToday -> {
                startAnimation(metTodayAnim)
            }
            is ViewState.DidntMeetYetToday -> {
                setImageResource(notMetTodayVector)
            }
            is ViewState.Future -> {
                setImageResource(futureVector)
            }
        }
    }

	//...
}