func (d ScrollDirection) String() string {
	switch d {
	case Vertical:
		return directionVertical
	case Horizontal:
		return directionHorizontal
	case Both:
		return directionBoth
	default:
		return directionUnknown
	}
}

func (v ScrollbarVisibility) String() string {
	switch v {
	case ScrollbarAuto:
		return visibilityAuto
	case ScrollbarAlways:
		return visibilityAlways
	case ScrollbarNever:
		return visibilityNever
	default:
		return visibilityUnknown
	}
}