elevation property

double get elevation

@override
double get elevation => super.elevation ?? 1;

set elevation (dynamic v)

set elevation(dynamic v) {
  if (_elevation != null) {
    _elevation!.set(v);
  } else if (v != null) {
    _elevation = DoubleObservable(Binding.toKey(id, 'elevation'), v,
        scope: scope, listener: onPropertyChange);
  }
}