shape property Null safety

OutlinedBorder? shape

The OutlinedBorder of the scrollbar's thumb.

Only one of radius and shape may be specified. For a rounded rectangle, it's simplest to just specify radius. By default, the scrollbar thumb's shape is a simple rectangle.

If shape is specified, the thumb will take the shape of the passed OutlinedBorder and fill itself with color (or grey if it is unspecified).


OutlinedBorder? get shape => _shape;
void shape=(OutlinedBorder? value)


set shape(OutlinedBorder? value){
  assert(radius == null || value == null);
  if(shape == value) {

  _shape = value;