SemanticsData({@required int flags, @required int actions, @required String label, @required Rect rect, Matrix4 transform })

Creates a semantics data object.

The flags, actions, label, and Rect arguments must not be null.

Source 

SemanticsData({
  @required this.flags,
  @required this.actions,
  @required this.label,
  @required this.rect,
  this.transform
}) {
  assert(flags != null);
  assert(actions != null);
  assert(label != null);
  assert(rect != null);
}