adoptChild method

@override void adoptChild(RenderObject child)

Add a child to this render object

Implementation

@override
void adoptChild(RenderObject child) {
  final current = _singleRenderObjectChild(this);
  if (current != null && !identical(current, child)) {
    throw StateError(
      '$runtimeType already has a different single render child.',
    );
  }
  setChild(child);
}