performLayout method

@override Size performLayout(BoxConstraints constraints)

Hook for subclasses to perform layout within the given constraints.

Implementation

@override
Size performLayout(BoxConstraints constraints) {
  final cb = widget as ConstrainedBox;
  final childConstraints = constraints.enforce(cb.constraints);
  if (childElement != null) {
    final size = childElement!.layout(childConstraints);
    childElement!.relativeOffset = Offset.zero;
    return size;
  }
  return childConstraints.constrain(Size.zero);
}