layout method Null safety

  1. @override
void layout(
  1. Context context,
  2. BoxConstraints constraints,
  3. {bool parentUsesSize = false}
)
override

First widget pass to calculate the children layout and bounding box

Implementation

@override
void layout(Context context, BoxConstraints constraints,
    {bool parentUsesSize = false}) {
  if (child != null) {
    child!.layout(context, constraints, parentUsesSize: parentUsesSize);
    assert(child!.box != null);
    box = child!.box;
  } else {
    box = PdfRect.fromPoints(PdfPoint.zero, constraints.smallest);
  }
}