paintExtentOf method Null safety

  1. @protected
double paintExtentOf (
  1. RenderBox child

Returns the dimension of the given child in the main axis, as given by the child's RenderBox.size property. This is only valid after layout.


double paintExtentOf(RenderBox child) {
  assert(child != null);
  switch (constraints.axis) {
    case Axis.horizontal:
      return child.size.width;
    case Axis.vertical:
      return child.size.height;