childExtent property Null safety

double childExtent

The dimension of the child in the main axis.

Implementation

@protected
double get childExtent {
  if (child == null)
    return 0.0;
  assert(child!.hasSize);
  assert(constraints.axis != null);
  switch (constraints.axis) {
    case Axis.vertical:
      return child!.size.height;
    case Axis.horizontal:
      return child!.size.width;
  }
}