1. override
String toString()

Returns a string representation of this object.

Source 

@override
String toString() {
  String annotation = isNormalized ? '' : '; NOT NORMALIZED';
  if (minWidth == double.INFINITY && minHeight == double.INFINITY)
    return 'BoxConstraints(biggest$annotation)';
  if (minWidth == 0 && maxWidth == double.INFINITY &&
      minHeight == 0 && maxHeight == double.INFINITY)
    return 'BoxConstraints(unconstrained$annotation)';
  String describe(double min, double max, String dim) {
    if (min == max)
      return '$dim=${min.toStringAsFixed(1)}';
    return '${min.toStringAsFixed(1)}<=$dim<=${max.toStringAsFixed(1)}';
  }
  final String width = describe(minWidth, maxWidth, 'w');
  final String height = describe(minHeight, maxHeight, 'h');
  return 'BoxConstraints($width, $height$annotation)';
}