1. override
String toString([String prefix = '', String prefixIndent ])

Returns a string representation of this object.

Every line of the output should be prefixed by prefix.

If indentPrefix is non-null, then the description can be further split into sublines, and each subline should be prefixed with indentPrefix (rather that prefix). This is used, for example, by BoxDecoration for the otherwise quite verbose BoxShadow descriptions.

Source 

@override
String toString([String prefix = '', String prefixIndent ]) {
  final String extra = _inTransition ? ', transition $_position:$_opacity' : '';
  if (swatch == null)
    return '$prefix$runtimeType(null, $style$extra)';
  return '$prefix$runtimeType(${swatch[_lightShade]}/${swatch[_darkShade]} on $textColor, $style$extra)';
}