How can I get the size of the Text widget in Flutter

My apologies.
This is not a direct answer on the topic’s question!
But If someone needs to get the size of a Text widget — this method can help. It helped me in creation of custom menu widget.

class TextSized extends StatelessWidget {
  const TextSized({Key key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final String text = "Text in one line";
    final TextStyle textStyle = TextStyle(
      fontSize: 30,
      color: Colors.white,
    );
    final Size txtSize = _textSize(text, textStyle);

    // This kind of use - meaningless. It's just an example.
    return Container(
      color: Colors.blueGrey,
      width: txtSize.width,
      height: txtSize.height,
      child: Text(
        text,
        style: textStyle,
        softWrap: false,
        overflow: TextOverflow.clip,
        maxLines: 1,
      ),
    );
  }

  // Here it is!
  Size _textSize(String text, TextStyle style) {
    final TextPainter textPainter = TextPainter(
        text: TextSpan(text: text, style: style), maxLines: 1, textDirection: TextDirection.ltr)
      ..layout(minWidth: 0, maxWidth: double.infinity);
    return textPainter.size;
  }
}