dart - How do I auto scale down a font in a Text widget to fit the max number of lines?

Question

I'm trying to use BoxFit.scaleDown in a FittedBox's fit property to scale the font down in a Text widget to accommodate strings of varying length.

However, the below code will scale down the entire string and make it fit on one line, For the below example, I would like the font scaled down so that the string can fit on two lines (per maxLines property of the Text widget).

import 'package:flutter/material.dart';

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Multi-Line Label Demo',
      theme: new ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: new MyHomePage(title: 'Multi-Line Label Demo'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => new _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    final textStyle = const TextStyle(fontSize: 28.0);
    final text =
        'Lorem Ipsum is simply dummy text of the printing and typesetting'
        'industry. Lorem Ipsum has been the industry's standard dummy text'
        'ever since the 1500s, when an unknown printer took a galley of type'
        'and scrambled it to make a type specimen book.';
    return new Scaffold(
      appBar: new AppBar(
        title: new Text(widget.title),
      ),
      body: new Center(
        child: new Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            new FittedBox(
              fit: BoxFit.scaleDown,
              child: new Text(
                text,
                maxLines: 2,
                style: textStyle,
                textAlign: TextAlign.center,
              ),
            ),
          ],
        ),
      ),
    );
  }
}

Answer 1

An easy drop-in solution is to use FittedBox with fit: BoxFit.scaleDown:

Container(
  width: 100.0,
  child: FittedBox(
    fit: BoxFit.scaleDown,
    // Optionally apply `alignment` to position the text inside the box:
    //alignment: Alignment.topRight,
    child: SizedBox(
      child: Text('$1,299.99'),
  )
)