Vertical Text widget for Flutter

Sideway text is possible using RotatedBox, which is enough for the text to correctly wrap as you’d expect.

Row(
  children: <Widget>[
    RotatedBox(
      quarterTurns: 1,
      child: Text(sample),
    ),
    Expanded(child: Text(sample)),
    RotatedBox(
      quarterTurns: -1,
      child: Text(sample),
    ),
  ],
),

Similarly, Flutter now supports inline widgets inside text. This can be used to rotate smileys inside a text.

RotatedBox(
  quarterTurns: 1,
  child: RichText(
    text: TextSpan(
      text: 'Hello World',
      style: DefaultTextStyle.of(context).style,
      children: [
        WidgetSpan(
          child: RotatedBox(quarterTurns: -1, child: Text('😃')),
        )
      ],
    ),
  ),
),