Container(
  height: 20,
  width: 100,
  child: TextFormField(
    maxLines: 1,
    decoration: InputDecoration(
      isDense: true,
      contentPadding: EdgeInsets.fromLTRB(5.0, 1.0, 5.0, 1.0),
    ),
    onChanged: (value) {
      print(value);
    },
  ),
);