https://github.com/flutter/flutter/issues/10623

main.dart

import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) => MaterialApp(
        home: MyHomePage(),
      );
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  TapGestureRecognizer tap(BuildContext context, String message) =>
      TapGestureRecognizer()
        ..onTap = () => Scaffold.of(context).showSnackBar(
              SnackBar(content: Text(message)),
            );

  @override
  Widget build(BuildContext context) => Scaffold(
        body: Builder(
          builder: (context) => Center(
            child: RichText(
              text: TextSpan(children: <TextSpan>[
                TextSpan(
                  children: [TextSpan(text: 'left')],
                  recognizer: tap(context, "left"),
                  style: const TextStyle(
                    color: Color.fromRGBO(255, 0, 0, 1),
                    fontSize: 50,
                  ),
                ),
                const TextSpan(
                  text: 'center',
                  style: const TextStyle(
                    color: Color.fromRGBO(0, 255, 0, 1),
                    fontSize: 50,
                  ),
                ),
                TextSpan(
                  text: 'right',
                  recognizer: tap(context, "right"),
                  style: const TextStyle(
                    color: Color.fromRGBO(0, 0, 255, 1),
                    fontSize: 50,
                  ),
                ),
              ]),
            ),
          ),
        ),
      );
}