flutter_flutter/examples/api/lib/widgets/linked_text/linked_text.1.dart

// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'package:flutter/material.dart';

// This example demonstrates highlighting and linking Twitter handles.

void main() {
  runApp(const LinkedTextApp());
}

class LinkedTextApp extends StatelessWidget {
  const LinkedTextApp({
    super.key,
  });

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Link Twitter Handle Demo'),
    );
  }
}

class MyHomePage extends StatelessWidget {
  MyHomePage({
    super.key,
    required this.title
  });

  final String title;
  static const String _text = 'Please check out @FlutterDev on Twitter for the latest.';

  void _handleTapTwitterHandle(BuildContext context, String linkText) {
    final String handleWithoutAt = linkText.substring(1);
    final String twitterUriString = 'https://www.twitter.com/$handleWithoutAt';
    final Uri? uri = Uri.tryParse(twitterUriString);
    if (uri == null) {
      throw Exception('Failed to parse $twitterUriString.');
    }

    // A package like url_launcher would be useful for actually opening the URL
    // here instead of just showing a dialog.
    Navigator.of(context).push(
      DialogRoute<void>(
        context: context,
        builder: (BuildContext context) => AlertDialog(title: Text('You tapped: $uri')),
      ),
    );
  }

  final RegExp _twitterHandleRegExp = RegExp(r'@[a-zA-Z0-9]{4,15}');

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(title),
      ),
      body: Center(
        child: Builder(
          builder: (BuildContext context) {
            return SelectionArea(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: <Widget>[
                  LinkedText.regExp(
                    text: _text,
                    regExp: _twitterHandleRegExp,
                    onTap: (String twitterHandleString) => _handleTapTwitterHandle(context, twitterHandleString),
                  ),
                ],
              ),
            );
          },
        ),
      ),
    );
  }
}