examples/api/lib/widgets/gesture_detector/gesture_detector.0.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.

// Flutter code sample for GestureDetector

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  static const String _title = 'Flutter Code Sample';

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      title: _title,
      home: MyStatefulWidget(),
    );
  }
}

class MyStatefulWidget extends StatefulWidget {
  const MyStatefulWidget({Key? key}) : super(key: key);

  @override
  State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}

class _MyStatefulWidgetState extends State<MyStatefulWidget> {
  bool _lightIsOn = false;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        alignment: FractionalOffset.center,
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Padding(
              padding: const EdgeInsets.all(8.0),
              child: Icon(
                Icons.lightbulb_outline,
                color: _lightIsOn ? Colors.yellow.shade600 : Colors.black,
                size: 60,
              ),
            ),
            GestureDetector(
              onTap: () {
                setState(() {
                  // Toggle light when tapped.
                  _lightIsOn = !_lightIsOn;
                });
              },
              child: Container(
                color: Colors.yellow.shade600,
                padding: const EdgeInsets.all(8),
                // Change button text when light changes state.
                child: Text(_lightIsOn ? 'TURN LIGHT OFF' : 'TURN LIGHT ON'),
              ),
            ),
          ],
        ),
      ),
    );
  }
}