GestureDetector

sample.packages.flutter.lib.src.widgets.gesture_detector.142.

This example uses a [Container] that wraps a [GestureDetector] widget which detects a tap.

Since the [GestureDetector] does not have a child, it takes on the size of its parent, making the entire area of the surrounding [Container] clickable. When tapped, the [Container] turns yellow by setting the _color field. When tapped again, it goes back to white.

  
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 createState() => _MyStatefulWidgetState();
}

class _MyStatefulWidgetState extends State {
  Color _color = Colors.white;

  @override
  Widget build(BuildContext context) {
    return Container(
      color: _color,
      height: 200.0,
      width: 200.0,
      child: GestureDetector(
        onTap: () {
          setState(() {
            _color == Colors.yellow
                ? _color = Colors.white
                : _color = Colors.yellow;
          });
        },
      ),
    );
  }
}
  

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