GestureDetector example 01

main.dart

import 'package:flutter/material.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Gestures'),
      debugShowCheckedModeBanner: false,
    );
  }
}

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

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _taps = 0;
  int _doubleTaps = 0;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body: Center(
        child: Container(
          margin: const EdgeInsets.symmetric(horizontal: 20),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            mainAxisSize: MainAxisSize.min,
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: <Widget>[
              GestureDetector(
                onTap: () {
                  _taps++;
                  setState(() {});
                },
                onDoubleTap: () {
                  _doubleTaps++;
                  setState(() {});
                },
                child: Card(
                  elevation: 10,
                  child: Container(
                    height: 100,
                  ),
                ),
              ),
              Text(
                '$_taps toques',
                style: Theme.of(context).textTheme.headlineMedium,
              ),
              Text(
                '$_doubleTaps doble toques',
                style: Theme.of(context).textTheme.headlineMedium,
              ),
            ],
          ),
        ),
      ),
    );
  }
}