Allow Multiple Gestures without modifying child widgets

global_gestures_listener.dart

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

// Custom Gesture Recognizer.
// rejectGesture() is overridden. When a gesture is rejected, this is the function that is called. By default, it disposes of the
// Recognizer and runs clean up. However we modified it so that instead the Recognizer is disposed of, it is actually manually added.
// The result is instead you have one Recognizer winning the Arena, you have two. It is a win-win.
class AllowMultipleTapGesturesRecognizer extends TapGestureRecognizer {
  @override
  void rejectGesture(int pointer) {
    acceptGesture(pointer);
  }
}

class GlobalGesturesListener extends StatelessWidget {
  final Widget child;

  GlobalGesturesListener({required this.child});

  @override
  Widget build(BuildContext context) {
    return RawGestureDetector(
      gestures: {
        AllowMultipleTapGesturesRecognizer:
            GestureRecognizerFactoryWithHandlers<
                AllowMultipleTapGesturesRecognizer>(
          () => AllowMultipleTapGesturesRecognizer(),
          (AllowMultipleTapGesturesRecognizer instance) {
            instance.onTap =
                () => print('🔴 Global Gesture Listener Plugin DETECTED TAP');
          },
        ),
      },
      child: child,
    );
  }
}

main.dart

import 'package:flutter/material.dart';
import 'package:flutter_sandbox/global_gestures_listener_plugin/global_gestures_listener.dart';

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

class MyApp extends StatefulWidget {
  final String title = 'Flutter Sandbox App';

  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  int _counter = 0;

  void _doStuff() {
    print('🔵 Any child button DETECTED TAP');
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return GlobalGesturesListener(
      child: MaterialApp(
        title: 'Flutter Demo',
        home: Scaffold(
          appBar: AppBar(
            title: Text(widget.title),
          ),
          body: Center(
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                Text("Here is the result of the stuff you've done:"),
                Text(
                  '$_counter',
                  style: Theme.of(context).textTheme.headline4,
                ),
              ],
            ),
          ),
          floatingActionButton: FloatingActionButton(
            onPressed: _doStuff,
            tooltip: 'Do stuff...',
            child: Icon(Icons.science),
          ),
        ),
      ),
    );
  }
}