import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo Application', theme: ThemeData(
      primarySwatch: Colors.green,),
      home: MyHomePage(),
    );
  }
}
class MyHomePage extends StatefulWidget {
  @override
  MyHomePageState createState() => new MyHomePageState();
}

class MyHomePageState extends State {
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text('Gestures Example'),
        centerTitle: true,
      ),
      body: new Center(child: GestureDetector(
          onTap: () {
            print('Box Clicked');
          },
          child: Container(
            height: 60.0,
            width: 120.0,
            padding: EdgeInsets.all(10.0),
            decoration: BoxDecoration(
              color: Colors.blueGrey,
              borderRadius: BorderRadius.circular(15.0),
            ),
            child: Center(child: Text('Click Me')),
          )
      )),
    );
  }
}

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

//It is the entry point for your Flutter app.
void main() {
  runApp(
    MaterialApp(
      title: 'Multiple Gestures Demo',
      home: Scaffold(
        appBar: AppBar(
          title: Text('Multiple Gestures Demo'),
        ),
        body: DemoApp(),
      ),
    ),
  );
}

class DemoApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return RawGestureDetector(
      gestures: {
        AllowMultipleGestureRecognizer: GestureRecognizerFactoryWithHandlers<
            AllowMultipleGestureRecognizer>(
              () => AllowMultipleGestureRecognizer(),
              (AllowMultipleGestureRecognizer instance) {
            instance.onTap = () => print('It is the parent container gesture');
          },
        )
      },
      behavior: HitTestBehavior.opaque,
      //Parent Container
      child: Container(
        color: Colors.green,
        child: Center(
          //Now, wraps the second container in RawGestureDetector
          child: RawGestureDetector(
            gestures: {
              AllowMultipleGestureRecognizer:
              GestureRecognizerFactoryWithHandlers<
                  AllowMultipleGestureRecognizer>(
                    () => AllowMultipleGestureRecognizer(),  //constructor
                    (AllowMultipleGestureRecognizer instance) {  //initializer
                  instance.onTap = () => print('It is the nested container');
                },
              )
            },
            //Creates the nested container within the first.
            child: Container(
              color: Colors.deepOrange,
              width: 250.0,
              height: 350.0,
            ),
          ),
        ),
      ),
    );
  }
}

class AllowMultipleGestureRecognizer extends TapGestureRecognizer {
  @override
  void rejectGesture(int pointer) {
    acceptGesture(pointer);
  }
}

It is the nested container.
It is the parent container gesture.