Counter example

readme.md

Counter example

Created with <3 with dartpad.dev.

main.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'IndexedStack Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'IndexedStack'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  final String title;

  const MyHomePage({
    Key? key,
    required this.title,
  }) : super(key: key);

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

class _MyHomePageState extends State<MyHomePage> {
  int stackIndex = 0;
  
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: GestureDetector(
        onTap: () {
          setState(() {
            stackIndex = stackIndex < 2 ? stackIndex + 1 : 0;
          });
        },
        onLongPress: () {
          setState(() {
            stackIndex = stackIndex > 0 ? stackIndex - 1 : 2;
          });
        },
        child: IndexedStack(
          index: stackIndex,
          children: [
            Container(
              color: Colors.red,
            ),
            Container(
              color: Colors.green,
            ),
            Container(
              color: Colors.blue,
            ),
          ],
        ),
      )
    );
  }
}