before_after 3.0.0

A flutter package which makes it easier to display the difference between two images.

example/lib/main.dart

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

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(useMaterial3: true),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key}) : super(key: key);

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

class _MyHomePageState extends State<MyHomePage> {
  var value = 0.5;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.grey[300],
      appBar: AppBar(
        title: const Text('Before After'),
        centerTitle: true,
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Flexible(
              child: Padding(
                padding: const EdgeInsets.all(8.0),
                child: ClipRRect(
                  borderRadius: BorderRadius.circular(20),
                  child:
                  BeforeAfter(
                    value: value,
                    before: Image.asset('assets/after.png'),
                    after: Image.asset('assets/before.png'),
                    onValueChanged: (value) {
                      setState(() => this.value = value);
                    },
                  ),
                ),
              ),
            ),
            const SizedBox(height: 20),
            Flexible(
              child: Padding(
                padding: const EdgeInsets.all(8.0),
                child: ClipRRect(
                  borderRadius: BorderRadius.circular(20),
                  child: BeforeAfter(
                    value: value,
                    before: Image.asset('assets/after.jpg'),
                    after: Image.asset('assets/before.jpg'),
                    direction: SliderDirection.vertical,
                    onValueChanged: (value) {
                      setState(() => this.value = value);
                    },
                  ),
                ),
              ),
            ),
          ],
        ),
      ),
    );
  }
}