main.dart

import 'package:flutter/material.dart';

void main() => runApp(new CardsDemo());

List cards = ['Card A', 'Card B', 'Card C', 'Card D'];

class CustomCardItem extends StatefulWidget {
  final String card;
  CustomCardItem({this.card});
  @override
  CustomCardItemState createState() => new CustomCardItemState(card: card);
}

class CustomCardItemState extends State<CustomCardItem> {
  final String card;
  Key key = new Key('default');
  CustomCardItemState({this.card});
  initState() {
    super.initState();
    key = new Key(card);
  }

  @override
  Widget build(BuildContext context) {
    final ThemeData theme = Theme.of(context);
    final TextStyle descriptionStyle = theme.textTheme.subhead;
    return new SafeArea(
      top: false,
      bottom: false,
      child: new Dismissible(
        key: key,
        onDismissed: (DismissDirection dir) {
          cards.removeLast();
        },
        child: new Container(
          padding: const EdgeInsets.all(8.0),
          height: 280.0,
          child: new Card(
            child: new Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: <Widget>[
                new SizedBox(
                  height: 184.0,
                  child: new Stack(
                    children: <Widget>[
                      new Positioned.fill(
                        child: new Image.network(
                            'https://avatars3.githubusercontent.com/u/14101776?v=4'),
                      ),
                    ],
                  ),
                ),
                new Expanded(
                  child: new Padding(
                    padding: const EdgeInsets.fromLTRB(16.0, 16.0, 16.0, 0.0),
                    child: new DefaultTextStyle(
                      style: descriptionStyle,
                      child: new Column(
                        children: <Widget>[
                          new Padding(
                            padding: const EdgeInsets.only(bottom: 8.0),
                            child: new Text(
                              card,
                            ),
                          ),
                        ],
                      ),
                    ),
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}

class CardsDemo extends StatefulWidget {
  @override
  CardsDemoState createState() => new CardsDemoState();
}

class CardsDemoState extends State<CardsDemo> {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
        home: new Scaffold(
            appBar: new AppBar(title: const Text('Card Swipe Animation')),
            body: new Stack(
                children: cards.map((card) {
              return new Container(
                  child: new CustomCardItem(
                card: card,
              ));
            }).toList())));
  }
}