flutter-devs

class Data with ChangeNotifier {
  bool successDrop;
  List<CardItem> items;
  CardItem acceptedData;

  Data() {
    successDrop = false;

    items = Constants.initializeList(items);
  }

flutter-devs

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(APP_BAR_TITLE),
      ),
      floatingActionButton: FloatingActionButton.extended(
        onPressed: () {
          Provider.of<Data>(context).initializeDraggableList();

flutter-devs

class CardStackWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Stack(
      alignment: Alignment.center,
      children: cardItems(context),
    );
  }

  List<Widget> cardItems(BuildContext context) {

flutter-devs

class DraggableWidget extends StatelessWidget {
  DraggableWidget({
    Key key,
    @required this.i,
  }) : super(key: key);

  final int i;

  CardItem item;

flutter-devs

class DragTargetWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return DragTarget(onWillAccept: (data) {
      return true;
    }, onAccept: (CardItem data) {
      if (Provider.of<Data>(context).itemsList.length >= 1) {
        Provider.of<Data>(context).removeLastItem();
        Provider.of<Data>(context).changeSuccessDrop(true);
        Provider.of<Data>(context).changeAcceptedData(data);

flutter-devs

class HomeScreen extends StatefulWidget {
  @override
  _HomeScreenState createState() => _HomeScreenState();
}

class _HomeScreenState extends State<HomeScreen> with TickerProviderStateMixin {
  
Animation _arrowAnimation;
AnimationController _arrowAnimationController;  
  

flutter-devs

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Example Animations'),
      ),
      body: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          firstChild(),

flutter-devs

  Widget firstChild() {
    return Row(
      mainAxisAlignment: MainAxisAlignment.spaceAround,
      children: <Widget>[
        AnimatedBuilder(
          animation: _arrowAnimationController,
          builder: (context, child) => Transform.rotate(
                angle: _arrowAnimation.value,
                child: Icon(
                  Icons.expand_more,

flutter-devs

class HomeScreen extends StatefulWidget {
  @override
  _HomeScreenState createState() => _HomeScreenState();
}

class _HomeScreenState extends State<HomeScreen> with TickerProviderStateMixin {
  
Animation _arrowAnimation, _heartAnimation;
AnimationController _arrowAnimationController, _heartAnimationController;  
  

flutter-devs

 @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Example Animations'),
      ),
      body: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          firstChild(),