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

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

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

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

  final int i;

  CardItem item;

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

  Data() {
    successDrop = false;

    items = Constants.initializeList(items);
  }

flutter-devs

class Constants{

  static String SPLASH_SCREEN='SPLASH_SCREEN';
static String HOME_SCREEN='HOME_SCREEN';

 static List<CardItem> initializeList(List<CardItem> itemList){

     itemList = [
      CardItem(content: JAVA, cardColor: BROWN_COLOR),
      CardItem(content: PHP, cardColor: RED_COLOR),

flutter-devs

class CardItem {
  String content;
  Color cardColor;
  double margin;

  CardItem({this.content, this.cardColor, this.margin});
}

flutter-devs

const  String APP_BAR_TITLE = 'Drag & Drop Demo'; 
const String NO_ITEMS_LEFT = 'No Items Left';
const String JAVA = 'Java';
const String PHP = 'PHP';
const String KOTLIN = 'Kotlin';
const String FLUTTER = 'Flutter';
const String NODEJS = 'Nodejs';
const DROP_ITEMS_HERE = 'Drop Items Here';