flutter-devs

const Color GRAY_COLOR = Colors.grey;
const Color BROWN_COLOR = Colors.brown;
const Color RED_COLOR = Colors.red;
const Color ORANGE_COLOR = Colors.orange;
const Color BLUE_COLOR = Colors.blue;
const Color GREEN_COLOR = Colors.green;
const Color WHITE_COLOR = Colors.white;

flutter-devs

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Drag and Drop Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(primarySwatch: Colors.green),
      routes: <String, WidgetBuilder>{

flutter-devs

DragTarget(
              builder: (context, List<String> candidateData, rejectedData) {
                return Center(
                  child: isSuccessful
                      ? Padding(
                          padding: EdgeInsets.only(top: 100.0),
                          child: Container(
                            color: Colors.yellow,
                            height: 200.0,
                            width: 200.0,

flutter-devs

Draggable(
              data: 'Flutter',
              child: FlutterLogo(
                size: 100.0,
              ),
              feedback: FlutterLogo(
                size: 100.0,
              ),
              childWhenDragging: Container(),
            )

flutter-devs

    AnimationController _animationController =
        AnimationController(vsync: this, duration: Duration(seconds: 1));

    Animation _animation =  Tween(begin: 0.0, end: -0.15).animate(
        CurvedAnimation(curve: Curves.ease, parent: _animationController));

flutter-devs

Animation transformAnimation = BorderRadiusTween(
      begin: BorderRadius.circular(125.0),
      end: BorderRadius.circular(0.0).animate(type_of_animation);
      
      
/////////////// OR ///////////////

Animation transformAnimation = Tween<BorderRadius>(
      begin: BorderRadius.circular(125.0),
      end: BorderRadius.circular(0.0).animate(type_of_animation);

flutter-devs

Animation _animation = Tween(begin: 0.0, end: 1.0).animate(type_of_animation);

flutter-devs

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

class _HomeScreenState extends State<HomeScreen>
    with SingleTickerProviderStateMixin {

  AnimationController _animationController;
  

flutter-devs

import 'dart:async';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/foundation.dart' show SynchronousFuture;

class AppLocalizations {

  AppLocalizations(this.locale);

  final Locale locale;

flutter-devs

static void setLocale(BuildContext context, Locale newLocale) async {
 _MyAppState state = context.ancestorStateOfType(TypeMatcher<_MyAppState>());
 state.setState(() {
   state.locale = newLocale;
 });
}