i41469.dart

i41469.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> with TickerProviderStateMixin {
  AnimationController animationController;
  Animation<double> animation;

  @override
  void initState() {
    super.initState();
    animationController = AnimationController(
        duration: new Duration(milliseconds: 250), vsync: this);

    animation = Tween<double>(begin: 15, end: 75).animate(animationController)
      ..addListener(() {
        setState(() {});
      });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: Stack(children: <Widget>[
      Positioned(
        bottom: 15,
        right: 15,
        child: Transform.scale(
          scale: animation.value - 1,
          child: FloatingActionButton(
            heroTag: null,
            shape: new RoundedRectangleBorder(
                borderRadius: new BorderRadius.circular(10.0)),
            elevation: 10.0,
            onPressed: () {
              animationController.forward();
            },
            child: Icon(Icons.add, color: Colors.white),
            backgroundColor: Colors.white,
          ),
        ),
      ),
    ]));
  }
}