带快速拨号功能的颤动浮动操作按钮

是否有任何现成的小部件或从哪里开始带有快速拨号操作的浮动操作按钮 https://material.io/guidelines/components/buttons-floating-action-button.html#buttons-floating-action-button-transitions in Flutter https://flutter.io.

这是如何实现的草图快速拨号 using FloatingActionButton.

import 'package:flutter/material.dart';
import 'dart:math' as math;

void main() {
  runApp(new MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      home: new MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  State createState() => new MyHomePageState();
}

class MyHomePageState extends State<MyHomePage> with TickerProviderStateMixin {
  AnimationController _controller;

  static const List<IconData> icons = const [ Icons.sms, Icons.mail, Icons.phone ];

  @override
  void initState() {
    _controller = new AnimationController(
      vsync: this,
      duration: const Duration(milliseconds: 500),
    );
  }

  Widget build(BuildContext context) {
    Color backgroundColor = Theme.of(context).cardColor;
    Color foregroundColor = Theme.of(context).accentColor;
    return new Scaffold(
      appBar: new AppBar(title: new Text('Speed Dial Example')),
      floatingActionButton: new Column(
        mainAxisSize: MainAxisSize.min,
        children: new List.generate(icons.length, (int index) {
          Widget child = new Container(
            height: 70.0,
            width: 56.0,
            alignment: FractionalOffset.topCenter,
            child: new ScaleTransition(
              scale: new CurvedAnimation(
                parent: _controller,
                curve: new Interval(
                  0.0,
                  1.0 - index / icons.length / 2.0,
                  curve: Curves.easeOut
                ),
              ),
              child: new FloatingActionButton(
                heroTag: null,
                backgroundColor: backgroundColor,
                mini: true,
                child: new Icon(icons[index], color: foregroundColor),
                onPressed: () {},
              ),
            ),
          );
          return child;
        }).toList()..add(
          new FloatingActionButton(
            heroTag: null,
            child: new AnimatedBuilder(
              animation: _controller,
              builder: (BuildContext context, Widget child) {
                return new Transform(
                  transform: new Matrix4.rotationZ(_controller.value * 0.5 * math.pi),
                  alignment: FractionalOffset.center,
                  child: new Icon(_controller.isDismissed ? Icons.share : Icons.close),
                );
              },
            ),
            onPressed: () {
              if (_controller.isDismissed) {
                _controller.forward();
              } else {
                _controller.reverse();
              }
            },
          ),
        ),
      ),
    );
  }
}