FlipPanelBug

main.dart

import 'package:flip_panel/flip_panel.dart';
import 'package:flutter/material.dart';
import 'dart:async';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}
class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.
  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".
  final String title;
  @override
  _MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> with SingleTickerProviderStateMixin {
  AnimationController _controller;
  int _counter = 0;
  StreamController _streamController = StreamController<int>();

  @override
  void initState() {
    _controller = AnimationController(vsync: this, duration: Duration(seconds: 2))..addStatusListener((status) {
      if (status == AnimationStatus.completed) {
        _controller.reset();
        _controller.forward();
        setState(() {
          _counter++;
          print(_counter);
          _streamController.add(_counter);
        });
      }
    });

    _controller.forward();
    super.initState();
  }

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
      _streamController.add(_counter);
    });
  }
  @override
  void dispose() {
    _streamController.close();
    super.dispose();
  }
  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.

    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
          child: Row(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              FlipPanel<int>.stream(
                itemStream: _streamController.stream,
                itemBuilder: (context, value) => Container(
                  color: Colors.black,
                  padding: const EdgeInsets.symmetric(horizontal: 6.0),
                  child: Text(
                    '$value',
                    style: TextStyle(
                        fontWeight: FontWeight.bold,
                        fontSize: 50.0,
                        color: Colors.white
                    ),
                  ),
                ),
                initValue: 0,
              ),
            ],
          )),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}