roll_slot_machine 0.0.1

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  • Changelog
  • Example
  • Installing
  • 56

RollSlotMachine (under development) #

Detail usage will be added later but you can check the example project

Getting Started #

This project is a starting point for a Dart package, a library module containing code that can be shared easily across multiple Flutter or Dart projects.

For help getting started with Flutter, view our online documentation, which offers tutorials, samples, guidance on mobile development, and a full API reference.

[0.0.1] - 2020/05/31 #

  • initial release
  • RollSlotController created
  • RollSlot created


import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:roll_slot_machine/roll_slot_machine.dart';

void main() {

class MyApp extends StatelessWidget {
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        visualDensity: VisualDensity.adaptivePlatformDensity,
      home: MyHomePage(title: 'Flutter Demo Home Page'),

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

  final String title;

  _MyHomePageState createState() => _MyHomePageState();

class _MyHomePageState extends State<MyHomePage> {
  List<int> values = List.generate(100, (index) => index);

  var _rollSlotController = RollSlotController();

  void initState() {
    _rollSlotController.addListener(() {
      // trigger setState method to reload ui with new index
      // in our case the AppBar title will change
      setState(() {});

  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(_rollSlotController.currentIndex.toString()),
      body: Center(
        child: Column(
          children: <Widget>[
              child: Padding(
                padding: const EdgeInsets.all(8.0),
                child: RollSlot(
                    duration: Duration(milliseconds: 10000),
                    itemExtend: 300,
                    shuffleList: false,
                    rollSlotController: _rollSlotController,
                    children: values
                          (e) => BuildItem(
                            index: e,
      floatingActionButton: FloatingActionButton(
        onPressed: () => _rollSlotController.animateRandomly(),
        child: Icon(Icons.refresh),

class BuildItem extends StatelessWidget {
  const BuildItem({
    Key key,
  }) : super(key: key);

  final int index;

  Widget build(BuildContext context) {
    return Container(
      decoration: BoxDecoration(
        borderRadius: BorderRadius.circular(20),
      child: Text(
        style: TextStyle(
          color: Colors.white,
          fontSize: 36,

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  roll_slot_machine: ^0.0.1

2. Install it

You can install packages from the command line:

with Flutter:

$ flutter pub get

Alternatively, your editor might support flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:roll_slot_machine/roll_slot_machine.dart';
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Learn more about scoring.

We analyzed this package on Jul 9, 2020, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.8.4
  • pana: 0.13.14
  • Flutter: 1.17.5

Analysis suggestions

Package not compatible with SDK dart


  • roll_slot_machine that is a package requiring null.

Health suggestions

Format lib/roll_slot_machine.dart.

Run flutter format to format lib/roll_slot_machine.dart.

Maintenance suggestions

The package description is too short. (-20 points)

Add more detail to the description field of pubspec.yaml. Use 60 to 180 characters to describe the package, what it does, and its target use case.

Package is pre-v0.1 release. (-10 points)

While nothing is inherently wrong with versions of 0.0.*, it might mean that the author is still experimenting with the general direction of the API.


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.7.0 <3.0.0
flutter 0.0.0
Transitive dependencies
collection 1.14.12 1.14.13
meta 1.1.8 1.2.2
sky_engine 0.0.99
typed_data 1.1.6 1.2.0
vector_math 2.0.8 2.1.0-nullsafety
Dev dependencies