tweener 1.1.2

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  • Changelog
  • Example
  • Installing
  • 76

Tweener #

Tweener is a simple and lightweight flutter animation tool. Anyone can easily learn to use it.

Features #

  • Does one thing and one thing only: tween properties
  • Very simple to use, but it can achieve a lot of effects
  • Easing functions are reusable outside of Tween

Installation #

Install the Tweener

You should ensure that you add the following dependency in your Flutter project. #

  tweener: ^1.1.0

install packages from the command line: #

flutter packages get

Useage #

import class #

import 'package:tweener/tweener.dart';

use Tweener #

Tweener({"x": 0, "y": 0, "alpha": 0, "custom_prop_abc": 123})
    .to({"x": 100, "y": 500, "alpha": 1, "custom_prop_abc": 321}, 2000)
    .onUpdate((obj) {
        setState(() {
            _x = obj["x"];
            _y = obj["y"];
            _alpha = obj["alpha"];
            _abc = obj["custom_prop_abc"];
var tween1 = new Tweener(sprite)
	.to({x: 700, y: 200, rotation: 359}, 2000)

var tween2 = new Tweener(sprite)
	.to({x: 10, y: 20, rotation: 30}, 2000)


Thanks #

Tweener refers to the implementation code of tween.js. They are really great. I want to pay tribute to the original author!

1.1.2 #

  • Add file

1.1.1 #

  • Modify some method names
  • Add more easing functions

1.1.0 #

  • Modify the micketer structure


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

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  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 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.
      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;

  _MyHomePageState createState() => _MyHomePageState();

class _MyHomePageState extends State<MyHomePage> {
  double _counter = 0;

  void _incrementCounter() {
    Tweener({"x": 0, "y": 0, "alpha": 0, "custom_prop_abc": 123})
        .to({"x": 100, "y": 500, "alpha": 1, "custom_prop_abc": 321}, 2000)
        .onUpdate((obj) {
          setState(() {
            _counter = (obj["x"] * 100).round()*1.0;
        .onComplete((obj) {

  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 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: Column(
          // Column is also layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in Android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          children: <Widget>[
              'You have pushed the button this many times:',
              style: Theme.of(context).textTheme.display1,
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.

Use this package as a library

1. Depend on it

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

  tweener: ^1.1.2

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:tweener/tweener.dart';
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Learn more about scoring.

We analyzed this package on Jan 21, 2020, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.7.0
  • pana: 0.13.4
  • Flutter: 1.12.13+hotfix.5

Health issues and suggestions

Document public APIs. (-0.71 points)

102 out of 103 API elements have no dartdoc comment.Providing good documentation for libraries, classes, functions, and other API elements improves code readability and helps developers find and use your API.

Format lib/src/miticker.dart.

Run flutter format to format lib/src/miticker.dart.

Format lib/tweener.dart.

Run flutter format to format lib/tweener.dart.


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.1.0 <3.0.0
cupertino_icons ^0.1.2 0.1.3
flutter 0.0.0
Transitive dependencies
collection 1.14.11 1.14.12
meta 1.1.8
sky_engine 0.0.99
typed_data 1.1.6
vector_math 2.0.8
Dev dependencies