https://github.com/flutter-studio/rebound

A Flutter library that models spring dynamics and adds real world physics to your app.
https://github.com/flutter-studio/rebound

animation flutter rebound spring

Last synced: about 22 hours ago
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A Flutter library that models spring dynamics and adds real world physics to your app.

• Host: GitHub
• URL: https://github.com/flutter-studio/rebound
• Owner: flutter-studio
• License: apache-2.0
• Created: 2019-12-05T02:08:08.000Z (about 5 years ago)
• Default Branch: master
• Last Pushed: 2019-12-06T10:05:40.000Z (about 5 years ago)
• Last Synced: 2023-08-20T22:04:26.955Z (over 1 year ago)
• Topics: animation, flutter, rebound, spring
• Language: Dart
• Homepage:
• Size: 266 KB
• Stars: 15
• Watchers: 1
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE

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README

        
English | [简体中文](./README_zh-CN.md)

# Flutter Rebound

[![pub package](https://img.shields.io/pub/v/flutter_rebound.svg)](https://pub.dartlang.org/packages/flutter_rebound)

A Flutter library that models spring dynamics and adds real world physics to your app. inspired by Facebook [Rebound](https://github.com/facebook/rebound)





  

  

## Usage

To use this plugin, add `flutter_rebound` as a [dependency in your pubspec.yaml file](https://flutter.io/platform-plugins/).


## Example

``` dart

// Import package

import 'package:flutter_rebound/flutter_rebound.dart';

import 'package:flutter/material.dart';

class MyHomePage extends StatefulWidget {

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

  final String title;

  @override

  _MyHomePageState createState() => _MyHomePageState();

}

class _MyHomePageState extends State with TickerProviderStateMixin {

  SpringSystem system;

  Spring spring;

  double _scale = 1;

  @override

  void initState() {

    super.initState();

    system = SpringSystem(vsync: this);

    spring = system.createSpring(40, 3);

    spring.addUpdateListener((spring) {

      double value = spring.currentValue;

      _scale = 1 - value * 0.5;

      setState(() {});

    });

    spring.endValue = 1;

  }

  @override

  void dispose() {

    system.dispose();

    super.dispose();

  }

  @override

  Widget build(BuildContext context) {

    return Scaffold(

      appBar: AppBar(

        title: Text(widget.title),

      ),

      body: Center(

        child: Transform.scale(

          scale: _scale,

          child: Container(

            width: 200,

            height: 200,

            color: Colors.red,

          ),

        ),

      ),

    );

  }

}

```