Monthly Downloads: 0
Programming language: JavaScript
License: GNU General Public License v3.0 or later
Tags: UI Animation     React     Tween     Animation     Transition     State     Mixin     Interactive     Interpolation    
Latest version: v0.1.5

react-tween-state alternatives and similar libraries

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React Tween State

The equivalent of React's this.setState, but for animated tweens: this.tweenState.

Live demo and source.


npm install react-tween-state


bower install react-tween-state


Example usage:

var tweenState = require('react-tween-state');
var React = require('react');

var App = React.createClass({
  mixins: [tweenState.Mixin],
  getInitialState: function() {
    return {left: 0};
  handleClick: function() {
    this.tweenState('left', {
      easing: tweenState.easingTypes.easeInOutQuad,
      duration: 500,
      endValue: this.state.left === 0 ? 400 : 0
  render: function() {
    var style = {
      position: 'absolute',
      width: 50,
      height: 50,
      backgroundColor: 'lightblue',
      left: this.getTweeningValue('left')
    return <div style={style} onClick={this.handleClick} />;

The library exports Mixin, easingTypes and stackBehavior.

this.tweenState(path: String | Array<String>, configuration: Object)

This first calls setState and puts your fields straight to their final value. Under the hood, it creates a layer that interpolates from the old value to the new. You can retrieve that tweening value using getTweeningValue below.

path is the name of the state field you want to tween. If it's deeply nested, e.g. to animate c in {a: {b: {c: 1}}}, provide the path as ['a', 'b', 'c']

configuration is of the following format:

  easing: easingFunction,
  duration: timeInMilliseconds,
  delay: timeInMilliseconds,
  beginValue: aNumber,
  endValue: aNumber,
  onEnd: endCallback,
  stackBehavior: behaviorOption
  • easing (default: easingTypes.easeInOutQuad): the interpolation function used. react-tween-state provides frequently used interpolation (exposed under easingTypes). To plug in your own, the function signature is: (currentTime: Number, beginValue: Number, endValue: Number, totalDuration: Number): Number.
  • duration (default: 300).
  • delay (default: 0). *
  • beginValue (default: the current value of the state field).
  • endValue.
  • onEnd: the callback to trigger when the animation's done. **
  • stackBehavior (default: stackBehavior.ADDITIVE). Subsequent tween to the same state value will be stacked (added together). This gives a smooth tween effect that is iOS 8's new default. This blog post describes it well. The other option is stackBehavior.DESTRUCTIVE, which replaces all current animations of that state value by this new one.

* For a destructive animation, starting the next one with a delay still immediately kills the previous tween. If that's not your intention, try setTimeout or additive animation. DESTRUCTIVE + duration 0 effectively cancels all in-flight animations, skipping the easing function.

** For an additive animation, since the tweens stack and never get destroyed, the end callback is effectively fired at the end of duration.

this.getTweeningValue(path: String | Array<String>)

Get the current tweening value of the state field. Typically used in render.



*Note that all licence references and agreements mentioned in the react-tween-state README section above are relevant to that project's source code only.