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Programming language: JavaScript
License: MIT License
Tags: Performance     UI     React     Reactjs     Animation     Interpolation     Additive Animation    

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README

react-voodoo Fast, SSR compatible, additive & swipeable, tween composition engine for React


Why another animation engine ?

To have some advanced functionalities :

  • Additive tween ( simultaneous tween on same properties like web animation APIs )
  • Swipeable animations ( like Android & iOS )
  • Fast & direct DOM updates ( not bound to the React rendering loop )
  • Server Side Rendering of any scroll / swipe position
  • Hot switching scrollable anims ( responsive )
  • Predictive inertia ( knowing where inertia will stop while animating )
  • Multitouch dragging ( drag multiple things at once )
  • Intuitive & flexible animation system
  • Cool ( & performant ) React integration
  • Automatically deal with multiple units using css "calc( ... )"
  • etc...

Some live demo & codesandbox here

Draft & minimalist samples here

Draft & minimalist doc [here](doc/readme.md)

Note

react-voodoo still miss some interpolator ( like background or borders ).

How can i help ?

[contributions welcome](#) [collaborators welcome](#) [*](#)

Basics

"all in one" example :

```jsx harmony

import React from "react"; import Voodoo from "react-voodoo"; import {itemTweenAxis, tweenArrayWithTargets} from "./somewhere";

const styleSample = { height : "50%",

    // the tweener deal with multiple units 
    // it will use css calc fn if there's more than 1 unit used 
    width : ["50%", "10vw", "-50px", ".2box"],

    // transform can use multiple "layers"
    transform: [
        {
            // use rotate(X|Y|Z) & translate(X|Y|Z)
            rotateX:"25deg"
        }, 
        {
            translateZ: "-.2box"
        }
    ],

    filter: 
        {
            blur:"5px"
        }

}; const axisSample = [ { target: "someTweenRefId", // target tween ref id ( optional if used as tweenAxis on a TweenRef ) from : 0, // tween start position duration: 100, // tween duration easeFn : "easeCircleIn", // function or easing fn id from d3-ease

    apply   : {// relative css values to be applied  
        // Same syntax as the styles
        transform: [{}, {
            translateZ: "-.2box"
        }]
    }
},
{
    from     : 40,
    duration : 20,

    // triggered when axis has scrolled in the Event period 
    // delta : [-1,1] is the update inside the Event period
    entering:(delta)=>false,

    // triggered when axis has scrolled in the Event period
    // newPos, precPos : [0,1] position inside the Event period
    // delta : [-1,1] is the update inside the Event period
    moving:(newPos, precPos, delta)=>false,

    // triggered when axis has scrolled out the Event period
    // delta : [-1,1] is the update inside the Event period
    leaving:(delta)=>false
}

];

const Sample = ( {} ) => { const //[parentTweener] = Voodoo.hook(true), [tweener, ViewBox] = Voodoo.hook();

// Voodoo.hook({name:"root"}) // tweener instance can be nammed like this
// Voodoo.hook("root")        // we can then get theirs ref like this 

React.useEffect(
    e => tweener?.watchAxis("scrollY", (pos)=>doSomething()),
    [tweener]
)

// once drawn :
// tweener.axes.(axisId).scrollPos
// tweener.axes.(axisId).scrollTo(targetPos, duration, easeFn)
// tweener.scrollTo(targetPos, duration, axisId, easeFn)

return <ViewBox className={ "container" }>
    <Voodoo.Axis

        id={"scrollY"}          // Tween axis Id
        defaultPosition={100}   // default start position

        // Global scrollable tween with theirs TweenRef target ids
        items={tweenArrayWithTargets}

        // size of the scrollable window for drag synchronisation
        scrollableWindow={ 200 }

        // default length of this scrollable axis
        size={ 1000 }

        // optional bounds ( inertia will target them if target pos is out )
        bounds={ { min : 100, max : 900 } }

        // inertia cfg ( false to disable it )
        inertia={
                {
                    // called when inertia is updated
                    // should return instantaneous move to do if wanted
                    shouldLoop: ( currentPos ) => ( currentPos > 500 ? -500 : null ),

                    // called when inertia know where it will end ( when the user stop dragging )
                    willEnd  : ( targetPos, targetDelta, duration ) => {},

                    // called when inertia know where it will snap ( when the user stop dragging )
                    willSnap  : ( currentSnapIndex, targetWayPointObj ) => {},

                    // list of waypoints object ( only support auto snap 50/50 for now )
                    wayPoints : [{ at: 100 }, { at: 200 }]
                }
            }
    />

    <Voodoo.Node
        id={"testItem"} // optional id

        style={styleSample}// initial styles : css syntax + voodoo tweener units & transform management

        // Scrollable tween with no target node id required ( it will be ignored )
        axes={{ scrollY : sampleAxis }}

        onClick={// all unknow props are passed to the child node
            (e)=>{
                // start playing an anim
                tweener.pushAnim(
                        // make all tween target "testItem"
                        Voodoo.tools.target(pushIn, "testItem")
                    ).then(
                        (tweenAxis) => {
                           // doSomething next
                        }
                );
            }
        }
    >
        <Voodoo.Draggable
            // make drag y move the scrollAnAxis axis
            // xAxis={ "scrollAnAxis" }

            // scale / inverse dispatched delta
            // xHook={(delta)=>modify(delta)} 

            // React ref to the box, default to the parent ViewBox 
            // scale is as follow : (delta / ((xBoxRef||ViewBox).offsetWidth)) * ( axis.scrollableWindow || axis.duration )  
            // xBoxRef={ref} 

            yAxis={ "scrollY" }// make drag y move the scrollY axis
            // yHook={(delta)=>modify(delta)}
            // yBoxRef={ref} 

            // mouseDrag={true} // listen for mouse drag ( default to false )
            // touchDrag={false} // listen for touch drag ( default to true )

            // button={1-3} // limit mouse drag to the specified event.button === ( default to 1; the left btn )

            // * actually Draggable create it's own div node
            >
                <div>
                    Some content to tween
                </div>
        </Voodoo.Draggable>
    </Voodoo.Node>
</ViewBox>;

}


## todo  ?

- add missing interpolator / strategy ( background, borders, ... )
- Doc, tests & code cleaning
- lot of various simple and/or smart optims / recycling
- SVG support

[![contributions welcome](https://img.shields.io/badge/contributions-welcome-brightgreen.svg?style=flat)](#)
[![*](https://www.google-analytics.com/collect?v=1&tid=UA-82058889-1&cid=555&t=event&ec=project&ea=view&dp=%2Fproject%2Freact-voodoo&dt=readme)](#)