lenis-wrapper.js

(function(root, factory) {
  if (typeof define === 'function' && define.amd) {
    define([], factory);
  } else if (typeof module === 'object' && module.exports) {
    module.exports = factory();
  } else {
    root.Lenis = factory();
  }
}(typeof self !== 'undefined' ? self : this, function() {
  function clamp(t,i,e){return Math.max(t,Math.min(i,e))}class Animate{constructor(){this.isRunning=!1,this.value=0,this.from=0,this.to=0,this.currentTime=0}advance(t){var i;if(!this.isRunning)return;let e=!1;if(this.duration&&this.easing){this.currentTime+=t;const i=clamp(0,this.currentTime/this.duration,1);e=i>=1;const s=e?1:this.easing(i);this.value=this.from+(this.to-this.from)*s}else this.lerp?(this.value=function damp(t,i,e,s){return function lerp(t,i,e){return(1-e)*t+e*i}(t,i,1-Math.exp(-e*s))}(this.value,this.to,60*this.lerp,t),Math.round(this.value)===this.to&&(this.value=this.to,e=!0)):(this.value=this.to,e=!0);e&&this.stop(),null===(i=this.onUpdate)||void 0===i||i.call(this,this.value,e)}stop(){this.isRunning=!1}fromTo(t,i,{lerp:e,duration:s,easing:o,onStart:n,onUpdate:l}){this.from=this.value=t,this.to=i,this.lerp=e,this.duration=s,this.easing=o,this.currentTime=0,this.isRunning=!0,null==n||n(),this.onUpdate=l}}class Dimensions{constructor(t,i,{autoResize:e=!0,debounce:s=250}={}){this.wrapper=t,this.content=i,this.width=0,this.height=0,this.scrollHeight=0,this.scrollWidth=0,this.resize=()=>{this.onWrapperResize(),this.onContentResize()},this.onWrapperResize=()=>{this.wrapper instanceof Window?(this.width=window.innerWidth,this.height=window.innerHeight):(this.width=this.wrapper.clientWidth,this.height=this.wrapper.clientHeight)},this.onContentResize=()=>{this.wrapper instanceof Window?(this.scrollHeight=this.content.scrollHeight,this.scrollWidth=this.content.scrollWidth):(this.scrollHeight=this.wrapper.scrollHeight,this.scrollWidth=this.wrapper.scrollWidth)},e&&(this.debouncedResize=function debounce(t,i){let e;return function(...s){let o=this;clearTimeout(e),e=setTimeout((()=>{e=void 0,t.apply(o,s)}),i)}}(this.resize,s),this.wrapper instanceof Window?window.addEventListener("resize",this.debouncedResize,!1):(this.wrapperResizeObserver=new ResizeObserver(this.debouncedResize),this.wrapperResizeObserver.observe(this.wrapper)),this.contentResizeObserver=new ResizeObserver(this.debouncedResize),this.contentResizeObserver.observe(this.content)),this.resize()}destroy(){var t,i;null===(t=this.wrapperResizeObserver)||void 0===t||t.disconnect(),null===(i=this.contentResizeObserver)||void 0===i||i.disconnect(),this.wrapper===window&&this.debouncedResize&&window.removeEventListener("resize",this.debouncedResize,!1)}get limit(){return{x:this.scrollWidth-this.width,y:this.scrollHeight-this.height}}}class Emitter{constructor(){this.events={}}emit(t,...i){var e;let s=this.events[t]||[];for(let t=0,o=s.length;t<o;t++)null===(e=s[t])||void 0===e||e.call(s,...i)}on(t,i){var e;return(null===(e=this.events[t])||void 0===e?void 0:e.push(i))||(this.events[t]=[i]),()=>{var e;this.events[t]=null===(e=this.events[t])||void 0===e?void 0:e.filter((t=>i!==t))}}off(t,i){var e;this.events[t]=null===(e=this.events[t])||void 0===e?void 0:e.filter((t=>i!==t))}destroy(){this.events={}}}const t=100/6,i={passive:!1};class VirtualScroll{constructor(e,s={wheelMultiplier:1,touchMultiplier:1}){this.element=e,this.options=s,this.touchStart={x:0,y:0},this.lastDelta={x:0,y:0},this.window={width:0,height:0},this.emitter=new Emitter,this.onTouchStart=t=>{const{clientX:i,clientY:e}=t.targetTouches?t.targetTouches[0]:t;this.touchStart.x=i,this.touchStart.y=e,this.lastDelta={x:0,y:0},this.emitter.emit("scroll",{deltaX:0,deltaY:0,event:t})},this.onTouchMove=t=>{const{clientX:i,clientY:e}=t.targetTouches?t.targetTouches[0]:t,s=-(i-this.touchStart.x)*this.options.touchMultiplier,o=-(e-this.touchStart.y)*this.options.touchMultiplier;this.touchStart.x=i,this.touchStart.y=e,this.lastDelta={x:s,y:o},this.emitter.emit("scroll",{deltaX:s,deltaY:o,event:t})},this.onTouchEnd=t=>{this.emitter.emit("scroll",{deltaX:this.lastDelta.x,deltaY:this.lastDelta.y,event:t})},this.onWheel=i=>{let{deltaX:e,deltaY:s,deltaMode:o}=i;e*=1===o?t:2===o?this.window.width:1,s*=1===o?t:2===o?this.window.height:1,e*=this.options.wheelMultiplier,s*=this.options.wheelMultiplier,this.emitter.emit("scroll",{deltaX:e,deltaY:s,event:i})},this.onWindowResize=()=>{this.window={width:window.innerWidth,height:window.innerHeight}},window.addEventListener("resize",this.onWindowResize,!1),this.onWindowResize(),this.element.addEventListener("wheel",this.onWheel,i),this.element.addEventListener("touchstart",this.onTouchStart,i),this.element.addEventListener("touchmove",this.onTouchMove,i),this.element.addEventListener("touchend",this.onTouchEnd,i)}on(t,i){return this.emitter.on(t,i)}destroy(){this.emitter.destroy(),window.removeEventListener("resize",this.onWindowResize,!1),this.element.removeEventListener("wheel",this.onWheel,i),this.element.removeEventListener("touchstart",this.onTouchStart,i),this.element.removeEventListener("touchmove",this.onTouchMove,i),this.element.removeEventListener("touchend",this.onTouchEnd,i)}}class Lenis{constructor({wrapper:t=window,content:i=document.documentElement,eventsTarget:e=t,smoothWheel:s=!0,syncTouch:o=!1,syncTouchLerp:n=.075,touchInertiaMultiplier:l=35,duration:r,easing:h=(t=>Math.min(1,1.001-Math.pow(2,-10*t))),lerp:a=.1,infinite:c=!1,orientation:u="vertical",gestureOrientation:d="vertical",touchMultiplier:p=1,wheelMultiplier:m=1,autoResize:v=!0,prevent:g,virtualScroll:S,__experimental__naiveDimensions:w=!1}={}){this._isScrolling=!1,this._isStopped=!1,this._isLocked=!1,this._preventNextNativeScrollEvent=!1,this._resetVelocityTimeout=null,this.time=0,this.userData={},this.lastVelocity=0,this.velocity=0,this.direction=0,this.animate=new Animate,this.emitter=new Emitter,this.onPointerDown=t=>{1===t.button&&this.reset()},this.onVirtualScroll=t=>{if("function"==typeof this.options.virtualScroll&&!1===this.options.virtualScroll(t))return;const{deltaX:i,deltaY:e,event:s}=t;if(this.emitter.emit("virtual-scroll",{deltaX:i,deltaY:e,event:s}),s.ctrlKey)return;const o=s.type.includes("touch"),n=s.type.includes("wheel");this.isTouching="touchstart"===s.type||"touchmove"===s.type;if(this.options.syncTouch&&o&&"touchstart"===s.type&&!this.isStopped&&!this.isLocked)return void this.reset();const l=0===i&&0===e,r="vertical"===this.options.gestureOrientation&&0===e||"horizontal"===this.options.gestureOrientation&&0===i;if(l||r)return;let h=s.composedPath();h=h.slice(0,h.indexOf(this.rootElement));const a=this.options.prevent;if(h.find((t=>{var i,e,s,l,r;return t instanceof HTMLElement&&("function"==typeof a&&(null==a?void 0:a(t))||(null===(i=t.hasAttribute)||void 0===i?void 0:i.call(t,"data-lenis-prevent"))||o&&(null===(e=t.hasAttribute)||void 0===e?void 0:e.call(t,"data-lenis-prevent-touch"))||n&&(null===(s=t.hasAttribute)||void 0===s?void 0:s.call(t,"data-lenis-prevent-wheel"))||(null===(l=t.classList)||void 0===l?void 0:l.contains("lenis"))&&!(null===(r=t.classList)||void 0===r?void 0:r.contains("lenis-stopped")))})))return;if(this.isStopped||this.isLocked)return void s.preventDefault();if(!(this.options.syncTouch&&o||this.options.smoothWheel&&n))return this.isScrolling="native",void this.animate.stop();s.preventDefault();let c=e;"both"===this.options.gestureOrientation?c=Math.abs(e)>Math.abs(i)?e:i:"horizontal"===this.options.gestureOrientation&&(c=i);const u=o&&this.options.syncTouch,d=o&&"touchend"===s.type&&Math.abs(c)>5;d&&(c=this.velocity*this.options.touchInertiaMultiplier),this.scrollTo(this.targetScroll+c,Object.assign({programmatic:!1},u?{lerp:d?this.options.syncTouchLerp:1}:{lerp:this.options.lerp,duration:this.options.duration,easing:this.options.easing}))},this.onNativeScroll=()=>{if(null!==this._resetVelocityTimeout&&(clearTimeout(this._resetVelocityTimeout),this._resetVelocityTimeout=null),this._preventNextNativeScrollEvent)this._preventNextNativeScrollEvent=!1;else if(!1===this.isScrolling||"native"===this.isScrolling){const t=this.animatedScroll;this.animatedScroll=this.targetScroll=this.actualScroll,this.lastVelocity=this.velocity,this.velocity=this.animatedScroll-t,this.direction=Math.sign(this.animatedScroll-t),this.isScrolling="native",this.emit(),0!==this.velocity&&(this._resetVelocityTimeout=setTimeout((()=>{this.lastVelocity=this.velocity,this.velocity=0,this.isScrolling=!1,this.emit()}),400))}},window.lenisVersion="1.1.13",t&&t!==document.documentElement&&t!==document.body||(t=window),this.options={wrapper:t,content:i,eventsTarget:e,smoothWheel:s,syncTouch:o,syncTouchLerp:n,touchInertiaMultiplier:l,duration:r,easing:h,lerp:a,infinite:c,gestureOrientation:d,orientation:u,touchMultiplier:p,wheelMultiplier:m,autoResize:v,prevent:g,virtualScroll:S,__experimental__naiveDimensions:w},this.dimensions=new Dimensions(t,i,{autoResize:v}),this.updateClassName(),this.targetScroll=this.animatedScroll=this.actualScroll,this.options.wrapper.addEventListener("scroll",this.onNativeScroll,!1),this.options.wrapper.addEventListener("pointerdown",this.onPointerDown,!1),this.virtualScroll=new VirtualScroll(e,{touchMultiplier:p,wheelMultiplier:m}),this.virtualScroll.on("scroll",this.onVirtualScroll)}destroy(){this.emitter.destroy(),this.options.wrapper.removeEventListener("scroll",this.onNativeScroll,!1),this.options.wrapper.removeEventListener("pointerdown",this.onPointerDown,!1),this.virtualScroll.destroy(),this.dimensions.destroy(),this.cleanUpClassName()}on(t,i){return this.emitter.on(t,i)}off(t,i){return this.emitter.off(t,i)}setScroll(t){this.isHorizontal?this.rootElement.scrollLeft=t:this.rootElement.scrollTop=t}resize(){this.dimensions.resize(),this.animatedScroll=this.targetScroll=this.actualScroll,this.emit()}emit(){this.emitter.emit("scroll",this)}reset(){this.isLocked=!1,this.isScrolling=!1,this.animatedScroll=this.targetScroll=this.actualScroll,this.lastVelocity=this.velocity=0,this.animate.stop()}start(){this.isStopped&&(this.isStopped=!1,this.reset())}stop(){this.isStopped||(this.isStopped=!0,this.animate.stop(),this.reset())}raf(t){const i=t-(this.time||t);this.time=t,this.animate.advance(.001*i)}scrollTo(t,{offset:i=0,immediate:e=!1,lock:s=!1,duration:o=this.options.duration,easing:n=this.options.easing,lerp:l=this.options.lerp,onStart:r,onComplete:h,force:a=!1,programmatic:c=!0,userData:u}={}){if(!this.isStopped&&!this.isLocked||a){if("string"==typeof t&&["top","left","start"].includes(t))t=0;else if("string"==typeof t&&["bottom","right","end"].includes(t))t=this.limit;else{let e;if("string"==typeof t?e=document.querySelector(t):t instanceof HTMLElement&&(null==t?void 0:t.nodeType)&&(e=t),e){if(this.options.wrapper!==window){const t=this.rootElement.getBoundingClientRect();i-=this.isHorizontal?t.left:t.top}const s=e.getBoundingClientRect();t=(this.isHorizontal?s.left:s.top)+this.animatedScroll}}if("number"==typeof t){if(t+=i,t=Math.round(t),this.options.infinite?c&&(this.targetScroll=this.animatedScroll=this.scroll):t=clamp(0,t,this.limit),t===this.targetScroll)return null==r||r(this),void(null==h||h(this));if(this.userData=null!=u?u:{},e)return this.animatedScroll=this.targetScroll=t,this.setScroll(this.scroll),this.reset(),this.preventNextNativeScrollEvent(),this.emit(),null==h||h(this),void(this.userData={});c||(this.targetScroll=t),this.animate.fromTo(this.animatedScroll,t,{duration:o,easing:n,lerp:l,onStart:()=>{s&&(this.isLocked=!0),this.isScrolling="smooth",null==r||r(this)},onUpdate:(t,i)=>{this.isScrolling="smooth",this.lastVelocity=this.velocity,this.velocity=t-this.animatedScroll,this.direction=Math.sign(this.velocity),this.animatedScroll=t,this.setScroll(this.scroll),c&&(this.targetScroll=t),i||this.emit(),i&&(this.reset(),this.emit(),null==h||h(this),this.userData={},this.preventNextNativeScrollEvent())}})}}}preventNextNativeScrollEvent(){this._preventNextNativeScrollEvent=!0,requestAnimationFrame((()=>{this._preventNextNativeScrollEvent=!1}))}get rootElement(){return this.options.wrapper===window?document.documentElement:this.options.wrapper}get limit(){return this.options.__experimental__naiveDimensions?this.isHorizontal?this.rootElement.scrollWidth-this.rootElement.clientWidth:this.rootElement.scrollHeight-this.rootElement.clientHeight:this.dimensions.limit[this.isHorizontal?"x":"y"]}get isHorizontal(){return"horizontal"===this.options.orientation}get actualScroll(){return this.isHorizontal?this.rootElement.scrollLeft:this.rootElement.scrollTop}get scroll(){return this.options.infinite?function modulo(t,i){return(t%i+i)%i}(this.animatedScroll,this.limit):this.animatedScroll}get progress(){return 0===this.limit?1:this.scroll/this.limit}get isScrolling(){return this._isScrolling}set isScrolling(t){this._isScrolling!==t&&(this._isScrolling=t,this.updateClassName())}get isStopped(){return this._isStopped}set isStopped(t){this._isStopped!==t&&(this._isStopped=t,this.updateClassName())}get isLocked(){return this._isLocked}set isLocked(t){this._isLocked!==t&&(this._isLocked=t,this.updateClassName())}get isSmooth(){return"smooth"===this.isScrolling}get className(){let t="lenis";return this.isStopped&&(t+=" lenis-stopped"),this.isLocked&&(t+=" lenis-locked"),this.isScrolling&&(t+=" lenis-scrolling"),"smooth"===this.isScrolling&&(t+=" lenis-smooth"),t}updateClassName(){this.cleanUpClassName(),this.rootElement.className=`${this.rootElement.className} ${this.className}`.trim()}cleanUpClassName(){this.rootElement.className=this.rootElement.className.replace(/lenis(-\w+)?/g,"").trim()}}

  // Return the Lenis constructor
  return Lenis;
}));