smoothscroll.js

(function() {var M={frameRate:150,animationTime:400,stepSize:120,pulseAlgorithm:true,pulseScale:4,pulseNormalize:1,accelerationDelta:20,accelerationMax:1,keyboardSupport:true,arrowScroll:50,touchpadSupport:true,fixedBackground:true,excluded:""};var y=M;var w=false;var t=false;var i={x:0,y:0};var b=false;var A=document.documentElement;var e;var E;var R=[];var N=/^Mac/.test(navigator.platform);var s={left:37,up:38,right:39,down:40,spacebar:32,pageup:33,pagedown:34,end:35,home:36};var y=M;function T() {if(y.keyboardSupport) {g("keydown",x)}}function P() {if(b||!document.body) {return}b=true;var aa=document.body;var Z=document.documentElement;var U=window.innerHeight;var ac=aa.scrollHeight;A=(document.compatMode.indexOf("CSS")>=0)?Z:aa;e=aa;T();if(top!=self) {t=true}else{if(ac>U&&(aa.offsetHeight<=U||Z.offsetHeight<=U)) {var Y=document.createElement("div");Y.style.cssText="position:absolute; z-index:-10000; top:0; left:0; right:0; height:"+A.scrollHeight+"px";document.body.appendChild(Y);var X;var ab=function() {if(X) {return}X=setTimeout(function() {if(w) {return}Y.style.height="0";Y.style.height=A.scrollHeight+"px";X=null},500)};setTimeout(ab,10);var W={attributes:true,childList:true,characterData:false};E=new B(ab);E.observe(aa,W);if(A.offsetHeight<=U) {var V=document.createElement("div");V.style.clear="both";aa.appendChild(V)}}}if(!y.fixedBackground&&!w) {aa.style.backgroundAttachment="scroll";Z.style.backgroundAttachment="scroll"}}function c() {E&&E.disconnect();a(F,n);a("mousedown",p);a("keydown",x)}var H=[];var h=false;var o=Date.now();function Q(Z,ab,aa) {C(ab,aa);if(y.accelerationMax!=1) {var W=Date.now();var V=W-o;if(V<y.accelerationDelta) {var X=(1+(50/V))/2;if(X>1) {X=Math.min(X,y.accelerationMax);ab*=X;aa*=X}}o=Date.now()}H.push({x:ab,y:aa,lastX:(ab<0)?0.99:-0.99,lastY:(aa<0)?0.99:-0.99,start:Date.now()});if(h) {return}var U=(Z===document.body);var Y=function(ad) {var ac=Date.now();var ak=0;var aj=0;for(var af=0;af<H.length;af++) {var am=H[af];var al=ac-am.start;var ae=(al>=y.animationTime);var ag=(ae)?1:al/y.animationTime;if(y.pulseAlgorithm) {ag=k(ag)}var ai=(am.x*ag-am.lastX)>>0;var ah=(am.y*ag-am.lastY)>>0;ak+=ai;aj+=ah;am.lastX+=ai;am.lastY+=ah;if(ae) {H.splice(af,1);af--}}if(U) {window.scrollBy(ak,aj)}else{if(ak) {Z.scrollLeft+=ak}if(aj) {Z.scrollTop+=aj}}if(!ab&&!aa) {H=[]}if(H.length) {G(Y,Z,(1000/y.frameRate+1))}else{h=false}};G(Y,Z,0);h=true}function n(X) {if(!b) {P()}var Y=X.target;var W=J(Y);if(!W||X.defaultPrevented||X.ctrlKey) {return true}if(m(e,"embed")||(m(Y,"embed")&&/\.pdf/i.test(Y.src))||m(e,"object")) {return true}var V=-X.wheelDeltaX||X.deltaX||0;var U=-X.wheelDeltaY||X.deltaY||0;if(N) {if(X.wheelDeltaX&&r(X.wheelDeltaX,120)) {V=-120*(X.wheelDeltaX/Math.abs(X.wheelDeltaX))}if(X.wheelDeltaY&&r(X.wheelDeltaY,120)) {U=-120*(X.wheelDeltaY/Math.abs(X.wheelDeltaY))}}if(!V&&!U) {U=-X.wheelDelta||0}if(X.deltaMode===1) {V*=40;U*=40}if(!y.touchpadSupport&&S(U)) {return true}if(Math.abs(V)>1.2) {V*=y.stepSize/120}if(Math.abs(U)>1.2) {U*=y.stepSize/120}Q(W,V,U);X.preventDefault();l()}function x(V) {var ac=V.target;var aa=V.ctrlKey||V.altKey||V.metaKey||(V.shiftKey&&V.keyCode!==s.spacebar);if(!document.contains(e)) {e=document.activeElement}var W=/^(textarea|select|embed|object)$/i;var X=/^(button|submit|radio|checkbox|file|color|image)$/i;if(W.test(ac.nodeName)||m(ac,"input")&&!X.test(ac.type)||m(e,"video")||q(V)||ac.isContentEditable||V.defaultPrevented||aa) {return true}if((m(ac,"button")||m(ac,"input")&&X.test(ac.type))&&V.keyCode===s.spacebar) {return true}var Y,ae=0,ad=0;var Z=J(e);var ab=Z.clientHeight;if(Z==document.body) {ab=window.innerHeight}switch(V.keyCode) {case s.up:ad=-y.arrowScroll;break;case s.down:ad=y.arrowScroll;break;case s.spacebar:Y=V.shiftKey?1:-1;ad=-Y*ab*0.9;break;case s.pageup:ad=-ab*0.9;break;case s.pagedown:ad=ab*0.9;break;case s.home:ad=-Z.scrollTop;break;case s.end:var U=Z.scrollHeight-Z.scrollTop-ab;ad=(U>0)?U+10:0;break;case s.left:ae=-y.arrowScroll;break;case s.right:ae=y.arrowScroll;break;default:return true}Q(Z,ae,ad);V.preventDefault();l()}function p(U) {e=U.target}var z=(function() {var U=0;return function(V) {return V.uniqueID||(V.uniqueID=U++)}})();var j={};var O;function l() {clearTimeout(O);O=setInterval(function() {j={}},1*1000)}function d(V,U) {for(var W=V.length;W--;) {j[z(V[W])]=U}return U}function J(Z) {var W=[];var U=document.body;var V=A.scrollHeight;do{var Y=j[z(Z)];if(Y) {return d(W,Y)}W.push(Z);if(V===Z.scrollHeight) {var aa=I(A)&&I(U);var X=aa||D(A);if(t&&K(A)||!t&&X) {return d(W,u())}}else{if(K(Z)&&D(Z)) {return d(W,Z)}}}while(Z=Z.parentElement)}function K(U) {return(U.clientHeight+10<U.scrollHeight)}function I(U) {var V=getComputedStyle(U,"").getPropertyValue("overflow-y");return(V!=="hidden")}function D(U) {var V=getComputedStyle(U,"").getPropertyValue("overflow-y");return(V==="scroll"||V==="auto")}function g(V,U) {window.addEventListener(V,U,false)}function a(V,U) {window.removeEventListener(V,U,false)}function m(V,U) {return(V.nodeName||"").toLowerCase()===U.toLowerCase()}function C(U,V) {U=(U>0)?1:-1;V=(V>0)?1:-1;if(i.x!==U||i.y!==V) {i.x=U;i.y=V;H=[];o=0}}var f;if(window.localStorage&&localStorage.SS_deltaBuffer) {R=localStorage.SS_deltaBuffer.split(",")}function S(U) {if(!U) {return}if(!R.length) {R=[U,U,U]}U=Math.abs(U);R.push(U);R.shift();clearTimeout(f);f=setTimeout(function() {if(window.localStorage) {localStorage.SS_deltaBuffer=R.join(",")}},1000);return !v(120)&&!v(100)}function r(V,U) {return(Math.floor(V/U)==V/U)}function v(U) {return(r(R[0],U)&&r(R[1],U)&&r(R[2],U))}function q(W) {var V=W.target;var U=false;if(document.URL.indexOf("www.youtube.com/watch")!=-1) {do{U=(V.classList&&V.classList.contains("html5-video-controls"));if(U) {break}}while(V=V.parentNode)}return U}var G=(function() {return(window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||function(W,V,U) {window.setTimeout(W,U||(1000/60))})})();var B=(window.MutationObserver||window.WebKitMutationObserver||window.MozMutationObserver);var u=(function() {var U;return function() {if(!U) {var X=document.createElement("div");X.style.cssText="height:10000px;width:1px;";document.body.appendChild(X);var W=document.body.scrollTop;var V=document.documentElement.scrollTop;window.scrollBy(0,1);if(document.body.scrollTop!=W) {(U=document.body)}else{(U=document.documentElement)}window.scrollBy(0,-1);document.body.removeChild(X)}return U}})();function L(U) {var W,X,V;U=U*y.pulseScale;if(U<1) {W=U-(1-Math.exp(-U))}else{X=Math.exp(-1);U-=1;V=1-Math.exp(-U);W=X+(V*(1-X))}return W*y.pulseNormalize}function k(U) {if(U>=1) {return 1}if(U<=0) {return 0}if(y.pulseNormalize==1) {y.pulseNormalize/=L(1)}return L(U)}var F;if("onwheel" in document.createElement("div")) {F="wheel"}else{if("onmousewheel" in document.createElement("div")) {F="mousewheel"}}if(F) {g(F,n);g("mousedown",p);g("load",P)}})();