/* SmoothScroll for websites v1.2.1. Licensed under the terms of the MIT license. People involved: Balazs Galambosi (maintainer), Michael Herf (Pulse Algorithm), Edwin Ang (optimzation and added support) */ (function(){var defaultOptions={frameRate: 1500,animationTime: 1400,stepSize: 80,pulseAlgorithm: true,pulseScale: 8,pulseNormalize: 1,accelerationDelta: 20,accelerationMax: 1,keyboardSupport: true,arrowScroll: 50,touchpadSupport: true,fixedBackground: true, excluded: ""};var options = defaultOptions;var isExcluded=false;var isFrame=false;var direction={x:0,y:0};var initDone=false;var root=document.documentElement;var activeElement;var observer;var deltaBuffer=[120,120,120];var key={left:37,up:38,right:39,down:40,spacebar:32,pageup:33,pagedown:34,end:35,home:36};var options = defaultOptions;function initTest() {var disableKeyboard = false; if(disableKeyboard){removeEvent("keydown", keydown)}; if (options.keyboardSupport && !disableKeyboard){addEvent("keydown", keydown)};}function init(){if(!document.body)return;var e=document.body;var t=document.documentElement;var n=window.innerHeight;var r=e.scrollHeight;root=document.compatMode.indexOf("CSS")>=0?t:e;activeElement=e;initTest();initDone=true;if(top!=self){isFrame=true}else if(r>n&&(e.offsetHeight<=n||t.offsetHeight<=n)){var i=false;var s=function(){if(!i&&t.scrollHeight!=document.height){i=true;setTimeout(function(){t.style.height=document.height+"px";i=false},500)}};t.style.height="auto";setTimeout(s,10);if(root.offsetHeight<=n){var o=document.createElement("div");o.style.clear="both";e.appendChild(o)}}if(!options.fixedBackground&&!isExcluded){e.style.backgroundAttachment="scroll";t.style.backgroundAttachment="scroll"}}function scrollArray(e,t,n,r){r||(r=1e3);directionCheck(t,n);if(options.accelerationMax!=1){var i=+(new Date);var s=i-lastScroll;if(s<options.accelerationDelta){var o=(1+30/s)/2;if(o>1){o=Math.min(o,options.accelerationMax);t*=o;n*=o}}lastScroll=+(new Date)}que.push({x:t,y:n,lastX:t<0?.99:-.99,lastY:n<0?.99:-.99,start:+(new Date)});if(pending){return}var u=e===document.body;var a=function(i){var s=+(new Date);var o=0;var f=0;for(var l=0;l<que.length;l++){var c=que[l];var h=s-c.start;var p=h>=options.animationTime;var d=p?1:h/options.animationTime;if(options.pulseAlgorithm){d=pulse(d)}var v=c.x*d-c.lastX>>0;var m=c.y*d-c.lastY>>0;o+=v;f+=m;c.lastX+=v;c.lastY+=m;if(p){que.splice(l,1);l--}}if(u){window.scrollBy(o,f)}else{if(o)e.scrollLeft+=o;if(f)e.scrollTop+=f}if(!t&&!n){que=[]}if(que.length){requestFrame(a,e,r/options.frameRate+1)}else{pending=false}};requestFrame(a,e,0);pending=true}function wheel(e){if(!initDone){init()}var t=e.target;var n=overflowingAncestor(t);if(!n||e.defaultPrevented||isNodeName(activeElement,"embed")||isNodeName(t,"embed")&&/\.pdf/i.test(t.src)){return true}var r=e.wheelDeltaX||0;var i=e.wheelDeltaY||0;if(!r&&!i){i=e.wheelDelta||0}if(!options.touchpadSupport&&isTouchpad(i)){return true}if(Math.abs(r)>1.2){r*=options.stepSize/120}if(Math.abs(i)>1.2){i*=options.stepSize/120}scrollArray(n,-r,-i);e.preventDefault()}function keydown(e){var t=e.target;var n=e.ctrlKey||e.altKey||e.metaKey||e.shiftKey&&e.keyCode!==key.spacebar;if(/input|textarea|select|embed/i.test(t.nodeName)||t.isContentEditable||e.defaultPrevented||n){return true}if(isNodeName(t,"button")&&e.keyCode===key.spacebar){return true}var r,i=0,s=0;var o=overflowingAncestor(activeElement);var u=o.clientHeight;if(o==document.body){u=window.innerHeight}switch(e.keyCode){case key.up:s=-options.arrowScroll;break;case key.down:s=options.arrowScroll;break;case key.spacebar:r=e.shiftKey?1:-1;s=-r*u*.9;break;case key.pageup:s=-u*.9;break;case key.pagedown:s=u*.9;break;case key.home:s=-o.scrollTop;break;case key.end:var a=o.scrollHeight-o.scrollTop-u;s=a>0?a+10:0;break;case key.left:i=-options.arrowScroll;break;case key.right:i=options.arrowScroll;break;default:return true}scrollArray(o,i,s);e.preventDefault()}var que=[];var pending=false;var lastScroll=+(new Date);function mousedown(e){activeElement=e.target}function setCache(e,t){for(var n=e.length;n--;)cache[uniqueID(e[n])]=t;return t}function overflowingAncestor(e){var t=[];var n=root.scrollHeight;do{var r=cache[uniqueID(e)];if(r){return setCache(t,r)}t.push(e);if(n===e.scrollHeight){if(!isFrame||root.clientHeight+10<n){return setCache(t,document.body)}}else if(e.clientHeight+10<e.scrollHeight){overflow=getComputedStyle(e,"").getPropertyValue("overflow-y");if(overflow==="scroll"||overflow==="auto"){return setCache(t,e)}}}while(e=e.parentNode)}function addEvent(e,t,n){window.addEventListener(e,t,n||false)}function removeEvent(e,t,n){window.removeEventListener(e,t,n||false)}function isNodeName(e,t){return(e.nodeName||"").toLowerCase()===t.toLowerCase()}function directionCheck(e,t){e=e>0?1:-1;t=t>0?1:-1;if(direction.x!==e||direction.y!==t){direction.x=e;direction.y=t;que=[];lastScroll=0}}function isTouchpad(e){if(!e)return;e=Math.abs(e);deltaBuffer.push(e);deltaBuffer.shift();clearTimeout(deltaBufferTimer);var t=isDivisible(deltaBuffer[0],120)&&isDivisible(deltaBuffer[1],120)&&isDivisible(deltaBuffer[2],120);return!t}function isDivisible(e,t){return Math.floor(e/t)==e/t}function pulse_(e){var t,n,r;e=e*options.pulseScale;if(e<1){t=e-(1-Math.exp(-e))}else{n=Math.exp(-1);e-=1;r=1-Math.exp(-e);t=n+r*(1-n)}return t*options.pulseNormalize}var cache={};setInterval(function(){cache={}},10*1e3);var uniqueID=function(){var e=0;return function(t){return t.uniqueID||(t.uniqueID=e++)}}();var deltaBufferTimer;var requestFrame=function(){return window.requestAnimationFrame||window.webkitRequestAnimationFrame||function(e,t,n){window.setTimeout(e,n||1e3/60)}}();function pulse(e){if(e>=1)return 1;if(e<=0)return 0;if(options.pulseNormalize==1){options.pulseNormalize/=pulse_(1)}return pulse_(e)}var isSupportedBrowser=/chrome/i.test(window.navigator.userAgent)?true:/safari/i.test(window.navigator.userAgent);var wheelEvent=null;if("onwheel"in document.createElement("div"))wheelEvent="wheel";else if("onmousewheel"in document.createElement("div"))wheelEvent="mousewheel";if(wheelEvent&&isSupportedBrowser){addEvent(wheelEvent,wheel);addEvent("mousedown",mousedown);addEvent("load",init)}})();