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// SmoothScroll v0.9.9

// Licensed under the terms of the MIT license.

// People involved

// - Balazs Galambosi: maintainer (CHANGELOG.txt)

// - Patrick Brunner (patrickb1991@gmail.com)

// - Michael Herf: ssc_pulse Algorithm

function ssc_init() {

if (!document.body) return;

var e = document.body;

var t = document.documentElement;

var n = window.innerHeight;

var r = e.scrollHeight;

ssc_root = document.compatMode.indexOf("CSS") >= 0 ? t : e;

ssc_activeElement = e;

ssc_initdone = true;

if (top != self) {

ssc_frame = true

} else if (r > n && (e.offsetHeight <= n || t.offsetHeight <= n)) {

ssc_root.style.height = "auto";

if (ssc_root.offsetHeight <= n) {

var i = document.createElement("div");

i.style.clear = "both";

e.appendChild(i)

}

if (!ssc_fixedback) {

e.style.backgroundAttachment = "scroll";

t.style.backgroundAttachment = "scroll"

}

if (ssc_keyboardsupport) {

ssc_addEvent("keydown", ssc_keydown)

}

function ssc_scrollArray(e, t, n, r) {

r || (r = 1e3);

ssc_directionCheck(t, n);

ssc_que.push({

x: t,

y: n,

lastX: t < 0 ? .99 : -.99,

lastY: n < 0 ? .99 : -.99,

start: +(new Date)

});

if (ssc_pending) {

return

}

var i = function () {

var s = +(new Date);

var o = 0;

var u = 0;

for (var a = 0; a < ssc_que.length; a++) {

var f = ssc_que[a];

var l = s - f.start;

var c = l >= ssc_animtime;

var h = c ? 1 : l / ssc_animtime;

if (ssc_pulseAlgorithm) {

h = ssc_pulse(h)

}

var p = f.x * h - f.lastX >> 0;

var d = f.y * h - f.lastY >> 0;

o += p;

u += d;

f.lastX += p;

f.lastY += d;

if (c) {

ssc_que.splice(a, 1);

a--

}

if (t) {

var v = e.scrollLeft;

e.scrollLeft += o;

if (o && e.scrollLeft === v) {

t = 0

}

if (n) {

var m = e.scrollTop;

e.scrollTop += u;

if (u && e.scrollTop === m) {

n = 0

}

if (!t && !n) {

ssc_que = []

}

if (ssc_que.length) {

setTimeout(i, r / ssc_framerate + 1)

} else {

ssc_pending = false

}

};

setTimeout(i, 0);

ssc_pending = true

}

function ssc_wheel(e) {

if (!ssc_initdone) {

ssc_init()

}

var t = e.target;

var n = ssc_overflowingAncestor(t);

if (!n || e.defaultPrevented || ssc_isNodeName(ssc_activeElement, "embed") || ssc_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 (Math.abs(r) > 1.2) {

r *= ssc_stepsize / 120

}

if (Math.abs(i) > 1.2) {

i *= ssc_stepsize / 120

}

ssc_scrollArray(n, -r, -i);

e.preventDefault()

}

function ssc_keydown(e) {

var t = e.target;

var n = e.ctrlKey || e.altKey || e.metaKey;

if (/input|textarea|embed/i.test(t.nodeName) || t.isContentEditable || e.defaultPrevented || n) {

return true

}

if (ssc_isNodeName(t, "button") && e.keyCode === ssc_key.spacebar) {

return true

}

var r, i = 0,

s = 0;

var o = ssc_overflowingAncestor(ssc_activeElement);

var u = o.clientHeight;

if (o == document.body) {

u = window.innerHeight

}

switch (e.keyCode) {

case ssc_key.up:

s = -ssc_arrowscroll;

break;

case ssc_key.down:

s = ssc_arrowscroll;

break;

case ssc_key.spacebar:

r = e.shiftKey ? 1 : -1;

s = -r * u * .9;

break;

case ssc_key.pageup:

s = -u * .9;

break;

case ssc_key.pagedown:

s = u * .9;

break;

case ssc_key.home:

s = -o.scrollTop;

break;

case ssc_key.end:

var a = o.scrollHeight - o.scrollTop - u;

s = a > 0 ? a + 10 : 0;

break;

case ssc_key.left:

i = -ssc_arrowscroll;

break;

case ssc_key.right:

i = ssc_arrowscroll;

break;

default:

return true

}

ssc_scrollArray(o, i, s);

e.preventDefault()

}

function ssc_mousedown(e) {

ssc_activeElement = e.target

}

function ssc_setCache(e, t) {

for (var n = e.length; n--;) ssc_cache[ssc_uniqueID(e[n])] = t;

return t

}

function ssc_overflowingAncestor(e) {

var t = [];

var n = ssc_root.scrollHeight;

do {

var r = ssc_cache[ssc_uniqueID(e)];

if (r) {

return ssc_setCache(t, r)

}

t.push(e);

if (n === e.scrollHeight) {

if (!ssc_frame || ssc_root.clientHeight + 10 < n) {

return ssc_setCache(t, document.body)

}

} else if (e.clientHeight + 10 < e.scrollHeight) {

overflow = getComputedStyle(e, "").getPropertyValue("overflow");

if (overflow === "scroll" || overflow === "auto") {

return ssc_setCache(t, e)

}

} while (e = e.parentNode)

}

function ssc_addEvent(e, t, n) {

window.addEventListener(e, t, n || false)

}

function ssc_removeEvent(e, t, n) {

window.removeEventListener(e, t, n || false)

}

function ssc_isNodeName(e, t) {

return e.nodeName.toLowerCase() === t.toLowerCase()

}

function ssc_directionCheck(e, t) {

e = e > 0 ? 1 : -1;

t = t > 0 ? 1 : -1;

if (ssc_direction.x !== e || ssc_direction.y !== t) {

ssc_direction.x = e;

ssc_direction.y = t;

ssc_que = []

}

function ssc_pulse_(e) {

var t, n, r;

e = e * ssc_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 * ssc_pulseNormalize

}

function ssc_pulse(e) {

if (e >= 1) return 1;

if (e <= 0) return 0;

if (ssc_pulseNormalize == 1) {

ssc_pulseNormalize /= ssc_pulse_(1)

}

return ssc_pulse_(e)

}

var ssc_framerate = 150;

var ssc_animtime = 500;

var ssc_stepsize = 150;

var ssc_pulseAlgorithm = true;

var ssc_pulseScale = 6;

var ssc_pulseNormalize = 1;

var ssc_keyboardsupport = true;

var ssc_arrowscroll = 50;

var ssc_frame = false;

var ssc_direction = {

x: 0,

y: 0

};

var ssc_initdone = false;

var ssc_fixedback = true;

var ssc_root = document.documentElement;

var ssc_activeElement;

var ssc_key = {

left: 37,

up: 38,

right: 39,

down: 40,

spacebar: 32,

pageup: 33,

pagedown: 34,

end: 35,

home: 36

};

var ssc_que = [];

var ssc_pending = false;

var ssc_cache = {};

setInterval(function () {

ssc_cache = {}

}, 10 * 1e3);

var ssc_uniqueID = function () {

var e = 0;

return function (t) {

return t.ssc_uniqueID || (t.ssc_uniqueID = e++)

}

}();

var ischrome = /chrome/.test(navigator.userAgent.toLowerCase());

if (ischrome) {

ssc_addEvent("mousedown", ssc_mousedown);

ssc_addEvent("mousewheel", ssc_wheel);

ssc_addEvent("load", ssc_init)

}

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