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✏️ Editing: SmoothScroll.min.js

// SmoothScroll for websites v1.2.1
// Licensed under the terms of the MIT license.

// People involved
//  - Balazs Galambosi (maintainer)  
//  - Michael Herf     (Pulse Algorithm)

(function(){
  
// Scroll Variables (tweakable)
var defaultOptions = {

// Scrolling Core
    frameRate        : 150, // [Hz]
    animationTime    : 1800, // [px]
    stepSize         : 85, // [px]

// Pulse (less tweakable)
    // ratio of "tail" to "acceleration"
    pulseAlgorithm   : true,
    pulseScale       : 8,
    pulseNormalize   : 1,

// Acceleration
    accelerationDelta : 20,  // 20
    accelerationMax   : 1,   // 1

// Keyboard Settings
    keyboardSupport   : true,  // option
    arrowScroll       : 50,     // [px]

// Other
    touchpadSupport   : true,
    fixedBackground   : true, 
    excluded          : ""    
};

var options = defaultOptions;

// Other Variables
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 };

/***********************************************
 * SETTINGS
 ***********************************************/

var options = defaultOptions;

/***********************************************
 * INITIALIZE
 ***********************************************/

/**
 * Tests if smooth scrolling is allowed. Shuts down everything if not.
 */
function initTest() {

var disableKeyboard = false; 
    
    // disable keyboard support if anything above requested it
    if (disableKeyboard) {
        removeEvent("keydown", keydown);
    }

if (options.keyboardSupport && !disableKeyboard) {
        addEvent("keydown", keydown);
    }
}

/**
 * Sets up scrolls array, determines if frames are involved.
 */
function init() {
  
    if (!document.body) return;

var body = document.body;
    var html = document.documentElement;
    var windowHeight = window.innerHeight; 
    var scrollHeight = body.scrollHeight;
    
    // check compat mode for root element
    root = (document.compatMode.indexOf('CSS') >= 0) ? html : body;
    activeElement = body;
    
    initTest();
    initDone = true;

// Checks if this script is running in a frame
    if (top != self) {
        isFrame = true;
    }

/**
     * This fixes a bug where the areas left and right to 
     * the content does not trigger the onmousewheel event
     * on some pages. e.g.: html, body { height: 100% }
     */
    else if (scrollHeight > windowHeight &&
            (body.offsetHeight <= windowHeight || 
             html.offsetHeight <= windowHeight)) {

html.style.height = 'auto';
        //setTimeout(refresh, 10);

// clearfix
        if (root.offsetHeight <= windowHeight) {
            var underlay = document.createElement("div"); 	
            underlay.style.clear = "both";
            body.appendChild(underlay);
        }
    }

// disable fixed background
    if (!options.fixedBackground && !isExcluded) {
        body.style.backgroundAttachment = "scroll";
        html.style.backgroundAttachment = "scroll";
    }
}

/************************************************
 * SCROLLING 
 ************************************************/
 
var que = [];
var pending = false;
var lastScroll = +new Date;

/**
 * Pushes scroll actions to the scrolling queue.
 */
function scrollArray(elem, left, top, delay) {
    
    delay || (delay = 1000);
    directionCheck(left, top);

if (options.accelerationMax != 1) {
        var now = +new Date;
        var elapsed = now - lastScroll;
        if (elapsed < options.accelerationDelta) {
            var factor = (1 + (30 / elapsed)) / 2;
            if (factor > 1) {
                factor = Math.min(factor, options.accelerationMax);
                left *= factor;
                top  *= factor;
            }
        }
        lastScroll = +new Date;
    }          
    
    // push a scroll command
    que.push({
        x: left, 
        y: top, 
        lastX: (left < 0) ? 0.99 : -0.99,
        lastY: (top  < 0) ? 0.99 : -0.99, 
        start: +new Date
    });
        
    // don't act if there's a pending queue
    if (pending) {
        return;
    }

// scroll left and top
        if (scrollWindow) {
            window.scrollBy(scrollX, scrollY);
        } 
        else {
            if (scrollX) elem.scrollLeft += scrollX;
            if (scrollY) elem.scrollTop  += scrollY;                    
        }
        
        // clean up if there's nothing left to do
        if (!left && !top) {
            que = [];
        }
        
        if (que.length) { 
            requestFrame(step, elem, (delay / options.frameRate + 1)); 
        } else { 
            pending = false;
        }
    };
    
    // start a new queue of actions
    requestFrame(step, elem, 0);
    pending = true;
}

/***********************************************
 * EVENTS
 ***********************************************/

/**
 * Mouse wheel handler.
 * @param {Object} event
 */
function wheel(event) {

if (!initDone) {
        init();
    }
    
    var target = event.target;
    var overflowing = overflowingAncestor(target);
    
    // use default if there's no overflowing
    // element or default action is prevented    
    if (!overflowing || event.defaultPrevented ||
        isNodeName(activeElement, "embed") ||
       (isNodeName(target, "embed") && /\.pdf/i.test(target.src))) {
        return true;
    }

var deltaX = event.wheelDeltaX || 0;
    var deltaY = event.wheelDeltaY || 0;
    
    // use wheelDelta if deltaX/Y is not available
    if (!deltaX && !deltaY) {
        deltaY = event.wheelDelta || 0;
    }

// check if it's a touchpad scroll that should be ignored
    if (!options.touchpadSupport && isTouchpad(deltaY)) {
        return true;
    }

// scale by step size
    // delta is 120 most of the time
    // synaptics seems to send 1 sometimes
    if (Math.abs(deltaX) > 1.2) {
        deltaX *= options.stepSize / 120;
    }
    if (Math.abs(deltaY) > 1.2) {
        deltaY *= options.stepSize / 120;
    }
    
    scrollArray(overflowing, -deltaX, -deltaY);
    event.preventDefault();
}

/**
 * Keydown event handler.
 * @param {Object} event
 */
function keydown(event) {

var target   = event.target;
    var modifier = event.ctrlKey || event.altKey || event.metaKey || 
                  (event.shiftKey && event.keyCode !== key.spacebar);
    
    // do nothing if user is editing text
    // or using a modifier key (except shift)
    // or in a dropdown
    if ( /input|textarea|select|embed/i.test(target.nodeName) ||
         target.isContentEditable || 
         event.defaultPrevented   ||
         modifier ) {
      return true;
    }
    // spacebar should trigger button press
    if (isNodeName(target, "button") &&
        event.keyCode === key.spacebar) {
      return true;
    }
    
    var shift, x = 0, y = 0;
    var elem = overflowingAncestor(activeElement);
    var clientHeight = elem.clientHeight;

if (elem == document.body) {
        clientHeight = window.innerHeight;
    }

switch (event.keyCode) {
        case key.up:
            y = -options.arrowScroll;
            break;
        case key.down:
            y = options.arrowScroll;
            break;         
        case key.spacebar: // (+ shift)
            shift = event.shiftKey ? 1 : -1;
            y = -shift * clientHeight * 0.9;
            break;
        case key.pageup:
            y = -clientHeight * 0.9;
            break;
        case key.pagedown:
            y = clientHeight * 0.9;
            break;
        case key.home:
            y = -elem.scrollTop;
            break;
        case key.end:
            var damt = elem.scrollHeight - elem.scrollTop - clientHeight;
            y = (damt > 0) ? damt+10 : 0;
            break;
        case key.left:
            x = -options.arrowScroll;
            break;
        case key.right:
            x = options.arrowScroll;
            break;            
        default:
            return true; // a key we don't care about
    }

scrollArray(elem, x, y);
    event.preventDefault();
}

/**
 * Mousedown event only for updating activeElement
 */
function mousedown(event) {
    activeElement = event.target;
}

/***********************************************
 * OVERFLOW
 ***********************************************/
 
var cache = {}; // cleared out every once in while
setInterval(function () { cache = {}; }, 10 * 1000);

var uniqueID = (function () {
    var i = 0;
    return function (el) {
        return el.uniqueID || (el.uniqueID = i++);
    };
})();

function setCache(elems, overflowing) {
    for (var i = elems.length; i--;)
        cache[uniqueID(elems[i])] = overflowing;
    return overflowing;
}

/***********************************************
 * HELPERS
 ***********************************************/

function addEvent(type, fn, bubble) {
    window.addEventListener(type, fn, (bubble||false));
}

function removeEvent(type, fn, bubble) {
    window.removeEventListener(type, fn, (bubble||false));  
}

function isNodeName(el, tag) {
    return (el.nodeName||"").toLowerCase() === tag.toLowerCase();
}

function directionCheck(x, y) {
    x = (x > 0) ? 1 : -1;
    y = (y > 0) ? 1 : -1;
    if (direction.x !== x || direction.y !== y) {
        direction.x = x;
        direction.y = y;
        que = [];
        lastScroll = 0;
    }
}

var deltaBufferTimer;

function isTouchpad(deltaY) {
    if (!deltaY) return;
    deltaY = Math.abs(deltaY)
    deltaBuffer.push(deltaY);
    deltaBuffer.shift();
    clearTimeout(deltaBufferTimer);

var allEquals    = (deltaBuffer[0] == deltaBuffer[1] && 
                        deltaBuffer[1] == deltaBuffer[2]);
    var allDivisable = (isDivisible(deltaBuffer[0], 120) &&
                        isDivisible(deltaBuffer[1], 120) &&
                        isDivisible(deltaBuffer[2], 120));
    return !(allEquals || allDivisable);
}

function isDivisible(n, divisor) {
    return (Math.floor(n / divisor) == n / divisor);
}

var requestFrame = (function () {
      return  window.requestAnimationFrame       || 
              window.webkitRequestAnimationFrame || 
              function (callback, element, delay) {
                  window.setTimeout(callback, delay || (1000/60));
              };
})();

/***********************************************
 * PULSE
 ***********************************************/
 
/**
 * Viscous fluid with a pulse for part and decay for the rest.
 * - Applies a fixed force over an interval (a damped acceleration), and
 * - Lets the exponential bleed away the velocity over a longer interval
 * - Michael Herf, http://stereopsis.com/stopping/
 */
function pulse_(x) {
    var val, start, expx;
    // test
    x = x * options.pulseScale;
    if (x < 1) { // acceleartion
        val = x - (1 - Math.exp(-x));
    } else {     // tail
        // the previous animation ended here:
        start = Math.exp(-1);
        // simple viscous drag
        x -= 1;
        expx = 1 - Math.exp(-x);
        val = start + (expx * (1 - start));
    }
    return val * options.pulseNormalize;
}

function pulse(x) {
    if (x >= 1) return 1;
    if (x <= 0) return 0;

if (options.pulseNormalize == 1) {
        options.pulseNormalize /= pulse_(1);
    }
    return pulse_(x);
}

var isChrome = /chrome/i.test(window.navigator.userAgent);
var isMouseWheelSupported = 'onmousewheel' in document;

if (isMouseWheelSupported && isChrome) {
	addEvent("mousedown", mousedown);
	addEvent("mousewheel", wheel);
	addEvent("load", init);
};

})();

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