iscroll.js

/*
 * Real3D FlipBook [https://real3dflipbook.com]
 * @author creativeinteractivemedia [https://codecanyon.net/user/creativeinteractivemedia/portfolio]
 * @version 4.10
 * @date 2025-05-15
 */
/*! iScroll v5.2.0-snapshot ~ (c) 2008-2017 Matteo Spinelli ~ http://cubiq.org/license */
(function (window, document, Math) {
    var rAF =
        window.requestAnimationFrame ||
        window.webkitRequestAnimationFrame ||
        window.mozRequestAnimationFrame ||
        window.oRequestAnimationFrame ||
        window.msRequestAnimationFrame ||
        function (callback) {
            window.setTimeout(callback, 1000 / 60);
        };

    var utils = (function () {
        var me = {};

        var _elementStyle = document.createElement('div').style;
        var _vendor = (function () {
            var vendors = ['t', 'webkitT', 'MozT', 'msT', 'OT'];
            var transform;
            var i = 0;
            var l = vendors.length;

            for (; i < l; i++) {
                transform = vendors[i] + 'ransform';
                if (transform in _elementStyle) {
                    return vendors[i].substr(0, vendors[i].length - 1);
                }
            }

            return false;
        })();

        function _prefixStyle(style) {
            if (_vendor === false) {
                return false;
            }
            if (_vendor === '') {
                return style;
            }
            return _vendor + style.charAt(0).toUpperCase() + style.substr(1);
        }

        me.getTime =
            Date.now ||
            function getTime() {
                return new Date().getTime();
            };

        me.extend = function (target, obj) {
            for (var i in obj) {
                target[i] = obj[i];
            }
        };

        me.addEvent = function (el, type, fn, capture) {
            el.addEventListener(type, fn, !!capture);
        };

        me.removeEvent = function (el, type, fn, capture) {
            el.removeEventListener(type, fn, !!capture);
        };

        me.prefixPointerEvent = function (pointerEvent) {
            return window.MSPointerEvent
                ? 'MSPointer' + pointerEvent.charAt(7).toUpperCase() + pointerEvent.substr(8)
                : pointerEvent;
        };

        me.momentum = function (current, start, time, lowerMargin, wrapperSize, deceleration) {
            var distance = current - start;
            var speed = Math.abs(distance) / time;
            var destination;
            var duration;

            deceleration = deceleration === undefined ? 0.0006 : deceleration;

            destination = current + ((speed * speed) / (2 * deceleration)) * (distance < 0 ? -1 : 1);
            duration = speed / deceleration;

            if (destination < lowerMargin) {
                destination = wrapperSize ? lowerMargin - (wrapperSize / 2.5) * (speed / 8) : lowerMargin;
                distance = Math.abs(destination - current);
                duration = distance / speed;
            } else if (destination > 0) {
                destination = wrapperSize ? (wrapperSize / 2.5) * (speed / 8) : 0;
                distance = Math.abs(current) + destination;
                duration = distance / speed;
            }

            return {
                destination: Math.round(destination),
                duration: duration,
            };
        };

        var _transform = _prefixStyle('transform');

        me.extend(me, {
            hasTransform: _transform !== false,
            hasPerspective: _prefixStyle('perspective') in _elementStyle,
            hasTouch: 'ontouchstart' in window,
            hasPointer: !!(window.PointerEvent || window.MSPointerEvent), // IE10 is prefixed
            hasTransition: _prefixStyle('transition') in _elementStyle,
        });

        /*
    This should find all Android browsers lower than build 535.19 (both stock browser and webview)
    - galaxy S2 is ok
      - 2.3.6 : `AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1`
      - 4.0.4 : `AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30`
     - galaxy S3 is badAndroid (stock brower, webview)
       `AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30`
     - galaxy S4 is badAndroid (stock brower, webview)
       `AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30`
     - galaxy S5 is OK
       `AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Mobile Safari/537.36 (Chrome/)`
     - galaxy S6 is OK
       `AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Mobile Safari/537.36 (Chrome/)`
    */
        me.isBadAndroid = (function () {
            var appVersion = window.navigator.appVersion;
            // Android browser is not a chrome browser.
            if (/Android/.test(appVersion) && !/Chrome\/\d/.test(appVersion)) {
                var safariVersion = appVersion.match(/Safari\/(\d+.\d)/);
                if (safariVersion && typeof safariVersion === 'object' && safariVersion.length >= 2) {
                    return parseFloat(safariVersion[1]) < 535.19;
                } else {
                    return true;
                }
            } else {
                return false;
            }
        })();

        me.extend((me.style = {}), {
            transform: _transform,
            transitionTimingFunction: _prefixStyle('transitionTimingFunction'),
            transitionDuration: _prefixStyle('transitionDuration'),
            transitionDelay: _prefixStyle('transitionDelay'),
            transformOrigin: _prefixStyle('transformOrigin'),
            touchAction: _prefixStyle('touchAction'),
        });

        me.hasClass = function (e, c) {
            var re = new RegExp('(^|\\s)' + c + '(\\s|$)');
            return re.test(e.className);
        };

        me.addClass = function (e, c) {
            if (me.hasClass(e, c)) {
                return;
            }

            var newclass = e.className.split(' ');
            newclass.push(c);
            e.className = newclass.join(' ');
        };

        me.removeClass = function (e, c) {
            if (!me.hasClass(e, c)) {
                return;
            }

            var re = new RegExp('(^|\\s)' + c + '(\\s|$)', 'g');
            e.className = e.className.replace(re, ' ');
        };

        me.offset = function (el) {
            var left = -el.offsetLeft;
            var top = -el.offsetTop;

            // jshint -W084
            while ((el = el.offsetParent)) {
                left -= el.offsetLeft;
                top -= el.offsetTop;
            }
            // jshint +W084

            /*custom*/
            return { left: 0, top: 0 };
            /*end*/

            return {
                left: left,
                top: top,
            };
        };

        me.preventDefaultException = function (el, exceptions) {
            for (var i in exceptions) {
                if (exceptions[i].test(el[i])) {
                    return true;
                }
            }

            return false;
        };

        me.extend((me.eventType = {}), {
            touchstart: 1,
            touchmove: 1,
            touchend: 1,

            mousedown: 2,
            mousemove: 2,
            mouseup: 2,

            pointerdown: 3,
            pointermove: 3,
            pointerup: 3,

            MSPointerDown: 3,
            MSPointerMove: 3,
            MSPointerUp: 3,
        });

        me.extend((me.ease = {}), {
            quadratic: {
                style: 'cubic-bezier(0.25, 0.46, 0.45, 0.94)',
                fn: function (k) {
                    return k * (2 - k);
                },
            },
            circular: {
                style: 'cubic-bezier(0.1, 0.57, 0.1, 1)', // Not properly "circular" but this looks better, it should be (0.075, 0.82, 0.165, 1)
                fn: function (k) {
                    return Math.sqrt(1 - --k * k);
                },
            },
            back: {
                style: 'cubic-bezier(0.175, 0.885, 0.32, 1.275)',
                fn: function (k) {
                    var b = 4;
                    return (k = k - 1) * k * ((b + 1) * k + b) + 1;
                },
            },
            bounce: {
                style: '',
                fn: function (k) {
                    if ((k /= 1) < 1 / 2.75) {
                        return 7.5625 * k * k;
                    } else if (k < 2 / 2.75) {
                        return 7.5625 * (k -= 1.5 / 2.75) * k + 0.75;
                    } else if (k < 2.5 / 2.75) {
                        return 7.5625 * (k -= 2.25 / 2.75) * k + 0.9375;
                    } else {
                        return 7.5625 * (k -= 2.625 / 2.75) * k + 0.984375;
                    }
                },
            },
            elastic: {
                style: '',
                fn: function (k) {
                    var f = 0.22;
                    var e = 0.4;

                    if (k === 0) {
                        return 0;
                    }
                    if (k == 1) {
                        return 1;
                    }

                    return e * Math.pow(2, -10 * k) * Math.sin(((k - f / 4) * (2 * Math.PI)) / f) + 1;
                },
            },
        });

        me.tap = function (e, eventName) {
            var ev = document.createEvent('Event');
            ev.initEvent(eventName, true, true);
            ev.pageX = e.pageX;
            ev.pageY = e.pageY;
            e.target.dispatchEvent(ev);
        };

        me.click = function (e) {
            var target = e.target;
            var ev;

            if (!/(SELECT|INPUT|TEXTAREA)/i.test(target.tagName)) {
                // https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/initMouseEvent
                // initMouseEvent is deprecated.
                ev = document.createEvent(window.MouseEvent ? 'MouseEvents' : 'Event');
                ev.initEvent('click', true, true);
                ev.view = e.view || window;
                ev.detail = 1;
                ev.screenX = target.screenX || 0;
                ev.screenY = target.screenY || 0;
                ev.clientX = target.clientX || 0;
                ev.clientY = target.clientY || 0;
                ev.ctrlKey = !!e.ctrlKey;
                ev.altKey = !!e.altKey;
                ev.shiftKey = !!e.shiftKey;
                ev.metaKey = !!e.metaKey;
                ev.button = 0;
                ev.relatedTarget = null;
                ev._constructed = true;
                target.dispatchEvent(ev);
            }
        };

        me.getTouchAction = function (eventPassthrough, addPinch) {
            var touchAction = 'none';
            if (eventPassthrough === 'vertical') {
                touchAction = 'pan-y';
            } else if (eventPassthrough === 'horizontal') {
                touchAction = 'pan-x';
            }
            if (addPinch && touchAction != 'none') {
                // add pinch-zoom support if the browser supports it, but if not (eg. Chrome <55) do nothing
                touchAction += ' pinch-zoom';
            }
            return touchAction;
        };

        me.getRect = function (el) {
            if (el instanceof SVGElement) {
                var rect = el.getBoundingClientRect();
                return {
                    top: rect.top,
                    left: rect.left,
                    width: rect.width,
                    height: rect.height,
                };
            } else {
                return {
                    top: el.offsetTop,
                    left: el.offsetLeft,
                    width: el.offsetWidth,
                    height: el.offsetHeight,
                };
            }
        };

        return me;
    })();
    function IScroll(el, options) {
        this.wrapper = typeof el == 'string' ? document.querySelector(el) : el;
        this.scroller = this.wrapper.children[0];
        this.scrollerStyle = this.scroller.style; // cache style for better performance

        this.options = {
            zoomMin: 1,
            zoomMax: 4,
            startZoom: 1,

            resizeScrollbars: true,

            mouseWheelSpeed: 20,
            mouseWheelTimeout: 400,

            snapThreshold: 0.334,

            // INSERT POINT: OPTIONS
            disablePointer: !utils.hasPointer,
            disableTouch: utils.hasPointer || !utils.hasTouch,
            disableMouse: utils.hasPointer || utils.hasTouch,
            startX: 0,
            startY: 0,
            scrollY: true,
            directionLockThreshold: 5,
            momentum: true,

            bounce: true,
            bounceTime: 600,
            bounceEasing: '',

            preventDefault: true,
            preventDefaultException: { tagName: /^(INPUT|TEXTAREA|BUTTON|SELECT)$/ },

            HWCompositing: true,
            useTransition: true,
            useTransform: true,
            bindToWrapper: typeof window.onmousedown === 'undefined',
        };

        for (var i in options) {
            this.options[i] = options[i];
        }

        // Normalize options
        this.translateZ = this.options.HWCompositing && utils.hasPerspective ? ' translateZ(0)' : '';

        this.options.useTransition = utils.hasTransition && this.options.useTransition;
        this.options.useTransform = utils.hasTransform && this.options.useTransform;

        this.options.eventPassthrough =
            this.options.eventPassthrough === true ? 'vertical' : this.options.eventPassthrough;
        this.options.preventDefault = !this.options.eventPassthrough && this.options.preventDefault;

        // If you want eventPassthrough I have to lock one of the axes
        this.options.scrollY = this.options.eventPassthrough == 'vertical' ? false : this.options.scrollY;
        this.options.scrollX = this.options.eventPassthrough == 'horizontal' ? false : this.options.scrollX;

        // With eventPassthrough we also need lockDirection mechanism
        this.options.freeScroll = this.options.freeScroll && !this.options.eventPassthrough;
        this.options.directionLockThreshold = this.options.eventPassthrough ? 0 : this.options.directionLockThreshold;

        this.options.bounceEasing =
            typeof this.options.bounceEasing == 'string'
                ? utils.ease[this.options.bounceEasing] || utils.ease.circular
                : this.options.bounceEasing;

        this.options.resizePolling = this.options.resizePolling === undefined ? 60 : this.options.resizePolling;

        if (this.options.tap === true) {
            this.options.tap = 'tap';
        }

        // https://github.com/cubiq/iscroll/issues/1029
        if (!this.options.useTransition && !this.options.useTransform) {
            if (!/relative|absolute/i.test(this.scrollerStyle.position)) {
                this.scrollerStyle.position = 'relative';
            }
        }

        if (this.options.shrinkScrollbars == 'scale') {
            this.options.useTransition = false;
        }

        this.options.invertWheelDirection = this.options.invertWheelDirection ? -1 : 1;

        // INSERT POINT: NORMALIZATION

        // Some defaults
        this.x = 0;
        this.y = 0;
        this.directionX = 0;
        this.directionY = 0;
        this._events = {};

        this.scale = Math.min(Math.max(this.options.startZoom, this.options.zoomMin), this.options.zoomMax);

        // INSERT POINT: DEFAULTS

        this._init();
        this.refresh();

        this.scrollTo(this.options.startX, this.options.startY);
        this.enable();
    }

    IScroll.prototype = {
        version: '5.2.0-snapshot',

        _init: function () {
            this._initEvents();

            if (this.options.zoom) {
                this._initZoom();
            }

            if (this.options.scrollbars || this.options.indicators) {
                this._initIndicators();
            }

            if (this.options.mouseWheel) {
                this._initWheel();
            }

            if (this.options.snap) {
                this._initSnap();
            }

            if (this.options.keyBindings) {
                this._initKeys();
            }

            // INSERT POINT: _init
        },

        destroy: function () {
            this._initEvents(true);
            clearTimeout(this.resizeTimeout);
            this.resizeTimeout = null;
            this._execEvent('destroy');
        },

        _transitionEnd: function (e) {
            if (e.target != this.scroller || !this.isInTransition) {
                return;
            }

            this._transitionTime();
            if (!this.resetPosition(this.options.bounceTime)) {
                this.isInTransition = false;
                this._execEvent('scrollEnd');
            }
        },

        _start: function (e) {
            //ignore secondary touch
            if (e.type == 'pointerdown' && !e.isPrimary) {
                return;
            }
            // React to left mouse button only
            if (utils.eventType[e.type] != 1) {
                // for button property
                // http://unixpapa.com/js/mouse.html
                var button;
                if (!e.which) {
                    /* IE case */
                    button = e.button < 2 ? 0 : e.button == 4 ? 1 : 2;
                } else {
                    /* All others */
                    button = e.button;
                }
                if (button !== 0) {
                    return;
                }
            }

            if (!this.enabled || (this.initiated && utils.eventType[e.type] !== this.initiated)) {
                return;
            }

            if (
                this.options.preventDefault &&
                !utils.isBadAndroid &&
                !utils.preventDefaultException(e.target, this.options.preventDefaultException)
            ) {
                e.preventDefault();
            }

            var point = e.touches ? e.touches[0] : e;
            var pos;

            this.initiated = utils.eventType[e.type];
            this.moved = false;
            this.distX = 0;
            this.distY = 0;
            this.directionX = 0;
            this.directionY = 0;
            this.directionLocked = 0;

            this.startTime = utils.getTime();

            if (this.options.useTransition && this.isInTransition) {
                this._transitionTime();
                this.isInTransition = false;
                pos = this.getComputedPosition();
                this._translate(Math.round(pos.x), Math.round(pos.y));
                this._execEvent('scrollEnd');
            } else if (!this.options.useTransition && this.isAnimating) {
                this.isAnimating = false;
                this._execEvent('scrollEnd');
            }

            this.startX = this.x;
            this.startY = this.y;
            this.absStartX = this.x;
            this.absStartY = this.y;
            this.pointX = point.pageX;
            this.pointY = point.pageY;

            this._execEvent('beforeScrollStart');
        },

        _move: function (e) {
            if (!this.enabled || utils.eventType[e.type] !== this.initiated) {
                return;
            }

            //ignore secondary touch
            if (e.type == 'pointermove' && !e.isPrimary) {
                return;
            }

            if (this.options.preventDefault) {
                // increases performance on Android? TODO: check!
                e.preventDefault();
            }

            var point = e.touches ? e.touches[0] : e;
            var deltaX = point.pageX - this.pointX;
            var deltaY = point.pageY - this.pointY;
            var timestamp = utils.getTime();
            var newX;
            var newY;
            var absDistX;
            var absDistY;

            this.pointX = point.pageX;
            this.pointY = point.pageY;

            this.distX += deltaX;
            this.distY += deltaY;
            absDistX = Math.abs(this.distX);
            absDistY = Math.abs(this.distY);

            // We need to move at least 10 pixels for the scrolling to initiate
            if (timestamp - this.endTime > 300 && absDistX < 10 && absDistY < 10) {
                return;
            }

            // If you are scrolling in one direction lock the other
            if (!this.directionLocked && !this.options.freeScroll) {
                if (absDistX > absDistY + this.options.directionLockThreshold) {
                    this.directionLocked = 'h'; // lock horizontally
                } else if (absDistY >= absDistX + this.options.directionLockThreshold) {
                    this.directionLocked = 'v'; // lock vertically
                } else {
                    this.directionLocked = 'n'; // no lock
                }
            }

            if (this.directionLocked == 'h') {
                if (this.options.eventPassthrough == 'vertical') {
                    e.preventDefault();
                } else if (this.options.eventPassthrough == 'horizontal') {
                    this.initiated = false;
                    return;
                }

                deltaY = 0;
            } else if (this.directionLocked == 'v') {
                if (this.options.eventPassthrough == 'horizontal') {
                    e.preventDefault();
                } else if (this.options.eventPassthrough == 'vertical') {
                    this.initiated = false;
                    return;
                }

                deltaX = 0;
            }

            deltaX = this.hasHorizontalScroll ? deltaX : 0;
            deltaY = this.hasVerticalScroll ? deltaY : 0;

            newX = this.x + deltaX;
            newY = this.y + deltaY;

            // Slow down if outside of the boundaries
            if (newX > 0 || newX < this.maxScrollX) {
                newX = this.options.bounce ? this.x + deltaX / 3 : newX > 0 ? 0 : this.maxScrollX;
            }
            if (newY > 0 || newY < this.maxScrollY) {
                newY = this.options.bounce ? this.y + deltaY / 3 : newY > 0 ? 0 : this.maxScrollY;
            }

            this.directionX = deltaX > 0 ? -1 : deltaX < 0 ? 1 : 0;
            this.directionY = deltaY > 0 ? -1 : deltaY < 0 ? 1 : 0;

            if (!this.moved) {
                this._execEvent('scrollStart');
            }

            this.moved = true;

            this._translate(newX, newY);

            /* REPLACE START: _move */

            if (timestamp - this.startTime > 300) {
                this.startTime = timestamp;
                this.startX = this.x;
                this.startY = this.y;
            }

            /* REPLACE END: _move */
        },

        _end: function (e) {
            if (!this.enabled || utils.eventType[e.type] !== this.initiated) {
                return;
            }

            //ignore secondary touch
            if (e.type == 'pointerup' && !e.isPrimary) {
                return;
            }

            if (
                this.options.preventDefault &&
                !utils.preventDefaultException(e.target, this.options.preventDefaultException)
            ) {
                e.preventDefault();
            }

            var point = e.changedTouches ? e.changedTouches[0] : e;
            var momentumX;
            var momentumY;
            var duration = utils.getTime() - this.startTime;
            var newX = Math.round(this.x);
            var newY = Math.round(this.y);
            var distanceX = Math.abs(newX - this.startX);
            var distanceY = Math.abs(newY - this.startY);
            var time = 0;
            var easing = '';

            this.isInTransition = 0;
            this.initiated = 0;
            this.endTime = utils.getTime();

            // reset if we are outside of the boundaries
            if (this.resetPosition(this.options.bounceTime)) {
                return;
            }

            this.scrollTo(newX, newY); // ensures that the last position is rounded

            // we scrolled less than 10 pixels
            if (!this.moved) {
                if (this.options.tap) {
                    utils.tap(e, this.options.tap);
                }

                if (this.options.click) {
                    utils.click(e);
                }

                this._execEvent('scrollCancel');
                return;
            }

            if (this._events.flick && duration < 200 && distanceX < 100 && distanceY < 100) {
                this._execEvent('flick');
                return;
            }

            // start momentum animation if needed
            if (this.options.momentum && duration < 300) {
                momentumX = this.hasHorizontalScroll
                    ? utils.momentum(
                          this.x,
                          this.startX,
                          duration,
                          this.maxScrollX,
                          this.options.bounce ? this.wrapperWidth : 0,
                          this.options.deceleration
                      )
                    : { destination: newX, duration: 0 };
                momentumY = this.hasVerticalScroll
                    ? utils.momentum(
                          this.y,
                          this.startY,
                          duration,
                          this.maxScrollY,
                          this.options.bounce ? this.wrapperHeight : 0,
                          this.options.deceleration
                      )
                    : { destination: newY, duration: 0 };
                newX = momentumX.destination;
                newY = momentumY.destination;
                time = Math.max(momentumX.duration, momentumY.duration);
                this.isInTransition = 1;
            }

            if (this.options.snap) {
                var snap = this._nearestSnap(newX, newY);
                this.currentPage = snap;
                time =
                    this.options.snapSpeed ||
                    Math.max(
                        Math.max(Math.min(Math.abs(newX - snap.x), 1000), Math.min(Math.abs(newY - snap.y), 1000)),
                        300
                    );
                newX = snap.x;
                newY = snap.y;

                this.directionX = 0;
                this.directionY = 0;
                easing = this.options.bounceEasing;
            }

            // INSERT POINT: _end

            if (newX != this.x || newY != this.y) {
                // change easing function when scroller goes out of the boundaries
                if (newX > 0 || newX < this.maxScrollX || newY > 0 || newY < this.maxScrollY) {
                    easing = utils.ease.quadratic;
                }

                this.scrollTo(newX, newY, time, easing);

                //custom
                this._execEvent('scrollToPage');
                return;
            }

            this._execEvent('scrollEnd');
        },

        _resize: function () {
            var that = this;

            clearTimeout(this.resizeTimeout);

            this.resizeTimeout = setTimeout(function () {
                that.refresh();
            }, this.options.resizePolling);
        },

        resetPosition: function (time) {
            var x = this.x;
            var y = this.y;

            time = time || 0;

            if (!this.hasHorizontalScroll || this.x > 0) {
                x = 0;
                // custom start
                if (this.options.keepInCenterH && this.getScrollerWidth() * this.scale < this.wrapperWidth) {
                    x = this.wrapperWidth / 2 - (this.getScrollerWidth() * this.scale) / 2;
                }
                // custom end
            } else if (this.x < this.maxScrollX) {
                x = this.maxScrollX;
            }

            if (!this.hasVerticalScroll || this.y > 0) {
                y = 0;
                // custom start
                if (this.options.keepInCenterV && this.getScrollerHeight() * this.scale < this.wrapperHeight) {
                    y = this.wrapperHeight / 2 - (this.getScrollerHeight() * this.scale) / 2;
                }
                // custom end
            } else if (this.y < this.maxScrollY) {
                y = this.maxScrollY;
            }

            if (x == this.x && y == this.y) {
                return false;
            }

            this.scrollTo(x, y, time, this.options.bounceEasing);

            return true;
        },

        disable: function () {
            this.enabled = false;
        },

        enable: function () {
            this.enabled = true;
        },

        //custom

        setScrollerSize: function (w, h) {
            this.scrollerW = w;
            this.scrollerH = h;
        },

        setWrapperOffset: function (left, top) {
            this.wrapperOffsetLeft = left;
            this.wrapperOffsetTop = top;
        },

        //custom end

        refresh: function () {
            utils.getRect(this.wrapper); // Force reflow

            this.wrapperWidth = this.wrapper.clientWidth;
            this.wrapperHeight = this.wrapper.clientHeight;

            var rect = utils.getRect(this.scroller);
            if (this.scrollerW) {
                rect.width = this.scrollerW;
            }
            if (this.scrollerH) {
                rect.height = this.scrollerH;
            }
            /* REPLACE START: refresh */
            this.scrollerWidth = Math.round(rect.width * this.scale);
            this.scrollerHeight = Math.round(rect.height * this.scale);

            this.maxScrollX = this.wrapperWidth - this.scrollerWidth;
            this.maxScrollY = this.wrapperHeight - this.scrollerHeight;
            /* REPLACE END: refresh */

            this.hasHorizontalScroll = this.options.scrollX && this.maxScrollX < 0;
            this.hasVerticalScroll = this.options.scrollY && this.maxScrollY < 0;

            if (!this.hasHorizontalScroll) {
                this.maxScrollX = 0;
                this.scrollerWidth = this.wrapperWidth;
            }

            if (!this.hasVerticalScroll) {
                this.maxScrollY = 0;
                this.scrollerHeight = this.wrapperHeight;
            }

            this.endTime = 0;
            this.directionX = 0;
            this.directionY = 0;

            if (utils.hasPointer && !this.options.disablePointer) {
                // The wrapper should have `touchAction` property for using pointerEvent.
                this.wrapper.style[utils.style.touchAction] = utils.getTouchAction(this.options.eventPassthrough, true);

                // case. not support 'pinch-zoom'
                // https://github.com/cubiq/iscroll/issues/1118#issuecomment-270057583
                if (!this.wrapper.style[utils.style.touchAction]) {
                    this.wrapper.style[utils.style.touchAction] = utils.getTouchAction(
                        this.options.eventPassthrough,
                        false
                    );
                }
            }
            this.wrapperOffset = utils.offset(this.wrapper);
            if (this.wrapperOffsetLeft) {
                this.wrapperOffset.left = this.wrapperOffsetLeft;
            }
            if (this.wrapperOffsetTop) {
                this.wrapperOffset.top = this.wrapperOffsetTop;
            }

            this._execEvent('refresh');

            this.resetPosition();

            // INSERT POINT: _refresh
        },

        on: function (type, fn) {
            if (!this._events[type]) {
                this._events[type] = [];
            }

            this._events[type].push(fn);
        },

        off: function (type, fn) {
            if (!this._events[type]) {
                return;
            }

            var index = this._events[type].indexOf(fn);

            if (index > -1) {
                this._events[type].splice(index, 1);
            }
        },

        _execEvent: function (type) {
            if (!this._events[type]) {
                return;
            }

            var i = 0;
            var l = this._events[type].length;

            if (!l) {
                return;
            }

            for (; i < l; i++) {
                this._events[type][i].apply(this, [].slice.call(arguments, 1));
            }
        },

        scrollBy: function (x, y, time, easing) {
            x = this.x + x;
            y = this.y + y;
            time = time || 0;

            this.scrollTo(x, y, time, easing);
        },

        //custom

        getScrollerWidth: function () {
            return this.scrollerW !== undefined ? this.scrollerW : this.scroller.offsetWidth;
        },

        getScrollerHeight: function () {
            return this.scrollerH !== undefined ? this.scrollerH : this.scroller.offsetHeight;
        },

        //end custom

        scrollTo: function (x, y, time, easing) {
            /*custom*/

            if (this.wrapperWidth == 0 || this.wrapperHeight == 0) {
                return;
            }

            if (time) {
                if (this.prevDisabled && x == 0) {
                    this.goToPage(1, 0, 0);
                    return;
                }

                if (this.nextDisabled && x == -(this.scrollerWidth - this.wrapperWidth)) {
                    this.goToPage(1, 0, 0);
                    return;
                }
            }

            if (this.options.keepInCenterH && this.getScrollerWidth() * this.scale < this.wrapperWidth) {
                x = this.wrapperWidth / 2 - (this.getScrollerWidth() * this.scale) / 2;
            }

            if (this.options.keepInCenterV && this.getScrollerHeight() * this.scale < this.wrapperHeight) {
                y = this.wrapperHeight / 2 - (this.getScrollerHeight() * this.scale) / 2;
            }
            /*end custom*/

            easing = easing || utils.ease.circular;

            this.isInTransition = this.options.useTransition && time > 0;
            var transitionType = this.options.useTransition && easing.style;
            if (!time || transitionType) {
                if (transitionType) {
                    this._transitionTimingFunction(easing.style);
                    this._transitionTime(time);
                }
                this._translate(x, y);
            } else {
                this._animate(x, y, time, easing.fn);
            }
        },

        scrollToElement: function (el, time, offsetX, offsetY, easing) {
            el = el.nodeType ? el : this.scroller.querySelector(el);

            if (!el) {
                return;
            }

            var pos = utils.offset(el);

            pos.left -= this.wrapperOffset.left;
            pos.top -= this.wrapperOffset.top;

            // if offsetX/Y are true we center the element to the screen
            var elRect = utils.getRect(el);
            var wrapperRect = utils.getRect(this.wrapper);
            if (offsetX === true) {
                offsetX = Math.round(elRect.width / 2 - wrapperRect.width / 2);
            }
            if (offsetY === true) {
                offsetY = Math.round(elRect.height / 2 - wrapperRect.height / 2);
            }

            pos.left -= offsetX || 0;
            pos.top -= offsetY || 0;

            pos.left = pos.left > 0 ? 0 : pos.left < this.maxScrollX ? this.maxScrollX : pos.left;
            pos.top = pos.top > 0 ? 0 : pos.top < this.maxScrollY ? this.maxScrollY : pos.top;

            time =
                time === undefined || time === null || time === 'auto'
                    ? Math.max(Math.abs(this.x - pos.left), Math.abs(this.y - pos.top))
                    : time;

            this.scrollTo(pos.left, pos.top, time, easing);
        },

        _transitionTime: function (time) {
            if (!this.options.useTransition) {
                return;
            }
            time = time || 0;
            var durationProp = utils.style.transitionDuration;
            if (!durationProp) {
                return;
            }

            this.scrollerStyle[durationProp] = time + 'ms';

            if (!time && utils.isBadAndroid) {
                this.scrollerStyle[durationProp] = '0.0001ms';
                // remove 0.0001ms
                var self = this;
                rAF(function () {
                    if (self.scrollerStyle[durationProp] === '0.0001ms') {
                        self.scrollerStyle[durationProp] = '0s';
                    }
                });
            }

            if (this.indicators) {
                for (var i = this.indicators.length; i--; ) {
                    this.indicators[i].transitionTime(time);
                }
            }

            // INSERT POINT: _transitionTime
        },

        _transitionTimingFunction: function (easing) {
            this.scrollerStyle[utils.style.transitionTimingFunction] = easing;

            if (this.indicators) {
                for (var i = this.indicators.length; i--; ) {
                    this.indicators[i].transitionTimingFunction(easing);
                }
            }

            // INSERT POINT: _transitionTimingFunction
        },

        _translate: function (x, y) {
            if (this.options.useTransform) {
                /* REPLACE START: _translate */ this.scrollerStyle[utils.style.transform] =
                    'translate(' +
                    x +
                    'px,' +
                    y +
                    'px) scale(' +
                    this.scale +
                    ') ' +
                    this.translateZ; /* REPLACE END: _translate */
            } else {
                x = Math.round(x);
                y = Math.round(y);
                this.scrollerStyle.left = x + 'px';
                this.scrollerStyle.top = y + 'px';
            }

            this.x = x;
            this.y = y;

            if (this.indicators) {
                for (var i = this.indicators.length; i--; ) {
                    this.indicators[i].updatePosition();
                }
            }

            // INSERT POINT: _translate
        },

        _initEvents: function (remove) {
            var eventType = remove ? utils.removeEvent : utils.addEvent;
            var target = this.options.bindToWrapper ? this.wrapper : window;

            eventType(window, 'orientationchange', this);
            eventType(window, 'resize', this);

            if (this.options.click) {
                eventType(this.wrapper, 'click', this, true);
            }

            if (!this.options.disableMouse) {
                eventType(this.wrapper, 'mousedown', this);
                eventType(target, 'mousemove', this);
                eventType(target, 'mousecancel', this);
                eventType(target, 'mouseup', this);
            }

            if (utils.hasPointer && !this.options.disablePointer) {
                eventType(this.wrapper, utils.prefixPointerEvent('pointerdown'), this);
                eventType(target, utils.prefixPointerEvent('pointermove'), this);
                eventType(target, utils.prefixPointerEvent('pointercancel'), this);
                eventType(target, utils.prefixPointerEvent('pointerup'), this);
            }

            if (utils.hasTouch && !this.options.disableTouch) {
                eventType(this.wrapper, 'touchstart', this);
                eventType(target, 'touchmove', this);
                eventType(target, 'touchcancel', this);
                eventType(target, 'touchend', this);
            }

            eventType(this.scroller, 'transitionend', this);
            eventType(this.scroller, 'webkitTransitionEnd', this);
            eventType(this.scroller, 'oTransitionEnd', this);
            eventType(this.scroller, 'MSTransitionEnd', this);
        },

        getComputedPosition: function () {
            var matrix = window.getComputedStyle(this.scroller, null);
            var x;
            var y;

            if (this.options.useTransform) {
                matrix = matrix[utils.style.transform].split(')')[0].split(', ');
                x = +(matrix[12] || matrix[4]);
                y = +(matrix[13] || matrix[5]);
            } else {
                x = +matrix.left.replace(/[^-\d.]/g, '');
                y = +matrix.top.replace(/[^-\d.]/g, '');
            }

            return { x: x, y: y };
        },
        _initIndicators: function () {
            var interactive = this.options.interactiveScrollbars;
            var customStyle = typeof this.options.scrollbars != 'string';
            var indicators = [];
            var indicator;

            var that = this;

            this.indicators = [];

            if (this.options.scrollbars) {
                // Vertical scrollbar
                if (this.options.scrollY) {
                    indicator = {
                        el: createDefaultScrollbar('v', interactive, this.options.scrollbars),
                        interactive: interactive,
                        defaultScrollbars: true,
                        customStyle: customStyle,
                        resize: this.options.resizeScrollbars,
                        shrink: this.options.shrinkScrollbars,
                        fade: this.options.fadeScrollbars,
                        listenX: false,
                    };

                    this.wrapper.appendChild(indicator.el);
                    indicators.push(indicator);
                }

                // Horizontal scrollbar
                if (this.options.scrollX) {
                    indicator = {
                        el: createDefaultScrollbar('h', interactive, this.options.scrollbars),
                        interactive: interactive,
                        defaultScrollbars: true,
                        customStyle: customStyle,
                        resize: this.options.resizeScrollbars,
                        shrink: this.options.shrinkScrollbars,
                        fade: this.options.fadeScrollbars,
                        listenY: false,
                    };

                    this.wrapper.appendChild(indicator.el);
                    indicators.push(indicator);
                }
            }

            if (this.options.indicators) {
                // TODO: check concat compatibility
                indicators = indicators.concat(this.options.indicators);
            }

            for (var i = indicators.length; i--; ) {
                this.indicators.push(new Indicator(this, indicators[i]));
            }

            // TODO: check if we can use array.map (wide compatibility and performance issues)
            function _indicatorsMap(fn) {
                if (that.indicators) {
                    for (var i = that.indicators.length; i--; ) {
                        fn.call(that.indicators[i]);
                    }
                }
            }

            if (this.options.fadeScrollbars) {
                this.on('scrollEnd', function () {
                    _indicatorsMap(function () {
                        this.fade();
                    });
                });

                this.on('scrollCancel', function () {
                    _indicatorsMap(function () {
                        this.fade();
                    });
                });

                this.on('scrollStart', function () {
                    _indicatorsMap(function () {
                        this.fade(1);
                    });
                });

                this.on('beforeScrollStart', function () {
                    _indicatorsMap(function () {
                        this.fade(1, true);
                    });
                });
            }

            this.on('refresh', function () {
                _indicatorsMap(function () {
                    this.refresh();
                });
            });

            this.on('destroy', function () {
                _indicatorsMap(function () {
                    this.destroy();
                });

                delete this.indicators;
            });
        },

        _initZoom: function () {
            this.scrollerStyle[utils.style.transformOrigin] = '0 0';
        },

        _zoomStart: function (e) {
            var c1 = Math.abs(e.touches[0].pageX - e.touches[1].pageX);
            var c2 = Math.abs(e.touches[0].pageY - e.touches[1].pageY);

            this.touchesDistanceStart = Math.sqrt(c1 * c1 + c2 * c2);
            this.startScale = this.scale;

            this.originX = Math.abs(e.touches[0].pageX + e.touches[1].pageX) / 2 + this.wrapperOffset.left - this.x;
            this.originY = Math.abs(e.touches[0].pageY + e.touches[1].pageY) / 2 + this.wrapperOffset.top - this.y;

            this._execEvent('zoomStart');
        },

        _zoom: function (e) {
            if (!this.enabled || utils.eventType[e.type] !== this.initiated) {
                return;
            }

            if (this.options.preventDefault) {
                e.preventDefault();
            }

            var c1 = Math.abs(e.touches[0].pageX - e.touches[1].pageX);
            var c2 = Math.abs(e.touches[0].pageY - e.touches[1].pageY);
            var distance = Math.sqrt(c1 * c1 + c2 * c2);
            var scale = (1 / this.touchesDistanceStart) * distance * this.startScale;
            var lastScale;
            var x;
            var y;

            this.scaled = true;

            if (scale < this.options.zoomMin) {
                scale = 0.5 * this.options.zoomMin * Math.pow(2.0, scale / this.options.zoomMin);
            } else if (scale > this.options.zoomMax) {
                scale = 2.0 * this.options.zoomMax * Math.pow(0.5, this.options.zoomMax / scale);
            }

            lastScale = scale / this.startScale;
            x = this.originX - this.originX * lastScale + this.startX;
            y = this.originY - this.originY * lastScale + this.startY;

            this.scale = scale;

            this.scrollTo(x, y, 0);
        },

        _zoomEnd: function (e) {
            if (!this.enabled || utils.eventType[e.type] !== this.initiated) {
                return;
            }

            if (this.options.preventDefault) {
                e.preventDefault();
            }

            var newX;
            var newY;
            var lastScale;

            this.isInTransition = 0;
            this.initiated = 0;

            if (this.scale > this.options.zoomMax) {
                this.scale = this.options.zoomMax;
            } else if (this.scale < this.options.zoomMin) {
                this.scale = this.options.zoomMin;
            }

            // Update boundaries
            this.refresh();

            lastScale = this.scale / this.startScale;

            newX = this.originX - this.originX * lastScale + this.startX;
            newY = this.originY - this.originY * lastScale + this.startY;

            if (newX > 0) {
                newX = 0;
            } else if (newX < this.maxScrollX) {
                newX = this.maxScrollX;
            }

            if (newY > 0) {
                newY = 0;
            } else if (newY < this.maxScrollY) {
                newY = this.maxScrollY;
            }

            if (this.x != newX || this.y != newY) {
                this.scrollTo(newX, newY, this.options.bounceTime);
            }

            this.scaled = false;

            this._execEvent('zoomEnd');
        },

        zoom: function (scale, x, y, time) {
            /*custom*/
            if (this.wrapperWidth == 0 || this.wrapperHeight == 0) {
                return;
            }
            /* end custom*/

            if (scale < this.options.zoomMin) {
                scale = this.options.zoomMin;
            } else if (scale > this.options.zoomMax) {
                scale = this.options.zoomMax;
            }

            if (scale == this.scale) {
                return;
            }

            var relScale = scale / this.scale;

            /*custom*/
            var that = this;
            if (relScale != 1) {
                clearTimeout(this.zoomStartTimeout);
                this.zoomStartTimeout = setTimeout(function () {
                    that._execEvent('zoomStart');
                }, 0);

                // Execute the zoomEnd event after 400ms the wheel stopped scrolling
                clearTimeout(this.wheelTimeout);
                this.wheelTimeout = setTimeout(function () {
                    that._execEvent('zoomEnd');
                }, Number(time + 100));
            }

            /*custom end*/

            x = x === undefined ? this.wrapperWidth / 2 : x;
            y = y === undefined ? this.wrapperHeight / 2 : y;
            time = time === undefined ? 300 : time;

            x = x + this.wrapperOffset.left - this.x;
            y = y + this.wrapperOffset.top - this.y;

            x = x - x * relScale + this.x;
            y = y - y * relScale + this.y;

            this.scale = scale;

            this.refresh(); // update boundaries

            if (x > 0) {
                x = 0;
            } else if (x < this.maxScrollX) {
                x = this.maxScrollX;
            }

            if (y > 0) {
                y = 0;
            } else if (y < this.maxScrollY) {
                y = this.maxScrollY;
            }

            this.scrollTo(x, y, time);
        },

        _wheelZoom: function (e) {
            var wheelDeltaY;
            var deltaScale;
            var that = this;

            /*custom - moved to function zoom()

      // Execute the zoomEnd event after 400ms the wheel stopped scrolling
      clearTimeout(this.wheelTimeout);
      this.wheelTimeout = setTimeout(function () {
        that._execEvent('zoomEnd');
      }, 400);

      custom end*/

            if ('deltaX' in e) {
                wheelDeltaY = -e.deltaY / Math.abs(e.deltaY);
            } else if ('wheelDeltaX' in e) {
                wheelDeltaY = e.wheelDeltaY / Math.abs(e.wheelDeltaY);
            } else if ('wheelDelta' in e) {
                wheelDeltaY = e.wheelDelta / Math.abs(e.wheelDelta);
            } else if ('detail' in e) {
                wheelDeltaY = -e.detail / Math.abs(e.wheelDelta);
            } else {
                return;
            }

            deltaScale = this.scale + wheelDeltaY / 5;

            this.zoom(deltaScale, e.pageX, e.pageY, 0);
        },

        _initWheel: function () {
            utils.addEvent(this.wrapper, 'wheel', this);
            utils.addEvent(this.wrapper, 'mousewheel', this);
            utils.addEvent(this.wrapper, 'DOMMouseScroll', this);

            this.on('destroy', function () {
                clearTimeout(this.wheelTimeout);
                this.wheelTimeout = null;
                utils.removeEvent(this.wrapper, 'wheel', this);
                utils.removeEvent(this.wrapper, 'mousewheel', this);
                utils.removeEvent(this.wrapper, 'DOMMouseScroll', this);
            });
        },

        _wheel: function (e) {
            if (!this.enabled) {
                return;
            }
            //custom - prevent default wheel behavior only if options.preventDefault
            if (this.options.preventDefault) {
                //custom end
                e.preventDefault();
                //custom
            }
            //custom end
            var wheelDeltaX;
            var wheelDeltaY;
            var newX;
            var newY;
            var that = this;

            if (this.wheelTimeout === undefined) {
                that._execEvent('scrollStart');
            }

            // Execute the scrollEnd event after 400ms the wheel stopped scrolling
            clearTimeout(this.wheelTimeout);

            /* custom - fixed timet 400ms changed to this.options.mouseWheelTimeout, default is 400
            this.wheelTimeout = setTimeout(function () {
                if (!that.options.snap) {
                    that._execEvent('scrollEnd');
                }
                that.wheelTimeout = undefined;
            }, 400);

			*/

            this.wheelTimeout = setTimeout(function () {
                if (!that.options.snap) {
                    that._execEvent('scrollEnd');
                }
                that.wheelTimeout = undefined;
            }, this.options.mouseWheelTimeout);

            if ('deltaX' in e) {
                if (e.deltaMode === 1) {
                    wheelDeltaX = -e.deltaX * this.options.mouseWheelSpeed;
                    wheelDeltaY = -e.deltaY * this.options.mouseWheelSpeed;
                } else {
                    wheelDeltaX = -e.deltaX;
                    wheelDeltaY = -e.deltaY;
                }
            } else if ('wheelDeltaX' in e) {
                wheelDeltaX = (e.wheelDeltaX / 120) * this.options.mouseWheelSpeed;
                wheelDeltaY = (e.wheelDeltaY / 120) * this.options.mouseWheelSpeed;
            } else if ('wheelDelta' in e) {
                wheelDeltaX = wheelDeltaY = (e.wheelDelta / 120) * this.options.mouseWheelSpeed;
            } else if ('detail' in e) {
                wheelDeltaX = wheelDeltaY = (-e.detail / 3) * this.options.mouseWheelSpeed;
            } else {
                return;
            }

            wheelDeltaX *= this.options.invertWheelDirection;
            wheelDeltaY *= this.options.invertWheelDirection;

            if (!this.hasVerticalScroll) {
                wheelDeltaX = wheelDeltaY;
                wheelDeltaY = 0;
            }

            if (this.options.snap) {
                newX = this.currentPage.pageX;
                newY = this.currentPage.pageY;

                if (wheelDeltaX > 0) {
                    newX--;
                } else if (wheelDeltaX < 0) {
                    newX++;
                }

                if (wheelDeltaY > 0) {
                    newY--;
                } else if (wheelDeltaY < 0) {
                    newY++;
                }

                this.goToPage(newX, newY);

                return;
            }

            newX = this.x + Math.round(this.hasHorizontalScroll ? wheelDeltaX : 0);
            newY = this.y + Math.round(this.hasVerticalScroll ? wheelDeltaY : 0);

            this.directionX = wheelDeltaX > 0 ? -1 : wheelDeltaX < 0 ? 1 : 0;
            this.directionY = wheelDeltaY > 0 ? -1 : wheelDeltaY < 0 ? 1 : 0;

            if (newX > 0) {
                newX = 0;
            } else if (newX < this.maxScrollX) {
                newX = this.maxScrollX;
            }

            if (newY > 0) {
                newY = 0;
            } else if (newY < this.maxScrollY) {
                newY = this.maxScrollY;
            }
            //custom - prevent page scrolling if iscroll is scrolling
            else {
                e.preventDefault();
            }
            //end custom

            this.scrollTo(newX, newY, 0);

            // INSERT POINT: _wheel
        },

        _initSnap: function () {
            this.currentPage = {};

            if (typeof this.options.snap == 'string') {
                this.options.snap = this.scroller.querySelectorAll(this.options.snap);
            }

            this.on('refresh', function () {
                var i = 0;
                var l;
                var m = 0;
                var n;
                var cx;
                var cy;
                var x = 0;
                var y;
                var stepX = this.options.snapStepX || this.wrapperWidth;
                var stepY = this.options.snapStepY || this.wrapperHeight;
                var el;
                var rect;

                this.pages = [];

                if (!this.wrapperWidth || !this.wrapperHeight || !this.scrollerWidth || !this.scrollerHeight) {
                    return;
                }

                if (this.options.snap === true) {
                    cx = Math.round(stepX / 2);
                    cy = Math.round(stepY / 2);

                    while (x > -this.scrollerWidth) {
                        this.pages[i] = [];
                        l = 0;
                        y = 0;

                        while (y > -this.scrollerHeight) {
                            this.pages[i][l] = {
                                x: Math.max(x, this.maxScrollX),
                                y: Math.max(y, this.maxScrollY),
                                width: stepX,
                                height: stepY,
                                cx: x - cx,
                                cy: y - cy,
                            };

                            y -= stepY;
                            l++;
                        }

                        x -= stepX;
                        i++;
                    }
                } else {
                    el = this.options.snap;
                    l = el.length;
                    n = -1;

                    for (; i < l; i++) {
                        rect = utils.getRect(el[i]);
                        if (i === 0 || rect.left <= utils.getRect(el[i - 1]).left) {
                            m = 0;
                            n++;
                        }

                        if (!this.pages[m]) {
                            this.pages[m] = [];
                        }

                        x = Math.max(-rect.left, this.maxScrollX);
                        y = Math.max(-rect.top, this.maxScrollY);
                        cx = x - Math.round(rect.width / 2);
                        cy = y - Math.round(rect.height / 2);

                        this.pages[m][n] = {
                            x: x,
                            y: y,
                            width: rect.width,
                            height: rect.height,
                            cx: cx,
                            cy: cy,
                        };

                        if (x > this.maxScrollX) {
                            m++;
                        }
                    }
                }

                this.goToPage(this.currentPage.pageX || 0, this.currentPage.pageY || 0, 0);

                // Update snap threshold if needed
                if (this.options.snapThreshold % 1 === 0) {
                    this.snapThresholdX = this.options.snapThreshold;
                    this.snapThresholdY = this.options.snapThreshold;
                } else {
                    this.snapThresholdX = Math.round(
                        this.pages[this.currentPage.pageX][this.currentPage.pageY].width * this.options.snapThreshold
                    );
                    this.snapThresholdY = Math.round(
                        this.pages[this.currentPage.pageX][this.currentPage.pageY].height * this.options.snapThreshold
                    );
                }
            });

            this.on('flick', function () {
                var time =
                    this.options.snapSpeed ||
                    Math.max(
                        Math.max(
                            Math.min(Math.abs(this.x - this.startX), 1000),
                            Math.min(Math.abs(this.y - this.startY), 1000)
                        ),
                        300
                    );

                this.goToPage(this.currentPage.pageX + this.directionX, this.currentPage.pageY + this.directionY, time);
            });
        },

        _nearestSnap: function (x, y) {
            if (!this.pages.length) {
                return { x: 0, y: 0, pageX: 0, pageY: 0 };
            }

            var i = 0;
            var l = this.pages.length;
            var m = 0;

            // Check if we exceeded the snap threshold
            if (
                Math.abs(x - this.absStartX) < this.snapThresholdX &&
                Math.abs(y - this.absStartY) < this.snapThresholdY
            ) {
                return this.currentPage;
            }

            if (x > 0) {
                x = 0;
            } else if (x < this.maxScrollX) {
                x = this.maxScrollX;
            }

            if (y > 0) {
                y = 0;
            } else if (y < this.maxScrollY) {
                y = this.maxScrollY;
            }

            for (; i < l; i++) {
                if (x >= this.pages[i][0].cx) {
                    x = this.pages[i][0].x;
                    break;
                }
            }

            l = this.pages[i].length;

            for (; m < l; m++) {
                if (y >= this.pages[0][m].cy) {
                    y = this.pages[0][m].y;
                    break;
                }
            }

            if (i == this.currentPage.pageX) {
                i += this.directionX;

                if (i < 0) {
                    i = 0;
                } else if (i >= this.pages.length) {
                    i = this.pages.length - 1;
                }

                x = this.pages[i][0].x;
            }

            if (m == this.currentPage.pageY) {
                m += this.directionY;

                if (m < 0) {
                    m = 0;
                } else if (m >= this.pages[0].length) {
                    m = this.pages[0].length - 1;
                }

                y = this.pages[0][m].y;
            }

            return {
                x: x,
                y: y,
                pageX: i,
                pageY: m,
            };
        },

        goToPage: function (x, y, time, easing) {
            easing = easing || this.options.bounceEasing;

            if (x >= this.pages.length) {
                x = this.pages.length - 1;
            } else if (x < 0) {
                x = 0;
            }

            if (y >= this.pages[x].length) {
                y = this.pages[x].length - 1;
            } else if (y < 0) {
                y = 0;
            }

            var posX = this.pages[x][y].x;
            var posY = this.pages[x][y].y;

            time =
                time === undefined
                    ? this.options.snapSpeed ||
                      Math.max(
                          Math.max(Math.min(Math.abs(posX - this.x), 1000), Math.min(Math.abs(posY - this.y), 1000)),
                          300
                      )
                    : time;

            this.currentPage = {
                x: posX,
                y: posY,
                pageX: x,
                pageY: y,
            };

            this.scrollTo(posX, posY, time, easing);
        },

        next: function (time, easing) {
            var x = this.currentPage.pageX;
            var y = this.currentPage.pageY;

            x++;

            if (x >= this.pages.length && this.hasVerticalScroll) {
                x = 0;
                y++;
            }

            this.goToPage(x, y, time, easing);
        },

        prev: function (time, easing) {
            var x = this.currentPage.pageX;
            var y = this.currentPage.pageY;

            x--;

            if (x < 0 && this.hasVerticalScroll) {
                x = 0;
                y--;
            }

            this.goToPage(x, y, time, easing);
        },

        _initKeys: function (e) {
            // default key bindings
            var keys = {
                pageUp: 33,
                pageDown: 34,
                end: 35,
                home: 36,
                left: 37,
                up: 38,
                right: 39,
                down: 40,
            };
            var i;

            // if you give me characters I give you keycode
            if (typeof this.options.keyBindings == 'object') {
                for (i in this.options.keyBindings) {
                    if (typeof this.options.keyBindings[i] == 'string') {
                        this.options.keyBindings[i] = this.options.keyBindings[i].toUpperCase().charCodeAt(0);
                    }
                }
            } else {
                this.options.keyBindings = {};
            }

            for (i in keys) {
                this.options.keyBindings[i] = this.options.keyBindings[i] || keys[i];
            }

            utils.addEvent(window, 'keydown', this);

            this.on('destroy', function () {
                utils.removeEvent(window, 'keydown', this);
            });
        },

        _key: function (e) {
            if (!this.enabled) {
                return;
            }

            var snap = this.options.snap; // we are using this alot, better to cache it
            var newX = snap ? this.currentPage.pageX : this.x;
            var newY = snap ? this.currentPage.pageY : this.y;
            var now = utils.getTime();
            var prevTime = this.keyTime || 0;
            var acceleration = 0.25;
            var pos;

            if (this.options.useTransition && this.isInTransition) {
                pos = this.getComputedPosition();

                this._translate(Math.round(pos.x), Math.round(pos.y));
                this.isInTransition = false;
            }

            this.keyAcceleration = now - prevTime < 200 ? Math.min(this.keyAcceleration + acceleration, 50) : 0;

            switch (e.keyCode) {
                case this.options.keyBindings.pageUp:
                    if (this.hasHorizontalScroll && !this.hasVerticalScroll) {
                        newX += snap ? 1 : this.wrapperWidth;
                    } else {
                        newY += snap ? 1 : this.wrapperHeight;
                    }
                    break;
                case this.options.keyBindings.pageDown:
                    if (this.hasHorizontalScroll && !this.hasVerticalScroll) {
                        newX -= snap ? 1 : this.wrapperWidth;
                    } else {
                        newY -= snap ? 1 : this.wrapperHeight;
                    }
                    break;
                case this.options.keyBindings.end:
                    newX = snap ? this.pages.length - 1 : this.maxScrollX;
                    newY = snap ? this.pages[0].length - 1 : this.maxScrollY;
                    break;
                case this.options.keyBindings.home:
                    newX = 0;
                    newY = 0;
                    break;
                case this.options.keyBindings.left:
                    newX += snap ? -1 : (5 + this.keyAcceleration) >> 0;
                    break;
                case this.options.keyBindings.up:
                    newY += snap ? 1 : (5 + this.keyAcceleration) >> 0;
                    break;
                case this.options.keyBindings.right:
                    newX -= snap ? -1 : (5 + this.keyAcceleration) >> 0;
                    break;
                case this.options.keyBindings.down:
                    newY -= snap ? 1 : (5 + this.keyAcceleration) >> 0;
                    break;
                default:
                    return;
            }

            if (snap) {
                this.goToPage(newX, newY);
                return;
            }

            if (newX > 0) {
                newX = 0;
                this.keyAcceleration = 0;
            } else if (newX < this.maxScrollX) {
                newX = this.maxScrollX;
                this.keyAcceleration = 0;
            }

            if (newY > 0) {
                newY = 0;
                this.keyAcceleration = 0;
            } else if (newY < this.maxScrollY) {
                newY = this.maxScrollY;
                this.keyAcceleration = 0;
            }

            this.scrollTo(newX, newY, 0);

            this.keyTime = now;
        },

        _animate: function (destX, destY, duration, easingFn) {
            var that = this;
            var startX = this.x;
            var startY = this.y;
            var startTime = utils.getTime();
            var destTime = startTime + duration;

            function step() {
                var now = utils.getTime();
                var newX;
                var newY;
                var easing;

                if (now >= destTime) {
                    that.isAnimating = false;
                    that._translate(destX, destY);

                    if (!that.resetPosition(that.options.bounceTime)) {
                        that._execEvent('scrollEnd');
                    }

                    return;
                }

                now = (now - startTime) / duration;
                easing = easingFn(now);
                newX = (destX - startX) * easing + startX;
                newY = (destY - startY) * easing + startY;
                that._translate(newX, newY);

                if (that.isAnimating) {
                    rAF(step);
                }
            }

            this.isAnimating = true;
            step();
        },
        handleEvent: function (e) {
            switch (e.type) {
                case 'touchstart':
                case 'pointerdown':
                case 'MSPointerDown':
                case 'mousedown':
                    this._start(e);

                    if (this.options.zoom && e.touches && e.touches.length > 1) {
                        this._zoomStart(e);
                    }
                    break;
                case 'touchmove':
                case 'pointermove':
                case 'MSPointerMove':
                case 'mousemove':
                    if (this.options.zoom && e.touches && e.touches[1]) {
                        this._zoom(e);
                        return;
                    }
                    this._move(e);
                    break;
                case 'touchend':
                case 'pointerup':
                case 'MSPointerUp':
                case 'mouseup':
                case 'touchcancel':
                case 'pointercancel':
                case 'MSPointerCancel':
                case 'mousecancel':
                    if (this.scaled) {
                        this._zoomEnd(e);
                        return;
                    }
                    this._end(e);
                    break;
                case 'orientationchange':
                case 'resize':
                    this._resize();
                    break;
                case 'transitionend':
                case 'webkitTransitionEnd':
                case 'oTransitionEnd':
                case 'MSTransitionEnd':
                    this._transitionEnd(e);
                    break;
                case 'wheel':
                case 'DOMMouseScroll':
                case 'mousewheel':
                    if (this.options.wheelAction == 'zoom') {
                        this._wheelZoom(e);
                        return;
                    }
                    this._wheel(e);
                    break;
                case 'keydown':
                    this._key(e);
                    break;
            }
        },
    };
    function createDefaultScrollbar(direction, interactive, type) {
        var scrollbar = document.createElement('div');
        var indicator = document.createElement('div');

        if (type === true) {
            scrollbar.style.cssText = 'position:absolute;z-index:9999';
            indicator.style.cssText =
                '-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box;position:absolute;background:rgba(0,0,0,0.5);border:1px solid rgba(255,255,255,0.9);border-radius:3px';
        }

        indicator.className = 'iScrollIndicator';

        if (direction == 'h') {
            if (type === true) {
                scrollbar.style.cssText += ';height:7px;left:2px;right:2px;bottom:0';
                indicator.style.height = '100%';
            }
            scrollbar.className = 'iScrollHorizontalScrollbar';
        } else {
            if (type === true) {
                scrollbar.style.cssText += ';width:7px;bottom:2px;top:2px;right:1px';
                indicator.style.width = '100%';
            }
            scrollbar.className = 'iScrollVerticalScrollbar';
        }

        scrollbar.style.cssText += ';overflow:hidden';

        if (!interactive) {
            scrollbar.style.pointerEvents = 'none';
        }

        scrollbar.appendChild(indicator);

        return scrollbar;
    }

    function Indicator(scroller, options) {
        this.wrapper = typeof options.el == 'string' ? document.querySelector(options.el) : options.el;
        this.wrapperStyle = this.wrapper.style;
        this.indicator = this.wrapper.children[0];
        this.indicatorStyle = this.indicator.style;
        this.scroller = scroller;

        this.options = {
            listenX: true,
            listenY: true,
            interactive: false,
            resize: true,
            defaultScrollbars: false,
            shrink: false,
            fade: false,
            speedRatioX: 0,
            speedRatioY: 0,
        };

        for (var i in options) {
            this.options[i] = options[i];
        }

        this.sizeRatioX = 1;
        this.sizeRatioY = 1;
        this.maxPosX = 0;
        this.maxPosY = 0;

        if (this.options.interactive) {
            if (!this.options.disableTouch) {
                utils.addEvent(this.indicator, 'touchstart', this);
                utils.addEvent(window, 'touchend', this);
            }
            if (!this.options.disablePointer) {
                utils.addEvent(this.indicator, utils.prefixPointerEvent('pointerdown'), this);
                utils.addEvent(window, utils.prefixPointerEvent('pointerup'), this);
            }
            if (!this.options.disableMouse) {
                utils.addEvent(this.indicator, 'mousedown', this);
                utils.addEvent(window, 'mouseup', this);
            }
        }

        if (this.options.fade) {
            this.wrapperStyle[utils.style.transform] = this.scroller.translateZ;
            var durationProp = utils.style.transitionDuration;
            if (!durationProp) {
                return;
            }
            this.wrapperStyle[durationProp] = utils.isBadAndroid ? '0.0001ms' : '0ms';
            // remove 0.0001ms
            var self = this;
            if (utils.isBadAndroid) {
                rAF(function () {
                    if (self.wrapperStyle[durationProp] === '0.0001ms') {
                        self.wrapperStyle[durationProp] = '0s';
                    }
                });
            }
            this.wrapperStyle.opacity = '0';
        }
    }

    Indicator.prototype = {
        handleEvent: function (e) {
            switch (e.type) {
                case 'touchstart':
                case 'pointerdown':
                case 'MSPointerDown':
                case 'mousedown':
                    this._start(e);
                    break;
                case 'touchmove':
                case 'pointermove':
                case 'MSPointerMove':
                case 'mousemove':
                    this._move(e);
                    break;
                case 'touchend':
                case 'pointerup':
                case 'MSPointerUp':
                case 'mouseup':
                case 'touchcancel':
                case 'pointercancel':
                case 'MSPointerCancel':
                case 'mousecancel':
                    this._end(e);
                    break;
            }
        },

        destroy: function () {
            if (this.options.fadeScrollbars) {
                clearTimeout(this.fadeTimeout);
                this.fadeTimeout = null;
            }
            if (this.options.interactive) {
                utils.removeEvent(this.indicator, 'touchstart', this);
                utils.removeEvent(this.indicator, utils.prefixPointerEvent('pointerdown'), this);
                utils.removeEvent(this.indicator, 'mousedown', this);

                utils.removeEvent(window, 'touchmove', this);
                utils.removeEvent(window, utils.prefixPointerEvent('pointermove'), this);
                utils.removeEvent(window, 'mousemove', this);

                utils.removeEvent(window, 'touchend', this);
                utils.removeEvent(window, utils.prefixPointerEvent('pointerup'), this);
                utils.removeEvent(window, 'mouseup', this);
            }

            if (this.options.defaultScrollbars && this.wrapper.parentNode) {
                this.wrapper.parentNode.removeChild(this.wrapper);
            }
        },

        _start: function (e) {
            var point = e.touches ? e.touches[0] : e;

            e.preventDefault();
            e.stopPropagation();

            this.transitionTime();

            this.initiated = true;
            this.moved = false;
            this.lastPointX = point.pageX;
            this.lastPointY = point.pageY;

            this.startTime = utils.getTime();

            if (!this.options.disableTouch) {
                utils.addEvent(window, 'touchmove', this);
            }
            if (!this.options.disablePointer) {
                utils.addEvent(window, utils.prefixPointerEvent('pointermove'), this);
            }
            if (!this.options.disableMouse) {
                utils.addEvent(window, 'mousemove', this);
            }

            this.scroller._execEvent('beforeScrollStart');
        },

        _move: function (e) {
            var point = e.touches ? e.touches[0] : e;
            var deltaX;
            var deltaY;
            var newX;
            var newY;
            var timestamp = utils.getTime();

            if (!this.moved) {
                this.scroller._execEvent('scrollStart');
            }

            this.moved = true;

            deltaX = point.pageX - this.lastPointX;
            this.lastPointX = point.pageX;

            deltaY = point.pageY - this.lastPointY;
            this.lastPointY = point.pageY;

            newX = this.x + deltaX;
            newY = this.y + deltaY;

            this._pos(newX, newY);

            // INSERT POINT: indicator._move

            e.preventDefault();
            e.stopPropagation();
        },

        _end: function (e) {
            if (!this.initiated) {
                return;
            }

            this.initiated = false;

            e.preventDefault();
            e.stopPropagation();

            utils.removeEvent(window, 'touchmove', this);
            utils.removeEvent(window, utils.prefixPointerEvent('pointermove'), this);
            utils.removeEvent(window, 'mousemove', this);

            if (this.scroller.options.snap) {
                var snap = this.scroller._nearestSnap(this.scroller.x, this.scroller.y);

                var time =
                    this.options.snapSpeed ||
                    Math.max(
                        Math.max(
                            Math.min(Math.abs(this.scroller.x - snap.x), 1000),
                            Math.min(Math.abs(this.scroller.y - snap.y), 1000)
                        ),
                        300
                    );

                if (this.scroller.x != snap.x || this.scroller.y != snap.y) {
                    this.scroller.directionX = 0;
                    this.scroller.directionY = 0;
                    this.scroller.currentPage = snap;
                    this.scroller.scrollTo(snap.x, snap.y, time, this.scroller.options.bounceEasing);
                }
            }

            if (this.moved) {
                this.scroller._execEvent('scrollEnd');
            }
        },

        transitionTime: function (time) {
            time = time || 0;
            var durationProp = utils.style.transitionDuration;
            if (!durationProp) {
                return;
            }

            this.indicatorStyle[durationProp] = time + 'ms';

            if (!time && utils.isBadAndroid) {
                this.indicatorStyle[durationProp] = '0.0001ms';
                // remove 0.0001ms
                var self = this;
                rAF(function () {
                    if (self.indicatorStyle[durationProp] === '0.0001ms') {
                        self.indicatorStyle[durationProp] = '0s';
                    }
                });
            }
        },

        transitionTimingFunction: function (easing) {
            this.indicatorStyle[utils.style.transitionTimingFunction] = easing;
        },

        refresh: function () {
            this.transitionTime();

            if (this.options.listenX && !this.options.listenY) {
                this.indicatorStyle.display = this.scroller.hasHorizontalScroll ? 'block' : 'none';
            } else if (this.options.listenY && !this.options.listenX) {
                this.indicatorStyle.display = this.scroller.hasVerticalScroll ? 'block' : 'none';
            } else {
                this.indicatorStyle.display =
                    this.scroller.hasHorizontalScroll || this.scroller.hasVerticalScroll ? 'block' : 'none';
            }

            if (this.scroller.hasHorizontalScroll && this.scroller.hasVerticalScroll) {
                utils.addClass(this.wrapper, 'iScrollBothScrollbars');
                utils.removeClass(this.wrapper, 'iScrollLoneScrollbar');

                if (this.options.defaultScrollbars && this.options.customStyle) {
                    if (this.options.listenX) {
                        this.wrapper.style.right = '8px';
                    } else {
                        this.wrapper.style.bottom = '8px';
                    }
                }
            } else {
                utils.removeClass(this.wrapper, 'iScrollBothScrollbars');
                utils.addClass(this.wrapper, 'iScrollLoneScrollbar');

                if (this.options.defaultScrollbars && this.options.customStyle) {
                    if (this.options.listenX) {
                        this.wrapper.style.right = '2px';
                    } else {
                        this.wrapper.style.bottom = '2px';
                    }
                }
            }

            utils.getRect(this.wrapper); // force refresh

            if (this.options.listenX) {
                this.wrapperWidth = this.wrapper.clientWidth;
                if (this.options.resize) {
                    this.indicatorWidth = Math.max(
                        Math.round(
                            (this.wrapperWidth * this.wrapperWidth) /
                                (this.scroller.scrollerWidth || this.wrapperWidth || 1)
                        ),
                        8
                    );
                    this.indicatorStyle.width = this.indicatorWidth + 'px';
                } else {
                    this.indicatorWidth = this.indicator.clientWidth;
                }

                this.maxPosX = this.wrapperWidth - this.indicatorWidth;

                if (this.options.shrink == 'clip') {
                    this.minBoundaryX = -this.indicatorWidth + 8;
                    this.maxBoundaryX = this.wrapperWidth - 8;
                } else {
                    this.minBoundaryX = 0;
                    this.maxBoundaryX = this.maxPosX;
                }

                this.sizeRatioX =
                    this.options.speedRatioX || (this.scroller.maxScrollX && this.maxPosX / this.scroller.maxScrollX);
            }

            if (this.options.listenY) {
                this.wrapperHeight = this.wrapper.clientHeight;
                if (this.options.resize) {
                    this.indicatorHeight = Math.max(
                        Math.round(
                            (this.wrapperHeight * this.wrapperHeight) /
                                (this.scroller.scrollerHeight || this.wrapperHeight || 1)
                        ),
                        8
                    );
                    this.indicatorStyle.height = this.indicatorHeight + 'px';
                } else {
                    this.indicatorHeight = this.indicator.clientHeight;
                }

                this.maxPosY = this.wrapperHeight - this.indicatorHeight;

                if (this.options.shrink == 'clip') {
                    this.minBoundaryY = -this.indicatorHeight + 8;
                    this.maxBoundaryY = this.wrapperHeight - 8;
                } else {
                    this.minBoundaryY = 0;
                    this.maxBoundaryY = this.maxPosY;
                }

                this.maxPosY = this.wrapperHeight - this.indicatorHeight;
                this.sizeRatioY =
                    this.options.speedRatioY || (this.scroller.maxScrollY && this.maxPosY / this.scroller.maxScrollY);
            }

            this.updatePosition();
        },

        updatePosition: function () {
            var x = (this.options.listenX && Math.round(this.sizeRatioX * this.scroller.x)) || 0;
            var y = (this.options.listenY && Math.round(this.sizeRatioY * this.scroller.y)) || 0;

            if (!this.options.ignoreBoundaries) {
                if (x < this.minBoundaryX) {
                    if (this.options.shrink == 'scale') {
                        this.width = Math.max(this.indicatorWidth + x, 8);
                        this.indicatorStyle.width = this.width + 'px';
                    }
                    x = this.minBoundaryX;
                } else if (x > this.maxBoundaryX) {
                    if (this.options.shrink == 'scale') {
                        this.width = Math.max(this.indicatorWidth - (x - this.maxPosX), 8);
                        this.indicatorStyle.width = this.width + 'px';
                        x = this.maxPosX + this.indicatorWidth - this.width;
                    } else {
                        x = this.maxBoundaryX;
                    }
                } else if (this.options.shrink == 'scale' && this.width != this.indicatorWidth) {
                    this.width = this.indicatorWidth;
                    this.indicatorStyle.width = this.width + 'px';
                }

                if (y < this.minBoundaryY) {
                    if (this.options.shrink == 'scale') {
                        this.height = Math.max(this.indicatorHeight + y * 3, 8);
                        this.indicatorStyle.height = this.height + 'px';
                    }
                    y = this.minBoundaryY;
                } else if (y > this.maxBoundaryY) {
                    if (this.options.shrink == 'scale') {
                        this.height = Math.max(this.indicatorHeight - (y - this.maxPosY) * 3, 8);
                        this.indicatorStyle.height = this.height + 'px';
                        y = this.maxPosY + this.indicatorHeight - this.height;
                    } else {
                        y = this.maxBoundaryY;
                    }
                } else if (this.options.shrink == 'scale' && this.height != this.indicatorHeight) {
                    this.height = this.indicatorHeight;
                    this.indicatorStyle.height = this.height + 'px';
                }
            }

            this.x = x;
            this.y = y;

            if (this.scroller.options.useTransform) {
                this.indicatorStyle[utils.style.transform] =
                    'translate(' + x + 'px,' + y + 'px)' + this.scroller.translateZ;
            } else {
                this.indicatorStyle.left = x + 'px';
                this.indicatorStyle.top = y + 'px';
            }
        },

        _pos: function (x, y) {
            if (x < 0) {
                x = 0;
            } else if (x > this.maxPosX) {
                x = this.maxPosX;
            }

            if (y < 0) {
                y = 0;
            } else if (y > this.maxPosY) {
                y = this.maxPosY;
            }

            x = this.options.listenX ? Math.round(x / this.sizeRatioX) : this.scroller.x;
            y = this.options.listenY ? Math.round(y / this.sizeRatioY) : this.scroller.y;

            this.scroller.scrollTo(x, y);
        },

        fade: function (val, hold) {
            if (hold && !this.visible) {
                return;
            }

            clearTimeout(this.fadeTimeout);
            this.fadeTimeout = null;

            var time = val ? 250 : 500;
            var delay = val ? 0 : 300;

            val = val ? '1' : '0';

            this.wrapperStyle[utils.style.transitionDuration] = time + 'ms';

            this.fadeTimeout = setTimeout(
                function (val) {
                    this.wrapperStyle.opacity = val;
                    this.visible = +val;
                }.bind(this, val),
                delay
            );
        },
    };

    IScroll.utils = utils;

    if (typeof module != 'undefined' && module.exports) {
        module.exports = IScroll;
    } else if (typeof define == 'function' && define.amd) {
        define(function () {
            return IScroll;
        });
    } else {
        window.IScroll = IScroll;
    }

    window.FLIPBOOK = window.FLIPBOOK || {};
    window.FLIPBOOK.IScroll = IScroll;

    window.PointerEvent = undefined;

    // var oldEPD = Event.prototype.preventDefault;
    // Event.prototype.preventDefault = function() {
    //     debugger;
    //     oldEPD.call(this);
    // };
})(window, document, Math);