usg17/script/scrolloverflow.js

/*! iScroll v5.2.0 ~ (c) 2008-2016 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'],
            transform,
            i = 0,
            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,
            speed = Math.abs(distance) / time,
            destination,
            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')
    });

    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,
            top = -el.offsetTop;

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

        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,
                    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,
            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);
        }
    };

    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 = {

        resizeScrollbars: true,

        mouseWheelSpeed: 20,

        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 = {};

// INSERT POINT: DEFAULTS

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

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

IScroll.prototype = {
    version: '5.2.0',

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

        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) {
        // 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,
            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;
        }

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

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

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

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

        time = time || 0;

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

        if ( !this.hasVerticalScroll || this.y > 0 ) {
            y = 0;
        } 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;
    },

    refresh: function () {
        var rf = this.wrapper.offsetHeight;     // Force reflow

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

/* REPLACE START: refresh */

        this.scrollerWidth  = this.scroller.offsetWidth;
        this.scrollerHeight = this.scroller.offsetHeight;

        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;

        this.wrapperOffset = utils.offset(this.wrapper);

        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,
            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);
    },

    scrollTo: function (x, y, time, easing) {
        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
        if ( offsetX === true ) {
            offsetX = Math.round(el.offsetWidth / 2 - this.wrapper.offsetWidth / 2);
        }
        if ( offsetY === true ) {
            offsetY = Math.round(el.offsetHeight / 2 - this.wrapper.offsetHeight / 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)' + 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,
            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),
            x, 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,
            customStyle = typeof this.options.scrollbars != 'string',
            indicators = [],
            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;
        });
    },

    _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;
        }

        var wheelDeltaX, wheelDeltaY,
            newX, newY,
            that = this;

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

        // Execute the scrollEnd event after 400ms the wheel stopped scrolling
        clearTimeout(this.wheelTimeout);
        this.wheelTimeout = setTimeout(function () {
            if(!that.options.snap) {
                that._execEvent('scrollEnd');
            }
            that.wheelTimeout = undefined;
        }, 400);

        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;
        }

        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, l,
                m = 0, n,
                cx, cy,
                x = 0, y,
                stepX = this.options.snapStepX || this.wrapperWidth,
                stepY = this.options.snapStepY || this.wrapperHeight,
                el;

            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++ ) {
                    if ( i === 0 || el[i].offsetLeft <= el[i-1].offsetLeft ) {
                        m = 0;
                        n++;
                    }

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

                    x = Math.max(-el[i].offsetLeft, this.maxScrollX);
                    y = Math.max(-el[i].offsetTop, this.maxScrollY);
                    cx = x - Math.round(el[i].offsetWidth / 2);
                    cy = y - Math.round(el[i].offsetHeight / 2);

                    this.pages[m][n] = {
                        x: x,
                        y: y,
                        width: el[i].offsetWidth,
                        height: el[i].offsetHeight,
                        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,
            l = this.pages.length,
            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,
            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,
            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,
            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
            newX = snap ? this.currentPage.pageX : this.x,
            newY = snap ? this.currentPage.pageY : this.y,
            now = utils.getTime(),
            prevTime = this.keyTime || 0,
            acceleration = 0.250,
            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,
            startX = this.x,
            startY = this.y,
            startTime = utils.getTime(),
            destTime = startTime + duration;

        function step () {
            var now = utils.getTime(),
                newX, newY,
                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);
                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;
            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':
                this._wheel(e);
                break;
            case 'keydown':
                this._key(e);
                break;
            case 'click':
                if ( this.enabled && !e._constructed ) {
                    e.preventDefault();
                    e.stopPropagation();
                }
                break;
        }
    }
};
function createDefaultScrollbar (direction, interactive, type) {
    var scrollbar = document.createElement('div'),
        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.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,
            deltaX, deltaY,
            newX, newY,
            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';
                }
            }
        }

        var r = this.wrapper.offsetHeight;  // 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,
            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,
            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, document, Math);