/*!
 * iScroll v4.1.9 ~ Copyright (c) 2011 Matteo Spinelli, http://cubiq.org
 * Released under MIT license, http://cubiq.org/license
 */

(function() {
    var m = Math,
        vendor = (/webkit/i).test(navigator.appVersion) ? 'webkit' :
            (/firefox/i).test(navigator.userAgent) ? 'Moz' :
                'opera' in window ? 'O' : '',

        // Browser capabilities
        has3d = 'WebKitCSSMatrix' in window && 'm11' in new WebKitCSSMatrix(),
        hasTouch = 'ontouchstart' in window,
        hasTransform = vendor + 'Transform' in document.documentElement.style,
        isAndroid = (/android/gi).test(navigator.appVersion),
        isIDevice = (/iphone|ipad/gi).test(navigator.appVersion),
        isPlaybook = (/playbook/gi).test(navigator.appVersion),
        hasTransitionEnd = isIDevice || isPlaybook,
        nextFrame = (function() {
            return window.requestAnimationFrame
                || window.webkitRequestAnimationFrame
                || window.mozRequestAnimationFrame
                || window.oRequestAnimationFrame
                || window.msRequestAnimationFrame
                || function(callback) {
                return setTimeout(callback, 1);
            }
        })(),
        cancelFrame = (function () {
            return window.cancelRequestAnimationFrame
                || window.webkitCancelRequestAnimationFrame
                || window.mozCancelRequestAnimationFrame
                || window.oCancelRequestAnimationFrame
                || window.msCancelRequestAnimationFrame
                || clearTimeout
        })(),

        // Events
        RESIZE_EV = 'onorientationchange' in window ? 'orientationchange' : 'resize',
        START_EV = hasTouch ? 'touchstart' : 'mousedown',
        MOVE_EV = hasTouch ? 'touchmove' : 'mousemove',
        END_EV = hasTouch ? 'touchend' : 'mouseup',
        CANCEL_EV = hasTouch ? 'touchcancel' : 'mouseup',
        WHEEL_EV = vendor == 'Moz' ? 'DOMMouseScroll' : 'mousewheel',

        // Helpers
        trnOpen = 'translate' + (has3d ? '3d(' : '('),
        trnClose = has3d ? ',0)' : ')',

        // Constructor
        iScroll = function (el, options) {
            var that = this,
                doc = document,
                i;

            that.wrapper = typeof el == 'object' ? el : doc.getElementById(el);
            that.wrapper.style.overflow = 'hidden';
            that.scroller = that.wrapper.children[0];

            // Default options
            that.options = {
                hScroll: true,
                vScroll: true,
                bounce: true,
                bounceLock: false,
                momentum: true,
                lockDirection: true,
                useTransform: true,
                useTransition: false,
                topOffset: 0,
                checkDOMChanges: false,        // Experimental

                // Scrollbar
                hScrollbar: true,
                vScrollbar: true,
                fixedScrollbar: isAndroid,
                hideScrollbar: isIDevice,
                fadeScrollbar: isIDevice && has3d,
                scrollbarClass: '',

                // Zoom
                zoom: false,
                zoomMin: 1,
                zoomMax: 4,
                doubleTapZoom: 2,
                wheelAction: 'scroll',

                // Snap
                snap: false,
                snapThreshold: 1,

                // Events
                onRefresh: null,
                onBeforeScrollStart: function (e) {
                    e.preventDefault();
                },
                onScrollStart: null,
                onBeforeScrollMove: null,
                onScrollMove: null,
                onBeforeScrollEnd: null,
                onScrollEnd: null,
                onTouchEnd: null,
                onDestroy: null,
                onZoomStart: null,
                onZoom: null,
                onZoomEnd: null
            };

            // User defined options
            for (i in options) that.options[i] = options[i];

            // Normalize options
            that.options.useTransform = hasTransform ? that.options.useTransform : false;
            that.options.hScrollbar = that.options.hScroll && that.options.hScrollbar;
            that.options.vScrollbar = that.options.vScroll && that.options.vScrollbar;
            that.options.zoom = that.options.useTransform && that.options.zoom;
            that.options.useTransition = hasTransitionEnd && that.options.useTransition;

            // Set some default styles
            that.scroller.style[vendor + 'TransitionProperty'] = that.options.useTransform ? '-' + vendor.toLowerCase() + '-transform' : 'top left';
            that.scroller.style[vendor + 'TransitionDuration'] = '0';
            that.scroller.style[vendor + 'TransformOrigin'] = '0 0';
            if (that.options.useTransition) that.scroller.style[vendor + 'TransitionTimingFunction'] = 'cubic-bezier(0.33,0.66,0.66,1)';

            if (that.options.useTransform) that.scroller.style[vendor + 'Transform'] = trnOpen + '0,0' + trnClose;
            else that.scroller.style.cssText += ';position:absolute;top:0;left:0';

            if (that.options.useTransition) that.options.fixedScrollbar = true;

            that.refresh();

            that._bind(RESIZE_EV, window);
            that._bind(START_EV);
            if (!hasTouch) {
                that._bind('mouseout', that.wrapper);
                that._bind(WHEEL_EV);
            }

            if (that.options.checkDOMChanges) that.checkDOMTime = setInterval(function () {
                that._checkDOMChanges();
            }, 500);
        };

// Prototype
    iScroll.prototype = {
        enabled: true,
        x: 0,
        y: 0,
        steps: [],
        scale: 1,
        currPageX: 0, currPageY: 0,
        pagesX: [], pagesY: [],
        aniTime: null,
        wheelZoomCount: 0,

        handleEvent: function (e) {
            var that = this;
            switch (e.type) {
                case START_EV:
                    if (!hasTouch && e.button !== 0) return;
                    that._start(e);
                    break;
                case MOVE_EV:
                    that._move(e);
                    break;
                case END_EV:
                case CANCEL_EV:
                    that._end(e);
                    break;
                case RESIZE_EV:
                    that._resize();
                    break;
                case WHEEL_EV:
                    that._wheel(e);
                    break;
                case 'mouseout':
                    that._mouseout(e);
                    break;
                case 'webkitTransitionEnd':
                    that._transitionEnd(e);
                    break;
            }
        },

        _checkDOMChanges: function () {
            if (this.moved || this.zoomed || this.animating ||
                (this.scrollerW == this.scroller.offsetWidth * this.scale && this.scrollerH == this.scroller.offsetHeight * this.scale)) return;

            this.refresh();
        },

        _scrollbar: function (dir) {
            var that = this,
                doc = document,
                bar;

            if (!that[dir + 'Scrollbar']) {
                if (that[dir + 'ScrollbarWrapper']) {
                    if (hasTransform) that[dir + 'ScrollbarIndicator'].style[vendor + 'Transform'] = '';
                    that[dir + 'ScrollbarWrapper'].parentNode.removeChild(that[dir + 'ScrollbarWrapper']);
                    that[dir + 'ScrollbarWrapper'] = null;
                    that[dir + 'ScrollbarIndicator'] = null;
                }

                return;
            }

            if (!that[dir + 'ScrollbarWrapper']) {
                // Create the scrollbar wrapper
                bar = doc.createElement('div');

                if (that.options.scrollbarClass) bar.className = that.options.scrollbarClass + dir.toUpperCase();
                else bar.style.cssText = 'position:absolute;z-index:100;' + (dir == 'h' ? 'height:7px;bottom:1px;left:2px;right:' + (that.vScrollbar ? '7' : '2') + 'px' : 'width:7px;bottom:' + (that.hScrollbar ? '7' : '2') + 'px;top:2px;right:1px');

                bar.style.cssText += ';pointer-events:none;-' + vendor + '-transition-property:opacity;-' + vendor + '-transition-duration:' + (that.options.fadeScrollbar ? '350ms' : '0') + ';overflow:hidden;opacity:' + (that.options.hideScrollbar ? '0' : '1');

                that.wrapper.appendChild(bar);
                that[dir + 'ScrollbarWrapper'] = bar;

                // Create the scrollbar indicator
                bar = doc.createElement('div');
                if (!that.options.scrollbarClass) {
                    bar.style.cssText = 'position:absolute;z-index:100;background:rgba(0,0,0,0.5);border:1px solid rgba(255,255,255,0.9);-' + vendor + '-background-clip:padding-box;-' + vendor + '-box-sizing:border-box;' + (dir == 'h' ? 'height:100%' : 'width:100%') + ';-' + vendor + '-border-radius:3px;border-radius:3px';
                }
                bar.style.cssText += ';pointer-events:none;-' + vendor + '-transition-property:-' + vendor + '-transform;-' + vendor + '-transition-timing-function:cubic-bezier(0.33,0.66,0.66,1);-' + vendor + '-transition-duration:0;-' + vendor + '-transform:' + trnOpen + '0,0' + trnClose;
                if (that.options.useTransition) bar.style.cssText += ';-' + vendor + '-transition-timing-function:cubic-bezier(0.33,0.66,0.66,1)';

                that[dir + 'ScrollbarWrapper'].appendChild(bar);
                that[dir + 'ScrollbarIndicator'] = bar;
            }

            if (dir == 'h') {
                that.hScrollbarSize = that.hScrollbarWrapper.clientWidth;
                that.hScrollbarIndicatorSize = m.max(m.round(that.hScrollbarSize * that.hScrollbarSize / that.scrollerW), 8);
                that.hScrollbarIndicator.style.width = that.hScrollbarIndicatorSize + 'px';
                that.hScrollbarMaxScroll = that.hScrollbarSize - that.hScrollbarIndicatorSize;
                that.hScrollbarProp = that.hScrollbarMaxScroll / that.maxScrollX;
            } else {
                that.vScrollbarSize = that.vScrollbarWrapper.clientHeight;
                that.vScrollbarIndicatorSize = m.max(m.round(that.vScrollbarSize * that.vScrollbarSize / that.scrollerH), 8);
                that.vScrollbarIndicator.style.height = that.vScrollbarIndicatorSize + 'px';
                that.vScrollbarMaxScroll = that.vScrollbarSize - that.vScrollbarIndicatorSize;
                that.vScrollbarProp = that.vScrollbarMaxScroll / that.maxScrollY;
            }

            // Reset position
            that._scrollbarPos(dir, true);
        },

        _resize: function () {
            var that = this;
            setTimeout(function () {
                that.refresh();
            }, isAndroid ? 200 : 0);
        },

        _pos: function (x, y) {
            x = this.hScroll ? x : 0;
            y = this.vScroll ? y : 0;

            if (this.options.useTransform) {
                this.scroller.style[vendor + 'Transform'] = trnOpen + x + 'px,' + y + 'px' + trnClose + ' scale(' + this.scale + ')';
            } else {
                x = m.round(x);
                y = m.round(y);
                this.scroller.style.left = x + 'px';
                this.scroller.style.top = y + 'px';
            }

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

            this._scrollbarPos('h');
            this._scrollbarPos('v');
        },

        _scrollbarPos: function (dir, hidden) {
            var that = this,
                pos = dir == 'h' ? that.x : that.y,
                size;

            if (!that[dir + 'Scrollbar']) return;

            pos = that[dir + 'ScrollbarProp'] * pos;

            if (pos < 0) {
                if (!that.options.fixedScrollbar) {
                    size = that[dir + 'ScrollbarIndicatorSize'] + m.round(pos * 3);
                    if (size < 8) size = 8;
                    that[dir + 'ScrollbarIndicator'].style[dir == 'h' ? 'width' : 'height'] = size + 'px';
                }
                pos = 0;
            } else if (pos > that[dir + 'ScrollbarMaxScroll']) {
                if (!that.options.fixedScrollbar) {
                    size = that[dir + 'ScrollbarIndicatorSize'] - m.round((pos - that[dir + 'ScrollbarMaxScroll']) * 3);
                    if (size < 8) size = 8;
                    that[dir + 'ScrollbarIndicator'].style[dir == 'h' ? 'width' : 'height'] = size + 'px';
                    pos = that[dir + 'ScrollbarMaxScroll'] + (that[dir + 'ScrollbarIndicatorSize'] - size);
                } else {
                    pos = that[dir + 'ScrollbarMaxScroll'];
                }
            }

            that[dir + 'ScrollbarWrapper'].style[vendor + 'TransitionDelay'] = '0';
            that[dir + 'ScrollbarWrapper'].style.opacity = hidden && that.options.hideScrollbar ? '0' : '1';
            that[dir + 'ScrollbarIndicator'].style[vendor + 'Transform'] = trnOpen + (dir == 'h' ? pos + 'px,0' : '0,' + pos + 'px') + trnClose;
        },

        _start: function (e) {
            var that = this,
                point = hasTouch ? e.touches[0] : e,
                matrix, x, y,
                c1, c2;

            if (!that.enabled) return;

            if (that.options.onBeforeScrollStart) that.options.onBeforeScrollStart.call(that, e);

            if (that.options.useTransition || that.options.zoom) that._transitionTime(0);

            that.moved = false;
            that.animating = false;
            that.zoomed = false;
            that.distX = 0;
            that.distY = 0;
            that.absDistX = 0;
            that.absDistY = 0;
            that.dirX = 0;
            that.dirY = 0;

            // Gesture start
            if (that.options.zoom && hasTouch && e.touches.length > 1) {
                c1 = m.abs(e.touches[0].pageX - e.touches[1].pageX);
                c2 = m.abs(e.touches[0].pageY - e.touches[1].pageY);
                that.touchesDistStart = m.sqrt(c1 * c1 + c2 * c2);

                that.originX = m.abs(e.touches[0].pageX + e.touches[1].pageX - that.wrapperOffsetLeft * 2) / 2 - that.x;
                that.originY = m.abs(e.touches[0].pageY + e.touches[1].pageY - that.wrapperOffsetTop * 2) / 2 - that.y;

                if (that.options.onZoomStart) that.options.onZoomStart.call(that, e);
            }

            if (that.options.momentum) {
                if (that.options.useTransform) {
                    // Very lame general purpose alternative to CSSMatrix
                    matrix = getComputedStyle(that.scroller, null)[vendor + 'Transform'].replace(/[^0-9-.,]/g, '').split(',');
                    x = matrix[4] * 1;
                    y = matrix[5] * 1;
                } else {
                    x = getComputedStyle(that.scroller, null).left.replace(/[^0-9-]/g, '') * 1;
                    y = getComputedStyle(that.scroller, null).top.replace(/[^0-9-]/g, '') * 1;
                }

                if (x != that.x || y != that.y) {
                    if (that.options.useTransition) that._unbind('webkitTransitionEnd');
                    else cancelFrame(that.aniTime);
                    that.steps = [];
                    that._pos(x, y);
                }
            }

            that.absStartX = that.x;	// Needed by snap threshold
            that.absStartY = that.y;

            that.startX = that.x;
            that.startY = that.y;
            that.pointX = point.pageX;
            that.pointY = point.pageY;

            that.startTime = e.timeStamp || Date.now();

            if (that.options.onScrollStart) that.options.onScrollStart.call(that, e);

            that._bind(MOVE_EV);
            that._bind(END_EV);
            that._bind(CANCEL_EV);
        },

        _move: function (e) {
            var that = this,
                point = hasTouch ? e.touches[0] : e,
                deltaX = point.pageX - that.pointX,
                deltaY = point.pageY - that.pointY,
                newX = that.x + deltaX,
                newY = that.y + deltaY,
                c1, c2, scale,
                timestamp = e.timeStamp || Date.now();

            if (that.options.onBeforeScrollMove) that.options.onBeforeScrollMove.call(that, e);

            // Zoom
            if (that.options.zoom && hasTouch && e.touches.length > 1) {
                c1 = m.abs(e.touches[0].pageX - e.touches[1].pageX);
                c2 = m.abs(e.touches[0].pageY - e.touches[1].pageY);
                that.touchesDist = m.sqrt(c1 * c1 + c2 * c2);

                that.zoomed = true;

                scale = 1 / that.touchesDistStart * that.touchesDist * this.scale;

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

                that.lastScale = scale / this.scale;

                newX = this.originX - this.originX * that.lastScale + this.x,
                    newY = this.originY - this.originY * that.lastScale + this.y;

                this.scroller.style[vendor + 'Transform'] = trnOpen + newX + 'px,' + newY + 'px' + trnClose + ' scale(' + scale + ')';

                if (that.options.onZoom) that.options.onZoom.call(that, e);
                return;
            }

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

            // Slow down if outside of the boundaries
            if (newX > 0 || newX < that.maxScrollX) {
                newX = that.options.bounce ? that.x + (deltaX / 2) : newX >= 0 || that.maxScrollX >= 0 ? 0 : that.maxScrollX;
            }
            if (newY > that.minScrollY || newY < that.maxScrollY) {
                newY = that.options.bounce ? that.y + (deltaY / 2) : newY >= that.minScrollY || that.maxScrollY >= 0 ? that.minScrollY : that.maxScrollY;
            }

            if (that.absDistX < 6 && that.absDistY < 6) {
                that.distX += deltaX;
                that.distY += deltaY;
                that.absDistX = m.abs(that.distX);
                that.absDistY = m.abs(that.distY);

                return;
            }

            // Lock direction
            if (that.options.lockDirection) {
                if (that.absDistX > that.absDistY + 5) {
                    newY = that.y;
                    deltaY = 0;
                } else if (that.absDistY > that.absDistX + 5) {
                    newX = that.x;
                    deltaX = 0;
                }
            }

            that.moved = true;
            that._pos(newX, newY);
            that.dirX = deltaX > 0 ? -1 : deltaX < 0 ? 1 : 0;
            that.dirY = deltaY > 0 ? -1 : deltaY < 0 ? 1 : 0;

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

            if (that.options.onScrollMove) that.options.onScrollMove.call(that, e);
        },

        _end: function (e) {
            if (hasTouch && e.touches.length != 0) return;

            var that = this,
                point = hasTouch ? e.changedTouches[0] : e,
                target, ev,
                momentumX = { dist:0, time:0 },
                momentumY = { dist:0, time:0 },
                duration = (e.timeStamp || Date.now()) - that.startTime,
                newPosX = that.x,
                newPosY = that.y,
                distX, distY,
                newDuration,
                snap,
                scale;

            that._unbind(MOVE_EV);
            that._unbind(END_EV);
            that._unbind(CANCEL_EV);

            if (that.options.onBeforeScrollEnd) that.options.onBeforeScrollEnd.call(that, e);

            if (that.zoomed) {
                scale = that.scale * that.lastScale;
                scale = Math.max(that.options.zoomMin, scale);
                scale = Math.min(that.options.zoomMax, scale);
                that.lastScale = scale / that.scale;
                that.scale = scale;

                that.x = that.originX - that.originX * that.lastScale + that.x;
                that.y = that.originY - that.originY * that.lastScale + that.y;

                that.scroller.style[vendor + 'TransitionDuration'] = '200ms';
                that.scroller.style[vendor + 'Transform'] = trnOpen + that.x + 'px,' + that.y + 'px' + trnClose + ' scale(' + that.scale + ')';

                that.zoomed = false;
                that.refresh();

                if (that.options.onZoomEnd) that.options.onZoomEnd.call(that, e);
                return;
            }

            if (!that.moved) {
                if (hasTouch) {
                    if (that.doubleTapTimer && that.options.zoom) {
                        // Double tapped
                        clearTimeout(that.doubleTapTimer);
                        that.doubleTapTimer = null;
                        if (that.options.onZoomStart) that.options.onZoomStart.call(that, e);
                        that.zoom(that.pointX, that.pointY, that.scale == 1 ? that.options.doubleTapZoom : 1);
                        if (that.options.onZoomEnd) {
                            setTimeout(function() {
                                that.options.onZoomEnd.call(that, e);
                            }, 200); // 200 is default zoom duration
                        }
                    } else {
                        that.doubleTapTimer = setTimeout(function () {
                            that.doubleTapTimer = null;

                            // Find the last touched element
                            target = point.target;
                            while (target.nodeType != 1) target = target.parentNode;

                            if (target.tagName != 'SELECT' && target.tagName != 'INPUT' && target.tagName != 'TEXTAREA') {
                                ev = document.createEvent('MouseEvents');
                                ev.initMouseEvent('click', true, true, e.view, 1,
                                    point.screenX, point.screenY, point.clientX, point.clientY,
                                    e.ctrlKey, e.altKey, e.shiftKey, e.metaKey,
                                    0, null);
                                ev._fake = true;
                                target.dispatchEvent(ev);
                            }
                        }, that.options.zoom ? 250 : 0);
                    }
                }

                that._resetPos(200);

                if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
                return;
            }

            if (duration < 300 && that.options.momentum) {
                momentumX = newPosX ? that._momentum(newPosX - that.startX, duration, -that.x, that.scrollerW - that.wrapperW + that.x, that.options.bounce ? that.wrapperW : 0) : momentumX;
                momentumY = newPosY ? that._momentum(newPosY - that.startY, duration, -that.y, (that.maxScrollY < 0 ? that.scrollerH - that.wrapperH + that.y - that.minScrollY : 0), that.options.bounce ? that.wrapperH : 0) : momentumY;

                newPosX = that.x + momentumX.dist;
                newPosY = that.y + momentumY.dist;

                if ((that.x > 0 && newPosX > 0) || (that.x < that.maxScrollX && newPosX < that.maxScrollX)) momentumX = { dist:0, time:0 };
                if ((that.y > that.minScrollY && newPosY > that.minScrollY) || (that.y < that.maxScrollY && newPosY < that.maxScrollY)) momentumY = { dist:0, time:0 };
            }

            if (momentumX.dist || momentumY.dist) {
                newDuration = m.max(m.max(momentumX.time, momentumY.time), 10);

                // Do we need to snap?
                if (that.options.snap) {
                    distX = newPosX - that.absStartX;
                    distY = newPosY - that.absStartY;
                    if (m.abs(distX) < that.options.snapThreshold && m.abs(distY) < that.options.snapThreshold) {
                        that.scrollTo(that.absStartX, that.absStartY, 200);
                    }
                    else {
                        snap = that._snap(newPosX, newPosY);
                        newPosX = snap.x;
                        newPosY = snap.y;
                        newDuration = m.max(snap.time, newDuration);
                    }
                }

                that.scrollTo(m.round(newPosX), m.round(newPosY), newDuration);

                if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
                return;
            }

            // Do we need to snap?
            if (that.options.snap) {
                distX = newPosX - that.absStartX;
                distY = newPosY - that.absStartY;
                if (m.abs(distX) < that.options.snapThreshold && m.abs(distY) < that.options.snapThreshold) that.scrollTo(that.absStartX, that.absStartY, 200);
                else {
                    snap = that._snap(that.x, that.y);
                    if (snap.x != that.x || snap.y != that.y) that.scrollTo(snap.x, snap.y, snap.time);
                }

                if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
                return;
            }

            that._resetPos(200);
            if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
        },

        _resetPos: function (time) {
            var that = this,
                resetX = that.x >= 0 ? 0 : that.x < that.maxScrollX ? that.maxScrollX : that.x,
                resetY = that.y >= that.minScrollY || that.maxScrollY > 0 ? that.minScrollY : that.y < that.maxScrollY ? that.maxScrollY : that.y;

            if (resetX == that.x && resetY == that.y) {
                if (that.moved) {
                    that.moved = false;
                    if (that.options.onScrollEnd) that.options.onScrollEnd.call(that);		// Execute custom code on scroll end
                }

                if (that.hScrollbar && that.options.hideScrollbar) {
                    if (vendor == 'webkit') that.hScrollbarWrapper.style[vendor + 'TransitionDelay'] = '300ms';
                    that.hScrollbarWrapper.style.opacity = '0';
                }
                if (that.vScrollbar && that.options.hideScrollbar) {
                    if (vendor == 'webkit') that.vScrollbarWrapper.style[vendor + 'TransitionDelay'] = '300ms';
                    that.vScrollbarWrapper.style.opacity = '0';
                }

                return;
            }

            that.scrollTo(resetX, resetY, time || 0);
        },

        _wheel: function (e) {
            var that = this,
                wheelDeltaX, wheelDeltaY,
                deltaX, deltaY,
                deltaScale;

            if ('wheelDeltaX' in e) {
                wheelDeltaX = e.wheelDeltaX / 12;
                wheelDeltaY = e.wheelDeltaY / 12;
            } else if ('detail' in e) {
                wheelDeltaX = wheelDeltaY = -e.detail * 3;
            } else {
                wheelDeltaX = wheelDeltaY = -e.wheelDelta;
            }

            if (that.options.wheelAction == 'zoom') {
                deltaScale = that.scale * Math.pow(2, 1 / 3 * (wheelDeltaY ? wheelDeltaY / Math.abs(wheelDeltaY) : 0));
                if (deltaScale < that.options.zoomMin) deltaScale = that.options.zoomMin;
                if (deltaScale > that.options.zoomMax) deltaScale = that.options.zoomMax;

                if (deltaScale != that.scale) {
                    if (!that.wheelZoomCount && that.options.onZoomStart) that.options.onZoomStart.call(that, e);
                    that.wheelZoomCount++;

                    that.zoom(e.pageX, e.pageY, deltaScale, 400);

                    setTimeout(function() {
                        that.wheelZoomCount--;
                        if (!that.wheelZoomCount && that.options.onZoomEnd) that.options.onZoomEnd.call(that, e);
                    }, 400);
                }

                return;
            }

            deltaX = that.x + wheelDeltaX;
            deltaY = that.y + wheelDeltaY;

            if (deltaX > 0) deltaX = 0;
            else if (deltaX < that.maxScrollX) deltaX = that.maxScrollX;

            if (deltaY > that.minScrollY) deltaY = that.minScrollY;
            else if (deltaY < that.maxScrollY) deltaY = that.maxScrollY;

            that.scrollTo(deltaX, deltaY, 0);
        },

        _mouseout: function (e) {
            var t = e.relatedTarget;

            if (!t) {
                this._end(e);
                return;
            }

            while (t = t.parentNode) if (t == this.wrapper) return;

            this._end(e);
        },

        _transitionEnd: function (e) {
            var that = this;

            if (e.target != that.scroller) return;

            that._unbind('webkitTransitionEnd');

            that._startAni();
        },


        /**
         *
         * Utilities
         *
         */
        _startAni: function () {
            var that = this,
                startX = that.x, startY = that.y,
                startTime = Date.now(),
                step, easeOut;

            if (that.animating) return;

            if (!that.steps.length) {
                that._resetPos(400);
                return;
            }

            step = that.steps.shift();

            if (step.x == startX && step.y == startY) step.time = 0;

            that.animating = true;
            that.moved = true;

            if (that.options.useTransition) {
                that._transitionTime(step.time);
                that._pos(step.x, step.y);
                that.animating = false;
                if (step.time) that._bind('webkitTransitionEnd');
                else that._resetPos(0);
                return;
            }

            (function animate() {
                var now = Date.now(),
                    newX, newY;

                if (now >= startTime + step.time) {
                    that._pos(step.x, step.y);
                    that.animating = false;
                    if (that.options.onAnimationEnd) that.options.onAnimationEnd.call(that);			// Execute custom code on animation end
                    that._startAni();
                    return;
                }

                now = (now - startTime) / step.time - 1;
                easeOut = m.sqrt(1 - now * now);
                newX = (step.x - startX) * easeOut + startX;
                newY = (step.y - startY) * easeOut + startY;
                that._pos(newX, newY);
                if (that.animating) that.aniTime = nextFrame(animate);
            })();
        },

        _transitionTime: function (time) {
            time += 'ms';
            this.scroller.style[vendor + 'TransitionDuration'] = time;
            if (this.hScrollbar) this.hScrollbarIndicator.style[vendor + 'TransitionDuration'] = time;
            if (this.vScrollbar) this.vScrollbarIndicator.style[vendor + 'TransitionDuration'] = time;
        },

        _momentum: function (dist, time, maxDistUpper, maxDistLower, size) {
            var deceleration = 0.0006,
                speed = m.abs(dist) / time,
                newDist = (speed * speed) / (2 * deceleration),
                newTime = 0, outsideDist = 0;

            // Proportinally reduce speed if we are outside of the boundaries
            if (dist > 0 && newDist > maxDistUpper) {
                outsideDist = size / (6 / (newDist / speed * deceleration));
                maxDistUpper = maxDistUpper + outsideDist;
                speed = speed * maxDistUpper / newDist;
                newDist = maxDistUpper;
            } else if (dist < 0 && newDist > maxDistLower) {
                outsideDist = size / (6 / (newDist / speed * deceleration));
                maxDistLower = maxDistLower + outsideDist;
                speed = speed * maxDistLower / newDist;
                newDist = maxDistLower;
            }

            newDist = newDist * (dist < 0 ? -1 : 1);
            newTime = speed / deceleration;

            return { dist: newDist, time: m.round(newTime) };
        },

        _offset: function (el) {
            var left = -el.offsetLeft,
                top = -el.offsetTop;

            while (el = el.offsetParent) {
                left -= el.offsetLeft;
                top -= el.offsetTop;
            }

            if (el != this.wrapper) {
                left *= this.scale;
                top *= this.scale;
            }

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

        _snap: function (x, y) {
            var that = this,
                i, l,
                page, time,
                sizeX, sizeY;

            // Check page X
            page = that.pagesX.length - 1;
            for (i = 0,l = that.pagesX.length; i < l; i++) {
                if (x >= that.pagesX[i]) {
                    page = i;
                    break;
                }
            }
            if (page == that.currPageX && page > 0 && that.dirX < 0) page--;
            x = that.pagesX[page];
            sizeX = m.abs(x - that.pagesX[that.currPageX]);
            sizeX = sizeX ? m.abs(that.x - x) / sizeX * 500 : 0;
            that.currPageX = page;

            // Check page Y
            page = that.pagesY.length - 1;
            for (i = 0; i < page; i++) {
                if (y >= that.pagesY[i]) {
                    page = i;
                    break;
                }
            }
            if (page == that.currPageY && page > 0 && that.dirY < 0) page--;
            y = that.pagesY[page];
            sizeY = m.abs(y - that.pagesY[that.currPageY]);
            sizeY = sizeY ? m.abs(that.y - y) / sizeY * 500 : 0;
            that.currPageY = page;

            // Snap with constant speed (proportional duration)
            time = m.round(m.max(sizeX, sizeY)) || 200;

            return { x: x, y: y, time: time };
        },

        _bind: function (type, el, bubble) {
            (el || this.scroller).addEventListener(type, this, !!bubble);
        },

        _unbind: function (type, el, bubble) {
            (el || this.scroller).removeEventListener(type, this, !!bubble);
        },


        /**
         *
         * Public methods
         *
         */
        destroy: function () {
            var that = this;

            that.scroller.style[vendor + 'Transform'] = '';

            // Remove the scrollbars
            that.hScrollbar = false;
            that.vScrollbar = false;
            that._scrollbar('h');
            that._scrollbar('v');

            // Remove the event listeners
            that._unbind(RESIZE_EV, window);
            that._unbind(START_EV);
            that._unbind(MOVE_EV);
            that._unbind(END_EV);
            that._unbind(CANCEL_EV);

            if (that.options.hasTouch) {
                that._unbind('mouseout', that.wrapper);
                that._unbind(WHEEL_EV);
            }

            if (that.options.useTransition) that._unbind('webkitTransitionEnd');

            if (that.options.checkDOMChanges) clearInterval(that.checkDOMTime);

            if (that.options.onDestroy) that.options.onDestroy.call(that);
        },

        refresh: function () {
            var that = this,
                offset,
                i, l,
                els,
                pos = 0,
                page = 0;

            if (that.scale < that.options.zoomMin) that.scale = that.options.zoomMin;
            that.wrapperW = that.wrapper.clientWidth || 1;
            that.wrapperH = that.wrapper.clientHeight || 1;

            that.minScrollY = -that.options.topOffset || 0;
            that.scrollerW = m.round(that.scroller.offsetWidth * that.scale);
            that.scrollerH = m.round((that.scroller.offsetHeight + that.minScrollY) * that.scale);
            that.maxScrollX = that.wrapperW - that.scrollerW;
            that.maxScrollY = that.wrapperH - that.scrollerH + that.minScrollY;
            that.dirX = 0;
            that.dirY = 0;

            if (that.options.onRefresh) that.options.onRefresh.call(that);

            that.hScroll = that.options.hScroll && that.maxScrollX < 0;
            that.vScroll = that.options.vScroll && (!that.options.bounceLock && !that.hScroll || that.scrollerH > that.wrapperH);

            that.hScrollbar = that.hScroll && that.options.hScrollbar;
            that.vScrollbar = that.vScroll && that.options.vScrollbar && that.scrollerH > that.wrapperH;

            offset = that._offset(that.wrapper);
            that.wrapperOffsetLeft = -offset.left;
            that.wrapperOffsetTop = -offset.top;

            // Prepare snap
            if (typeof that.options.snap == 'string') {
                that.pagesX = [];
                that.pagesY = [];
                els = that.scroller.querySelectorAll(that.options.snap);
                for (i = 0,l = els.length; i < l; i++) {
                    pos = that._offset(els[i]);
                    pos.left += that.wrapperOffsetLeft;
                    pos.top += that.wrapperOffsetTop;
                    that.pagesX[i] = pos.left < that.maxScrollX ? that.maxScrollX : pos.left * that.scale;
                    that.pagesY[i] = pos.top < that.maxScrollY ? that.maxScrollY : pos.top * that.scale;
                }
            } else if (that.options.snap) {
                that.pagesX = [];
                while (pos >= that.maxScrollX) {
                    that.pagesX[page] = pos;
                    pos = pos - that.wrapperW;
                    page++;
                }
                if (that.maxScrollX % that.wrapperW) that.pagesX[that.pagesX.length] = that.maxScrollX - that.pagesX[that.pagesX.length - 1] + that.pagesX[that.pagesX.length - 1];

                pos = 0;
                page = 0;
                that.pagesY = [];
                while (pos >= that.maxScrollY) {
                    that.pagesY[page] = pos;
                    pos = pos - that.wrapperH;
                    page++;
                }
                if (that.maxScrollY % that.wrapperH) that.pagesY[that.pagesY.length] = that.maxScrollY - that.pagesY[that.pagesY.length - 1] + that.pagesY[that.pagesY.length - 1];
            }

            // Prepare the scrollbars
            that._scrollbar('h');
            that._scrollbar('v');

            if (!that.zoomed) {
                that.scroller.style[vendor + 'TransitionDuration'] = '0';
                that._resetPos(200);
            }
        },

        scrollTo: function (x, y, time, relative) {
            var that = this,
                step = x,
                i, l;

            that.stop();

            if (!step.length) step = [
                { x: x, y: y, time: time, relative: relative }
            ];

            for (i = 0,l = step.length; i < l; i++) {
                if (step[i].relative) {
                    step[i].x = that.x - step[i].x;
                    step[i].y = that.y - step[i].y;
                }
                that.steps.push({ x: step[i].x, y: step[i].y, time: step[i].time || 0 });
            }

            that._startAni();
        },

        scrollToElement: function (el, time) {
            var that = this, pos;
            el = el.nodeType ? el : that.scroller.querySelector(el);
            if (!el) return;

            pos = that._offset(el);
            pos.left += that.wrapperOffsetLeft;
            pos.top += that.wrapperOffsetTop;

            pos.left = pos.left > 0 ? 0 : pos.left < that.maxScrollX ? that.maxScrollX : pos.left;
            pos.top = pos.top > that.minScrollY ? that.minScrollY : pos.top < that.maxScrollY ? that.maxScrollY : pos.top;
            time = time === undefined ? m.max(m.abs(pos.left) * 2, m.abs(pos.top) * 2) : time;

            that.scrollTo(pos.left, pos.top, time);
        },

        scrollToPage: function (pageX, pageY, time) {
            var that = this, x, y;

            if (that.options.onScrollStart) that.options.onScrollStart.call(that);

            if (that.options.snap) {
                pageX = pageX == 'next' ? that.currPageX + 1 : pageX == 'prev' ? that.currPageX - 1 : pageX;
                pageY = pageY == 'next' ? that.currPageY + 1 : pageY == 'prev' ? that.currPageY - 1 : pageY;

                pageX = pageX < 0 ? 0 : pageX > that.pagesX.length - 1 ? that.pagesX.length - 1 : pageX;
                pageY = pageY < 0 ? 0 : pageY > that.pagesY.length - 1 ? that.pagesY.length - 1 : pageY;

                that.currPageX = pageX;
                that.currPageY = pageY;
                x = that.pagesX[pageX];
                y = that.pagesY[pageY];
            } else {
                x = -that.wrapperW * pageX;
                y = -that.wrapperH * pageY;
                if (x < that.maxScrollX) x = that.maxScrollX;
                if (y < that.maxScrollY) y = that.maxScrollY;
            }

            that.scrollTo(x, y, time || 400);
        },

        disable: function () {
            this.stop();
            this._resetPos(0);
            this.enabled = false;

            // If disabled after touchstart we make sure that there are no left over events
            this._unbind(MOVE_EV);
            this._unbind(END_EV);
            this._unbind(CANCEL_EV);
        },

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

        stop: function () {
            if (this.options.useTransition) this._unbind('webkitTransitionEnd');
            else cancelFrame(this.aniTime);
            this.steps = [];
            this.moved = false;
            this.animating = false;
        },

        zoom: function (x, y, scale, time) {
            var that = this,
                relScale = scale / that.scale;

            if (!that.options.useTransform) return;

            that.zoomed = true;
            time = time === undefined ? 200 : time;
            x = x - that.wrapperOffsetLeft - that.x;
            y = y - that.wrapperOffsetTop - that.y;
            that.x = x - x * relScale + that.x;
            that.y = y - y * relScale + that.y;

            that.scale = scale;
            that.refresh();

            that.x = that.x > 0 ? 0 : that.x < that.maxScrollX ? that.maxScrollX : that.x;
            that.y = that.y > that.minScrollY ? that.minScrollY : that.y < that.maxScrollY ? that.maxScrollY : that.y;

            that.scroller.style[vendor + 'TransitionDuration'] = time + 'ms';
            that.scroller.style[vendor + 'Transform'] = trnOpen + that.x + 'px,' + that.y + 'px' + trnClose + ' scale(' + scale + ')';
            that.zoomed = false;
        },

        isReady: function () {
            return !this.moved && !this.zoomed && !this.animating;
        }
    };

    if (typeof exports !== 'undefined') exports.iScroll = iScroll;
    else window.iScroll = iScroll;

})();