(function(window, undefined) {
  'use strict';

var VENDOR_PREFIXES = ['', 'webkit', 'moz', 'MS', 'ms', 'o'];

var TYPE_FUNCTION = 'function';
var TYPE_UNDEFINED = 'undefined';

var round = Math.round;
var now = Date.now;

/**
 * set a timeout with a given scope
 * @param {Function} fn
 * @param {Number} timeout
 * @param {Object} context
 * @returns {number}
 */
function setTimeoutScope(fn, timeout, context) {
    return setTimeout(bindFn(fn, context), timeout);
}

/**
 * if the argument is an array, we want to execute the fn on each entry
 * if it aint an array we don't want to do a thing.
 * this is used by all the methods that accept a single and array argument.
 * @param {*|Array} arg
 * @param {String} fn
 * @param {Object} [context]
 * @returns {Boolean}
 */
function invokeArrayArg(arg, fn, context) {
    if (Array.isArray(arg)) {
        each(arg, context[fn], context);
        return true;
    }
    return false;
}

/**
 * walk objects and arrays
 * @param {Object} obj
 * @param {Function} iterator
 * @param {Object} context
 */
function each(obj, iterator, context) {
    var i, len;

    if (!obj) {
        return;
    }

    if (obj.forEach) {
        obj.forEach(iterator, context);
    } else if (obj.length !== undefined) {
        for (i = 0, len = obj.length; i < len; i++) {
            iterator.call(context, obj[i], i, obj);
        }
    } else {
        for (i in obj) {
            obj.hasOwnProperty(i) && iterator.call(context, obj[i], i, obj);
        }
    }
}

/**
 * extend object.
 * means that properties in dest will be overwritten by the ones in src.
 * @param {Object} dest
 * @param {Object} src
 * @param {Boolean} [merge]
 * @returns {Object} dest
 */
function extend(dest, src, merge) {
    var keys = Object.keys(src);
    for (var i = 0, len = keys.length; i < len; i++) {
        if (!merge || (merge && dest[keys[i]] === undefined)) {
            dest[keys[i]] = src[keys[i]];
        }
    }
    return dest;
}

/**
 * merge the values from src in the dest.
 * means that properties that exist in dest will not be overwritten by src
 * @param {Object} dest
 * @param {Object} src
 * @returns {Object} dest
 */
function merge(dest, src) {
    return extend(dest, src, true);
}

/**
 * simple class inheritance
 * @param {Function} child
 * @param {Function} base
 * @param {Object} [properties]
 */
function inherit(child, base, properties) {
    var baseP = base.prototype,
        childP;

    // object create is supported since IE9
    if (Object.create) {
        childP = child.prototype = Object.create(baseP);
        childP.constructor = child;
    } else {
        extend(child, base);
        var Inherited = function() {
            this.constructor = child;
        };
        Inherited.prototype = baseP;
        childP = child.prototype = new Inherited();
    }

    if (properties) {
        extend(childP, properties);
    }

    childP._super = baseP;
}

/**
 * simple function bind
 * @param {Function} fn
 * @param {Object} context
 * @returns {Function}
 */
function bindFn(fn, context) {
    return function() {
        return fn.apply(context, arguments);
    };
}

/**
 * let a boolean value also be a function that must return a boolean
 * this first item in args will be used as the context
 * @param {Boolean|Function} val
 * @param {Array} [args]
 * @returns {Boolean}
 */
function boolOrFn(val, args) {
    if (typeof val == TYPE_FUNCTION) {
        return val.apply(args ? args[0] || undefined : undefined, args);
    }
    return val;
}

/**
 * use the val2 when val1 is undefined
 * @param {*} val1
 * @param {*} val2
 * @returns {*}
 */
function ifUndefined(val1, val2) {
    return (val1 === undefined) ? val2 : val1;
}

/**
 * addEventListener with multiple events at once
 * @param {HTMLElement} element
 * @param {String} types
 * @param {Function} handler
 */
function addEventListeners(element, types, handler) {
    each(splitStr(types), function(type) {
        element.addEventListener(type, handler, false);
    });
}

/**
 * removeEventListener with multiple events at once
 * @param {HTMLElement} element
 * @param {String} types
 * @param {Function} handler
 */
function removeEventListeners(element, types, handler) {
    each(splitStr(types), function(type) {
        element.removeEventListener(type, handler, false);
    });
}

/**
 * find if a node is in the given parent
 * @method hasParent
 * @param {HTMLElement} node
 * @param {HTMLElement} parent
 * @return {Boolean} found
 */
function hasParent(node, parent) {
    while (node) {
        if (node == parent) {
            return true;
        }
        node = node.parentNode;
    }
    return false;
}

/**
 * small indexOf wrapper
 * @param {String} str
 * @param {String} find
 * @returns {Boolean} found
 */
function inStr(str, find) {
    return str.indexOf(find) > -1;
}

/**
 * split string on whitespace
 * @param {String} str
 * @returns {Array} words
 */
function splitStr(str) {
    return str.trim().split(/\s+/g);
}

/**
 * find if a array contains the object using indexOf or a simple polyFill
 * @param {Array} src
 * @param {String} find
 * @param {String} [findByKey]
 * @return {Boolean|Number} false when not found, or the index
 */
function inArray(src, find, findByKey) {
    if (src.indexOf && !findByKey) {
        return src.indexOf(find);
    } else {
        for (var i = 0, len = src.length; i < len; i++) {
            if ((findByKey && src[i][findByKey] == find) || (!findByKey && src[i] === find)) {
                return i;
            }
        }
        return -1;
    }
}

/**
 * convert array-like objects to real arrays
 * @param {Object} obj
 * @returns {Array}
 */
function toArray(obj) {
    return Array.prototype.slice.call(obj, 0);
}

/**
 * unique array with objects based on a key (like 'id') or just by the array's value
 * @param {Array} src [{id:1},{id:2},{id:1}]
 * @param {String} [key]
 * @returns {Array} [{id:1},{id:2}]
 */
function uniqueArray(src, key) {
    var results = [];
    var values = [];
    for (var i = 0, len = src.length; i < len; i++) {
        var val = key ? src[i][key] : src[i];
        if (inArray(values, val) < 0) {
            results.push(src[i]);
        }
        values[i] = val;
    }
    return results;
}

/**
 * get the prefixed property
 * @param {Object} obj
 * @param {String} property
 * @returns {String|Undefined} prefixed
 */
function prefixed(obj, property) {
    var prefix, prop;
    var camelProp = property[0].toUpperCase() + property.slice(1);

    for (var i = 0, len = VENDOR_PREFIXES.length; i < len; i++) {
        prefix = VENDOR_PREFIXES[i];
        prop = (prefix) ? prefix + camelProp : property;

        if (prop in obj) {
            return prop;
        }
    }
    return undefined;
}

/**
 * get a unique id
 * @returns {number} uniqueId
 */
var _uniqueId = 1;
function uniqueId() {
    return _uniqueId++;
}

var MOBILE_REGEX = /mobile|tablet|ip(ad|hone|od)|android/i;

var SUPPORT_TOUCH = ('ontouchstart' in window);
var SUPPORT_POINTER_EVENTS = prefixed(window, 'PointerEvent') !== undefined;
var SUPPORT_ONLY_TOUCH = SUPPORT_TOUCH && MOBILE_REGEX.test(navigator.userAgent);

var INPUT_TYPE_TOUCH = 'touch';
var INPUT_TYPE_PEN = 'pen';
var INPUT_TYPE_MOUSE = 'mouse';
var INPUT_TYPE_KINECT = 'kinect';

var COMPUTE_INTERVAL = 25;

var INPUT_START = 1;
var INPUT_MOVE = 2;
var INPUT_END = 4;
var INPUT_CANCEL = 8;

var DIRECTION_NONE = 1;
var DIRECTION_LEFT = 2;
var DIRECTION_RIGHT = 4;
var DIRECTION_UP = 8;
var DIRECTION_DOWN = 16;

var DIRECTION_HORIZONTAL = DIRECTION_LEFT | DIRECTION_RIGHT;
var DIRECTION_VERTICAL = DIRECTION_UP | DIRECTION_DOWN;
var DIRECTION_ALL = DIRECTION_HORIZONTAL | DIRECTION_VERTICAL;

var PROPS_XY = ['x', 'y'];
var PROPS_CLIENT_XY = ['clientX', 'clientY'];

/**
 * create new input type manager
 * @param {Manager} manager
 * @param {Function} callback
 * @returns {Input}
 * @constructor
 */
function Input(manager, callback) {
    var self = this;
    this.manager = manager;
    this.callback = callback;

    // smaller wrapper around the handler, for the scope and the enabled state of the manager,
    // so when disabled the input events are completely bypassed.
    this.domHandler = function(ev) {
        if (boolOrFn(self.manager.options.enable, [self.manager])) {
            self.handler(ev);
        }
    };

    this.evEl && addEventListeners(this.manager.element, this.evEl, this.domHandler);
    this.evWin && addEventListeners(window, this.evWin, this.domHandler);
}

Input.prototype = {
    /**
     * should handle the inputEvent data and trigger the callback
     * @virtual
     */
    handler: function() { },

    /**
     * unbind the events
     */
    destroy: function() {
        this.elEvents && removeEventListeners(this.manager.element, this.elEvents, this.domHandler);
        this.winEvents && removeEventListeners(window, this.winEvents, this.domHandler);
    }
};

/**
 * create new input type manager
 * @param {Hammer} manager
 * @returns {Input}
 */
function createInputInstance(manager) {
    var Type;
    if (SUPPORT_POINTER_EVENTS) {
        Type = PointerEventInput;
    } else if (SUPPORT_ONLY_TOUCH) {
        Type = TouchInput;
    } else if (!SUPPORT_TOUCH) {
        Type = MouseInput;
    } else {
        Type = TouchMouseInput;
    }
    return new (Type)(manager, inputHandler);
}

/**
 * handle input events
 * @param {Manager} manager
 * @param {String} eventType
 * @param {Object} input
 */
function inputHandler(manager, eventType, input) {
    var pointersLen = input.pointers.length;
    var changedPointersLen = input.changedPointers.length;
    var isFirst = (eventType & INPUT_START && (pointersLen - changedPointersLen === 0));
    var isFinal = (eventType & (INPUT_END | INPUT_CANCEL) && (pointersLen - changedPointersLen === 0));

    input.isFirst = isFirst;
    input.isFinal = isFinal;

    if (isFirst) {
        manager.session = {};
    }
    // source event is the normalized value of the domEvents
    // like 'touchstart, mouseup, pointerdown'
    input.eventType = eventType;

    // compute scale, rotation etc
    computeInputData(manager, input);

    // emit secret event
    manager.emit('hammer.input', input);

    manager.recognize(input);
}

/**
 * extend the data with some usable properties like scale, rotate, velocity etc
 * @param {Object} manager
 * @param {Object} input
 */
function computeInputData(manager, input) {
    var session = manager.session;
    var pointers = input.pointers;
    var pointersLength = pointers.length;

    // store the first input to calculate the distance and direction
    if (!session.firstInput) {
        session.firstInput = simpleCloneInputData(input);
    }

    // to compute scale and rotation we need to store the multiple touches
    if (pointersLength > 1 && !session.firstMultiple) {
        session.firstMultiple = simpleCloneInputData(input);
    } else if (pointersLength === 1) {
        session.firstMultiple = false;
    }

    var firstInput = session.firstInput;
    var firstMultiple = session.firstMultiple;
    var offsetCenter = firstMultiple ? firstMultiple.center : firstInput.center;
    var center = getCenter(pointers);

    input.timeStamp = now();
    input.deltaTime = input.timeStamp - firstInput.timeStamp;
    input.deltaX = center.x - offsetCenter.x;
    input.deltaY = center.y - offsetCenter.y;

    input.center = center;
    input.angle = getAngle(offsetCenter, center);
    input.distance = getDistance(offsetCenter, center);
    input.offsetDirection = getDirection(input.deltaX, input.deltaY);

    input.scale = firstMultiple ? getScale(firstMultiple.pointers, pointers) : 1;
    input.rotation = firstMultiple ? getRotation(firstMultiple.pointers, pointers) : 0;

    // find the correct target
    var target = manager.element;
    if (hasParent(input.srcEvent.target, target)) {
        target = input.srcEvent.target;
    }
    input.target = target;

    computeIntervalInputData(session, input);
}

/**
 * velocity is calculated every x ms
 * @param {Object} session
 * @param {Object} input
 */
function computeIntervalInputData(session, input) {
    var last = session.lastInterval;
    if (!last) {
        last = session.lastInterval = simpleCloneInputData(input);
    }

    var deltaTime = input.timeStamp - last.timeStamp,
        velocity,
        velocityX,
        velocityY,
        direction;

    if (deltaTime > COMPUTE_INTERVAL || last.velocity === undefined) {
        var deltaX = last.deltaX - input.deltaX;
        var deltaY = last.deltaY - input.deltaY;

        var v = getVelocity(deltaTime, deltaX, deltaY);
        velocityX = v.x;
        velocityY = v.y;
        velocity = Math.max(v.x, v.y);
        direction = getDirection(deltaX, deltaY);
    } else {
        // use latest velocity info if it doesn't overtake a minimum period
        velocity = last.velocity;
        velocityX = last.velocityX;
        velocityY = last.velocityY;
        direction = last.direction;
    }

    input.velocity = velocity;
    input.velocityX = velocityX;
    input.velocityY = velocityY;
    input.direction = direction;
}

/**
 * create a simple clone from the input used for storage of firstInput and firstMultiple
 * @param {Object} input
 * @returns {Object} clonedInputData
 */
function simpleCloneInputData(input) {
    // make a simple copy of the pointers because we will get a reference if we don't
    // we only need clientXY for the calculations
    var pointers = [];
    for (var i = 0; i < input.pointers.length; i++) {
        pointers[i] = {
            clientX: round(input.pointers[i].clientX),
            clientY: round(input.pointers[i].clientY)
        };
    }

    return {
        timeStamp: now(),
        pointers: pointers,
        center: getCenter(pointers),
        deltaX: input.deltaX,
        deltaY: input.deltaY
    };
}

/**
 * get the center of all the pointers
 * @param {Array} pointers
 * @return {Object} center contains `x` and `y` properties
 */
function getCenter(pointers) {
    var pointersLength = pointers.length;

    // no need to loop when only one touch
    if (pointersLength === 1) {
        return {
            x: round(pointers[0].clientX),
            y: round(pointers[0].clientY)
        };
    }

    var x = 0, y = 0;
    for (var i = 0; i < pointersLength; i++) {
        x += pointers[i].clientX;
        y += pointers[i].clientY;
    }

    return {
        x: round(x / pointersLength),
        y: round(y / pointersLength)
    };
}

/**
 * calculate the velocity between two points. unit is in px per ms.
 * @param {Number} deltaTime
 * @param {Number} x
 * @param {Number} y
 * @return {Object} velocity `x` and `y`
 */
function getVelocity(deltaTime, x, y) {
    return {
        x: Math.abs(x / deltaTime) || 0,
        y: Math.abs(y / deltaTime) || 0
    };
}

/**
 * get the direction between two points
 * @param {Number} x
 * @param {Number} y
 * @return {Number} direction
 */
function getDirection(x, y) {
    if (x === y) {
        return DIRECTION_NONE;
    }

    if (Math.abs(x) >= Math.abs(y)) {
        return x > 0 ? DIRECTION_LEFT : DIRECTION_RIGHT;
    }
    return y > 0 ? DIRECTION_UP : DIRECTION_DOWN;
}

/**
 * calculate the absolute distance between two points
 * @param {Object} p1 {x, y}
 * @param {Object} p2 {x, y}
 * @param {Array} [props] containing x and y keys
 * @return {Number} distance
 */
function getDistance(p1, p2, props) {
    if (!props) {
        props = PROPS_XY;
    }
    var x = p2[props[0]] - p1[props[0]],
        y = p2[props[1]] - p1[props[1]];

    return Math.sqrt((x * x) + (y * y));
}

/**
 * calculate the angle between two coordinates
 * @param {Object} p1
 * @param {Object} p2
 * @param {Array} [props] containing x and y keys
 * @return {Number} angle
 */
function getAngle(p1, p2, props) {
    if (!props) {
        props = PROPS_XY;
    }
    var x = p2[props[0]] - p1[props[0]],
        y = p2[props[1]] - p1[props[1]];
    return Math.atan2(y, x) * 180 / Math.PI;
}

/**
 * calculate the rotation degrees between two pointersets
 * @param {Array} start array of pointers
 * @param {Array} end array of pointers
 * @return {Number} rotation
 */
function getRotation(start, end) {
    return getAngle(end[1], end[0], PROPS_CLIENT_XY) - getAngle(start[1], start[0], PROPS_CLIENT_XY);
}

/**
 * calculate the scale factor between two pointersets
 * no scale is 1, and goes down to 0 when pinched together, and bigger when pinched out
 * @param {Array} start array of pointers
 * @param {Array} end array of pointers
 * @return {Number} scale
 */
function getScale(start, end) {
    return getDistance(end[0], end[1], PROPS_CLIENT_XY) / getDistance(start[0], start[1], PROPS_CLIENT_XY);
}

var MOUSE_INPUT_MAP = {
    mousedown: INPUT_START,
    mousemove: INPUT_MOVE,
    mouseup: INPUT_END,
    mouseout: INPUT_CANCEL
};

var MOUSE_ELEMENT_EVENTS = 'mousedown';
var MOUSE_WINDOW_EVENTS = 'mousemove mouseout mouseup';

/**
 * Mouse events input
 * @constructor
 * @extends Input
 */
function MouseInput() {
    this.evEl = MOUSE_ELEMENT_EVENTS;
    this.evWin = MOUSE_WINDOW_EVENTS;

    this.allow = true; // used by Input.TouchMouse to disable mouse events
    this.pressed = false; // mousedown state

    Input.apply(this, arguments);
}

inherit(MouseInput, Input, {
    /**
     * handle mouse events
     * @param {Object} ev
     */
    handler: function(ev) {
        var eventType = MOUSE_INPUT_MAP[ev.type];

        // on start we want to have the left mouse button down
        if (eventType & INPUT_START && ev.button === 0) {
            this.pressed = true;
        }

        if (eventType & INPUT_MOVE && ev.which !== 1) {
            eventType = INPUT_END;
        }

        // mouse must be down, and mouse events are allowed (see the TouchMouse input)
        if (!this.pressed || !this.allow) {
            return;
        }

        // out of the window?
        var target = ev.relatedTarget || ev.toElement || ev.target;
        if (ev.type == 'mouseout' && target.nodeName != 'HTML') {
            eventType = INPUT_MOVE;
        }

        if (eventType & (INPUT_END | INPUT_CANCEL)) {
            this.pressed = false;
        }

        this.callback(this.manager, eventType, {
            pointers: [ev],
            changedPointers: [ev],
            pointerType: INPUT_TYPE_MOUSE,
            srcEvent: ev
        });
    },
});

var POINTER_INPUT_MAP = {
    pointerdown: INPUT_START,
    pointermove: INPUT_MOVE,
    pointerup: INPUT_END,
    pointercancel: INPUT_CANCEL,
    pointerout: INPUT_CANCEL
};

// in IE10 the pointer types is defined as an enum
var IE10_POINTER_TYPE_ENUM = {
    2: INPUT_TYPE_TOUCH,
    3: INPUT_TYPE_PEN,
    4: INPUT_TYPE_MOUSE,
    5: INPUT_TYPE_KINECT // see https://twitter.com/jacobrossi/status/480596438489890816
};

var POINTER_ELEMENT_EVENTS = 'pointerdown';
var POINTER_WINDOW_EVENTS = 'pointermove pointerout pointerup pointercancel';

// IE10 has prefixed support, and case-sensitive
if (window.MSPointerEvent) {
    POINTER_ELEMENT_EVENTS = 'MSPointerDown';
    POINTER_WINDOW_EVENTS = 'MSPointerMove MSPointerOut MSPointerUp MSPointerCancel';
}

/**
 * Pointer events input
 * @constructor
 * @extends Input
 */
function PointerEventInput() {
    this.evEl = POINTER_ELEMENT_EVENTS;
    this.evWin = POINTER_WINDOW_EVENTS;

    Input.apply(this, arguments);

    this.store = (this.manager.session.pointerEvents = []);
}

inherit(PointerEventInput, Input, {
    /**
     * handle mouse events
     * @param {Object} ev
     */
    handler: function(ev) {
        var store = this.store;
        var removePointer = false;

        var eventTypeNormalized = ev.type.toLowerCase().replace('ms', '');
        var eventType = POINTER_INPUT_MAP[eventTypeNormalized];
        var pointerType = IE10_POINTER_TYPE_ENUM[ev.pointerType] || ev.pointerType;

        // out of the window?
        var target = ev.relatedTarget || ev.toElement || ev.target;
        if (eventTypeNormalized == 'pointerout' && target.nodeName != 'HTML') {
            eventType = INPUT_MOVE;
        }

        // start and mouse must be down
        if (eventType & INPUT_START && (ev.button === 0 || pointerType == INPUT_TYPE_TOUCH)) {
            store.push(ev);
        } else if (eventType & (INPUT_END | INPUT_CANCEL)) {
            removePointer = true;
        }

        // get index of the event in the store
        // it not found, so the pointer hasn't been down (so it's probably a hover)
        var storeIndex = inArray(store, ev.pointerId, 'pointerId');
        if (storeIndex < 0) {
            return;
        }

        // update the event in the store
        store[storeIndex] = ev;

        this.callback(this.manager, eventType, {
            pointers: store,
            changedPointers: [ev],
            pointerType: pointerType,
            srcEvent: ev
        });

        if (removePointer) {
            // remove from the store
            store.splice(storeIndex, 1);
        }
    }
});

var TOUCH_INPUT_MAP = {
    touchstart: INPUT_START,
    touchmove: INPUT_MOVE,
    touchend: INPUT_END,
    touchcancel: INPUT_CANCEL
};

var TOUCH_EVENTS = 'touchstart touchmove touchend touchcancel';

/**
 * Touch events input
 * @constructor
 * @extends Input
 */
function TouchInput() {
    this.evEl = TOUCH_EVENTS;
    this.targetIds = {};

    Input.apply(this, arguments);
}

inherit(TouchInput, Input, {
    /**
     * handle touch events
     * @param {Object} ev
     */
    handler: function(ev) {
        var touches = normalizeTouches(ev, this);
        this.callback(this.manager, TOUCH_INPUT_MAP[ev.type], {
            pointers: touches[0],
            changedPointers: touches[1],
            pointerType: INPUT_TYPE_TOUCH,
            srcEvent: ev
        });
    }
});

/**
 * make sure all browsers return the same touches
 * @param {Object} ev
 * @param {TouchInput} touchInput
 * @returns {Array} [all, changed]
 */
function normalizeTouches(ev, touchInput) {
    var i, len;

    var targetIds = touchInput.targetIds;
    var targetTouches = toArray(ev.targetTouches);
    var changedTouches = toArray(ev.changedTouches);
    var changedTargetTouches = [];

    // collect touches
    if (ev.type == 'touchstart') {
        for (i = 0, len = targetTouches.length; i < len; i++) {
            targetIds[targetTouches[i].identifier] = true;
        }
    }

    // filter changed touches to only contain touches that exist in the collected target ids
    for (i = 0, len = changedTouches.length; i < len; i++) {
        if (targetIds[changedTouches[i].identifier]) {
            changedTargetTouches.push(changedTouches[i]);
        }

        // cleanup removed touches
        if (ev.type == 'touchend'|| ev.type == 'touchcancel') {
            delete targetIds[changedTouches[i].identifier];
        }
    }

    return [
        // merge targetTouches with changedTargetTouches so it contains ALL touches, including 'end' and 'cancel'
        // also removed the duplicates
        uniqueArray(targetTouches.concat(changedTargetTouches), 'identifier'),

        // only the changed :-)
        changedTargetTouches
    ];
}

/**
 * Combined touch and mouse input
 *
 * Touch has a higher priority then mouse, and while touching no mouse events are allowed.
 * This because touch devices also emit mouse events while doing a touch.
 *
 * @constructor
 * @extends Input
 */
function TouchMouseInput() {
    Input.apply(this, arguments);

    var handler = bindFn(this.handler, this);
    this.touch = new TouchInput(this.manager, handler);
    this.mouse = new MouseInput(this.manager, handler);
}

inherit(TouchMouseInput, Input, {
    /**
     * handle mouse and touch events
     * @param {Hammer} manager
     * @param {String} inputEvent
     * @param {Object} inputData
     */
    handler: function(manager, inputEvent, inputData) {
        var isTouch = (inputData.pointerType == INPUT_TYPE_TOUCH),
            isMouse = (inputData.pointerType == INPUT_TYPE_MOUSE);

        // when we're in a touch event, so  block all upcoming mouse events
        // most mobile browser also emit mouseevents, right after touchstart
        if (isTouch) {
            this.mouse.allow = false;
        } else if (isMouse && !this.mouse.allow) {
            return;
        }

        // reset the allowMouse when we're done
        if (inputEvent & (INPUT_END | INPUT_CANCEL)) {
            this.mouse.allow = true;
        }

        this.callback(manager, inputEvent, inputData);
    },

    /**
     * remove the event listeners
     */
    destroy: function() {
        this.touch.destroy();
        this.mouse.destroy();
    }
});

var PREFIXED_TOUCH_ACTION = prefixed(document.body.style, 'touchAction');
var NATIVE_TOUCH_ACTION = PREFIXED_TOUCH_ACTION !== undefined;

// magical touchAction value
var TOUCH_ACTION_COMPUTE = 'compute';
var TOUCH_ACTION_AUTO = 'auto';
var TOUCH_ACTION_MANIPULATION = 'manipulation';
var TOUCH_ACTION_NONE = 'none';
var TOUCH_ACTION_PAN_X = 'pan-x';
var TOUCH_ACTION_PAN_Y = 'pan-y';

/**
 * Touch Action
 * sets the touchAction property or uses the js alternative
 * @param {Manager} manager
 * @param {String} value
 * @constructor
 */
function TouchAction(manager, value) {
    this.manager = manager;
    this.set(value);
}

TouchAction.prototype = {
    /**
     * set the touchAction value on the element or enable the polyfill
     * @param {String} value
     */
    set: function(value) {
        // find out the touch-action by the event handlers
        if (value == TOUCH_ACTION_COMPUTE) {
            value = this.compute();
        }

        if (NATIVE_TOUCH_ACTION) {
            this.manager.element.style[PREFIXED_TOUCH_ACTION] = value;
        }
        this.actions = value.toLowerCase().trim();
    },

    /**
     * just re-set the touchAction value
     */
    update: function() {
        this.set(this.manager.options.touchAction);
    },

    /**
     * compute the value for the touchAction property based on the recognizer's settings
     * @returns {String} value
     */
    compute: function() {
        var actions = [];
        each(this.manager.recognizers, function(recognizer) {
            if (boolOrFn(recognizer.options.enable, [recognizer])) {
                actions = actions.concat(recognizer.getTouchAction());
            }
        });
        return cleanTouchActions(actions.join(' '));
    },

    /**
     * this method is called on each input cycle and provides the preventing of the browser behavior
     * @param {Object} input
     */
    preventDefaults: function(input) {
        // not needed with native support for the touchAction property
        if (NATIVE_TOUCH_ACTION) {
            return;
        }

        var srcEvent = input.srcEvent;
        var direction = input.offsetDirection;

        // if the touch action did prevented once this session
        if (this.manager.session.prevented) {
            srcEvent.preventDefault();
            return;
        }

        var actions = this.actions;
        var hasNone = inStr(actions, TOUCH_ACTION_NONE);
        var hasPanY = inStr(actions, TOUCH_ACTION_PAN_Y);
        var hasPanX = inStr(actions, TOUCH_ACTION_PAN_X);

        if (hasNone || (hasPanY && hasPanX) ||
            (hasPanY && direction & DIRECTION_HORIZONTAL) ||
            (hasPanX && direction & DIRECTION_VERTICAL)) {
            return this.preventSrc(srcEvent);
        }
    },

    /**
     * call preventDefault to prevent the browser's default behavior (scrolling in most cases)
     * @param {Object} srcEvent
     */
    preventSrc: function(srcEvent) {
        this.manager.session.prevented = true;
        srcEvent.preventDefault();
    }
};

/**
 * when the touchActions are collected they are not a valid value, so we need to clean things up. *
 * @param {String} actions
 * @returns {*}
 */
function cleanTouchActions(actions) {
    // none
    if (inStr(actions, TOUCH_ACTION_NONE)) {
        return TOUCH_ACTION_NONE;
    }

    var hasPanX = inStr(actions, TOUCH_ACTION_PAN_X);
    var hasPanY = inStr(actions, TOUCH_ACTION_PAN_Y);

    // pan-x and pan-y can be combined
    if (hasPanX && hasPanY) {
        return TOUCH_ACTION_PAN_X + ' ' + TOUCH_ACTION_PAN_Y;
    }

    // pan-x OR pan-y
    if (hasPanX || hasPanY) {
        return hasPanX ? TOUCH_ACTION_PAN_X : TOUCH_ACTION_PAN_Y;
    }

    // manipulation
    if (inStr(actions, TOUCH_ACTION_MANIPULATION)) {
        return TOUCH_ACTION_MANIPULATION;
    }

    return TOUCH_ACTION_AUTO;
}

/**
 * Recognizer flow explained; *
 * All recognizers have the initial state of POSSIBLE when a input session starts.
 * The definition of a input session is from the first input until the last input, with all it's movement in it. *
 * Example session for mouse-input: mousedown -> mousemove -> mouseup
 *
 * On each recognizing cycle (see Manager.recognize) the .recognize() method is executed
 * which determines with state it should be.
 *
 * If the recognizer has the state FAILED, CANCELLED or RECOGNIZED (equals ENDED), it is reset to
 * POSSIBLE to give it another change on the next cycle.
 *
 *               Possible
 *                  |
 *            +-----+---------------+
 *            |                     |
 *      +-----+-----+               |
 *      |           |               |
 *   Failed      Cancelled          |
 *                          +-------+------+
 *                          |              |
 *                      Recognized       Began
 *                                         |
 *                                      Changed
 *                                         |
 *                                  Ended/Recognized
 */
var STATE_POSSIBLE = 1;
var STATE_BEGAN = 2;
var STATE_CHANGED = 4;
var STATE_ENDED = 8;
var STATE_RECOGNIZED = STATE_ENDED;
var STATE_CANCELLED = 16;
var STATE_FAILED = 32;

/**
 * Recognizer
 * Every recognizer needs to extend from this class.
 * @constructor
 * @param {Object} options
 */
function Recognizer(options) {
    this.id = uniqueId();

    this.manager = null;
    this.options = merge(options || {}, this.defaults);

    // default is enable true
    this.options.enable = ifUndefined(this.options.enable, true);

    this.state = STATE_POSSIBLE;

    this.simultaneous = {};
    this.requireFail = [];
}

Recognizer.prototype = {
    /**
     * @virtual
     * @type {Object}
     */
    defaults: {},

    /**
     * set options
     * @param {Object} options
     * @return {Recognizer}
     */
    set: function(options) {
        extend(this.options, options);

        // also update the touchAction, in case something changed about the directions/enabled state
        this.manager && this.manager.touchAction.update();
        return this;
    },

    /**
     * recognize simultaneous with an other recognizer.
     * @param {Recognizer} otherRecognizer
     * @returns {Recognizer} this
     */
    recognizeWith: function(otherRecognizer) {
        if (invokeArrayArg(otherRecognizer, 'recognizeWith', this)) {
            return this;
        }

        var simultaneous = this.simultaneous;
        otherRecognizer = getRecognizerByNameIfManager(otherRecognizer, this);
        if (!simultaneous[otherRecognizer.id]) {
            simultaneous[otherRecognizer.id] = otherRecognizer;
            otherRecognizer.recognizeWith(this);
        }
        return this;
    },

    /**
     * drop the simultaneous link. it doesnt remove the link on the other recognizer.
     * @param {Recognizer} otherRecognizer
     * @returns {Recognizer} this
     */
    dropRecognizeWith: function(otherRecognizer) {
        if (invokeArrayArg(otherRecognizer, 'dropRecognizeWith', this)) {
            return this;
        }

        otherRecognizer = getRecognizerByNameIfManager(otherRecognizer, this);
        delete this.simultaneous[otherRecognizer.id];
        return this;
    },

    /**
     * recognizer can only run when an other is failing
     * @param {Recognizer} otherRecognizer
     * @returns {Recognizer} this
     */
    requireFailure: function(otherRecognizer) {
        if (invokeArrayArg(otherRecognizer, 'requireFailure', this)) {
            return this;
        }

        var requireFail = this.requireFail;
        otherRecognizer = getRecognizerByNameIfManager(otherRecognizer, this);
        if (inArray(requireFail, otherRecognizer) === -1) {
            requireFail.push(otherRecognizer);
            otherRecognizer.requireFailure(this);
        }
        return this;
    },

    /**
     * drop the requireFailure link. it does not remove the link on the other recognizer.
     * @param {Recognizer} otherRecognizer
     * @returns {Recognizer} this
     */
    dropRequireFailure: function(otherRecognizer) {
        if (invokeArrayArg(otherRecognizer, 'dropRequireFailure', this)) {
            return this;
        }

        otherRecognizer = getRecognizerByNameIfManager(otherRecognizer, this);
        var index = inArray(this.requireFail, otherRecognizer);
        if (index > -1) {
            this.requireFail.splice(index, 1);
        }
        return this;
    },

    /**
     * has require failures boolean
     * @returns {boolean}
     */
    hasRequireFailures: function() {
        return this.requireFail.length > 0;
    },

    /**
     * if the recognizer can recognize simultaneous with an other recognizer
     * @param {Recognizer} otherRecognizer
     * @returns {Boolean}
     */
    canRecognizeWith: function(otherRecognizer) {
        return !!this.simultaneous[otherRecognizer.id];
    },

    /**
     * You should use `tryEmit` instead of `emit` directly to check
     * that all the needed recognizers has failed before emitting.
     * @param {Object} input
     */
    emit: function(input) {
        this.manager.emit(this.options.event, input); // simple 'eventName' events
        this.manager.emit(this.options.event + stateStr(this.state), input); // like 'panmove' and 'panstart'
    },

    /**
     * Check that all the require failure recognizers has failed,
     * if true, it emits a gesture event,
     * otherwise, setup the state to FAILED.
     * @param {Object} input
     */
    tryEmit: function(input) {
        if (this.canEmit()) {
            return this.emit(input);
        }
        // it's failing anyway
        this.state = STATE_FAILED;
    },

    /**
     * can we emit?
     * @returns {boolean}
     */
    canEmit: function() {
        for (var i = 0; i < this.requireFail.length; i++) {
            if (!(this.requireFail[i].state & (STATE_FAILED | STATE_POSSIBLE))) {
                return false;
            }
        }
        return true;
    },

    /**
     * update the recognizer
     * @param {Object} inputData
     */
    recognize: function(inputData) {
        // make a new copy of the inputData
        // so we can change the inputData without messing up the other recognizers
        var inputDataClone = extend({}, inputData);

        // is is enabled and allow recognizing?
        if (!boolOrFn(this.options.enable, [this, inputDataClone])) {
            this.reset();
            this.state = STATE_FAILED;
            return;
        }

        // reset when we've reached the end
        if (this.state & (STATE_RECOGNIZED | STATE_CANCELLED | STATE_FAILED)) {
            this.state = STATE_POSSIBLE;
        }

        this.state = this.process(inputDataClone);

        // the recognizer has recognized a gesture
        // so trigger an event
        if (this.state & (STATE_BEGAN | STATE_CHANGED | STATE_ENDED | STATE_CANCELLED)) {
            this.tryEmit(inputDataClone);
        }
    },

    /**
     * return the state of the recognizer
     * the actual recognizing happens in this method
     * @virtual
     * @param {Object} inputData
     * @returns {Const} STATE
     */
    process: function(inputData) { }, // jshint ignore:line

    /**
     * return the preferred touch-action
     * @virtual
     * @returns {Array}
     */
    getTouchAction: function() { },

    /**
     * called when the gesture isn't allowed to recognize
     * like when another is being recognized or it is disabled
     * @virtual
     */
    reset: function() { }
};

/**
 * get a usable string, used as event postfix
 * @param {Const} state
 * @returns {String} state
 */
function stateStr(state) {
    if (state & STATE_CANCELLED) {
        return 'cancel';
    } else if (state & STATE_ENDED) {
        return 'end';
    } else if (state & STATE_CHANGED) {
        return 'move';
    } else if (state & STATE_BEGAN) {
        return 'start';
    }
    return '';
}

/**
 * direction cons to string
 * @param {Const} direction
 * @returns {String}
 */
function directionStr(direction) {
    if (direction == DIRECTION_DOWN) {
        return 'down';
    } else if (direction == DIRECTION_UP) {
        return 'up';
    } else if (direction == DIRECTION_LEFT) {
        return 'left';
    } else if (direction == DIRECTION_RIGHT) {
        return 'right';
    }
    return '';
}

/**
 * get a recognizer by name if it is bound to a manager
 * @param {Recognizer|String} otherRecognizer
 * @param {Recognizer} recognizer
 * @returns {Recognizer}
 */
function getRecognizerByNameIfManager(otherRecognizer, recognizer) {
    var manager = recognizer.manager;
    if (manager) {
        return manager.get(otherRecognizer);
    }
    return otherRecognizer;
}

/**
 * This recognizer is just used as a base for the simple attribute recognizers.
 * @constructor
 * @extends Recognizer
 */
function AttrRecognizer() {
    Recognizer.apply(this, arguments);
}

inherit(AttrRecognizer, Recognizer, {
    /**
     * @namespace
     * @memberof AttrRecognizer
     */
    defaults: {
        /**
         * @type {Number}
         * @default 1
         */
        pointers: 1
    },

    /**
     * Used to check if it the recognizer receives valid input, like input.distance > 10.
     * @memberof AttrRecognizer
     * @param {Object} input
     * @returns {Boolean} recognized
     */
    attrTest: function(input) {
        var optionPointers = this.options.pointers;
        return optionPointers === 0 || input.pointers.length === optionPointers;
    },

    /**
     * Process the input and return the state for the recognizer
     * @memberof AttrRecognizer
     * @param {Object} input
     * @returns {*} State
     */
    process: function(input) {
        var state = this.state;
        var eventType = input.eventType;

        var isRecognized = state & (STATE_BEGAN | STATE_CHANGED);
        var isValid = this.attrTest(input);

        // on cancel input and we've recognized before, return STATE_CANCELLED
        if (isRecognized && (eventType & INPUT_CANCEL || !isValid)) {
            return state | STATE_CANCELLED;
        } else if (isRecognized || isValid) {
            if (eventType & INPUT_END) {
                return state | STATE_ENDED;
            } else if (!(state & STATE_BEGAN)) {
                return STATE_BEGAN;
            }
            return state | STATE_CHANGED;
        }
        return STATE_FAILED;
    }
});

/**
 * Pan
 * Recognized when the pointer is down and moved in the allowed direction.
 * @constructor
 * @extends AttrRecognizer
 */
function PanRecognizer() {
    AttrRecognizer.apply(this, arguments);

    this.pX = null;
    this.pY = null;
}

inherit(PanRecognizer, AttrRecognizer, {
    /**
     * @namespace
     * @memberof PanRecognizer
     */
    defaults: {
        event: 'pan',
        threshold: 10,
        pointers: 1,
        direction: DIRECTION_ALL
    },

    getTouchAction: function() {
        var direction = this.options.direction;

        if (direction === DIRECTION_ALL) {
            return [TOUCH_ACTION_NONE];
        }

        var actions = [];
        if (direction & DIRECTION_HORIZONTAL) {
            actions.push(TOUCH_ACTION_PAN_Y);
        }
        if (direction & DIRECTION_VERTICAL) {
            actions.push(TOUCH_ACTION_PAN_X);
        }
        return actions;
    },

    directionTest: function(input) {
        var options = this.options;
        var hasMoved = true;
        var distance = input.distance;
        var direction = input.direction;
        var x = input.deltaX;
        var y = input.deltaY;

        // lock to axis?
        if (!(direction & options.direction)) {
            if (options.direction & DIRECTION_HORIZONTAL) {
                direction = (x === 0) ? DIRECTION_NONE : (x < 0) ? DIRECTION_LEFT : DIRECTION_RIGHT;
                hasMoved = x != this.pX;
                distance = Math.abs(input.deltaX);
            } else {
                direction = (y === 0) ? DIRECTION_NONE : (y < 0) ? DIRECTION_UP : DIRECTION_DOWN;
                hasMoved = y != this.pY;
                distance = Math.abs(input.deltaY);
            }
        }
        input.direction = direction;
        return hasMoved && distance > options.threshold && direction & options.direction;
    },

    attrTest: function(input) {
        return AttrRecognizer.prototype.attrTest.call(this, input) &&
            (this.state & STATE_BEGAN || (!(this.state & STATE_BEGAN) && this.directionTest(input)));
    },

    emit: function(input) {
        this.pX = input.deltaX;
        this.pY = input.deltaY;

        this._super.emit.call(this, input);

        var direction = directionStr(input.direction);
        if (direction) {
            this.manager.emit(this.options.event + direction, input);
        }
    }
});

/**
 * Pinch
 * Recognized when two or more pointers are moving toward (zoom-in) or away from each other (zoom-out).
 * @constructor
 * @extends AttrRecognizer
 */
function PinchRecognizer() {
    AttrRecognizer.apply(this, arguments);
}

inherit(PinchRecognizer, AttrRecognizer, {
    /**
     * @namespace
     * @memberof PinchRecognizer
     */
    defaults: {
        event: 'pinch',
        threshold: 0,
        pointers: 2
    },

    getTouchAction: function() {
        return [TOUCH_ACTION_NONE];
    },

    attrTest: function(input) {
        return this._super.attrTest.call(this, input) &&
            (Math.abs(input.scale - 1) > this.options.threshold || this.state & STATE_BEGAN);
    },

    emit: function(input) {
        this._super.emit.call(this, input);
        if (input.scale !== 1) {
            var inOut = input.scale < 1 ? 'in' : 'out';
            this.manager.emit(this.options.event + inOut, input);
        }
    }
});

/**
 * Press
 * Recognized when the pointer is down for x ms without any movement.
 * @constructor
 * @extends Recognizer
 */
function PressRecognizer() {
    Recognizer.apply(this, arguments);

    this._timer = null;
    this._input = null;
}

inherit(PressRecognizer, Recognizer, {
    /**
     * @namespace
     * @memberof PressRecognizer
     */
    defaults: {
        event: 'press',
        pointers: 1,
        time: 500, // minimal time of the pointer to be pressed
        threshold: 5 // a minimal movement is ok, but keep it low
    },

    getTouchAction: function() {
        return [TOUCH_ACTION_AUTO];
    },

    process: function(input) {
        var options = this.options;

        var validPointers = input.pointers.length === options.pointers;
        var validMovement = input.distance < options.threshold;
        var validTime = input.deltaTime > options.time;

        this._input = input;

        // we only allow little movement
        // and we've reached an end event, so a tap is possible
        if (!validMovement || !validPointers || (input.eventType & (INPUT_END | INPUT_CANCEL) && !validTime)) {
            this.reset();
        } else if (input.eventType & INPUT_START) {
            this.reset();
            this._timer = setTimeoutScope(function() {
                this.state = STATE_RECOGNIZED;
                this.tryEmit();
            }, options.time, this);
        }
        return STATE_FAILED;
    },

    reset: function() {
        clearTimeout(this._timer);
    },

    emit: function() {
        if (this.state === STATE_RECOGNIZED) {
            this._input.timeStamp = now();
            this.manager.emit(this.options.event, this._input);
        }
    }
});

/**
 * Rotate
 * Recognized when two or more pointer are moving in a circular motion.
 * @constructor
 * @extends AttrRecognizer
 */
function RotateRecognizer() {
    AttrRecognizer.apply(this, arguments);
}

inherit(RotateRecognizer, AttrRecognizer, {
    /**
     * @namespace
     * @memberof RotateRecognizer
     */
    defaults: {
        event: 'rotate',
        threshold: 0,
        pointers: 2
    },

    getTouchAction: function() {
        return [TOUCH_ACTION_NONE];
    },

    attrTest: function(input) {
        return this._super.attrTest.call(this, input) &&
            (Math.abs(input.rotation) > this.options.threshold || this.state & STATE_BEGAN);
    }
});

/**
 * Swipe
 * Recognized when the pointer is moving fast (velocity), with enough distance in the allowed direction.
 * @constructor
 * @extends AttrRecognizer
 */
function SwipeRecognizer() {
    AttrRecognizer.apply(this, arguments);
}

inherit(SwipeRecognizer, AttrRecognizer, {
    /**
     * @namespace
     * @memberof SwipeRecognizer
     */
    defaults: {
        event: 'swipe',
        threshold: 10,
        velocity: 0.65,
        direction: DIRECTION_HORIZONTAL | DIRECTION_VERTICAL,
        pointers: 1
    },

    getTouchAction: function() {
        return PanRecognizer.prototype.getTouchAction.call(this);
    },

    attrTest: function(input) {
        var direction = this.options.direction;
        var velocity;

        if (direction & (DIRECTION_HORIZONTAL | DIRECTION_VERTICAL)) {
            velocity = input.velocity;
        } else if (direction & DIRECTION_HORIZONTAL) {
            velocity = input.velocityX;
        } else if (direction & DIRECTION_VERTICAL) {
            velocity = input.velocityY;
        }

        return this._super.attrTest.call(this, input) &&
            direction & input.direction &&
            velocity > this.options.velocity && input.eventType & INPUT_END;
    },

    emit: function(input) {
        this.manager.emit(this.options.event, input);

        var direction = directionStr(input.direction);
        if (direction) {
            this.manager.emit(this.options.event + direction, input);
        }
    }
});

/**
 * A tap is ecognized when the pointer is doing a small tap/click. Multiple taps are recognized if they occur
 * between the given interval and position. The delay option can be used to recognize multi-taps without firing
 * a single tap.
 *
 * The eventData from the emitted event contains the property `tapCount`, which contains the amount of
 * multi-taps being recognized.
 * @constructor
 * @extends Recognizer
 */
function TapRecognizer() {
    Recognizer.apply(this, arguments);

    // previous time and center,
    // used for tap counting
    this.pTime = false;
    this.pCenter = false;

    this._timer = null;
    this._input = null;
    this.count = 0;
}

inherit(TapRecognizer, Recognizer, {
    /**
     * @namespace
     * @memberof PinchRecognizer
     */
    defaults: {
        event: 'tap',
        pointers: 1,
        taps: 1,
        interval: 300, // max time between the multi-tap taps
        time: 250, // max time of the pointer to be down (like finger on the screen)
        threshold: 2, // a minimal movement is ok, but keep it low
        posThreshold: 10 // a multi-tap can be a bit off the initial position
    },

    getTouchAction: function() {
        return [TOUCH_ACTION_MANIPULATION];
    },

    process: function(input) {
        var options = this.options;

        var validPointers = input.pointers.length === options.pointers;
        var validMovement = input.distance < options.threshold;
        var validTouchTime = input.deltaTime < options.time;

        this.reset();

        if ((input.eventType & INPUT_START) && (this.count === 0)) {
            return this._failTimeout();
        }

        // we only allow little movement
        // and we've reached an end event, so a tap is possible
        if (validMovement && validTouchTime && validPointers) {
            if (input.eventType != INPUT_END) {
                return this._failTimeout();
            }

            var validInterval = this.pTime ? (input.timeStamp - this.pTime < options.interval) : true;
            var validMultiTap = !this.pCenter || getDistance(this.pCenter, input.center) < options.posThreshold;

            this.pTime = input.timeStamp;
            this.pCenter = input.center;

            if (!validMultiTap || !validInterval) {
                this.count = 1;
            } else {
                this.count += 1;
            }

            this._input = input;

            // if tap count matches we have recognized it,
            // else it has began recognizing...
            var tapCount = this.count % options.taps;
            if (tapCount === 0) {
                // no failing requirements, immediately trigger the tap event
                // or wait as long as the multitap interval to trigger
                if (!this.hasRequireFailures()) {
                    return STATE_RECOGNIZED;
                } else {
                    this._timer = setTimeoutScope(function() {
                        this.state = STATE_RECOGNIZED;
                        this.tryEmit();
                    }, options.interval, this);
                    return STATE_BEGAN;
                }
            }
        }
        return STATE_FAILED;
    },

    _failTimeout: function() {
        this._timer = setTimeoutScope(function() {
            this.state = STATE_FAILED;
        }, this.options.interval, this);
        return STATE_FAILED;
    },

    reset: function() {
        clearTimeout(this._timer);
    },

    emit: function() {
        if (this.state == STATE_RECOGNIZED ) {
            this._input.tapCount = this.count;
            this.manager.emit(this.options.event, this._input);
        }
    }
});

/**
 * Simple way to create an manager with a default set of recognizers.
 * @param {HTMLElement} element
 * @param {Object} [options]
 * @constructor
 */
function Hammer(element, options) {
    options = options || {};
    options.recognizers = ifUndefined(options.recognizers, Hammer.defaults.preset);
    return new Manager(element, options);
}

/**
 * @const {string}
 */
Hammer.VERSION = '2.0.0';

/**
 * default settings
 * @namespace
 */
Hammer.defaults = {
    /**
     * set if DOM events are being triggered.
     * But this is slower and unused by simple implementations, so disabled by default.
     * @type {Boolean}
     * @default false
     */
    domEvents: false,

    /**
     * The value for the touchAction property/fallback.
     * When set to `compute` it will magically set the correct value based on the added recognizers.
     * @type {String}
     * @default compute
     */
    touchAction: TOUCH_ACTION_COMPUTE,

    /**
     * @type {Boolean}
     * @default true
     */
    enable: true,

    /**
     * Default recognizer setup when calling `Hammer()`
     * When creating a new Manager these will be skipped.
     * @type {Array}
     */
    preset: [
        // RecognizerClass, options, [recognizeWith, ...], [requireFailure, ...]
        [RotateRecognizer, { enable: false }],
        [PinchRecognizer, { enable: false }, ['rotate']],
        [SwipeRecognizer,{ direction: DIRECTION_HORIZONTAL }],
        [PanRecognizer, { direction: DIRECTION_HORIZONTAL }, ['swipe']],
        [TapRecognizer],
        [TapRecognizer, { event: 'doubletap', taps: 2 }, ['tap']],
        [PressRecognizer]
    ],

    /**
     * Some CSS properties can be used to improve the working of Hammer.
     * Add them to this method and they will be set when creating a new Manager.
     * @namespace
     */
    cssProps: {
        /**
         * Disables text selection to improve the dragging gesture. When the value is `none` it also sets
         * `onselectstart=false` for IE9 on the element. Mainly for desktop browsers.
         * @type {String}
         * @default 'none'
         */
        userSelect: 'none',

        /**
         * Disable the Windows Phone grippers when pressing an element.
         * @type {String}
         * @default 'none'
         */
        touchSelect: 'none',

        /**
         * Disables the default callout shown when you touch and hold a touch target.
         * On iOS, when you touch and hold a touch target such as a link, Safari displays
         * a callout containing information about the link. This property allows you to disable that callout.
         * @type {String}
         * @default 'none'
         */
        touchCallout: 'none',

        /**
         * Specifies whether zooming is enabled. Used by IE10>
         * @type {String}
         * @default 'none'
         */
        contentZooming: 'none',

        /**
         * Specifies that an entire element should be draggable instead of its contents. Mainly for desktop browsers.
         * @type {String}
         * @default 'none'
         */
        userDrag: 'none',

        /**
         * Overrides the highlight color shown when the user taps a link or a JavaScript
         * clickable element in iOS. This property obeys the alpha value, if specified.
         * @type {String}
         * @default 'rgba(0,0,0,0)'
         */
        tapHighlightColor: 'rgba(0,0,0,0)'
    }
};

var STOP = 1;
var FORCED_STOP = 2;

/**
 * Manager
 * @param {HTMLElement} element
 * @param {Object} [options]
 * @constructor
 */
function Manager(element, options) {
    options = options || {};

    this.options = merge(options, Hammer.defaults);

    this.handlers = {};
    this.session = {};
    this.recognizers = [];

    this.element = element;
    this.input = createInputInstance(this);
    this.touchAction = new TouchAction(this, this.options.touchAction);

    toggleCssProps(this, true);

    each(options.recognizers, function(item) {
        var recognizer = this.add(new (item[0])(item[1]));
        item[2] && recognizer.recognizeWith(item[2]);
        item[3] && recognizer.requireFailure(item[2]);
    }, this);
}

Manager.prototype = {
    /**
     * set options
     * @param {Object} options
     * @returns {Manager}
     */
    set: function(options) {
        extend(this.options, options);
        return this;
    },

    /**
     * stop recognizing for this session.
     * This session will be discarded, when a new [input]start event is fired.
     * When forced, the recognizer cycle is stopped immediately.
     * @param {Boolean} [force]
     */
    stop: function(force) {
        this.session.stopped = force ? FORCED_STOP : STOP;
    },

    /**
     * run the recognizers!
     * called by the inputHandler function on every movement of the pointers (touches)
     * it walks through all the recognizers and tries to detect the gesture that is being made
     * @param {Object} inputData
     */
    recognize: function(inputData) {
        if (this.session.stopped) {
            return;
        }

        // run the touch-action polyfill
        this.touchAction.preventDefaults(inputData);

        var recognizer;
        var session = this.session;

        // this holds the recognizer that is being recognized.
        // so the recognizer's state needs to be BEGAN, CHANGED, ENDED or RECOGNIZED
        // if no recognizer is detecting a thing, it is set to `null`
        var curRecognizer = session.curRecognizer;

        // reset when the last recognizer is recognized
        // or when we're in a new session
        if (!curRecognizer || (curRecognizer && curRecognizer.state & STATE_RECOGNIZED)) {
            curRecognizer = session.curRecognizer = null;
        }

        for (var i = 0, len = this.recognizers.length; i < len; i++) {
            recognizer = this.recognizers[i];

            // find out if we are allowed try to recognize the input for this one.
            // 1.   allow if the session is NOT forced stopped (see the .stop() method)
            // 2.   allow if we still haven't recognized a gesture in this session, or the this recognizer is the one
            //      that is being recognized.
            // 3.   allow if the recognizer is allowed to run simultaneous with the current recognized recognizer.
            //      this can be setup with the `recognizeWith()` method on the recognizer.
            if (this.session.stopped !== FORCED_STOP && ( // 1
                    !curRecognizer || recognizer == curRecognizer || // 2
                    recognizer.canRecognizeWith(curRecognizer))) { // 3
                recognizer.recognize(inputData);
            } else {
                recognizer.reset();
            }

            // if the recognizer has been recognizing the input as a valid gesture, we want to store this one as the
            // current active recognizer. but only if we don't already have an active recognizer
            if (!curRecognizer && recognizer.state & (STATE_BEGAN | STATE_CHANGED | STATE_ENDED)) {
                curRecognizer = session.curRecognizer = recognizer;
            }
        }
    },

    /**
     * get a recognizer by its event name.
     * @param {Recognizer|String} recognizer
     * @returns {Recognizer|Null}
     */
    get: function(recognizer) {
        if (recognizer instanceof Recognizer) {
            return recognizer;
        }

        var recognizers = this.recognizers;
        for (var i = 0; i < recognizers.length; i++) {
            if (recognizers[i].options.event == recognizer) {
                return recognizers[i];
            }
        }
        return null;
    },

    /**
     * add a recognizer to the manager
     * existing recognizers with the same event name will be removed
     * @param {Recognizer} recognizer
     * @returns {Recognizer|Manager}
     */
    add: function(recognizer) {
        if (invokeArrayArg(recognizer, 'add', this)) {
            return this;
        }

        // remove existing
        var existing = this.get(recognizer.options.event);
        if (existing) {
            this.remove(existing);
        }

        this.recognizers.push(recognizer);
        recognizer.manager = this;

        this.touchAction.update();
        return recognizer;
    },

    /**
     * remove a recognizer by name or instance
     * @param {Recognizer|String} recognizer
     * @returns {Manager}
     */
    remove: function(recognizer) {
        if (invokeArrayArg(recognizer, 'remove', this)) {
            return this;
        }

        var recognizers = this.recognizers;
        recognizer = this.get(recognizer);
        recognizers.splice(inArray(recognizers, recognizer), 1);

        this.touchAction.update();
        return this;
    },

    /**
     * bind event
     * @param {String} events
     * @param {Function} handler
     * @returns {EventEmitter} this
     */
    on: function(events, handler) {
        var handlers = this.handlers;
        each(splitStr(events), function(event) {
            handlers[event] = handlers[event] || [];
            handlers[event].push(handler);
        });
        return this;
    },

    /**
     * unbind event, leave emit blank to remove all handlers
     * @param {String} events
     * @param {Function} [handler]
     * @returns {EventEmitter} this
     */
    off: function(events, handler) {
        var handlers = this.handlers;
        each(splitStr(events), function(event) {
            if (!handler) {
                delete handlers[event];
            } else {
                handlers[event].splice(inArray(handlers[event], handler), 1);
            }
        });
        return this;
    },

    /**
     * emit event to the listeners
     * @param {String} event
     * @param {Object} data
     */
    emit: function(event, data) {
        // we also want to trigger dom events
        if (this.options.domEvents) {
            triggerDomEvent(event, data);
        }

        // no handlers, so skip it all
        var handlers = this.handlers[event];
        if (!handlers || !handlers.length) {
            return;
        }

        data.type = event;
        data.preventDefault = function() {
            data.srcEvent.preventDefault();
        };

        for (var i = 0, len = handlers.length; i < len; i++) {
            handlers[i](data);
        }
    },

    /**
     * destroy the manager and unbinds all events
     * it doesn't unbind dom events, that is the user own responsibility
     */
    destroy: function() {
        this.element && toggleCssProps(this, false);

        this.handlers = {};
        this.session = {};
        this.input.destroy();
        this.element = null;
    }
};

/**
 * add/remove the css properties as defined in manager.options.cssProps
 * @param {Manager} manager
 * @param {Boolean} add
 */
function toggleCssProps(manager, add) {
    var element = manager.element;
    var cssProps = manager.options.cssProps;

    each(cssProps, function(value, name) {
        element.style[prefixed(element.style, name)] = add ? value : '';
    });

    var falseFn = add && function() { return false; };
    if (cssProps.userSelect == 'none') { element.onselectstart = falseFn; }
    if (cssProps.userDrag == 'none') { element.ondragstart = falseFn; }
}

/**
 * trigger dom event
 * @param {String} event
 * @param {Object} data
 */
function triggerDomEvent(event, data) {
    var gestureEvent = document.createEvent('Event');
    gestureEvent.initEvent(event, true, true);
    gestureEvent.gesture = data;
    data.target.dispatchEvent(gestureEvent);
}

extend(Hammer, {
    INPUT_START: INPUT_START,
    INPUT_MOVE: INPUT_MOVE,
    INPUT_END: INPUT_END,
    INPUT_CANCEL: INPUT_CANCEL,

    STATE_POSSIBLE: STATE_POSSIBLE,
    STATE_BEGAN: STATE_BEGAN,
    STATE_CHANGED: STATE_CHANGED,
    STATE_ENDED: STATE_ENDED,
    STATE_RECOGNIZED: STATE_RECOGNIZED,
    STATE_CANCELLED: STATE_CANCELLED,
    STATE_FAILED: STATE_FAILED,

    DIRECTION_NONE: DIRECTION_NONE,
    DIRECTION_LEFT: DIRECTION_LEFT,
    DIRECTION_RIGHT: DIRECTION_RIGHT,
    DIRECTION_UP: DIRECTION_UP,
    DIRECTION_DOWN: DIRECTION_DOWN,
    DIRECTION_HORIZONTAL: DIRECTION_HORIZONTAL,
    DIRECTION_VERTICAL: DIRECTION_VERTICAL,
    DIRECTION_ALL: DIRECTION_ALL,

    Manager: Manager,
    Input: Input,
    TouchAction: TouchAction,

    Recognizer: Recognizer,
    AttrRecognizer: AttrRecognizer,
    Tap: TapRecognizer,
    Pan: PanRecognizer,
    Swipe: SwipeRecognizer,
    Pinch: PinchRecognizer,
    Rotate: RotateRecognizer,
    Press: PressRecognizer,

    on: addEventListeners,
    off: removeEventListeners,
    each: each,
    merge: merge,
    extend: extend,
    inherit: inherit,
    bindFn: bindFn,
    prefixed: prefixed
});

if (typeof define == TYPE_FUNCTION && define.amd) {
    define(function() {
        return Hammer;
    });
} else if (typeof module != TYPE_UNDEFINED && module.exports) {
    module.exports = Hammer;
} else {
    window.Hammer = Hammer;
}

})(window);