hammer.js

/*! Hammer.JS - v2.0.8 - 2016-09-30
 * http://hammerjs.github.io/
 *
 * Copyright (c)  Jorik Tangelder;
 * Licensed under the MIT license */
(function(window, document, exportName, undefined) { 
'use strict';
/**
 * @private
 * use the val2 when val1 is undefined
 * @param {*} val1
 * @param {*} val2
 * @returns {*}
 */
function ifUndefined(val1, val2) {
  return val1 === undefined ? val2 : val1;
}

var VENDOR_PREFIXES = ['', 'webkit', 'Moz', 'MS', 'ms', 'o'];
var TEST_ELEMENT = document.createElement('div');

var TYPE_FUNCTION = 'function';

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

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

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

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

function getTouchActionProps() {
  if (!NATIVE_TOUCH_ACTION) {
    return false;
  }
  var touchMap = {};
  var cssSupports = window.CSS && window.CSS.supports;
  ['auto', 'manipulation', 'pan-y', 'pan-x', 'pan-x pan-y', 'none'].forEach(function (val) {

    // If css.supports is not supported but there is native touch-action assume it supports
    // all values. This is the case for IE 10 and 11.
    return touchMap[val] = cssSupports ? window.CSS.supports('touch-action', val) : true;
  });
  return touchMap;
}

var PREFIXED_TOUCH_ACTION = prefixed(TEST_ELEMENT.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'; // not implemented
var TOUCH_ACTION_NONE = 'none';
var TOUCH_ACTION_PAN_X = 'pan-x';
var TOUCH_ACTION_PAN_Y = 'pan-y';
var TOUCH_ACTION_MAP = getTouchActionProps();

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'];

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;

/**
 * @private
 * extend object.
 * means that properties in dest will be overwritten by the ones in src.
 * @param {Object} target
 * @param {...Object} objects_to_assign
 * @returns {Object} target
 */
var assign = void 0;
if (typeof Object.assign !== 'function') {
  assign = function assign(target) {
    if (target === undefined || target === null) {
      throw new TypeError('Cannot convert undefined or null to object');
    }

    var output = Object(target);
    for (var index = 1; index < arguments.length; index++) {
      var source = arguments[index];
      if (source !== undefined && source !== null) {
        for (var nextKey in source) {
          if (source.hasOwnProperty(nextKey)) {
            output[nextKey] = source[nextKey];
          }
        }
      }
    }
    return output;
  };
} else {
  assign = Object.assign;
}

var assign$1 = assign;

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

/**
 * @private
 * walk objects and arrays
 * @param {Object} obj
 * @param {Function} iterator
 * @param {Object} context
 */
function each(obj, iterator, context) {
  var i = void 0;

  if (!obj) {
    return;
  }

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

/**
 * @private
 * 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;
}

/**
 * @private
 * 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 {
    var i = 0;
    while (i < src.length) {
      if (findByKey && src[i][findByKey] == find || !findByKey && src[i] === find) {
        // do not use === here, test fails
        return i;
      }
      i++;
    }
    return -1;
  }
}

var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) {
  return typeof obj;
} : function (obj) {
  return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
};

var asyncGenerator = function () {
  function AwaitValue(value) {
    this.value = value;
  }

  function AsyncGenerator(gen) {
    var front, back;

    function send(key, arg) {
      return new Promise(function (resolve, reject) {
        var request = {
          key: key,
          arg: arg,
          resolve: resolve,
          reject: reject,
          next: null
        };

        if (back) {
          back = back.next = request;
        } else {
          front = back = request;
          resume(key, arg);
        }
      });
    }

    function resume(key, arg) {
      try {
        var result = gen[key](arg);
        var value = result.value;

        if (value instanceof AwaitValue) {
          Promise.resolve(value.value).then(function (arg) {
            resume("next", arg);
          }, function (arg) {
            resume("throw", arg);
          });
        } else {
          settle(result.done ? "return" : "normal", result.value);
        }
      } catch (err) {
        settle("throw", err);
      }
    }

    function settle(type, value) {
      switch (type) {
        case "return":
          front.resolve({
            value: value,
            done: true
          });
          break;

        case "throw":
          front.reject(value);
          break;

        default:
          front.resolve({
            value: value,
            done: false
          });
          break;
      }

      front = front.next;

      if (front) {
        resume(front.key, front.arg);
      } else {
        back = null;
      }
    }

    this._invoke = send;

    if (typeof gen.return !== "function") {
      this.return = undefined;
    }
  }

  if (typeof Symbol === "function" && Symbol.asyncIterator) {
    AsyncGenerator.prototype[Symbol.asyncIterator] = function () {
      return this;
    };
  }

  AsyncGenerator.prototype.next = function (arg) {
    return this._invoke("next", arg);
  };

  AsyncGenerator.prototype.throw = function (arg) {
    return this._invoke("throw", arg);
  };

  AsyncGenerator.prototype.return = function (arg) {
    return this._invoke("return", arg);
  };

  return {
    wrap: function (fn) {
      return function () {
        return new AsyncGenerator(fn.apply(this, arguments));
      };
    },
    await: function (value) {
      return new AwaitValue(value);
    }
  };
}();

var classCallCheck = function (instance, Constructor) {
  if (!(instance instanceof Constructor)) {
    throw new TypeError("Cannot call a class as a function");
  }
};

var createClass = function () {
  function defineProperties(target, props) {
    for (var i = 0; i < props.length; i++) {
      var descriptor = props[i];
      descriptor.enumerable = descriptor.enumerable || false;
      descriptor.configurable = true;
      if ("value" in descriptor) descriptor.writable = true;
      Object.defineProperty(target, descriptor.key, descriptor);
    }
  }

  return function (Constructor, protoProps, staticProps) {
    if (protoProps) defineProperties(Constructor.prototype, protoProps);
    if (staticProps) defineProperties(Constructor, staticProps);
    return Constructor;
  };
}();

var get = function get(object, property, receiver) {
  if (object === null) object = Function.prototype;
  var desc = Object.getOwnPropertyDescriptor(object, property);

  if (desc === undefined) {
    var parent = Object.getPrototypeOf(object);

    if (parent === null) {
      return undefined;
    } else {
      return get(parent, property, receiver);
    }
  } else if ("value" in desc) {
    return desc.value;
  } else {
    var getter = desc.get;

    if (getter === undefined) {
      return undefined;
    }

    return getter.call(receiver);
  }
};

var inherits = function (subClass, superClass) {
  if (typeof superClass !== "function" && superClass !== null) {
    throw new TypeError("Super expression must either be null or a function, not " + typeof superClass);
  }

  subClass.prototype = Object.create(superClass && superClass.prototype, {
    constructor: {
      value: subClass,
      enumerable: false,
      writable: true,
      configurable: true
    }
  });
  if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass;
};

var possibleConstructorReturn = function (self, call) {
  if (!self) {
    throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
  }

  return call && (typeof call === "object" || typeof call === "function") ? call : self;
};

var slicedToArray = function () {
  function sliceIterator(arr, i) {
    var _arr = [];
    var _n = true;
    var _d = false;
    var _e = undefined;

    try {
      for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) {
        _arr.push(_s.value);

        if (i && _arr.length === i) break;
      }
    } catch (err) {
      _d = true;
      _e = err;
    } finally {
      try {
        if (!_n && _i["return"]) _i["return"]();
      } finally {
        if (_d) throw _e;
      }
    }

    return _arr;
  }

  return function (arr, i) {
    if (Array.isArray(arr)) {
      return arr;
    } else if (Symbol.iterator in Object(arr)) {
      return sliceIterator(arr, i);
    } else {
      throw new TypeError("Invalid attempt to destructure non-iterable instance");
    }
  };
}();

/**
 * @private
 * 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 === 'undefined' ? 'undefined' : _typeof(val)) === TYPE_FUNCTION) {
    return val.apply(args ? args[0] || undefined : undefined, args);
  }
  return val;
}

/**
 * @private
 * 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;
}

/**
 * @private
 * get a usable string, used as event postfix
 * @param {constant} 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 '';
}

/**
 * @private
 * 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
 */

/**
 * @private
 * Recognizer
 * Every recognizer needs to extend from this class.
 * @constructor
 * @param {Object} options
 */

var Recognizer = function () {
  function Recognizer(options) {
    classCallCheck(this, Recognizer);

    this.options = assign$1({}, this.defaults, options || {});

    this.id = uniqueId();

    this.manager = null;

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

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

  /**
   * @private
   * set options
   * @param {Object} options
   * @return {Recognizer}
   */


  createClass(Recognizer, [{
    key: 'set',
    value: function set(options) {
      assign$1(this.options, options);

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

    /**
     * @private
     * recognize simultaneous with an other recognizer.
     * @param {Recognizer} otherRecognizer
     * @returns {Recognizer} this
     */

  }, {
    key: 'recognizeWith',
    value: function recognizeWith(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;
    }

    /**
     * @private
     * drop the simultaneous link. it doesnt remove the link on the other recognizer.
     * @param {Recognizer} otherRecognizer
     * @returns {Recognizer} this
     */

  }, {
    key: 'dropRecognizeWith',
    value: function dropRecognizeWith(otherRecognizer) {
      if (invokeArrayArg(otherRecognizer, 'dropRecognizeWith', this)) {
        return this;
      }

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

    /**
     * @private
     * recognizer can only run when an other is failing
     * @param {Recognizer} otherRecognizer
     * @returns {Recognizer} this
     */

  }, {
    key: 'requireFailure',
    value: function requireFailure(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;
    }

    /**
     * @private
     * drop the requireFailure link. it does not remove the link on the other recognizer.
     * @param {Recognizer} otherRecognizer
     * @returns {Recognizer} this
     */

  }, {
    key: 'dropRequireFailure',
    value: function dropRequireFailure(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;
    }

    /**
     * @private
     * has require failures boolean
     * @returns {boolean}
     */

  }, {
    key: 'hasRequireFailures',
    value: function hasRequireFailures() {
      return this.requireFail.length > 0;
    }

    /**
     * @private
     * if the recognizer can recognize simultaneous with an other recognizer
     * @param {Recognizer} otherRecognizer
     * @returns {Boolean}
     */

  }, {
    key: 'canRecognizeWith',
    value: function canRecognizeWith(otherRecognizer) {
      return !!this.simultaneous[otherRecognizer.id];
    }

    /**
     * @private
     * You should use `tryEmit` instead of `emit` directly to check
     * that all the needed recognizers has failed before emitting.
     * @param {Object} input
     */

  }, {
    key: 'emit',
    value: function emit(input) {
      var self = this;
      var state = this.state;


      function emit(event) {
        self.manager.emit(event, input);
      }

      // 'panstart' and 'panmove'
      if (state < STATE_ENDED) {
        emit(self.options.event + stateStr(state));
      }

      emit(self.options.event); // simple 'eventName' events

      if (input.additionalEvent) {
        // additional event(panleft, panright, pinchin, pinchout...)
        emit(input.additionalEvent);
      }

      // panend and pancancel
      if (state >= STATE_ENDED) {
        emit(self.options.event + stateStr(state));
      }
    }

    /**
     * @private
     * 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
     */

  }, {
    key: 'tryEmit',
    value: function tryEmit(input) {
      if (this.canEmit()) {
        return this.emit(input);
      }
      // it's failing anyway
      this.state = STATE_FAILED;
    }

    /**
     * @private
     * can we emit?
     * @returns {boolean}
     */

  }, {
    key: 'canEmit',
    value: function canEmit() {
      var i = 0;
      while (i < this.requireFail.length) {
        if (!(this.requireFail[i].state & (STATE_FAILED | STATE_POSSIBLE))) {
          return false;
        }
        i++;
      }
      return true;
    }

    /**
     * @private
     * update the recognizer
     * @param {Object} inputData
     */

  }, {
    key: 'recognize',
    value: function recognize(inputData) {
      // make a new copy of the inputData
      // so we can change the inputData without messing up the other recognizers
      var inputDataClone = assign$1({}, 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);
      }
    }

    /**
     * @private
     * return the state of the recognizer
     * the actual recognizing happens in this method
     * @virtual
     * @param {Object} inputData
     * @returns {constant} STATE
     */

    /* jshint ignore:start */

  }, {
    key: 'process',
    value: function process(inputData) {}
    /* jshint ignore:end */

    /**
     * @private
     * return the preferred touch-action
     * @virtual
     * @returns {Array}
     */

  }, {
    key: 'getTouchAction',
    value: function getTouchAction() {}

    /**
     * @private
     * called when the gesture isn't allowed to recognize
     * like when another is being recognized or it is disabled
     * @virtual
     */

  }, {
    key: 'reset',
    value: function reset() {}
  }]);
  return Recognizer;
}();

Recognizer.prototype.defaults = {};

/**
 * @private
 * This recognizer is just used as a base for the simple attribute recognizers.
 * @constructor
 * @extends Recognizer
 */

var AttrRecognizer = function (_Recognizer) {
  inherits(AttrRecognizer, _Recognizer);

  function AttrRecognizer() {
    classCallCheck(this, AttrRecognizer);
    return possibleConstructorReturn(this, (AttrRecognizer.__proto__ || Object.getPrototypeOf(AttrRecognizer)).apply(this, arguments));
  }

  /**
   * @private
   * Used to check if it the recognizer receives valid input, like input.distance > 10.
   * @memberof AttrRecognizer
   * @param {Object} input
   * @returns {Boolean} recognized
   */


  createClass(AttrRecognizer, [{
    key: 'attrTest',
    value: function attrTest(input) {
      var optionPointers = this.options.pointers;
      return optionPointers === 0 || input.pointers.length === optionPointers;
    }

    /**
     * @private
     * Process the input and return the state for the recognizer
     * @memberof AttrRecognizer
     * @param {Object} input
     * @returns {*} State
     */

  }, {
    key: 'process',
    value: function process(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;
    }
  }]);
  return AttrRecognizer;
}(Recognizer);

AttrRecognizer.prototype.defaults = {
  /**
   * @private
   * @type {Number}
   * @default 1
   */
  pointers: 1
};

/**
 * @private
 * Rotate
 * Recognized when two or more pointer are moving in a circular motion.
 * @constructor
 * @extends AttrRecognizer
 */

var RotateRecognizer = function (_AttrRecognizer) {
  inherits(RotateRecognizer, _AttrRecognizer);

  function RotateRecognizer() {
    classCallCheck(this, RotateRecognizer);
    return possibleConstructorReturn(this, (RotateRecognizer.__proto__ || Object.getPrototypeOf(RotateRecognizer)).apply(this, arguments));
  }

  createClass(RotateRecognizer, [{
    key: 'getTouchAction',
    value: function getTouchAction() {
      return [TOUCH_ACTION_NONE];
    }
  }, {
    key: 'attrTest',
    value: function attrTest(input) {
      return get(RotateRecognizer.prototype.__proto__ || Object.getPrototypeOf(RotateRecognizer.prototype), 'attrTest', this).call(this, input) && (Math.abs(input.rotation) > this.options.threshold || this.state & STATE_BEGAN);
    }
  }]);
  return RotateRecognizer;
}(AttrRecognizer);

RotateRecognizer.prototype.defaults = {
  event: 'rotate',
  threshold: 0,
  pointers: 2
};

/**
 * @private
 * Pinch
 * Recognized when two or more pointers are moving toward (zoom-in) or away from each other (zoom-out).
 * @constructor
 * @extends AttrRecognizer
 */

var PinchRecognizer = function (_AttrRecognizer) {
  inherits(PinchRecognizer, _AttrRecognizer);

  function PinchRecognizer() {
    classCallCheck(this, PinchRecognizer);
    return possibleConstructorReturn(this, (PinchRecognizer.__proto__ || Object.getPrototypeOf(PinchRecognizer)).apply(this, arguments));
  }

  createClass(PinchRecognizer, [{
    key: 'getTouchAction',
    value: function getTouchAction() {
      return [TOUCH_ACTION_NONE];
    }
  }, {
    key: 'attrTest',
    value: function attrTest(input) {
      return get(PinchRecognizer.prototype.__proto__ || Object.getPrototypeOf(PinchRecognizer.prototype), 'attrTest', this).call(this, input) && (Math.abs(input.scale - 1) > this.options.threshold || this.state & STATE_BEGAN);
    }
  }, {
    key: 'emit',
    value: function emit(input) {
      if (input.scale !== 1) {
        var inOut = input.scale < 1 ? 'in' : 'out';
        input.additionalEvent = this.options.event + inOut;
      }
      get(PinchRecognizer.prototype.__proto__ || Object.getPrototypeOf(PinchRecognizer.prototype), 'emit', this).call(this, input);
    }
  }]);
  return PinchRecognizer;
}(AttrRecognizer);

PinchRecognizer.prototype.defaults = {
  event: 'pinch',
  threshold: 0,
  pointers: 2
};

/**
 * @private
 * direction cons to string
 * @param {constant} 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 '';
}

/**
 * @private
 * Pan
 * Recognized when the pointer is down and moved in the allowed direction.
 * @constructor
 * @extends AttrRecognizer
 */

var PanRecognizer = function (_AttrRecognizer) {
  inherits(PanRecognizer, _AttrRecognizer);

  function PanRecognizer() {
    classCallCheck(this, PanRecognizer);

    var _this = possibleConstructorReturn(this, (PanRecognizer.__proto__ || Object.getPrototypeOf(PanRecognizer)).apply(this, arguments));

    _this.pX = null;
    _this.pY = null;
    return _this;
  }

  createClass(PanRecognizer, [{
    key: 'getTouchAction',
    value: function getTouchAction() {
      var direction = this.options.direction;

      var actions = [];
      if (direction & DIRECTION_HORIZONTAL) {
        actions.push(TOUCH_ACTION_PAN_Y);
      }
      if (direction & DIRECTION_VERTICAL) {
        actions.push(TOUCH_ACTION_PAN_X);
      }
      return actions;
    }
  }, {
    key: 'directionTest',
    value: function directionTest(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;
    }
  }, {
    key: 'attrTest',
    value: function attrTest(input) {
      return AttrRecognizer.prototype.attrTest.call(this, input) && ( // replace with a super call
      this.state & STATE_BEGAN || !(this.state & STATE_BEGAN) && this.directionTest(input));
    }
  }, {
    key: 'emit',
    value: function emit(input) {

      this.pX = input.deltaX;
      this.pY = input.deltaY;

      var direction = directionStr(input.direction);

      if (direction) {
        input.additionalEvent = this.options.event + direction;
      }
      get(PanRecognizer.prototype.__proto__ || Object.getPrototypeOf(PanRecognizer.prototype), 'emit', this).call(this, input);
    }
  }]);
  return PanRecognizer;
}(AttrRecognizer);

PanRecognizer.prototype.defaults = {
  event: 'pan',
  threshold: 10,
  pointers: 1,
  direction: DIRECTION_ALL
};

/**
 * @private
 * Swipe
 * Recognized when the pointer is moving fast (velocity), with enough distance in the allowed direction.
 * @constructor
 * @extends AttrRecognizer
 */

var SwipeRecognizer = function (_AttrRecognizer) {
  inherits(SwipeRecognizer, _AttrRecognizer);

  function SwipeRecognizer() {
    classCallCheck(this, SwipeRecognizer);
    return possibleConstructorReturn(this, (SwipeRecognizer.__proto__ || Object.getPrototypeOf(SwipeRecognizer)).apply(this, arguments));
  }

  createClass(SwipeRecognizer, [{
    key: 'getTouchAction',
    value: function getTouchAction() {
      return PanRecognizer.prototype.getTouchAction.call(this);
    }
  }, {
    key: 'attrTest',
    value: function attrTest(input) {
      var direction = this.options.direction;

      var velocity = void 0;

      if (direction & (DIRECTION_HORIZONTAL | DIRECTION_VERTICAL)) {
        velocity = input.overallVelocity;
      } else if (direction & DIRECTION_HORIZONTAL) {
        velocity = input.overallVelocityX;
      } else if (direction & DIRECTION_VERTICAL) {
        velocity = input.overallVelocityY;
      }

      return get(SwipeRecognizer.prototype.__proto__ || Object.getPrototypeOf(SwipeRecognizer.prototype), 'attrTest', this).call(this, input) && direction & input.offsetDirection && input.distance > this.options.threshold && input.maxPointers === this.options.pointers && abs(velocity) > this.options.velocity && input.eventType & INPUT_END;
    }
  }, {
    key: 'emit',
    value: function emit(input) {
      var direction = directionStr(input.offsetDirection);
      if (direction) {
        this.manager.emit(this.options.event + direction, input);
      }

      this.manager.emit(this.options.event, input);
    }
  }]);
  return SwipeRecognizer;
}(AttrRecognizer);

SwipeRecognizer.prototype.defaults = {
  event: 'swipe',
  threshold: 10,
  velocity: 0.3,
  direction: DIRECTION_HORIZONTAL | DIRECTION_VERTICAL,
  pointers: 1
};

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

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

/**
 * @private
 * 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]];
  var y = p2[props[1]] - p1[props[1]];

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

/**
 * @private
 * A tap is recognized 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
 */

var TapRecognizer = function (_Recognizer) {
  inherits(TapRecognizer, _Recognizer);

  function TapRecognizer() {
    classCallCheck(this, TapRecognizer);

    // previous time and center,
    // used for tap counting
    var _this = possibleConstructorReturn(this, (TapRecognizer.__proto__ || Object.getPrototypeOf(TapRecognizer)).apply(this, arguments));

    _this.pTime = false;
    _this.pCenter = false;

    _this._timer = null;
    _this._input = null;
    _this.count = 0;
    return _this;
  }

  createClass(TapRecognizer, [{
    key: 'getTouchAction',
    value: function getTouchAction() {
      return [TOUCH_ACTION_MANIPULATION];
    }
  }, {
    key: 'process',
    value: function process(input) {
      var _this2 = this;

      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 = setTimeoutContext(function () {
              _this2.state = STATE_RECOGNIZED;
              _this2.tryEmit();
            }, options.interval, this);
            return STATE_BEGAN;
          }
        }
      }
      return STATE_FAILED;
    }
  }, {
    key: 'failTimeout',
    value: function failTimeout() {
      var _this3 = this;

      this._timer = setTimeoutContext(function () {
        _this3.state = STATE_FAILED;
      }, this.options.interval, this);
      return STATE_FAILED;
    }
  }, {
    key: 'reset',
    value: function reset() {
      clearTimeout(this._timer);
    }
  }, {
    key: 'emit',
    value: function emit() {
      if (this.state === STATE_RECOGNIZED) {
        this._input.tapCount = this.count;
        this.manager.emit(this.options.event, this._input);
      }
    }
  }]);
  return TapRecognizer;
}(Recognizer);

TapRecognizer.prototype.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: 9, // a minimal movement is ok, but keep it low
  posThreshold: 10 // a multi-tap can be a bit off the initial position
};

/**
 * @private
 * Press
 * Recognized when the pointer is down for x ms without any movement.
 * @constructor
 * @extends Recognizer
 */

var PressRecognizer = function (_Recognizer) {
  inherits(PressRecognizer, _Recognizer);

  function PressRecognizer() {
    classCallCheck(this, PressRecognizer);

    var _this = possibleConstructorReturn(this, (PressRecognizer.__proto__ || Object.getPrototypeOf(PressRecognizer)).apply(this, arguments));

    _this._timer = null;
    _this._input = null;
    return _this;
  }

  createClass(PressRecognizer, [{
    key: 'getTouchAction',
    value: function getTouchAction() {
      return [TOUCH_ACTION_AUTO];
    }
  }, {
    key: 'process',
    value: function process(input) {
      var _this2 = this;

      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 = setTimeoutContext(function () {
          _this2.state = STATE_RECOGNIZED;
          _this2.tryEmit();
        }, options.time, this);
      } else if (input.eventType & INPUT_END) {
        return STATE_RECOGNIZED;
      }
      return STATE_FAILED;
    }
  }, {
    key: 'reset',
    value: function reset() {
      clearTimeout(this._timer);
    }
  }, {
    key: 'emit',
    value: function emit(input) {
      if (this.state !== STATE_RECOGNIZED) {
        return;
      }

      if (input && input.eventType & INPUT_END) {
        this.manager.emit(this.options.event + 'up', input);
      } else {
        this._input.timeStamp = now();
        this.manager.emit(this.options.event, this._input);
      }
    }
  }]);
  return PressRecognizer;
}(Recognizer);

PressRecognizer.prototype.defaults = {
  event: 'press',
  pointers: 1,
  time: 251, // minimal time of the pointer to be pressed
  threshold: 9 // a minimal movement is ok, but keep it low
};

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

/**
 * @private
 * 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);

  // if both pan-x and pan-y are set (different recognizers
  // for different directions, e.g. horizontal pan but vertical swipe?)
  // we need none (as otherwise with pan-x pan-y combined none of these
  // recognizers will work, since the browser would handle all panning
  if (hasPanX && hasPanY) {
    return TOUCH_ACTION_NONE;
  }

  // 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;
}

/**
 * @private
 * Touch Action
 * sets the touchAction property or uses the js alternative
 * @param {Manager} manager
 * @param {String} value
 * @constructor
 */

var TouchAction = function () {
  function TouchAction(manager, value) {
    classCallCheck(this, TouchAction);

    this.manager = manager;
    this.set(value);
  }

  /**
   * @private
   * set the touchAction value on the element or enable the polyfill
   * @param {String} value
   */


  createClass(TouchAction, [{
    key: 'set',
    value: function set(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 && TOUCH_ACTION_MAP[value]) {
        this.manager.element.style[PREFIXED_TOUCH_ACTION] = value;
      }
      this.actions = value.toLowerCase().trim();
    }

    /**
     * @private
     * just re-set the touchAction value
     */

  }, {
    key: 'update',
    value: function update() {
      this.set(this.manager.options.touchAction);
    }

    /**
     * @private
     * compute the value for the touchAction property based on the recognizer's settings
     * @returns {String} value
     */

  }, {
    key: 'compute',
    value: function compute() {
      var actions = [];
      each(this.manager.recognizers, function (recognizer) {
        if (boolOrFn(recognizer.options.enable, [recognizer])) {
          actions = actions.concat(recognizer.getTouchAction());
        }
      });
      return cleanTouchActions(actions.join(' '));
    }

    /**
     * @private
     * this method is called on each input cycle and provides the preventing of the browser behavior
     * @param {Object} input
     */

  }, {
    key: 'preventDefaults',
    value: function preventDefaults(input) {
      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) && !TOUCH_ACTION_MAP[TOUCH_ACTION_NONE];
      var hasPanY = inStr(actions, TOUCH_ACTION_PAN_Y) && !TOUCH_ACTION_MAP[TOUCH_ACTION_PAN_Y];
      var hasPanX = inStr(actions, TOUCH_ACTION_PAN_X) && !TOUCH_ACTION_MAP[TOUCH_ACTION_PAN_X];

      if (hasNone) {
        // do not prevent defaults if this is a tap gesture
        var isTapPointer = input.pointers.length === 1;
        var isTapMovement = input.distance < 2;
        var isTapTouchTime = input.deltaTime < 250;

        if (isTapPointer && isTapMovement && isTapTouchTime) {
          return;
        }
      }

      if (hasPanX && hasPanY) {
        // `pan-x pan-y` means browser handles all scrolling/panning, do not prevent
        return;
      }

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

    /**
     * @private
     * call preventDefault to prevent the browser's default behavior (scrolling in most cases)
     * @param {Object} srcEvent
     */

  }, {
    key: 'preventSrc',
    value: function preventSrc(srcEvent) {
      this.manager.session.prevented = true;
      srcEvent.preventDefault();
    }
  }]);
  return TouchAction;
}();

/**
 * @private
 * 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;
}

/**
 * @private
 * 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;
  var y = 0;
  var i = 0;
  while (i < pointersLength) {
    x += pointers[i].clientX;
    y += pointers[i].clientY;
    i++;
  }

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

/**
 * @private
 * 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 = [];
  var i = 0;
  while (i < input.pointers.length) {
    pointers[i] = {
      clientX: round(input.pointers[i].clientX),
      clientY: round(input.pointers[i].clientY)
    };
    i++;
  }

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

/**
 * @private
 * 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]];
  var y = p2[props[1]] - p1[props[1]];
  return Math.atan2(y, x) * 180 / Math.PI;
}

/**
 * @private
 * 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 (abs(x) >= abs(y)) {
    return x < 0 ? DIRECTION_LEFT : DIRECTION_RIGHT;
  }
  return y < 0 ? DIRECTION_UP : DIRECTION_DOWN;
}

function computeDeltaXY(session, input) {
  var center = input.center;
  // let { offsetDelta:offset = {}, prevDelta = {}, prevInput = {} } = session;
  // jscs throwing error on defalut destructured values and without defaults tests fail

  var offset = session.offsetDelta || {};
  var prevDelta = session.prevDelta || {};
  var prevInput = session.prevInput || {};

  if (input.eventType === INPUT_START || prevInput.eventType === INPUT_END) {
    prevDelta = session.prevDelta = {
      x: prevInput.deltaX || 0,
      y: prevInput.deltaY || 0
    };

    offset = session.offsetDelta = {
      x: center.x,
      y: center.y
    };
  }

  input.deltaX = prevDelta.x + (center.x - offset.x);
  input.deltaY = prevDelta.y + (center.y - offset.y);
}

/**
 * @private
 * 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: x / deltaTime || 0,
    y: y / deltaTime || 0
  };
}

/**
 * @private
 * 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);
}

/**
 * @private
 * 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);
}

/**
 * @private
 * velocity is calculated every x ms
 * @param {Object} session
 * @param {Object} input
 */
function computeIntervalInputData(session, input) {
  var last = session.lastInterval || input;
  var deltaTime = input.timeStamp - last.timeStamp;
  var velocity = void 0;
  var velocityX = void 0;
  var velocityY = void 0;
  var direction = void 0;

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

    var v = getVelocity(deltaTime, deltaX, deltaY);
    velocityX = v.x;
    velocityY = v.y;
    velocity = abs(v.x) > abs(v.y) ? v.x : v.y;
    direction = getDirection(deltaX, deltaY);

    session.lastInterval = input;
  } 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;
}

/**
* @private
 * 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 = input.center = getCenter(pointers);
  input.timeStamp = now();
  input.deltaTime = input.timeStamp - firstInput.timeStamp;

  input.angle = getAngle(offsetCenter, center);
  input.distance = getDistance(offsetCenter, center);

  computeDeltaXY(session, input);
  input.offsetDirection = getDirection(input.deltaX, input.deltaY);

  var overallVelocity = getVelocity(input.deltaTime, input.deltaX, input.deltaY);
  input.overallVelocityX = overallVelocity.x;
  input.overallVelocityY = overallVelocity.y;
  input.overallVelocity = abs(overallVelocity.x) > abs(overallVelocity.y) ? overallVelocity.x : overallVelocity.y;

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

  input.maxPointers = !session.prevInput ? input.pointers.length : input.pointers.length > session.prevInput.maxPointers ? input.pointers.length : session.prevInput.maxPointers;

  computeIntervalInputData(session, input);

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

/**
 * @private
 * 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);
  manager.session.prevInput = input;
}

/**
 * @private
 * split string on whitespace
 * @param {String} str
 * @returns {Array} words
 */

function splitStr(str) {
  return str.trim().split(/\s+/g);
}

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

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

/**
 * @private
 * get the window object of an element
 * @param {HTMLElement} element
 * @returns {DocumentView|Window}
 */
function getWindowForElement(element) {
  var doc = element.ownerDocument || element;
  return doc.defaultView || doc.parentWindow || window;
}

/**
 * @private
 * create new input type manager
 * @param {Manager} manager
 * @param {Function} callback
 * @returns {Input}
 * @constructor
 */

var Input = function () {
  function Input(manager, callback) {
    classCallCheck(this, Input);

    var self = this;
    this.manager = manager;
    this.callback = callback;
    this.element = manager.element;
    this.target = manager.options.inputTarget;

    // 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(manager.options.enable, [manager])) {
        self.handler(ev);
      }
    };

    this.init();
  }
  /**
   * @private
   * should handle the inputEvent data and trigger the callback
   * @virtual
   */


  createClass(Input, [{
    key: 'handler',
    value: function handler() {}

    /**
     * @private
     * bind the events
     */

  }, {
    key: 'init',
    value: function init() {
      this.evEl && addEventListeners(this.element, this.evEl, this.domHandler);
      this.evTarget && addEventListeners(this.target, this.evTarget, this.domHandler);
      this.evWin && addEventListeners(getWindowForElement(this.element), this.evWin, this.domHandler);
    }

    /**
     * @private
     * unbind the events
     */

  }, {
    key: 'destroy',
    value: function destroy() {
      this.evEl && removeEventListeners(this.element, this.evEl, this.domHandler);
      this.evTarget && removeEventListeners(this.target, this.evTarget, this.domHandler);
      this.evWin && removeEventListeners(getWindowForElement(this.element), this.evWin, this.domHandler);
    }
  }]);
  return Input;
}();

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 pointerup pointercancel';

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

/**
 * @private
 * Pointer events input
 * @constructor
 * @extends Input
 */

var PointerEventInput = function (_Input) {
  inherits(PointerEventInput, _Input);

  function PointerEventInput() {
    classCallCheck(this, PointerEventInput);

    var _this = possibleConstructorReturn(this, (PointerEventInput.__proto__ || Object.getPrototypeOf(PointerEventInput)).apply(this, arguments));

    _this.evEl = POINTER_ELEMENT_EVENTS;
    _this.evWin = POINTER_WINDOW_EVENTS;

    _this.store = _this.manager.session.pointerEvents = [];
    return _this;
  }

  /**
   * @private
   * handle mouse events
   * @param {Object} ev
   */


  createClass(PointerEventInput, [{
    key: 'handler',
    value: function handler(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;

      var isTouch = pointerType === INPUT_TYPE_TOUCH;

      // get index of the event in the store
      var storeIndex = inArray(store, ev.pointerId, 'pointerId');

      // start and mouse must be down
      if (eventType & INPUT_START && (ev.button === 0 || isTouch)) {
        if (storeIndex < 0) {
          store.push(ev);
          storeIndex = store.length - 1;
        }
      } else if (eventType & (INPUT_END | INPUT_CANCEL)) {
        removePointer = true;
      }

      // it not found, so the pointer hasn't been down (so it's probably a hover)
      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);
      }
    }
  }]);
  return PointerEventInput;
}(Input);

/**
 * @private
 * convert array-like objects to real arrays
 * @param {Object} obj
 * @returns {Array}
 */
function toArray$1(obj) {
  return Array.prototype.slice.call(obj, 0);
}

/**
 * @private
 * 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]
 * @param {Boolean} [sort=False]
 * @returns {Array} [{id:1},{id:2}]
 */
function uniqueArray(src, key, sort) {
  var results = [];
  var values = [];
  var i = 0;

  while (i < src.length) {
    var val = key ? src[i][key] : src[i];
    if (inArray(values, val) < 0) {
      results.push(src[i]);
    }
    values[i] = val;
    i++;
  }

  if (sort) {
    if (!key) {
      results = results.sort();
    } else {
      results = results.sort(function (a, b) {
        return a[key] > b[key];
      });
    }
  }

  return results;
}

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

var TOUCH_TARGET_EVENTS = 'touchstart touchmove touchend touchcancel';

/**
 * @private
 * Multi-user touch events input
 * @constructor
 * @extends Input
 */

var TouchInput = function (_Input) {
  inherits(TouchInput, _Input);

  function TouchInput() {
    classCallCheck(this, TouchInput);

    TouchInput.prototype.evTarget = TOUCH_TARGET_EVENTS;
    TouchInput.prototype.targetIds = {};

    var _this = possibleConstructorReturn(this, (TouchInput.__proto__ || Object.getPrototypeOf(TouchInput)).apply(this, arguments));

    _this.evTarget = TOUCH_TARGET_EVENTS;
    _this.targetIds = {};
    return _this;
  }

  createClass(TouchInput, [{
    key: 'handler',
    value: function handler(ev) {
      var type = TOUCH_INPUT_MAP[ev.type];
      var touches = getTouches.call(this, ev, type);
      if (!touches) {
        return;
      }

      this.callback(this.manager, type, {
        pointers: touches[0],
        changedPointers: touches[1],
        pointerType: INPUT_TYPE_TOUCH,
        srcEvent: ev
      });
    }
  }]);
  return TouchInput;
}(Input);

function getTouches(ev, type) {
  var allTouches = toArray$1(ev.touches);
  var targetIds = this.targetIds;

  // when there is only one touch, the process can be simplified

  if (type & (INPUT_START | INPUT_MOVE) && allTouches.length === 1) {
    targetIds[allTouches[0].identifier] = true;
    return [allTouches, allTouches];
  }

  var i = void 0;
  var targetTouches = void 0;
  var changedTouches = toArray$1(ev.changedTouches);
  var changedTargetTouches = [];
  var target = this.target;

  // get target touches from touches

  targetTouches = allTouches.filter(function (touch) {
    return hasParent(touch.target, target);
  });

  // collect touches
  if (type === INPUT_START) {
    i = 0;
    while (i < targetTouches.length) {
      targetIds[targetTouches[i].identifier] = true;
      i++;
    }
  }

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

    // cleanup removed touches
    if (type & (INPUT_END | INPUT_CANCEL)) {
      delete targetIds[changedTouches[i].identifier];
    }
    i++;
  }

  if (!changedTargetTouches.length) {
    return;
  }

  return [
  // merge targetTouches with changedTargetTouches so it contains ALL touches, including 'end' and 'cancel'
  uniqueArray(targetTouches.concat(changedTargetTouches), 'identifier', true), changedTargetTouches];
}

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

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

/**
 * @private
 * Mouse events input
 * @constructor
 * @extends Input
 */

var MouseInput = function (_Input) {
  inherits(MouseInput, _Input);

  function MouseInput() {
    classCallCheck(this, MouseInput);

    var _this = possibleConstructorReturn(this, (MouseInput.__proto__ || Object.getPrototypeOf(MouseInput)).apply(this, arguments));

    _this.evEl = MOUSE_ELEMENT_EVENTS;
    _this.evWin = MOUSE_WINDOW_EVENTS;

    _this.pressed = false; // mousedown state
    return _this;
  }

  /**
   * @private
   * handle mouse events
   * @param {Object} ev
   */


  createClass(MouseInput, [{
    key: 'handler',
    value: function handler(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
      if (!this.pressed) {
        return;
      }

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

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

/**
 * @private
 * 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
 */

var DEDUP_TIMEOUT = 2500;
var DEDUP_DISTANCE = 25;

var TouchMouseInput = function (_Input) {
  inherits(TouchMouseInput, _Input);

  function TouchMouseInput() {
    classCallCheck(this, TouchMouseInput);

    var _this = possibleConstructorReturn(this, (TouchMouseInput.__proto__ || Object.getPrototypeOf(TouchMouseInput)).apply(this, arguments));

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

    _this.primaryTouch = null;
    _this.lastTouches = [];
    return _this;
  }

  /**
   * @private
   * handle mouse and touch events
   * @param {Hammer} manager
   * @param {String} inputEvent
   * @param {Object} inputData
   */


  createClass(TouchMouseInput, [{
    key: 'handler',
    value: function handler(manager, inputEvent, inputData) {
      var isTouch = inputData.pointerType === INPUT_TYPE_TOUCH;
      var isMouse = inputData.pointerType === INPUT_TYPE_MOUSE;

      if (isMouse && inputData.sourceCapabilities && inputData.sourceCapabilities.firesTouchEvents) {
        return;
      }

      // when we're in a touch event, record touches to  de-dupe synthetic mouse event
      if (isTouch) {
        recordTouches.call(this, inputEvent, inputData);
      } else if (isMouse && isSyntheticEvent.call(this, inputData)) {
        return;
      }

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

    /**
     * @private
     * remove the event listeners
     */

  }, {
    key: 'destroy',
    value: function destroy() {
      this.touch.destroy();
      this.mouse.destroy();
    }
  }]);
  return TouchMouseInput;
}(Input);

function recordTouches(eventType, eventData) {
  if (eventType & INPUT_START) {
    this.primaryTouch = eventData.changedPointers[0].identifier;
    setLastTouch.call(this, eventData);
  } else if (eventType & (INPUT_END | INPUT_CANCEL)) {
    setLastTouch.call(this, eventData);
  }
}

function setLastTouch(eventData) {
  var _this2 = this;

  var _eventData$changedPoi = slicedToArray(eventData.changedPointers, 1);

  var touch = _eventData$changedPoi[0];

  if (touch.identifier === this.primaryTouch) {
    (function () {
      var lastTouch = { x: touch.clientX, y: touch.clientY };
      _this2.lastTouches.push(lastTouch);
      var lts = _this2.lastTouches;
      var removeLastTouch = function removeLastTouch() {
        var i = lts.indexOf(lastTouch);
        if (i > -1) {
          lts.splice(i, 1);
        }
      };
      setTimeout(removeLastTouch, DEDUP_TIMEOUT);
    })();
  }
}

function isSyntheticEvent(eventData) {
  var x = eventData.srcEvent.clientX;
  var y = eventData.srcEvent.clientY;
  for (var i = 0; i < this.lastTouches.length; i++) {
    var t = this.lastTouches[i];
    var dx = Math.abs(x - t.x);
    var dy = Math.abs(y - t.y);
    if (dx <= DEDUP_DISTANCE && dy <= DEDUP_DISTANCE) {
      return true;
    }
  }
  return false;
}

/**
 * @private
 * create new input type manager
 * called by the Manager constructor
 * @param {Hammer} manager
 * @returns {Input}
 */
function createInputInstance(manager) {
  var Type = void 0;
  // let inputClass = manager.options.inputClass;
  var inputClass = manager.options.inputClass;

  if (inputClass) {
    Type = inputClass;
  } else 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);
}

var STOP = 1;
var FORCED_STOP = 2;

/**
* @private
 * Manager
 * @param {HTMLElement} element
 * @param {Object} [options]
 * @constructor
 */

var Manager = function () {
  function Manager(element, options) {
    var _this = this;

    classCallCheck(this, Manager);

    this.options = assign$1({}, Hammer.defaults, options || {});

    this.options.inputTarget = this.options.inputTarget || element;

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

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

    toggleCssProps(this, true);

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

  /**
   * @private
   * set options
   * @param {Object} options
   * @returns {Manager}
   */


  createClass(Manager, [{
    key: 'set',
    value: function set(options) {
      assign$1(this.options, options);

      // Options that need a little more setup
      if (options.touchAction) {
        this.touchAction.update();
      }
      if (options.inputTarget) {
        // Clean up existing event listeners and reinitialize
        this.input.destroy();
        this.input.target = options.inputTarget;
        this.input.init();
      }
      return this;
    }

    /**
     * @private
     * 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]
     */

  }, {
    key: 'stop',
    value: function stop(force) {
      this.session.stopped = force ? FORCED_STOP : STOP;
    }

    /**
     * @private
     * 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
     */

  }, {
    key: 'recognize',
    value: function recognize(inputData) {
      var session = this.session;

      if (session.stopped) {
        return;
      }

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

      var recognizer = void 0;
      var recognizers = this.recognizers;

      // 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;
      }

      var i = 0;
      while (i < recognizers.length) {
        recognizer = 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 (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;
        }
        i++;
      }
    }

    /**
     * @private
     * get a recognizer by its event name.
     * @param {Recognizer|String} recognizer
     * @returns {Recognizer|Null}
     */

  }, {
    key: 'get',
    value: function get(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;
    }

    /**
     * @private add a recognizer to the manager
     * existing recognizers with the same event name will be removed
     * @param {Recognizer} recognizer
     * @returns {Recognizer|Manager}
     */

  }, {
    key: 'add',
    value: function add(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;
    }

    /**
     * @private
     * remove a recognizer by name or instance
     * @param {Recognizer|String} recognizer
     * @returns {Manager}
     */

  }, {
    key: 'remove',
    value: function remove(recognizer) {
      if (invokeArrayArg(recognizer, 'remove', this)) {
        return this;
      }

      recognizer = this.get(recognizer);

      // let's make sure this recognizer exists
      if (recognizer) {
        var recognizers = this.recognizers;

        var index = inArray(recognizers, recognizer);

        if (index !== -1) {
          recognizers.splice(index, 1);
          this.touchAction.update();
        }
      }

      return this;
    }

    /**
     * @private
     * bind event
     * @param {String} events
     * @param {Function} handler
     * @returns {EventEmitter} this
     */

  }, {
    key: 'on',
    value: function on(events, handler) {
      if (events === undefined) {
        return;
      }
      if (handler === undefined) {
        return;
      }

      var handlers = this.handlers;

      each(splitStr(events), function (event) {
        handlers[event] = handlers[event] || [];
        handlers[event].push(handler);
      });
      return this;
    }

    /**
     * @private unbind event, leave emit blank to remove all handlers
     * @param {String} events
     * @param {Function} [handler]
     * @returns {EventEmitter} this
     */

  }, {
    key: 'off',
    value: function off(events, handler) {
      if (events === undefined) {
        return;
      }

      var handlers = this.handlers;

      each(splitStr(events), function (event) {
        if (!handler) {
          delete handlers[event];
        } else {
          handlers[event] && handlers[event].splice(inArray(handlers[event], handler), 1);
        }
      });
      return this;
    }

    /**
     * @private emit event to the listeners
     * @param {String} event
     * @param {Object} data
     */

  }, {
    key: 'emit',
    value: function emit(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] && this.handlers[event].slice();
      if (!handlers || !handlers.length) {
        return;
      }

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

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

    /**
     * @private
     * destroy the manager and unbinds all events
     * it doesn't unbind dom events, that is the user own responsibility
     */

  }, {
    key: 'destroy',
    value: function destroy() {
      this.element && toggleCssProps(this, false);

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

function toggleCssProps(manager, add) {
  var element = manager.element;

  if (!element.style) {
    return;
  }
  var prop = void 0;
  each(manager.options.cssProps, function (value, name) {
    prop = prefixed(element.style, name);
    if (add) {
      manager.oldCssProps[prop] = element.style[prop];
      element.style[prop] = value;
    } else {
      element.style[prop] = manager.oldCssProps[prop] || '';
    }
  });
  if (!add) {
    manager.oldCssProps = {};
  }
}

/**
 * @private
 * 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);
}

/**
 * @private
 * Simple way to create a manager with a default set of recognizers.
 * @param {HTMLElement} element
 * @param {Object} [options]
 * @constructor
 */

var Hammer = function Hammer(element, options) {
  classCallCheck(this, Hammer);

  options = options || {};
  options.recognizers = ifUndefined(options.recognizers, Hammer.defaults.preset);
  return new Manager(element, options);
};

Hammer.VERSION = '2.0.8';

/**
 * @private
 * default settings
 * @namespace
 */
Hammer.defaults = {
  /**
   * @private
   * 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,

  /**
   * @private
   * 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,

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

  /**
   * @private
   * EXPERIMENTAL FEATURE -- can be removed/changed
   * Change the parent input target element.
   * If Null, then it is being set the to main element.
   * @type {Null|EventTarget}
   * @default null
   */
  inputTarget: null,

  /**
   * @private
   * force an input class
   * @type {Null|Function}
   * @default null
   */
  inputClass: null,

  /**
   * @private
   * 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]],

  /**
   * @private
   * 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: {
    /**
     * @private
     * Disables text selection to improve the dragging gesture. Mainly for desktop browsers.
     * @type {String}
     * @default 'none'
     */
    userSelect: 'none',

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

    /**
     * @private
     * 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',

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

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

    /**
     * @private
     * 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 SINGLE_TOUCH_INPUT_MAP = {
  touchstart: INPUT_START,
  touchmove: INPUT_MOVE,
  touchend: INPUT_END,
  touchcancel: INPUT_CANCEL
};

var SINGLE_TOUCH_TARGET_EVENTS = 'touchstart';
var SINGLE_TOUCH_WINDOW_EVENTS = 'touchstart touchmove touchend touchcancel';

/**
 * @private
 * Touch events input
 * @constructor
 * @extends Input
 */

var SingleTouchInput = function (_Input) {
  inherits(SingleTouchInput, _Input);

  function SingleTouchInput() {
    classCallCheck(this, SingleTouchInput);

    var _this = possibleConstructorReturn(this, (SingleTouchInput.__proto__ || Object.getPrototypeOf(SingleTouchInput)).apply(this, arguments));

    _this.evTarget = SINGLE_TOUCH_TARGET_EVENTS;
    _this.evWin = SINGLE_TOUCH_WINDOW_EVENTS;
    _this.started = false;

    Input.apply(_this, arguments);
    return _this;
  }

  createClass(SingleTouchInput, [{
    key: 'handler',
    value: function handler(ev) {
      var type = SINGLE_TOUCH_INPUT_MAP[ev.type];

      // should we handle the touch events?
      if (type === INPUT_START) {
        this.started = true;
      }

      if (!this.started) {
        return;
      }

      var touches = normalizeSingleTouches.call(this, ev, type);

      // when done, reset the started state
      if (type & (INPUT_END | INPUT_CANCEL) && touches[0].length - touches[1].length === 0) {
        this.started = false;
      }

      this.callback(this.manager, type, {
        pointers: touches[0],
        changedPointers: touches[1],
        pointerType: INPUT_TYPE_TOUCH,
        srcEvent: ev
      });
    }
  }]);
  return SingleTouchInput;
}(Input);

function normalizeSingleTouches(ev, type) {
  var all = toArray$1(ev.touches);
  var changed = toArray$1(ev.changedTouches);

  if (type & (INPUT_END | INPUT_CANCEL)) {
    all = uniqueArray(all.concat(changed), 'identifier', true);
  }

  return [all, changed];
}

/**
 * @private
 * wrap a method with a deprecation warning and stack trace
 * @param {Function} method
 * @param {String} name
 * @param {String} message
 * @returns {Function} A new function wrapping the supplied method.
 */
function deprecate(method, name, message) {
  var deprecationMessage = 'DEPRECATED METHOD: ' + name + '\n' + message + ' AT \n';
  return function () {
    var e = new Error('get-stack-trace');
    var stack = e && e.stack ? e.stack.replace(/^[^\(]+?[\n$]/gm, '').replace(/^\s+at\s+/gm, '').replace(/^Object.<anonymous>\s*\(/gm, '{anonymous}()@') : 'Unknown Stack Trace';

    var log = window.console && (window.console.warn || window.console.log);
    if (log) {
      log.call(window.console, deprecationMessage, stack);
    }
    return method.apply(this, arguments);
  };
}

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

/**
 * @private
 * 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
 */
var merge = deprecate(function (dest, src) {
  return extend(dest, src, true);
}, 'merge', 'Use `assign`.');

/**
 * @private
 * simple class inheritance
 * @param {Function} child
 * @param {Function} base
 * @param {Object} [properties]
 */
function inherit(child, base, properties) {
  var baseP = base.prototype;
  var childP = void 0;

  childP = child.prototype = Object.create(baseP);
  childP.constructor = child;
  childP._super = baseP;

  if (properties) {
    assign$1(childP, properties);
  }
}

// this prevents errors when Hammer is loaded in the presence of an AMD
//  style loader but by script tag, not by the loader.

assign$1(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,

  TouchInput: TouchInput,
  MouseInput: MouseInput,
  PointerEventInput: PointerEventInput,
  TouchMouseInput: TouchMouseInput,
  SingleTouchInput: SingleTouchInput,

  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,
  assign: assign$1,
  inherit: inherit,
  bindFn: bindFn,
  prefixed: prefixed,
  toArray: toArray$1,
  inArray: inArray,
  uniqueArray: uniqueArray,
  splitStr: splitStr,
  boolOrFn: boolOrFn,
  hasParent: hasParent,
  addEventListeners: addEventListeners,
  removeEventListeners: removeEventListeners
});

/* jshint ignore:start */
if (typeof define === 'function' && define.amd) {
  define(function () {
    return Hammer;
  });
} else if (typeof module !== 'undefined' && module.exports) {
  module.exports = Hammer;
} else {
  window[exportName] = Hammer;
}
/* jshint ignore:end */
})(window, document, 'Hammer');