YUI.add('event-touch', function (Y, NAME) {

/**

Adds touch event facade normalization properties (touches, changedTouches, targetTouches etc.) to the DOM event facade. Adds

touch events to the DOM events whitelist.

@example

    YUI().use('event-touch', function (Y) {

        Y.one('#myDiv').on('touchstart', function(e) {

            ...

        });

    });

@module event

@submodule event-touch

 */

var SCALE = "scale",

    ROTATION = "rotation",

    IDENTIFIER = "identifier",

    win = Y.config.win,

    GESTURE_MAP = {};

/**

 * Adds touch event facade normalization properties to the DOM event facade

 *

 * @method _touch

 * @for DOMEventFacade

 * @private

 * @param ev {Event} the DOM event

 * @param currentTarget {HTMLElement} the element the listener was attached to

 * @param wrapper {CustomEvent} the custom event wrapper for this DOM event

 */

Y.DOMEventFacade.prototype._touch = function(e, currentTarget, wrapper) {

    var i,l, etCached, et,touchCache;

    Y.log("Calling facade._touch() with e = " + e, "debug", "event-touch");

    if (e.touches) {

        Y.log("Found e.touches. Replicating on facade", "info", "event-touch");

        /**

         * Array of individual touch events for touch points that are still in

         * contact with the touch surface.

         *

         * @property touches

         * @type {DOMEventFacade[]}

         */

        this.touches = [];

        touchCache = {};

        for (i = 0, l = e.touches.length; i < l; ++i) {

            et = e.touches[i];

            touchCache[Y.stamp(et)] = this.touches[i] = new Y.DOMEventFacade(et, currentTarget, wrapper);

        }

    }

    if (e.targetTouches) {

        Y.log("Found e.targetTouches. Replicating on facade", "info", "event-touch");

        /**

         * Array of individual touch events still in contact with the touch

         * surface and whose `touchstart` event occurred inside the same taregt

         * element as the current target element.

         *

         * @property targetTouches

         * @type {DOMEventFacade[]}

         */

        this.targetTouches = [];

        for (i = 0, l = e.targetTouches.length; i < l; ++i) {

            et = e.targetTouches[i];

            etCached = touchCache && touchCache[Y.stamp(et, true)];

            this.targetTouches[i] = etCached || new Y.DOMEventFacade(et, currentTarget, wrapper);

            if (etCached) { Y.log("Found native event in touches. Using same facade in targetTouches", "info", "event-touch"); }

        }

    }

    if (e.changedTouches) {

        Y.log("Found e.changedTouches. Replicating on facade", "info", "event-touch");

        /**

        An array of event-specific touch events.

        For `touchstart`, the touch points that became active with the current

        event.

        For `touchmove`, the touch points that have changed since the last

        event.

        For `touchend`, the touch points that have been removed from the touch

        surface.

        @property changedTouches

        @type {DOMEventFacade[]}

        **/

        this.changedTouches = [];

        for (i = 0, l = e.changedTouches.length; i < l; ++i) {

            et = e.changedTouches[i];

            etCached = touchCache && touchCache[Y.stamp(et, true)];

            this.changedTouches[i] = etCached || new Y.DOMEventFacade(et, currentTarget, wrapper);

            if (etCached) { Y.log("Found native event in touches. Using same facade in changedTouches", "info", "event-touch"); }

        }

    }

    if (SCALE in e) {

        this[SCALE] = e[SCALE];

    }

    if (ROTATION in e) {

        this[ROTATION] = e[ROTATION];

    }

    if (IDENTIFIER in e) {

        this[IDENTIFIER] = e[IDENTIFIER];

    }

};

//Adding MSPointer events to whitelisted DOM Events. MSPointer event payloads

//have the same properties as mouse events.

if (Y.Node.DOM_EVENTS) {

    Y.mix(Y.Node.DOM_EVENTS, {

        touchstart:1,

        touchmove:1,

        touchend:1,

        touchcancel:1,

        gesturestart:1,

        gesturechange:1,

        gestureend:1,

        MSPointerDown:1,

        MSPointerUp:1,

        MSPointerMove:1,

        MSPointerCancel:1,

        pointerdown:1,

        pointerup:1,

        pointermove:1,

        pointercancel:1

    });

}

//Add properties to Y.EVENT.GESTURE_MAP based on feature detection.

if ((win && ("ontouchstart" in win)) && !(Y.UA.chrome && Y.UA.chrome < 6)) {

    GESTURE_MAP.start = ["touchstart", "mousedown"];

    GESTURE_MAP.end = ["touchend", "mouseup"];

    GESTURE_MAP.move = ["touchmove", "mousemove"];

    GESTURE_MAP.cancel = ["touchcancel", "mousecancel"];

}

else if (win && win.PointerEvent) {

    GESTURE_MAP.start = "pointerdown";

    GESTURE_MAP.end = "pointerup";

    GESTURE_MAP.move = "pointermove";

    GESTURE_MAP.cancel = "pointercancel";

}

else if (win && ("msPointerEnabled" in win.navigator)) {

    GESTURE_MAP.start = "MSPointerDown";

    GESTURE_MAP.end = "MSPointerUp";

    GESTURE_MAP.move = "MSPointerMove";

    GESTURE_MAP.cancel = "MSPointerCancel";

}

else {

    GESTURE_MAP.start = "mousedown";

    GESTURE_MAP.end = "mouseup";

    GESTURE_MAP.move = "mousemove";

    GESTURE_MAP.cancel = "mousecancel";

}

/**

 * A object literal with keys "start", "end", and "move". The value for each key is a

 * string representing the event for that environment. For touch environments, the respective

 * values are "touchstart", "touchend" and "touchmove". Mouse and MSPointer environments are also

 * supported via feature detection.

 *

 * @property _GESTURE_MAP

 * @type Object

 * @static

 */

Y.Event._GESTURE_MAP = GESTURE_MAP;

}, '@VERSION@', {"requires": ["node-base"]});