# Yahoo! UI Library

### event 3.3.0

Yahoo! UI Library > event > event-facade-dom-touch.js (source view)
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    /**
     * Adds touch event facade normalization properties (touches, changedTouches, targetTouches etc.) to the DOM event facade
     *
     * @module event-touch
     */

    var SCALE = "scale",
        ROTATION = "rotation",
        IDENTIFIER = "identifier";

    /**
     * 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 {Event.Custom} 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);

        if (e.touches) {
            Y.log("Found e.touches. Replicating on facade");

            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");

            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"); }
            }
        }

        if (e.changedTouches) {
            Y.log("Found e.changedTouches. Replicating on facade");

            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"); }
            }
        }

        if (SCALE in e) {
            this[SCALE] = e[SCALE];
        }

        if (ROTATION in e) {
            this[ROTATION] = e[ROTATION];
        }

        if (IDENTIFIER in e) {
            this[IDENTIFIER] = e[IDENTIFIER];
        }
    };

    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
        });
    }

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