/*

YUI 3.10.3 (build 2fb5187)

Copyright 2013 Yahoo! Inc. All rights reserved.

Licensed under the BSD License.

http://yuilibrary.com/license/

*/

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

/**

 * Define new DOM events that can be subscribed to from Nodes.

 *

 * @module event

 * @submodule event-synthetic

 */

var CustomEvent = Y.CustomEvent,

    DOMMap   = Y.Env.evt.dom_map,

    toArray  = Y.Array,

    YLang    = Y.Lang,

    isObject = YLang.isObject,

    isString = YLang.isString,

    isArray  = YLang.isArray,

    query    = Y.Selector.query,

    noop     = function () {};

/**

 * <p>The triggering mechanism used by SyntheticEvents.</p>

 *

 * <p>Implementers should not instantiate these directly.  Use the Notifier

 * provided to the event's implemented <code>on(node, sub, notifier)</code> or

 * <code>delegate(node, sub, notifier, filter)</code> methods.</p>

 *

 * @class SyntheticEvent.Notifier

 * @constructor

 * @param handle {EventHandle} the detach handle for the subscription to an

 *              internal custom event used to execute the callback passed to

 *              on(..) or delegate(..)

 * @param emitFacade {Boolean} take steps to ensure the first arg received by

 *              the subscription callback is an event facade

 * @private

 * @since 3.2.0

 */

function Notifier(handle, emitFacade) {

    this.handle     = handle;

    this.emitFacade = emitFacade;

}

/**

 * <p>Executes the subscription callback, passing the firing arguments as the

 * first parameters to that callback. For events that are configured with

 * emitFacade=true, it is common practice to pass the triggering DOMEventFacade

 * as the first parameter.  Barring a proper DOMEventFacade or EventFacade

 * (from a CustomEvent), a new EventFacade will be generated.  In that case, if

 * fire() is called with a simple object, it will be mixed into the facade.

 * Otherwise, the facade will be prepended to the callback parameters.</p>

 *

 * <p>For notifiers provided to delegate logic, the first argument should be an

 * object with a "currentTarget" property to identify what object to

 * default as 'this' in the callback.  Typically this is gleaned from the

 * DOMEventFacade or EventFacade, but if configured with emitFacade=false, an

 * object must be provided.  In that case, the object will be removed from the

 * callback parameters.</p>

 *

 * <p>Additional arguments passed during event subscription will be

 * automatically added after those passed to fire().</p>

 *

 * @method fire

 * @param e {EventFacade|DOMEventFacade|Object|any} (see description)

 * @param arg* {any} additional arguments received by all subscriptions

 * @private

 */

Notifier.prototype.fire = function (e) {

    // first arg to delegate notifier should be an object with currentTarget

    var args     = toArray(arguments, 0, true),

        handle   = this.handle,

        ce       = handle.evt,

        sub      = handle.sub,

        thisObj  = sub.context,

        delegate = sub.filter,

        event    = e || {},

        ret;

    if (this.emitFacade) {

        if (!e || !e.preventDefault) {

            event = ce._getFacade();

            if (isObject(e) && !e.preventDefault) {

                Y.mix(event, e, true);

                args[0] = event;

            } else {

                args.unshift(event);

            }

        }

        event.type    = ce.type;

        event.details = args.slice();

        if (delegate) {

            event.container = ce.host;

        }

    } else if (delegate && isObject(e) && e.currentTarget) {

        args.shift();

    }

    sub.context = thisObj || event.currentTarget || ce.host;

    ret = ce.fire.apply(ce, args);

    sub.context = thisObj; // reset for future firing

    // to capture callbacks that return false to stopPropagation.

    // Useful for delegate implementations

    return ret;

};

/**

 * Manager object for synthetic event subscriptions to aggregate multiple synths on the

 * same node without colliding with actual DOM subscription entries in the global map of

 * DOM subscriptions.  Also facilitates proper cleanup on page unload.

 *

 * @class SynthRegistry

 * @constructor

 * @param el {HTMLElement} the DOM element

 * @param yuid {String} the yuid stamp for the element

 * @param key {String} the generated id token used to identify an event type +

 *                     element in the global DOM subscription map.

 * @private

 */

function SynthRegistry(el, yuid, key) {

    this.handles = [];

    this.el      = el;

    this.key     = key;

    this.domkey  = yuid;

}

SynthRegistry.prototype = {

    constructor: SynthRegistry,

    // A few object properties to fake the CustomEvent interface for page

    // unload cleanup.  DON'T TOUCH!

    type      : '_synth',

    fn        : noop,

    capture   : false,

    /**

     * Adds a subscription from the Notifier registry.

     *

     * @method register

     * @param handle {EventHandle} the subscription

     * @since 3.4.0

     */

    register: function (handle) {

        handle.evt.registry = this;

        this.handles.push(handle);

    },

    /**

     * Removes the subscription from the Notifier registry.

     *

     * @method _unregisterSub

     * @param sub {Subscription} the subscription

     * @since 3.4.0

     */

    unregister: function (sub) {

        var handles = this.handles,

            events = DOMMap[this.domkey],

            i;

        for (i = handles.length - 1; i >= 0; --i) {

            if (handles[i].sub === sub) {

                handles.splice(i, 1);

                break;

            }

        }

        // Clean up left over objects when there are no more subscribers.

        if (!handles.length) {

            delete events[this.key];

            if (!Y.Object.size(events)) {

                delete DOMMap[this.domkey];

            }

        }

    },

    /**

     * Used by the event system's unload cleanup process.  When navigating

     * away from the page, the event system iterates the global map of element

     * subscriptions and detaches everything using detachAll().  Normally,

     * the map is populated with custom events, so this object needs to

     * at least support the detachAll method to duck type its way to

     * cleanliness.

     *

     * @method detachAll

     * @private

     * @since 3.4.0

     */

    detachAll : function () {

        var handles = this.handles,

            i = handles.length;

        while (--i >= 0) {

            handles[i].detach();

        }

    }

};

/**

 * <p>Wrapper class for the integration of new events into the YUI event

 * infrastructure.  Don't instantiate this object directly, use

 * <code>Y.Event.define(type, config)</code>.  See that method for details.</p>

 *

 * <p>Properties that MAY or SHOULD be specified in the configuration are noted

 * below and in the description of <code>Y.Event.define</code>.</p>

 *

 * @class SyntheticEvent

 * @constructor

 * @param cfg {Object} Implementation pieces and configuration

 * @since 3.1.0

 * @in event-synthetic

 */

function SyntheticEvent() {

    this._init.apply(this, arguments);

}

Y.mix(SyntheticEvent, {

    Notifier: Notifier,

    SynthRegistry: SynthRegistry,

    /**

     * Returns the array of subscription handles for a node for the given event

     * type.  Passing true as the third argument will create a registry entry

     * in the event system's DOM map to host the array if one doesn't yet exist.

     *

     * @method getRegistry

     * @param node {Node} the node

     * @param type {String} the event

     * @param create {Boolean} create a registration entry to host a new array

     *                  if one doesn't exist.

     * @return {Array}

     * @static

     * @protected

     * @since 3.2.0

     */

    getRegistry: function (node, type, create) {

        var el     = node._node,

            yuid   = Y.stamp(el),

            key    = 'event:' + yuid + type + '_synth',

            events = DOMMap[yuid];

        if (create) {

            if (!events) {

                events = DOMMap[yuid] = {};

            }

            if (!events[key]) {

                events[key] = new SynthRegistry(el, yuid, key);

            }

        }

        return (events && events[key]) || null;

    },

    /**

     * Alternate <code>_delete()</code> method for the CustomEvent object

     * created to manage SyntheticEvent subscriptions.

     *

     * @method _deleteSub

     * @param sub {Subscription} the subscription to clean up

     * @private

     * @since 3.2.0

     */

    _deleteSub: function (sub) {

        if (sub && sub.fn) {

            var synth = this.eventDef,

                method = (sub.filter) ? 'detachDelegate' : 'detach';

            this._subscribers = [];

            if (CustomEvent.keepDeprecatedSubs) {

                this.subscribers = {};

            }

            synth[method](sub.node, sub, this.notifier, sub.filter);

            this.registry.unregister(sub);

            delete sub.fn;

            delete sub.node;

            delete sub.context;

        }

    },

    prototype: {

        constructor: SyntheticEvent,

        /**

         * Construction logic for the event.

         *

         * @method _init

         * @protected

         */

        _init: function () {

            var config = this.publishConfig || (this.publishConfig = {});

            // The notification mechanism handles facade creation

            this.emitFacade = ('emitFacade' in config) ?

                                config.emitFacade :

                                true;

            config.emitFacade  = false;

        },

        /**

         * <p>Implementers MAY provide this method definition.</p>

         *

         * <p>Implement this function if the event supports a different

         * subscription signature.  This function is used by both

         * <code>on()</code> and <code>delegate()</code>.  The second parameter

         * indicates that the event is being subscribed via

         * <code>delegate()</code>.</p>

         *

         * <p>Implementations must remove extra arguments from the args list

         * before returning.  The required args for <code>on()</code>

         * subscriptions are</p>

         * <pre><code>[type, callback, target, context, argN...]</code></pre>

         *

         * <p>The required args for <code>delegate()</code>

         * subscriptions are</p>

         *

         * <pre><code>[type, callback, target, filter, context, argN...]</code></pre>

         *

         * <p>The return value from this function will be stored on the

         * subscription in the '_extra' property for reference elsewhere.</p>

         *

         * @method processArgs

         * @param args {Array} parmeters passed to Y.on(..) or Y.delegate(..)

         * @param delegate {Boolean} true if the subscription is from Y.delegate

         * @return {any}

         */

        processArgs: noop,

        /**

         * <p>Implementers MAY override this property.</p>

         *

         * <p>Whether to prevent multiple subscriptions to this event that are

         * classified as being the same.  By default, this means the subscribed

         * callback is the same function.  See the <code>subMatch</code>

         * method.  Setting this to true will impact performance for high volume

         * events.</p>

         *

         * @property preventDups

         * @type {Boolean}

         * @default false

         */

        //preventDups  : false,

        /**

         * <p>Implementers SHOULD provide this method definition.</p>

         *

         * Implementation logic for subscriptions done via <code>node.on(type,

         * fn)</code> or <code>Y.on(type, fn, target)</code>.  This

         * function should set up the monitor(s) that will eventually fire the

         * event.  Typically this involves subscribing to at least one DOM

         * event.  It is recommended to store detach handles from any DOM

         * subscriptions to make for easy cleanup in the <code>detach</code>

         * method.  Typically these handles are added to the <code>sub</code>

         * object.  Also for SyntheticEvents that leverage a single DOM

         * subscription under the hood, it is recommended to pass the DOM event

         * object to <code>notifier.fire(e)</code>.  (The event name on the

         * object will be updated).

         *

         * @method on

         * @param node {Node} the node the subscription is being applied to

         * @param sub {Subscription} the object to track this subscription

         * @param notifier {SyntheticEvent.Notifier} call notifier.fire(..) to

         *              trigger the execution of the subscribers

         */

        on: noop,

        /**

         * <p>Implementers SHOULD provide this method definition.</p>

         *

         * <p>Implementation logic for detaching subscriptions done via

         * <code>node.on(type, fn)</code>.  This function should clean up any

         * subscriptions made in the <code>on()</code> phase.</p>

         *

         * @method detach

         * @param node {Node} the node the subscription was applied to

         * @param sub {Subscription} the object tracking this subscription

         * @param notifier {SyntheticEvent.Notifier} the Notifier used to

         *              trigger the execution of the subscribers

         */

        detach: noop,

        /**

         * <p>Implementers SHOULD provide this method definition.</p>

         *

         * <p>Implementation logic for subscriptions done via

         * <code>node.delegate(type, fn, filter)</code> or

         * <code>Y.delegate(type, fn, container, filter)</code>.  Like with

         * <code>on()</code> above, this function should monitor the environment

         * for the event being fired, and trigger subscription execution by

         * calling <code>notifier.fire(e)</code>.</p>

         *

         * <p>This function receives a fourth argument, which is the filter

         * used to identify which Node's are of interest to the subscription.

         * The filter will be either a boolean function that accepts a target

         * Node for each hierarchy level as the event bubbles, or a selector

         * string.  To translate selector strings into filter functions, use

         * <code>Y.delegate.compileFilter(filter)</code>.</p>

         *

         * @method delegate

         * @param node {Node} the node the subscription is being applied to

         * @param sub {Subscription} the object to track this subscription

         * @param notifier {SyntheticEvent.Notifier} call notifier.fire(..) to

         *              trigger the execution of the subscribers

         * @param filter {String|Function} Selector string or function that

         *              accepts an event object and returns null, a Node, or an

         *              array of Nodes matching the criteria for processing.

         * @since 3.2.0

         */

        delegate       : noop,

        /**

         * <p>Implementers SHOULD provide this method definition.</p>

         *

         * <p>Implementation logic for detaching subscriptions done via

         * <code>node.delegate(type, fn, filter)</code> or

         * <code>Y.delegate(type, fn, container, filter)</code>.  This function

         * should clean up any subscriptions made in the

         * <code>delegate()</code> phase.</p>

         *

         * @method detachDelegate

         * @param node {Node} the node the subscription was applied to

         * @param sub {Subscription} the object tracking this subscription