Proyectos de Subversion Moodle

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

/*

 * DOM event listener abstraction layer

 * @module event

 * @submodule event-base

 */

/**

 * The domready event fires at the moment the browser's DOM is

 * usable. In most cases, this is before images are fully

 * downloaded, allowing you to provide a more responsive user

 * interface.

 *

 * In YUI 3, domready subscribers will be notified immediately if

 * that moment has already passed when the subscription is created.

 *

 * One exception is if the yui.js file is dynamically injected into

 * the page.  If this is done, you must tell the YUI instance that

 * you did this in order for DOMReady (and window load events) to

 * fire normally.  That configuration option is 'injected' -- set

 * it to true if the yui.js script is not included inline.

 *

 * This method is part of the 'event-ready' module, which is a

 * submodule of 'event'.

 *

 * @event domready

 * @for YUI

 */

Y.publish('domready', {

    fireOnce: true,

    async: true

});

if (YUI.Env.DOMReady) {

    Y.fire('domready');

} else {

    Y.Do.before(function() { Y.fire('domready'); }, YUI.Env, '_ready');

}

/**

 * Custom event engine, DOM event listener abstraction layer, synthetic DOM

 * events.

 * @module event

 * @submodule event-base

 */

/**

 * Wraps a DOM event, properties requiring browser abstraction are

 * fixed here.  Provids a security layer when required.

 * @class DOMEventFacade

 * @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

 */

    var ua = Y.UA,

    EMPTY = {},

    /**

     * webkit key remapping required for Safari < 3.1

     * @property webkitKeymap

     * @private

     */

    webkitKeymap = {

        63232: 38, // up

        63233: 40, // down

        63234: 37, // left

        63235: 39, // right

        63276: 33, // page up

        63277: 34, // page down

        25:     9, // SHIFT-TAB (Safari provides a different key code in

                   // this case, even though the shiftKey modifier is set)

        63272: 46, // delete

        63273: 36, // home

        63275: 35  // end

    },

    /**

     * Returns a wrapped node.  Intended to be used on event targets,

     * so it will return the node's parent if the target is a text

     * node.

     *

     * If accessing a property of the node throws an error, this is

     * probably the anonymous div wrapper Gecko adds inside text

     * nodes.  This likely will only occur when attempting to access

     * the relatedTarget.  In this case, we now return null because

     * the anonymous div is completely useless and we do not know

     * what the related target was because we can't even get to

     * the element's parent node.

     *

     * @method resolve

     * @private

     */

    resolve = function(n) {

        if (!n) {

            return n;

        }

        try {

            if (n && 3 == n.nodeType) {

                n = n.parentNode;

            }

        } catch(e) {

            return null;

        }

        return Y.one(n);

    },

    DOMEventFacade = function(ev, currentTarget, wrapper) {

        this._event = ev;

        this._currentTarget = currentTarget;

        this._wrapper = wrapper || EMPTY;

        // if not lazy init

        this.init();

    };

Y.extend(DOMEventFacade, Object, {

    init: function() {

        var e = this._event,

            overrides = this._wrapper.overrides,

            x = e.pageX,

            y = e.pageY,

            c,

            currentTarget = this._currentTarget;

        this.altKey   = e.altKey;

        this.ctrlKey  = e.ctrlKey;

        this.metaKey  = e.metaKey;

        this.shiftKey = e.shiftKey;

        this.type     = (overrides && overrides.type) || e.type;

        this.clientX  = e.clientX;

        this.clientY  = e.clientY;

        this.pageX = x;

        this.pageY = y;

        // charCode is unknown in keyup, keydown. keyCode is unknown in keypress.

        // FF 3.6 - 8+? pass 0 for keyCode in keypress events.

        // Webkit, FF 3.6-8+?, and IE9+? pass 0 for charCode in keydown, keyup.

        // Webkit and IE9+? duplicate charCode in keyCode.

        // Opera never sets charCode, always keyCode (though with the charCode).

        // IE6-8 don't set charCode or which.

        // All browsers other than IE6-8 set which=keyCode in keydown, keyup, and

        // which=charCode in keypress.

        //

        // Moral of the story: (e.which || e.keyCode) will always return the

        // known code for that key event phase. e.keyCode is often different in

        // keypress from keydown and keyup.

        c = e.keyCode || e.charCode;

        if (ua.webkit && (c in webkitKeymap)) {

            c = webkitKeymap[c];

        }

        this.keyCode = c;

        this.charCode = c;

        // Fill in e.which for IE - implementers should always use this over

        // e.keyCode or e.charCode.

        this.which = e.which || e.charCode || c;

        // this.button = e.button;

        this.button = this.which;

        this.target = resolve(e.target);

        this.currentTarget = resolve(currentTarget);

        this.relatedTarget = resolve(e.relatedTarget);

        if (e.type == "mousewheel" || e.type == "DOMMouseScroll") {

            this.wheelDelta = (e.detail) ? (e.detail * -1) : Math.round(e.wheelDelta / 80) || ((e.wheelDelta < 0) ? -1 : 1);

        }

        if (this._touch) {

            this._touch(e, currentTarget, this._wrapper);

        }

    },

    stopPropagation: function() {

        this._event.stopPropagation();

        this._wrapper.stopped = 1;

        this.stopped = 1;

    },

    stopImmediatePropagation: function() {

        var e = this._event;

        if (e.stopImmediatePropagation) {

            e.stopImmediatePropagation();

        } else {

            this.stopPropagation();

        }

        this._wrapper.stopped = 2;

        this.stopped = 2;

    },

    preventDefault: function(returnValue) {

        var e = this._event;

        e.preventDefault();

        if (returnValue) {

            e.returnValue = returnValue;

        }

        this._wrapper.prevented = 1;

        this.prevented = 1;

    },

    halt: function(immediate) {

        if (immediate) {

            this.stopImmediatePropagation();

        } else {

            this.stopPropagation();

        }

        this.preventDefault();

    }

});

DOMEventFacade.resolve = resolve;

Y.DOM2EventFacade = DOMEventFacade;

Y.DOMEventFacade = DOMEventFacade;

    /**

     * The native event

     * @property _event

     * @type {DOMEvent}

     * @private

     */

    /**

    The name of the event (e.g. "click")

    @property type

    @type {String}

    **/

    /**

    `true` if the "alt" or "option" key is pressed.

    @property altKey

    @type {Boolean}

    **/

    /**

    `true` if the shift key is pressed.

    @property shiftKey

    @type {Boolean}

    **/

    /**

    `true` if the "Windows" key on a Windows keyboard, "command" key on an

    Apple keyboard, or "meta" key on other keyboards is pressed.

    @property metaKey

    @type {Boolean}

    **/

    /**

    `true` if the "Ctrl" or "control" key is pressed.

    @property ctrlKey

    @type {Boolean}

    **/

    /**

     * The X location of the event on the page (including scroll)

     * @property pageX

     * @type {Number}

     */

    /**

     * The Y location of the event on the page (including scroll)

     * @property pageY

     * @type {Number}

     */

    /**

     * The X location of the event in the viewport

     * @property clientX

     * @type {Number}

     */

    /**

     * The Y location of the event in the viewport

     * @property clientY

     * @type {Number}

     */

    /**

     * The keyCode for key events.  Uses charCode if keyCode is not available

     * @property keyCode

     * @type {Number}

     */

    /**

     * The charCode for key events.  Same as keyCode

     * @property charCode

     * @type {Number}

     */

    /**

     * The button that was pushed. 1 for left click, 2 for middle click, 3 for

     * right click.  This is only reliably populated on `mouseup` events.

     * @property button

     * @type {Number}

     */

    /**

     * The button that was pushed.  Same as button.

     * @property which

     * @type {Number}

     */

    /**

     * Node reference for the targeted element

     * @property target

     * @type {Node}

     */

    /**

     * Node reference for the element that the listener was attached to.

     * @property currentTarget

     * @type {Node}

     */

    /**

     * Node reference to the relatedTarget

     * @property relatedTarget

     * @type {Node}

     */

    /**

     * Number representing the direction and velocity of the movement of the mousewheel.

     * Negative is down, the higher the number, the faster.  Applies to the mousewheel event.

     * @property wheelDelta

     * @type {Number}

     */

    /**

     * Stops the propagation to the next bubble target

     * @method stopPropagation

     */

    /**

     * Stops the propagation to the next bubble target and

     * prevents any additional listeners from being exectued

     * on the current target.

     * @method stopImmediatePropagation

     */

    /**

     * Prevents the event's default behavior

     * @method preventDefault

     * @param returnValue {string} sets the returnValue of the event to this value

     * (rather than the default false value).  This can be used to add a customized

     * confirmation query to the beforeunload event).

     */

    /**

     * Stops the event propagation and prevents the default

     * event behavior.

     * @method halt

     * @param immediate {boolean} if true additional listeners

     * on the current target will not be executed

     */

(function() {

/**

 * The event utility provides functions to add and remove event listeners,

 * event cleansing.  It also tries to automatically remove listeners it

 * registers during the unload event.

 * @module event

 * @main event

 * @submodule event-base

 */

/**

 * The event utility provides functions to add and remove event listeners,

 * event cleansing.  It also tries to automatically remove listeners it

 * registers during the unload event.

 *

 * @class Event

 * @static

 */

Y.Env.evt.dom_wrappers = {};

Y.Env.evt.dom_map = {};

var _eventenv = Y.Env.evt,

    config = Y.config,

    win = config.win,

    add = YUI.Env.add,

    remove = YUI.Env.remove,

    onLoad = function() {

        YUI.Env.windowLoaded = true;

        Y.Event._load();

        remove(win, "load", onLoad);

    },

    onUnload = function() {

        Y.Event._unload();

    },

    EVENT_READY = 'domready',

    COMPAT_ARG = '~yui|2|compat~',

    shouldIterate = function(o) {

        try {

            // TODO: See if there's a more performant way to return true early on this, for the common case

            return (o && typeof o !== "string" && Y.Lang.isNumber(o.length) && !o.tagName && !Y.DOM.isWindow(o));

        } catch(ex) {

            Y.log("collection check failure", "warn", "event");

            return false;

        }

    },

    // aliases to support DOM event subscription clean up when the last

    // subscriber is detached. deleteAndClean overrides the DOM event's wrapper

    // CustomEvent _delete method.

    _ceProtoDelete = Y.CustomEvent.prototype._delete,

    _deleteAndClean = function(s) {

        var ret = _ceProtoDelete.apply(this, arguments);

        if (!this.hasSubs()) {

            Y.Event._clean(this);

        }

        return ret;

    },

Event = function() {

    /**

     * True after the onload event has fired

     * @property _loadComplete

     * @type boolean

     * @static

     * @private

     */

    var _loadComplete =  false,

    /**

     * The number of times to poll after window.onload.  This number is

     * increased if additional late-bound handlers are requested after

     * the page load.

     * @property _retryCount

     * @static

     * @private

     */

    _retryCount = 0,

    /**

     * onAvailable listeners

     * @property _avail

     * @static

     * @private

     */

    _avail = [],

    /**

     * Custom event wrappers for DOM events.  Key is

     * 'event:' + Element uid stamp + event type

     * @property _wrappers

     * @type CustomEvent

     * @static

     * @private

     */

    _wrappers = _eventenv.dom_wrappers,

    _windowLoadKey = null,

    /**

     * Custom event wrapper map DOM events.  Key is

     * Element uid stamp.  Each item is a hash of custom event

     * wrappers as provided in the _wrappers collection.  This

     * provides the infrastructure for getListeners.

     * @property _el_events

     * @static

     * @private

     */

    _el_events = _eventenv.dom_map;

    return {

        /**

         * The number of times we should look for elements that are not

         * in the DOM at the time the event is requested after the document

         * has been loaded.  The default is 1000@amp;40 ms, so it will poll

         * for 40 seconds or until all outstanding handlers are bound

         * (whichever comes first).

         * @property POLL_RETRYS

         * @type int

         * @static

         * @final

         */

        POLL_RETRYS: 1000,

        /**

         * The poll interval in milliseconds

         * @property POLL_INTERVAL

         * @type int

         * @static

         * @final

         */

        POLL_INTERVAL: 40,

        /**

         * addListener/removeListener can throw errors in unexpected scenarios.

         * These errors are suppressed, the method returns false, and this property

         * is set

         * @property lastError

         * @static

         * @type Error

         */

        lastError: null,

        /**

         * poll handle

         * @property _interval

         * @static

         * @private

         */

        _interval: null,

        /**

         * document readystate poll handle

         * @property _dri

         * @static

         * @private

         */

         _dri: null,

        /**

         * True when the document is initially usable

         * @property DOMReady

         * @type boolean

         * @static

         */

        DOMReady: false,

        /**

         * @method startInterval

         * @static

         * @private

         */

        startInterval: function() {

            if (!Event._interval) {

Event._interval = setInterval(Event._poll, Event.POLL_INTERVAL);

            }

        },

        /**

         * Executes the supplied callback when the item with the supplied

         * id is found.  This is meant to be used to execute behavior as

         * soon as possible as the page loads.  If you use this after the

         * initial page load it will poll for a fixed time for the element.

         * The number of times it will poll and the frequency are

         * configurable.  By default it will poll for 10 seconds.

         *

         * <p>The callback is executed with a single parameter:

         * the custom object parameter, if provided.</p>

         *

         * @method onAvailable

         *

         * @param {string||string[]}   id the id of the element, or an array

         * of ids to look for.

         * @param {function} fn what to execute when the element is found.

         * @param {object}   p_obj an optional object to be passed back as

         *                   a parameter to fn.

         * @param {boolean|object}  p_override If set to true, fn will execute

         *                   in the context of p_obj, if set to an object it

         *                   will execute in the context of that object

         * @param checkContent {boolean} check child node readiness (onContentReady)

         * @static

         * @deprecated Use Y.on("available")

         */

        // @TODO fix arguments

        onAvailable: function(id, fn, p_obj, p_override, checkContent, compat) {

            var a = Y.Array(id), i, availHandle;

            for (i=0; i<a.length; i=i+1) {

                _avail.push({

                    id:         a[i],

                    fn:         fn,

                    obj:        p_obj,

                    override:   p_override,

                    checkReady: checkContent,

                    compat:     compat

                });

            }

            _retryCount = this.POLL_RETRYS;

            // We want the first test to be immediate, but async

            setTimeout(Event._poll, 0);

            availHandle = new Y.EventHandle({

                _delete: function() {

                    // set by the event system for lazy DOM listeners

                    if (availHandle.handle) {

                        availHandle.handle.detach();

                        return;

                    }

                    var i, j;

                    // otherwise try to remove the onAvailable listener(s)

                    for (i = 0; i < a.length; i++) {

                        for (j = 0; j < _avail.length; j++) {

                            if (a[i] === _avail[j].id) {

                                _avail.splice(j, 1);

                            }

                        }

                    }

                }

            });

            return availHandle;

        },

        /**

         * Works the same way as onAvailable, but additionally checks the

         * state of sibling elements to determine if the content of the

         * available element is safe to modify.

         *

         * <p>The callback is executed with a single parameter:

         * the custom object parameter, if provided.</p>

         *

         * @method onContentReady

         *

         * @param {string}   id the id of the element to look for.

         * @param {function} fn what to execute when the element is ready.

         * @param {object}   obj an optional object to be passed back as

         *                   a parameter to fn.

         * @param {boolean|object}  override If set to true, fn will execute

         *                   in the context of p_obj.  If an object, fn will

         *                   exectute in the context of that object

         *

         * @static

         * @deprecated Use Y.on("contentready")

         */

        // @TODO fix arguments

        onContentReady: function(id, fn, obj, override, compat) {

            return Event.onAvailable(id, fn, obj, override, true, compat);

        },

        /**

         * Adds an event listener

         *

         * @method attach

         *

         * @param {String}   type     The type of event to append

         * @param {Function} fn        The method the event invokes

         * @param {String|HTMLElement|Array|NodeList} el An id, an element

         *  reference, or a collection of ids and/or elements to assign the

         *  listener to.

         * @param {Object}   context optional context object

         * @param {Boolean|object}  args 0..n arguments to pass to the callback

         * @return {EventHandle} an object to that can be used to detach the listener

         *

         * @static

         */

        attach: function(type, fn, el, context) {

            return Event._attach(Y.Array(arguments, 0, true));

        },

        _createWrapper: function (el, type, capture, compat, facade) {

            var cewrapper,

                ek  = Y.stamp(el),

                key = 'event:' + ek + type;

            if (false === facade) {

                key += 'native';

            }

            if (capture) {

                key += 'capture';

            }

            cewrapper = _wrappers[key];

            if (!cewrapper) {

                // create CE wrapper

                cewrapper = Y.publish(key, {

                    silent: true,

                    bubbles: false,

                    emitFacade:false,

                    contextFn: function() {

                        if (compat) {

                            return cewrapper.el;

                        } else {

                            cewrapper.nodeRef = cewrapper.nodeRef || Y.one(cewrapper.el);

                            return cewrapper.nodeRef;

                        }

                    }

                });

                cewrapper.overrides = {};

                // for later removeListener calls

                cewrapper.el = el;

                cewrapper.key = key;

                cewrapper.domkey = ek;

                cewrapper.type = type;

                cewrapper.fn = function(e) {

                    cewrapper.fire(Event.getEvent(e, el, (compat || (false === facade))));

                };

                cewrapper.capture = capture;

                if (el == win && type == "load") {

                    // window load happens once

                    cewrapper.fireOnce = true;

                    _windowLoadKey = key;

                }

                cewrapper._delete = _deleteAndClean;

                _wrappers[key] = cewrapper;

                _el_events[ek] = _el_events[ek] || {};

                _el_events[ek][key] = cewrapper;

                add(el, type, cewrapper.fn, capture);

            }

            return cewrapper;

        },

        _attach: function(args, conf) {

            var compat,

                handles, oEl, cewrapper, context,

                fireNow = false, ret,

                type = args[0],

                fn = args[1],

                el = args[2] || win,

                facade = conf && conf.facade,

                capture = conf && conf.capture,

                overrides = conf && conf.overrides;

            if (args[args.length-1] === COMPAT_ARG) {

                compat = true;

            }

            if (!fn || !fn.call) {

                Y.log(type + " attach call failed, invalid callback", "error", "event");

                return false;

            }

            // The el argument can be an array of elements or element ids.

            if (shouldIterate(el)) {

                handles=[];

                Y.each(el, function(v, k) {

                    args[2] = v;

                    handles.push(Event._attach(args.slice(), conf));

                });

                // return (handles.length === 1) ? handles[0] : handles;

                return new Y.EventHandle(handles);

            // If the el argument is a string, we assume it is

            // actually the id of the element.  If the page is loaded

            // we convert el to the actual element, otherwise we

            // defer attaching the event until the element is

            // ready

            } else if (Y.Lang.isString(el)) {

                // oEl = (compat) ? Y.DOM.byId(el) : Y.Selector.query(el);

                if (compat) {

                    oEl = Y.DOM.byId(el);

                } else {

                    oEl = Y.Selector.query(el);

                    switch (oEl.length) {

                        case 0:

                            oEl = null;

                            break;

                        case 1:

                            oEl = oEl[0];

                            break;

                        default:

                            args[2] = oEl;

                            return Event._attach(args, conf);

                    }

                }

                if (oEl) {

                    el = oEl;

                // Not found = defer adding the event until the element is available

                } else {

                    ret = Event.onAvailable(el, function() {

                        ret.handle = Event._attach(args, conf);

                    }, Event, true, false, compat);

                    return ret;

                }

            }

            // Element should be an html element or node

            if (!el) {

                Y.log("unable to attach event " + type, "warn", "event");

                return false;

            }

            if (Y.Node && Y.instanceOf(el, Y.Node)) {

                el = Y.Node.getDOMNode(el);

            }

            cewrapper = Event._createWrapper(el, type, capture, compat, facade);

            if (overrides) {

                Y.mix(cewrapper.overrides, overrides);

            }

            if (el == win && type == "load") {

                // if the load is complete, fire immediately.

                // all subscribers, including the current one

                // will be notified.

                if (YUI.Env.windowLoaded) {

                    fireNow = true;

                }

            }

            if (compat) {

                args.pop();

            }

            context = args[3];

            // set context to the Node if not specified

            // ret = cewrapper.on.apply(cewrapper, trimmedArgs);

            ret = cewrapper._on(fn, context, (args.length > 4) ? args.slice(4) : null);

            if (fireNow) {

                cewrapper.fire();

            }

            return ret;

        },

        /**

         * Removes an event listener.  Supports the signature the event was bound

         * with, but the preferred way to remove listeners is using the handle

         * that is returned when using Y.on

         *

         * @method detach

         *

         * @param {String} type the type of event to remove.

         * @param {Function} fn the method the event invokes.  If fn is

         * undefined, then all event handlers for the type of event are

         * removed.

         * @param {String|HTMLElement|Array|NodeList|EventHandle} el An

         * event handle, an id, an element reference, or a collection

         * of ids and/or elements to remove the listener from.

         * @return {boolean} true if the unbind was successful, false otherwise.

         * @static

         */

        detach: function(type, fn, el, obj) {

            var args=Y.Array(arguments, 0, true), compat, l, ok, i,

                id, ce;

            if (args[args.length-1] === COMPAT_ARG) {

                compat = true;

                // args.pop();

            }

            if (type && type.detach) {

                return type.detach();

            }

            // The el argument can be a string

            if (typeof el == "string") {

                // el = (compat) ? Y.DOM.byId(el) : Y.all(el);

                if (compat) {

                    el = Y.DOM.byId(el);

                } else {

                    el = Y.Selector.query(el);

                    l = el.length;

                    if (l < 1) {

                        el = null;

                    } else if (l == 1) {

                        el = el[0];

                    }

                }

                // return Event.detach.apply(Event, args);

            }

            if (!el) {

                return false;

            }

            if (el.detach) {

                args.splice(2, 1);

                return el.detach.apply(el, args);

            // The el argument can be an array of elements or element ids.

            } else if (shouldIterate(el)) {

                ok = true;

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

                    args[2] = el[i];

                    ok = ( Y.Event.detach.apply(Y.Event, args) && ok );

                }

                return ok;

            }

            if (!type || !fn || !fn.call) {

                return Event.purgeElement(el, false, type);

            }

            id = 'event:' + Y.stamp(el) + type;

            ce = _wrappers[id];

            if (ce) {

                return ce.detach(fn);

            } else {

                return false;

            }

        },

        /**

         * Finds the event in the window object, the caller's arguments, or

         * in the arguments of another method in the callstack.  This is

         * executed automatically for events registered through the event

         * manager, so the implementer should not normally need to execute

         * this function at all.

         * @method getEvent

         * @param {Event} e the event parameter from the handler

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

         * @return {Event} the event

         * @static

         */

        getEvent: function(e, el, noFacade) {

            var ev = e || win.event;

            return (noFacade) ? ev :

                new Y.DOMEventFacade(ev, el, _wrappers['event:' + Y.stamp(el) + e.type]);

        },

        /**

         * Generates an unique ID for the element if it does not already

         * have one.

         * @method generateId

         * @param el the element to create the id for

         * @return {string} the resulting id of the element

         * @static

         */

        generateId: function(el) {

            return Y.DOM.generateID(el);

        },

        /**

         * We want to be able to use getElementsByTagName as a collection

         * to attach a group of events to.  Unfortunately, different

         * browsers return different types of collections.  This function

         * tests to determine if the object is array-like.  It will also

         * fail if the object is an array, but is empty.

         * @method _isValidCollection

         * @param o the object to test

         * @return {boolean} true if the object is array-like and populated

         * @deprecated was not meant to be used directly

         * @static

         * @private

         */

        _isValidCollection: shouldIterate,

        /**

         * hook up any deferred listeners

         * @method _load

         * @static

         * @private

         */

        _load: function(e) {

            if (!_loadComplete) {

                _loadComplete = true;

                // Just in case DOMReady did not go off for some reason

                // E._ready();

                if (Y.fire) {

                    Y.fire(EVENT_READY);

                }

                // Available elements may not have been detected before the

                // window load event fires. Try to find them now so that the

                // the user is more likely to get the onAvailable notifications

                // before the window load notification