/*
Copyright (c) 2009, Yahoo! Inc. All rights reserved.
Code licensed under the BSD License:
http://developer.yahoo.net/yui/license.txt
version: 3.0.0b1
build: 1163
*/
YUI.add('event-custom', function(Y) {
Y.Env.evt = {
handles: {},
plugins: {}
};
(function() {
/**
* Allows for the insertion of methods that are executed before or after
* a specified method
* @class Do
* @static
*/
var BEFORE = 0,
AFTER = 1;
Y.Do = {
/**
* Cache of objects touched by the utility
* @property objs
* @static
*/
objs: {},
/**
* Execute the supplied method before the specified function
* @method before
* @param fn {Function} the function to execute
* @param obj the object hosting the method to displace
* @param sFn {string} the name of the method to displace
* @param c The execution context for fn
* @return {string} handle for the subscription
* @static
*/
before: function(fn, obj, sFn, c) {
// Y.log('Do before: ' + sFn, 'info', 'event');
var f = fn, a;
if (c) {
a = [fn, c].concat(Y.Array(arguments, 4, true));
f = Y.rbind.apply(Y, a);
}
return this._inject(BEFORE, f, obj, sFn);
},
/**
* Execute the supplied method after the specified function
* @method after
* @param fn {Function} the function to execute
* @param obj the object hosting the method to displace
* @param sFn {string} the name of the method to displace
* @param c The execution context for fn
* @return {string} handle for the subscription
* @static
*/
after: function(fn, obj, sFn, c) {
var f = fn, a;
if (c) {
a = [fn, c].concat(Y.Array(arguments, 4, true));
f = Y.rbind.apply(Y, a);
}
return this._inject(AFTER, f, obj, sFn);
},
/**
* Execute the supplied method after the specified function
* @method _inject
* @param when {string} before or after
* @param fn {Function} the function to execute
* @param obj the object hosting the method to displace
* @param sFn {string} the name of the method to displace
* @param c The execution context for fn
* @return {string} handle for the subscription
* @private
* @static
*/
_inject: function(when, fn, obj, sFn) {
// object id
var id = Y.stamp(obj), o, sid;
if (! this.objs[id]) {
// create a map entry for the obj if it doesn't exist
this.objs[id] = {};
}
o = this.objs[id];
if (! o[sFn]) {
// create a map entry for the method if it doesn't exist
o[sFn] = new Y.Do.Method(obj, sFn);
// re-route the method to our wrapper
obj[sFn] =
function() {
return o[sFn].exec.apply(o[sFn], arguments);
};
}
// subscriber id
sid = id + Y.stamp(fn) + sFn;
// register the callback
o[sFn].register(sid, fn, when);
return new Y.EventHandle(o[sFn], sid);
},
/**
* Detach a before or after subscription
* @method detach
* @param handle {string} the subscription handle
*/
detach: function(handle) {
if (handle.detach) {
handle.detach();
}
},
_unload: function(e, me) {
}
};
//////////////////////////////////////////////////////////////////////////
/**
* Wrapper for a displaced method with aop enabled
* @class Do.Method
* @constructor
* @param obj The object to operate on
* @param sFn The name of the method to displace
*/
Y.Do.Method = function(obj, sFn) {
this.obj = obj;
this.methodName = sFn;
this.method = obj[sFn];
// this.before = [];
// this.after = [];
this.before = {};
this.after = {};
};
/**
* Register a aop subscriber
* @method register
* @param sid {string} the subscriber id
* @param fn {Function} the function to execute
* @param when {string} when to execute the function
*/
Y.Do.Method.prototype.register = function (sid, fn, when) {
if (when) {
// this.after.push(fn);
this.after[sid] = fn;
} else {
// this.before.push(fn);
this.before[sid] = fn;
}
};
/**
* Unregister a aop subscriber
* @method delete
* @param sid {string} the subscriber id
* @param fn {Function} the function to execute
* @param when {string} when to execute the function
*/
Y.Do.Method.prototype._delete = function (sid) {
// Y.log('Y.Do._delete: ' + sid, 'info', 'Event');
delete this.before[sid];
delete this.after[sid];
};
/**
* Execute the wrapped method
* @method exec
*/
Y.Do.Method.prototype.exec = function () {
var args = Y.Array(arguments, 0, true),
i, ret, newRet,
bf = this.before,
af = this.after,
prevented = false;
// execute before
for (i in bf) {
if (bf.hasOwnProperty(i)) {
ret = bf[i].apply(this.obj, args);
if (ret) {
switch (ret.constructor) {
case Y.Do.Halt:
return ret.retVal;
case Y.Do.AlterArgs:
args = ret.newArgs;
break;
case Y.Do.Prevent:
prevented = true;
break;
default:
}
}
}
}
// execute method
if (!prevented) {
ret = this.method.apply(this.obj, args);
}
// execute after methods.
for (i in af) {
if (af.hasOwnProperty(i)) {
newRet = af[i].apply(this.obj, args);
// Stop processing if a Halt object is returned
if (newRet && newRet.constructor == Y.Do.Halt) {
return newRet.retVal;
// Check for a new return value
} else if (newRet && newRet.constructor == Y.Do.AlterReturn) {
ret = newRet.newRetVal;
}
}
}
return ret;
};
//////////////////////////////////////////////////////////////////////////
/**
* Return an AlterArgs object when you want to change the arguments that
* were passed into the function. An example would be a service that scrubs
* out illegal characters prior to executing the core business logic.
* @class Do.AlterArgs
*/
Y.Do.AlterArgs = function(msg, newArgs) {
this.msg = msg;
this.newArgs = newArgs;
};
/**
* Return an AlterReturn object when you want to change the result returned
* from the core method to the caller
* @class Do.AlterReturn
*/
Y.Do.AlterReturn = function(msg, newRetVal) {
this.msg = msg;
this.newRetVal = newRetVal;
};
/**
* Return a Halt object when you want to terminate the execution
* of all subsequent subscribers as well as the wrapped method
* if it has not exectued yet.
* @class Do.Halt
*/
Y.Do.Halt = function(msg, retVal) {
this.msg = msg;
this.retVal = retVal;
};
/**
* Return a Prevent object when you want to prevent the wrapped function
* from executing, but want the remaining listeners to execute
* @class Do.Prevent
*/
Y.Do.Prevent = function(msg) {
this.msg = msg;
};
/**
* Return an Error object when you want to terminate the execution
* of all subsequent method calls.
* @class Do.Error
* @deprecated use Y.Do.Halt or Y.Do.Prevent
*/
Y.Do.Error = Y.Do.Halt;
//////////////////////////////////////////////////////////////////////////
// Y["Event"] && Y.Event.addListener(window, "unload", Y.Do._unload, Y.Do);
})();
(function() {
/**
* Wraps and protects a custom event for use when emitFacade is set to true.
* @class EventFacade
* @param e {Event} the custom event
* @param currentTarget {HTMLElement} the element the listener was attached to
*/
/*
var PROPS = {
details: 1,
type: 1,
target: 1,
currentTarget: 1,
stopPropagation: 2,
stopImmediatePropagation: 2,
preventDefault: 2,
halt: 2
};
Y.EventFacade = function(e, currentTarget) {
if (e) {
Y.Object.each(PROPS, function(v, k) {
//this[k] = (v == 2) ? e[k].apply(e, arguments) : e[k];
var val = e[k];
if (val) {
this[k] = (v == 2) ? function() {
if (val) {
val.apply(e, arguments);
}
} : val;
} else {
console.log('missing ' + k);
}
});
}
};
*/
Y.EventFacade = function(e, currentTarget) {
e = e || {};
/**
* The arguments passed to fire
* @property details
* @type Array
*/
this.details = e.details;
/**
* The event type
* @property type
* @type string
*/
this.type = e.type;
//////////////////////////////////////////////////////
/**
* Node reference for the targeted eventtarget
* @propery target
* @type Node
*/
this.target = e.target;
/**
* Node reference for the element that the listener was attached to.
* @propery currentTarget
* @type Node
*/
this.currentTarget = currentTarget;
/**
* Node reference to the relatedTarget
* @propery relatedTarget
* @type Node
*/
this.relatedTarget = e.relatedTarget;
/**
* Stops the propagation to the next bubble target
* @method stopPropagation
*/
this.stopPropagation = function() {
e.stopPropagation();
};
/**
* Stops the propagation to the next bubble target and
* prevents any additional listeners from being exectued
* on the current target.
* @method stopImmediatePropagation
*/
this.stopImmediatePropagation = function() {
e.stopImmediatePropagation();
};
/**
* Prevents the event's default behavior
* @method preventDefault
*/
this.preventDefault = function() {
e.preventDefault();
};
/**
* 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
*/
this.halt = function(immediate) {
e.halt(immediate);
};
};
})();
/**
* Custom event engine, DOM event listener abstraction layer, synthetic DOM
* events.
* @module event-custom
*/
/**
* Return value from all subscribe operations
* @class EventHandle
* @constructor
* @param evt {CustomEvent} the custom event
* @param sub {Subscriber} the subscriber
*/
// var onsubscribeType = "_event:onsub",
var AFTER = 'after',
CONFIGS = [
'broadcast',
'bubbles',
'context',
'contextFn',
'configured',
'currentTarget',
'defaultFn',
'details',
'emitFacade',
'fireOnce',
'host',
'preventable',
'preventedFn',
'queuable',
'silent',
'stoppedFn',
'target',
'type'
],
FACADE = new Y.EventFacade(),
FACADE_KEYS = Y.Object.keys(FACADE),
YUI3_SIGNATURE = 9,
YUI_LOG = 'yui:log';
Y.EventHandle = function(evt, sub) {
/**
* The custom event
* @type CustomEvent
*/
this.evt = evt;
/**
* The subscriber object
* @type Subscriber
*/
this.sub = sub;
};
Y.EventHandle.prototype = {
/**
* Detaches this subscriber
* @method detach
*/
detach: function() {
if (this.evt) {
// Y.log('EventHandle.detach: ' + this.sub, 'info', 'Event');
this.evt._delete(this.sub);
}
}
};
/**
* The CustomEvent class lets you define events for your application
* that can be subscribed to by one or more independent component.
*
* @param {String} type The type of event, which is passed to the callback
* when the event fires
* @param o configuration object
* @class CustomEvent
* @constructor
*/
Y.CustomEvent = function(type, o) {
// if (arguments.length > 2) {
// this.log('CustomEvent context and silent are now in the config', 'warn', 'Event');
// }
o = o || {};
this.id = Y.stamp(this);
/**
* The type of event, returned to subscribers when the event fires
* @property type
* @type string
*/
this.type = type;
/**
* The context the the event will fire from by default. Defaults to the YUI
* instance.
* @property context
* @type object
*/
this.context = Y;
this.logSystem = (type == YUI_LOG);
/**
* If 0, this event does not broadcast. If 1, the YUI instance is notified
* every time this event fires. If 2, the YUI instance and the YUI global
* (if event is enabled on the global) are notified every time this event
* fires.
* @property broadcast
* @type int
*/
// this.broadcast = 0;
/**
* By default all custom events are logged in the debug build, set silent
* to true to disable debug outpu for this event.
* @property silent
* @type boolean
*/
this.silent = this.logSystem;
// this.queuable = false;
/**
* The subscribers to this event
* @property subscribers
* @type Subscriber{}
*/
this.subscribers = {};
/*
* The publisher has configured this event
* @property configured
* @type boolean
* @default true
*/
// this.configured = true;
/**
* 'After' subscribers
* @property afters
* @type Subscriber{}
*/
this.afters = {};
/**
* This event has fired if true
*
* @property fired
* @type boolean
* @default false;
*/
// this.fired = false;
/**
* This event should only fire one time if true, and if
* it has fired, any new subscribers should be notified
* immediately.
*
* @property fireOnce
* @type boolean
* @default false;
*/
// this.fireOnce = false;
/**
* Flag for stopPropagation that is modified during fire()
* 1 means to stop propagation to bubble targets. 2 means
* to also stop additional subscribers on this target.
* @property stopped
* @type int
*/
// this.stopped = 0;
/**
* Flag for preventDefault that is modified during fire().
* if it is not 0, the default behavior for this event
* @property prevented
* @type int
*/
// this.prevented = 0;
/**
* Specifies the host for this custom event. This is used
* to enable event bubbling
* @property host
* @type EventTarget
*/
// this.host = null;
/**
* The default function to execute after event listeners
* have fire, but only if the default action was not
* prevented.
* @property defaultFn
* @type Function
*/
// this.defaultFn = null;
/**
* The function to execute if a subscriber calls
* stopPropagation or stopImmediatePropagation
* @property stoppedFn
* @type Function
*/
// this.stoppedFn = null;
/**
* The function to execute if a subscriber calls
* preventDefault
* @property preventedFn
* @type Function
*/
// this.preventedFn = null;
/**
* Specifies whether or not this event's default function
* can be cancelled by a subscriber by executing preventDefault()
* on the event facade
* @property preventable
* @type boolean
* @default true
*/
this.preventable = true;
/**
* Specifies whether or not a subscriber can stop the event propagation
* via stopPropagation(), stopImmediatePropagation(), or halt()
* @property bubbles
* @type boolean
* @default true
*/
this.bubbles = true;
/**
* Supports multiple options for listener signatures in order to
* port YUI 2 apps.
* @property signature
* @type int
* @default 9
*/
this.signature = YUI3_SIGNATURE;
// this.hasSubscribers = false;
// this.hasAfters = false;
/**
* If set to true, the custom event will deliver an EventFacade object
* that is similar to a DOM event object.
* @property emitFacade
* @type boolean
* @default false
*/
// this.emitFacade = false;
this.applyConfig(o, true);
// this.log("Creating " + this.type);
};
Y.CustomEvent.prototype = {
_YUI_EVENT: true,
/**
* Apply configuration properties. Only applies the CONFIG whitelist
* @method applyConfig
* @param o hash of properties to apply
* @param force {boolean} if true, properties that exist on the event
* will be overwritten.
*/
applyConfig: function(o, force) {
if (o) {
Y.mix(this, o, force, CONFIGS);
}
},
_on: function(fn, context, args, when) {
if (!fn) {
Y.error("Invalid callback for CE: " + this.type);
}
var s = new Y.Subscriber(fn, context, args, when);
if (this.fireOnce && this.fired) {
Y.later(0, this, this._notify, s);
}
if (when == AFTER) {
this.afters[s.id] = s;
this.hasAfters = true;
} else {
this.subscribers[s.id] = s;
this.hasSubscribers = true;
}
return new Y.EventHandle(this, s);
},
/**
* Listen for this event
* @method subscribe
* @param {Function} fn The function to execute
* @return {EventHandle|EventTarget} unsubscribe handle or a
* chainable event target depending on the 'chain' config.
* @deprecated use on
*/
subscribe: function(fn, context) {
var a = (arguments.length > 2) ? Y.Array(arguments, 2, true): null;
return this._on(fn, context, a, true);
},
/**
* Listen for this event
* @method on
* @param {Function} fn The function to execute
* @return {EventHandle|EventTarget} unsubscribe handle or a
* chainable event target depending on the 'chain' config.
*/
on: function(fn, context) {
var a = (arguments.length > 2) ? Y.Array(arguments, 2, true): null;
return this._on(fn, context, a, true);
},
/**
* Listen for this event after the normal subscribers have been notified and
* the default behavior has been applied. If a normal subscriber prevents the
* default behavior, it also prevents after listeners from firing.
* @method after
* @param {Function} fn The function to execute
* @return {EventHandle|EventTarget} unsubscribe handle or a
* chainable event target depending on the 'chain' config.
*/
after: function(fn, context) {
var a = (arguments.length > 2) ? Y.Array(arguments, 2, true): null;
return this._on(fn, context, a, AFTER);
},
/**
* Detach listeners.
* @method detach
* @param {Function} fn The subscribed function to remove, if not supplied
* all will be removed
* @param {Object} context The context object passed to subscribe.
* @return {boolean|EventTarget} returns a chainable event target
* or a boolean for legacy detach support.
*/
detach: function(fn, context) {
// if arg[0] typeof unsubscribe handle
if (fn && fn.detach) {
return fn.detach();
}
if (!fn) {
return this.unsubscribeAll();
}
var found = false, subs = this.subscribers, i, s;
for (i in subs) {
if (subs.hasOwnProperty(i)) {
s = subs[i];
if (s && s.contains(fn, context)) {
this._delete(s);
found = true;
}
}
}
return found;
},
/**
* Detach listeners.
* @method unsubscribe
* @param {Function} fn The subscribed function to remove, if not supplied
* all will be removed
* @param {Object} context The context object passed to subscribe.
* @return {boolean|EventTarget} returns a chainable event target
* or a boolean for legacy detach support.
* @deprecated use detach
*/
unsubscribe: function() {
return this.detach.apply(this, arguments);
},
_getFacade: function() {
var ef = this._facade, o, args = this.details, o2;
if (!ef) {
ef = new Y.EventFacade(this, this.currentTarget);
}
// if the first argument is an object literal, apply the
// properties to the event facade
o = args && args[0];
if (Y.Lang.isObject(o, true)) {
o2 = {};
// protect the event facade properties
Y.mix(o2, ef, true, FACADE_KEYS);
// mix the data
Y.mix(ef, o, true);
// restore ef
Y.mix(ef, o2, true, FACADE_KEYS);
}
// update the details field with the arguments
// ef.type = this.type;
ef.details = this.details;
ef.target = this.target;
ef.currentTarget = this.currentTarget;
ef.stopped = 0;
ef.prevented = 0;
this._facade = ef;
return this._facade;
},
/**
* Notify a single subscriber
* @method _notify
* @param s {Subscriber} the subscriber
* @param args {Array} the arguments array to apply to the listener
* @private
*/
_notify: function(s, args, ef) {
this.log(this.type + "->" + ": " + s);
var ret;
// emit an EventFacade if this is that sort of event
if (this.emitFacade) {
// @TODO object literal support to fire makes it possible for
// config info to be passed if we wish.
if (!ef) {
ef = this._getFacade(args);
if (Y.Lang.isObject(args[0])) {
args[0] = ef;
} else {
args.unshift(ef);
}
}
}
ret = s.notify(args, this);
if (false === ret || this.stopped > 1) {
this.log(this.type + " cancelled by subscriber");
return false;
}
return true;
},
/**
* Logger abstraction to centralize the application of the silent flag
* @method log
* @param msg {string} message to log
* @param cat {string} log category
*/
log: function(msg, cat) {
if (!this.silent) {
Y.log(this.id + ': ' + msg, cat || "info", "event");
}
},
/**
* Notifies the subscribers. The callback functions will be executed
* from the context specified when the event was created, and with the
* following parameters:
* <ul>
* <li>The type of event</li>
* <li>All of the arguments fire() was executed with as an array</li>
* <li>The custom object (if any) that was passed into the subscribe()
* method</li>
* </ul>
* @method fire
* @param {Object*} arguments an arbitrary set of parameters to pass to
* the handler.
* @return {boolean} false if one of the subscribers returned false,
* true otherwise
*/
fire: function() {
var es = Y.Env._eventstack,
subs, s, args, i, ef, q, queue, ce, hasSub,
ret = true, events;
// @TODO find a better way to short circuit this.
// if (!this.broadcast && !this.defaultFn && !this.hasSubscribers && !this.hasAfters) {
// return true;
// }
if (es) {
// queue this event if the current item in the queue bubbles
// if (b && this.queuable && this.type != es.next.type) {
if (this.queuable && this.type != es.next.type) {
this.log('queue ' + this.type);
es.queue.push([this, arguments]);
return true;
}
} else {
Y.Env._eventstack = {
// id of the first event in the stack
id: this.id,
next: this,
silent: this.silent,
logging: (this.type === YUI_LOG),
stopped: 0,
prevented: 0,
queue: []
};
es = Y.Env._eventstack;
}
if (this.fireOnce && this.fired) {
this.log('fireOnce event: ' + this.type + ' already fired');
} else {
args = Y.Array(arguments, 0, true);
this.stopped = 0;
this.prevented = 0;
this.target = this.target || this.host;
events = new Y.EventTarget({
fireOnce: true,
context: this.host
});
this.events = events;
if (this.preventedFn) {
events.on('prevented', this.preventedFn);
}
if (this.stoppedFn) {
events.on('stopped', this.stoppedFn);
}
this.currentTarget = this.host || this.currentTarget;
this.fired = true;
this.details = args.slice(); // original arguments in the details
// this.log("Firing " + this + ", " + "args: " + args);
this.log("Firing " + this.type);
hasSub = false;
es.lastLogState = es.logging;
ef = null;
if (this.emitFacade) {
// this.fire({
// foo: 1
// bar: 2
// }
// this.fire({
// bar: 2
// } // foo is still 1 unless we create a new facade
this._facade = null;
ef = this._getFacade(args);
if (Y.Lang.isObject(args[0])) {
args[0] = ef;
} else {
args.unshift(ef);
}
}
if (this.hasSubscribers) {
subs = Y.merge(this.subscribers);
for (i in subs) {
if (subs.hasOwnProperty(i)) {
if (!hasSub) {
es.logging = (es.logging || (this.type === YUI_LOG));
hasSub = true;
}
// stopImmediatePropagation
if (this.stopped == 2) {
break;
}
s = subs[i];
if (s && s.fn) {
ret = this._notify(s, args, ef);
if (false === ret) {
this.stopped = 2;
}
}
}
}
}
es.logging = (es.lastLogState);
// bubble if this is hosted in an event target and propagation has not been stopped
if (this.bubbles && this.host && !this.stopped) {
es.stopped = 0;
es.prevented = 0;
ret = this.host.bubble(this);
this.stopped = Math.max(this.stopped, es.stopped);
this.prevented = Math.max(this.prevented, es.prevented);
}
// execute the default behavior if not prevented
if (this.defaultFn && !this.prevented) {
this.defaultFn.apply(this.host || this, args);
}
// broadcast listeners are fired as discreet events on the
// YUI instance and potentially the YUI global.
if (!this.stopped && this.broadcast) {
if (this.host !== Y) {
Y.fire.apply(Y, args);
}
if (this.broadcast == 2) {
Y.Global.fire.apply(Y.Global, args);
}
}
// process after listeners. If the default behavior was
// prevented, the after events don't fire.
if (this.hasAfters && !this.prevented && this.stopped < 2) {
subs = Y.merge(this.afters);
for (i in subs) {
if (subs.hasOwnProperty(i)) {
if (!hasSub) {
es.logging = (es.logging || (this.type === YUI_LOG));
hasSub = true;
}
// stopImmediatePropagation
if (this.stopped == 2) {
break;
}
s = subs[i];
if (s && s.fn) {
ret = this._notify(s, args, ef);
if (false === ret) {
this.stopped = 2;
}
}
}
}
}
}
if (es.id === this.id) {
// console.log('clearing stack: ' + es.id + ', ' + this);
// reset propragation properties while processing the rest of the queue
// process queued events
queue = es.queue;
while (queue.length) {
// q[0] = the event, q[1] = arguments to fire
q = queue.pop();
ce = q[0];
// Y.log('firing queued event ' + ce.type + ', from ' + this);
es.stopped = 0;
es.prevented = 0;
// set up stack to allow the next item to be processed
es.next = ce;
ret = ce.fire.apply(ce, q[1]);
}
Y.Env._eventstack = null;
}
return (ret !== false);
},
/**
* Removes all listeners
* @method unsubscribeAll
* @return {int} The number of listeners unsubscribed
* @deprecated use detachAll
*/
unsubscribeAll: function() {
return this.detachAll.apply(this, arguments);
},
/**
* Removes all listeners
* @method detachAll
* @return {int} The number of listeners unsubscribed
*/
detachAll: function() {
var subs = this.subscribers, i, l=0;
for (i in subs) {
if (subs.hasOwnProperty(i)) {
this._delete(subs[i]);
l++;
}
}
this.subscribers={};
return l;
},
/**
* @method _delete
* @param subscriber object
* @private
*/
_delete: function(s) {
if (s) {
delete s.fn;
delete s.context;
delete this.subscribers[s.id];
delete this.afters[s.id];
}
},
/**
* @method toString
*/
toString: function() {
return this.type;
},
/**
* Stop propagation to bubble targets
* @method stopPropagation
*/
stopPropagation: function() {
this.stopped = 1;
Y.Env._eventstack.stopped = 1;
this.events.fire('stopped', this);
},
/**
* Stops propagation to bubble targets, and prevents any remaining
* subscribers on the current target from executing.
* @method stopImmediatePropagation
*/
stopImmediatePropagation: function() {
this.stopped = 2;
Y.Env._eventstack.stopped = 2;
this.events.fire('stopped', this);
},
/**
* Prevents the execution of this event's defaultFn
* @method preventDefault
*/
preventDefault: function() {
if (this.preventable) {
this.prevented = 1;
Y.Env._eventstack.prevented = 1;
this.events.fire('prevented', this);
}
},
/**
* 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
*/
halt: function(immediate) {
if (immediate) {
this.stopImmediatePropagation();
} else {
this.stopPropagation();
}
this.preventDefault();
}
};
/////////////////////////////////////////////////////////////////////
/**
* Stores the subscriber information to be used when the event fires.
* @param {Function} fn The wrapped function to execute
* @param {Object} context The value of the keyword 'this' in the listener
* @param {Array} args* 0..n additional arguments to supply the listener
*
* @class Subscriber
* @constructor
*/
Y.Subscriber = function(fn, context, args) {
/**
* The callback that will be execute when the event fires
* This is wrapped by Y.rbind if obj was supplied.
* @property fn
* @type Function
*/
this.fn = fn;
/**
* Optional 'this' keyword for the listener
* @property context
* @type Object
*/
this.context = context;
/**
* Unique subscriber id
* @property id
* @type String
*/
this.id = Y.stamp(this);
/*
* }
* fn bound to obj with additional arguments applied via Y.rbind
* @property wrappedFn
* @type Function
*/
// this.wrappedFn = fn;
/**
* Additional arguments to propagate to the subscriber
* @property args
* @type Array
*/
this.args = args;
/**
* Custom events for a given fire transaction.
* @property events
* @type {EventTarget}
*/
this.events = null;
// if (context) {
// this.wrappedFn = Y.rbind.apply(Y, args);
// }
};
Y.Subscriber.prototype = {
_notify: function(c, args, ce) {
var a = this.args, ret;
switch (ce.signature) {
case 0:
ret = this.fn.call(c, ce.type, args, c);
break;
case 1:
ret = this.fn.call(c, args[0] || null, c);
break;
default:
if (a || args) {
args = args || [];
a = (a) ? args.concat(a) : args;
ret = this.fn.apply(c, a);
} else {
ret = this.fn.call(c);
}
}
return ret;
},
/**
* Executes the subscriber.
* @method notify
* @param args {Array} Arguments array for the subscriber
* @param ce {CustomEvent} The custom event that sent the notification
*/
notify: function(args, ce) {
var c = this.context,
ret = true;
if (!c) {
c = (ce.contextFn) ? ce.contextFn() : ce.context;
}
// Ease debugging by only catching errors if we will not re-throw
// them.
if (Y.config.throwFail) {
ret = this._notify(c, args, ce);
} else {
try {
ret = this._notify(c, args, ce);
} catch(e) {
Y.error(this + ' failed: ' + e.message, e);
}
}
return ret;
},
/**
* Returns true if the fn and obj match this objects properties.
* Used by the unsubscribe method to match the right subscriber.
*
* @method contains
* @param {Function} fn the function to execute
* @param {Object} context optional 'this' keyword for the listener
* @return {boolean} true if the supplied arguments match this
* subscriber's signature.
*/
contains: function(fn, context) {
if (context) {
return ((this.fn == fn) && this.context == context);
} else {
return (this.fn == fn);
}
},
/**
* @method toString
*/
toString: function() {
return "Subscriber " + this.id;
}
};
// FACADE = new Y.EventFacade(new Y.CustomEvent('x'));
(function() {
/**
* EventTarget provides the implementation for any object to
* publish, subscribe and fire to custom events, and also
* alows other EventTargets to target the object with events
* sourced from the other object.
* EventTarget is designed to be used with Y.augment to wrap
* EventCustom in an interface that allows events to be listened to
* and fired by name. This makes it possible for implementing code to
* subscribe to an event that either has not been created yet, or will
* not be created at all.
* @class EventTarget
* @param opts a configuration object
* @config emitFacade {boolean} if true, all events will emit event
* facade payloads by default (default false)
* @config prefix {string} the prefix to apply to non-prefixed event names
* @config chain {boolean} if true, on/after/detach return the host to allow
* chaining, otherwise they return an EventHandle (default false)
*/
var L = Y.Lang,
PREFIX_DELIMITER = ':',
CATEGORY_DELIMITER = '|',
AFTER_PREFIX = '~AFTER~',
/**
* If the instance has a prefix attribute and the
* event type is not prefixed, the instance prefix is
* applied to the supplied type.
* @method _getType
* @private
*/
_getType = Y.cached(function(type, pre) {
if (!pre || !L.isString(type) || type.indexOf(PREFIX_DELIMITER) > -1) {
return type;
}
return pre + PREFIX_DELIMITER + type;
}),
/**
* Returns an array with the detach key (if provided),
* and the prefixed event name from _getType
* Y.on('detachcategory, menu:click', fn)
* @method _parseType
* @private
*/
_parseType = Y.cached(function(type, pre) {
var t = type, detachcategory, after, i, full_t;
if (!L.isString(t)) {
return t;
}
i = t.indexOf(AFTER_PREFIX);
if (i > -1) {
after = true;
t = t.substr(AFTER_PREFIX.length);
// Y.log(t);
}
// parts = t.split(DETACH_PREFIX_SPLITTER);
// if (parts.length > 1) {
// detachcategory = parts[0];
// t = parts[1];
// if (t == '*') {
// t = null;
// }
// }
i = t.indexOf(CATEGORY_DELIMITER);
if (i > -1) {
detachcategory = t.substr(0, (i));
t = t.substr(i+1);
if (t == '*') {
t = null;
}
}
full_t = _getType(t, pre);
return [detachcategory, full_t, after, t];
}),
ET = function(opts) {
// console.log('EventTarget constructor executed: ' + this._yuid);
var o = (L.isObject(opts)) ? opts : {};
this._yuievt = {
id: Y.guid(),
events: {},
targets: {},
config: o,
chain: ('chain' in o) ? o.chain : Y.config.chain,
defaults: {
context: o.context || this,
host: this,
emitFacade: o.emitFacade,
fireOnce: o.fireOnce,
queuable: o.queuable,
broadcast: o.broadcast,
bubbles: ('bubbles' in o) ? o.bubbles : true
}
};
};
ET.prototype = {
/**
* Subscribe to a custom event hosted by this object
* @method on
* @param type {string} The type of the event
* @param fn {Function} The callback
* @return the event target or a detach handle per 'chain' config
*/
on: function(type, fn, context, x) {
var parts = _parseType(type, this._yuievt.config.prefix), f, c, args, ret, ce,
detachcategory, handle, store = Y.Env.evt.handles, after, adapt, shorttype,
Node = Y.Node, n;
if (L.isObject(type, true)) {
f = fn;
c = context;
args = Y.Array(arguments, 0, true);
ret = {};
after = type._after;
delete type._after;
Y.each(type, function(v, k) {
if (v) {
f = v.fn || ((Y.Lang.isFunction(v)) ? v : f);
c = v.context || c;
}
args[0] = (after) ? AFTER_PREFIX + k : k;
args[1] = f;
args[2] = c;
ret[k] = this.on.apply(this, args);
}, this);
return (this._yuievt.chain) ? this : ret;
} else if (L.isFunction(type)) {
return Y.Do.before.apply(Y.Do, arguments);
}
detachcategory = parts[0];
after = parts[2];
shorttype = parts[3];
// extra redirection so we catch adaptor events too. take a look at this.
if (Node && (this instanceof Node) && (shorttype in Node.DOM_EVENTS)) {
args = Y.Array(arguments, 0, true);
args.splice(2, 0, Node.getDOMNode(this));
return Y.on.apply(Y, args);
}
type = parts[1];
if (this instanceof YUI) {
adapt = Y.Env.evt.plugins[type];
args = Y.Array(arguments, 0, true);
args[0] = shorttype;
// check for the existance of an event adaptor
if (adapt && adapt.on) {
n = args[2];
Y.log('Using adaptor for ' + shorttype + ', ' + n, 'info', 'event');
if (Node && n && (n instanceof Node)) {
args[2] = Node.getDOMNode(n);
}
handle = adapt.on.apply(Y, args);
// check to see if the target is an EventTarget. If so,
// delegate to it (the EventTarget should handle whether
// or not the prefix was included);
// } else if (o && !(o instanceof YUI) && o.getEvent) {
// a = Y.Array(arguments, 0, true);
// a.splice(2, 1);
// return o.on.apply(o, a);
// } else if ((!type) || (!adapt && type.indexOf(':') == -1)) {
} else if ((!type) || (!adapt && Node && (shorttype in Node.DOM_EVENTS))) {
handle = Y.Event._attach(args);
}
}
if (!handle) {
// Y.log('parts: ' + parts);
ce = this._yuievt.events[type] || this.publish(type);
// args = Y.Array(arguments, 1, true);
// f = (after) ? ce.after : ce.on;
// handle = f.apply(ce, args);
handle = ce._on(fn, context, (arguments.length > 3) ? Y.Array(arguments, 3, true) : null, (after) ? 'after' : true);
}
if (detachcategory) {
store[detachcategory] = store[detachcategory] || {};
store[detachcategory][type] = store[detachcategory][type] || [];
store[detachcategory][type].push(handle);
// Y.log('storing: ' + key);
}
return (this._yuievt.chain) ? this : handle;
},
/**
* subscribe to an event
* @method subscribe
* @deprecated use on
*/
subscribe: function() {
return this.on.apply(this, arguments);
},
/**
* Detach one or more listeners the from the specified event
* @method detach
* @param type {string|Object} Either the handle to the subscriber or the
* type of event. If the type
* is not specified, it will attempt to remove
* the listener from all hosted events.
* @param fn {Function} The subscribed function to unsubscribe, if not
* supplied, all subscribers will be removed.
* @param context {Object} The custom object passed to subscribe. This is
* optional, but if supplied will be used to
* disambiguate multiple listeners that are the same
* (e.g., you subscribe many object using a function
* that lives on the prototype)
* @return {EventTarget} the host
*/
detach: function(type, fn, context) {
var parts = _parseType(type, this._yuievt.config.prefix),
detachcategory = L.isArray(parts) ? parts[0] : null,
shorttype = (parts) ? parts[3] : null,
handle, adapt, store = Y.Env.evt.handles, cat, args,
evts = this._yuievt.events, ce, i, ret = true,
keyDetacher = function(lcat, ltype) {
var handles = lcat[ltype];
if (handles) {
while (handles.length) {
handle = handles.pop();
handle.detach();
}
}
};
if (detachcategory) {
cat = store[detachcategory];
type = parts[1];
if (cat) {
if (type) {
keyDetacher(cat, type);
} else {
for (i in cat) {
if (cat.hasOwnProperty(i)) {
keyDetacher(cat, i);
}
}
}
return (this._yuievt.chain) ? this : true;
}
// If this is an event handle, use it to detach
} else if (L.isObject(type) && type.detach) {
ret = type.detach();
return (this._yuievt.chain) ? this : true;
// extra redirection so we catch adaptor events too. take a look at this.
} else if (Y.Node && (this instanceof Y.Node) && ((!shorttype) || (shorttype in Y.Node.DOM_EVENTS))) {
args = Y.Array(arguments, 0, true);
args[2] = Y.Node.getDOMNode(this);
return Y.detach.apply(Y, args);
}
adapt = Y.Env.evt.plugins[shorttype];
// The YUI instance handles DOM events and adaptors
if (this instanceof YUI) {
args = Y.Array(arguments, 0, true);
// use the adaptor specific detach code if
if (adapt && adapt.detach) {
return adapt.detach.apply(Y, args);
// DOM event fork
} else if (!type || (!adapt && type.indexOf(':') == -1)) {
args[0] = type;
return Y.Event.detach.apply(Y.Event, args);
}
}
if (type) {
ce = evts[type];
if (ce) {
return ce.detach(fn, context);
}
} else {
for (i in evts) {
if (evts.hasOwnProperty(i)) {
ret = ret && evts[i].detach(fn, context);
}
}
return ret;
}
return (this._yuievt.chain) ? this : false;
},
/**
* detach a listener
* @method unsubscribe
* @deprecated use detach
*/
unsubscribe: function() {
return this.detach.apply(this, arguments);
},
/**
* Removes all listeners from the specified event. If the event type
* is not specified, all listeners from all hosted custom events will
* be removed.
* @method detachAll
* @param type {string} The type, or name of the event
*/
detachAll: function(type) {
type = _getType(type, this._yuievt.config.prefix);
return this.detach(type);
},
/**
* Removes all listeners from the specified event. If the event type
* is not specified, all listeners from all hosted custom events will
* be removed.
* @method unsubscribeAll
* @param type {string} The type, or name of the event
* @deprecated use detachAll
*/
unsubscribeAll: function() {
return this.detachAll.apply(this, arguments);
},
/**
* Creates a new custom event of the specified type. If a custom event
* by that name already exists, it will not be re-created. In either
* case the custom event is returned.
*
* @method publish
*
* @param type {string} the type, or name of the event
* @param opts {object} optional config params. Valid properties are:
*
* <ul>
* <li>
* 'broadcast': whether or not the YUI instance and YUI global are notified when the event is fired (false)
* </li>
* <li>
* 'bubbles': whether or not this event bubbles (true)
* </li>
* <li>
* 'context': the default execution context for the listeners (this)
* </li>
* <li>
* 'defaultFn': the default function to execute when this event fires if preventDefault was not called
* </li>
* <li>
* 'emitFacade': whether or not this event emits a facade (false)
* </li>
* <li>
* 'prefix': the prefix for this targets events, e.g., 'menu' in 'menu:click'
* </li>
* <li>
* 'fireOnce': if an event is configured to fire once, new subscribers after
* the fire will be notified immediately.
* </li>
* <li>
* 'preventable': whether or not preventDefault() has an effect (true)
* </li>
* <li>
* 'preventedFn': a function that is executed when preventDefault is called
* </li>
* <li>
* 'queuable': whether or not this event can be queued during bubbling (false)
* </li>
* <li>
* 'silent': if silent is true, debug messages are not provided for this event.
* </li>
* <li>
* 'stoppedFn': a function that is executed when stopPropagation is called
* </li>
* <li>
* 'type': the event type (valid option if not provided as the first parameter to publish)
* </li>
* </ul>
*
* @return {Event.Custom} the custom event
*
*/
publish: function(type, opts) {
// this._yuievt.config.prefix
type = _getType(type, this._yuievt.config.prefix);
var events, ce, ret, o;
if (L.isObject(type)) {
ret = {};
Y.each(type, function(v, k) {
ret[k] = this.publish(k, v || opts);
}, this);
return ret;
}
events = this._yuievt.events;
ce = events[type];
//if (ce && !ce.configured) {
if (ce) {
// ce.log("publish applying new config to published event: '"+type+"' exists", 'info', 'event');
if (opts) {
ce.applyConfig(opts, true);
}
} else {
o = (opts) ? Y.mix(opts, this._yuievt.defaults) : this._yuievt.defaults;
// apply defaults
ce = new Y.CustomEvent(type, o);
events[type] = ce;
}
// make sure we turn the broadcast flag off if this
// event was published as a result of bubbling
if (opts instanceof Y.CustomEvent) {
events[type].broadcast = false;
}
return events[type];
},
/**
* Registers another EventTarget as a bubble target. Bubble order
* is determined by the order registered. Multiple targets can
* be specified.
* @method addTarget
* @param o {EventTarget} the target to add
*/
addTarget: function(o) {
this._yuievt.targets[Y.stamp(o)] = o;
this._yuievt.hasTargets = true;
},
/**
* Removes a bubble target
* @method removeTarget
* @param o {EventTarget} the target to remove
*/
removeTarget: function(o) {
delete this._yuievt.targets[Y.stamp(o)];
},
/**
* Fire a custom event by name. The callback functions will be executed
* from the context specified when the event was created, and with the
* following parameters.
*
* If the custom event object hasn't been created, then the event hasn't
* been published and it has no subscribers. For performance sake, we
* immediate exit in this case. This means the event won't bubble, so
* if the intention is that a bubble target be notified, the event must
* be published on this object first.
*
* @method fire
* @param type {String|Object} The type of the event, or an object that contains
* a 'type' property.
* @param arguments {Object*} an arbitrary set of parameters to pass to
* the handler.
* @return {boolean} the return value from Event.Custom.fire
*
*/
fire: function(type) {
var typeIncluded = L.isString(type),
t = (typeIncluded) ? type : (type && type.type),
ce, a, ret;
t = _getType(t, this._yuievt.config.prefix);
ce = this.getEvent(t);
// this event has not been published or subscribed to
if (!ce) {
// if this object has bubble targets, we need to publish the
// event in order for it to bubble.
if (this._yuievt.hasTargets) {
// ce = this.publish(t);
// ce.details = Y.Array(arguments, (typeIncluded) ? 1 : 0, true);
a = (typeIncluded) ? arguments : Y.Array(arguments, 0, true).unshift(t);
return this.bubble(null, a, this);
}
// otherwise there is nothing to be done
ret = true;
} else {
a = Y.Array(arguments, (typeIncluded) ? 1 : 0, true);
ret = ce.fire.apply(ce, a);
// clear target for next fire()
ce.target = null;
}
return (this._yuievt.chain) ? this : ret;
},
/**
* Returns the custom event of the provided type has been created, a
* falsy value otherwise
* @method getEvent
* @param type {string} the type, or name of the event
* @return {Event.Custom} the custom event or null
*/
getEvent: function(type) {
type = _getType(type, this._yuievt.config.prefix);
var e = this._yuievt.events;
return (e && type in e) ? e[type] : null;
},
/**
* Propagate an event
* @method bubble
* @param evt {Event.Custom} the custom event to propagate
* @return {boolean} the aggregated return value from Event.Custom.fire
*/
bubble: function(evt, args, target) {
var targs = this._yuievt.targets, ret = true,
t, type, ce, i;
if (!evt || ((!evt.stopped) && targs)) {
// Y.log('Bubbling ' + evt.type);
for (i in targs) {
if (targs.hasOwnProperty(i)) {
t = targs[i];
type = evt && evt.type;
ce = t.getEvent(type);
// if this event was not published on the bubble target,
// publish it with sensible default properties
if (!ce) {
// publish the event on the bubble target using this event
// for its configuration
// ce = t.publish(type, evt);
// set the host and context appropriately
// ce.context = (evt.host === evt.context) ? t : evt.context;
// ce.host = t;
// clear handlers if specified on this event
// ce.defaultFn = null;
// ce.preventedFn = null;
// ce.stoppedFn = null;
if (t._yuievt.hasTargets) {
t.bubble.call(t, evt, args, target);
}
} else {
ce.target = target || (evt && evt.target) || this;
ce.currentTarget = t;
ret = ret && ce.fire.apply(ce, args || evt.details);
// stopPropagation() was called
if (ce.stopped) {
break;
}
}
}
}
}
return ret;
},
/**
* Subscribe to a custom event hosted by this object. The
* supplied callback will execute after any listeners add
* via the subscribe method, and after the default function,
* if configured for the event, has executed.
* @method after
* @param type {string} The type of the event
* @param fn {Function} The callback
* @return the event target or a detach handle per 'chain' config
*/
after: function(type, fn) {
var a = Y.Array(arguments, 0, true);
switch (L.type(type)) {
case 'function':
return Y.Do.after.apply(Y.Do, arguments);
case 'object':
a[0]._after = true;
break;
default:
a[0] = AFTER_PREFIX + type;
}
return this.on.apply(this, a);
},
/**
* Executes the callback before a DOM event, custom event
* or method. If the first argument is a function, it
* is assumed the target is a method. For DOM and custom
* events, this is an alias for Y.on.
*
* For DOM and custom events:
* type, callback, context, 1-n arguments
*
* For methods:
* callback, object (method host), methodName, context, 1-n arguments
*
* @method before
* @return detach handle
* @deprecated use the on method
*/
before: function() {
return this.on.apply(this, arguments);
}
};
Y.EventTarget = ET;
// make Y an event target
Y.mix(Y, ET.prototype, false, false, {
bubbles: false
});
ET.call(Y);
YUI.Env.globalEvents = YUI.Env.globalEvents || new ET();
/**
* Hosts YUI page level events. This is where events bubble to
* when the broadcast config is set to 2. This property is
* only available if the custom event module is loaded.
* @property Global
* @type EventTarget
* @for YUI
*/
Y.Global = YUI.Env.globalEvents;
// @TODO implement a global namespace function on Y.Global?
})();
}, '3.0.0b1' ,{requires:['oop']});