3.0.0

* Fixed hasImpl method on built classes, to look up the class

hierarchy for applied extensions.

* PluginHost can now be used on classes which don't have a

_getClasses method (preparation to break it out Base, and remove

Base dependencies)

3.0.0 beta 1

* Config argument for init event now merged into the event facade,

instead of being passed separately (available as e.cfg).

* Removed Base.create. On review, considered to be overkill.

Users can easily create new instances, using Base.build

* Moved PluginHost down from Widget to Base, since utils and

Node will also support Plugins.

* PluginHost.plug and unplug now accept the plugin class as

arguments [plug(pluginClass, cfg) and unplug(pluginClass)].

* Split base module up into base-base and base-build.

* Added lazy attribute initialization support, to improve performance.

This also removes order dependency when processing ATTRS for a

particular class.

If a get/set call is made for an uninitialized attribute A, in the

getter/setter/validator or valueFns of another attribute B, A will

be intiailized on the fly.

* Added ability to subscribe to on/after events through the

constructor config object, e.g.:

new MyBaseObject({

on: {

init: handlerFn,

myAttrChange: handlerFn

},

after: {

init: handlerFn,

myAttrChange: handlerFn

},

...

});

* Developers can now override the default clone behavior we use to

isolate default ATTRS config values, using cloneDefaultValue, e.g.:

ATTRS = {

myAttr : {

value: AnObjectOrArrayReference

cloneDefaultValue: true|false|"deep"|"shallow"

}

}

If the cloneDefaultValue property is not defined, Base will clone

any Arrays or Object literals which are used as default values when

configuring attributes for an instance, so that updates to instance

values do not modify the default value.

This behavior can be over-ridden using the cloneDefaultValue property:

true, deep:

Use Y.clone to protect the default value.

shallow:

Use Y.merge, to protect the default value.

false:

Don't clone Arrays or Object literals. The value is intended

to be used by reference, for example, when it points to

a utility object.

* Base.plug and Base.unplug used to add static Plugins (default plugins

for a class). Replaces static PLUGINS array, allowing subclasses to

easily unplug static plugins added higher up in the hierarchy.

* Base adds all attributes lazily. This means attributes don't get

initialized until the first call to get/set, speeding up construction

of Base based objects.

Attributes which have setters which set some other state in the object,

can configure the attribute to disable lazy initialization, by setting

lazyAdd:false as part of their attribute configuration, so that the setter

gets invoked during construction.

3.0.0PR1 - Initial release

Module Name: "base"

Documentation: http://developer.yahoo.com/yui/3/base

Base is designed to be a low level class from which other attribute

and event target based classes in the YUI library can be derived.

It provides a standard template for creating attribute based objects

across the library and provides a consistent init() and destroy()

sequence, by chaining initialization (initializer) and destruction

(destructor) methods for the class hierarcy.