(function() {
var Lang = YAHOO.util.Lang;
/*
Copyright (c) 2006, Yahoo! Inc. All rights reserved.
Code licensed under the BSD License:
http://developer.yahoo.net/yui/license.txt
*/
/**
* Provides and manages YAHOO.util.Attribute instances
* @namespace YAHOO.util
* @class AttributeProvider
* @uses YAHOO.util.EventProvider
*/
YAHOO.util.AttributeProvider = function() {};
YAHOO.util.AttributeProvider.prototype = {
/**
* A key-value map of Attribute configurations
* @property _configs
* @protected (may be used by subclasses and augmentors)
* @private
* @type {Object}
*/
_configs: null,
/**
* Returns the current value of the attribute.
* @method get
* @param {String} key The attribute whose value will be returned.
*/
get: function(key){
this._configs = this._configs || {};
var config = this._configs[key];
if (!config) {
YAHOO.log(key + ' not found', 'error', 'AttributeProvider');
return undefined;
}
return config.value;
},
/**
* Sets the value of a config.
* @method set
* @param {String} key The name of the attribute
* @param {Any} value The value to apply to the attribute
* @param {Boolean} silent Whether or not to suppress change events
* @return {Boolean} Whether or not the value was set.
*/
set: function(key, value, silent){
this._configs = this._configs || {};
var config = this._configs[key];
if (!config) {
YAHOO.log('set failed: ' + key + ' not found',
'error', 'AttributeProvider');
return false;
}
return config.setValue(value, silent);
},
/**
* Returns an array of attribute names.
* @method getAttributeKeys
* @return {Array} An array of attribute names.
*/
getAttributeKeys: function(){
this._configs = this._configs;
var keys = [];
var config;
for (var key in this._configs) {
config = this._configs[key];
if ( Lang.hasOwnProperty(this._configs, key) &&
!Lang.isUndefined(config) ) {
keys[keys.length] = key;
}
}
return keys;
},
/**
* Sets multiple attribute values.
* @method setAttributes
* @param {Object} map A key-value map of attributes
* @param {Boolean} silent Whether or not to suppress change events
*/
setAttributes: function(map, silent){
for (var key in map) {
if ( Lang.hasOwnProperty(map, key) ) {
this.set(key, map[key], silent);
}
}
},
/**
* Resets the specified attribute's value to its initial value.
* @method resetValue
* @param {String} key The name of the attribute
* @param {Boolean} silent Whether or not to suppress change events
* @return {Boolean} Whether or not the value was set
*/
resetValue: function(key, silent){
this._configs = this._configs || {};
if (this._configs[key]) {
this.set(key, this._configs[key]._initialConfig.value, silent);
return true;
}
return false;
},
/**
* Sets the attribute's value to its current value.
* @method refresh
* @param {String | Array} key The attribute(s) to refresh
* @param {Boolean} silent Whether or not to suppress change events
*/
refresh: function(key, silent){
this._configs = this._configs;
key = ( ( Lang.isString(key) ) ? [key] : key ) ||
this.getAttributeKeys();
for (var i = 0, len = key.length; i < len; ++i) {
if ( // only set if there is a value and not null
this._configs[key[i]] &&
! Lang.isUndefined(this._configs[key[i]].value) &&
! Lang.isNull(this._configs[key[i]].value) ) {
this._configs[key[i]].refresh(silent);
}
}
},
/**
* Adds an Attribute to the AttributeProvider instance.
* @method register
* @param {String} key The attribute's name
* @param {Object} map A key-value map containing the
* attribute's properties.
* @deprecated Use setAttributeConfig
*/
register: function(key, map) {
this.setAttributeConfig(key, map);
},
/**
* Returns the attribute's properties.
* @method getAttributeConfig
* @param {String} key The attribute's name
* @private
* @return {object} A key-value map containing all of the
* attribute's properties.
*/
getAttributeConfig: function(key) {
this._configs = this._configs || {};
var config = this._configs[key] || {};
var map = {}; // returning a copy to prevent overrides
for (key in config) {
if ( Lang.hasOwnProperty(config, key) ) {
map[key] = config[key];
}
}
return map;
},
/**
* Sets or updates an Attribute instance's properties.
* @method setAttributeConfig
* @param {String} key The attribute's name.
* @param {Object} map A key-value map of attribute properties
* @param {Boolean} init Whether or not this should become the intial config.
*/
setAttributeConfig: function(key, map, init) {
this._configs = this._configs || {};
map = map || {};
if (!this._configs[key]) {
map.name = key;
this._configs[key] = this.createAttribute(map);
} else {
this._configs[key].configure(map, init);
}
},
/**
* Sets or updates an Attribute instance's properties.
* @method configureAttribute
* @param {String} key The attribute's name.
* @param {Object} map A key-value map of attribute properties
* @param {Boolean} init Whether or not this should become the intial config.
* @deprecated Use setAttributeConfig
*/
configureAttribute: function(key, map, init) {
this.setAttributeConfig(key, map, init);
},
/**
* Resets an attribute to its intial configuration.
* @method resetAttributeConfig
* @param {String} key The attribute's name.
* @private
*/
resetAttributeConfig: function(key){
this._configs = this._configs || {};
this._configs[key].resetConfig();
},
// wrapper for EventProvider.subscribe
// to create events on the fly
subscribe: function(type, callback) {
this._events = this._events || {};
if ( !(type in this._events) ) {
this._events[type] = this.createEvent(type);
}
YAHOO.util.EventProvider.prototype.subscribe.apply(this, arguments);
},
on: function() {
this.subscribe.apply(this, arguments);
},
addListener: function() {
this.subscribe.apply(this, arguments);
},
/**
* Fires the attribute's beforeChange event.
* @method fireBeforeChangeEvent
* @param {String} key The attribute's name.
* @param {Obj} e The event object to pass to handlers.
*/
fireBeforeChangeEvent: function(e) {
var type = 'before';
type += e.type.charAt(0).toUpperCase() + e.type.substr(1) + 'Change';
e.type = type;
return this.fireEvent(e.type, e);
},
/**
* Fires the attribute's change event.
* @method fireChangeEvent
* @param {String} key The attribute's name.
* @param {Obj} e The event object to pass to the handlers.
*/
fireChangeEvent: function(e) {
e.type += 'Change';
return this.fireEvent(e.type, e);
},
createAttribute: function(map) {
return new YAHOO.util.Attribute(map, this);
}
};
YAHOO.augment(YAHOO.util.AttributeProvider, YAHOO.util.EventProvider);
})();