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/*
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* Ext JS Library 2.0.2
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* Copyright(c) 2006-2008, Ext JS, LLC.
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* licensing@extjs.com
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*
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* http://extjs.com/license
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*/
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/**
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* @class Ext.ComponentMgr
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* <p>Provides a registry of all Components (specifically subclasses of
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* {@link Ext.Component}) on a page so that they can be easily accessed by
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* component id (see {@link Ext.getCmp}).</p>
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* <p>This object also provides a registry of available Component <i>classes</i>
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* indexed by a mnemonic code known as the Component's {@link Ext.Component#xtype}.
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* The <tt>xtype</tt> provides a way to avoid instantiating child Components
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* when creating a full, nested config object for a complete Ext page.</p>
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* <p>
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* A child Component may be specified simply as a <i>config object</i>
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* as long as the correct xtype is specified so that if and when the Component
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* needs rendering, the correct type can be looked up for lazy instantiation.</p>
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* <p>For a list of all available xtypes, see {@link Ext.Component}.</p>
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* @singleton
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*/
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Ext.ComponentMgr = function(){
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var all = new Ext.util.MixedCollection();
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var types = {};
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return {
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/**
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* Registers a component.
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* @param {Ext.Component} c The component
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*/
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register : function(c){
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all.add(c);
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},
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/**
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* Unregisters a component.
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* @param {Ext.Component} c The component
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*/
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unregister : function(c){
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all.remove(c);
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},
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/**
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* Returns a component by id
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* @param {String} id The component id
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* @return Ext.Component
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*/
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get : function(id){
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return all.get(id);
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},
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/**
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* Registers a function that will be called when a specified component is added to ComponentMgr
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* @param {String} id The component id
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* @param {Function} fn The callback function
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* @param {Object} scope The scope of the callback
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*/
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onAvailable : function(id, fn, scope){
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all.on("add", function(index, o){
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if(o.id == id){
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fn.call(scope || o, o);
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all.un("add", fn, scope);
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}
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});
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},
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/**
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* The MixedCollection used internally for the component cache. An example usage may be subscribing to
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* events on the MixedCollection to monitor addition or removal. Read-only.
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* @type {MixedCollection}
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*/
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all : all,
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/**
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* Registers a new Component constructor, keyed by a new
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* {@link Ext.Component#xtype}.<br><br>
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* Use this method to register new subclasses of {@link Ext.Component} so
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* that lazy instantiation may be used when specifying child Components.
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* see {@link Ext.Container#items}
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* @param {String} xtype The mnemonic string by which the Component class
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* may be looked up.
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* @param {Constructor} cls The new Component class.
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*/
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registerType : function(xtype, cls){
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types[xtype] = cls;
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cls.xtype = xtype;
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},
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// private
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create : function(config, defaultType){
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return new types[config.xtype || defaultType](config);
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}
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};
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}();
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// this will be called a lot internally,
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// shorthand to keep the bytes down
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Ext.reg = Ext.ComponentMgr.registerType;
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