www.gusucode.com > 一个基于extjs的强大聊天插件源码程序 > 一个基于extjs的强大聊天插件/extjame/ext-jame/js/ext2/source/widgets/ComponentMgr.js
/* * Ext JS Library 2.0.2 * Copyright(c) 2006-2008, Ext JS, LLC. * licensing@extjs.com * * http://extjs.com/license */ /** * @class Ext.ComponentMgr * <p>Provides a registry of all Components (specifically subclasses of * {@link Ext.Component}) on a page so that they can be easily accessed by * component id (see {@link Ext.getCmp}).</p> * <p>This object also provides a registry of available Component <i>classes</i> * indexed by a mnemonic code known as the Component's {@link Ext.Component#xtype}. * The <tt>xtype</tt> provides a way to avoid instantiating child Components * when creating a full, nested config object for a complete Ext page.</p> * <p> * A child Component may be specified simply as a <i>config object</i> * as long as the correct xtype is specified so that if and when the Component * needs rendering, the correct type can be looked up for lazy instantiation.</p> * <p>For a list of all available xtypes, see {@link Ext.Component}.</p> * @singleton */ Ext.ComponentMgr = function(){ var all = new Ext.util.MixedCollection(); var types = {}; return { /** * Registers a component. * @param {Ext.Component} c The component */ register : function(c){ all.add(c); }, /** * Unregisters a component. * @param {Ext.Component} c The component */ unregister : function(c){ all.remove(c); }, /** * Returns a component by id * @param {String} id The component id * @return Ext.Component */ get : function(id){ return all.get(id); }, /** * Registers a function that will be called when a specified component is added to ComponentMgr * @param {String} id The component id * @param {Function} fn The callback function * @param {Object} scope The scope of the callback */ onAvailable : function(id, fn, scope){ all.on("add", function(index, o){ if(o.id == id){ fn.call(scope || o, o); all.un("add", fn, scope); } }); }, /** * The MixedCollection used internally for the component cache. An example usage may be subscribing to * events on the MixedCollection to monitor addition or removal. Read-only. * @type {MixedCollection} */ all : all, /** * Registers a new Component constructor, keyed by a new * {@link Ext.Component#xtype}.<br><br> * Use this method to register new subclasses of {@link Ext.Component} so * that lazy instantiation may be used when specifying child Components. * see {@link Ext.Container#items} * @param {String} xtype The mnemonic string by which the Component class * may be looked up. * @param {Constructor} cls The new Component class. */ registerType : function(xtype, cls){ types[xtype] = cls; cls.xtype = xtype; }, // private create : function(config, defaultType){ return new types[config.xtype || defaultType](config); } }; }(); // this will be called a lot internally, // shorthand to keep the bytes down Ext.reg = Ext.ComponentMgr.registerType;