ComponentMgr.js
/**
* @class Ext.ComponentMgr
* <p>Provides a registry of all Components (instances of {@link Ext.Component} or any subclass
* thereof) on a page so that they can be easily accessed by component id (see {@link #get}, or
* the convenience method {@link Ext#getCmp 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 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,
/**
* <p>Registers a new Component constructor, keyed by a new
* {@link Ext.Component#xtype}.</p>
* <p>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}</p>
* @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;
},
/**
* Creates a new Component from the specified config object using the
* config object's {@link Ext.component#xtype xtype} to determine the class to instantiate.
* @param {Object} config A configuration object for the Component you wish to create.
* @param {Constructor} defaultType The constructor to provide the default Component type if
* the config object does not contain an xtype. (Optional if the config contains an xtype).
* @return {Ext.Component} The newly instantiated Component.
*/
create : function(config, defaultType){
return new types[config.xtype || defaultType](config);
}
};
}();
/**
* Shorthand for {@link Ext.ComponentMgr#registerType}
* @param {String} xtype The mnemonic string by which the Component class
* may be looked up.
* @param {Constructor} cls The new Component class.
* @member Ext
* @method reg
*/
Ext.reg = Ext.ComponentMgr.registerType; // this will be called a lot internally, shorthand to keep the bytes down
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