/**
* @class Ext.ComponentMgr
*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 {@link Ext.Component component}
* {@link Ext.Component#id id} (see {@link #get}, or the convenience method {@link Ext#getCmp Ext.getCmp}).
*This object also provides a registry of available Component classes
* indexed by a mnemonic code known as the Component's {@link Ext.Component#xtype xtype}.
* The {@link Ext.Component#xtype xtype} provides a way to avoid instantiating child Components
* when creating a full, nested config object for a complete Ext page.
*A child Component may be specified simply as a config object
* as long as the correct {@link Ext.Component#xtype xtype} is specified so that if and when the Component
* needs rendering, the correct type can be looked up for lazy instantiation.
*For a list of all available {@link Ext.Component#xtype xtypes}, see {@link Ext.Component}.
* @singleton
*/
Ext.ComponentMgr = function(){
var all = new Ext.util.MixedCollection();
var types = {};
var ptypes = {};
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 {@link Ext.Component#id id}.
* For additional details see {@link Ext.util.MixedCollection#get}.
* @param {String} id The component {@link Ext.Component#id id}
* @return Ext.Component The Component, undefined if not found, or null if a
* Class was found.
*/
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 {@link Ext.Component#id 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,
/**
* Checks if a Component type is registered.
* @param {Ext.Component} xtype The mnemonic string by which the Component class may be looked up
* @return {Boolean} Whether the type is registered.
*/
isRegistered : function(xtype){
return types[xtype] !== undefined;
},
/**
*Registers a new Component constructor, keyed by a new
* {@link Ext.Component#xtype}.
*Use this method (or its alias {@link Ext#reg Ext.reg}) 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;
},
/**
* 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 a xtype. (Optional if the config contains a xtype).
* @return {Ext.Component} The newly instantiated Component.
*/
create : function(config, defaultType){
return config.render ? config : new types[config.xtype || defaultType](config);
},
/**
*Registers a new Plugin constructor, keyed by a new
* {@link Ext.Component#ptype}.
*Use this method (or its alias {@link Ext#preg Ext.preg}) to register new
* plugins for {@link Ext.Component}s so that lazy instantiation may be used when specifying
* Plugins.
* @param {String} ptype The mnemonic string by which the Plugin class may be looked up.
* @param {Constructor} cls The new Plugin class.
*/
registerPlugin : function(ptype, cls){
ptypes[ptype] = cls;
cls.ptype = ptype;
},
/**
* Creates a new Plugin from the specified config object using the
* config object's {@link Ext.component#ptype ptype} to determine the class to instantiate.
* @param {Object} config A configuration object for the Plugin you wish to create.
* @param {Constructor} defaultType The constructor to provide the default Plugin type if
* the config object does not contain a ptype. (Optional if the config contains a ptype).
* @return {Ext.Component} The newly instantiated Plugin.
*/
createPlugin : function(config, defaultType){
return new ptypes[config.ptype || defaultType](config);
}
};
}();
/**
* Shorthand for {@link Ext.ComponentMgr#registerType}
* @param {String} xtype The {@link Ext.component#xtype 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
/**
* Shorthand for {@link Ext.ComponentMgr#registerPlugin}
* @param {String} ptype The {@link Ext.component#ptype mnemonic string} by which the Plugin class
* may be looked up.
* @param {Constructor} cls The new Plugin class.
* @member Ext
* @method preg
*/
Ext.preg = Ext.ComponentMgr.registerPlugin;
Ext.create = Ext.ComponentMgr.create;