flymis/WebRoot/dojojs/src/event/topic.js

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/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/

dojo.require("dojo.event.common");
dojo.provide("dojo.event.topic");

dojo.event.topic = new function(){
	this.topics = {};

	this.getTopic = function(/*String*/topic){
		// summary:
		//		returns a topic implementation object of type
		//		dojo.event.topic.TopicImpl
		// topic:
		//		a unique, opaque string that names the topic
		if(!this.topics[topic]){
			this.topics[topic] = new this.TopicImpl(topic);
		}
		return this.topics[topic]; // a dojo.event.topic.TopicImpl object
	}

	this.registerPublisher = function(/*String*/topic, /*Object*/obj, /*String*/funcName){
		// summary:
		//		registers a function as a publisher on a topic. Subsequent
		//		calls to the function will cause a publish event on the topic
		//		with the arguments passed to the function passed to registered
		//		listeners.
		// topic: 
		//		a unique, opaque string that names the topic
		// obj:
		//		the scope to locate the function in
		// funcName:
		//		the name of the function to register
		var topic = this.getTopic(topic);
		topic.registerPublisher(obj, funcName);
	}

	this.subscribe = function(/*String*/topic, /*Object*/obj, /*String*/funcName){
		// summary:
		//		susbscribes the function to the topic. Subsequent events
		//		dispached to the topic will create a function call for the
		//		obj.funcName() function.
		// topic: 
		//		a unique, opaque string that names the topic
		// obj:
		//		the scope to locate the function in
		// funcName:
		//		the name of the function to being registered as a listener
		var topic = this.getTopic(topic);
		topic.subscribe(obj, funcName);
	}

	this.unsubscribe = function(/*String*/topic, /*Object*/obj, /*String*/funcName){