build/imageloader/imageloader-beta.js

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/*
Copyright (c) 2007, Yahoo! Inc. All rights reserved.
Code licensed under the BSD License:
http://developer.yahoo.net/yui/license.txt
version: 2.4.0
*/
/**
 * The image loader is a framework to dynamically load images
 * according to certain triggers, enabling faster load times
 * and a more responsive UI.
 *
 * @module imageloader
 * @namespace YAHOO.util
 * @experimental
 */

if (typeof(YAHOO.util.ImageLoader) == 'undefined') {
	YAHOO.util.ImageLoader = {};
}

/**
 * A group for images. A group can have one time limit and a series of triggers. Thus the images belonging to this group must share these constraints.
 * @class YAHOO.util.ImageLoader.group
 * @requires YAHOO.util.Dom
 * @requires YAHOO.util.Event
 * @constructor
 * @param {String|HTMLElement}	trigEl	The HTML element id or reference to assign the trigger event to. Can be null for no trigger
 * @param {String}	trigAct The type of event to assign to trigEl. Can be null for no trigger
 * @param {Number}	timeout	Timeout (time limit) length, in seconds. Can be undefined, or <= 0, for no time limit
 */
YAHOO.util.ImageLoader.group = function(trigEl, trigAct, timeout) {
	/**
	 * Name for the group. Only used to identify the group in logging statements
	 * @property name
	 * @type String
	 */
	this.name = 'unnamed';
	
	/**
	 * Collection of images registered with this group
	 * @property _imgObjs
	 * @private
	 * @type Object
	 */
	this._imgObjs = {};
	
	/**
	 * Timeout (time limit) length, in seconds
	 * @property timeoutLen
	 * @type Number
	 */
	this.timeoutLen = timeout;
	
	/**
	 * Timeout object to keep a handle on the time limit
	 * @property _timeout
	 * @private
	 * @type Object
	 */
	this._timeout = null;