1/*
2 * FCKeditor - The text editor for Internet - http://www.fckeditor.net
3 * Copyright (C) 2003-2007 Frederico Caldeira Knabben
4 *
5 * == BEGIN LICENSE ==
6 *
7 * Licensed under the terms of any of the following licenses at your
8 * choice:
9 *
10 *  - GNU General Public License Version 2 or later (the "GPL")
11 *    http://www.gnu.org/licenses/gpl.html
12 *
13 *  - GNU Lesser General Public License Version 2.1 or later (the "LGPL")
14 *    http://www.gnu.org/licenses/lgpl.html
15 *
16 *  - Mozilla Public License Version 1.1 or later (the "MPL")
17 *    http://www.mozilla.org/MPL/MPL-1.1.html
18 *
19 * == END LICENSE ==
20 *
21 * Preload a list of images, firing an event when complete.
22 */
23
24var FCKImagePreloader = function()
25{
26	this._Images = new Array() ;
27}
28
29FCKImagePreloader.prototype =
30{
31	AddImages : function( images )
32	{
33		if ( typeof( images ) == 'string' )
34			images = images.split( ';' ) ;
35
36		this._Images = this._Images.concat( images ) ;
37	},
38
39	Start : function()
40	{
41		var aImages = this._Images ;
42		this._PreloadCount = aImages.length ;
43
44		for ( var i = 0 ; i < aImages.length ; i++ )
45		{
46			var eImg = document.createElement( 'img' ) ;
47			FCKTools.AddEventListenerEx( eImg, 'load', _FCKImagePreloader_OnImage, this ) ;
48			FCKTools.AddEventListenerEx( eImg, 'error', _FCKImagePreloader_OnImage, this ) ;
49			eImg.src = aImages[i] ;
50
51			_FCKImagePreloader_ImageCache.push( eImg ) ;
52		}
53	}
54};
55
56// All preloaded images must be placed in a global array, otherwise the preload
57// magic will not happen.
58var _FCKImagePreloader_ImageCache = new Array() ;
59
60function _FCKImagePreloader_OnImage( ev, imagePreloader )
61{
62	if ( (--imagePreloader._PreloadCount) == 0 && imagePreloader.OnComplete )
63		imagePreloader.OnComplete() ;
64}