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FCKeditor/editor/_source/classes/fckimagepreloader.js

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+/*
+ * FCKeditor - The text editor for Internet - http://www.fckeditor.net
+ * Copyright (C) 2003-2007 Frederico Caldeira Knabben
+ *
+ * == BEGIN LICENSE ==
+ *
+ * Licensed under the terms of any of the following licenses at your
+ * choice:
+ *
+ *  - GNU General Public License Version 2 or later (the "GPL")
+ *    http://www.gnu.org/licenses/gpl.html
+ *
+ *  - GNU Lesser General Public License Version 2.1 or later (the "LGPL")
+ *    http://www.gnu.org/licenses/lgpl.html
+ *
+ *  - Mozilla Public License Version 1.1 or later (the "MPL")
+ *    http://www.mozilla.org/MPL/MPL-1.1.html
+ *
+ * == END LICENSE ==
+ *
+ * Preload a list of images, firing an event when complete.
+ */
+
+var FCKImagePreloader = function()
+{
+	this._Images = new Array() ;
+}
+
+FCKImagePreloader.prototype =
+{
+	AddImages : function( images )
+	{
+		if ( typeof( images ) == 'string' )
+			images = images.split( ';' ) ;
+
+		this._Images = this._Images.concat( images ) ;
+	},
+
+	Start : function()
+	{
+		var aImages = this._Images ;
+		this._PreloadCount = aImages.length ;
+
+		for ( var i = 0 ; i < aImages.length ; i++ )
+		{
+			var eImg = document.createElement( 'img' ) ;
+			FCKTools.AddEventListenerEx( eImg, 'load', _FCKImagePreloader_OnImage, this ) ;
+			FCKTools.AddEventListenerEx( eImg, 'error', _FCKImagePreloader_OnImage, this ) ;
+			eImg.src = aImages[i] ;
+
+			_FCKImagePreloader_ImageCache.push( eImg ) ;
+		}
+	}
+};
+
+// All preloaded images must be placed in a global array, otherwise the preload
+// magic will not happen.
+var _FCKImagePreloader_ImageCache = new Array() ;
+
+function _FCKImagePreloader_OnImage( ev, imagePreloader )
+{
+	if ( (--imagePreloader._PreloadCount) == 0 && imagePreloader.OnComplete )
+		imagePreloader.OnComplete() ;
+}