_source/core/imagecacher.js

   1 /*\r
   2 Copyright (c) 2003-2010, CKSource - Frederico Knabben. All rights reserved.\r
   3 For licensing, see LICENSE.html or http://ckeditor.com/license\r
   4 */\r
   5 \r
   6 (function()\r
   7 {\r
   8         var loaded = {};\r
   9 \r
  10         var loadImage = function( image, callback )\r
  11         {\r
  12                 var doCallback = function()\r
  13                         {\r
  14                                 img.removeAllListeners();\r
  15                                 loaded[ image ] = 1;\r
  16                                 callback();\r
  17                         };\r
  18 \r
  19                 var img = new CKEDITOR.dom.element( 'img' );\r
  20                 img.on( 'load', doCallback );\r
  21                 img.on( 'error', doCallback );\r
  22                 img.setAttribute( 'src', image );\r
  23         };\r
  24 \r
  25         /**\r
  26          * @namespace Load images into the browser cache.\r
  27          */\r
  28         CKEDITOR.imageCacher =\r
  29         {\r
  30                 /**\r
  31                  * Loads one or more images.\r
  32                  * @param {Array} images The URLs of the images to be loaded.\r
  33                  * @param {Function} [callback] A function to be called once all images\r
  34                  *              are loaded.\r
  35                  * @return {CKEDITOR.event} An event object which fires the 'loaded'\r
  36                  *              event when all images are completely loaded. Additionally, the\r
  37                  *              "finished" property is set after the "loaded" event call.\r
  38                  * @example\r
  39                  * var loader = CKEDITOR.imageCacher.load( [ '/image1.png', 'image2.png' ] );\r
  40                  * if ( !loader.finished )\r
  41                  * {\r
  42                  *     loader.on( 'load', function()\r
  43                  *         {\r
  44                  *             alert( 'All images are loaded' );\r
  45                  *         });\r
  46                  * }\r
  47                  */\r
  48                 load : function( images, callback )\r
  49                 {\r
  50                         var pendingCount = images.length;\r
  51 \r
  52                         var event = new CKEDITOR.event;\r
  53                         event.on( 'loaded', function()\r
  54                                 {\r
  55                                         event.finished = 1;\r
  56                                 });\r
  57 \r
  58                         if ( callback )\r
  59                                 event.on( 'loaded', callback );\r
  60 \r
  61                         var checkPending = function()\r
  62                                 {\r
  63                                         if ( --pendingCount === 0 )\r
  64                                                 event.fire( 'loaded' );\r
  65                                 };\r
  66 \r
  67                         for ( var i = 0 ; i < images.length ; i++ )\r
  68                         {\r
  69                                 var image = images[ i ];\r
  70 \r
  71                                 if ( loaded[ image ] )\r
  72                                         checkPending();\r
  73                                 else\r
  74                                         loadImage( image, checkPending );\r
  75                         }\r
  76 \r
  77                         return event;\r
  78                 }\r
  79         };\r
  80 })();\r