_source/core/imagecacher.js

   1 /*\r
   2 Copyright (c) 2003-2009, 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                                 loaded[ image ] = 1;\r
  15                                 callback();\r
  16                         };\r
  17 \r
  18                 var img = new CKEDITOR.dom.element( 'img' );\r
  19                 img.on( 'load', doCallback );\r
  20                 img.on( 'error', doCallback );\r
  21                 img.setAttribute( 'src', image );\r
  22         };\r
  23 \r
  24         /**\r
  25          * Load images into the browser cache.\r
  26          * @namespace\r
  27          * @example\r
  28          */\r
  29         CKEDITOR.imageCacher =\r
  30         {\r
  31                 /**\r
  32                  * Loads one or more images.\r
  33                  * @param {Array} images The URLs for the images to be loaded.\r
  34                  * @param {Function} callback The function to be called once all images\r
  35                  *              are loaded.\r
  36                  */\r
  37                 load : function( images, callback )\r
  38                 {\r
  39                         var pendingCount = images.length;\r
  40 \r
  41                         var checkPending = function()\r
  42                         {\r
  43                                 if ( --pendingCount === 0 )\r
  44                                         callback();\r
  45                         };\r
  46 \r
  47                         for ( var i = 0 ; i < images.length ; i++ )\r
  48                         {\r
  49                                 var image = images[ i ];\r
  50 \r
  51                                 if ( loaded[ image ] )\r
  52                                         checkPending();\r
  53                                 else\r
  54                                         loadImage( image, checkPending );\r
  55                         }\r
  56                 }\r
  57         };\r
  58 })();\r