code/modules/imgreload.js

   1 /* coded by Ketmar // Invisible Vector (psyc://ketmar.no-ip.org/~Ketmar)
   2  * Understanding is not required. Only obedience.
   3  *
   4  * This program is free software. It comes without any warranty, to
   5  * the extent permitted by applicable law. You can redistribute it
   6  * and/or modify it under the terms of the Do What The Fuck You Want
   7  * To Public License, Version 2, as published by Sam Hocevar. See
   8  * http://www.wtfpl.net/txt/copying/ for more details.
   9  */
  10 // reload image
  11 let EXPORTED_SYMBOLS = [
  12   "reloadImage",
  13   "reloadUrlList"
  14 ];
  15
  16 const {utils:Cu, classes:Cc, interfaces:Ci, results:Cr} = Components;
  17
  18
  19 //////////////////////////////////////////////////////////////////////////////
  20 Cu.import("chrome://k8-imago-code/content/modules/utils.js");
  21 Cu.import(MODULE_PATH+"debuglog.js");
  22 Cu.import(MODULE_PATH+"prefs.js");
  23
  24
  25 //////////////////////////////////////////////////////////////////////////////
  26 function expungeImageCache (el, url) {
  27   if (!el || typeof(el.tagName) !== "string" || el.tagName !== "IMG") return;
  28   try {
  29     let tools = Cc["@mozilla.org/image/tools;1"].getService(Ci.imgITools);
  30     let cache = tools.getImgCacheForDocument(el.ownerDocument);
  31     if (cache) {
  32       if (url === undefined) url = el.getAttribute("src");
  33       if (typeof(url) === "string") url = url2uri(url);
  34       conlog("got cache object for image with url ", url.spec);
  35       try {
  36         cache.removeEntry(url);
  37       } catch (e) {
  38         conlog(" error clearing cache for image with url ", el.src);
  39         if (PREFS.debugLog) logException("cache error", e);
  40       }
  41     }
  42   } catch (e) {}
  43 }
  44
  45
  46 //////////////////////////////////////////////////////////////////////////////
  47 let reloadUrlList = {};
  48
  49
  50 function reloadImage (el) {
  51   if (el instanceof Ci.nsIImageLoadingContent) {
  52     conlog("forcing reload!");
  53     let src = el.getAttribute("src");
  54     expungeImageCache(el);
  55     reloadUrlList[src] = true;
  56     oneShotTimer(function () { delete reloadUrlList[src]; }, 500);
  57     // and for all images in document
  58     for (let img of el.ownerDocument.querySelectorAll("img[src]")) {
  59       if (img.getAttribute("src") === src) {
  60         if (img instanceof Ci.nsIImageLoadingContent) {
  61           try {
  62             img.forceReload();
  63           } catch (e) {
  64             logException("reload error", e);
  65           }
  66         }
  67       }
  68     }
  69   } else {
  70     conlog("alas...");
  71   }
  72 }