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 const iosvc = Cc["@mozilla.org/network/io-service;1"].getService(Ci.nsIIOService);
  25
  26
  27 //////////////////////////////////////////////////////////////////////////////
  28 function expungeImageCache (el, url) {
  29   if (!el || typeof(el.tagName) !== "string" || el.tagName !== "IMG") {
  30     if (PREFS.debugLog) conlog("WTF! ["+url+"] is not an image!");
  31     return;
  32   }
  33   try {
  34     //if (PREFS.debugLog) conlog(" converting URL=[", url, "]...");
  35     //let ourl = url;
  36     //let uri = iosvc.newURI(url, null, null);
  37     //let url = uri.spec;
  38     //if (PREFS.debugLog) conlog(" URL=[", ourl, "]; URI=[", url, "]");
  39     let tools = Cc["@mozilla.org/image/tools;1"].getService(Ci.imgITools);
  40     let cache = tools.getImgCacheForDocument(el.ownerDocument);
  41     if (cache) {
  42       if (url === undefined) {
  43         url = el.getAttribute("src");
  44         if (PREFS.debugLog) conlog(" got URL from image: URL=[", url, "]...");
  45       }
  46       if (typeof(url) === "string") {
  47         if (PREFS.debugLog) conlog(" converting URL=[", url, "] to URI");
  48         let baseURI = null;
  49         try {
  50           if (PREFS.debugLog) conlog(" docURI=[", el.ownerDocument.documentURI, "]");
  51           baseURI = iosvc.newURI(el.ownerDocument.documentURI, null, null);
  52           if (PREFS.debugLog) conlog(" BASE=[", baseURI.spec, "]");
  53         } catch (e) {}
  54         url = iosvc.newURI(url, null, baseURI);
  55       }
  56       if (PREFS.debugLog) conlog("got cache object for image with url ", url.spec);
  57       try {
  58         cache.removeEntry(url);
  59       } catch (e) {
  60         if (PREFS.debugLog) conlog(" error clearing cache for image with url ", url.spec);
  61         if (PREFS.debugLog) logException("cache error", e);
  62       }
  63     } else {
  64       if (PREFS.debugLog) conlog("CAN'T get cache object for document");
  65     }
  66   } catch (e) {
  67     if (PREFS.debugLog) conlog(" some error occuren when clearing cache for image with url ", el.src);
  68     if (PREFS.debugLog) logException("unknown cache error", e);
  69   }
  70 }
  71
  72
  73 //////////////////////////////////////////////////////////////////////////////
  74 let reloadUrlList = {};
  75
  76
  77 function reloadImage (el) {
  78   if (el instanceof Ci.nsIImageLoadingContent) {
  79     if (PREFS.debugLog) conlog("forcing reload!");
  80     let src = el.getAttribute("src");
  81     reloadUrlList[src] = true;
  82     expungeImageCache(el);
  83     oneShotTimer(function () { delete reloadUrlList[src]; }, 500);
  84     // and for all images in document
  85     for (let img of el.ownerDocument.querySelectorAll("img[src]")) {
  86       if (img.getAttribute("src") === src) {
  87         if (img instanceof Ci.nsIImageLoadingContent) {
  88           try {
  89             img.forceReload();
  90           } catch (e) {
  91             if (PREFS.debugLog) logException("reload error", e);
  92           }
  93         }
  94       }
  95     }
  96   } else {
  97     if (PREFS.debugLog) conlog("alas...");
  98   }
  99 }