main/addon.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 ////////////////////////////////////////////////////////////////////////////////
  11 const {utils:Cu, classes:Cc, interfaces:Ci, results:Cr} = Components;
  12
  13 let addonobj = null;
  14
  15
  16 ////////////////////////////////////////////////////////////////////////////////
  17 function initAddon (global, addonName, contentUrl, jsUrl, startupCB) {
  18   if (addonobj === null) {
  19     // check arguments
  20     if (typeof(addonName) !== "string" || addonName.length == 0) throw new Error("addon name expected (non-empty string)");
  21     if (typeof(contentUrl) !== "string" || contentUrl.length == 0) throw new Error("content url expected (non-empty string)");
  22     if (contentUrl[contentUrl.length-1] != "/") contentUrl += "/";
  23     if (typeof(jsUrl) === "undefined") jsUrl = contentUrl;
  24     if (typeof(jsUrl) !== "string" || jsUrl.length == 0) throw new Error("js url expected (non-empty string)");
  25     if (typeof(startupCB) === "undefined") startupCB = null;
  26     if (startupCB && typeof(startupCB) !== "function") throw new Error("startup callback expected (function)");
  27
  28     //Components.utils.reportError("ADDON '"+addonName+"': initializing");
  29     // load "mainjs:init.js"
  30     let uri = Cc["@mozilla.org/network/io-service;1"].getService(Ci.nsIIOService).newURI(jsUrl+"init.js", null, null);
  31     let initfn = Cc["@mozilla.org/moz/jssubscript-loader;1"].getService(Ci.mozIJSSubScriptLoader).loadSubScript(uri.spec, this, "UTF-8");
  32     try {
  33       addonobj = initfn(global, addonName, contentUrl, jsUrl);
  34       if (!addonobj) throw new Error("can't init addon '"+addonName+"'"); // alas, something is wrong
  35       if (startupCB) startupCB(addonobj);
  36       addonobj.onStartup();
  37     } catch (e) {
  38       if (addonobj) try { addonobj.onShutdown(); } catch (xx) {}
  39       addonobj = false;
  40       Components.utils.reportError(e.stack);
  41       Components.utils.reportError(e);
  42       throw e;
  43     }
  44   }
  45   if (addonobj) return addonobj;
  46   throw new Error("addon object wasn't initialized");
  47 }
  48
  49
  50 ////////////////////////////////////////////////////////////////////////////////
  51 function getAddonObj () {
  52   if (addonobj) return addonobj;
  53   throw new Error("addon object wasn't initialized");
  54 };
  55
  56
  57 ////////////////////////////////////////////////////////////////////////////////
  58 let windowCount = 0;
  59
  60 function newWindow (global, win) {
  61   if (addonobj) {
  62     win.addEventListener("load", function () {
  63       ++windowCount;
  64       //Components.utils.reportError("NEW WINDOW: "+windowCount);
  65       // setup unload hook
  66       global.window.addEventListener("unload", function () {
  67         --windowCount;
  68         //Components.utils.reportError("DEAD WINDOW: "+windowCount);
  69         addonobj.onWindowUnload(win);
  70         if (windowCount == 0) {
  71           // no more registered windows --> shutdown
  72           //Components.utils.reportError("SHUTTING DOWN!");
  73           addonobj.onShutdown();
  74         }
  75       }, false);
  76       addonobj.onWindowLoad(win);
  77     }, false);
  78   }
  79 }
  80
  81 ////////////////////////////////////////////////////////////////////////////////
  82 let EXPORTED_SYMBOLS = ["initAddon", "getAddonObj", "newWindow"];