Issue 3223 - Implement context menu fallback for SeaMonkey Mail and Thunderbird

lib/child/contextMenu.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2015 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 15 matching lines @@
 
 /**
  * Determines the context menu entries to be shown for a contextmenu event.
  * @param {Event} event
  * @return {Array}
  */
 function getContextInfo(event)
 {
   let items = [];
   let target = event.target;
   if (target.localName == "menupopup" && target.triggerNode)

[tschuster, 2015/12/02 12:14:17]

Is this still needed now?

[Wladimir Palant, 2015/12/02 12:20:54]

Yes, it is. That's SeaMonkey sending the content-contextmenu notification,
triggered by SeaMonkey's browser code. For the mail client we are sending our
own notification - there it isn't necessary.

   {
     // SeaMonkey gives us the context menu's popupshowing event
     target = target.triggerNode;
   }
   if (target instanceof Ci.nsIDOMHTMLMapElement || target instanceof Ci.nsIDOMHTMLAreaElement)
   {
     // HTML image maps will usually receive events when the mouse pointer is
     // over a different element, get the real event target.
     let rect = target.getClientRects()[0];
     target = target.ownerDocument.elementFromPoint(Math.max(rect.left, 0), Math.max(rect.top, 0));
@@ skipping 66 matching lines @@
     }
   }
 
   return items;
 };
 
 let ContextMenuObserver =
 {
   observe: function(subject, topic, data)
   {
-    if (topic == "content-contextmenu")
-    {
-      if (subject.wrappedJSObject)
-        subject = subject.wrappedJSObject;
+    if (subject.wrappedJSObject)
+      subject = subject.wrappedJSObject;
 
-      if (subject.addonInfo)
-        subject.addonInfo.adblockplus = getContextInfo(subject.event);
-    }
+    if (subject.addonInfo)
+      subject.addonInfo.adblockplus = getContextInfo(subject.event);
   },
   QueryInterface: XPCOMUtils.generateQI([Ci.nsISupportsWeakReference, Ci.nsIObserver])
 };
 
 let addObserver = Utils.getPropertyWithoutCompatShims(Services.obs, "addObserver");
 addObserver.call(Services.obs, ContextMenuObserver, "content-contextmenu", true);
+addObserver.call(Services.obs, ContextMenuObserver, "AdblockPlus:content-contextmenu", true);
 onShutdown.add(() => {
   let removeObserver = Utils.getPropertyWithoutCompatShims(Services.obs, "removeObserver");
   removeObserver.call(Services.obs, ContextMenuObserver, "content-contextmenu");
+  removeObserver.call(Services.obs, ContextMenuObserver, "AdblockPlus:content-contextmenu");
 });