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

lib/ui.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 1582 matching lines @@
     hideElement(prefix + "contributebutton", Prefs.hideContributeButton);
   },
 
   /**
    * Adds Adblock Plus menu items to the content area context menu when it shows
    * up.
    */
   fillContentContextMenu: function(/**Element*/ popup)
   {
     let window = popup.ownerDocument.defaultView;
-    if (!window.gContextMenuContentData ||
-      typeof window.gContextMenuContentData.addonInfo != "object" ||
-      typeof window.gContextMenuContentData.addonInfo.adblockplus != "object")
+    let data = window.gContextMenuContentData;
+    if (!data)
     {
-      return;
+      // This is SeaMonkey Mail or Thunderbird, they won't get context menu data
+      // for us. Send the notification ourselves.
+      let event = new Event("contextmenu");
+      Object.defineProperty(event, "target", {"get": () => popup.triggerNode});
+      data = {
+        event: event,
+        addonInfo: {},
+        get wrappedJSObject() {return this;}
+      };
+      Services.obs.notifyObservers(data, "content-contextmenu", null);

[Wladimir Palant, 2015/12/02 11:21:46]

I thought a bit more about this and it's probably better to send out our own
notification here. This way, if the semantics of the (currently undocumented)
built-in content-contextmenu notification change we won't end up breaking
anybody by sending the notification incorrectly.

     }
 
-    let items = window.gContextMenuContentData.addonInfo.adblockplus;
+    if (typeof data.addonInfo != "object" || typeof data.addonInfo.adblockplus != "object")
+      return;
+
+    let items = data.addonInfo.adblockplus;
     let clicked = null;
     let menuItems = [];
 
     function menuItemTriggered(id, nodeData)
     {
       clicked = id;
       this.blockItem(window, id, nodeData);
     }
 
     for (let [id, nodeData] of items)
@@ skipping 266 matching lines @@
   ["abp-command-contribute-hide", "command", UI.hideContributeButton.bind(UI)],
   ["abp-command-toggleshownotifications", "command", Notification.toggleIgnoreCategory.bind(Notification, "*", null)]
 ];
 
 onShutdown.add(function()
 {
   for (let window of UI.applicationWindows)
     if (UI.isBottombarOpen(window))
       UI.toggleBottombar(window);
 });