diff -r 000000000000 -r 6474c204b198 widget/cocoa/nsMenuGroupOwnerX.mm
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widget/cocoa/nsMenuGroupOwnerX.mm	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,244 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsMenuGroupOwnerX.h"
+#include "nsMenuBarX.h"
+#include "nsMenuX.h"
+#include "nsMenuItemX.h"
+#include "nsMenuUtilsX.h"
+#include "nsCocoaUtils.h"
+#include "nsCocoaWindow.h"
+
+#include "nsCOMPtr.h"
+#include "nsString.h"
+#include "nsObjCExceptions.h"
+#include "nsThreadUtils.h"
+
+#include "mozilla/dom/Element.h"
+#include "nsIWidget.h"
+#include "nsIDocument.h"
+#include "nsIDOMDocument.h"
+#include "nsIDOMElement.h"
+
+#include "nsINode.h"
+
+using namespace mozilla;
+
+NS_IMPL_ISUPPORTS(nsMenuGroupOwnerX, nsIMutationObserver)
+
+
+nsMenuGroupOwnerX::nsMenuGroupOwnerX()
+: mCurrentCommandID(eCommand_ID_Last),
+  mDocument(nullptr)
+{
+}
+
+
+nsMenuGroupOwnerX::~nsMenuGroupOwnerX()
+{
+  // make sure we unregister ourselves as a document observer
+  if (mDocument)
+    mDocument->RemoveMutationObserver(this);
+}
+
+
+nsresult nsMenuGroupOwnerX::Create(nsIContent* aContent)
+{
+  if (!aContent)
+    return NS_ERROR_INVALID_ARG;
+
+  mContent = aContent;
+
+  nsIDocument* doc = aContent->OwnerDoc();
+  if (!doc)
+    return NS_ERROR_FAILURE;
+  doc->AddMutationObserver(this);
+  mDocument = doc;
+
+  return NS_OK;
+}
+
+
+//
+// nsIMutationObserver
+//
+
+
+void nsMenuGroupOwnerX::CharacterDataWillChange(nsIDocument* aDocument,
+                                                nsIContent* aContent,
+                                                CharacterDataChangeInfo* aInfo)
+{
+}
+
+
+void nsMenuGroupOwnerX::CharacterDataChanged(nsIDocument* aDocument,
+                                             nsIContent* aContent,
+                                             CharacterDataChangeInfo* aInfo)
+{
+}
+
+
+void nsMenuGroupOwnerX::ContentAppended(nsIDocument* aDocument,
+                                        nsIContent* aContainer,
+                                        nsIContent* aFirstNewContent,
+                                        int32_t /* unused */)
+{
+  for (nsIContent* cur = aFirstNewContent; cur; cur = cur->GetNextSibling()) {
+    ContentInserted(aDocument, aContainer, cur, 0);
+  }
+}
+
+
+void nsMenuGroupOwnerX::NodeWillBeDestroyed(const nsINode * aNode)
+{
+  // our menu bar node is being destroyed
+  mDocument = nullptr;
+}
+
+
+void nsMenuGroupOwnerX::AttributeWillChange(nsIDocument* aDocument,
+                                            dom::Element* aContent,
+                                            int32_t aNameSpaceID,
+                                            nsIAtom* aAttribute,
+                                            int32_t aModType)
+{
+}
+
+
+void nsMenuGroupOwnerX::AttributeChanged(nsIDocument* aDocument,
+                                         dom::Element* aElement,
+                                         int32_t aNameSpaceID,
+                                         nsIAtom* aAttribute,
+                                         int32_t aModType)
+{
+  nsCOMPtr<nsIMutationObserver> kungFuDeathGrip(this);
+  nsChangeObserver* obs = LookupContentChangeObserver(aElement);
+  if (obs)
+    obs->ObserveAttributeChanged(aDocument, aElement, aAttribute);
+}
+
+
+void nsMenuGroupOwnerX::ContentRemoved(nsIDocument * aDocument,
+                                       nsIContent * aContainer,
+                                       nsIContent * aChild,
+                                       int32_t aIndexInContainer,
+                                       nsIContent * aPreviousSibling)
+{
+  if (!aContainer) {
+    return;
+  }
+
+  nsCOMPtr<nsIMutationObserver> kungFuDeathGrip(this);
+  nsChangeObserver* obs = LookupContentChangeObserver(aContainer);
+  if (obs)
+    obs->ObserveContentRemoved(aDocument, aChild, aIndexInContainer);
+  else if (aContainer != mContent) {
+    // We do a lookup on the parent container in case things were removed
+    // under a "menupopup" item. That is basically a wrapper for the contents
+    // of a "menu" node.
+    nsCOMPtr<nsIContent> parent = aContainer->GetParent();
+    if (parent) {
+      obs = LookupContentChangeObserver(parent);
+      if (obs)
+        obs->ObserveContentRemoved(aDocument, aChild, aIndexInContainer);
+    }
+  }
+}
+
+
+void nsMenuGroupOwnerX::ContentInserted(nsIDocument * aDocument,
+                                        nsIContent * aContainer,
+                                        nsIContent * aChild,
+                                        int32_t /* unused */)
+{
+  if (!aContainer) {
+    return;
+  }
+
+  nsCOMPtr<nsIMutationObserver> kungFuDeathGrip(this);
+  nsChangeObserver* obs = LookupContentChangeObserver(aContainer);
+  if (obs)
+    obs->ObserveContentInserted(aDocument, aContainer, aChild);
+  else if (aContainer != mContent) {
+    // We do a lookup on the parent container in case things were removed
+    // under a "menupopup" item. That is basically a wrapper for the contents
+    // of a "menu" node.
+    nsCOMPtr<nsIContent> parent = aContainer->GetParent();
+    if (parent) {
+      obs = LookupContentChangeObserver(parent);
+      if (obs)
+        obs->ObserveContentInserted(aDocument, aContainer, aChild);
+    }
+  }
+}
+
+
+void nsMenuGroupOwnerX::ParentChainChanged(nsIContent *aContent)
+{
+}
+
+
+// For change management, we don't use a |nsSupportsHashtable| because
+// we know that the lifetime of all these items is bounded by the
+// lifetime of the menubar. No need to add any more strong refs to the
+// picture because the containment hierarchy already uses strong refs.
+void nsMenuGroupOwnerX::RegisterForContentChanges(nsIContent *aContent,
+                                                  nsChangeObserver *aMenuObject)
+{
+  mContentToObserverTable.Put(aContent, aMenuObject);
+}
+
+
+void nsMenuGroupOwnerX::UnregisterForContentChanges(nsIContent *aContent)
+{
+  mContentToObserverTable.Remove(aContent);
+}
+
+
+nsChangeObserver* nsMenuGroupOwnerX::LookupContentChangeObserver(nsIContent* aContent)
+{
+  nsChangeObserver * result;
+  if (mContentToObserverTable.Get(aContent, &result))
+    return result;
+  else
+    return nullptr;
+}
+
+
+// Given a menu item, creates a unique 4-character command ID and
+// maps it to the item. Returns the id for use by the client.
+uint32_t nsMenuGroupOwnerX::RegisterForCommand(nsMenuItemX* inMenuItem)
+{
+  // no real need to check for uniqueness. We always start afresh with each
+  // window at 1. Even if we did get close to the reserved Apple command id's,
+  // those don't start until at least '    ', which is integer 538976288. If
+  // we have that many menu items in one window, I think we have other
+  // problems.
+
+  // make id unique
+  ++mCurrentCommandID;
+
+  mCommandToMenuObjectTable.Put(mCurrentCommandID, inMenuItem);
+
+  return mCurrentCommandID;
+}
+
+
+// Removes the mapping between the given 4-character command ID
+// and its associated menu item.
+void nsMenuGroupOwnerX::UnregisterCommand(uint32_t inCommandID)
+{
+  mCommandToMenuObjectTable.Remove(inCommandID);
+}
+
+
+nsMenuItemX* nsMenuGroupOwnerX::GetMenuItemForCommandID(uint32_t inCommandID)
+{
+  nsMenuItemX * result;
+  if (mCommandToMenuObjectTable.Get(inCommandID, &result))
+    return result;
+  else
+    return nullptr;
+}