diff -r 000000000000 -r 6474c204b198 xpfe/appshell/src/nsAppShellWindowEnumerator.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpfe/appshell/src/nsAppShellWindowEnumerator.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,165 @@
+/* -*- 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/. */
+
+#ifndef nsAppShellWindowEnumerator_h
+#define nsAppShellWindowEnumerator_h
+
+#include "nsCOMPtr.h"
+#include "nsString.h"
+
+#include "nsISimpleEnumerator.h"
+#include "nsIXULWindow.h"
+
+class nsWindowMediator;
+
+//
+// nsWindowInfo
+//
+
+struct nsWindowInfo
+{
+  nsWindowInfo(nsIXULWindow* inWindow, int32_t inTimeStamp);
+  ~nsWindowInfo();
+
+  nsCOMPtr<nsIXULWindow>    mWindow;
+  int32_t                   mTimeStamp;
+  uint32_t                  mZLevel;
+
+  // each struct is in two, independent, circular, doubly-linked lists
+  nsWindowInfo              *mYounger, // next younger in sequence
+                            *mOlder;
+  nsWindowInfo              *mLower,   // next lower in z-order
+                            *mHigher;
+  
+  bool TypeEquals(const nsAString &aType);
+  void   InsertAfter(nsWindowInfo *inOlder, nsWindowInfo *inHigher);
+  void   Unlink(bool inAge, bool inZ);
+  void   ReferenceSelf(bool inAge, bool inZ);
+};
+
+//
+// virtual enumerators
+//
+
+class nsAppShellWindowEnumerator : public nsISimpleEnumerator {
+
+friend class nsWindowMediator;
+
+public:
+  nsAppShellWindowEnumerator(const char16_t* aTypeString,
+                             nsWindowMediator& inMediator);
+  virtual ~nsAppShellWindowEnumerator();
+  NS_IMETHOD GetNext(nsISupports **retval) = 0;
+  NS_IMETHOD HasMoreElements(bool *retval);
+
+  NS_DECL_ISUPPORTS
+
+protected:
+
+  void AdjustInitialPosition();
+  virtual nsWindowInfo *FindNext() = 0;
+
+  void WindowRemoved(nsWindowInfo *inInfo);
+
+  nsWindowMediator *mWindowMediator;
+  nsString          mType;
+  nsWindowInfo     *mCurrentPosition;
+};
+
+class nsASDOMWindowEnumerator : public nsAppShellWindowEnumerator {
+
+public:
+  nsASDOMWindowEnumerator(const char16_t* aTypeString,
+                          nsWindowMediator& inMediator);
+  virtual ~nsASDOMWindowEnumerator();
+  NS_IMETHOD GetNext(nsISupports **retval);
+};
+
+class nsASXULWindowEnumerator : public nsAppShellWindowEnumerator {
+
+public:
+  nsASXULWindowEnumerator(const char16_t* aTypeString,
+                          nsWindowMediator& inMediator);
+  virtual ~nsASXULWindowEnumerator();
+  NS_IMETHOD GetNext(nsISupports **retval);
+};
+
+//
+// concrete enumerators
+//
+
+class nsASDOMWindowEarlyToLateEnumerator : public nsASDOMWindowEnumerator {
+
+public:
+  nsASDOMWindowEarlyToLateEnumerator(const char16_t* aTypeString,
+                                     nsWindowMediator& inMediator);
+
+  virtual ~nsASDOMWindowEarlyToLateEnumerator();
+
+protected:
+  virtual nsWindowInfo *FindNext();
+};
+
+class nsASXULWindowEarlyToLateEnumerator : public nsASXULWindowEnumerator {
+
+public:
+  nsASXULWindowEarlyToLateEnumerator(const char16_t* aTypeString,
+                                     nsWindowMediator& inMediator);
+
+  virtual ~nsASXULWindowEarlyToLateEnumerator();
+
+protected:
+  virtual nsWindowInfo *FindNext();
+};
+
+class nsASDOMWindowFrontToBackEnumerator : public nsASDOMWindowEnumerator {
+
+public:
+  nsASDOMWindowFrontToBackEnumerator(const char16_t* aTypeString,
+                                     nsWindowMediator& inMediator);
+
+  virtual ~nsASDOMWindowFrontToBackEnumerator();
+
+protected:
+  virtual nsWindowInfo *FindNext();
+};
+
+class nsASXULWindowFrontToBackEnumerator : public nsASXULWindowEnumerator {
+
+public:
+  nsASXULWindowFrontToBackEnumerator(const char16_t* aTypeString,
+                                     nsWindowMediator& inMediator);
+
+  virtual ~nsASXULWindowFrontToBackEnumerator();
+
+protected:
+  virtual nsWindowInfo *FindNext();
+};
+
+class nsASDOMWindowBackToFrontEnumerator : public nsASDOMWindowEnumerator {
+
+public:
+  nsASDOMWindowBackToFrontEnumerator(const char16_t* aTypeString,
+                                     nsWindowMediator& inMediator);
+
+  virtual ~nsASDOMWindowBackToFrontEnumerator();
+
+protected:
+  virtual nsWindowInfo *FindNext();
+};
+
+class nsASXULWindowBackToFrontEnumerator : public nsASXULWindowEnumerator {
+
+public:
+  nsASXULWindowBackToFrontEnumerator(const char16_t* aTypeString,
+                                     nsWindowMediator& inMediator);
+
+  virtual ~nsASXULWindowBackToFrontEnumerator();
+
+protected:
+  virtual nsWindowInfo *FindNext();
+};
+
+#endif