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 /* -*- 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 nsIScrollObserver_h___

 #define nsIScrollObserver_h___

 #include "nsISupports.h"

 #define NS_ISCROLLOBSERVER_IID \

   { 0x7c1a8b63, 0xe322, 0x4827, \

     { 0xa4, 0xb1, 0x3b, 0x6e, 0x59, 0x03, 0x47, 0x7e } }

 class nsIScrollObserver : public nsISupports

 {

 public:

   NS_DECLARE_STATIC_IID_ACCESSOR(NS_ISCROLLOBSERVER_IID)

   /**

    * Called when the scroll position of some element has changed.

    */

   virtual void ScrollPositionChanged() = 0;

 };

 NS_DEFINE_STATIC_IID_ACCESSOR(nsIScrollObserver, NS_ISCROLLOBSERVER_IID)

 #endif /* nsIScrollObserver_h___ */