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 /* -*- Mode: IDL; 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 nsIScrollPositionListener_h___

 #define nsIScrollPositionListener_h___

 #include "nsCoord.h"

 /**

  * Provides a way to learn about scroll position changes of nsIScrollableFrame's.

  */

 class nsIScrollPositionListener {

 public:

 	virtual void ScrollPositionWillChange(nscoord aX, nscoord aY) = 0;

 	virtual void ScrollPositionDidChange(nscoord aX, nscoord aY) = 0;

 };

 #endif /* nsIScrollPositionListener_h___ */