layout/generic/nsIScrollPositionListener.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef nsIScrollPositionListener_h___
   8 #define nsIScrollPositionListener_h___
   9
  10 #include "nsCoord.h"
  11
  12 /**
  13  * Provides a way to learn about scroll position changes of
  14  * nsIScrollableFrame's.
  15  */
  16 class nsIScrollPositionListener {
  17  public:
  18   virtual void ScrollPositionWillChange(nscoord aX, nscoord aY) = 0;
  19   virtual void ScrollPositionDidChange(nscoord aX, nscoord aY) = 0;
  20 };
  21
  22 #endif /* nsIScrollPositionListener_h___ */