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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 nsIScrollbarMediator_h___

 #define nsIScrollbarMediator_h___

 #include "nsQueryFrame.h"

 class nsScrollbarFrame;

 class nsIScrollbarMediator

 {

 public:

   NS_DECL_QUERYFRAME_TARGET(nsIScrollbarMediator)

   // The aScrollbar argument denotes the scrollbar that's firing the notification.

   NS_IMETHOD PositionChanged(nsScrollbarFrame* aScrollbar, int32_t aOldIndex, int32_t& aNewIndex) = 0;

   NS_IMETHOD ScrollbarButtonPressed(nsScrollbarFrame* aScrollbar, int32_t aOldIndex, int32_t aNewIndex) = 0;

   NS_IMETHOD VisibilityChanged(bool aVisible) = 0;

 };

 #endif