/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator client code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Original Author: David W. Hyatt (hyatt@netscape.com)
 *    Nate Nielsen (nielsen@memberwebs.com)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * ***** END LICENSE BLOCK ***** */

#ifndef nsIScrollbarMediator_h___
#define nsIScrollbarMediator_h___

#include "nsQueryFrame.h"

class nsIScrollbarFrame;

class nsIScrollbarMediator
{
public:
  NS_DECL_QUERYFRAME_TARGET(nsIScrollbarMediator)

  // The nsIFrame aScrollbar argument below denotes the
  // scrollbar that's firing the notification. It should be
  // where the same object as where nsIScrollbarFrame is implemented

  NS_IMETHOD PositionChanged(nsIScrollbarFrame* aScrollbar, PRInt32 aOldIndex, PRInt32& aNewIndex) = 0;
  NS_IMETHOD ScrollbarButtonPressed(nsIScrollbarFrame* aScrollbar, PRInt32 aOldIndex, PRInt32 aNewIndex) = 0;

  NS_IMETHOD VisibilityChanged(PRBool aVisible) = 0;
};

#endif

