gecko-dev/layout/xul/base/public/nsIScrollbarMediator.h

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 * The Original Code is Mozilla Communicator client code.
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 * Contributor(s):
 *   Original Author: David W. Hyatt (hyatt@netscape.com)
 *    Nate Nielsen (nielsen@memberwebs.com)
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#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, PRInt32 aOldIndex, PRInt32& aNewIndex) = 0;
  NS_IMETHOD ScrollbarButtonPressed(nsScrollbarFrame* aScrollbar, PRInt32 aOldIndex, PRInt32 aNewIndex) = 0;

  NS_IMETHOD VisibilityChanged(PRBool aVisible) = 0;
};

#endif