/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * The contents of this file are subject to the Netscape Public License
 * Version 1.0 (the "NPL"); you may not use this file except in
 * compliance with the NPL.  You may obtain a copy of the NPL at
 * http://www.mozilla.org/NPL/
 *
 * Software distributed under the NPL is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
 * for the specific language governing rights and limitations under the
 * NPL.
 *
 * The Initial Developer of this code under the NPL is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
 * Reserved.
 */

#ifndef nsScrollbar_h__
#define nsScrollbar_h__

#include "nsMacControl.h"
#include "nsIScrollbar.h"


/**
 * Mac Scrollbar. 
 */

class nsScrollbar : public nsMacControl, public nsIScrollbar
{
private:
	typedef nsMacControl Inherited;

public:
  nsScrollbar(PRBool aIsVertical);
  virtual ~nsScrollbar();

	// nsISupports
	NS_IMETHOD_(nsrefcnt) AddRef();
	NS_IMETHOD_(nsrefcnt) Release();
	NS_IMETHOD QueryInterface(const nsIID& aIID, void** aInstancePtr);

  NS_IMETHODIMP Create(nsIWidget *aParent,
              const nsRect &aRect,
              EVENT_CALLBACK aHandleEventFunction,
              nsIDeviceContext *aContext = nsnull,
              nsIAppShell *aAppShell = nsnull,
              nsIToolkit *aToolkit = nsnull,
              nsWidgetInitData *aInitData = nsnull);

  // nsWindow Interface
  virtual PRBool	DispatchMouseEvent(nsMouseEvent &aEvent);

  // nsIScrollbar part
  NS_IMETHOD      SetMaxRange(PRUint32 aEndRange);
  NS_IMETHOD  		GetMaxRange(PRUint32& aMaxRange);
  NS_IMETHOD      SetPosition(PRUint32 aPos);
  NS_IMETHOD  		GetPosition(PRUint32& aPos);
  NS_IMETHOD      SetThumbSize(PRUint32 aSize);
  NS_IMETHOD  		GetThumbSize(PRUint32& aSize);
  NS_IMETHOD      SetLineIncrement(PRUint32 aSize);
  NS_IMETHOD  		GetLineIncrement(PRUint32& aSize);
  
  
	/**-------------------------------------------------------------------------------
	 *	Set all the scrollbar parameters
	 *  @update  dc 09/16/98
	 *  @param aMaxRange -- max range of the scrollbar in relative units
	 *  @param aThumbSize -- thumb size, in relative units
	 *  @param aPosition -- the thumb position in relative units
	 *  @param aLineIncrement -- the increment levelof the scrollbar
	 *  @return NS_OK if the position is valid
	 */
  NS_IMETHOD     	SetParameters(PRUint32 aMaxRange, PRUint32 aThumbSize,
                                  PRUint32 aPosition, PRUint32 aLineIncrement);


private:

	PRUint32			mMaxRange;
	PRUint32			mThumbSize;
  PRUint32 			mLineIncrement;
  int      			mIsVertical;
  PRBool				mMouseDownInScroll;
  short					mClickedPartCode;

  void DrawWidget();

};

#endif // nsScrollbar_
