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 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
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 * 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.
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 * The Original Code is mozilla.org code.
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 * The Initial Developer of the Original Code is 
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#ifndef nsScrollbar_h__
#define nsScrollbar_h__

#include "nsWidget.h"
#include "nsIScrollbar.h"

class nsScrollbar : public nsWidget,
                    public nsIScrollbar
{

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

  NS_DECL_ISUPPORTS_INHERITED

  // Override some of the native widget methods for scrollbars
  PRBool     OnResize           (nsSizeEvent &event);
  PRBool     DispatchMouseEvent (nsMouseEvent &aEvent);
  NS_IMETHOD Show               (PRBool bState);
  NS_IMETHOD Move               (PRInt32 aX, PRInt32 aY);
  NS_IMETHOD Resize             (PRInt32 aWidth,
                                 PRInt32 aHeight,
                                 PRBool   aRepaint);
  NS_IMETHOD Resize             (PRInt32 aX,
                                 PRInt32 aY,
                                 PRInt32 aWidth,
                                 PRInt32 aHeight,
                                 PRBool   aRepaint);
  virtual void DestroyNative();  // override since we have 2 native widgets
  
  // nsIScrollBar implementation
  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);
  NS_IMETHOD SetParameters(PRUint32 aMaxRange, PRUint32 aThumbSize,
                           PRUint32 aPosition, PRUint32 aLineIncrement);
  
  PRBool    OnScroll(PRUint32 scrollCode, int cPos);
  void CreateNative(Window aParent, nsRect aRect);
  PRBool    SendEvent(PRUint32 message);
  
private:
  void                 CalcBarBounds(void);
  void                 LayoutBar(void);
  nsresult             NextPage(void);
  nsresult             PrevPage(void);
  PRUint32             mMaxRange;
  PRUint32             mPosition;
  PRUint32             mThumbSize;
  float                mXScale;
  float                mYScale;
  PRUint32             mLineIncrement;
  PRBool               mIsVertical;
  nsIRenderingContext *mRenderingContext;
  Window               mBar;
  nsRect               mBarBounds;
};

#endif // nsButton_h__