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#ifndef nsNativeScrollbar_h__
#define nsNativeScrollbar_h__

#include "nsINativeScrollbar.h"
#include "nsChildView.h"
#include <Controls.h>
#include "nsIContent.h"
#import "mozView.h"

class nsIScrollbarMediator;


//
// nsNativeScrollbar
//
// A wrapper around a MacOS native scrollbar that knows how to work
// with a stub gecko frame to scroll in the GFXScrollFrame mechanism
//

class nsNativeScrollbar : public nsChildView, public nsINativeScrollbar
{
private:
  typedef nsChildView Inherited;

public:
                nsNativeScrollbar();
  virtual       ~nsNativeScrollbar();
  
  NS_DECL_ISUPPORTS_INHERITED
  NS_DECL_NSINATIVESCROLLBAR

    // called from the NativeScrollbarView when someone hits a part
    // of the scrollbar.
  void DoScroll(NSScrollerPart inPart);
  
protected:

  // nsWindow Interface
  virtual PRBool DispatchMouseEvent(nsMouseEvent &aEvent);
  NS_IMETHOD Show(PRBool bState);
  NS_IMETHOD Enable(PRBool bState);
  NS_IMETHOD IsEnabled(PRBool* outState);
  
  NSScroller* GetControl() { return mView; }

  void UpdateContentPosition(PRUint32 inNewPos);
  
  void RecreateHorizontalScrollbar();

  virtual NSView*   CreateCocoaView() ;
  virtual GrafPtr   GetQuickDrawPort() ;

// DATA
private:

  nsIContent*       mContent;          // the content node that affects the scrollbar's value
  nsIScrollbarMediator* mMediator;     // for scrolling with outliners
  
  PRUint32          mValue;
  PRUint32          mMaxValue;
  PRUint32          mVisibleImageSize;
  PRUint32          mLineIncrement;  
};


@interface NativeScrollbarView : NSScroller<mozView>
{
    // Our window [WEAK]
  NSWindow* mWindow;
  
    // the nsNativeScrollbar that created this view. It retains this NSView, so
    // the link back to it must be weak. [WEAK]
  nsNativeScrollbar* mGeckoChild;
}

  // default initializer
- (id)initWithFrame:(NSRect)frameRect geckoChild:(nsNativeScrollbar*)inChild;
  // overridden parent class initializer
- (id)initWithFrame:(NSRect)frameRect;

- (IBAction)scroll:(NSScroller*)sender;

@end


#endif // nsNativeScrollbar_