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#include "nsISupports.idl"


/**
 * The nsINativeScrollbar is implemented internally by Gecko as a way
 * to communicate between a Gecko frame and a native scrollbar for
 * purposes of shimming a native OS scrollbar into the GFX scrollframe
 * mechanism.
 *
 */

interface nsIPresContext;
interface nsIFrame;
interface nsIContent;
interface nsIScrollbarMediator;


[uuid(dd1cb116-1dd1-11b2-9e67-abac4e09d533)]
interface nsINativeScrollbar : nsISupports
{
  void setContent ( in nsIContent content, in nsIScrollbarMediator mediator);

  readonly attribute long narrowSize;     // the width of a vertical scrollbar, height of horizontal  
  
  attribute unsigned long position;        // current position of the scrollbar
  attribute unsigned long maxRange;        // max value of the scrollbar
  attribute unsigned long lineIncrement;   // number of pixels to scroll per "line" (one click of scroll arrow)
  attribute unsigned long viewSize;        // size of the visible area we're scrolling (in pixels)
};
