+#if TARGET_API_MAC_OSX
+ // note there currently is a bug in OSX which makes inefficient refreshes in case an entire control
+ // area is scrolled, this does not occur if width and height are 2 pixels less,
+ // TODO write optimal workaround
+ HIRect scrollrect = CGRectMake( MacGetLeftBorderSize() , MacGetTopBorderSize() , width , height ) ;
+ if ( rect )
+ {
+ HIRect scrollarea = CGRectMake( rect->x , rect->y , rect->width , rect->height) ;
+ scrollrect = CGRectIntersection( scrollrect , scrollarea ) ;
+ }
+ if ( HIViewGetNeedsDisplay( *m_peer ) )
+ {
+ // becuase HIViewScrollRect does not scroll the already invalidated area we have two options
+ // either immediate redraw or full invalidate
+#if 1
+ // is the better overall solution, as it does not slow down scrolling
+ HIViewSetNeedsDisplay( *m_peer , true ) ;
+#else
+ // this would be the preferred version for fast drawing controls
+ if( UMAGetSystemVersion() < 0x1030 )
+ Update() ;
+ else
+ HIViewRender(*m_peer) ;
+#endif
+ }
+ HIViewScrollRect ( *m_peer , &scrollrect , dx ,dy ) ;
+#else