tdf#91677 fix flickering ruler

Change-Id: Ia14be98fbfd46871b2ac9bd42a07951d86722a8a
(cherry picked from commit f64588a9)

include/svtools/ruler.hxx

@@ -663,9 +663,10 @@ private:
 
     SvtRulerAccessible* pAccContext;
 
-    SVT_DLLPRIVATE void ImplVDrawLine( long nX1, long nY1, long nX2, long nY2 );
-    SVT_DLLPRIVATE void ImplVDrawRect( long nX1, long nY1, long nX2, long nY2 );
-    SVT_DLLPRIVATE void ImplVDrawText( long nX, long nY, const OUString& rText, long nMin = LONG_MIN, long nMax = LONG_MAX );
+    SVT_DLLPRIVATE void ImplVDrawLine(vcl::RenderContext& rRenderContext,  long nX1, long nY1, long nX2, long nY2 );
+    SVT_DLLPRIVATE void ImplVDrawRect(vcl::RenderContext& rRenderContext, long nX1, long nY1, long nX2, long nY2 );
+    SVT_DLLPRIVATE void ImplVDrawText(vcl::RenderContext& rRenderContext, long nX, long nY, const OUString& rText,
+                                      long nMin = LONG_MIN, long nMax = LONG_MAX );
 
     SVT_DLLPRIVATE void ImplDrawTicks(vcl::RenderContext& rRenderContext,
                                       long nMin, long nMax, long nStart, long nVirTop, long nVirBottom);
@@ -702,8 +703,6 @@ private:
     SVT_DLLPRIVATE void     ImplDrag( const Point& rPos );
     SVT_DLLPRIVATE void     ImplEndDrag();
 
-    DECL_DLLPRIVATE_LINK( ImplUpdateHdl, void* );
-
     Ruler (const Ruler &) SAL_DELETED_FUNCTION;
     Ruler& operator= (const Ruler &) SAL_DELETED_FUNCTION;