Fraction->double in SwPagePreviewLayout

Change-Id: I98d60742d2c24456621c7c618af530b951af8f1f
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/202554
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

sw/inc/pagepreviewlayout.hxx

@@ -35,7 +35,6 @@
 class SwViewShell;
 class SwRootFrame;
 class SwPageFrame;
-class Fraction;
 
 /** page preview functionality in the writer */
 class SwPagePreviewLayout
@@ -336,8 +335,8 @@ public:
 
         @return Point, start position for new scale
     */
-    Point GetPreviewStartPosForNewScale( const Fraction& _aNewScale,
-                                         const Fraction& _aOldScale,
+    Point GetPreviewStartPosForNewScale( double _fNewScale,
+                                         double _fOldScale,
                                          const Size&     _aNewWinSize ) const;
 
     /** determines, if page with given page number is visible in preview

sw/source/core/view/pagepreviewlayout.cxx

@@ -720,13 +720,13 @@ bool SwPagePreviewLayout::SetBookPreviewMode( const bool _bEnableBookPreview,
 /** calculate start position for new scale
 
 */
-Point SwPagePreviewLayout::GetPreviewStartPosForNewScale(
-                          const Fraction& _aNewScale,
-                          const Fraction& _aOldScale,
+Point SwPagePreviewLayout:: GetPreviewStartPosForNewScale(
+                          double _fNewScale,
+                          double _fOldScale,
                           const Size&     _aNewWinSize ) const
 {
     Point aNewPaintStartPos = maPaintedPreviewDocRect.TopLeft();
-    if ( _aNewScale < _aOldScale )
+    if ( _fNewScale < _fOldScale )
     {
         // increase paint width by moving start point to left.
         if ( mnPreviewLayoutWidth < _aNewWinSize.Width() )

sw/source/uibase/uiview/pview.cxx

@@ -1765,7 +1765,7 @@ void SwPagePreviewWin::AdjustPreviewToNewZoom( const sal_uInt16 _nZoomFactor,
         // calculate new start position for preview paint
         Size aNewWinSize = PixelToLogic( maPxWinSize );
         Point aNewPaintStartPos =
-                mpPgPreviewLayout->GetPreviewStartPosForNewScale( aNewScale, maScale, aNewWinSize );
+                mpPgPreviewLayout->GetPreviewStartPosForNewScale( double(aNewScale), double(maScale), aNewWinSize );
 
         // remember new scaling and prepare preview paint
         // Note: paint of preview will be performed by a corresponding invalidate