convert sc/source/ui/inc/zoomctrl.hxx from String to OUString

Change-Id: I60278f22fd2c4e39c860a4257e1847b3c8ac4f40

sw/source/ui/inc/zoomctrl.hxx

@@ -24,7 +24,7 @@
 class SwZoomControl : public SvxZoomStatusBarControl
 {
 private:
-    String  sPreviewZoom;
+    OUString  sPreviewZoom;
 public:
     virtual void    Command( const CommandEvent& rCEvt );
     virtual void    StateChanged( sal_uInt16 nSID, SfxItemState eState,

sw/source/ui/utlui/zoomctrl.cxx

@@ -58,7 +58,7 @@ void SwZoomControl::StateChanged( sal_uInt16 nSID, SfxItemState eState,
 
 void SwZoomControl::Paint( const UserDrawEvent& rUsrEvt )
 {
-    if(!sPreviewZoom.Len())
+    if(sPreviewZoom.isEmpty())
         SvxZoomStatusBarControl::Paint(rUsrEvt);
     else
         GetStatusBar().SetItemText( GetId(), sPreviewZoom );
@@ -66,7 +66,7 @@ void SwZoomControl::Paint( const UserDrawEvent& rUsrEvt )
 
 void SwZoomControl::Command( const CommandEvent& rCEvt )
 {
-    if(!sPreviewZoom.Len())
+    if(sPreviewZoom.isEmpty())
         SvxZoomStatusBarControl::Command(rCEvt);
 }