loplugin:useuniqueptr in ScrollBar

Change-Id: I827e997391834d10a617b7c5be8ceafc19e97219
Reviewed-on: https://gerrit.libreoffice.org/53343Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

include/vcl/scrbar.hxx

@@ -23,6 +23,7 @@
 #include <tools/solar.h>
 #include <vcl/dllapi.h>
 #include <vcl/ctrl.hxx>
+#include <memory>
 
 class AutoTimer;
 
@@ -47,7 +48,7 @@ private:
     tools::Rectangle       maPage2Rect;
     tools::Rectangle       maThumbRect;
     tools::Rectangle       maTrackRect;
-    ImplScrollBarData* mpData;
+    std::unique_ptr<ImplScrollBarData> mpData;
     long            mnStartPos;
     long            mnMouseOff;
     long            mnThumbPixRange;

vcl/source/control/scrbar.cxx

@@ -115,7 +115,7 @@ ScrollBar::~ScrollBar()
 
 void ScrollBar::dispose()
 {
-    delete mpData; mpData = nullptr;
+    mpData.reset();
     Control::dispose();
 }
 
@@ -1137,7 +1137,7 @@ void ScrollBar::GetFocus()
 {
     if( !mpData )
     {
-        mpData = new ImplScrollBarData;
+        mpData.reset(new ImplScrollBarData);
         mpData->maTimer.SetInvokeHandler( LINK( this, ScrollBar, ImplAutoTimerHdl ) );
         mpData->maTimer.SetDebugName( "vcl::ScrollBar mpData->maTimer" );
         mpData->mbHide = false;