loplugin:useuniqueptr in MoreButton

and remove unused mpItemList field in ImplMoreButtonData

Change-Id: I1eee6958d0f064cec22028399de5fb28e8647617
Reviewed-on: https://gerrit.libreoffice.org/53236Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

include/vcl/morebtn.hxx

@@ -24,13 +24,14 @@
 #include <vcl/dllapi.h>
 #include <vcl/mapmod.hxx>
 #include <vcl/button.hxx>
+#include <memory>
 
 struct ImplMoreButtonData;
 
 
 class VCL_DLLPUBLIC MoreButton : public PushButton
 {
-    ImplMoreButtonData* mpMBData;
+    std::unique_ptr<ImplMoreButtonData> mpMBData;
     bool                mbState;
 
                         MoreButton( const MoreButton & ) = delete;

vcl/source/control/morebtn.cxx

@@ -23,18 +23,15 @@
 
 struct ImplMoreButtonData
 {
-    std::vector< VclPtr<vcl::Window> >*  mpItemList;
     OUString                             maMoreText;
     OUString                             maLessText;
 };
 
 void MoreButton::ImplInit( vcl::Window* pParent, WinBits nStyle )
 {
-    mpMBData     = new ImplMoreButtonData;
+    mpMBData.reset(new ImplMoreButtonData);
     mbState      = false;
 
-    mpMBData->mpItemList = nullptr;
-
     PushButton::ImplInit( pParent, nStyle );
 
     mpMBData->maMoreText = Button::GetStandardText( StandardButtonType::More );
@@ -80,8 +77,7 @@ MoreButton::~MoreButton()
 
 void MoreButton::dispose()
 {
-    delete mpMBData->mpItemList;
-    delete mpMBData;
+    mpMBData.reset();
     PushButton::dispose();
 }
 
@@ -98,13 +94,6 @@ void MoreButton::Click()
     // Update the windows according to the status
     if ( mbState )
     {
-        // Show window
-        if ( mpMBData->mpItemList ) {
-            for (VclPtr<Window> & i : *mpMBData->mpItemList) {
-                i->Show();
-            }
-        }
-
         // Adapt dialogbox
         Point aPos( pParent->GetPosPixel() );
         tools::Rectangle aDeskRect( pParent->ImplGetFrameWindow()->GetDesktopRectPixel() );
@@ -127,13 +116,6 @@ void MoreButton::Click()
         // Adapt Dialogbox
         aSize.AdjustHeight( -nDeltaPixel );
         pParent->SetSizePixel( aSize );
-
-        // Hide window(s) again
-        if ( mpMBData->mpItemList ) {
-            for (VclPtr<Window> & i : *mpMBData->mpItemList) {
-                i->Hide();
-            }
-        }
     }
     // Call Click handler here, so that we can initialize the Controls
     PushButton::Click();