Add DoGetBestSize

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@38188 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/mac/carbon/scrolbar.h

@@ -55,6 +55,9 @@ public:
   void Command(wxCommandEvent& event);
     virtual void  MacHandleControlClick( WXWidget control , wxInt16 controlpart , bool mouseStillDown ) ;
     virtual wxInt32 MacControlHit( WXEVENTHANDLERREF handler , WXEVENTREF mevent ) ;
+
+    wxSize DoGetBestSize() const;
+    
 protected:
     int m_pageSize;
     int m_viewSize;

src/mac/carbon/scrolbar.cpp

@@ -219,3 +219,23 @@ wxInt32 wxScrollBar::MacControlHit( WXEVENTHANDLERREF handler, WXEVENTREF mevent
 
     return noErr;
 }
+
+
+wxSize wxScrollBar::DoGetBestSize() const
+{
+    int w = 100;
+    int h = 100;
+
+    if ( IsVertical() )
+    {
+        w = wxSystemSettings::GetMetric(wxSYS_VSCROLL_X);
+    }
+    else
+    {
+        h = wxSystemSettings::GetMetric(wxSYS_HSCROLL_Y);
+    }
+
+    wxSize best(w, h);
+    CacheBestSize(best);
+    return best;  
+}