adding measuring contexts, streamlining printing code

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@43012 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/mac/carbon/graphics.cpp

@@ -1869,6 +1869,8 @@ public :
     virtual wxGraphicsContext * CreateContextFromNativeWindow( void * window );
 
     virtual wxGraphicsContext * CreateContext( wxWindow* window );
+    
+    virtual wxGraphicsContext * CreateMeasuringContext();
 
     // Path
 
@@ -1934,6 +1936,11 @@ wxGraphicsContext * wxMacCoreGraphicsRenderer::CreateContext( wxWindow* window )
     return new wxMacCoreGraphicsContext(this, window );
 }
 
+wxGraphicsContext * wxMacCoreGraphicsRenderer::CreateMeasuringContext()
+{
+    return new wxMacCoreGraphicsContext(this);
+}
+
 // Path
 
 wxGraphicsPath wxMacCoreGraphicsRenderer::CreatePath()