Changing datatransfer implementation from CFPasteboard to NSPasteboard API (#1264)

* changing datatransfer from CFPasteboard to NSPasteboard API

* factoring and cleaning up

* Switching back naming

* missed file

* getting wxCFStringRef to be independent of system headers

* add unichar include

* using wxCFStringRef in header

* moving to private headers, change method name

* adapting to lesser content in cfstring.h

* Removing malloc/free usage

* use wxScopedArray throughout

* using wxMemoryBuffer instead of char[]

* fixing nonprecomp headers

* missing forward decl in non-precomp builds

include/wx/osx/dataform.h

@@ -11,10 +11,12 @@
 #ifndef _WX_MAC_DATAFORM_H
 #define _WX_MAC_DATAFORM_H
 
+#include "wx/osx/core/cfstring.h"
+
 class WXDLLIMPEXP_CORE wxDataFormat
 {
 public:
-    typedef unsigned long NativeFormat;
+    typedef CFStringRef NativeFormat;
 
     wxDataFormat();
     wxDataFormat(wxDataFormatId vType);
@@ -41,11 +43,11 @@ public:
     // explicit and implicit conversions to NativeFormat which is one of
     // standard data types (implicit conversion is useful for preserving the
     // compatibility with old code)
-    NativeFormat GetFormatId() const { return m_format; }
-    operator NativeFormat() const { return m_format; }
+    const NativeFormat GetFormatId() const { return m_format; }
+    operator const NativeFormat() const { return m_format; }
 
     void SetId(NativeFormat format);
-
+    
     // string ids are used for custom types - this SetId() must be used for
     // application-specific formats
     wxString GetId() const;
@@ -54,15 +56,18 @@ public:
     // implementation
     wxDataFormatId GetType() const { return m_type; }
     void SetType( wxDataFormatId type );
+    static NativeFormat GetFormatForType(wxDataFormatId type);
 
     // returns true if the format is one of those defined in wxDataFormatId
     bool IsStandard() const { return m_type > 0 && m_type < wxDF_PRIVATE; }
 
+    // adds all the native formats for this format to an array
+    void AddSupportedTypes(CFMutableArrayRef types) const;
 private:
-    wxDataFormatId   m_type;
-    NativeFormat     m_format;
-    // indicates the type in case of wxDF_PRIVATE :
-    wxString         m_id ;
+    void ClearNativeFormat();
+
+    wxDataFormatId  m_type;
+    wxCFStringRef   m_format;
 };
 
 #endif // _WX_MAC_DATAFORM_H