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

src/osx/core/strconv_cf.cpp

@@ -233,6 +233,41 @@ WXDLLIMPEXP_BASE wxMBConv* new_wxMBConv_cf(wxFontEncoding encoding)
         return usedBufLen;
     }
 
+//
+// wxMacUniCharBuffer
+//
+
+wxMacUniCharBuffer::wxMacUniCharBuffer( const wxString &str )
+{
+    wxMBConvUTF16 converter ;
+#if wxUSE_UNICODE
+    size_t unicharlen = converter.WC2MB( NULL , str.wc_str() , 0 ) ;
+    m_ubuf = (UniChar*) malloc( unicharlen + 2 ) ;
+    converter.WC2MB( (char*) m_ubuf , str.wc_str(), unicharlen + 2 ) ;
+#else
+    const wxWCharBuffer wchar = str.wc_str( wxConvLocal ) ;
+    size_t unicharlen = converter.WC2MB( NULL , wchar.data() , 0 ) ;
+    m_ubuf = (UniChar*) malloc( unicharlen + 2 ) ;
+    converter.WC2MB( (char*) m_ubuf , wchar.data() , unicharlen + 2 ) ;
+#endif
+    m_chars = unicharlen / 2 ;
+}
+
+wxMacUniCharBuffer::~wxMacUniCharBuffer()
+{
+    free( m_ubuf ) ;
+}
+
+UniCharPtr wxMacUniCharBuffer::GetBuffer()
+{
+    return m_ubuf ;
+}
+
+UniCharCount wxMacUniCharBuffer::GetChars()
+{
+    return m_chars ;
+}
+
 #endif // __DARWIN__