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/private/datatransfer.h

@@ -0,0 +1,113 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        wx/osx/private/datatransfer.h
+// Purpose:     OS X specific data transfer implementation
+// Author:      Stefan Csomor
+// Created:     2019-03-29
+// Copyright:   (c) 2019 Stefan Csomor <vadim@wxwidgets.org>
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_OSX_PRIVATE_DATATRANSFER_H_
+#define _WX_OSX_PRIVATE_DATATRANSFER_H_
+
+#include "wx/osx/private.h"
+#include "wx/osx/dataform.h"
+
+class WXDLLIMPEXP_FWD_CORE wxDataObject;
+
+class WXDLLIMPEXP_CORE wxOSXDataSourceItem
+{
+public:
+    virtual ~wxOSXDataSourceItem();
+
+    virtual wxDataFormat::NativeFormat AvailableType(CFArrayRef types) const = 0;
+
+    virtual bool GetData( const wxDataFormat& dataFormat, wxMemoryBuffer& target) = 0;
+
+    virtual bool GetData( wxDataFormat::NativeFormat type, wxMemoryBuffer& target) = 0;
+
+    virtual CFDataRef DoGetData(wxDataFormat::NativeFormat type) const = 0;
+};
+
+class WXDLLIMPEXP_CORE wxOSXDataSource
+{
+public:
+    // the number of source items
+    virtual size_t GetItemCount() const = 0;
+
+    // get source item by index, needs to be deleted after use
+    virtual const wxOSXDataSourceItem* GetItem(size_t pos) const = 0;
+
+    // returns true if there is any data in this source conforming to dataFormat
+    virtual bool IsSupported(const wxDataFormat &dataFormat);
+
+    // returns true if there is any data in this source supported by dataobj
+    virtual bool IsSupported(const wxDataObject &dataobj);
+
+    // returns true if there is any data in this source of types
+    virtual bool HasData(CFArrayRef types) const = 0;
+
+};
+
+class WXDLLIMPEXP_CORE wxOSXDataSinkItem
+{
+public:
+    virtual ~wxOSXDataSinkItem();
+
+    virtual void SetFilename(const wxString& filename);
+
+    // translating from wx into native representation
+    virtual void SetData(const wxDataFormat& format, const void *buf, size_t size) = 0;
+
+    // translating from wx into native representation
+    virtual void SetData(wxDataFormat::NativeFormat format, const void *buf, size_t size) = 0;
+
+   // native implementation for setting data
+    virtual void DoSetData(wxDataFormat::NativeFormat format, CFDataRef data) = 0;
+};
+
+
+class WXDLLIMPEXP_CORE wxOSXDataSink
+{
+public:
+    // delete all created sink items
+    virtual void Clear() = 0;
+
+    // create a new sink item
+    virtual wxOSXDataSinkItem* CreateItem() = 0;
+
+    // flush the created sink items into the system sink representation
+    virtual void Flush() = 0 ;
+};
+
+class WXDLLIMPEXP_CORE wxOSXPasteboard : public wxOSXDataSink, public wxOSXDataSource
+{
+public:
+    wxOSXPasteboard(OSXPasteboard native);
+    ~wxOSXPasteboard();
+
+    // sink methods
+
+    virtual wxOSXDataSinkItem* CreateItem() wxOVERRIDE;
+
+    void Clear() wxOVERRIDE;
+
+    void Flush() wxOVERRIDE;
+
+    // source methods
+
+    virtual size_t GetItemCount() const wxOVERRIDE;
+
+    virtual const wxOSXDataSourceItem* GetItem(size_t pos) const wxOVERRIDE;
+
+    virtual bool HasData(CFArrayRef types) const wxOVERRIDE;
+
+    static wxOSXPasteboard* GetGeneralClipboard();
+private:
+    void DeleteSinkItems();
+
+    OSXPasteboard m_pasteboard;
+    wxVector<wxOSXDataSinkItem*> m_sinkItems;
+};
+
+#endif