include/wx/msw/ole/dataobj.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/ole/dataobj.h
   3 // Purpose:     declaration of the wxDataObject class
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     10.05.98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef   _WX_MSW_OLE_DATAOBJ_H
  13 #define   _WX_MSW_OLE_DATAOBJ_H
  14
  15 // ----------------------------------------------------------------------------
  16 // forward declarations
  17 // ----------------------------------------------------------------------------
  18
  19 struct IDataObject;
  20
  21 // ----------------------------------------------------------------------------
  22 // wxDataObject is a "smart" and polymorphic piece of data.
  23 // ----------------------------------------------------------------------------
  24
  25 class WXDLLIMPEXP_CORE wxDataObject : public wxDataObjectBase
  26 {
  27 public:
  28     // ctor & dtor
  29     wxDataObject();
  30     virtual ~wxDataObject();
  31
  32     // retrieve IDataObject interface (for other OLE related classes)
  33     IDataObject *GetInterface() const { return m_pIDataObject; }
  34
  35     // tell the object that it should be now owned by IDataObject - i.e. when
  36     // it is deleted, it should delete us as well
  37     void SetAutoDelete();
  38
  39     // return true if we support this format in "Get" direction
  40     bool IsSupportedFormat(const wxDataFormat& format) const
  41         { return wxDataObjectBase::IsSupported(format, Get); }
  42
  43     // if this method returns false, this wxDataObject will be copied to
  44     // the clipboard with its size prepended to it, which is compatible with
  45     // older wx versions
  46     //
  47     // if returns true, then this wxDataObject will be copied to the clipboard
  48     // without any additional information and ::HeapSize() function will be used
  49     // to get the size of that data
  50     virtual bool NeedsVerbatimData(const wxDataFormat& WXUNUSED(format)) const
  51     {
  52         // return false from here only for compatibility with earlier wx versions
  53         return true;
  54     }
  55
  56     // function to return symbolic name of clipboard format (for debug messages)
  57 #ifdef __WXDEBUG__
  58     static const wxChar *GetFormatName(wxDataFormat format);
  59
  60     #define wxGetFormatName(format) wxDataObject::GetFormatName(format)
  61 #else // !Debug
  62     #define wxGetFormatName(format) _T("")
  63 #endif // Debug/!Debug
  64     // they need to be accessed from wxIDataObject, so made them public,
  65     // or wxIDataObject friend
  66 public:
  67     virtual const void* GetSizeFromBuffer( const void* buffer, size_t* size,
  68                                            const wxDataFormat& format );
  69     virtual void* SetSizeInBuffer( void* buffer, size_t size,
  70                                    const wxDataFormat& format );
  71     virtual size_t GetBufferOffset( const wxDataFormat& format );
  72
  73 private:
  74     IDataObject *m_pIDataObject; // pointer to the COM interface
  75
  76     DECLARE_NO_COPY_CLASS(wxDataObject)
  77 };
  78
  79 #endif  //_WX_MSW_OLE_DATAOBJ_H