include/wx/msw/ole/dataobj.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 license
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef   _OLEDATAOBJ_H
  13 #define   _OLEDATAOBJ_H
  14
  15 // ----------------------------------------------------------------------------
  16 // forward declarations
  17 // ----------------------------------------------------------------------------
  18 struct IDataObject;
  19
  20 // ----------------------------------------------------------------------------
  21 // wxDataObject is a "smart" and polymorphic piece of data.
  22 //
  23 // @@@ it's currently "read-only" from COM point of view, i.e. we don't support
  24 //     SetData. We don't support all advise functions neither (but it's easy to
  25 //     do if we really want them)
  26 // ----------------------------------------------------------------------------
  27
  28 class wxDataObject
  29 {
  30 public:
  31   // all data formats (values are the same as in windows.h, do not change!)
  32   enum StdFormat
  33   {
  34     Invalid,
  35     Text,
  36     Bitmap,
  37     MetafilePict,
  38     Sylk,
  39     Dif,
  40     Tiff,
  41     OemText,
  42     Dib,
  43     Palette,
  44     Pendata,
  45     Riff,
  46     Wave,
  47     UnicodeText,
  48     EnhMetafile,
  49     Hdrop,
  50     Locale,
  51     Max
  52   };
  53
  54   // function to return symbolic name of clipboard format (debug messages)
  55   static const char *GetFormatName(wxDataFormat format);
  56
  57   // ctor & dtor
  58   wxDataObject();
  59   ~wxDataObject();
  60
  61   // pure virtuals to override
  62     // get the best suited format for our data
  63   virtual wxDataFormat GetPreferredFormat() const = 0;
  64     // decide if we support this format (should be one of values of
  65     // StdFormat enumerations or a user-defined format)
  66   virtual bool IsSupportedFormat(wxDataFormat format) const = 0;
  67     // get the (total) size of data
  68   virtual uint GetDataSize() const = 0;
  69     // copy raw data to provided pointer
  70   virtual void GetDataHere(void *pBuf) const = 0;
  71
  72   // accessors
  73     // retrieve IDataObject interface (for other OLE related classes)
  74   IDataObject *GetInterface() const { return m_pIDataObject; }
  75
  76 private:
  77   IDataObject *m_pIDataObject; // pointer to the COM interface
  78 };
  79
  80 // ----------------------------------------------------------------------------
  81 // wxTextDataObject is a specialization of wxDataObject for text data
  82 // ----------------------------------------------------------------------------
  83 class wxTextDataObject : public wxDataObject
  84 {
  85 public:
  86   // ctors
  87   wxTextDataObject();
  88   wxTextDataObject(const wxString& strText) : m_strText(strText) { }
  89   void Init(const wxString& strText) { m_strText = strText; }
  90
  91   // implement base class pure virtuals
  92   virtual wxDataFormat GetPreferredFormat() const
  93     { return wxDataObject::Text; }
  94   virtual bool IsSupportedFormat(wxDataFormat format) const
  95     { return format == wxDataObject::Text || format == wxDataObject::Locale; }
  96   virtual uint GetDataSize() const
  97     { return m_strText.Len() + 1; } // +1 for trailing '\0'of course
  98   virtual void GetDataHere(void *pBuf) const
  99     { memcpy(pBuf, m_strText.c_str(), GetDataSize()); }
 100
 101 private:
 102   wxString  m_strText;
 103 };
 104
 105 // ----------------------------------------------------------------------------
 106 // @@@ TODO: wx{Bitmap|Metafile|...}DataObject
 107 // ----------------------------------------------------------------------------
 108
 109 #endif  //_OLEDATAOBJ_H