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 licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef   _WX_OLEDATAOBJ_H
  13 #define   _WX_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 // TODO 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 WXDLLEXPORT wxDataObject
  29 {
  30 public:
  31   // function to return symbolic name of clipboard format (debug messages)
  32   static const char *GetFormatName(wxDataFormat format);
  33
  34   // ctor & dtor
  35   wxDataObject();
  36   ~wxDataObject();
  37
  38   // pure virtuals to override
  39     // get the best suited format for our data
  40   virtual wxDataFormat GetPreferredFormat() const = 0;
  41     // decide if we support this format (should be one of values of
  42     // wxDataFormatId enumerations or a user-defined format)
  43   virtual bool IsSupportedFormat(wxDataFormat format) const = 0;
  44     // get the (total) size of data
  45   virtual size_t GetDataSize() const = 0;
  46     // copy raw data to provided pointer
  47   virtual void GetDataHere(void *pBuf) const = 0;
  48
  49   // accessors
  50     // retrieve IDataObject interface (for other OLE related classes)
  51   IDataObject *GetInterface() const { return m_pIDataObject; }
  52
  53   ////// wxGTK compatibility: hopefully to become the preferred API.
  54   virtual wxDataFormat GetFormat() const { return GetPreferredFormat(); }
  55
  56 private:
  57   IDataObject *m_pIDataObject; // pointer to the COM interface
  58 };
  59
  60 // ----------------------------------------------------------------------------
  61 // wxTextDataObject is a specialization of wxDataObject for text data
  62 // ----------------------------------------------------------------------------
  63 class WXDLLEXPORT wxTextDataObject : public wxDataObject
  64 {
  65 public:
  66   // ctors
  67   wxTextDataObject() { }
  68   wxTextDataObject(const wxString& strText) : m_strText(strText) { }
  69   void Init(const wxString& strText) { m_strText = strText; }
  70
  71   // implement base class pure virtuals
  72   virtual wxDataFormat GetPreferredFormat() const
  73     { return wxDF_TEXT; }
  74   virtual bool IsSupportedFormat(wxDataFormat format) const
  75     { return format == wxDF_TEXT || format == wxDF_LOCALE; }
  76   virtual size_t GetDataSize() const
  77     { return m_strText.Len() + 1; } // +1 for trailing '\0'of course
  78   virtual void GetDataHere(void *pBuf) const
  79     { memcpy(pBuf, m_strText.c_str(), GetDataSize()); }
  80
  81   ////// wxGTK compatibility: hopefully to become the preferred API.
  82   void SetText(const wxString& strText) { m_strText = strText; }
  83   wxString GetText() const { return m_strText; }
  84   virtual wxDataFormat GetFormat() const { return wxDF_TEXT; }
  85
  86 private:
  87   wxString  m_strText;
  88 };
  89
  90 // ----------------------------------------------------------------------------
  91 // @@@ TODO: wx{Bitmap|Metafile|...}DataObject
  92 // ----------------------------------------------------------------------------
  93
  94 // ----------------------------------------------------------------------------
  95 // wxBitmapDataObject is a specialization of wxDataObject for bitmap data
  96 // ----------------------------------------------------------------------------
  97
  98 // TODO: implement OLE side of things. At present, it's just for clipboard
  99 // use.
 100 class WXDLLEXPORT wxBitmapDataObject : public wxDataObject
 101 {
 102 public:
 103   // ctors
 104   wxBitmapDataObject() {};
 105   wxBitmapDataObject(const wxBitmap& bitmap): m_bitmap(bitmap) {}
 106   void SetBitmap(const wxBitmap& bitmap) { m_bitmap = bitmap; }
 107   wxBitmap GetBitmap() const { return m_bitmap; }
 108
 109   virtual wxDataFormat GetFormat() const { return wxDF_BITMAP; }
 110
 111   // implement base class pure virtuals
 112   virtual wxDataFormat GetPreferredFormat() const
 113     { return wxDF_BITMAP; }
 114   virtual bool IsSupportedFormat(wxDataFormat format) const
 115     { return format == wxDF_BITMAP; }
 116   virtual size_t GetDataSize() const
 117     { wxASSERT(false); return 0; } // BEMIMP
 118   virtual void GetDataHere(void *pBuf) const
 119     { wxASSERT(false); } // BEMIMP
 120
 121 private:
 122   wxBitmap  m_bitmap;
 123 };
 124
 125 // ----------------------------------------------------------------------------
 126 // wxMetaFileDataObject: see metafile.h is a specialization of wxDataObject for bitmap data
 127 // ----------------------------------------------------------------------------
 128
 129 // TODO: wxFileDataObject.
 130
 131 #endif  //_WX_OLEDATAOBJ_H
 132