include/wx/msw/ole/dataform.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/ole/dataform.h
   3 // Purpose:     declaration of the wxDataFormat class
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     19.10.99 (extracted from msw/ole/dataobj.h)
   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_DATAFORM_H
  13 #define   _WX_MSW_OLE_DATAFORM_H
  14
  15 // ----------------------------------------------------------------------------
  16 // wxDataFormat identifies the single format of data
  17 // ----------------------------------------------------------------------------
  18
  19 class WXDLLEXPORT wxDataFormat
  20 {
  21 public:
  22     // the clipboard formats under Win32 are WORD's
  23     typedef unsigned short NativeFormat;
  24
  25     wxDataFormat(NativeFormat format = wxDF_INVALID) { m_format = format; }
  26
  27     // we need constructors from all string types as implicit conversions to
  28     // wxString don't apply when we already rely on implicit conversion of a,
  29     // for example, "char *" string to wxDataFormat, and existing code does it
  30     wxDataFormat(const wxString& format) { SetId(format); }
  31     wxDataFormat(const char *format) { SetId(format); }
  32     wxDataFormat(const wchar_t *format) { SetId(format); }
  33     wxDataFormat(const wxCStrData& format) { SetId(format); }
  34
  35     wxDataFormat& operator=(NativeFormat format)
  36         { m_format = format; return *this; }
  37     wxDataFormat& operator=(const wxDataFormat& format)
  38         { m_format = format.m_format; return *this; }
  39
  40     // default copy ctor/assignment operators ok
  41
  42     // comparison (must have both versions)
  43     bool operator==(wxDataFormatId format) const
  44         { return m_format == (NativeFormat)format; }
  45     bool operator!=(wxDataFormatId format) const
  46         { return m_format != (NativeFormat)format; }
  47     bool operator==(const wxDataFormat& format) const
  48         { return m_format == format.m_format; }
  49     bool operator!=(const wxDataFormat& format) const
  50         { return m_format != format.m_format; }
  51
  52     // explicit and implicit conversions to NativeFormat which is one of
  53     // standard data types (implicit conversion is useful for preserving the
  54     // compatibility with old code)
  55     NativeFormat GetFormatId() const { return m_format; }
  56     operator NativeFormat() const { return m_format; }
  57
  58     // this works with standard as well as custom ids
  59     void SetType(NativeFormat format) { m_format = format; }
  60     NativeFormat GetType() const { return m_format; }
  61
  62     // string ids are used for custom types - this SetId() must be used for
  63     // application-specific formats
  64     wxString GetId() const;
  65     void SetId(const wxString& format);
  66
  67     // returns true if the format is one of those defined in wxDataFormatId
  68     bool IsStandard() const { return m_format > 0 && m_format < wxDF_PRIVATE; }
  69
  70 private:
  71     NativeFormat m_format;
  72 };
  73
  74 #endif //  _WX_MSW_OLE_DATAFORM_H
  75