interface/wx/xlocale.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        xlocale.h
   3 // Purpose:     interface of wxXLocale
   4 // Author:      wxWidgets team
   5 // RCS-ID:      $Id$
   6 // Licence:     wxWindows license
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9
  10 /**
  11     @class wxXLocale
  12
  13     This class represents a locale object used by so-called xlocale API.
  14
  15     Unlike wxLocale it doesn't provide any non-trivial operations but simply
  16     provides a portable wrapper for POSIX @c locale_t type.
  17
  18     It exists solely to be provided as an argument to various @c wxFoo_l() functions
  19     which are the extensions of the standard locale-dependent functions (hence the
  20     name xlocale). These functions do exactly the same thing as the corresponding
  21     standard @c foo() except that instead of using the global program locale
  22     they use the provided wxXLocale object.
  23
  24     For example, if the user runs the program in French locale, the standard
  25     @c printf() function will output floating point numbers using decimal comma
  26     instead of decimal period. If the program needs to format a floating-point
  27     number in a standard format it can use:
  28     @code wxPrintf_l(wxXLocale::GetCLocale(), "%g", number) @endcode
  29     to do it.
  30
  31     Conversely, if a program wanted to output the number in French locale, even if
  32     the current locale is different, it could use wxXLocale(wxLANGUAGE_FRENCH).
  33
  34
  35     @section xlocale_avail Availability
  36
  37     This class is fully implemented only under the platforms where xlocale POSIX
  38     API or equivalent is available. Currently the xlocale API is available under
  39     most of the recent Unix systems (including Linux, various BSD and Mac OS X) and
  40     Microsoft Visual C++ standard library provides a similar API starting from
  41     version 8 (Visual Studio 2005).
  42
  43     If neither POSIX API nor Microsoft proprietary equivalent are available, this
  44     class is still available but works in degraded mode: the only supported locale
  45     is the C one and attempts to create wxXLocale object for any other locale will
  46     fail. You can use the preprocessor macro @c wxHAS_XLOCALE_SUPPORT to test if
  47     full xlocale API is available or only skeleton C locale support is present.
  48
  49     Notice that wxXLocale is new in wxWidgets 2.9.0 and is not compiled in if
  50     @c wxUSE_XLOCALE was set to 0 during the library compilation.
  51
  52
  53     @section xlocale_func Locale-dependent functions
  54
  55     Currently the following @c _l-functions are available:
  56     - Character classification functions:
  57       @c wxIsxxx_l(), e.g. @c wxIsalpha_l(), @c wxIslower_l() and all the others.
  58     - Character transformation functions:
  59       @c wxTolower_l() and @c wxToupper_l()
  60     We hope to provide many more functions (covering numbers, time and formatted
  61     IO) in the near future.
  62
  63     @library{wxbase}
  64     @category{misc}
  65
  66     @see wxLocale
  67 */
  68 class wxXLocale
  69 {
  70 public:
  71     /**
  72         Creates an uninitialized locale object, IsOk() method will return @false.
  73     */
  74     wxXLocale();
  75
  76     /**
  77         Creates the locale object corresponding to the specified language.
  78     */
  79     wxXLocale(wxLanguage lang);
  80
  81     /**
  82         Creates the locale object corresponding to the specified locale string.
  83         The locale string is system-dependent, use constructor taking wxLanguage
  84         for better portability.
  85     */
  86     wxXLocale(const char* loc);
  87
  88     /**
  89         Returns the global object representing the "C" locale.
  90         For an even shorter access to this object a global @c wxCLocale variable
  91         (implemented as a macro) is provided and can be used instead of calling
  92         this method.
  93     */
  94     static wxXLocale& GetCLocale();
  95
  96     /**
  97         Returns @true if this object is initialized, i.e. represents a valid locale
  98         or @false otherwise.
  99     */
 100     bool IsOk() const;
 101 };