include/wx/fontmap.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/fontmap.h
   3 // Purpose:     wxFontMapper class
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     04.11.99
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Vadim Zeitlin
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_FONTMAPPER_H_
  13 #define _WX_FONTMAPPER_H_
  14
  15 // ----------------------------------------------------------------------------
  16 // headers
  17 // ----------------------------------------------------------------------------
  18
  19 #if wxUSE_FONTMAP
  20
  21 #include "wx/fontenc.h"         // for wxFontEncoding
  22
  23 #if wxUSE_GUI
  24     #include "wx/fontutil.h"    // for wxNativeEncodingInfo
  25 #endif // wxUSE_GUI
  26
  27 #if wxUSE_CONFIG && wxUSE_FILECONFIG
  28     class WXDLLIMPEXP_BASE wxConfigBase;
  29 #endif // wxUSE_CONFIG
  30
  31 class WXDLLIMPEXP_BASE wxFontMapper;
  32
  33 #if wxUSE_GUI
  34     class WXDLLIMPEXP_CORE wxWindow;
  35 #endif // wxUSE_GUI
  36
  37 // ============================================================================
  38 // wxFontMapper manages user-definable correspondence between wxWindows font
  39 // encodings and the fonts present on the machine.
  40 //
  41 // This is a singleton class, font mapper objects can only be accessed using
  42 // wxFontMapper::Get().
  43 // ============================================================================
  44
  45 // ----------------------------------------------------------------------------
  46 // wxFontMapperBase: this is a non-interactive class which just uses its built
  47 //                   in knowledge of the encodings equivalence
  48 // ----------------------------------------------------------------------------
  49
  50 class WXDLLIMPEXP_BASE wxFontMapperBase
  51 {
  52 public:
  53     // constructtor and such
  54     // ---------------------
  55
  56     // default ctor
  57     wxFontMapperBase();
  58
  59     // virtual dtor for any base class
  60     virtual ~wxFontMapperBase();
  61
  62     // return instance of the wxFontMapper singleton
  63     static wxFontMapper *Get();
  64
  65     // set the singleton to 'mapper' instance and return previous one
  66     static wxFontMapper *Set(wxFontMapper *mapper);
  67
  68     // translates charset strings to encoding
  69     // --------------------------------------
  70
  71     // returns the encoding for the given charset (in the form of RFC 2046) or
  72     // wxFONTENCODING_SYSTEM if couldn't decode it
  73     //
  74     // interactive parameter is ignored in the base class, we behave as if it
  75     // were always false
  76     virtual wxFontEncoding CharsetToEncoding(const wxString& charset,
  77                                              bool interactive = true);
  78
  79     // information about supported encodings
  80     // -------------------------------------
  81
  82     // get the number of font encodings we know about
  83     static size_t GetSupportedEncodingsCount();
  84
  85     // get the n-th supported encoding
  86     static wxFontEncoding GetEncoding(size_t n);
  87
  88     // return internal string identifier for the encoding (see also
  89     // GetEncodingDescription())
  90     static wxString GetEncodingName(wxFontEncoding encoding);
  91
  92     // return user-readable string describing the given encoding
  93     //
  94     // NB: hard-coded now, but might change later (read it from config?)
  95     static wxString GetEncodingDescription(wxFontEncoding encoding);
  96
  97     // find the encoding corresponding to the given name, inverse of
  98     // GetEncodingName() and less general than CharsetToEncoding()
  99     //
 100     // returns wxFONTENCODING_MAX if the name is not a supported encoding
 101     static wxFontEncoding GetEncodingFromName(const wxString& name);
 102
 103
 104     // functions which allow to configure the config object used: by default,
 105     // the global one (from wxConfigBase::Get() will be used) and the default
 106     // root path for the config settings is the string returned by
 107     // GetDefaultConfigPath()
 108     // ----------------------------------------------------------------------
 109
 110 #if wxUSE_CONFIG && wxUSE_FILECONFIG
 111     // set the config object to use (may be NULL to use default)
 112     void SetConfig(wxConfigBase *config) { m_config = config; }
 113
 114     // set the root config path to use (should be an absolute path)
 115     void SetConfigPath(const wxString& prefix);
 116
 117     // return default config path
 118     static const wxChar *GetDefaultConfigPath();
 119 #endif // wxUSE_CONFIG
 120
 121
 122 protected:
 123 #if wxUSE_CONFIG && wxUSE_FILECONFIG
 124     // get the config object we're using -- if it wasn't set explicitly, this
 125     // function will use wxConfig::Get() to get the global one
 126     wxConfigBase *GetConfig();
 127
 128     // gets the root path for our settings -- if it wasn't set explicitly, use
 129     // GetDefaultConfigPath()
 130     const wxString& GetConfigPath();
 131
 132     // change to the given (relative) path in the config, return true if ok
 133     // (then GetConfig() will return something !NULL), false if no config
 134     // object
 135     //
 136     // caller should provide a pointer to the string variable which should be
 137     // later passed to RestorePath()
 138     bool ChangePath(const wxString& pathNew, wxString *pathOld);
 139
 140     // restore the config path after use
 141     void RestorePath(const wxString& pathOld);
 142
 143     // config object and path (in it) to use
 144     wxConfigBase *m_config;
 145     bool m_configIsDummy;
 146
 147     wxString m_configRootPath;
 148 #endif // wxUSE_CONFIG
 149
 150     // the real implementation of the base class version of CharsetToEncoding()
 151     //
 152     // returns wxFONTENCODING_UNKNOWN if encoding is unknown and we shouldn't
 153     // ask the user about it, wxFONTENCODING_SYSTEM if it is unknown but we
 154     // should/could ask the user
 155     int NonInteractiveCharsetToEncoding(const wxString& charset);
 156
 157 private:
 158     // the global fontmapper object or NULL
 159     static wxFontMapper *sm_instance;
 160
 161     friend class wxFontMapperPathChanger;
 162
 163     DECLARE_NO_COPY_CLASS(wxFontMapperBase)
 164 };
 165
 166 // ----------------------------------------------------------------------------
 167 // wxFontMapper: interactive extension of wxFontMapperBase
 168 //
 169 // The default implementations of all functions will ask the user if they are
 170 // not capable of finding the answer themselves and store the answer in a
 171 // config file (configurable via SetConfigXXX functions). This behaviour may
 172 // be disabled by giving the value of false to "interactive" parameter.
 173 // However, the functions will always consult the config file to allow the
 174 // user-defined values override the default logic and there is no way to
 175 // disable this -- which shouldn't be ever needed because if "interactive" was
 176 // never true, the config file is never created anyhow.
 177 // ----------------------------------------------------------------------------
 178
 179 #if wxUSE_GUI
 180
 181 class WXDLLIMPEXP_CORE wxFontMapper : public wxFontMapperBase
 182 {
 183 public:
 184     // default ctor
 185     wxFontMapper();
 186
 187     // virtual dtor for a base class
 188     virtual ~wxFontMapper();
 189
 190     // working with the encodings
 191     // --------------------------
 192
 193     // returns the encoding for the given charset (in the form of RFC 2046) or
 194     // wxFONTENCODING_SYSTEM if couldn't decode it
 195     virtual wxFontEncoding CharsetToEncoding(const wxString& charset,
 196                                              bool interactive = true);
 197
 198     // find an alternative for the given encoding (which is supposed to not be
 199     // available on this system). If successful, return true and fill info
 200     // structure with the parameters required to create the font, otherwise
 201     // return false
 202     virtual bool GetAltForEncoding(wxFontEncoding encoding,
 203                                    wxNativeEncodingInfo *info,
 204                                    const wxString& facename = wxEmptyString,
 205                                    bool interactive = true);
 206
 207     // version better suitable for 'public' use. Returns wxFontEcoding
 208     // that can be used it wxFont ctor
 209     bool GetAltForEncoding(wxFontEncoding encoding,
 210                            wxFontEncoding *alt_encoding,
 211                            const wxString& facename = wxEmptyString,
 212                            bool interactive = true);
 213
 214     // checks whether given encoding is available in given face or not.
 215     //
 216     // if no facename is given (default), return true if it's available in any
 217     // facename at alll.
 218     virtual bool IsEncodingAvailable(wxFontEncoding encoding,
 219                                      const wxString& facename = wxEmptyString);
 220
 221
 222     // configure the appearance of the dialogs we may popup
 223     // ----------------------------------------------------
 224
 225     // the parent window for modal dialogs
 226     void SetDialogParent(wxWindow *parent) { m_windowParent = parent; }
 227
 228     // the title for the dialogs (note that default is quite reasonable)
 229     void SetDialogTitle(const wxString& title) { m_titleDialog = title; }
 230
 231
 232 protected:
 233     // GetAltForEncoding() helper: tests for the existence of the given
 234     // encoding and saves the result in config if ok - this results in the
 235     // following (desired) behaviour: when an unknown/unavailable encoding is
 236     // requested for the first time, the user is asked about a replacement,
 237     // but if he doesn't choose any and the default logic finds one, it will
 238     // be saved in the config so that the user won't be asked about it any
 239     // more
 240     bool TestAltEncoding(const wxString& configEntry,
 241                          wxFontEncoding encReplacement,
 242                          wxNativeEncodingInfo *info);
 243
 244     // the title for our dialogs
 245     wxString m_titleDialog;
 246
 247     // the parent window for our dialogs
 248     wxWindow *m_windowParent;
 249
 250 private:
 251     DECLARE_NO_COPY_CLASS(wxFontMapper)
 252 };
 253
 254 #else // !wxUSE_GUI
 255
 256 class WXDLLIMPEXP_BASE wxFontMapper : public wxFontMapperBase
 257 {
 258 };
 259
 260 #endif // wxUSE_GUI/!wxUSE_GUI
 261
 262 // ----------------------------------------------------------------------------
 263 // global variables
 264 // ----------------------------------------------------------------------------
 265
 266 // the default font mapper for wxWindows programs do NOT use! This is for
 267 // backward compatibility, use wxFontMapper::Get() instead
 268 #define wxTheFontMapper (wxFontMapper::Get())
 269
 270 #else // !wxUSE_FONTMAP
 271
 272 #if wxUSE_GUI
 273     // wxEncodingToCodepage (utils.cpp) needs wxGetNativeFontEncoding
 274     #include "wx/fontutil.h"
 275 #endif
 276
 277 #endif // wxUSE_FONTMAP/!wxUSE_FONTMAP
 278
 279 #endif // _WX_FONTMAPPER_H_
 280