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
  98     // functions which allow to configure the config object used: by default,
  99     // the global one (from wxConfigBase::Get() will be used) and the default
 100     // root path for the config settings is the string returned by
 101     // GetDefaultConfigPath()
 102     // ----------------------------------------------------------------------
 103
 104 #if wxUSE_CONFIG && wxUSE_FILECONFIG
 105     // set the config object to use (may be NULL to use default)
 106     void SetConfig(wxConfigBase *config) { m_config = config; }
 107
 108     // set the root config path to use (should be an absolute path)
 109     void SetConfigPath(const wxString& prefix);
 110
 111     // return default config path
 112     static const wxChar *GetDefaultConfigPath();
 113 #endif // wxUSE_CONFIG
 114
 115
 116 protected:
 117 #if wxUSE_CONFIG && wxUSE_FILECONFIG
 118     // get the config object we're using -- if it wasn't set explicitly, this
 119     // function will use wxConfig::Get() to get the global one
 120     wxConfigBase *GetConfig();
 121
 122     // gets the root path for our settings -- if it wasn't set explicitly, use
 123     // GetDefaultConfigPath()
 124     const wxString& GetConfigPath();
 125
 126     // change to the given (relative) path in the config, return true if ok
 127     // (then GetConfig() will return something !NULL), false if no config
 128     // object
 129     //
 130     // caller should provide a pointer to the string variable which should be
 131     // later passed to RestorePath()
 132     bool ChangePath(const wxString& pathNew, wxString *pathOld);
 133
 134     // restore the config path after use
 135     void RestorePath(const wxString& pathOld);
 136
 137     // config object and path (in it) to use
 138     wxConfigBase *m_config;
 139     bool m_configIsDummy;
 140
 141     wxString m_configRootPath;
 142 #endif // wxUSE_CONFIG
 143
 144     // the real implementation of the base class version of CharsetToEncoding()
 145     //
 146     // returns wxFONTENCODING_UNKNOWN if encoding is unknown and we shouldn't
 147     // ask the user about it, wxFONTENCODING_SYSTEM if it is unknown but we
 148     // should/could ask the user
 149     int NonInteractiveCharsetToEncoding(const wxString& charset);
 150
 151 private:
 152     // the global fontmapper object or NULL
 153     static wxFontMapper *sm_instance;
 154
 155     friend class wxFontMapperPathChanger;
 156
 157     DECLARE_NO_COPY_CLASS(wxFontMapperBase)
 158 };
 159
 160 // ----------------------------------------------------------------------------
 161 // wxFontMapper: interactive extension of wxFontMapperBase
 162 //
 163 // The default implementations of all functions will ask the user if they are
 164 // not capable of finding the answer themselves and store the answer in a
 165 // config file (configurable via SetConfigXXX functions). This behaviour may
 166 // be disabled by giving the value of false to "interactive" parameter.
 167 // However, the functions will always consult the config file to allow the
 168 // user-defined values override the default logic and there is no way to
 169 // disable this -- which shouldn't be ever needed because if "interactive" was
 170 // never true, the config file is never created anyhow.
 171 // ----------------------------------------------------------------------------
 172
 173 #if wxUSE_GUI
 174
 175 class WXDLLIMPEXP_CORE wxFontMapper : public wxFontMapperBase
 176 {
 177 public:
 178     // default ctor
 179     wxFontMapper();
 180
 181     // virtual dtor for a base class
 182     virtual ~wxFontMapper();
 183
 184     // working with the encodings
 185     // --------------------------
 186
 187     // returns the encoding for the given charset (in the form of RFC 2046) or
 188     // wxFONTENCODING_SYSTEM if couldn't decode it
 189     virtual wxFontEncoding CharsetToEncoding(const wxString& charset,
 190                                              bool interactive = true);
 191
 192     // find an alternative for the given encoding (which is supposed to not be
 193     // available on this system). If successful, return true and fill info
 194     // structure with the parameters required to create the font, otherwise
 195     // return false
 196     virtual bool GetAltForEncoding(wxFontEncoding encoding,
 197                                    wxNativeEncodingInfo *info,
 198                                    const wxString& facename = wxEmptyString,
 199                                    bool interactive = true);
 200
 201     // version better suitable for 'public' use. Returns wxFontEcoding
 202     // that can be used it wxFont ctor
 203     bool GetAltForEncoding(wxFontEncoding encoding,
 204                            wxFontEncoding *alt_encoding,
 205                            const wxString& facename = wxEmptyString,
 206                            bool interactive = true);
 207
 208     // checks whether given encoding is available in given face or not.
 209     // If no facename is given,
 210     virtual bool IsEncodingAvailable(wxFontEncoding encoding,
 211                                      const wxString& facename = wxEmptyString);
 212
 213
 214     // configure the appearance of the dialogs we may popup
 215     // ----------------------------------------------------
 216
 217     // the parent window for modal dialogs
 218     void SetDialogParent(wxWindow *parent) { m_windowParent = parent; }
 219
 220     // the title for the dialogs (note that default is quite reasonable)
 221     void SetDialogTitle(const wxString& title) { m_titleDialog = title; }
 222
 223
 224 protected:
 225     // GetAltForEncoding() helper: tests for the existence of the given
 226     // encoding and saves the result in config if ok - this results in the
 227     // following (desired) behaviour: when an unknown/unavailable encoding is
 228     // requested for the first time, the user is asked about a replacement,
 229     // but if he doesn't choose any and the default logic finds one, it will
 230     // be saved in the config so that the user won't be asked about it any
 231     // more
 232     bool TestAltEncoding(const wxString& configEntry,
 233                          wxFontEncoding encReplacement,
 234                          wxNativeEncodingInfo *info);
 235
 236     // the title for our dialogs
 237     wxString m_titleDialog;
 238
 239     // the parent window for our dialogs
 240     wxWindow *m_windowParent;
 241
 242 private:
 243     DECLARE_NO_COPY_CLASS(wxFontMapper)
 244 };
 245
 246 #else // !wxUSE_GUI
 247
 248 class WXDLLIMPEXP_BASE wxFontMapper : public wxFontMapperBase
 249 {
 250 };
 251
 252 #endif // wxUSE_GUI/!wxUSE_GUI
 253
 254 // ----------------------------------------------------------------------------
 255 // global variables
 256 // ----------------------------------------------------------------------------
 257
 258 // the default font mapper for wxWindows programs do NOT use! This is for
 259 // backward compatibility, use wxFontMapper::Get() instead
 260 #define wxTheFontMapper (wxFontMapper::Get())
 261
 262 #else // !wxUSE_FONTMAP
 263
 264 #if wxUSE_GUI
 265     // wxEncodingToCodepage (utils.cpp) needs wxGetNativeFontEncoding
 266     #include "wx/fontutil.h"
 267 #endif
 268
 269 #endif // wxUSE_FONTMAP/!wxUSE_FONTMAP
 270
 271 #endif // _WX_FONTMAPPER_H_
 272