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 license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_FONTMAPPER_H_
  13 #define _WX_FONTMAPPER_H_
  14
  15 #ifdef __GNUG__
  16     #pragma interface "fontmap.h"
  17 #endif
  18
  19 // ----------------------------------------------------------------------------
  20 // headers
  21 // ----------------------------------------------------------------------------
  22
  23 #if wxUSE_FONTMAP
  24
  25 #include "wx/fontenc.h"         // for wxFontEncoding
  26
  27 #if wxUSE_GUI
  28     #include "wx/fontutil.h"    // for wxNativeEncodingInfo
  29 #endif // wxUSE_GUI
  30
  31 #if wxUSE_CONFIG
  32     class WXDLLEXPORT wxConfigBase;
  33 #endif // wxUSE_CONFIG
  34
  35 #if wxUSE_GUI
  36     class WXDLLEXPORT wxWindow;
  37 #endif // wxUSE_GUI
  38
  39 // ----------------------------------------------------------------------------
  40 // wxFontMapper manages user-definable correspondence between logical font
  41 // names and the fonts present on the machine.
  42 //
  43 // The default implementations of all functions will ask the user if they are
  44 // not capable of finding the answer themselves and store the answer in a
  45 // config file (configurable via SetConfigXXX functions). This behaviour may
  46 // be disabled by giving the value of FALSE to "interactive" parameter.
  47 // However, the functions will always consult the config file to allow the
  48 // user-defined values override the default logic and there is no way to
  49 // disable this - which shouldn't be ever needed because if "interactive" was
  50 // never TRUE, the config file is never created anyhow.
  51 // ----------------------------------------------------------------------------
  52
  53 class WXDLLEXPORT wxFontMapper
  54 {
  55 public:
  56     // default ctor
  57     wxFontMapper();
  58
  59     // virtual dtor for a base class
  60     virtual ~wxFontMapper();
  61
  62     // return instance of the wxFontMapper singleton
  63     static wxFontMapper *Get();
  64     // set the sigleton to 'mapper' instance and return previous one
  65     static wxFontMapper *Set(wxFontMapper *mapper);
  66
  67 #if wxUSE_GUI
  68     // find an alternative for the given encoding (which is supposed to not be
  69     // available on this system). If successful, return TRUE and fill info
  70     // structure with the parameters required to create the font, otherwise
  71     // return FALSE
  72     virtual bool GetAltForEncoding(wxFontEncoding encoding,
  73                                    wxNativeEncodingInfo *info,
  74                                    const wxString& facename = wxEmptyString,
  75                                    bool interactive = TRUE);
  76
  77     // version better suitable for 'public' use. Returns wxFontEcoding
  78     // that can be used it wxFont ctor
  79     bool GetAltForEncoding(wxFontEncoding encoding,
  80                            wxFontEncoding *alt_encoding,
  81                            const wxString& facename = wxEmptyString,
  82                            bool interactive = TRUE);
  83
  84     // checks whether given encoding is available in given face or not.
  85     // If no facename is given,
  86     virtual bool IsEncodingAvailable(wxFontEncoding encoding,
  87                                      const wxString& facename = wxEmptyString);
  88 #endif // wxUSE_GUI
  89
  90     // returns the encoding for the given charset (in the form of RFC 2046) or
  91     // wxFONTENCODING_SYSTEM if couldn't decode it
  92     virtual wxFontEncoding CharsetToEncoding(const wxString& charset,
  93                                              bool interactive = TRUE);
  94
  95     // encoding names
  96     // --------------
  97
  98     // return internal string identifier for the encoding (see also
  99     // GetEncodingDescription())
 100     static wxString GetEncodingName(wxFontEncoding encoding);
 101
 102     // return user-readable string describing the given encoding
 103     //
 104     // NB: hard-coded now, but might change later (read it from config?)
 105     static wxString GetEncodingDescription(wxFontEncoding encoding);
 106
 107     // configure the appearance of the dialogs we may popup
 108     // ----------------------------------------------------
 109
 110 #if wxUSE_GUI
 111     // the parent window for modal dialogs
 112     void SetDialogParent(wxWindow *parent) { m_windowParent = parent; }
 113
 114     // the title for the dialogs (note that default is quite reasonable)
 115     void SetDialogTitle(const wxString& title) { m_titleDialog = title; }
 116 #endif // wxUSE_GUI
 117
 118     // functions which allow to configure the config object used: by default,
 119     // the global one (from wxConfigBase::Get() will be used) and the default
 120     // root path for the config settings is the string returned by
 121     // GetDefaultConfigPath()
 122     // ----------------------------------------------------------------------
 123
 124 #if wxUSE_CONFIG
 125     // set the config object to use (may be NULL to use default)
 126     void SetConfig(wxConfigBase *config) { m_config = config; }
 127
 128     // set the root config path to use (should be an absolute path)
 129     void SetConfigPath(const wxString& prefix);
 130
 131     // return default config path
 132     static const wxChar *GetDefaultConfigPath();
 133 #endif
 134
 135 protected:
 136
 137 #if wxUSE_CONFIG
 138     // get the config object we're using - if it wasn't set explicitly, this
 139     // function will use wxConfig::Get() to get the global one
 140     wxConfigBase *GetConfig();
 141
 142     // gets the root path for our settings - if itwasn't set explicitly, use
 143     // GetDefaultConfigPath()
 144     const wxString& GetConfigPath();
 145 #endif
 146
 147     // change to the given (relative) path in the config, return TRUE if ok
 148     // (then GetConfig() will return something !NULL), FALSE if no config
 149     // object
 150     //
 151     // caller should provide a pointer to the string variable which should be
 152     // later passed to RestorePath()
 153     bool ChangePath(const wxString& pathNew, wxString *pathOld);
 154
 155     // restore the config path after use
 156     void RestorePath(const wxString& pathOld);
 157
 158 #if wxUSE_GUI
 159     // GetAltForEncoding() helper: tests for the existence of the given
 160     // encoding and saves the result in config if ok - this results in the
 161     // following (desired) behaviour: when an unknown/unavailable encoding is
 162     // requested for the first time, the user is asked about a replacement,
 163     // but if he doesn't choose any and the default logic finds one, it will
 164     // be saved in the config so that the user won't be asked about it any
 165     // more
 166     bool TestAltEncoding(const wxString& configEntry,
 167                          wxFontEncoding encReplacement,
 168                          wxNativeEncodingInfo *info);
 169 #endif // wxUSE_GUI
 170
 171 #if wxUSE_CONFIG
 172     // config object and path (in it) to use
 173     wxConfigBase *m_config;
 174     bool m_configIsDummy;
 175 #endif
 176
 177     wxString  m_configRootPath;
 178
 179 #if wxUSE_GUI
 180     // the title for our dialogs
 181     wxString m_titleDialog;
 182
 183     // the parent window for our dialogs
 184     wxWindow *m_windowParent;
 185 #endif // wxUSE_GUI
 186
 187     friend class wxFontMapperPathChanger;
 188
 189 private:
 190     static wxFontMapper *sm_instance;
 191 };
 192
 193 // ----------------------------------------------------------------------------
 194 // global variables
 195 // ----------------------------------------------------------------------------
 196
 197 // the default font mapper for wxWindows programs
 198 // do NOT use! This is for backward compatibility, use wxFontMapper::Get() instead
 199 #define wxTheFontMapper (wxFontMapper::Get())
 200
 201 #endif // wxUSE_FONTMAP
 202
 203 #endif // _WX_FONTMAPPER_H_