291 lines
11 KiB
C
291 lines
11 KiB
C
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/////////////////////////////////////////////////////////////////////////////
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// Name: wx/fontmap.h
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// Purpose: wxFontMapper class
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// Author: Vadim Zeitlin
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// Modified by:
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// Created: 04.11.99
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// RCS-ID: $Id: fontmap.h 49563 2007-10-31 20:46:21Z VZ $
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// Copyright: (c) Vadim Zeitlin
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_FONTMAPPER_H_
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#define _WX_FONTMAPPER_H_
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// ----------------------------------------------------------------------------
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// headers
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// ----------------------------------------------------------------------------
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#if wxUSE_FONTMAP
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#include "wx/fontenc.h" // for wxFontEncoding
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#if wxUSE_GUI
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#include "wx/fontutil.h" // for wxNativeEncodingInfo
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#endif // wxUSE_GUI
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#if wxUSE_CONFIG && wxUSE_FILECONFIG
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class WXDLLIMPEXP_FWD_BASE wxConfigBase;
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#endif // wxUSE_CONFIG
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class WXDLLIMPEXP_FWD_CORE wxFontMapper;
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#if wxUSE_GUI
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class WXDLLIMPEXP_FWD_CORE wxWindow;
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#endif // wxUSE_GUI
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// ============================================================================
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// wxFontMapper manages user-definable correspondence between wxWidgets font
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// encodings and the fonts present on the machine.
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//
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// This is a singleton class, font mapper objects can only be accessed using
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// wxFontMapper::Get().
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// ============================================================================
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// ----------------------------------------------------------------------------
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// wxFontMapperBase: this is a non-interactive class which just uses its built
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// in knowledge of the encodings equivalence
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// ----------------------------------------------------------------------------
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class WXDLLIMPEXP_BASE wxFontMapperBase
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{
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public:
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// constructtor and such
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// ---------------------
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// default ctor
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wxFontMapperBase();
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// virtual dtor for any base class
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virtual ~wxFontMapperBase();
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// return instance of the wxFontMapper singleton
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// wxBase code only cares that it's a wxFontMapperBase
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// In wxBase, wxFontMapper is only forward declared
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// so one cannot implicitly cast from it to wxFontMapperBase.
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static wxFontMapperBase *Get();
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// set the singleton to 'mapper' instance and return previous one
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static wxFontMapper *Set(wxFontMapper *mapper);
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// delete the existing font mapper if any
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static void Reset();
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// translates charset strings to encoding
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// --------------------------------------
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// returns the encoding for the given charset (in the form of RFC 2046) or
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// wxFONTENCODING_SYSTEM if couldn't decode it
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//
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// interactive parameter is ignored in the base class, we behave as if it
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// were always false
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virtual wxFontEncoding CharsetToEncoding(const wxString& charset,
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bool interactive = true);
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// information about supported encodings
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// -------------------------------------
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// get the number of font encodings we know about
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static size_t GetSupportedEncodingsCount();
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// get the n-th supported encoding
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static wxFontEncoding GetEncoding(size_t n);
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// return canonical name of this encoding (this is a short string,
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// GetEncodingDescription() returns a longer one)
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static wxString GetEncodingName(wxFontEncoding encoding);
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// return a list of all names of this encoding (see GetEncodingName)
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static const wxChar** GetAllEncodingNames(wxFontEncoding encoding);
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// return user-readable string describing the given encoding
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//
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// NB: hard-coded now, but might change later (read it from config?)
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static wxString GetEncodingDescription(wxFontEncoding encoding);
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// find the encoding corresponding to the given name, inverse of
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// GetEncodingName() and less general than CharsetToEncoding()
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//
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// returns wxFONTENCODING_MAX if the name is not a supported encoding
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static wxFontEncoding GetEncodingFromName(const wxString& name);
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// functions which allow to configure the config object used: by default,
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// the global one (from wxConfigBase::Get() will be used) and the default
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// root path for the config settings is the string returned by
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// GetDefaultConfigPath()
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// ----------------------------------------------------------------------
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#if wxUSE_CONFIG && wxUSE_FILECONFIG
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// set the root config path to use (should be an absolute path)
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void SetConfigPath(const wxString& prefix);
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// return default config path
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static const wxChar *GetDefaultConfigPath();
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#endif // wxUSE_CONFIG
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// returns true for the base class and false for a "real" font mapper object
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// (implementation-only)
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virtual bool IsDummy() { return true; }
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protected:
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#if wxUSE_CONFIG && wxUSE_FILECONFIG
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// get the config object we're using -- either the global config object
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// or a wxMemoryConfig object created by this class otherwise
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wxConfigBase *GetConfig();
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// gets the root path for our settings -- if it wasn't set explicitly, use
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// GetDefaultConfigPath()
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const wxString& GetConfigPath();
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// change to the given (relative) path in the config, return true if ok
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// (then GetConfig() will return something !NULL), false if no config
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// object
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//
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// caller should provide a pointer to the string variable which should be
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// later passed to RestorePath()
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bool ChangePath(const wxString& pathNew, wxString *pathOld);
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// restore the config path after use
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void RestorePath(const wxString& pathOld);
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// config object and path (in it) to use
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wxConfigBase *m_configDummy;
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wxString m_configRootPath;
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#endif // wxUSE_CONFIG
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// the real implementation of the base class version of CharsetToEncoding()
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//
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// returns wxFONTENCODING_UNKNOWN if encoding is unknown and we shouldn't
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// ask the user about it, wxFONTENCODING_SYSTEM if it is unknown but we
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// should/could ask the user
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int NonInteractiveCharsetToEncoding(const wxString& charset);
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private:
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// the global fontmapper object or NULL
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static wxFontMapper *sm_instance;
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friend class wxFontMapperPathChanger;
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DECLARE_NO_COPY_CLASS(wxFontMapperBase)
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};
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// ----------------------------------------------------------------------------
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// wxFontMapper: interactive extension of wxFontMapperBase
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//
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// The default implementations of all functions will ask the user if they are
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// not capable of finding the answer themselves and store the answer in a
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// config file (configurable via SetConfigXXX functions). This behaviour may
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// be disabled by giving the value of false to "interactive" parameter.
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// However, the functions will always consult the config file to allow the
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// user-defined values override the default logic and there is no way to
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// disable this -- which shouldn't be ever needed because if "interactive" was
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// never true, the config file is never created anyhow.
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// ----------------------------------------------------------------------------
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#if wxUSE_GUI
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class WXDLLIMPEXP_CORE wxFontMapper : public wxFontMapperBase
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{
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public:
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// default ctor
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wxFontMapper();
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// virtual dtor for a base class
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virtual ~wxFontMapper();
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// working with the encodings
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// --------------------------
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// returns the encoding for the given charset (in the form of RFC 2046) or
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// wxFONTENCODING_SYSTEM if couldn't decode it
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virtual wxFontEncoding CharsetToEncoding(const wxString& charset,
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bool interactive = true);
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// find an alternative for the given encoding (which is supposed to not be
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// available on this system). If successful, return true and fill info
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// structure with the parameters required to create the font, otherwise
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// return false
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virtual bool GetAltForEncoding(wxFontEncoding encoding,
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wxNativeEncodingInfo *info,
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const wxString& facename = wxEmptyString,
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bool interactive = true);
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// version better suitable for 'public' use. Returns wxFontEcoding
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// that can be used it wxFont ctor
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bool GetAltForEncoding(wxFontEncoding encoding,
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wxFontEncoding *alt_encoding,
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const wxString& facename = wxEmptyString,
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bool interactive = true);
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// checks whether given encoding is available in given face or not.
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//
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// if no facename is given (default), return true if it's available in any
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// facename at alll.
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virtual bool IsEncodingAvailable(wxFontEncoding encoding,
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const wxString& facename = wxEmptyString);
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// configure the appearance of the dialogs we may popup
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// ----------------------------------------------------
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// the parent window for modal dialogs
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void SetDialogParent(wxWindow *parent) { m_windowParent = parent; }
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// the title for the dialogs (note that default is quite reasonable)
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void SetDialogTitle(const wxString& title) { m_titleDialog = title; }
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// GUI code needs to know it's a wxFontMapper because there
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// are additional methods in the subclass.
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static wxFontMapper *Get();
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// pseudo-RTTI since we aren't a wxObject.
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virtual bool IsDummy() { return false; }
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protected:
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// GetAltForEncoding() helper: tests for the existence of the given
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// encoding and saves the result in config if ok - this results in the
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// following (desired) behaviour: when an unknown/unavailable encoding is
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// requested for the first time, the user is asked about a replacement,
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// but if he doesn't choose any and the default logic finds one, it will
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// be saved in the config so that the user won't be asked about it any
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// more
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bool TestAltEncoding(const wxString& configEntry,
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wxFontEncoding encReplacement,
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wxNativeEncodingInfo *info);
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// the title for our dialogs
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wxString m_titleDialog;
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// the parent window for our dialogs
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wxWindow *m_windowParent;
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private:
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DECLARE_NO_COPY_CLASS(wxFontMapper)
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};
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#endif // wxUSE_GUI
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// ----------------------------------------------------------------------------
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// global variables
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// ----------------------------------------------------------------------------
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// the default font mapper for wxWidgets programs do NOT use! This is for
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// backward compatibility, use wxFontMapper::Get() instead
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#define wxTheFontMapper (wxFontMapper::Get())
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#else // !wxUSE_FONTMAP
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#if wxUSE_GUI
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// wxEncodingToCodepage (utils.cpp) needs wxGetNativeFontEncoding
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#include "wx/fontutil.h"
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#endif
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#endif // wxUSE_FONTMAP/!wxUSE_FONTMAP
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#endif // _WX_FONTMAPPER_H_
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