577 lines
20 KiB
C
577 lines
20 KiB
C
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/////////////////////////////////////////////////////////////////////////////
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// Name: translation.h
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// Purpose: wxTranslation class
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// Author: wxWidgets team
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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/**
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This class allows getting translations for strings.
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In wxWidgets this class manages message catalogs which contain the
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translations of the strings used to the current language. Unlike wxLocale,
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it isn't bound to locale. It can be used either independently of, or in
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conjunction with wxLocale. In the latter case, you should initialize
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wxLocale (which creates wxTranslations instance) first; in the former, you
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need to create a wxTranslations object and Set() it manually.
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Only one wxTranslations instance is active at a time; it is set with the
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Set() method and obtained using Get().
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Unlike wxLocale, wxTranslations' primary mean of identifying language
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is by its "canonical name", i.e. ISO 639 code, possibly combined with
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ISO 3166 country code and additional modifiers (examples include
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"fr", "en_GB" or "ca@valencia"; see wxLocale::GetCanonicalName() for
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more information). This allows apps using wxTranslations API to use even
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languages not recognized by the operating system or not listed in
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wxLanguage enum.
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@since 2.9.1
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@see wxLocale, wxTranslationsLoader, wxFileTranslationsLoader
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*/
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class wxTranslations
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{
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public:
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/// Constructor
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wxTranslations();
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/**
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Returns current translations object, may return NULL.
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You must either call this early in app initialization code, or let
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wxLocale do it for you.
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*/
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static wxTranslations *Get();
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/**
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Sets current translations object.
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Deletes previous translation object and takes ownership of @a t.
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*/
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static void Set(wxTranslations *t);
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/**
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Changes loader use to read catalogs to a non-default one.
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Deletes previous loader and takes ownership of @a loader.
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@see wxTranslationsLoader, wxFileTranslationsLoader, wxResourceTranslationsLoader
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*/
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void SetLoader(wxTranslationsLoader *loader);
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/**
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Sets translations language to use.
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wxLANGUAGE_DEFAULT has special meaning: best suitable translation,
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given user's preference and available translations, will be used.
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*/
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void SetLanguage(wxLanguage lang);
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/**
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Sets translations language to use.
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Empty @a lang string has the same meaning as wxLANGUAGE_DEFAULT in
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SetLanguage(wxLanguage): best suitable translation, given user's
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preference and available translations, will be used.
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*/
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void SetLanguage(const wxString& lang);
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/**
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Returns list of all translations of @a domain that were found.
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This method can be used e.g. to populate list of application's
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translations offered to the user. To do this, pass the app's main
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catalog as @a domain.
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@see GetBestTranslation()
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*/
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wxArrayString GetAvailableTranslations(const wxString& domain) const;
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/**
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Returns the best UI language for the @a domain.
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The language is determined from the preferred UI language or languages
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list the user configured in the OS. Notice that this may or may not
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correspond to the default @em locale as obtained from
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wxLocale::GetSystemLanguage(); modern operation systems (Windows
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Vista+, OS X) have separate language and regional (= locale) settings.
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@param domain
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The catalog domain to look for.
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@param msgIdLanguage
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Specifies the language of "msgid" strings in source code
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(i.e. arguments to GetString(), wxGetTranslation() and the _() macro).
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@return Language code if a suitable match was found, empty string
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otherwise.
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@since 2.9.5
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*/
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wxString GetBestTranslation(const wxString& domain, wxLanguage msgIdLanguage);
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/**
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Returns the best UI language for the @a domain.
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The language is determined from the preferred UI language or languages
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list the user configured in the OS. Notice that this may or may not
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correspond to the default @em locale as obtained from
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wxLocale::GetSystemLanguage(); modern operation systems (Windows
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Vista+, OS X) have separate language and regional (= locale) settings.
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@param domain
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The catalog domain to look for.
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@param msgIdLanguage
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Specifies the language of "msgid" strings in source code
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(i.e. arguments to GetString(), wxGetTranslation() and the _() macro).
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@return Language code if a suitable match was found, empty string
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otherwise.
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@since 2.9.5
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*/
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wxString GetBestTranslation(const wxString& domain,
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const wxString& msgIdLanguage = "en");
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/**
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Add standard wxWidgets catalogs ("wxstd" and possible port-specific
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catalogs).
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@return @true if a suitable catalog was found, @false otherwise
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@see AddCatalog()
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*/
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bool AddStdCatalog();
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/**
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Add a catalog for use with the current locale.
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By default, it is searched for in standard places (see
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wxFileTranslationsLoader), but you may also prepend additional
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directories to the search path with
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wxFileTranslationsLoader::AddCatalogLookupPathPrefix().
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All loaded catalogs will be used for message lookup by GetString() for
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the current locale.
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In this overload, @c msgid strings are assumed
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to be in English and written only using 7-bit ASCII characters.
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If you have to deal with non-English strings or 8-bit characters in the
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source code, see the instructions in @ref overview_nonenglish.
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@return
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@true if catalog was successfully loaded, @false otherwise (which might
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mean that the catalog is not found or that it isn't in the correct format).
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*/
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bool AddCatalog(const wxString& domain);
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/**
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Same as AddCatalog(const wxString&), but takes an additional argument,
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@a msgIdLanguage.
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@param domain
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The catalog domain to add.
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@param msgIdLanguage
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Specifies the language of "msgid" strings in source code
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(i.e. arguments to GetString(), wxGetTranslation() and the _() macro).
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It is used if AddCatalog() cannot find any catalog for current language:
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if the language is same as source code language, then strings from source
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code are used instead.
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@return
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@true if catalog was successfully loaded, @false otherwise (which might
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mean that the catalog is not found or that it isn't in the correct format).
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*/
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bool AddCatalog(const wxString& domain, wxLanguage msgIdLanguage);
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/**
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Same as AddCatalog(const wxString&, wxLanguage), but takes two
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additional arguments, @a msgIdLanguage and @a msgIdCharset.
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This overload is only available in non-Unicode build.
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@param domain
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The catalog domain to add.
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@param msgIdLanguage
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Specifies the language of "msgid" strings in source code
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(i.e. arguments to GetString(), wxGetTranslation() and the _() macro).
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It is used if AddCatalog() cannot find any catalog for current language:
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if the language is same as source code language, then strings from source
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code are used instead.
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@param msgIdCharset
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Lets you specify the charset used for msgids in sources
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in case they use 8-bit characters (e.g. German or French strings).
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@return
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@true if catalog was successfully loaded, @false otherwise (which might
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mean that the catalog is not found or that it isn't in the correct format).
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*/
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bool AddCatalog(const wxString& domain,
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wxLanguage msgIdLanguage,
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const wxString& msgIdCharset);
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/**
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Check if the given catalog is loaded, and returns @true if it is.
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According to GNU gettext tradition, each catalog normally corresponds to
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'domain' which is more or less the application name.
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@see AddCatalog()
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*/
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bool IsLoaded(const wxString& domain) const;
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/**
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Retrieves the translation for a string in all loaded domains unless the @a domain
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parameter is specified (and then only this catalog/domain is searched).
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Returns @NULL if translation is not available.
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This function is thread-safe.
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@remarks Domains are searched in the last to first order, i.e. catalogs
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added later override those added before.
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@since 3.0
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*/
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const wxString *GetTranslatedString(const wxString& origString,
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const wxString& domain = wxEmptyString) const;
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/**
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Retrieves the translation for a string in all loaded domains unless the @a domain
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parameter is specified (and then only this catalog/domain is searched).
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Returns @NULL if translation is not available.
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This form is used when retrieving translation of string that has different
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singular and plural form in English or different plural forms in some
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other language.
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@param origString The singular form of the string to be converted.
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@param n The number on which the plural form choice depends on.
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(In some languages, there are different plural forms
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for e.g. n=2 and n=3 etc., in addition to the singular
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form (n=1) being different.)
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@param domain The only domain (i.e. message catalog) to search if
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specified. By default this parameter is empty,
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indicating that all loaded catalogs should be
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searched.
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See GNU gettext manual for additional information on plural forms handling.
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This method is called by the wxGetTranslation() function and _() macro.
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This function is thread-safe.
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@remarks Domains are searched in the last to first order, i.e. catalogs
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added later override those added before.
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@since 3.0
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*/
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const wxString *GetTranslatedString(const wxString& origString,
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unsigned n,
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const wxString& domain = wxEmptyString) const;
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/**
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Returns the header value for header @a header.
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The search for @a header is case sensitive. If an @a domain is passed,
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this domain is searched. Else all domains will be searched until a
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header has been found.
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The return value is the value of the header if found. Else this will be empty.
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*/
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wxString GetHeaderValue(const wxString& header,
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const wxString& domain = wxEmptyString) const;
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};
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/**
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Abstraction of translations discovery and loading.
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This interface makes it possible to override wxWidgets' default catalogs
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loading mechanism and load MO files from locations other than the
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filesystem (e.g. embed them in executable).
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Implementations must implement the LoadCatalog() method.
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@see wxFileTranslationsLoader, wxResourceTranslationsLoader
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@since 2.9.1
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*/
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class wxTranslationsLoader
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{
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public:
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/// Trivial default constructor.
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wxTranslationsLoader();
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/**
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Called to load requested catalog.
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If the catalog is found, LoadCatalog() should create wxMsgCatalog
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instance with its data and return it. The caller will take ownership
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of the catalog.
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@param domain Domain to load.
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@param lang Language to look for. This is "canonical name"
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(see wxLocale::GetCanonicalName()), i.e. ISO 639
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code, possibly combined with country code or
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additional modifiers (e.g. "fr", "en_GB" or
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"ca@valencia").
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@return Loaded catalog or NULL on failure.
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*/
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virtual wxMsgCatalog *LoadCatalog(const wxString& domain,
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const wxString& lang) = 0;
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/**
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Implements wxTranslations::GetAvailableTranslations().
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*/
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virtual wxArrayString GetAvailableTranslations(const wxString& domain) const = 0;
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};
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/**
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Standard wxTranslationsLoader implementation.
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This finds catalogs in the filesystem, using the standard Unix layout.
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This is the default unless you change the loader with
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wxTranslations::SetLoader().
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Catalogs are searched for in standard places (system locales directory,
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`LC_PATH` on Unix systems, Resources subdirectory of the application bundle
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on OS X, executable's directory on Windows), but you may also prepend
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additional directories to the search path with
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AddCatalogLookupPathPrefix().
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@since 2.9.1
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*/
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class wxFileTranslationsLoader : public wxTranslationsLoader
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{
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public:
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/**
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Add a prefix to the catalog lookup path: the message catalog files will
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be looked up under prefix/lang/LC_MESSAGES and prefix/lang directories
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(in this order).
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This only applies to subsequent invocations of
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wxTranslations::AddCatalog().
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*/
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static void AddCatalogLookupPathPrefix(const wxString& prefix);
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};
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/**
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This loader makes it possible to load translations from Windows
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resources.
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If you wish to store translation MO files in resources, you have to
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enable this loader before calling wxTranslations::AddCatalog() or
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wxLocale::AddCatalog():
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@code
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wxTranslations::Get()->SetLoader(new wxResourceTranslationsLoader);
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@endcode
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Translations are stored in resources as compiled MO files, with type
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set to "MOFILE" (unless you override GetResourceType()) and name
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consisting of the domain, followed by underscore, followed by language
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identification. For example, the relevant part of .rc file would look
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like this:
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@code
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myapp_de MOFILE "catalogs/de/myapp.mo"
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myapp_fr MOFILE "catalogs/fr/myapp.mo"
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myapp_en_GB MOFILE "catalogs/en_GB/myapp.mo"
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@endcode
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This class is only available on Windows.
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@since 2.9.1
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*/
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class wxResourceTranslationsLoader : public wxTranslationsLoader
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{
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protected:
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/**
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Returns resource type to use for translations.
|
||
|
|
|
||
|
|
Default type is "MOFILE".
|
||
|
|
*/
|
||
|
|
virtual wxString GetResourceType() const;
|
||
|
|
|
||
|
|
/**
|
||
|
|
Returns handle of the module to load resources from.
|
||
|
|
|
||
|
|
By default, the main executable is used.
|
||
|
|
*/
|
||
|
|
virtual WXHINSTANCE GetModule() const;
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
Represents a loaded translations message catalog.
|
||
|
|
|
||
|
|
This class should only be used directly by wxTranslationsLoader
|
||
|
|
implementations.
|
||
|
|
|
||
|
|
@since 2.9.1
|
||
|
|
*/
|
||
|
|
class wxMsgCatalog
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
/**
|
||
|
|
Creates catalog loaded from a MO file.
|
||
|
|
|
||
|
|
@param filename Path to the MO file to load.
|
||
|
|
@param domain Catalog's domain. This typically matches
|
||
|
|
the @a filename.
|
||
|
|
|
||
|
|
@return Successfully loaded catalog or NULL on failure.
|
||
|
|
*/
|
||
|
|
static wxMsgCatalog *CreateFromFile(const wxString& filename,
|
||
|
|
const wxString& domain);
|
||
|
|
|
||
|
|
/**
|
||
|
|
Creates catalog from MO file data in memory buffer.
|
||
|
|
|
||
|
|
@param data Data in MO file format.
|
||
|
|
@param domain Catalog's domain. This typically matches
|
||
|
|
the @a filename.
|
||
|
|
|
||
|
|
@return Successfully loaded catalog or NULL on failure.
|
||
|
|
*/
|
||
|
|
static wxMsgCatalog *CreateFromData(const wxScopedCharBuffer& data,
|
||
|
|
const wxString& domain);
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
// ============================================================================
|
||
|
|
// Global functions/macros
|
||
|
|
// ============================================================================
|
||
|
|
|
||
|
|
/** @addtogroup group_funcmacro_string */
|
||
|
|
//@{
|
||
|
|
|
||
|
|
/**
|
||
|
|
This macro is identical to _() but for the plural variant of
|
||
|
|
wxGetTranslation().
|
||
|
|
|
||
|
|
@return A const wxString.
|
||
|
|
|
||
|
|
@header{wx/intl.h}
|
||
|
|
*/
|
||
|
|
#define wxPLURAL(string, plural, n)
|
||
|
|
|
||
|
|
/**
|
||
|
|
This macro doesn't do anything in the program code -- it simply expands to
|
||
|
|
the value of its argument.
|
||
|
|
|
||
|
|
However it does have a purpose which is to mark the literal strings for the
|
||
|
|
extraction into the message catalog created by @c xgettext program. Usually
|
||
|
|
this is achieved using _() but that macro not only marks the string for
|
||
|
|
extraction but also expands into a wxGetTranslation() call which means that
|
||
|
|
it cannot be used in some situations, notably for static array
|
||
|
|
initialization.
|
||
|
|
|
||
|
|
Here is an example which should make it more clear: suppose that you have a
|
||
|
|
static array of strings containing the weekday names and which have to be
|
||
|
|
translated (note that it is a bad example, really, as wxDateTime already
|
||
|
|
can be used to get the localized week day names already). If you write:
|
||
|
|
|
||
|
|
@code
|
||
|
|
static const char * const weekdays[] = { _("Mon"), ..., _("Sun") };
|
||
|
|
...
|
||
|
|
// use weekdays[n] as usual
|
||
|
|
@endcode
|
||
|
|
|
||
|
|
The code wouldn't compile because the function calls are forbidden in the
|
||
|
|
array initializer. So instead you should do this:
|
||
|
|
|
||
|
|
@code
|
||
|
|
static const char * const weekdays[] = { wxTRANSLATE("Mon"), ...,
|
||
|
|
wxTRANSLATE("Sun") };
|
||
|
|
...
|
||
|
|
// use wxGetTranslation(weekdays[n])
|
||
|
|
@endcode
|
||
|
|
|
||
|
|
Note that although the code @b would compile if you simply omit
|
||
|
|
wxTRANSLATE() in the above, it wouldn't work as expected because there
|
||
|
|
would be no translations for the weekday names in the program message
|
||
|
|
catalog and wxGetTranslation() wouldn't find them.
|
||
|
|
|
||
|
|
@return A const wxChar*.
|
||
|
|
|
||
|
|
@header{wx/intl.h}
|
||
|
|
*/
|
||
|
|
#define wxTRANSLATE(string)
|
||
|
|
|
||
|
|
/**
|
||
|
|
This function returns the translation of @a string in the current
|
||
|
|
@c locale(). If the string is not found in any of the loaded message
|
||
|
|
catalogs (see @ref overview_i18n), the original string is returned. In
|
||
|
|
debug build, an error message is logged -- this should help to find the
|
||
|
|
strings which were not yet translated. If @a domain is specified then only
|
||
|
|
that domain/catalog is searched for a matching string. As this function is
|
||
|
|
used very often, an alternative (and also common in Unix world) syntax is
|
||
|
|
provided: the _() macro is defined to do the same thing as
|
||
|
|
wxGetTranslation().
|
||
|
|
|
||
|
|
This function is thread-safe.
|
||
|
|
|
||
|
|
@note This function is not suitable for literal strings in Unicode builds
|
||
|
|
since the literal strings must be enclosed in wxT() macro which makes
|
||
|
|
them unrecognised by @c xgettext, and so they are not extracted to
|
||
|
|
the message catalog. Instead, use the _() and wxPLURAL() macro for
|
||
|
|
all literal strings.
|
||
|
|
|
||
|
|
@see wxGetTranslation(const wxString&, const wxString&, unsigned, const wxString&)
|
||
|
|
|
||
|
|
@header{wx/intl.h}
|
||
|
|
*/
|
||
|
|
const wxString& wxGetTranslation(const wxString& string,
|
||
|
|
const wxString& domain = wxEmptyString);
|
||
|
|
|
||
|
|
/**
|
||
|
|
This is an overloaded version of
|
||
|
|
wxGetTranslation(const wxString&, const wxString&), please see its
|
||
|
|
documentation for general information.
|
||
|
|
|
||
|
|
This version is used when retrieving translation of string that has
|
||
|
|
different singular and plural forms in English or different plural forms in
|
||
|
|
some other language. Like wxGetTranslation(const wxString&,const wxString&),
|
||
|
|
the @a string parameter must contain the singular form of the string to be
|
||
|
|
converted and is used as the key for the search in the catalog. The
|
||
|
|
@a plural parameter is the plural form (in English). The parameter @a n is
|
||
|
|
used to determine the plural form. If no message catalog is found,
|
||
|
|
@a string is returned if "n == 1", otherwise @a plural is returned.
|
||
|
|
|
||
|
|
See GNU gettext Manual for additional information on plural forms handling:
|
||
|
|
<http://www.gnu.org/software/gettext/manual/gettext.html#Plural-forms>
|
||
|
|
For a shorter alternative see the wxPLURAL() macro.
|
||
|
|
|
||
|
|
This function is thread-safe.
|
||
|
|
|
||
|
|
@header{wx/intl.h}
|
||
|
|
*/
|
||
|
|
const wxString& wxGetTranslation(const wxString& string,
|
||
|
|
const wxString& plural, unsigned n,
|
||
|
|
const wxString& domain = wxEmptyString);
|
||
|
|
|
||
|
|
/**
|
||
|
|
Macro to be used around all literal strings that should be translated.
|
||
|
|
|
||
|
|
This macro expands into a call to wxGetTranslation(), so it marks the
|
||
|
|
message for the extraction by @c xgettext just as wxTRANSLATE() does, but
|
||
|
|
also returns the translation of the string for the current locale during
|
||
|
|
execution.
|
||
|
|
|
||
|
|
This macro is thread-safe.
|
||
|
|
|
||
|
|
@header{wx/intl.h}
|
||
|
|
*/
|
||
|
|
const wxString& _(const wxString& string);
|
||
|
|
|
||
|
|
//@}
|
||
|
|
|