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# -*- coding: utf-8 -*-
#
# Author: Werner F. Bruhin
# Purpose: how to I18N enable an application
#
# Inspired by the I18N wxPython demo and the Internationalization page on
# the wxPython wiki.
#
import sys
import os
import wx
# Install a custom displayhook to keep Python from setting the global
# _ (underscore) to the value of the last evaluated expression. If
# we don't do this, our mapping of _ to gettext can get overwritten.
# This is useful/needed in interactive debugging with PyShell.
def _displayHook(obj):
if obj is not None:
print (repr(obj))
# add translation macro to builtin similar to what gettext does
import builtins
builtins.__dict__['_'] = wx.GetTranslation
import app_const as appC
from wx.lib.mixins.inspection import InspectionMixin
class BaseApp(wx.App, InspectionMixin):
def OnInit(self):
self.Init() # InspectionMixin
# work around for Python stealing "_"
sys.displayhook = _displayHook
self.appName = "I18N sample application"
self.doConfig()
self.locale = None
wx.Locale.AddCatalogLookupPathPrefix('locale')
self.updateLanguage(self.appConfig.Read(u"Language"))
return True
def doConfig(self):
"""Setup an application configuration file"""
# configuration folder
sp = wx.StandardPaths.Get()
self.configLoc = sp.GetUserConfigDir()
self.configLoc = os.path.join(self.configLoc, self.appName)
# win: C:\Users\userid\AppData\Roaming\appName
# nix: \home\userid\appName
if not os.path.exists(self.configLoc):
os.mkdir(self.configLoc)
# AppConfig stuff is here
self.appConfig = wx.FileConfig(appName=self.appName,
vendorName=u'who you wish',
localFilename=os.path.join(
self.configLoc, "AppConfig"))
if not self.appConfig.HasEntry(u'Language'):
# on first run we default to German
self.appConfig.Write(key=u'Language', value=u'de')
self.appConfig.Flush()
def updateLanguage(self, lang):
"""
Update the language to the requested one.
Make *sure* any existing locale is deleted before the new
one is created. The old C++ object needs to be deleted
before the new one is created, and if we just assign a new
instance to the old Python variable, the old C++ locale will
not be destroyed soon enough, likely causing a crash.
:param string `lang`: one of the supported language codes
"""
# if an unsupported language is requested default to English
if lang in appC.supLang:
selLang = appC.supLang[lang]
else:
selLang = wx.LANGUAGE_ENGLISH
if self.locale:
assert sys.getrefcount(self.locale) <= 2
del self.locale
# create a locale object for this language
self.locale = wx.Locale(selLang)
if self.locale.IsOk():
self.locale.AddCatalog(appC.langDomain)
else:
self.locale = None
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