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#!/usr/bin/env python
# switch translations dynamically in a PyQt4 application
#
# PyQt version by Hans-Peter Jansen <hpj@urpla.net>
#
# Based on an example from jpn on July 17 2006 found here:
#
# http://www.qtcentre.org/wiki/index.php?title=Dynamic_translation_in_Qt4_applications
#
# Since the original version didn't carry any license,
# I've add this one:
#
# This program is free software. It comes without any warranty, to
# the extent permitted by applicable law. You can redistribute it
# and/or modify it under the terms of the Do What The Fuck You Want
# To Public License, Version 2, as published by Sam Hocevar. See
# http://sam.zoy.org/wtfpl/COPYING for more details.
import sys
import sip
sip.setapi('QString', 2)
sip.setapi('QVariant', 2)
from PyQt4 import QtCore, QtGui
from ui_mainwindow import Ui_MainWindow
import lang_rc
class Application(QtGui.QApplication):
translators = {}
current = None
def __init__(self, argv):
super(Application, self).__init__(argv)
def loadTranslations(self, folder):
if not isinstance(folder, QtCore.QDir):
folder = QtCore.QDir(folder)
pattern = "*_*.qm" # <language>_<country>.qm
filters = QtCore.QDir.Files | QtCore.QDir.Readable
sort = QtCore.QDir.SortFlags(QtCore.QDir.Name)
for langFile in folder.entryInfoList([pattern], filters, sort):
# pick country and language out of the file name
language, country = langFile.baseName().split("_", 1)
language = language.lower()
country = country.upper()
locale = language + "_" + country
# only load translation, if it does not exist already
if not locale in Application.translators:
# create and load translator
translator = QtCore.QTranslator(self.instance())
if translator.load(langFile.absoluteFilePath()):
Application.translators[locale] = translator
@staticmethod
def availableLanguages():
return sorted(Application.translators.keys())
@staticmethod
def setLanguage(locale):
#print "Application.setLanguage(%s)" % locale
if Application.current:
Application.removeTranslator(Application.current)
Application.current = Application.translators.get(locale, None)
if Application.current is not None:
Application.installTranslator(Application.current)
class MainWindow(QtGui.QMainWindow):
def __init__(self, parent = None, flags = 0):
super(MainWindow, self).__init__(parent, QtCore.Qt.WindowFlags(flags))
self.languages = QtGui.QMenu()
self.ui = Ui_MainWindow()
self.ui.setupUi(self)
self.fillLanguages()
self.retranslate()
def changeEvent(self, event):
if event.type() == QtCore.QEvent.LanguageChange:
# all designed forms have a retranslateUi() method
self.ui.retranslateUi(self)
# retranslate other widgets which weren't added in the designer
self.retranslate()
super(MainWindow, self).changeEvent(event)
@QtCore.pyqtSlot(QtGui.QAction)
def setLanguage(self, action):
Application.setLanguage(action.data())
def fillLanguages(self):
self.languages = self.menuBar().addMenu("")
# make a group of language actions
actions = QtGui.QActionGroup(self)
actions.triggered.connect(self.setLanguage)
system = QtCore.QLocale.system()
default = None
for lang in Application.availableLanguages():
# figure out nice names for locales
locale = QtCore.QLocale(lang)
language = QtCore.QLocale.languageToString(locale.language())
country = QtCore.QLocale.countryToString(locale.country())
name = "%s (%s)" % (language, country)
# create an action
action = self.languages.addAction(name)
action.setData(lang)
action.setCheckable(True)
if lang == system.name():
# language match the current system
action.setChecked(True)
Application.setLanguage(lang)
default = lang
actions.addAction(action)
if default is None:
# no exact match found, try language only
for lang in Application.availableLanguages():
locale = QtCore.QLocale(lang)
if locale.language() == system.language():
# at least a language match
for action in actions.actions():
if lang == action.data():
# use first entry of this language
action.setChecked(True)
Application.setLanguage(lang)
default = lang
break
if default is not None:
break
return default
def retranslate(self):
self.languages.setTitle(self.tr("Language"))
if __name__ == "__main__":
app = Application(sys.argv)
app.loadTranslations(":/lang")
mainWindow = MainWindow()
mainWindow.show()
app.lastWindowClosed.connect(app.quit)
sys.exit(app.exec_())
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