QML Internationalization Example

changsheng230

Hi,

Just pick up Qt i18n, and I follow the 4.7 i18n "example":http://developer.qt.nokia.com/doc/qt-4.7/declarative-i18n.html#id-1f296103-c860-4eb8-b188-57e4fb754359, with following code:

@import QtQuick 1.0

//
// The QML runtime automatically loads a translation from the i18n subdirectory of the root
// QML file, based on the system language.
//
// The files are created/updated by running:
//
// lupdate i18n.qml -ts i18n/base.ts
//
// Translations for new languages are created by copying i18n/base.ts to i18n/qml_<lang>.ts
// The .ts files can then be edited with Linguist:
//
// linguist i18n/qml_fr.ts
//
// The run-time translation files are then generaeted by running:
//
// lrelease i18n/*.ts
//

Rectangle {
width: 640; height: 480

Column {
    anchors.fill: parent; spacing: 20

    Text {
        text: "If a translation is available for the system language (eg. French) then the

string below will translated (eg. 'Bonjour'). Otherwise it will show 'Hello'."
width: parent.width; wrapMode: Text.WordWrap
}

    Text {
        text: qsTr("Hello")
        font.pointSize: 25; anchors.horizontalCenter: parent.horizontalCenter
    }
}

}
@

but did not get the translated "Bonjour" string on the running application. Any hints?

Further question is that if I have two qm files ,say qml_fr.qm and qml_ge.qm. How will the application know the string will be translated into French or German?

mlong

If you're using the qmlviewer app to view the code (which I think the example is assuming you're doing) the source for the viewer contains:

@
void QDeclarativeViewer::loadTranslationFile(const QString& directory)
{
if (!translator) {
translator = new QTranslator(this);
QApplication::installTranslator(translator);
}

translator->load(QLatin1String("qml_" )+QLocale::system&#40;&#41;.name(), directory + QLatin1String("/i18n"));

}
@

So the magic happens in line 8 where it queries QLocale::system().name() and loads the translation file.

If you're using a hybrid C++/QML app, or using the QmlApplicationViewer class that's generated by the Qt Creator wizard, then you'd have to load the translation files manually, which is documented "here.":http://developer.qt.nokia.com/doc/qt-4.7/internationalization.html

changsheng230

Thank you, mlong !
[quote author="mlong" date="1310750407"]If you're using the qmlviewer app to view the code (which I think the example is assuming you're doing) the source for the viewer contains:

@
void QDeclarativeViewer::loadTranslationFile(const QString& directory)
{
if (!translator) {
translator = new QTranslator(this);
QApplication::installTranslator(translator);
}

translator->load(QLatin1String("qml_" )+QLocale::system&#40;&#41;.name(&#41;, directory + QLatin1String("/i18n"));

}
@

So the magic happens in line 8 where it queries QLocale::system().name() and loads the translation file.

If you're using a hybrid C++/QML app, or using the QmlApplicationViewer class that's generated by the Qt Creator wizard, then you'd have to load the translation files manually, which is documented "here.":http://developer.qt.nokia.com/doc/qt-4.7/internationalization.html[/quote]

SteveKing

Don't forget that dynamic translation isn't well (at all) supported in QML. So if you're going to be changing language at runtime you need to take a look at "this thread":http://developer.qt.nokia.com/forums/viewthread/3307/ .