translate on fly

[Noxxik]

Hi I have some problem. I want to translate my programm on fly. I have this code

void MainWindow::changeLanguage(QAction *action)
{
 
    if(action == engLAction){
    QTranslator translator;
        translator.load(QString("programm_en"), "." );
    qApp->installTranslator(&translator);
    }
    else if(action == czeLAction){
    QTranslator translator;
        translator.load(QString("programm_cs"), "." );
    qApp->installTranslator(&translator);
    }
 
}

void MainWindow::changeLanguage(QAction *action)
{

    if(action == engLAction){
    QTranslator translator;
        translator.load(QString("programm_en"), "." );
    qApp->installTranslator(&translator);
    }
    else if(action == czeLAction){
    QTranslator translator;
        translator.load(QString("programm_cs"), "." );
    qApp->installTranslator(&translator);
    }

}

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before make I use "lupdate programm.pro" and "lrelease programm.pro" then I translate documents in *.ts and use "lrelease programm.pro" again. Then I use make.
But when I try to change language on fly nothing happens Could someone help me, where I make mistake? thanks to all

[caduel]

your QTranslators get destroyed when they go out of scope. You are (un)lucky this code does not crash.

[^NyAw^]

Hi,

Define the QTranslator as a member variable and load the proper language. Then, when "changeLanguage" is called, you have to set all the widget texts:

widget1.setText(tr("Hello")); //This will return your translation depending on language loaded

[Noxxik]

Hi,

Define the QTranslator as a member variable and load the proper language. Then, when "changeLanguage" is called, you have to set all the widget texts:

thanks now it is OK, but I thought, that the translation will use *.ts or *.qm files, which I generate with lupdate, lrelease.
So I think, that i dont use this *.ts and *.qm files, isnt it?

[jpn]

See [WIKI]Dynamic translation[/WIKI].

[Bjoern]

So I think, that i dont use this *.ts and *.qm files, isnt it?

You're still requiring the qm files to be loaded and do your stuff (with global member, of course) - but the translator can only work dynamically when you're following the guides from Wiki.
That's simply because usually you setup static text once (e.g. in constructor) - where the tr-function handles the translation.
Once your text is assigned, installing a new translator will only affect any text being processed by tr-function again