qtranslator with dynamic labels

[A Former User]

@J.Hilk yes, I have:

void MainWindow::changeEvent(QEvent* event)
{
    if(event->type() == QEvent::LanguageChange)
    {
        ui->retranslateUi(this);
    }

    QWidget::changeEvent(event);
}

and then:

void MainWindow::on_Traduzione_Inglese_clicked()
{
    qApp->installTranslator(&Lingua_Italiana);
    ui->Traduzione_Italiano->setDisabled(false);
    // if(ui->info->text=="CONF. IN CARICAMENTO")
    if(ui->Info->text()=="CONF. IN CARICAMENTO")

        ui->Info->setText("cONF..lOADING");
}

if I have a function like this:

void MainWindow::Caricamento()
{
    ui->Configurazione_Attuale->setText(selected_file_name);
    ui->Info->setText("CONF. CARICATA");
}

i can write ui->Info->setText(tr(....
but how I can call the function in change event, because I have other functions in Caricamento

[A Former User]

@vale88 must I add something in qt linguist? I don't understand

[mrjj]

@vale88
all text must be flagged with TR
so
ui->Info->setText( tr("cONF..lOADING") );

Then you extract the texts using the tool
use qt linguist to do the actual translation. (adding the translated text)
for the languages you support.
Then produced the compiled text qm and use that with
installTranslator

The rules for what text it will extract is talked about here
https://doc.qt.io/qt-5/i18n-source-translation.html

Also for any dynamically created QLabel, you must also call its setText again.

[A Former User]

@mrjj I added tr but it doesn't work, I use qt linguist but I can see only words fixed and not label dynamic, how can I do?

[mrjj]

@vale88
well how do you set the dynamic labels ?

it should be something like

QLabel *lab= new QLabel(this)
lab->setText( tr("my text") );

[A Former User]

This post is deleted!

[mrjj]

@vale88
Hi
You have to find out why it does not see the texts and extracts them.

[J.Hilk]

@vale88 have you run lupdate after adding the tr tags around your dynamic labels ?

[A Former User]

@J.Hilk MY PROBLEM is: if I have some words that I write during the code:
example:ui->info->setText("ciao");
to translate ciao I have write:
ui->infpo->setText(tr("ciao"));
but IT DOESN'T work, I think because "ciao" isn't in my dictionary, how cAN i DO TO ADD?

[mrjj]

@vale88
try run lupdate a few times.
It does work that way.

[A Former User]

@mrjj I don't know lupdate, I searched but I don't know I can use it

[mrjj]

and you need to have in your .pro file
TRANSLATIONS = myApp_it.ts
where the names are correct.

[A Former User]

@mrjj i did this,maybe must I add some word in disctionary?

[mrjj]

@vale88
If it does not see the texts, im not sure later the translation will work.
Also, as far as i know, you can't add manual text in qt linguist. at least i didn't see any menu for that.

[Pablo J. Rogina]

@mrjj said in qtranslator with dynamic labels:

Also, as far as i know, you can't add manual text in qt linguist. at least i didn't see any menu for that.

you could edit the XML file manually, but that's not a good idea.

@vale88 please review the documentation suggested previously. As a summary you should:

1. Enclose all the strings you want translated with tr() method in your code
2. Set property translatable checked for all the texts you want translated in the UI (when using Qt Designer)
3. Have a languagueChange() method in every class you want translated on the fly (if you want the user to switch languages with the application running). The method will be called automatically in response to a new translator being installed. Pseudo-code:

void YourClass::languageChange()
{
// all strings in UI form for this class will be retranslated here 
    ui->retranslateUi(this);
// Use following approach for setting a translated string other than the one you set in Designer
    ui->label->setText(tr("set label value to a different one from what you used in UI Designer")); 
}

3. Add the desired language(s) to your project (.pro) file:

TRANSLATIONS = yourApp_it.ts /
    yourApp_es.ts /
    yourApp_frts

4. run lupdate in your project's root folder. In the example above, you'll end up with 3 files to translate (Italian, Spanish, French)
5. Run linguist and open the *.ts file and provide the proper translations for the desired language(s)
6. Run lrelease to convert the translated .ts file(s) into .qm files (binary format)
7. In your application, install the proper translator (.qm file) for the selected language
8. Enjoy!

Just in case from your previous snippet:

void MainWindow::on_Traduzione_Inglese_clicked()
{
    qApp->installTranslator(&Lingua_Italiana);
    ui->Traduzione_Italiano->setDisabled(false);
    // if(ui->info->text=="CONF. IN CARICAMENTO")
    if(ui->Info->text()=="CONF. IN CARICAMENTO")

        ui->Info->setText("cONF..lOADING");
});
}

it looks like the method is called when a button for "English Transalation" is clicked but you seem to load the Italian translator. In addition, it's a good approach to check that the translator did actually was installed properly, i.e. (pseudo-code again):

bool loaded = m_translator->load(pagePrefix +'_'+ locale);
if (!loaded)
    qWarning() << QString("can't load %1 translation").arg(locale);

[A Former User]

@Pablo-J.-Rogina I want to translate from italian to english, so how must i write in .pro?
and an other question, if I write manually,like this..

void MainWindow::on_Traduzione_Inglese_clicked()
{
    qApp->installTranslator(&Lingua_Italiana);
    ui->Traduzione_Italiano->setDisabled(false);
    // if(ui->info->text=="CONF. IN CARICAMENTO")
    if(ui->Info->text()=="CONF. IN CARICAMENTO")

        ui->Info->setText("cONF..lOADING");
}

in Info doesn't wtite conf loading..because installTranslaton block this I think

[Pablo J. Rogina]

@vale88 it looks like you're not following the suggestions, like reading the documentation...

[A Former User]

@Pablo-J.-Rogina yes I read but if I must translate from italian to english,I must write.
TRANSLATIONS = yourApp_en.ts ?

[mrjj]

@vale88
Hi
The ts files can be named anything.
it is just a normal convention to name them
appname_languagecode.ts
as then the filename can be constructed based on locale
But yes, your English language could be
TRANSLATIONS = yourApp_en.ts
and you simply used that name to load it.

[A Former User]

@mrjj ok, so with this I call a file ts that I must build? it's not automatic..sorry but i read documentation but i don't find a example clear