Switch QTranslator at runtime?

[whitefurrows]

How can i change QTranslator dynamic? I try this:

int main(int argc, char** argv)
{
QApplication app( argc, argv );
 
//...
 
if (language=="de"){
   QTranslator* translator = new QTranslator();
   translator->load(":/translation/language + ".qm");
   app.installTranslator(translator);
}
 
//...
}
 
___________________________________________________________________________
 
 
void ApplicationSetup::switchLanguage()
{
   static QTranslator* translator=0; 
 
   if (translator) 
   { 
      qApp->removeTranslator(translator); 
      delete translator; 
   } 
 
   translator = new QTranslator(0); 
 
   if (language =="en") 
   {
      translator->load(":/translation/language + ".qm"); 
      qApp->installTranslator( translator ); 
   }
}

int main(int argc, char** argv)
{
QApplication app( argc, argv );

//...

if (language=="de"){
   QTranslator* translator = new QTranslator();
   translator->load(":/translation/language + ".qm");
   app.installTranslator(translator);
}

//...
}

___________________________________________________________________________


void ApplicationSetup::switchLanguage()
{
   static QTranslator* translator=0; 

   if (translator) 
   { 
      qApp->removeTranslator(translator); 
      delete translator; 
   } 

   translator = new QTranslator(0); 

   if (language =="en") 
   {
      translator->load(":/translation/language + ".qm"); 
      qApp->installTranslator( translator ); 
   }
}

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The language don’t change at runtime. I use ui-files and classes code by hand. All strings look like this tr("Please translate me").

Can somebody tell me how can i translate all strings in all open widgets at runtime?

Thanks in advance,

Whitefurrows

[jpn]

QtCentre Wiki: Dynamic translation

[whitefurrows]

Hi,

thank you for the example, that’s good, but i have one more question.

My QMainWindow is build without Designer and i can’t use ui.retranslateUi(this);. How can i translate the strings in my QMainWindow?

Is it right that i must use the following code in all Widgets, wich build with the designer to translate the strings?

void MyWindow::changeEvent(QEvent* event)
   {
       if (event ->type() == QEvent::LanguageChange)
       {
           // retranslate designer form (single inheritance approach)
           ui.retranslateUi(this);
 
           // retranslate other widgets which weren't added in designer
           retranslate();
       }
 
       // remember to call base class implementation
       QMainWindow::changeEvent(event);
   }

void MyWindow::changeEvent(QEvent* event)
   {
       if (event ->type() == QEvent::LanguageChange)
       {
           // retranslate designer form (single inheritance approach)
           ui.retranslateUi(this);
           
           // retranslate other widgets which weren't added in designer
           retranslate();
       }
       
       // remember to call base class implementation
       QMainWindow::changeEvent(event);
   }

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How can i tell the designer, don’t translate all strings? I want translate only definite strings.

Another problem is, the designer translate html in the strings. How can i tell the disigner translate the strings without html?

Thanks in advance,

Whitefurrows

[wysota]

If you don't use Designer, you have to implement your own method for retranslating strings (in the above example it is called retranslate()) and you have to call it on every language change.

[whitefurrows]

Hi,

thank you, but i have a problem.

I do this e.g.:

void MyMainWindow::createActions()
{
   actionOpen = new QAction(QIcon(":/myPic.png"), tr("&Open File"), this);
}

void MyMainWindow::createActions()
{
   actionOpen = new QAction(QIcon(":/myPic.png"), tr("&Open File"), this);
}

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and i must do this:

void MyMainWindow::retranslate()
{
   actionOpen->setText(tr("&Datei öffnen"));
}

void MyMainWindow::retranslate()
{
   actionOpen->setText(tr("&Datei öffnen"));
}

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I think that’s dirty and a lot to do, but it’s OK.

What can i do in a function like that:

void AnyWidget::anyFunction(){
QString html;
 
html.append("<table border=\"0\" width=\"100%\">");
html.append("<tr><td>" + tr("Text to Translate") + "</td>");
html.append("<td>" + tr("Text to Translate") + "</td></tr>");
html.append("</table>");
 
myTextEdit->document()->setHtml(html);
}

void AnyWidget::anyFunction(){
QString html;

html.append("<table border=\"0\" width=\"100%\">");
html.append("<tr><td>" + tr("Text to Translate") + "</td>");
html.append("<td>" + tr("Text to Translate") + "</td></tr>");
html.append("</table>");

myTextEdit->document()->setHtml(html);
}

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I can’t translate in retranslate()

Thanks in advance,

Whitefurrows

[jpn]

I do this e.g.:

void MyMainWindow::createActions()
{
   actionOpen = new QAction(QIcon(":/myPic.png"), tr("&Open File"), this);
}

void MyMainWindow::createActions()
{
   actionOpen = new QAction(QIcon(":/myPic.png"), tr("&Open File"), this);
}

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and i must do this:

void MyMainWindow::retranslate()
{
   actionOpen->setText(tr("&Datei öffnen"));
}

void MyMainWindow::retranslate()
{
   actionOpen->setText(tr("&Datei öffnen"));
}

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I think that’s dirty and a lot to do, but it’s OK.

Hmm, you are not supposed to hardcode all the languages in the code. Use only one string in code and then use translation files to translate it to any language you want.

void MyMainWindow::createActions()
{
   actionOpen = new QAction(QIcon(":/myPic.png"), tr("&Open File"), this);
}
void MyMainWindow::retranslate()
{
   actionOpen->setText(tr("&Open File")); // same string here, put "&Datei öffnen" into the translation file
}

void MyMainWindow::createActions()
{
   actionOpen = new QAction(QIcon(":/myPic.png"), tr("&Open File"), this);
}
void MyMainWindow::retranslate()
{
   actionOpen->setText(tr("&Open File")); // same string here, put "&Datei öffnen" into the translation file
}

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[whitefurrows]

Hi,

ok i think i have understood, but what can i do with a function like that:

void AnyWidget::anyFunction(){
QString html;
 
html.append("<table border=\"0\" width=\"100%\">");
html.append("<tr><td>" + tr("Text to Translate") + "</td>");
html.append("<td>" + tr("Text to Translate") + "</td></tr>");
html.append("</table>");
 
myTextEdit->document()->setHtml(html);
}

void AnyWidget::anyFunction(){
QString html;

html.append("<table border=\"0\" width=\"100%\">");
html.append("<tr><td>" + tr("Text to Translate") + "</td>");
html.append("<td>" + tr("Text to Translate") + "</td></tr>");
html.append("</table>");

myTextEdit->document()->setHtml(html);
}

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Thanks in advance,

Whitefurrows

[jpn]

There is no other way around than somehow identifying the translated parts (using regexp maybe?) and then setting the translated text again after passing it to tr().

[whitefurrows]

Hi,

sorry i don't know what are you mean. Can you give me a example please.

Thanks in advance,

Whitefurrows

[wysota]

I think that in that situation you should tr() the whole html code and provide translations for it in the translation file.

html->append(tr("<HTML><BODY>Text to be translated goes here<BR>\\n"
"and you can even have arguments for it like this: %1</BODY></HTML>")
.arg(tr("Some argument")));

html->append(tr("<HTML><BODY>Text to be translated goes here<BR>\\n"
"and you can even have arguments for it like this: %1</BODY></HTML>")
.arg(tr("Some argument")));

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[whitefurrows]

Hi,

thank you, but this is not my problem. I have attach a example and hope you can help me.

Thanks in advance,

Whitefurrows