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This chapter is from the book

This chapter is from the book

Introduction to Design Patterns in C++ with Qt 4, AnIntroduction to Design Patterns in C++ with Qt 4, An

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This chapter is from the book

This chapter is from the book

Introduction to Design Patterns in C++ with Qt 4, AnIntroduction to Design Patterns in C++ with Qt 4, An

Learn More Buy

9.6 tr() and Internationalization

If you are writing a program that will ever be translated into another language (internationalization), Qt Linguist and Qt translation tools have already solved the problem of how to organize and where to put the translated strings. To prepare our code for translation, we use QObject::tr() to surround any translatable string in our application. The tr() function is generated for every QObject and places its international strings in its own "namespace," which has the same name as the class.

tr() serves two purposes:

  1. It makes it possible for Qt's lupdate tool to extract all of the translatable string literals.
  2. If a translation is available, and the language has been selected, the strings will actually be translated into the selected language at runtime.

If no translation is available, tr() returns the original string.

NOTE

It is important that each translatable string is indeed fully inside the tr() function and extractable at compile time. For strings with parameters, use the QString::arg() function to place parameters inside translated strings. For example,

statusBar()->message
(tr("%1 of %2 complete. progress: %3%%")
.arg(processed).arg(total).arg(percent));

This way, translations can place the parameters in different order in situations where language changes the order of words/ideas.

For a much more complete guide to internationalization, we recommend [Blanchette06], written by one of Linguist's lead developers.

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