Changing languages dynamically

Sometimes, people want to use languages other than the one specified by the system locale. This is a matter of application of the customized settings. This usually means restarting the application in order to load the corresponding translation file. This is partly because changing the language dynamically requires additional work. However, it's feasible and can be done with some lines. What's more important is that it delivers a better user experience!

Let's add a new push button to MainWindow. Name it loadButton and change its text to Load/Unload Translation. Then, edit the main.cpp file in the Edit mode. Remove all QTranslator related lines, as we'll be implementing this dynamic language switch in the MainWindow class. The main.cpp file should look like the originally generated one as follows:

#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
  QApplication a(argc, argv);
  MainWindow w;
  w.show();

  return a.exec(...