The direction of the showing of windows.

[jacek]

How about QApplication::reverseLayout()?

[Mad Max]

This method indicates current state. Unfortunately Qt does not set this flag automatically and each application should install the flag itself. The condition for the installation can be found only in the file of localization, reading a tag "QT_LAYOUT_DIRECTION". If you will look at qapplication.cpp then you can to see, how Trolls done this trouble themselves. They solved it by the same way .