Still need help: Best way to have application "skins"?

[wysota]

Ok, I'm sorry but I don't understand what you mean by having a base and 2 subclasses...

Hmm... you know what a "class" in object oriented language is, right?

I have 2 seperate ui files with different styles. The "plain" one contains just the essentials, nothing more than a simple form with no style whats so ever(Other than the style Qt gives to it at run time, based on the OS). Then, I have a "fancy" one which includes the core functions and buttons, etc, but also contains some different actions in the constructor(like setMask()). It also has a different style, like different images, integrated style sheets in Qt Designer, and more.

Yes, I have read what you had written

In my program I want to let the user chose which style he wants. After he chooses, the program restarts, and reads from QSettings what he wants. If it's the fancy style, the program should read the "fancy" ui file and perform extra operations on the main window, in addition to the core commands.
However, if it's plain, then the program should read the "plain" ui file, and only do the core commands.

Do both these UI contain the same widgets (just positioned or styled differently)? Could you maybe attach them to your post so that we may have a look at them? If you only wish to change the look of your widget, you don't need two separate UI files - you can apply different stylesheets on the same set of widgets or set a different style on the widget.