[Qt-interest] KDE/Gnome/Mac platform standards and guidelines

[Nikos Chantziaras]

Every platform has its own user interface standards and guidelines, 
which I wish to follow.  In this particular case, it's about 
configuration dialogs.  For example, on OS X, users expect changes to 
apply immediately when changing something.  There should be no 
Apply/Cancel/etc buttons.  This is no problem, I can simply use the 
Q_WS_MAC macro.

With Gnome and KDE however, it's not so easy to tell in which 
environment the app is running.  In KDE, there should be OK/Apply/Cancel 
buttons.  In Gnome, there should only be a Close button, or, as in OS X, 
no button at all.

In MS Windows, no one cares.

So in the Gnome/KDE case, what should I do to tell which standard to 
follow?  How do I detect this at runtime in order to adapt application 
behavior?