This is an overview of how the code is situated and a very brief overview of what the classes do. See the header files for a more indepth overview of what the classes do.
-- System Settings classes --
mainwindow - The KMainWindow contains KActions, the stack of the iconlist and the current module(s) view.
modulesview - The widget that is the icon view that users see when the first enter the app.
kcmsearch - Search widget that can search ModulesView and enable/disable items.
modulesiconitem - The individual modules items. Used for loading enabled/disabled images and storing the list of modules acosiated with the item.
kcmodulemenu - Class that reads in a freedesktop.org .menu file into a QValueList.
kcmultiwidget - A basterdized kcmultidialog from tdelibs/kutil that provides info about the current shown dialog so the about dialog and caption can be updated and prompts for unsaved changes.