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The user.cfg XML file contains a hierarchical list of all the preferences used by FreeCAD.

Each module has its own branch of the hierarchy starting under Preferences/Mod.

There are two ways of updating preferences:

• the Tools > Edit parameters menu entry

  • this is a general purpose preference editor that can change any parameter in the hierarchy. This editor does not perform any validation or suggest valid values.

• custom preference dialogs

  • a sample dialog
  • these dialogs use custom FreeCAD widgets to update preference values. Each preference widget has two special properties: prefEntry and prefPath. prefPath is the identifies the branch of the preference hierarchy and prefEntry identifies the leaf node to be updated.
  • two entries are needed in the dialog for each preference value - onSave() in saveSettings and onRestore() in loadSettings().

Preference values are retrieved (and sometimes set) using functions from Base/Parameter.cpp.

Good examples of retrieving parameters can be found in:

• Python: get_param() in /Mod/Draft/draftutils/util.py
• C++: various methods in /Mod/TechDraw/App/Preferences.cpp

See also

• Preference Editor wiki entry