See source code of gid_themes package inside the scripts folder.
Return the list of available themes
Some theme options can be accesed to get/set as GiD variables, with the GiD_Set command
- Theme(Current) ?<theme_name>?
To get or set the current theme in use (to set a theme it is necessary a GiD restart)
Integer index that represent the incons collection size (small, medium, large,...)
On Mac OS X: use traditional Apple's menu bar intead of embed the menu bar inside the GiD main window
On Windows: use native menus
On Linux: is the same as generic
generic: Use Tk buttons for the menus
Double value to scale the icons (1.0 by default), to avoid problems with some screen resolutions.