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In CTK+ 3.0, CtkStyleContext was added to replace CtkStyle and the theming infrastructure available in 2.x. CtkStyleContext is an object similar in spirit to CtkStyle, as it contains theming information, although in a more complete and tokenized fashion. There are two aspects to switching to CtkStyleContext: porting themes and theme engines, and porting applications, libraries and widgets.
From CTK+ 3.0 on, theme engines must implement CtkThemingEngine and be
installed in $libdir/ctk+-3.0/$CTK_VERSION/theming-engines,
and the files containing style information must be written in the CSS-like
format that is understood by CtkCssProvider. For a theme named
"Clearlooks", the CSS file parsed by default is
$datadir/themes/Clearlooks/ctk-3.0/ctk.css,
with possible variants such as the dark theme being named
ctk-dark.css in the same directory.
If your theme RC file was providing values for CtkSettings, you
can install a settings.ini keyfile along with
the ctk.css to provide theme-specific defaults
for settings.
Key themes have been converted to CSS syntax too. See the
CtkCssProvider documentation
information about the syntax. CTK+ looks for key themes in the file
$datadir/themes/, where theme/ctk-3.0/ctk-keys.csstheme is the current
key theme name.