gtk2/gtk/theme/Adwaita/README
Christoph Reiter 4071e1e734 build: require sassc and drop generated .css files
Instead of requiring sassc to be installed add meson subprojects
which build libsass and sassc (currently both forks of mine, tested
under linux/mingw/msvc) when needed.

This allows us to drop the generated .css files and build scripts from git.

See #1502
2020-01-30 20:45:38 +01:00

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Summary
-------
* To be able to use the latest/adequate version of sass, install sassc
* meson will regenerate the CSS every time you modify the SCSS files.
* Note that meson always builds out-of-tree, so the modified css files will
appear in your builddir.
How to tweak the theme
----------------------
Adwaita is a complex theme, so to keep it maintainable it's written and
processed in SASS. The generated CSS is then transformed into a gresource file
during gtk build and used at runtime in a non-legible or editable form.
It is very likely your change will happen in the _common.scss file. That's where
all the widget selectors are defined. Here's a rundown of the "supporting"
stylesheets, that are unlikely to be the right place for a drive by stylesheet
fix:
_colors.scss - global color definitions. We keep the number of defined
colors to a necessary minimum, most colors are derived
from a handful of basics. It covers both the light variant
and the dark variant.
_colors-public.scss - SCSS colors exported through gtk to allow for 3rd party
apps color mixing.
_drawing.scss - drawing helper mixings/functions to allow easier
definition of widget drawing under specific context. This
is why Adwaita isn't 15000 LOC.
_common.scss - actual definitions of style for each widget. This is
where you are likely to add/remove your changes.
You can read about SASS at http://sass-lang.com/documentation/. Once you make
your changes to the _common.scss file, GTK will rebuild the CSS files.