The reason behind ubuntu's Ambiance GTK3 theme incorporating CSS in its settings.ini file

Exploring the functionality of theming in GTK3 using CSS, I decided to experiment with my default theme in Ubuntu 13.04, known as Ambiance. The source for this theme can be found at 

/usr/share/themes/Ambiance/gtk-3.0/
.

Interestingly, when attempting to modify a color within the gtk-main.css file in this directory (within a @define-color statement), I discovered that the change did not take effect even after restarting the computer.

Upon further investigation, I came across a settings.ini file (located in the same folder) with the following contents:

[Settings]
gtk-color-scheme = "base_color:#ffffff\nbg_color:#f2f1f0\ntooltip_bg_color:#000000\nselected_bg_color:#ffffff\ntext_color:#3C3C3C\nfg_color:#4c4c4c\ntooltip_fg_color:#ffffff\nselected_fg_color:#ffffff\nlink_color:#DD4814\nbg_color_dark:#3c3b37\nfg_color_dark:#dfdbd2"
gtk-auto-mnemonics = 1

Surprisingly, it appears that the content of gtk-main.css is actually embedded within the settings.ini file under the variable gtk-color-scheme. Modifying this variable indeed results in a change to the color scheme in my current Gtk theme.

This raises some questions:

  • Why the redundancy? (Perhaps removing the gtk-main.css file would have prevented confusion.)
  • Is this specific to Ubuntu or a universal practice? If so, where is it documented? I couldn't find any information about this on the Gnome website.
  • What is the purpose behind this setup?
cssubuntuthemesgtk3

Answer №1

It seems that this method allows you to supersede @define-color regulations, as detailed on this page, and further elaborated on here.

Answer №2

To make it brief and clear: You will need to modify the theme.

Is there a way to return to the original settings after making changes?

Unfortunately not, but if you make changes in the .ini file, you can revert back to the values in the .css file using that same .css file.

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