Re: Themes and colours

[muppet <scott asofyet org>]

On Oct 15, 2006, at 8:03 PM, Daniel Kasak wrote:

> I've been reading a bit on Gtk2::Widget->get_default_style and
> Gtk2::Style, but I'm not sure if I can do what I want to do. Here's
> what I want to do ...
>
> - find out what default colour a cell's text will be, according to the
> current Gtk2 theme ( most important )
>
> - find out what colour a cell's text will be when the row is selected
> ( helps me to decide what text colours might be appropriate )
>
> - find out what colours a cell's background alternates between when
> 'rules hinting' is on ( less important )
>
> Is this stuff possible?

You can read the gtk+ source and find the answers, but they're  
probably not guaranteed.

In general:

- the text color will come from the TreeView's style's "text" color;  
the state is determined by mapping the cell renderer's state into the  
GtkWidgetState enumeration values.

- the background color is from the TreeView's style's "base" color.   
again, the state is determined by mapping the renderer's state.   
"selected" is most important here.

- the treeview sets up the "cell_odd_ruled" etc detail for GtkStyle  
when drawing a ruled view.  the default implementation uses a custom  
function to "darken" the base color (using a trivial scaling of  
luminance and saturation in the HLS colorspace) by some initially non- 
obvious rules.  the upshot is that i think this is entirely theme- 
dependent, and there appears to be no way to query it.  if you  
*really* need the color, you may have to resort to screen-scraping.

--
"Ghostbusters" is the best movie of this decade.
  -- Neal, circa 1996, referring to a movie released in 1984.