Adds a palette to the color chooser. If @orientation is horizontal,
the colors are grouped in rows, with @colors_per_line colors
in each row. If @horizontal is %FALSE, the colors are grouped
in columns instead.
The default color palette of #GtkColorChooserWidget has
27 colors, organized in columns of 3 colors. The default gray
palette has 9 grays in a single row.
The layout of the color chooser widget works best when the
palettes have 9-10 columns.
Calling this function for the first time has the
side effect of removing the default color and gray palettes
from the color chooser.
If @colors is %NULL, removes all previously added palettes.
Adds a palette to the color chooser. If @orientation is horizontal, the colors are grouped in rows, with @colors_per_line colors in each row. If @horizontal is %FALSE, the colors are grouped in columns instead.
The default color palette of #GtkColorChooserWidget has 27 colors, organized in columns of 3 colors. The default gray palette has 9 grays in a single row.
The layout of the color chooser widget works best when the palettes have 9-10 columns.
Calling this function for the first time has the side effect of removing the default color and gray palettes from the color chooser.
If @colors is %NULL, removes all previously added palettes.