[goffice] GOColorPalette: allow querying the default colours.

[Morten Welinder <mortenw src gnome org>]

commit c12bb8f6548e9a0e387082661c84c81de7ac0422
Author: Morten Welinder <terra gnome org>
Date:   Mon Apr 9 19:58:25 2018 -0400

    GOColorPalette: allow querying the default colours.

 goffice/gtk/go-color-palette.c |   14 ++++++++++++++
 goffice/gtk/go-color-palette.h |    3 +++
 2 files changed, 17 insertions(+), 0 deletions(-)
---
diff --git a/goffice/gtk/go-color-palette.c b/goffice/gtk/go-color-palette.c
index e8e1a1b..4549ab8 100644
--- a/goffice/gtk/go-color-palette.c
+++ b/goffice/gtk/go-color-palette.c
@@ -144,6 +144,20 @@ static GONamedColor const default_color_set [] = {
 
        { 0, NULL},
 };
+
+gboolean
+go_color_palette_query (int n, GONamedColor *color)
+{
+       if (n < 0 || n >= (int)G_N_ELEMENTS (default_color_set) - 1)
+               return FALSE;
+
+       color->name = _(default_color_set[n].name);
+       color->color = default_color_set[n].color;
+       return TRUE;
+}
+
+
+
 const GONamedColor *
 _go_color_palette_default_color_set (void)
 {
diff --git a/goffice/gtk/go-color-palette.h b/goffice/gtk/go-color-palette.h
index f5804a1..6a584e2 100644
--- a/goffice/gtk/go-color-palette.h
+++ b/goffice/gtk/go-color-palette.h
@@ -60,6 +60,9 @@ GOColor go_color_palette_get_current_color    (GOColorPalette *p,
                                                 gboolean *is_default, gboolean *is_custom);
 void   go_color_palette_set_allow_alpha        (GOColorPalette *p, gboolean allow_alpha);
 
+/* static */
+gboolean go_color_palette_query (int n, GONamedColor *color);
+
 /* private */
 const GONamedColor *_go_color_palette_default_color_set (void);