Migrating from GnomeColorPicker to GtkColorButton
Since version 2.6, GTK+ provides the #GtkColorButton
widget as a replacement for the GnomeColorPicker
widget in the libgnomeui library.
Porting an application from GnomeColorPicker to
GtkColorButton is very simple.
GtkColorButton doesn't support dithering
(since it is rarely needed on modern hardware), and it doesn't have
setters and getters to set the color from floating point or integer
components. So instead of
guint red, green, blue, alpha;
/* ... */
gnome_color_picker_set_i8 (color_picker, red, green, blue, alpha);
you have to write
GdkColor color;
color.red = red << 8;
color.green = green << 8;
color.blue = blue << 8;
gtk_color_button_set_color (color_picker, &color);
gtk_color_button_set_alpha (color_picker, alpha << 8);
and similarly for the setters taking other number formats. For
gnome_color_picker_set_i16() no conversion is needed,
for gnome_color_picker_set_d(), you need to convert
the color components like this:
color.red = (guint16) (red * 65535.0 + 0.5);
color.green = (guint16) (green * 65535.0 + 0.5);
color.blue = (guint16) (blue * 65535.0 + 0.5);