File chooser API for formats in Save mode

[Federico Mena Quintero <federico ximian com>]

Hi,

Seth's new design for the file chooser calls for a combo box that
displays available formats for saving:

	http://www.gnome.org/~seth/filechooser-spec/

We need an API for that.  My proposed API is this:

void gtk_file_chooser_add_save_format (GtkFileChooser *chooser,
				       gint            id,
				       const gchar    *name,
				       GdkPixbuf      *small_icon,
				       GdkPixbuf      *large_icon);

void gtk_file_chooser_remove_save_format (GtkFileChooser *chooser,
					  gint            id);

void gtk_file_chooser_set_save_format (GtkFileChooser *chooser,
				       gint            id);

gint gtk_file_chooser_get_save_format (GtkFileChooser *chooser);

The idea is to do something like this:

chooser = gtk_file_chooser_dialog_new ("Save As", 
				       parent_window,
				       GTK_FILE_CHOOSER_ACTION_SAVE,
				       GTK_STOCK_SAVE, GTK_RESPONSE_ACCEPT,
				       GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL);

gtk_file_chooser_add_save_format (chooser, 0, "Excel 2000", ...);
gtk_file_chooser_add_save_format (chooser, 1, "Gnumeric", ...);
gtk_file_chooser_add_save_format (chooser, 2, "Lotus 1-2-3", ...);

gtk_file_chooser_set_save_format (chooser, 1); /* Make Gnumeric the default */

if (gtk_dialog_run (chooser) == GTK_RESPONSE_ACCEPT)
  {
    guint format;
    char *filename;

    format = gtk_file_chooser_get_save_format (chooser);
    filename = gtk_file_chooser_get_filename (chooser);
    save_file (filename, format);
  }

The file chooser would show the large_icon as the selected item in the
combo, and the small_icons in the actual popup menu.

What do people think of this API?  [Owen, you had more ideas during
today's meeting...]

  Federico