GtkSubmenuDirection is deprecated and should not be used in newly-written code.
Indicates the direction a sub-menu will appear.
Value | Symbolic name | Description |
| 1 | Gtk::DIRECTION_LEFT | A sub-menu will appear at the left side of the parent menu. |
| 2 | Gtk::DIRECTION_RIGHT | A sub-menu will appear at the right side of the parent menu. |