A horizontal ruler.
This widget is considered too specialized/little-used
for GTK+, and will in the future be moved to some other package. If your application needs
this widget, feel free to use it, as the widget does work and is useful in some applications;
it's just not of general interest. However, we are not accepting new features for the widget,
and it will eventually move out of the GTK+ distribution.
The HRuler widget is a widget arranged horizontally creating a ruler that
is utilized around other widgets such as a text widget. The ruler is used
to show the location of the mouse on the window and to show the size of
the window in specified units. The available units of measurement are
Gtk::PIXELS is the default.
Creates a new horizontal ruler.