<ThreadSafetyStatement>Gtk# is thread aware, but not thread safe; See the <linklocation="node:gtk-sharp/programming/threads">Gtk# Thread Programming</link> for details.</ThreadSafetyStatement>
<para>Rulers are used to show the location of the mouse in the window and to display the size of the window in the specified units. The available units of measurement are <seecref="P:Gtk.MetricType.Pixels"/>, <seecref="P:Gtk.MetricType.Inches"/> and <seecref="P:Gtk.MetricType.Centimeters"/>. The default is <seecref="P:Gtk.MetricType.Pixels"/>.</para>
<para>A horizontal ruler is typically used above or below another widget such as a <seecref="T:Gtk.DrawingArea"/>.</para>
<para>Note:- This widget is considered too specialized for GTK+, and will likely be moved to some other package in the future.</para>
<returns>Creates a new instance of HRuler, using the GLib-provided type</returns>
<remarks>
<para>This is a constructor used by derivative types of <seecref="T:Gtk.HRuler"/> that would have their own GLib type assigned to it. This is not typically used by C# code.</para>