gtkOrientableGetOrientation(object)
gtkOrientableSetOrientation(object, orientation)GInterface +----GtkOrientable
GtkBox, GtkButtonBox, GtkColorSelection, GtkCombo, GtkFileChooserButton, GtkFileChooserWidget, GtkFontSelection, GtkGammaCurve, GtkHBox, GtkHButtonBox, GtkHPaned, GtkHRuler, GtkHScale, GtkHScrollbar, GtkHSeparator, GtkInfoBar, GtkPaned, GtkRange, GtkRecentChooserWidget, GtkRuler, GtkScale, GtkScaleButton, GtkScrollbar, GtkSeparator, GtkStatusbar, GtkToolPalette, GtkToolbar, GtkVBox, GtkVButtonBox, GtkVPaned, GtkVRuler, GtkVScale, GtkVScrollbar, GtkVSeparator and GtkVolumeButton.GtkOrientable interface is implemented by all widgets that can be
oriented horizontally or vertically. Historically, such widgets have been
realized as subclasses of a common base class (e.g GtkBox/GtkHBox/GtkVBox
and GtkScale/GtkHScale/GtkVScale). GtkOrientable is more flexible in that
it allows the orientation to be changed at runtime, allowing the widgets
to 'flip'. GtkOrientable was introduced in GTK+ 2.16.