public interface Orientable : Object
The Orientable 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 Box /HBox/VBox or Scale/HScale/ VScale). Orientable is more flexible in that it allows the orientation to be changed at runtime, allowing the widgets to “flip”.
Orientable was introduced in GTK+ 2.16.