HBox is a container that organizes child widgets into a single row.

Use the Box packing interface to determine the arrangement, spacing, width, and alignment of HBox children.

All children are allocated the same height.

GtkHBox has been deprecated. You can use Box instead, which is a very quick and easy change. If you have derived your own classes from GtkHBox, you can simply change the inheritance to derive directly from Box. No further changes are needed, since the default value of the Orientable:orientation property is OrientationHorizontal. If you don’t need first-child or last-child styling, and want your code to be future-proof, the recommendation is to switch to Grid instead of nested boxes. For more information about migrating to Grid, see [Migrating from other containers to GtkGrid][gtk-migrating-GtkGrid].