Description GtkBox is an abstract widget which encapsulates functionality for a particular kind of container, one that organizes a variable number of widgets into a rectangular area. GtkBox has a number of derived classes, e.g. GtkHBox and GtkVBox. The rectangular area of a GtkBox is organized into either a single row or a single column of child widgets depending upon whether the box is of type GtkHBox or GtkVBox, respectively. Thus, all children of a GtkBox are allocated one dimension in common, which is the height of a row, or the width of a column. GtkBox uses a notion of packing. Packing refers to adding widgets with reference to a particular position in a GtkContainer. For a GtkBox, there are two reference positions: the start and the end of the box. For a GtkVBox, the start is defined as the top of the box and the end is defined as the bottom. For a GtkHBox the start is defined as the left side and the end is defined as the right side. Use repeated calls to gtk_box_pack_start() to pack widgets into a GtkBox from start to end. Use gtk_box_pack_end() to add widgets from end to start. You may intersperse these calls and add widgets from both ends of the same GtkBox. Use gtk_box_pack_start_defaults() or gtk_box_pack_end_defaults() to pack widgets into a GtkBox if you do not need to specify the "expand", "fill", or "padding" child properties for the child to be added. Because GtkBox is a GtkContainer, you may also use gtk_container_add() to insert widgets into the box, and they will be packed as if with gtk_box_pack_start_defaults(). Use gtk_container_remove() to remove widgets from the GtkBox. Use gtk_box_set_homogeneous() to specify whether or not all children of the GtkBox are forced to get the same amount of space. Use gtk_box_set_spacing() to determine how much space will be minimally placed between all children in the GtkBox. Use gtk_box_reorder_child() to move a GtkBox child to a different place in the box. Use gtk_box_set_child_packing() to reset the "expand", "fill" and "padding" child properties. Use gtk_box_query_child_packing() to query these fields.