flag indicates whether extra space should be given to this child. Any extra space given to the parent GtkBox is divided up among all children with this attribute set to %TRUE; set when packed, %TRUE by default.
flag indicates whether any extra space given to this child due to its
expand attribute being set is actually allocated to the child, rather than
being used as padding around the widget; set when packed, %TRUE by default.
%TRUE if the child is secondary
one of #GtkPackType indicating whether the child is packed with reference to the start (top/left) or end (bottom/right) of the GtkBox.
the number of extra pixels to put between this child and its neighbors, set when packed, zero by default.
the child widget, packed into the GtkBox.
The #GtkBoxChild holds a child widget of #GtkBox and describes how the child is to be packed into the #GtkBox. All fields of this #GtkBoxChild should be considered read-only and they should never be set directly by an application. Use gtk_box_query_child_packing() and gtk_box_set_child_packing() to query and set the #GtkBoxChild.padding, #GtkBoxChild.expand, #GtkBoxChild.fill and #GtkBoxChild.pack fields.