gobject:object, common-lisp:standard-object, common-lisp:t

gtk:constraint-layout-child, gtk:fixed-layout-child, gtk:grid-layout-child, gtk:overlay-layout-child

The gtk:layout-child class is the base class for objects that are meant to hold layout properties. If a gtk:layout-manager object has per-child properties, like their packing type, or the horizontal and vertical span, or the icon name, then the layout manager should use a gtk:layout-child implementation to store those properties.

A gtk:layout-child instance is only ever valid while a widget is part of a layout.