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

None

The gtk:constraint class describes a constraint between an attribute on a widget and another attribute on another widget, expressed as a linear equation.

The typical equation for a constraint is:

target.target_attr = source.source_attr × multiplier + constant  

Each gtk:constraint object is part of a system that will be solved by a gtk:constraint-layout object in order to allocate and position each child widget.

The source and target widgets, as well as their attributes, of a gtk:constraint object are immutable after creation.