void gtk_constraint_layout_add_constraint ( GtkConstraintLayout* layout, GtkConstraint* constraint )
Adds a constraint to the layout manager.
constraint can be:
- set to
NULLto indicate that the constraint refers to the widget using
- set to the
- set to a child of the
- set to a
GtkConstraintGuidethat is part of
layout acquires the ownership of
constraint after calling
The instance takes ownership of the data, and is responsible for freeing it.