the target of the constraint
the attribute of target to be set
the relation equivalence between target_attribute and source_attribute
the source of the constraint
the attribute of source to be read
a multiplication factor to be applied to source_attribute
a constant factor to be added to source_attribute
the strength of the constraint
the newly created constraint
ConstructionException GTK+ fails to create the object.
Creates a new constraint representing a relation between a layout attribute on a source and a layout attribute on a target.