Creates an expression that looks up a property via the given expression or the this argument when expression is NULL.
If the resulting object conforms to this_type, its property specified by pspec will be queried. Otherwise, this expression's evaluation will fail.
Expression to evaluate to get the object to query or NULL to query the this object
the GParamSpec for the property to query
a new GtkExpression
ConstructionException GTK+ fails to create the object.
See Implementation
Creates an expression that looks up a property via the given expression or the this argument when expression is NULL.
If the resulting object conforms to this_type, its property specified by pspec will be queried. Otherwise, this expression's evaluation will fail.