A function to be called to transform @from_value to @to_value. If
this is the @transform_to function of a binding, then @from_value
is the @source_property on the @source object, and @to_value is the
@target_property on the @target object. If this is the
@transform_from function of a %G_BINDING_BIDIRECTIONAL binding,
then those roles are reversed.
A function to be called to transform @from_value to @to_value. If this is the @transform_to function of a binding, then @from_value is the @source_property on the @source object, and @to_value is the @target_property on the @target object. If this is the @transform_from function of a %G_BINDING_BIDIRECTIONAL binding, then those roles are reversed.