alias Gtk::TreeIterCompareFunc


A Gtk::TreeIterCompareFunc should return a negative integer, zero, or a positive integer if a sorts before b, a sorts with b, or a sorts after b respectively.

If two iters compare as equal, their order in the sorted model is undefined. In order to ensure that the Gtk::TreeSortable behaves as expected, the Gtk::TreeIterCompareFunc must define a partial order on the model, i.e. it must be reflexive, antisymmetric and transitive.

For example, if model is a product catalogue, then a compare function for the “price” column could be one which returns price_of(@a) - price_of(@b).

Alias Definition

Gtk::TreeModel, Gtk::TreeIter, Gtk::TreeIter -> Int32

Defined in: