procedure Destroy (Data : in out User_Data_Type)
type Gtk_Tree_Iter_Compare_Func is access function
(Model : Gtk.Tree_Model.Gtk_Tree_Model;
A : Gtk.Tree_Model.Gtk_Tree_Iter;
B : Gtk.Tree_Model.Gtk_Tree_Iter;
User_Data : User_Data_Type) return Glib.Gint;
A GtkTreeIterCompareFunc 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.Tree_Sortable.Gtk_Tree_Sortable behaves as expected, the GtkTreeIterCompareFunc 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).
The Gtk.Tree_Model.Gtk_Tree_Model the comparison is within
A Gtk.Tree_Model.Gtk_Tree_Iter in Model
Another Gtk.Tree_Model.Gtk_Tree_Iter in Model
Data passed when the compare func is assigned e.g. by Gtk.Tree_Sortable.Set_Sort_Func
a negative integer, zero or a positive integer depending on whether A sorts before, with or after B
procedure Set_Sort_Func
(Sortable : Gtk.Tree_Sortable.Gtk_Tree_Sortable;
Sort_Column_Id : Glib.Gint;
Sort_Func : Gtk_Tree_Iter_Compare_Func;
User_Data : User_Data_Type)
Sets the comparison function used when sorting to be Sort_Func. If the current sort column id of Sortable is the same as Sort_Column_Id, then the model will sort using this function.
the sort column id to set the function for
The comparison function
User data to pass to Sort_Func, or null
type User_Data_Type (<>) is private;