Added Combobox/Listbox.Len() and its GTK+ implementation.

1 files changed, 12 insertions, 0 deletions

diff --git a/listbox_unix.go b/listbox_unix.go
index 10f2680..cc6ca44 100644
--- a/listbox_unix.go
+++ b/listbox_unix.go
@@ -211,3 +211,15 @@ func gListboxDelete(widget *gtkWidget, index int) {
 	}
 	C.gtk_list_store_remove(ls, &iter)
 }
+
+// this is a separate function because Combobox uses it too
+func gtkTreeModelListLen(model *C.GtkTreeModel) int {
+	// "As a special case, if iter is NULL, then the number of toplevel nodes is returned."
+	return int(C.gtk_tree_model_iter_n_children(model, (*C.GtkTreeIter)(nil)))
+}
+
+func gListboxLen(widget *gtkWidget) int {
+	tv := getTreeViewFrom(widget)
+	model := C.gtk_tree_view_get_model(tv)
+	return gtkTreeModelListLen(model)
+}