Added valid predicates to transpose and sort dialogs.

[pspp-builds.git] / src / ui / gui / sort-cases-dialog.c

diff --git a/src/ui/gui/sort-cases-dialog.c b/src/ui/gui/sort-cases-dialog.c
index a722063bca70beb42f7ca4a4a990926fa369b4b1..62fac58379b7aaf71f0de9fed8672c98ee3ed74a 100644 (file)
--- a/src/ui/gui/sort-cases-dialog.c
+++ b/src/ui/gui/sort-cases-dialog.c
@@ -45,6 +45,21 @@ struct sort_cases_dialog
   GtkToggleButton *ascending;
 };
 
+
+static gboolean
+dialog_state_valid (gpointer data)
+{
+  struct sort_cases_dialog *scd = data;
+  GtkTreeModel *model = gtk_tree_view_get_model (scd->tv);
+
+  gint n_rows = gtk_tree_model_iter_n_children  (model, NULL);
+
+  if ( n_rows == 0 )
+    return FALSE;
+
+  return TRUE;
+}
+
 static char *
 generate_syntax (const struct sort_cases_dialog *scd)
 {
@@ -117,6 +132,11 @@ sort_cases_dialog (GObject *o, gpointer data)
   scd.ascending =
     GTK_TOGGLE_BUTTON (get_widget_assert (xml, "sort-cases-radiobutton0"));
 
+
+  psppire_dialog_set_valid_predicate (PSPPIRE_DIALOG (dialog),
+                                     dialog_state_valid, &scd);
+
+
   response = psppire_dialog_run (PSPPIRE_DIALOG (dialog));