This file is indexed.

/usr/share/gtk-3.0/demo/entry_completion.c is in gtk-3-examples 3.4.2-0ubuntu0.9.

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The actual contents of the file can be viewed below.

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/* Entry/Entry Completion
 *
 * GtkEntryCompletion provides a mechanism for adding support for
 * completion in GtkEntry.
 *
 */

#include <gtk/gtk.h>

static GtkWidget *window = NULL;

/* Creates a tree model containing the completions */
GtkTreeModel *
create_completion_model (void)
{
  GtkListStore *store;
  GtkTreeIter iter;

  store = gtk_list_store_new (1, G_TYPE_STRING);

  /* Append one word */
  gtk_list_store_append (store, &iter);
  gtk_list_store_set (store, &iter, 0, "GNOME", -1);

  /* Append another word */
  gtk_list_store_append (store, &iter);
  gtk_list_store_set (store, &iter, 0, "total", -1);

  /* And another word */
  gtk_list_store_append (store, &iter);
  gtk_list_store_set (store, &iter, 0, "totally", -1);

  return GTK_TREE_MODEL (store);
}


GtkWidget *
do_entry_completion (GtkWidget *do_widget)
{
  GtkWidget *content_area;
  GtkWidget *vbox;
  GtkWidget *label;
  GtkWidget *entry;
  GtkEntryCompletion *completion;
  GtkTreeModel *completion_model;

  if (!window)
    {
      window = gtk_dialog_new_with_buttons ("GtkEntryCompletion",
                                            GTK_WINDOW (do_widget),
                                            0,
                                            GTK_STOCK_CLOSE,
                                            GTK_RESPONSE_NONE,
                                            NULL);
      gtk_window_set_resizable (GTK_WINDOW (window), FALSE);

      g_signal_connect (window, "response",
                        G_CALLBACK (gtk_widget_destroy), NULL);
      g_signal_connect (window, "destroy",
                        G_CALLBACK (gtk_widget_destroyed), &window);

      content_area = gtk_dialog_get_content_area (GTK_DIALOG (window));

      vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 5);
      gtk_box_pack_start (GTK_BOX (content_area), vbox, TRUE, TRUE, 0);
      gtk_container_set_border_width (GTK_CONTAINER (vbox), 5);

      label = gtk_label_new (NULL);
      gtk_label_set_markup (GTK_LABEL (label), "Completion demo, try writing <b>total</b> or <b>gnome</b> for example.");
      gtk_box_pack_start (GTK_BOX (vbox), label, FALSE, FALSE, 0);

      /* Create our entry */
      entry = gtk_entry_new ();
      gtk_box_pack_start (GTK_BOX (vbox), entry, FALSE, FALSE, 0);

      /* Create the completion object */
      completion = gtk_entry_completion_new ();

      /* Assign the completion to the entry */
      gtk_entry_set_completion (GTK_ENTRY (entry), completion);
      g_object_unref (completion);

      /* Create a tree model and use it as the completion model */
      completion_model = create_completion_model ();
      gtk_entry_completion_set_model (completion, completion_model);
      g_object_unref (completion_model);

      /* Use model column 0 as the text column */
      gtk_entry_completion_set_text_column (completion, 0);
    }

  if (!gtk_widget_get_visible (window))
    gtk_widget_show_all (window);
  else
    gtk_widget_destroy (window);

  return window;
}