MapListModel

MapListModel is a list model that takes a list model and maps the items in that model to different items according to a MapListModelMapFunc.

Example: Create a list of EventControllers

  static gpointer
  map_to_controllers (gpointer widget,
                      gpointer data)
 {
    gpointer result = gtk_widget_observe_controllers (widget);
    g_object_unref (widget);
    return result;
 }

  widgets = gtk_widget_observe_children (widget);

  controllers = gtk_map_list_model_new (G_TYPE_LIST_MODEL,
                                        widgets,
                                        map_to_controllers,
                                        NULL, NULL);

  model = gtk_flatten_list_model_new (GTK_TYPE_EVENT_CONTROLLER,
                                      controllers);

MapListModel will attempt to discard the mapped objects as soon as they are no longer needed and recreate them if necessary.