Update all the graphs that are being displayed

def update_displayed_information(self):
        """ Update all the graphs that are being displayed """

        for source in self.controller.sources:
            source_name = source.get_source_name()
            if (any(self.graphs_menu.active_sensors[source_name]) or
                    any(self.summary_menu.active_sensors[source_name])):
                source.update()

        for graph in self.visible_graphs.values():
            graph.update()

        # update graph summery
        for summary in self.visible_summaries.values():
            summary.update()

        # Only update clock if not is stress mode
        if self.controller.stress_conroller.get_current_mode() != 'Monitor':
            self.clock_view.set_text(seconds_to_text(
                (timeit.default_timer() - self.controller.stress_start_time)))