sub start_timer {
        # set or update timer events
        my $win = Kephra::App::Window::_ref();
        my $config = Kephra::API::settings()->{file};   

        stop_timer();
        if ($config->{open}{notify_change}) {
                $timer{file_notify} = Wx::Timer->new( $win, 2 );
                $timer{file_notify}->Start( $config->{open}{notify_change} * 1000 );
                Wx::Event::EVT_TIMER( $win, 2, sub { Kephra::File::changed_notify_check() } );
        }
        if ($config->{save}{auto_save}) {
                $timer{file_save} = Wx::Timer->new( $win, 1 );
                $timer{file_save}->Start( $config->{save}{auto_save} * 1000 );
                Wx::Event::EVT_TIMER( $win, 1, sub { Kephra::File::save_all_named() } );
        }
}