bool CoverWidget::on_slideshowScroll(GdkEventScroll * s) {

    if (s->direction == GDK_SCROLL_DOWN) {
      on_next();
    } else if (s->direction == GDK_SCROLL_UP) {
      on_prev();
    }
  }
static gboolean on_key(GtkWidget *widget, GdkEventKey *event, Editor *e)
{
    switch(event->keyval)
    {
        case GDK_Up:
            on_prev(NULL, e);
            return TRUE;
        case GDK_Down: case GDK_Return:
            on_next(NULL, e);
            return TRUE;            
    }
    return FALSE;
}