void wt_layout(wt_widget *w, int layout);
void wt_padding(wt_widget *w, int pad);
/* calculates layout of child widgets and updates dimensions */
void wt_relayout(wt_widget *w);
void wt_layout(wt_widget *w, int layout);
void wt_padding(wt_widget *w, int pad);
/* calculates layout of child widgets and updates dimensions */
void wt_relayout(wt_widget *w);