void grab_button_full(guint button, guint state, Window win, guint mask,
gint pointer_mode, ObCursor cursor);
void ungrab_button(guint button, guint state, Window win);
void grab_button_full(guint button, guint state, Window win, guint mask,
gint pointer_mode, ObCursor cursor);
void ungrab_button(guint button, guint state, Window win);