void (*click)(struct wt_widget *w);
void (*keypress)(struct wt_widget *w, int key);
void (*mbutton)(struct wt_widget *w, int bn, int st, int x, int y);
void (*mmotion)(struct wt_widget *w, int x, int y);
void (*click)(struct wt_widget *w);
void (*keypress)(struct wt_widget *w, int key);
void (*mbutton)(struct wt_widget *w, int bn, int st, int x, int y);
void (*mmotion)(struct wt_widget *w, int x, int y);