- bool button_press(int, int, unsigned);
- bool button_release(int, int, unsigned);
- bool pointer_motion(int, int);
+ virtual void button_press(int, int, unsigned) { }
+ virtual void button_release(int, int, unsigned) { }
+ virtual void pointer_motion(int, int) { }
+ virtual void pointer_enter() { }
+ virtual void pointer_leave() { }
+ virtual void key_press(unsigned, unsigned, wchar_t) { }
+ virtual void key_release(unsigned, unsigned) { }
+ virtual void focus_in() { }
+ virtual void focus_out() { }