void button_press(int, int, unsigned);
void button_release(int, int, unsigned);
void pointer_motion(int, int);
void view_all();
void set_block_color(const Marklin::Block &, const Marklin::Color &);
void button_press(int, int, unsigned);
void button_release(int, int, unsigned);
void pointer_motion(int, int);
void view_all();
void set_block_color(const Marklin::Block &, const Marklin::Color &);