void set_focused_window(Window *win);
const Window *get_focused_window() const;
Window *get_focused_window();
Window *get_window_at_pos(int pointer_x, int pointer_y);
void set_focused_window(Window *win);
const Window *get_focused_window() const;
Window *get_focused_window();
Window *get_window_at_pos(int pointer_x, int pointer_y);