Basic introduction, tutorials, tips & tricks.
An “event” is some kind of function being called (or triggered) by some action.
For example, clicking your mouse is an action that would cause an event. If there is no function (or handler) registered for the mouse event, nothing will happen. So, how would you do something when a mouse is clicked?
From the loop_hook manual page, we know that mlx_mouse_hook can be used to register an event handler for the mouse, and we know how the event handler will be called.
int mouse_event(int button, int x, int y, void *param)
{
// Whenever the event is triggered, print the value of button to console.
ft_putnbr(button);
}
It’s important to note that your event handlers should be registered before mlx_hook because that function will never return. (It is an infinite loop that just waits for events and calls the event handler if there is one.) You can register new handlers and replace old ones after mlx_loop has started, as long as you have at least one handler active so your program can respond to actions.
int main()
{
void *mlx = mlx_init();
void *win = mlx_new_window(mlx, 640, 360, "Tutorial Window - Registering Events");
mlx_mouse_hook(win, &mouse_event, 0);
mlx_loop(mlx);
}