backward direction duration during forward from jump onSeek onSeek onSeek onStep onStep onStep peek peek peek point progress seek seek seek step step step to tween via via

onStep() [2/3] tween<T, Ts...>& onStep ( typename detail::tweentraits< T, Ts... >::noValuesCallbackType  callback ) Adds a callback that will be called when stepping occurs, accepting only the tween. You can add as many callbacks as you want. It must receive the tween as an argument. Callbacks can be of any callable type. It will only be called via tween::step() functions. For seek callbacks, see tween::onSeek(). Keep in mind that the function will be copied into an array, so any variable captured by value will also be copied with it. If the callback returns false, it will be called next time. If it returns true, it will be removed from the callback queue. Example: auto t = tweeny:from(0).to(100).during(100); // pass a lambda t.onStep([](tweeny::tween<int> & t) { printf("%d ", t.value()); return false; }); // pass a functor instance struct ftor { void operator()(tweeny::tween<int> & t) { printf("%d ", t.values()); return false; } }; t.onStep(ftor()); See also step seek onSeek Parameters callback A callback in the form bool f(tween<Ts...> & t)