complete jump keyframeEnter keyframeLeave response seek step update

keyframeEnter detail::event::keyframeEnter_t keyframeEnter {} inlineconstexpr Event triggered when entering a new keyframe segment. Fires when the tween transitions into a new keyframe section during playback. The callback receives both the tween reference and a keyframeEnter struct containing the keyframe index. Common use cases: Triggering phase-specific animations Playing transition sounds Updating UI to reflect animation phase Synchronizing multi-part animations Implementing animation state machines Note Keyframe indices are 0-based. The first keyframe is index 0, second is 1, etc. auto tween = tweeny::from(0) .to(50).during(30U) .to(100).during(30U) .build(); tween.on(tweeny::event::keyframeEnter, [](auto& t, tweeny::event::keyframeEnter evt) { printf("Entering keyframe %zu\n", evt.key_frame); return tweeny::event::response::ok; }); tween.step(31); // Triggers: "Entering keyframe 1" See also keyframeLeave For detecting when leaving a keyframe keyframeEnter For the event data struct jump For manually jumping to keyframes