apps/web/src/animation/timeline-snap-points.ts


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import { getElementKeyframes } from "@/animation";
import type { SceneTracks } from "@/timeline";
import type { SnapPoint } from "@/timeline/snapping";

export function getAnimationKeyframeSnapPointsForTimeline({
	tracks,
	excludeElementIds,
}: {
	tracks: SceneTracks;
	excludeElementIds?: Set<string>;
}): SnapPoint[] {
	const snapPoints: SnapPoint[] = [];
	const orderedTracks = [...tracks.overlay, tracks.main, ...tracks.audio];

	for (const track of orderedTracks) {
		for (const element of track.elements) {
			if (excludeElementIds?.has(element.id)) {
				continue;
			}

			for (const keyframe of getElementKeyframes({
				animations: element.animations,
			})) {
				snapPoints.push({
					time: element.startTime + keyframe.time,
					type: "keyframe",
					elementId: element.id,
					trackId: track.id,
				});
			}
		}
	}

	return snapPoints;
}