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import type { SceneTracks } from "@/timeline";
import {
buildTimelineSnapPoints,
getTimelineSnapThresholdInTicks,
resolveTimelineSnap,
type SnapPoint,
} from "@/timeline/snapping";
import { getElementEdgeSnapPoints } from "@/timeline/element-snap-source";
import { getPlayheadSnapPoints } from "@/timeline/playhead-snap-source";
import { getAnimationKeyframeSnapPointsForTimeline } from "@/timeline/animation-snap-points";
import type { MoveGroup } from "./types";
export function snapGroupEdges({
group,
anchorStartTime,
tracks,
playheadTime,
zoomLevel,
}: {
group: MoveGroup;
anchorStartTime: number;
tracks: SceneTracks;
playheadTime: number;
zoomLevel: number;
}): {
snappedAnchorStartTime: number;
snapPoint: SnapPoint | null;
} {
const excludeElementIds = new Set(
group.members.map((member) => member.elementId),
);
const snapPoints = buildTimelineSnapPoints({
sources: [
() => getElementEdgeSnapPoints({ tracks, excludeElementIds }),
() => getPlayheadSnapPoints({ playheadTime }),
() =>
getAnimationKeyframeSnapPointsForTimeline({
tracks,
excludeElementIds,
}),
],
});
const maxSnapDistance = getTimelineSnapThresholdInTicks({ zoomLevel });
let closestSnapDistance = Infinity;
let snappedAnchorStartTime = anchorStartTime;
let snapPoint: SnapPoint | null = null;
for (const member of group.members) {
const memberStartTime = anchorStartTime + member.timeOffset;
const memberStartSnap = resolveTimelineSnap({
targetTime: memberStartTime,
snapPoints,
maxSnapDistance,
});
if (
memberStartSnap.snapPoint &&
memberStartSnap.snapDistance < closestSnapDistance
) {
closestSnapDistance = memberStartSnap.snapDistance;
snappedAnchorStartTime = memberStartSnap.snappedTime - member.timeOffset;
snapPoint = memberStartSnap.snapPoint;
}
const memberEndSnap = resolveTimelineSnap({
targetTime: memberStartTime + member.duration,
snapPoints,
maxSnapDistance,
});
if (
memberEndSnap.snapPoint &&
memberEndSnap.snapDistance < closestSnapDistance
) {
closestSnapDistance = memberEndSnap.snapDistance;
snappedAnchorStartTime =
memberEndSnap.snappedTime - member.duration - member.timeOffset;
snapPoint = memberEndSnap.snapPoint;
}
}
return {
snappedAnchorStartTime,
snapPoint,
};
}
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