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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 "@/animation/timeline-snap-points";
import type { MoveGroup } from "./types";
import { addMediaTime, type MediaTime, subMediaTime } from "@/wasm";
export function snapGroupEdges({
group,
anchorStartTime,
tracks,
playheadTime,
zoomLevel,
}: {
group: MoveGroup;
anchorStartTime: MediaTime;
tracks: SceneTracks;
playheadTime: MediaTime;
zoomLevel: number;
}): {
snappedAnchorStartTime: MediaTime;
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 = addMediaTime({
a: anchorStartTime,
b: member.timeOffset,
});
const memberStartSnap = resolveTimelineSnap({
targetTime: memberStartTime,
snapPoints,
maxSnapDistance,
});
if (
memberStartSnap.snapPoint &&
memberStartSnap.snapDistance < closestSnapDistance
) {
closestSnapDistance = memberStartSnap.snapDistance;
snappedAnchorStartTime = subMediaTime({
a: memberStartSnap.snappedTime as MediaTime,
b: member.timeOffset,
});
snapPoint = memberStartSnap.snapPoint;
}
const memberEndSnap = resolveTimelineSnap({
targetTime: addMediaTime({
a: memberStartTime,
b: member.duration,
}),
snapPoints,
maxSnapDistance,
});
if (
memberEndSnap.snapPoint &&
memberEndSnap.snapDistance < closestSnapDistance
) {
closestSnapDistance = memberEndSnap.snapDistance;
snappedAnchorStartTime = subMediaTime({
a: subMediaTime({
a: memberEndSnap.snappedTime as MediaTime,
b: member.duration,
}),
b: member.timeOffset,
});
snapPoint = memberEndSnap.snapPoint;
}
}
return {
snappedAnchorStartTime,
snapPoint,
};
}
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