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