{
  "version": 3,
  "sources": ["../../src/canvas/cluster-fade.ts"],
  "sourcesContent": ["import { useEffect, useRef, useState } from 'react'\nimport type { ClusterNode } from '../clustering/types'\n\nconst CLUSTER_FADE_MS = 150\n\nexport type ClusterFadePhase = 'entering' | 'present' | 'exiting'\n\nexport interface ClusterFadeNode {\n\tnode: ClusterNode\n\tphase: ClusterFadePhase\n}\n\n/**\n * Cross-fades the visible cluster nodes as the partition changes: a node that appears starts\n * `entering` and flips to `present` on the next frame, and one that leaves is kept as `exiting`\n * until the CSS transition has run. `resetKey` is compared by identity \u2014 a new cluster model\n * replaces the whole world, so its nodes snap to `present` instead of animating.\n */\nexport function useFadeVisibleNodes(\n\tnodes: readonly ClusterNode[],\n\tresetKey: object\n): ClusterFadeNode[] {\n\tconst resetKeyRef = useRef(resetKey)\n\tconst didReset = resetKeyRef.current !== resetKey\n\tif (didReset) {\n\t\tresetKeyRef.current = resetKey\n\t}\n\n\tconst [fadeNodes, setFadeNodes] = useState<ClusterFadeNode[]>(() => toPresentFadeNodes(nodes))\n\tconst renderedNodes = didReset ? toPresentFadeNodes(nodes) : fadeNodes\n\n\tuseEffect(() => {\n\t\tsetFadeNodes(toPresentFadeNodes(nodes))\n\t\t// Resets only on a new model (resetKey); node-list changes within the same model are\n\t\t// handled by the reconcile effect below, which fades entries in/out instead of snapping.\n\t\t// eslint-disable-next-line react-hooks/exhaustive-deps\n\t}, [resetKey])\n\n\tuseEffect(() => {\n\t\tif (didReset) return\n\t\tsetFadeNodes((previous) => reconcileFadeNodes(previous, nodes))\n\t}, [didReset, nodes])\n\n\tconst hasEntering = renderedNodes.some((item) => item.phase === 'entering')\n\tuseEffect(() => {\n\t\tif (!hasEntering) return\n\t\tconst frame = requestAnimationFrame(() => {\n\t\t\tsetFadeNodes((previous) =>\n\t\t\t\tprevious.map((item) => (item.phase === 'entering' ? { ...item, phase: 'present' } : item))\n\t\t\t)\n\t\t})\n\t\treturn () => cancelAnimationFrame(frame)\n\t}, [hasEntering, renderedNodes])\n\n\tconst hasExiting = renderedNodes.some((item) => item.phase === 'exiting')\n\tuseEffect(() => {\n\t\tif (!hasExiting) return\n\t\tconst timeout = window.setTimeout(() => {\n\t\t\tsetFadeNodes((previous) => previous.filter((item) => item.phase !== 'exiting'))\n\t\t}, CLUSTER_FADE_MS)\n\t\treturn () => window.clearTimeout(timeout)\n\t}, [hasExiting, renderedNodes])\n\n\treturn renderedNodes\n}\n\nfunction toPresentFadeNodes(nodes: readonly ClusterNode[]): ClusterFadeNode[] {\n\treturn nodes.map((node) => ({ node, phase: 'present' }))\n}\n\nfunction reconcileFadeNodes(\n\tprevious: readonly ClusterFadeNode[],\n\tnextNodes: readonly ClusterNode[]\n): ClusterFadeNode[] {\n\tconst previousById = new Map(previous.map((item) => [item.node.id, item]))\n\tconst nextIds = new Set(nextNodes.map((node) => node.id))\n\tconst next: ClusterFadeNode[] = []\n\n\tfor (const node of nextNodes) {\n\t\tconst previousItem = previousById.get(node.id)\n\t\tnext.push({\n\t\t\tnode,\n\t\t\tphase:\n\t\t\t\tpreviousItem && previousItem.phase !== 'exiting'\n\t\t\t\t\t? previousItem.phase\n\t\t\t\t\t: previousItem\n\t\t\t\t\t\t? 'present'\n\t\t\t\t\t\t: 'entering',\n\t\t})\n\t}\n\n\tfor (const item of previous) {\n\t\tif (nextIds.has(item.node.id)) continue\n\t\tnext.push(item.phase === 'exiting' ? item : { ...item, phase: 'exiting' })\n\t}\n\n\treturn next\n}\n\nexport function clusterFadeClassName(phase: ClusterFadePhase): string {\n\treturn `tlui-cmt-cluster-fade tlui-cmt-cluster-fade--${phase}`\n}\n"],
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