{
  "$schema": "https://ui.shadcn.com/schema/registry-item.json",
  "name": "tree-09",
  "title": "Double-click to open",
  "description": "A click selects a folder and a double click or Enter opens it, while the highlight glides to the selected row.",
  "dependencies": [
    "@base-ui/react",
    "@headless-tree/core",
    "motion"
  ],
  "registryDependencies": [
    "https://ui.ndekocode.dev/r/icons.json",
    "https://ui.ndekocode.dev/r/live-region.json",
    "https://ui.ndekocode.dev/r/motion-presets.json",
    "https://ui.ndekocode.dev/r/motion-word-roll.json",
    "https://ui.ndekocode.dev/r/theme.json",
    "https://ui.ndekocode.dev/r/tree.json",
    "https://ui.ndekocode.dev/r/use-prefers-reduced-motion.json",
    "https://ui.ndekocode.dev/r/utils.json"
  ],
  "files": [
    {
      "path": "registry/ndeko/components/tree/tree-09.tsx",
      "content": "'use client';\n\nimport {\n  hotkeysCoreFeature,\n  selectionFeature,\n  syncDataLoaderFeature,\n  type FeatureImplementation,\n  type ItemInstance,\n  type TreeInstance,\n} from '@headless-tree/core';\n\nimport { WordRoll } from '@/components/core/word-roll';\nimport { FolderIcon } from '@/registry/ndeko/lib/icons';\nimport { LiveRegion } from '@/registry/ndeko/ui/live-region';\nimport { Tree, TreeItemLabel, useTree } from '@/registry/ndeko/ui/tree';\n\nimport {\n  branchLoaderOf,\n  hasChildren,\n  indexBranches,\n  nameOf,\n  parentIdsOf,\n  type Branch,\n} from './_parts/tree-data';\nimport { FolderGlyph } from './_parts/tree-glyphs';\nimport { TreeRow, TreeRows } from './_parts/tree-rows';\n\nconst WORKSPACE: Branch = {\n  id: 'workspace',\n  name: 'Wrenfield workspace',\n  children: [\n    {\n      id: 'projects',\n      name: 'Projects',\n      children: [\n        {\n          id: 'storefront',\n          name: 'Storefront',\n          children: [\n            { id: 'storefront-source', name: 'Source' },\n            { id: 'storefront-tests', name: 'Tests' },\n            { id: 'storefront-docs', name: 'Docs' },\n          ],\n        },\n        {\n          id: 'billing-service',\n          name: 'Billing service',\n          children: [\n            { id: 'billing-source', name: 'Source' },\n            { id: 'billing-migrations', name: 'Migrations' },\n          ],\n        },\n        { id: 'mobile-app', name: 'Mobile app' },\n      ],\n    },\n    {\n      id: 'shared',\n      name: 'Shared',\n      children: [\n        { id: 'brand', name: 'Brand' },\n        { id: 'legal', name: 'Legal' },\n      ],\n    },\n    { id: 'archive', name: 'Archive' },\n  ],\n};\n\nconst FOLDERS = indexBranches(WORKSPACE);\n\nconst FOLDER_LOADER = branchLoaderOf(FOLDERS);\n\nconst PARENT_IDS = parentIdsOf(FOLDERS);\n\nconst OPEN_AT_START = ['projects', 'storefront'];\n\nconst SELECTED_AT_START = ['storefront-tests'];\n\nfunction toggleFolder(row: ItemInstance<Branch>) {\n  if (!row.isFolder()) {\n    return;\n  }\n  if (row.isExpanded()) {\n    row.collapse();\n    return;\n  }\n  row.expand();\n}\n\nfunction applyClickToSelection(\n  tree: TreeInstance<Branch>,\n  row: ItemInstance<Branch>,\n  event: React.MouseEvent\n) {\n  const keepsOthers = event.ctrlKey || event.metaKey;\n  if (event.shiftKey) {\n    row.selectUpTo(keepsOthers);\n    return;\n  }\n  if (keepsOthers) {\n    row.toggleSelect();\n    return;\n  }\n  tree.setSelectedItems([row.getId()]);\n}\n\nfunction openFocusedFolder(_event: KeyboardEvent, tree: TreeInstance<Branch>) {\n  const focusedRow = tree.getFocusedItem();\n  toggleFolder(focusedRow);\n}\n\n/* A click only selects here, as in a file manager: opening a folder takes a double click, Enter or the arrow keys. */\nconst openOnDoubleClick: FeatureImplementation<Branch> = {\n  itemInstance: {\n    getProps: ({ tree, item, prev }) => {\n      function selectRow(event: React.MouseEvent) {\n        applyClickToSelection(tree, item, event);\n        item.setFocused();\n      }\n\n      function openRow() {\n        item.primaryAction();\n        toggleFolder(item);\n      }\n\n      return { ...prev?.(), onClick: selectRow, onDoubleClick: openRow };\n    },\n  },\n};\n\nfunction pathNamesOf(folderId: string): string[] {\n  if (folderId === WORKSPACE.id) {\n    return [];\n  }\n  const parentId = PARENT_IDS[folderId];\n  const parentPath = pathNamesOf(parentId);\n  const folder = FOLDERS[folderId];\n  return [...parentPath, folder.name];\n}\n\nfunction selectionLabelOf(selectedIds: string[]) {\n  if (selectedIds.length === 0) {\n    return 'No folder selected';\n  }\n  if (selectedIds.length > 1) {\n    return `${selectedIds.length} folders selected`;\n  }\n  const [onlyId] = selectedIds;\n  const names = pathNamesOf(onlyId);\n  return names.join(' / ');\n}\n\ntype FolderMarkProps = {\n  canOpen: boolean;\n};\n\nfunction FolderMark({ canOpen }: FolderMarkProps) {\n  if (canOpen) {\n    return <FolderGlyph />;\n  }\n  return <FolderIcon className='text-muted-foreground size-4' />;\n}\n\nexport default function Tree09() {\n  const tree = useTree<Branch>({\n    initialState: {\n      expandedItems: OPEN_AT_START,\n      selectedItems: SELECTED_AT_START,\n    },\n    rootItemId: WORKSPACE.id,\n    getItemName: nameOf,\n    isItemFolder: hasChildren,\n    dataLoader: FOLDER_LOADER,\n    hotkeys: {\n      customOpenFolder: { hotkey: 'Enter', handler: openFocusedFolder },\n    },\n    features: [\n      syncDataLoaderFeature,\n      hotkeysCoreFeature,\n      selectionFeature,\n      openOnDoubleClick,\n    ],\n  });\n  const { selectedItems } = tree.getState();\n  const selectionLabel = selectionLabelOf(selectedItems);\n\n  return (\n    <div className='relative flex w-full flex-col gap-2'>\n      <Tree aria-label={WORKSPACE.name} tree={tree}>\n        <TreeRows>\n          {tree.getItems().map((item) => (\n            <TreeRow key={item.getId()} item={item}>\n              <TreeItemLabel>\n                <FolderMark canOpen={item.isFolder()} />\n                <span className='truncate'>{item.getItemName()}</span>\n              </TreeItemLabel>\n            </TreeRow>\n          ))}\n        </TreeRows>\n      </Tree>\n      <p className='text-muted-foreground flex flex-wrap items-baseline gap-x-1.5 text-xs'>\n        Working folder\n        <WordRoll\n          text={selectionLabel}\n          className='text-foreground font-medium'\n        />\n      </p>\n      <LiveRegion message={`Working folder: ${selectionLabel}`} />\n    </div>\n  );\n}\n",
      "type": "registry:component",
      "target": "components/tree/tree-09.tsx"
    },
    {
      "path": "registry/ndeko/components/tree/_parts/tree-data.ts",
      "content": "import {\n  isOrderedDragTarget,\n  type DragTarget,\n  type ItemInstance,\n} from '@headless-tree/core';\n\nexport type Branch = {\n  id: string;\n  name: string;\n  children?: Branch[];\n};\n\ntype BranchIndex = Record<string, Branch>;\n\nexport type FlatNode = {\n  name: string;\n  isFolder: boolean;\n  childIds: string[];\n};\n\nexport type FlatNodes = Record<string, FlatNode>;\n\nfunction idOf(branch: Branch) {\n  return branch.id;\n}\n\nfunction childIdsOf(branch: Branch) {\n  const children = branch.children ?? [];\n  return children.map(idOf);\n}\n\nfunction collectBranches(branch: Branch, index: BranchIndex) {\n  index[branch.id] = branch;\n  const children = branch.children ?? [];\n  children.forEach((child) => collectBranches(child, index));\n}\n\nexport function indexBranches(root: Branch) {\n  const index: BranchIndex = {};\n  collectBranches(root, index);\n  return index;\n}\n\nexport function branchLoaderOf(index: BranchIndex) {\n  function getItem(branchId: string) {\n    return index[branchId];\n  }\n\n  function getChildren(branchId: string) {\n    const branch = index[branchId];\n    return childIdsOf(branch);\n  }\n\n  return { getItem, getChildren };\n}\n\nexport function nameOf<Data extends { name: string }>(\n  item: ItemInstance<Data>\n) {\n  return item.getItemData().name;\n}\n\nexport function hasChildren(item: ItemInstance<Branch>) {\n  const children = item.getItemData().children ?? [];\n  return children.length > 0;\n}\n\nexport function leafIdsOf(index: BranchIndex) {\n  const branches = Object.values(index);\n  const leaves = branches.filter((branch) => branch.children === undefined);\n  return leaves.map(idOf);\n}\n\nexport function folderIdsOf(index: BranchIndex) {\n  const branches = Object.values(index);\n  const folders = branches.filter((branch) => branch.children !== undefined);\n  return folders.map(idOf);\n}\n\n/* A tree may list a checked id twice, so the ids are counted from the side that has each of them once. */\nexport function countIn(ids: string[], pickedIds: string[]) {\n  const picked = ids.filter((id) => pickedIds.includes(id));\n  return picked.length;\n}\n\nexport function parentIdsOf(index: BranchIndex) {\n  const parentIds: Record<string, string> = {};\n  for (const branch of Object.values(index)) {\n    for (const childId of childIdsOf(branch)) {\n      parentIds[childId] = branch.id;\n    }\n  }\n  return parentIds;\n}\n\nfunction flatNodeOf(branch: Branch): FlatNode {\n  const isFolder = branch.children !== undefined;\n  const childIds = childIdsOf(branch);\n  return { name: branch.name, isFolder, childIds };\n}\n\nexport function flattenBranches(root: Branch) {\n  const index = indexBranches(root);\n  const nodes: FlatNodes = {};\n  for (const [branchId, branch] of Object.entries(index)) {\n    nodes[branchId] = flatNodeOf(branch);\n  }\n  return nodes;\n}\n\nexport function isFlatFolder(item: ItemInstance<FlatNode>) {\n  return item.getItemData().isFolder;\n}\n\nfunction withoutIds(ids: string[], removedIds: string[]) {\n  return ids.filter((id) => !removedIds.includes(id));\n}\n\nfunction insertedAt(ids: string[], index: number, addedIds: string[]) {\n  const before = ids.slice(0, index);\n  const after = ids.slice(index);\n  return [...before, ...addedIds, ...after];\n}\n\nfunction slotOf(target: DragTarget<FlatNode>, siblingCount: number) {\n  if (isOrderedDragTarget(target)) {\n    return target.insertionIndex;\n  }\n  return siblingCount;\n}\n\n/** One update for the whole drop, so no render ever shows the moved rows missing from the tree. */\nexport function moveNodes(\n  nodes: FlatNodes,\n  movedIds: string[],\n  target: DragTarget<FlatNode>\n) {\n  const moved: FlatNodes = {};\n  for (const [nodeId, node] of Object.entries(nodes)) {\n    const childIds = withoutIds(node.childIds, movedIds);\n    moved[nodeId] = { ...node, childIds };\n  }\n  const parentId = target.item.getId();\n  const parent = moved[parentId];\n  const slot = slotOf(target, parent.childIds.length);\n  const childIds = insertedAt(parent.childIds, slot, movedIds);\n  moved[parentId] = { ...parent, childIds };\n  return moved;\n}\n",
      "type": "registry:component",
      "target": "components/tree/_parts/tree-data.ts"
    },
    {
      "path": "registry/ndeko/components/tree/_parts/tree-glyphs.tsx",
      "content": "import {\n  FileIcon,\n  FolderIcon,\n  FolderOpenIcon,\n  type Icon,\n} from '@/registry/ndeko/lib/icons';\nimport { cn } from '@/registry/ndeko/lib/utils';\n\nconst LAYER =\n  'text-muted-foreground size-4 transition-[opacity,scale,filter] duration-150 ease-(--ease-out-strong) [grid-area:1/1]';\n\nconst GONE_WHEN_OPEN =\n  'in-aria-[expanded=true]:scale-60 in-aria-[expanded=true]:opacity-0 in-aria-[expanded=true]:blur-[2px]';\n\nconst GONE_WHEN_CLOSED =\n  'in-aria-[expanded=false]:scale-60 in-aria-[expanded=false]:opacity-0 in-aria-[expanded=false]:blur-[2px]';\n\ntype OpeningGlyphProps = {\n  closed: Icon;\n  open: Icon;\n};\n\n/* The swap reads aria-expanded on the row around it, so it needs no state and costs no script. */\nexport function OpeningGlyph({\n  closed: Closed,\n  open: Open,\n}: OpeningGlyphProps) {\n  return (\n    <span className='grid shrink-0'>\n      <Closed className={cn(LAYER, GONE_WHEN_OPEN)} />\n      <Open className={cn(LAYER, GONE_WHEN_CLOSED)} />\n    </span>\n  );\n}\n\nexport function FolderGlyph() {\n  return <OpeningGlyph closed={FolderIcon} open={FolderOpenIcon} />;\n}\n\ntype EntryGlyphProps = {\n  isFolder: boolean;\n  leaf?: Icon;\n};\n\nexport function EntryGlyph({\n  isFolder,\n  leaf: Leaf = FileIcon,\n}: EntryGlyphProps) {\n  if (isFolder) {\n    return <FolderGlyph />;\n  }\n  return <Leaf className='text-muted-foreground size-4' />;\n}\n",
      "type": "registry:component",
      "target": "components/tree/_parts/tree-glyphs.tsx"
    },
    {
      "path": "registry/ndeko/components/tree/_parts/tree-rows.tsx",
      "content": "'use client';\n\nimport type { useRender } from '@base-ui/react/use-render';\nimport type { ItemInstance } from '@headless-tree/core';\nimport { AnimatePresence, motion, useIsPresent } from 'motion/react';\nimport { createContext, useContext, useId, useState } from 'react';\n\nimport { usePrefersReducedMotion } from '@/registry/ndeko/hooks/use-prefers-reduced-motion';\nimport {\n  EASE_IN_OUT_STRONG,\n  rowPresenceOf,\n  springOf,\n} from '@/registry/ndeko/lib/motion-presets';\nimport { cn } from '@/registry/ndeko/lib/utils';\nimport { TreeItem } from '@/registry/ndeko/ui/tree';\n\n/*\n * The highlight is one element shared by every row of a tree. It glides to the row that mounts it\n * only when that row gives it another layout dependency than the row it left, hence the row id.\n */\nconst HighlightContext = createContext<string | undefined>(undefined);\n\nconst TRAVEL = { duration: 0.25, ease: EASE_IN_OUT_STRONG };\n\nconst NO_TRAVEL = { duration: 0 };\n\nconst FRAME = 'flex min-w-0 items-center gap-1.5';\n\nconst ITEM = 'relative min-w-0 flex-1 ps-(--row-indent) pb-0.5';\n\nconst HIGHLIGHT =\n  'bg-primary/[0.08] pointer-events-none absolute start-(--row-indent) end-0 top-0 bottom-0.5 -z-10 rounded-md';\n\n/* The highlight glides between rows, so the label stops drawing its own tint on a selected row. A search match keeps its colour. */\nconst LABEL_WITHOUT_TINT =\n  '[&[data-selected=true]:not([data-search-match=true])_[data-slot=tree-item-label]]:bg-transparent';\n\n/* One hairline per level of nesting, each under the icon of the folder it belongs to. */\nconst GUIDES = [\n  'bg-no-repeat [background-position:-0.25rem_0] [background-size:var(--row-indent)_100%]',\n  'bg-[repeating-linear-gradient(to_right,transparent_0_calc(var(--tree-indent)_-_var(--hairline)),var(--border)_calc(var(--tree-indent)_-_var(--hairline))_var(--tree-indent))]',\n].join(' ');\n\nfunction travelOf(shouldReduceMotion: boolean) {\n  if (shouldReduceMotion) {\n    return NO_TRAVEL;\n  }\n  return TRAVEL;\n}\n\nfunction layoutOf(travels: boolean) {\n  if (travels) {\n    return 'position' as const;\n  }\n  return false;\n}\n\n/* A tree set up without the selection feature keeps no list of selected rows. */\nfunction selectedIdsOf<T>(item: ItemInstance<T>) {\n  const { selectedItems } = item.getTree().getState();\n  return selectedItems ?? [];\n}\n\n/* A row that left the visible tree reports level -1 while it fades out: it keeps the indent it had. */\nfunction useShownLevel<T>(item: ItemInstance<T>) {\n  const { level } = item.getItemMeta();\n  const [shownLevel, setShownLevel] = useState(level);\n  const isInTree = level >= 0;\n  const hasMoved = level !== shownLevel;\n  if (isInTree && hasMoved) {\n    setShownLevel(level);\n    return level;\n  }\n  return shownLevel;\n}\n\ntype TreeRowsProps = {\n  children: React.ReactNode;\n};\n\n/* Rows that are there when the tree mounts do not animate: only the ones a folder opens or closes later do. */\nexport function TreeRows({ children }: TreeRowsProps) {\n  const highlightId = useId();\n\n  return (\n    <HighlightContext.Provider value={highlightId}>\n      <AnimatePresence initial={false}>{children}</AnimatePresence>\n    </HighlightContext.Provider>\n  );\n}\n\ntype TreeRowProps<T> = {\n  item: ItemInstance<T>;\n  children: React.ReactNode;\n  leading?: React.ReactNode;\n  trailing?: React.ReactNode;\n  render?: useRender.ComponentProps<'button'>['render'];\n  hasGuides?: boolean;\n  travels?: boolean;\n  className?: string;\n};\n\nexport function TreeRow<T>({\n  item,\n  children,\n  leading,\n  trailing,\n  render,\n  hasGuides = false,\n  travels = false,\n  className,\n}: TreeRowProps<T>) {\n  const highlightId = useContext(HighlightContext);\n  const shouldReduceMotion = usePrefersReducedMotion();\n  const isPresent = useIsPresent();\n  const [isResizing, setIsResizing] = useState(false);\n  const level = useShownLevel(item);\n  const presence = rowPresenceOf(shouldReduceMotion);\n  const travel = travelOf(shouldReduceMotion);\n  const transition = { ...presence.transition, layout: travel };\n  const glide = springOf(shouldReduceMotion);\n  const layout = layoutOf(travels);\n  const itemId = item.getId();\n  const position = item.getItemMeta().index;\n  const selectedIds = selectedIdsOf(item);\n  const isSelected = selectedIds.includes(itemId);\n  const isOnlySelected = isSelected && selectedIds.length === 1;\n  /* A row on its way out keeps a plain tint, so its removal never waits for the highlight to land elsewhere. */\n  const hasGlidingTint = isOnlySelected && isPresent;\n  const hasStillTint = isSelected && !hasGlidingTint;\n  const isClipped = isResizing || !isPresent;\n  const frameStyle = {\n    '--row-indent': `calc(var(--tree-indent) * ${level})`,\n  } as React.CSSProperties;\n\n  function startResizing() {\n    setIsResizing(true);\n  }\n\n  function stopResizing() {\n    setIsResizing(false);\n  }\n\n  return (\n    <motion.div\n      data-slot='tree-row'\n      style={frameStyle}\n      className={cn(FRAME, isClipped && 'overflow-hidden')}\n      layout={layout}\n      layoutDependency={position}\n      onAnimationStart={startResizing}\n      onAnimationComplete={stopResizing}\n      {...presence}\n      transition={transition}\n    >\n      {leading}\n      <TreeItem\n        item={item}\n        render={render}\n        className={cn(ITEM, LABEL_WITHOUT_TINT, hasGuides && GUIDES, className)}\n      >\n        {hasGlidingTint && (\n          <motion.span\n            layoutId={highlightId}\n            layoutDependency={itemId}\n            transition={glide}\n            aria-hidden='true'\n            className={HIGHLIGHT}\n          />\n        )}\n        {hasStillTint && <span aria-hidden='true' className={HIGHLIGHT} />}\n        {children}\n      </TreeItem>\n      {trailing}\n    </motion.div>\n  );\n}\n",
      "type": "registry:component",
      "target": "components/tree/_parts/tree-rows.tsx"
    }
  ],
  "categories": [
    "components",
    "tree"
  ],
  "type": "registry:component"
}