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* Copyright 2024 Adobe. All rights reserved.\n * This file is licensed to you under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License. You may obtain a copy\n * of the License at http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software distributed under\n * the License is distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS\n * OF ANY KIND, either express or implied. See the License for the specific language\n * governing permissions and limitations under the License.\n */\n\nimport {DropTarget, DropTargetDelegate, Key, LayoutDelegate, Node} from '@react-types/shared';\nimport {InvalidationContext} from '../virtualizer/types';\nimport {Layout} from '../virtualizer/Layout';\nimport {LayoutInfo} from '../virtualizer/LayoutInfo';\nimport {Point} from '../virtualizer/Point';\nimport {Rect} from '../virtualizer/Rect';\nimport {Size} from '../virtualizer/Size';\n\nexport interface WaterfallLayoutOptions {\n  /**\n   * The minimum item size.\n   *\n   * @default 200 x 200\n   */\n  minItemSize?: Size;\n  /**\n   * The maximum item size.\n   *\n   * @default Infinity\n   */\n  maxItemSize?: Size;\n  /**\n   * The minimum space required between items.\n   *\n   * @default 18 x 18\n   */\n  minSpace?: Size;\n  /**\n   * The maximum allowed horizontal space between items.\n   *\n   * @default Infinity\n   */\n  maxHorizontalSpace?: number;\n  /**\n   * The maximum number of columns.\n   *\n   * @default Infinity\n   */\n  maxColumns?: number;\n  /**\n   * The thickness of the drop indicator.\n   *\n   * @default 2\n   */\n  dropIndicatorThickness?: number;\n  /**\n   * The fixed height of a loader element in px. This loader is specifically for \"load more\"\n   * elements rendered when loading more rows at the root level or inside nested row/sections.\n   *\n   * @default 48\n   */\n  loaderHeight?: number;\n}\n\nclass WaterfallLayoutInfo extends LayoutInfo {\n  column = 0;\n  index = 0;\n\n  copy(): WaterfallLayoutInfo {\n    let res = super.copy() as WaterfallLayoutInfo;\n    res.column = this.column;\n    res.index = this.index;\n    return res;\n  }\n}\n\nconst DEFAULT_OPTIONS = {\n  minItemSize: new Size(200, 200),\n  maxItemSize: new Size(Infinity, Infinity),\n  minSpace: new Size(18, 18),\n  maxSpace: Infinity,\n  maxColumns: Infinity,\n  dropIndicatorThickness: 2,\n  loaderHeight: 48\n};\n\nexport class WaterfallLayout<\n  T extends object,\n  O extends WaterfallLayoutOptions = WaterfallLayoutOptions\n>\n  extends Layout<Node<T>, O>\n  implements LayoutDelegate, DropTargetDelegate\n{\n  private contentSize: Size = new Size();\n  private layoutInfos: Map<Key, WaterfallLayoutInfo> = new Map();\n  protected numColumns = 0;\n  protected dropIndicatorThickness = 2;\n  private margin: number = 0;\n\n  shouldInvalidateLayoutOptions(newOptions: O, oldOptions: O): boolean {\n    return (\n      newOptions.maxColumns !== oldOptions.maxColumns ||\n      newOptions.dropIndicatorThickness !== oldOptions.dropIndicatorThickness ||\n      !(newOptions.minItemSize || DEFAULT_OPTIONS.minItemSize).equals(\n        oldOptions.minItemSize || DEFAULT_OPTIONS.minItemSize\n      ) ||\n      !(newOptions.maxItemSize || DEFAULT_OPTIONS.maxItemSize).equals(\n        oldOptions.maxItemSize || DEFAULT_OPTIONS.maxItemSize\n      ) ||\n      !(newOptions.minSpace || DEFAULT_OPTIONS.minSpace).equals(\n        oldOptions.minSpace || DEFAULT_OPTIONS.minSpace\n      ) ||\n      newOptions.maxHorizontalSpace !== oldOptions.maxHorizontalSpace ||\n      newOptions.loaderHeight !== oldOptions.loaderHeight\n    );\n  }\n\n  update(invalidationContext: InvalidationContext<O>): void {\n    let {\n      minItemSize = DEFAULT_OPTIONS.minItemSize,\n      maxItemSize = DEFAULT_OPTIONS.maxItemSize,\n      minSpace = DEFAULT_OPTIONS.minSpace,\n      maxHorizontalSpace = DEFAULT_OPTIONS.maxSpace,\n      maxColumns = DEFAULT_OPTIONS.maxColumns,\n      dropIndicatorThickness = DEFAULT_OPTIONS.dropIndicatorThickness,\n      loaderHeight = DEFAULT_OPTIONS.loaderHeight\n    } = invalidationContext.layoutOptions || {};\n    this.dropIndicatorThickness = dropIndicatorThickness;\n    let virtualizerWidth = this.virtualizer!.size.width;\n\n    // The max item width is always the entire viewport.\n    // If the max item height is infinity, scale in proportion to the max width.\n    let maxItemWidth = Math.min(maxItemSize.width, virtualizerWidth);\n    let maxItemHeight = Number.isFinite(maxItemSize.height)\n      ? maxItemSize.height\n      : Math.floor((minItemSize.height / minItemSize.width) * maxItemWidth);\n\n    // Compute the number of rows and columns needed to display the content\n    let columns = Math.floor(virtualizerWidth / (minItemSize.width + minSpace.width));\n    let numColumns = Math.max(1, Math.min(maxColumns, columns));\n\n    // Compute the available width (minus the space between items)\n    let width = virtualizerWidth - minSpace.width * Math.max(0, numColumns);\n\n    // Compute the item width based on the space available\n    let itemWidth = Math.floor(width / numColumns);\n    itemWidth = Math.max(minItemSize.width, Math.min(maxItemWidth, itemWidth));\n\n    // Compute the item height, which is proportional to the item width\n    let t = (itemWidth - minItemSize.width) / Math.max(1, maxItemWidth - minItemSize.width);\n    let itemHeight = minItemSize.height + Math.floor((maxItemHeight - minItemSize.height) * t);\n    itemHeight = Math.max(minItemSize.height, Math.min(maxItemHeight, itemHeight));\n\n    // Compute the horizontal spacing, content height and horizontal margin\n    let horizontalSpacing = Math.min(\n      Math.max(maxHorizontalSpace, minSpace.width),\n      Math.floor((virtualizerWidth - numColumns * itemWidth) / (numColumns + 1))\n    );\n    this.margin = Math.floor(\n      (virtualizerWidth - numColumns * itemWidth - horizontalSpacing * (numColumns + 1)) / 2\n    );\n\n    // Setup an array of column heights\n    let columnHeights = Array(numColumns).fill(minSpace.height);\n    let newLayoutInfos = new Map();\n    let index = 0;\n    let addNode = (key: Key, node: Node<T>) => {\n      let oldLayoutInfo = this.layoutInfos.get(key);\n      let height = itemHeight;\n      let estimatedSize = true;\n      if (oldLayoutInfo) {\n        height = (oldLayoutInfo.rect.height / oldLayoutInfo.rect.width) * itemWidth;\n        estimatedSize =\n          invalidationContext.sizeChanged ||\n          oldLayoutInfo.estimatedSize ||\n          oldLayoutInfo.content !== node;\n      }\n\n      // Figure out which column to place the item in, and compute its position.\n      // Preserve the previous column index so items don't jump around during resizing unless the number of columns changed.\n      let prevColumn =\n        numColumns === this.numColumns &&\n        oldLayoutInfo &&\n        oldLayoutInfo.index === index &&\n        oldLayoutInfo.rect.y < this.virtualizer!.visibleRect.maxY\n          ? oldLayoutInfo.column\n          : undefined;\n      let column =\n        prevColumn ??\n        columnHeights.reduce((minIndex, h, i) => (h < columnHeights[minIndex] ? i : minIndex), 0);\n      let x = horizontalSpacing + column * (itemWidth + horizontalSpacing) + this.margin;\n      let y = columnHeights[column];\n\n      let rect = new Rect(x, y, itemWidth, height);\n      let layoutInfo = new WaterfallLayoutInfo(node.type, key, rect);\n      layoutInfo.estimatedSize = estimatedSize;\n      layoutInfo.allowOverflow = true;\n      layoutInfo.content = node;\n      layoutInfo.column = column;\n      layoutInfo.index = index++;\n      newLayoutInfos.set(key, layoutInfo);\n\n      columnHeights[column] += layoutInfo.rect.height + minSpace.height;\n    };\n\n    let collection = this.virtualizer!.collection;\n    let skeletonCount = 0;\n    for (let node of collection) {\n      if (node.type === 'skeleton') {\n        // Add skeleton cards until every column has at least one, and we fill the viewport.\n        let startingHeights = [...columnHeights];\n        while (\n          !columnHeights.every((h, i) => h !== startingHeights[i]) ||\n          Math.min(...columnHeights) < this.virtualizer!.size.height\n        ) {\n          let key = `${node.key}-${skeletonCount++}`;\n          let content = this.layoutInfos.get(key)?.content || {...node};\n          addNode(key, content);\n        }\n        break;\n      } else if (node.type !== 'loader') {\n        addNode(node.key, node);\n      }\n    }\n\n    // Reset all columns to the maximum for the next section. If loading, set to 0 so virtualizer doesn't render its body since there aren't items to render,\n    // except if we are performing skeleton loading\n    let isEmptyOrLoading =\n      collection?.size === 0 && collection.getItem(collection.getFirstKey()!)?.type !== 'skeleton';\n    let maxHeight = isEmptyOrLoading ? 0 : Math.max(...columnHeights);\n\n    // Always add the loader sentinel if present in the collection so we can make sure it is never virtualized out.\n    // Add it under the first column for simplicity\n    let lastNode = collection.getItem(collection.getLastKey()!);\n    if (lastNode?.type === 'loader') {\n      if (skeletonCount > 0 || !lastNode.props.isLoading) {\n        loaderHeight = 0;\n      }\n      const loaderWidth = virtualizerWidth - horizontalSpacing * 2;\n      // Note that if the user provides isLoading to their sentinel during a case where they only want to render the emptyState, this will reserve\n      // room for the loader alongside rendering the emptyState\n      let rect = new Rect(horizontalSpacing, maxHeight, loaderWidth, loaderHeight);\n      let layoutInfo = new LayoutInfo('loader', lastNode.key, rect);\n      newLayoutInfos.set(lastNode.key, layoutInfo);\n      maxHeight = layoutInfo.rect.maxY;\n    }\n\n    this.contentSize = new Size(this.virtualizer!.size.width, maxHeight);\n    this.layoutInfos = newLayoutInfos;\n    this.numColumns = numColumns;\n  }\n\n  getLayoutInfo(key: Key): LayoutInfo {\n    return this.layoutInfos.get(key)!;\n  }\n\n  getContentSize(): Size {\n    return this.contentSize;\n  }\n\n  getVisibleLayoutInfos(rect: Rect): LayoutInfo[] {\n    let layoutInfos: LayoutInfo[] = [];\n    for (let layoutInfo of this.layoutInfos.values()) {\n      if (\n        layoutInfo.rect.intersects(rect) ||\n        this.virtualizer!.isPersistedKey(layoutInfo.key) ||\n        layoutInfo.type === 'loader'\n      ) {\n        layoutInfos.push(layoutInfo);\n      }\n    }\n    return layoutInfos;\n  }\n\n  updateItemSize(key: Key, size: Size): boolean {\n    let layoutInfo = this.layoutInfos.get(key);\n    if (!size || !layoutInfo) {\n      return false;\n    }\n\n    if (size.height !== layoutInfo.rect.height) {\n      let newLayoutInfo = layoutInfo.copy();\n      newLayoutInfo.rect.height = size.height;\n      newLayoutInfo.estimatedSize = false;\n      this.layoutInfos.set(key, newLayoutInfo);\n      return true;\n    }\n\n    return false;\n  }\n\n  // Override keyboard navigation to work spatially.\n  getKeyRightOf(key: Key): Key | null {\n    let layoutInfo = this.getLayoutInfo(key);\n    if (!layoutInfo) {\n      return null;\n    }\n\n    let rect = new Rect(\n      layoutInfo.rect.maxX,\n      layoutInfo.rect.y,\n      this.virtualizer!.visibleRect.maxX - layoutInfo.rect.maxX,\n      layoutInfo.rect.height\n    );\n    let layoutInfos = this.getVisibleLayoutInfos(rect);\n    let bestKey: Key | null = null;\n    let bestDistance = Infinity;\n    for (let candidate of layoutInfos) {\n      if (candidate.key === key) {\n        continue;\n      }\n\n      // Find the closest item in the x direction with the most overlap in the y direction.\n      let deltaX = candidate.rect.x - rect.x;\n      let overlapY = Math.min(candidate.rect.maxY, rect.maxY) - Math.max(candidate.rect.y, rect.y);\n      let distance = deltaX - overlapY;\n      if (distance < bestDistance) {\n        bestDistance = distance;\n        bestKey = candidate.key;\n      }\n    }\n\n    return bestKey;\n  }\n\n  getKeyLeftOf(key: Key): Key | null {\n    let layoutInfo = this.getLayoutInfo(key);\n    if (!layoutInfo) {\n      return null;\n    }\n\n    let rect = new Rect(0, layoutInfo.rect.y, layoutInfo.rect.x, layoutInfo.rect.height);\n    let layoutInfos = this.getVisibleLayoutInfos(rect);\n    let bestKey: Key | null = null;\n    let bestDistance = Infinity;\n    for (let candidate of layoutInfos) {\n      if (candidate.key === key) {\n        continue;\n      }\n\n      // Find the closest item in the x direction with the most overlap in the y direction.\n      let deltaX = rect.maxX - candidate.rect.maxX;\n      let overlapY = Math.min(candidate.rect.maxY, rect.maxY) - Math.max(candidate.rect.y, rect.y);\n      let distance = deltaX - overlapY;\n      if (distance < bestDistance) {\n        bestDistance = distance;\n        bestKey = candidate.key;\n      }\n    }\n\n    return bestKey;\n  }\n\n  // This overrides the default behavior of shift selection to work spatially\n  // rather than following the order of the items in the collection (which may appear unpredictable).\n  getKeyRange(from: Key, to: Key): Key[] {\n    let fromLayoutInfo = this.getLayoutInfo(from);\n    let toLayoutInfo = this.getLayoutInfo(to);\n    if (!fromLayoutInfo || !toLayoutInfo) {\n      return [];\n    }\n\n    // Find items where half of the area intersects the rectangle\n    // formed from the first item to the last item in the range.\n    let rect = fromLayoutInfo.rect.union(toLayoutInfo.rect);\n    let keys: Key[] = [];\n    for (let layoutInfo of this.layoutInfos.values()) {\n      if (rect.intersection(layoutInfo.rect).area > layoutInfo.rect.area / 2) {\n        keys.push(layoutInfo.key);\n      }\n    }\n    return keys;\n  }\n\n  getDropTargetFromPoint(x: number, y: number): DropTarget {\n    if (this.layoutInfos.size === 0) {\n      return {type: 'root'};\n    }\n\n    x += this.virtualizer!.visibleRect.x;\n    y += this.virtualizer!.visibleRect.y;\n    let key = this.virtualizer!.keyAtPoint(new Point(x, y));\n    if (key == null) {\n      return {type: 'root'};\n    }\n\n    // Only support \"on\" drop position in waterfall layout.\n    // Reordering doesn't make sense because the items don't have a deterministic order.\n    return {\n      type: 'item',\n      key,\n      dropPosition: 'on'\n    };\n  }\n}\n"],"names":[],"version":3,"file":"WaterfallLayout.cjs.map"}