react-grid-layout/dist/chunk-AWM66AWF.mjs.map

A draggable and resizable grid layout with responsive breakpoints, for React.

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* Grid calculation utilities.\n *\n * These functions convert between grid units and pixel positions.\n */\n\nimport type { Position, ResizeHandleAxis } from \"./types.js\";\n\n// ============================================================================\n// Types\n// ============================================================================\n\n/**\n * Parameters needed for position calculations.\n */\nexport interface PositionParams {\n  readonly margin: readonly [number, number];\n  readonly containerPadding: readonly [number, number];\n  readonly containerWidth: number;\n  readonly cols: number;\n  readonly rowHeight: number;\n  readonly maxRows: number;\n}\n\n// ============================================================================\n// Grid Column/Row Calculations\n// ============================================================================\n\n/**\n * Calculate the width of a single grid column in pixels.\n *\n * @param positionParams - Grid parameters\n * @returns Column width in pixels\n */\nexport function calcGridColWidth(positionParams: PositionParams): number {\n  const { margin, containerPadding, containerWidth, cols } = positionParams;\n  return (\n    (containerWidth - margin[0] * (cols - 1) - containerPadding[0] * 2) / cols\n  );\n}\n\n/**\n * Calculate the pixel size for a grid unit dimension (width or height).\n *\n * Can be called as:\n * - calcGridItemWHPx(w, colWidth, margin[0]) for width\n * - calcGridItemWHPx(h, rowHeight, margin[1]) for height\n *\n * @param gridUnits - Size in grid units\n * @param colOrRowSize - Column width or row height in pixels\n * @param marginPx - Margin between items in pixels\n * @returns Size in pixels\n */\nexport function calcGridItemWHPx(\n  gridUnits: number,\n  colOrRowSize: number,\n  marginPx: number\n): number {\n  // 0 * Infinity === NaN, which causes problems with resize constraints\n  if (!Number.isFinite(gridUnits)) return gridUnits;\n  return Math.round(\n    colOrRowSize * gridUnits + Math.max(0, gridUnits - 1) * marginPx\n  );\n}\n\n// ============================================================================\n// Position Calculations\n// ============================================================================\n\n/**\n * Calculate pixel position for a grid item.\n *\n * Returns left, top, width, height in pixels.\n *\n * @param positionParams - Grid parameters\n * @param x - X coordinate in grid units\n * @param y - Y coordinate in grid units\n * @param w - Width in grid units\n * @param h - Height in grid units\n * @param dragPosition - If present, use exact left/top from drag callbacks\n * @param resizePosition - If present, use exact dimensions from resize callbacks\n * @returns Position in pixels\n */\nexport function calcGridItemPosition(\n  positionParams: PositionParams,\n  x: number,\n  y: number,\n  w: number,\n  h: number,\n  dragPosition?: { top: number; left: number } | null,\n  resizePosition?: {\n    top: number;\n    left: number;\n    height: number;\n    width: number;\n  } | null\n): Position {\n  const { margin, containerPadding, rowHeight } = positionParams;\n  const colWidth = calcGridColWidth(positionParams);\n\n  let width: number;\n  let height: number;\n  let top: number;\n  let left: number;\n\n  // If resizing, use the exact width and height from resize callbacks\n  if (resizePosition) {\n    width = Math.round(resizePosition.width);\n    height = Math.round(resizePosition.height);\n  } else {\n    // Calculate from grid units\n    width = calcGridItemWHPx(w, colWidth, margin[0]);\n    height = calcGridItemWHPx(h, rowHeight, margin[1]);\n  }\n\n  // If dragging, use the exact left/top from drag callbacks\n  if (dragPosition) {\n    top = Math.round(dragPosition.top);\n    left = Math.round(dragPosition.left);\n  } else if (resizePosition) {\n    // If resizing, use the exact left/top from resize position\n    top = Math.round(resizePosition.top);\n    left = Math.round(resizePosition.left);\n  } else {\n    // Calculate from grid units\n    top = Math.round((rowHeight + margin[1]) * y + containerPadding[1]);\n    left = Math.round((colWidth + margin[0]) * x + containerPadding[0]);\n  }\n\n  // When not dragging or resizing, fix margin inconsistencies caused by rounding.\n  // Due to Math.round(), the gap between adjacent items can differ from the\n  // expected margin (e.g., 0px or 2px instead of 1px). We fix this by comparing\n  // where the next sibling would start vs where this item ends, and adjusting\n  // the width/height to maintain consistent margins.\n  if (!dragPosition && !resizePosition) {\n    if (Number.isFinite(w)) {\n      // Calculate where the next column's item would start\n      const siblingLeft = Math.round(\n        (colWidth + margin[0]) * (x + w) + containerPadding[0]\n      );\n      // Calculate actual margin: sibling start - (our left + our width)\n      const actualMarginRight = siblingLeft - left - width;\n      // Adjust width if margin doesn't match\n      if (actualMarginRight !== margin[0]) {\n        width += actualMarginRight - margin[0];\n      }\n    }\n\n    if (Number.isFinite(h)) {\n      // Calculate where the next row's item would start\n      const siblingTop = Math.round(\n        (rowHeight + margin[1]) * (y + h) + containerPadding[1]\n      );\n      // Calculate actual margin: sibling start - (our top + our height)\n      const actualMarginBottom = siblingTop - top - height;\n      // Adjust height if margin doesn't match\n      if (actualMarginBottom !== margin[1]) {\n        height += actualMarginBottom - margin[1];\n      }\n    }\n  }\n\n  return { top, left, width, height };\n}\n\n/**\n * Translate pixel coordinates to grid units.\n *\n * @param positionParams - Grid parameters\n * @param top - Top position in pixels (relative to parent)\n * @param left - Left position in pixels (relative to parent)\n * @param w - Width in grid units (for clamping)\n * @param h - Height in grid units (for clamping)\n * @returns x and y in grid units\n */\nexport function calcXY(\n  positionParams: PositionParams,\n  top: number,\n  left: number,\n  w: number,\n  h: number\n): { x: number; y: number } {\n  const { margin, containerPadding, cols, rowHeight, maxRows } = positionParams;\n  const colWidth = calcGridColWidth(positionParams);\n\n  // left = containerPaddingX + x * (colWidth + marginX)\n  // x = (left - containerPaddingX) / (colWidth + marginX)\n  let x = Math.round((left - containerPadding[0]) / (colWidth + margin[0]));\n  let y = Math.round((top - containerPadding[1]) / (rowHeight + margin[1]));\n\n  // Clamp to grid bounds\n  x = clamp(x, 0, cols - w);\n  y = clamp(y, 0, maxRows - h);\n\n  return { x, y };\n}\n\n/**\n * Translate pixel coordinates to grid units without clamping.\n *\n * Use this with the constraint system for custom boundary control.\n *\n * @param positionParams - Grid parameters\n * @param top - Top position in pixels (relative to parent)\n * @param left - Left position in pixels (relative to parent)\n * @returns x and y in grid units (unclamped)\n */\nexport function calcXYRaw(\n  positionParams: PositionParams,\n  top: number,\n  left: number\n): { x: number; y: number } {\n  const { margin, containerPadding, rowHeight } = positionParams;\n  const colWidth = calcGridColWidth(positionParams);\n\n  const x = Math.round((left - containerPadding[0]) / (colWidth + margin[0]));\n  const y = Math.round((top - containerPadding[1]) / (rowHeight + margin[1]));\n\n  return { x, y };\n}\n\n/**\n * Calculate grid units from pixel dimensions.\n *\n * @param positionParams - Grid parameters\n * @param width - Width in pixels\n * @param height - Height in pixels\n * @param x - X coordinate in grid units (for clamping)\n * @param y - Y coordinate in grid units (for clamping)\n * @param handle - Resize handle being used\n * @returns w, h in grid units\n */\nexport function calcWH(\n  positionParams: PositionParams,\n  width: number,\n  height: number,\n  x: number,\n  y: number,\n  handle: ResizeHandleAxis\n): { w: number; h: number } {\n  const { margin, maxRows, cols, rowHeight } = positionParams;\n  const colWidth = calcGridColWidth(positionParams);\n\n  // width = colWidth * w - (margin * (w - 1))\n  // w = (width + margin) / (colWidth + margin)\n  const w = Math.round((width + margin[0]) / (colWidth + margin[0]));\n  const h = Math.round((height + margin[1]) / (rowHeight + margin[1]));\n\n  // Clamp based on resize handle direction\n  let _w = clamp(w, 0, cols - x);\n  let _h = clamp(h, 0, maxRows - y);\n\n  // West handles can resize to full width\n  if (handle === \"sw\" || handle === \"w\" || handle === \"nw\") {\n    _w = clamp(w, 0, cols);\n  }\n\n  // North handles can resize to full height\n  if (handle === \"nw\" || handle === \"n\" || handle === \"ne\") {\n    _h = clamp(h, 0, maxRows);\n  }\n\n  return { w: _w, h: _h };\n}\n\n/**\n * Calculate grid units from pixel dimensions without clamping.\n *\n * Use this with the constraint system for custom size control.\n *\n * @param positionParams - Grid parameters\n * @param width - Width in pixels\n * @param height - Height in pixels\n * @returns w, h in grid units (unclamped, minimum 1)\n */\nexport function calcWHRaw(\n  positionParams: PositionParams,\n  width: number,\n  height: number\n): { w: number; h: number } {\n  const { margin, rowHeight } = positionParams;\n  const colWidth = calcGridColWidth(positionParams);\n\n  // width = colWidth * w - (margin * (w - 1))\n  // w = (width + margin) / (colWidth + margin)\n  const w = Math.max(\n    1,\n    Math.round((width + margin[0]) / (colWidth + margin[0]))\n  );\n  const h = Math.max(\n    1,\n    Math.round((height + margin[1]) / (rowHeight + margin[1]))\n  );\n\n  return { w, h };\n}\n\n// ============================================================================\n// Utility Functions\n// ============================================================================\n\n/**\n * Clamp a number between bounds.\n *\n * @param num - Number to clamp\n * @param lowerBound - Minimum value\n * @param upperBound - Maximum value\n * @returns Clamped value\n */\nexport function clamp(\n  num: number,\n  lowerBound: number,\n  upperBound: number\n): number {\n  return Math.max(Math.min(num, upperBound), lowerBound);\n}\n\n// ============================================================================\n// Grid Background Calculations\n// ============================================================================\n\n/**\n * Grid cell dimension information for rendering backgrounds or overlays.\n */\nexport interface GridCellDimensions {\n  /** Width of a single cell in pixels */\n  readonly cellWidth: number;\n  /** Height of a single cell in pixels */\n  readonly cellHeight: number;\n  /** Horizontal offset from container edge to first cell */\n  readonly offsetX: number;\n  /** Vertical offset from container edge to first cell */\n  readonly offsetY: number;\n  /** Horizontal gap between cells */\n  readonly gapX: number;\n  /** Vertical gap between cells */\n  readonly gapY: number;\n  /** Number of columns */\n  readonly cols: number;\n  /** Total container width */\n  readonly containerWidth: number;\n}\n\n/**\n * Configuration for grid cell dimension calculation.\n */\nexport interface GridCellConfig {\n  /** Container width in pixels */\n  width: number;\n  /** Number of columns */\n  cols: number;\n  /** Row height in pixels */\n  rowHeight: number;\n  /** Margin between items [x, y] */\n  margin?: readonly [number, number];\n  /** Container padding [x, y], defaults to margin if not specified */\n  containerPadding?: readonly [number, number] | null;\n}\n\n/**\n * Calculate grid cell dimensions for rendering backgrounds or overlays.\n *\n * This function provides all the measurements needed to render a visual\n * grid background that aligns with the actual grid cells.\n *\n * @param config - Grid configuration\n * @returns Cell dimensions and offsets\n *\n * @example\n * ```tsx\n * import { calcGridCellDimensions } from 'react-grid-layout/core';\n *\n * const dims = calcGridCellDimensions({\n *   width: 1200,\n *   cols: 12,\n *   rowHeight: 30,\n *   margin: [10, 10],\n *   containerPadding: [10, 10]\n * });\n *\n * // dims.cellWidth = 88.33...\n * // dims.cellHeight = 30\n * // dims.offsetX = 10 (containerPadding[0])\n * // dims.offsetY = 10 (containerPadding[1])\n * // dims.gapX = 10 (margin[0])\n * // dims.gapY = 10 (margin[1])\n * ```\n */\nexport function calcGridCellDimensions(\n  config: GridCellConfig\n): GridCellDimensions {\n  const {\n    width,\n    cols,\n    rowHeight,\n    margin = [10, 10],\n    containerPadding\n  } = config;\n\n  // Container padding defaults to margin if not specified\n  const padding = containerPadding ?? margin;\n\n  // Calculate cell width: total width minus padding and gaps, divided by columns\n  // Formula: width = 2*padding + cols*cellWidth + (cols-1)*gap\n  // Solving for cellWidth: cellWidth = (width - 2*padding - (cols-1)*gap) / cols\n  const cellWidth = (width - padding[0] * 2 - margin[0] * (cols - 1)) / cols;\n  const cellHeight = rowHeight;\n\n  return {\n    cellWidth,\n    cellHeight,\n    offsetX: padding[0],\n    offsetY: padding[1],\n    gapX: margin[0],\n    gapY: margin[1],\n    cols,\n    containerWidth: width\n  };\n}\n","/**\n * Collision detection utilities for grid layouts.\n *\n * These functions determine if and where layout items overlap.\n */\n\nimport type { Layout, LayoutItem } from \"./types.js\";\n\n/**\n * Check if two layout items collide (overlap).\n *\n * Two items collide if their bounding boxes overlap and they are\n * not the same item.\n *\n * @param l1 - First layout item\n * @param l2 - Second layout item\n * @returns true if the items collide\n */\nexport function collides(l1: LayoutItem, l2: LayoutItem): boolean {\n  // Same element - can't collide with itself\n  if (l1.i === l2.i) return false;\n\n  // Check if bounding boxes don't overlap (any gap means no collision)\n  if (l1.x + l1.w <= l2.x) return false; // l1 is completely left of l2\n  if (l1.x >= l2.x + l2.w) return false; // l1 is completely right of l2\n  if (l1.y + l1.h <= l2.y) return false; // l1 is completely above l2\n  if (l1.y >= l2.y + l2.h) return false; // l1 is completely below l2\n\n  // Bounding boxes overlap\n  return true;\n}\n\n/**\n * Find the first item in the layout that collides with the given item.\n *\n * @param layout - Layout to search\n * @param layoutItem - Item to check for collisions\n * @returns The first colliding item, or undefined if none\n */\nexport function getFirstCollision(\n  layout: Layout,\n  layoutItem: LayoutItem\n): LayoutItem | undefined {\n  for (let i = 0; i < layout.length; i++) {\n    const item = layout[i];\n    if (item !== undefined && collides(item, layoutItem)) {\n      return item;\n    }\n  }\n  return undefined;\n}\n\n/**\n * Find all items in the layout that collide with the given item.\n *\n * @param layout - Layout to search\n * @param layoutItem - Item to check for collisions\n * @returns Array of all colliding items (may be empty)\n */\nexport function getAllCollisions(\n  layout: Layout,\n  layoutItem: LayoutItem\n): LayoutItem[] {\n  return layout.filter((l): l is LayoutItem => collides(l, layoutItem));\n}\n","/**\n * Sorting utilities for grid layouts.\n *\n * These functions sort layout items for compaction and iteration.\n */\n\nimport type { CompactType, Layout, LayoutItem } from \"./types.js\";\n\n/**\n * Sort layout items based on the compaction type.\n *\n * - Vertical compaction: sort by row (y) then column (x)\n * - Horizontal compaction: sort by column (x) then row (y)\n * - No compaction (null): return original order\n *\n * Does not modify the original layout.\n *\n * @param layout - Layout to sort\n * @param compactType - Type of compaction\n * @returns Sorted layout\n */\nexport function sortLayoutItems(\n  layout: Layout,\n  compactType: CompactType\n): LayoutItem[] {\n  if (compactType === \"horizontal\") {\n    return sortLayoutItemsByColRow(layout);\n  }\n  if (compactType === \"vertical\") {\n    return sortLayoutItemsByRowCol(layout);\n  }\n  if (compactType === \"wrap\") {\n    // Wrap mode uses row-col order (reading order: left-to-right, top-to-bottom)\n    return sortLayoutItemsByRowCol(layout);\n  }\n  // No compaction - return a copy to maintain immutability\n  return [...layout];\n}\n\n/**\n * Sort layout items by row ascending, then column ascending.\n *\n * Items are ordered from top-left to bottom-right, row by row.\n * This is the natural reading order for vertical compaction.\n *\n * Does not modify the original layout.\n *\n * @param layout - Layout to sort\n * @returns Sorted array of layout items\n */\nexport function sortLayoutItemsByRowCol(layout: Layout): LayoutItem[] {\n  return [...layout].sort((a, b) => {\n    // Primary sort by row (y)\n    if (a.y !== b.y) {\n      return a.y - b.y;\n    }\n    // Secondary sort by column (x)\n    return a.x - b.x;\n  });\n}\n\n/**\n * Sort layout items by column ascending, then row ascending.\n *\n * Items are ordered from top-left to bottom-right, column by column.\n * This is the natural order for horizontal compaction.\n *\n * Does not modify the original layout.\n *\n * @param layout - Layout to sort\n * @returns Sorted array of layout items\n */\nexport function sortLayoutItemsByColRow(layout: Layout): LayoutItem[] {\n  return [...layout].sort((a, b) => {\n    // Primary sort by column (x)\n    if (a.x !== b.x) {\n      return a.x - b.x;\n    }\n    // Secondary sort by row (y)\n    return a.y - b.y;\n  });\n}\n","/**\n * Core layout manipulation utilities.\n *\n * These functions create, modify, and query grid layouts.\n * All functions treat layouts as immutable - they return new arrays/objects.\n */\n\nimport type { CompactType, Layout, LayoutItem, Mutable } from \"./types.js\";\nimport { getAllCollisions, getFirstCollision } from \"./collision.js\";\nimport { sortLayoutItems } from \"./sort.js\";\n\n// ============================================================================\n// Layout Queries\n// ============================================================================\n\n/**\n * Get the bottom-most Y coordinate of the layout.\n *\n * This is the Y position plus height of the lowest item.\n *\n * @param layout - Layout to measure\n * @returns The bottom Y coordinate (0 if layout is empty)\n */\nexport function bottom(layout: Layout): number {\n  let max = 0;\n  for (let i = 0; i < layout.length; i++) {\n    const item = layout[i];\n    if (item !== undefined) {\n      const bottomY = item.y + item.h;\n      if (bottomY > max) max = bottomY;\n    }\n  }\n  return max;\n}\n\n/**\n * Get a layout item by its ID.\n *\n * @param layout - Layout to search\n * @param id - Item ID to find\n * @returns The layout item, or undefined if not found\n */\nexport function getLayoutItem(\n  layout: Layout,\n  id: string\n): LayoutItem | undefined {\n  for (let i = 0; i < layout.length; i++) {\n    const item = layout[i];\n    if (item !== undefined && item.i === id) {\n      return item;\n    }\n  }\n  return undefined;\n}\n\n/**\n * Get all static items from the layout.\n *\n * Static items cannot be moved or resized by the user.\n *\n * @param layout - Layout to filter\n * @returns Array of static layout items\n */\nexport function getStatics(layout: Layout): LayoutItem[] {\n  return layout.filter((l): l is LayoutItem => l.static === true);\n}\n\n// ============================================================================\n// Layout Cloning\n// ============================================================================\n\n/**\n * Clone a layout item.\n *\n * Creates a shallow copy with all properties preserved.\n * Boolean properties are normalized (undefined becomes false).\n *\n * @param layoutItem - Item to clone\n * @returns A new layout item with the same properties\n */\nexport function cloneLayoutItem(layoutItem: LayoutItem): LayoutItem {\n  return {\n    i: layoutItem.i,\n    x: layoutItem.x,\n    y: layoutItem.y,\n    w: layoutItem.w,\n    h: layoutItem.h,\n    minW: layoutItem.minW,\n    maxW: layoutItem.maxW,\n    minH: layoutItem.minH,\n    maxH: layoutItem.maxH,\n    moved: Boolean(layoutItem.moved),\n    static: Boolean(layoutItem.static),\n    isDraggable: layoutItem.isDraggable,\n    isResizable: layoutItem.isResizable,\n    resizeHandles: layoutItem.resizeHandles,\n    constraints: layoutItem.constraints,\n    isBounded: layoutItem.isBounded\n  };\n}\n\n/**\n * Clone an entire layout.\n *\n * Creates a new array with cloned items.\n *\n * @param layout - Layout to clone\n * @returns A new layout with cloned items\n */\nexport function cloneLayout(layout: Layout): LayoutItem[] {\n  const newLayout: LayoutItem[] = new Array(layout.length);\n  for (let i = 0; i < layout.length; i++) {\n    const item = layout[i];\n    if (item !== undefined) {\n      newLayout[i] = cloneLayoutItem(item);\n    }\n  }\n  return newLayout;\n}\n\n// ============================================================================\n// Layout Modification\n// ============================================================================\n\n/**\n * Replace a layout item in a layout.\n *\n * Returns a new layout with the item replaced. Other items are not cloned.\n *\n * @param layout - Layout to modify\n * @param layoutItem - New item (matched by `i` property)\n * @returns New layout with the item replaced\n */\nexport function modifyLayout(\n  layout: Layout,\n  layoutItem: LayoutItem\n): LayoutItem[] {\n  const newLayout: LayoutItem[] = new Array(layout.length);\n  for (let i = 0; i < layout.length; i++) {\n    const item = layout[i];\n    if (item !== undefined) {\n      if (layoutItem.i === item.i) {\n        newLayout[i] = layoutItem;\n      } else {\n        newLayout[i] = item;\n      }\n    }\n  }\n  return newLayout;\n}\n\n/**\n * Apply a transformation to a layout item.\n *\n * Finds the item by key, clones it, applies the callback, and returns\n * a new layout with the modified item.\n *\n * @param layout - Layout to modify\n * @param itemKey - Key of the item to modify\n * @param cb - Callback that receives the cloned item and returns the modified item\n * @returns Tuple of [new layout, modified item or null if not found]\n */\nexport function withLayoutItem(\n  layout: Layout,\n  itemKey: string,\n  cb: (item: LayoutItem) => LayoutItem\n): [LayoutItem[], LayoutItem | null] {\n  let item = getLayoutItem(layout, itemKey);\n  if (!item) {\n    return [[...layout], null];\n  }\n\n  // Clone, then modify via callback\n  item = cb(cloneLayoutItem(item));\n  const newLayout = modifyLayout(layout, item);\n\n  return [newLayout, item];\n}\n\n// ============================================================================\n// Bounds Correction\n// ============================================================================\n\n/**\n * Ensure all layout items fit within the grid bounds.\n *\n * - Items overflowing right are moved left\n * - Items overflowing left are moved to x=0 and clamped to grid width\n * - Static items that collide with other statics are moved down\n *\n * **IMPORTANT**: This function mutates the layout items in place for performance.\n * The type signature uses `Mutable<LayoutItem>[]` to make this explicit.\n * Clone the layout first (e.g., with `cloneLayout()`) if you need immutability.\n *\n * @param layout - Layout to correct (items WILL be mutated)\n * @param bounds - Grid bounds\n * @returns The same layout array (for chaining)\n */\nexport function correctBounds(\n  layout: Mutable<LayoutItem>[],\n  bounds: { cols: number }\n): LayoutItem[] {\n  const collidesWith = getStatics(layout);\n\n  for (let i = 0; i < layout.length; i++) {\n    const l = layout[i];\n    if (l === undefined) continue;\n\n    // Overflows right\n    if (l.x + l.w > bounds.cols) {\n      l.x = bounds.cols - l.w;\n    }\n\n    // Overflows left\n    if (l.x < 0) {\n      l.x = 0;\n      l.w = bounds.cols;\n    }\n\n    if (!l.static) {\n      collidesWith.push(l);\n    } else {\n      // Static items that collide with other statics must be moved down\n      while (getFirstCollision(collidesWith, l)) {\n        l.y++;\n      }\n    }\n  }\n\n  return layout;\n}\n\n// ============================================================================\n// Move Operations\n// ============================================================================\n\n/**\n * Move a layout element to a new position.\n *\n * Handles collision detection and cascading movements.\n * Does not compact the layout - call `compact()` separately.\n *\n * **Note**: This function mutates the `l` parameter directly for performance.\n * The item's x, y, and moved properties will be modified. Callers should\n * ideally pass a cloned item if they need to preserve the original.\n *\n * @param layout - Full layout\n * @param l - Item to move (will be mutated)\n * @param x - New X position (or undefined to keep current)\n * @param y - New Y position (or undefined to keep current)\n * @param isUserAction - True if this is a direct user action (affects collision resolution)\n * @param preventCollision - True to block movement into occupied space (item snaps back). No effect if allowOverlap is true.\n * @param compactType - Compaction type for collision resolution\n * @param cols - Number of columns in the grid\n * @param allowOverlap - True to allow items to stack on top of each other\n * @returns The updated layout\n */\nexport function moveElement(\n  layout: Layout,\n  l: LayoutItem,\n  x: number | undefined,\n  y: number | undefined,\n  isUserAction: boolean | undefined,\n  preventCollision: boolean | undefined,\n  compactType: CompactType,\n  cols: number,\n  allowOverlap?: boolean\n): LayoutItem[] {\n  // Static items can't be moved unless explicitly draggable\n  if (l.static && l.isDraggable !== true) {\n    return [...layout];\n  }\n\n  // Short-circuit if position unchanged\n  if (l.y === y && l.x === x) {\n    return [...layout];\n  }\n\n  const oldX = l.x;\n  const oldY = l.y;\n\n  // Update position (mutates l directly - see JSDoc note)\n  if (typeof x === \"number\") (l as Mutable<LayoutItem>).x = x;\n  if (typeof y === \"number\") (l as Mutable<LayoutItem>).y = y;\n  (l as Mutable<LayoutItem>).moved = true;\n\n  // Sort for proper collision detection order\n  let sorted = sortLayoutItems(layout, compactType);\n  const movingUp =\n    compactType === \"vertical\" && typeof y === \"number\"\n      ? oldY >= y\n      : compactType === \"horizontal\" && typeof x === \"number\"\n        ? oldX >= x\n        : false;\n\n  if (movingUp) {\n    sorted = sorted.reverse();\n  }\n\n  const collisions = getAllCollisions(sorted, l);\n  const hasCollisions = collisions.length > 0;\n\n  // Handle overlap mode - just clone and return\n  if (hasCollisions && allowOverlap) {\n    return cloneLayout(layout);\n  }\n\n  // Handle prevent collision mode - revert position\n  // Return same reference to signal no change occurred\n  if (hasCollisions && preventCollision) {\n    (l as Mutable<LayoutItem>).x = oldX;\n    (l as Mutable<LayoutItem>).y = oldY;\n    (l as Mutable<LayoutItem>).moved = false;\n    return layout as LayoutItem[];\n  }\n\n  // Resolve collisions by moving other items\n  let resultLayout: LayoutItem[] = [...layout];\n  for (let i = 0; i < collisions.length; i++) {\n    const collision = collisions[i];\n    if (collision === undefined) continue;\n\n    // Skip already-moved items to prevent infinite loops\n    if (collision.moved) continue;\n\n    // Static items can't be moved - move the dragged item instead\n    if (collision.static) {\n      resultLayout = moveElementAwayFromCollision(\n        resultLayout,\n        collision,\n        l,\n        isUserAction,\n        compactType,\n        cols\n      );\n    } else {\n      resultLayout = moveElementAwayFromCollision(\n        resultLayout,\n        l,\n        collision,\n        isUserAction,\n        compactType,\n        cols\n      );\n    }\n  }\n\n  return resultLayout;\n}\n\n/**\n * Move an item away from a collision.\n *\n * Attempts to move the item up/left first if there's room,\n * otherwise moves it down/right.\n *\n * @param layout - Full layout\n * @param collidesWith - The item being collided with\n * @param itemToMove - The item to move away\n * @param isUserAction - True if this is a direct user action\n * @param compactType - Compaction type\n * @param cols - Number of columns\n * @returns Updated layout\n */\nexport function moveElementAwayFromCollision(\n  layout: Layout,\n  collidesWith: LayoutItem,\n  itemToMove: LayoutItem,\n  isUserAction: boolean | undefined,\n  compactType: CompactType,\n  cols: number\n): LayoutItem[] {\n  const compactH = compactType === \"horizontal\";\n  const compactV = compactType === \"vertical\";\n  const preventCollision = collidesWith.static;\n\n  // Try to move up/left first (only on primary collision from user action)\n  if (isUserAction) {\n    isUserAction = false; // Only try this once\n\n    // Create a fake item to test if there's room above/left\n    const fakeItem: LayoutItem = {\n      x: compactH ? Math.max(collidesWith.x - itemToMove.w, 0) : itemToMove.x,\n      y: compactV ? Math.max(collidesWith.y - itemToMove.h, 0) : itemToMove.y,\n      w: itemToMove.w,\n      h: itemToMove.h,\n      i: \"-1\"\n    };\n\n    const firstCollision = getFirstCollision(layout, fakeItem);\n    const collisionNorth =\n      firstCollision !== undefined &&\n      firstCollision.y + firstCollision.h > collidesWith.y;\n    const collisionWest =\n      firstCollision !== undefined &&\n      collidesWith.x + collidesWith.w > firstCollision.x;\n\n    // No collision above/left - we can move there\n    if (!firstCollision) {\n      return moveElement(\n        layout,\n        itemToMove,\n        compactH ? fakeItem.x : undefined,\n        compactV ? fakeItem.y : undefined,\n        isUserAction,\n        preventCollision,\n        compactType,\n        cols\n      );\n    }\n\n    // Handle specific collision cases\n    if (collisionNorth && compactV) {\n      return moveElement(\n        layout,\n        itemToMove,\n        undefined,\n        itemToMove.y + 1,\n        isUserAction,\n        preventCollision,\n        compactType,\n        cols\n      );\n    }\n\n    if (collisionNorth && compactType === null) {\n      // Swap positions in free-form mode\n      (collidesWith as Mutable<LayoutItem>).y = itemToMove.y;\n      (itemToMove as Mutable<LayoutItem>).y = itemToMove.y + itemToMove.h;\n      return [...layout];\n    }\n\n    if (collisionWest && compactH) {\n      return moveElement(\n        layout,\n        collidesWith,\n        itemToMove.x,\n        undefined,\n        isUserAction,\n        preventCollision,\n        compactType,\n        cols\n      );\n    }\n  }\n\n  // Default: move down/right by 1\n  const newX = compactH ? itemToMove.x + 1 : undefined;\n  const newY = compactV ? itemToMove.y + 1 : undefined;\n\n  if (newX === undefined && newY === undefined) {\n    return [...layout];\n  }\n\n  return moveElement(\n    layout,\n    itemToMove,\n    newX,\n    newY,\n    isUserAction,\n    preventCollision,\n    compactType,\n    cols\n  );\n}\n\n// ============================================================================\n// Validation\n// ============================================================================\n\n/**\n * Validate that a layout has the required properties.\n *\n * @param layout - Layout to validate\n * @param contextName - Name for error messages\n * @throws Error if layout is invalid\n */\nexport function validateLayout(\n  layout: Layout,\n  contextName: string = \"Layout\"\n): void {\n  const requiredProps = [\"x\", \"y\", \"w\", \"h\"] as const;\n\n  if (!Array.isArray(layout)) {\n    throw new Error(`${contextName} must be an array!`);\n  }\n\n  for (let i = 0; i < layout.length; i++) {\n    const item = layout[i];\n    if (item === undefined) continue;\n\n    for (const key of requiredProps) {\n      const value = item[key];\n      if (typeof value !== \"number\" || Number.isNaN(value)) {\n        throw new Error(\n          `ReactGridLayout: ${contextName}[${i}].${key} must be a number! ` +\n            `Received: ${String(value)} (${typeof value})`\n        );\n      }\n    }\n\n    if (item.i !== undefined && typeof item.i !== \"string\") {\n      throw new Error(\n        `ReactGridLayout: ${contextName}[${i}].i must be a string! ` +\n          `Received: ${String(item.i)} (${typeof item.i})`\n      );\n    }\n  }\n}\n"]}