react-grid-layout/dist/chunk-2KUHNJXF.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  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 * 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// 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"]}