{"version":3,"file":"useDragAndDrop.mjs","sources":["../../../admin/src/hooks/useDragAndDrop.ts"],"sourcesContent":["import * as React from 'react';\n\nimport {\n  useDrag,\n  useDrop,\n  type HandlerManager,\n  type ConnectDragSource,\n  type ConnectDropTarget,\n  type ConnectDragPreview,\n  type DragSourceMonitor,\n} from 'react-dnd';\n\nimport {\n  useKeyboardDragAndDrop,\n  type UseKeyboardDragAndDropCallbacks,\n} from './useKeyboardDragAndDrop';\n\nimport type { Data } from '@strapi/types';\n\nconst DIRECTIONS = {\n  UPWARD: 'upward',\n  DOWNWARD: 'downward',\n} as const;\n\nconst DROP_SENSITIVITY = {\n  REGULAR: 'regular',\n  IMMEDIATE: 'immediate',\n} as const;\n\ninterface UseDragAndDropOptions<\n  TIndex extends number | Array<number> = number,\n  TItem extends { index: TIndex } = { index: TIndex },\n> extends UseKeyboardDragAndDropCallbacks<TIndex> {\n  type?: string;\n  index: TIndex;\n  item?: TItem;\n  onStart?: () => void;\n  onEnd?: () => void;\n  dropSensitivity?: (typeof DROP_SENSITIVITY)[keyof typeof DROP_SENSITIVITY];\n}\n\ntype Identifier = ReturnType<HandlerManager['getHandlerId']>;\n\ntype UseDragAndDropReturn<E extends Element = HTMLElement> = [\n  props: {\n    handlerId: Identifier;\n    isDragging: boolean;\n    handleKeyDown: <E extends Element>(event: React.KeyboardEvent<E>) => void;\n    isOverDropTarget: boolean;\n    direction: (typeof DIRECTIONS)[keyof typeof DIRECTIONS] | null;\n  },\n  objectRef: React.RefObject<E>,\n  dropRef: ConnectDropTarget,\n  dragRef: ConnectDragSource,\n  dragPreviewRef: ConnectDragPreview,\n];\n\ntype DropCollectedProps = {\n  handlerId: Identifier;\n  isOver: boolean;\n};\n\n/**\n * A utility hook abstracting the general drag and drop hooks from react-dnd.\n * Centralising the same behaviours and by default offering keyboard support.\n */\nconst useDragAndDrop = <\n  TIndex extends number | Array<number>,\n  TItem extends { index: TIndex; id?: Data.ID; [key: string]: unknown } = {\n    index: TIndex;\n    [key: string]: unknown;\n  },\n  E extends Element = HTMLElement,\n>(\n  active: boolean,\n  {\n    type = 'STRAPI_DND',\n    index,\n    item,\n    onStart,\n    onEnd,\n    onGrabItem,\n    onDropItem,\n    onCancel,\n    onMoveItem,\n    dropSensitivity = DROP_SENSITIVITY.REGULAR,\n  }: UseDragAndDropOptions<TIndex, TItem>\n): UseDragAndDropReturn<E> => {\n  const objectRef = React.useRef<E>(null);\n\n  const [{ handlerId, isOver }, dropRef] = useDrop<TItem, void, DropCollectedProps>({\n    accept: type,\n    collect(monitor) {\n      return {\n        handlerId: monitor.getHandlerId(),\n        isOver: monitor.isOver({ shallow: true }),\n      };\n    },\n    drop(item) {\n      const draggedIndex = item.index;\n      const newIndex = index;\n\n      if (isOver && onDropItem) {\n        onDropItem(draggedIndex, newIndex);\n      }\n    },\n    hover(item, monitor) {\n      if (!objectRef.current || !onMoveItem) {\n        return;\n      }\n\n      const dragIndex = item.index;\n      const newIndex = index;\n\n      const hoverBoundingRect = objectRef.current?.getBoundingClientRect();\n      const hoverMiddleY = (hoverBoundingRect.bottom - hoverBoundingRect.top) / 2;\n      const clientOffset = monitor.getClientOffset();\n      if (!clientOffset) return;\n\n      const hoverClientY = clientOffset && clientOffset.y - hoverBoundingRect.top;\n      if (typeof dragIndex === 'number' && typeof newIndex === 'number') {\n        if (dragIndex === newIndex) {\n          // Don't replace items with themselves\n          return;\n        }\n\n        if (dropSensitivity === DROP_SENSITIVITY.REGULAR) {\n          // Dragging downwards\n          if (dragIndex < newIndex && hoverClientY < hoverMiddleY) {\n            return;\n          }\n\n          // Dragging upwards\n          if (dragIndex > newIndex && hoverClientY > hoverMiddleY) {\n            return;\n          }\n        }\n\n        // Time to actually perform the action\n        onMoveItem(newIndex, dragIndex);\n        item.index = newIndex;\n      } else {\n        // Using numbers as indices doesn't work for nested list items with path like [1, 1, 0]\n        if (Array.isArray(dragIndex) && Array.isArray(newIndex)) {\n          // Indices comparison to find item position in nested list\n          const minLength = Math.min(dragIndex.length, newIndex.length);\n          let areEqual = true;\n          let isLessThan = false;\n          let isGreaterThan = false;\n\n          for (let i = 0; i < minLength; i++) {\n            if (dragIndex[i] < newIndex[i]) {\n              isLessThan = true;\n              areEqual = false;\n              break;\n            } else if (dragIndex[i] > newIndex[i]) {\n              isGreaterThan = true;\n              areEqual = false;\n              break;\n            }\n          }\n\n          // Don't replace items with themselves\n          if (areEqual && dragIndex.length === newIndex.length) {\n            return;\n          }\n\n          if (dropSensitivity === DROP_SENSITIVITY.REGULAR) {\n            // Dragging downwards\n            if (isLessThan && !isGreaterThan && hoverClientY < hoverMiddleY) {\n              return;\n            }\n\n            // Dragging upwards\n            if (isGreaterThan && !isLessThan && hoverClientY > hoverMiddleY) {\n              return;\n            }\n          }\n        }\n\n        onMoveItem(newIndex, dragIndex);\n        item.index = newIndex;\n      }\n    },\n  });\n\n  const getDragDirection = (monitor: DragSourceMonitor<TItem, void>) => {\n    if (\n      monitor &&\n      monitor.isDragging() &&\n      !monitor.didDrop() &&\n      monitor.getInitialClientOffset() &&\n      monitor.getClientOffset()\n    ) {\n      const deltaY = monitor.getInitialClientOffset()!.y - monitor.getClientOffset()!.y;\n\n      if (deltaY > 0) return DIRECTIONS.UPWARD;\n\n      if (deltaY < 0) return DIRECTIONS.DOWNWARD;\n\n      return null;\n    }\n\n    return null;\n  };\n\n  const [{ isDragging, direction }, dragRef, dragPreviewRef] = useDrag({\n    type,\n    item() {\n      if (onStart) {\n        onStart();\n      }\n\n      /**\n       * This will be attached and it helps define the preview sizes\n       * when a component is flexy e.g. Relations\n       */\n      const { width } = objectRef.current?.getBoundingClientRect() ?? {};\n\n      return { index, width, ...item };\n    },\n    end() {\n      if (onEnd) {\n        onEnd();\n      }\n    },\n    canDrag: active,\n    /**\n     * This is useful when the item is in a virtualized list.\n     * However, if we don't have an ID then we want the libraries\n     * defaults to take care of this.\n     */\n    isDragging: item?.id\n      ? (monitor) => {\n          return item.id === monitor.getItem().id;\n        }\n      : undefined,\n    collect: (monitor) => ({\n      isDragging: monitor.isDragging(),\n      initialOffset: monitor.getInitialClientOffset(),\n      currentOffset: monitor.getClientOffset(),\n      direction: getDragDirection(monitor),\n    }),\n  });\n\n  const handleKeyDown = useKeyboardDragAndDrop(active, index, {\n    onGrabItem,\n    onDropItem,\n    onCancel,\n    onMoveItem,\n  });\n\n  return [\n    { handlerId, isDragging, handleKeyDown, isOverDropTarget: isOver, direction },\n    objectRef,\n    dropRef,\n    dragRef,\n    dragPreviewRef,\n  ];\n};\n\nexport {\n  useDragAndDrop,\n  UseDragAndDropReturn,\n  UseDragAndDropOptions,\n  DIRECTIONS,\n  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