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编辑当前文件:/home/freeclou/app.optimyar.com/backend/node_modules/react-dnd/dist/esm/hooks/internal/drop.js

function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _nonIterableRest(); }

function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance"); }

function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }

import { useMemo } from 'react';
import { registerTarget } from '../../common/registration';
import { useDragDropManager } from './useDragDropManager';
import { TargetConnector } from '../../common/TargetConnector';
import { DropTargetMonitorImpl } from '../../common/DropTargetMonitorImpl';
import { useIsomorphicLayoutEffect } from './useIsomorphicLayoutEffect';
export function useDropTargetMonitor() {
  var manager = useDragDropManager();
  var monitor = useMemo(function () {
    return new DropTargetMonitorImpl(manager);
  }, [manager]);
  var connector = useMemo(function () {
    return new TargetConnector(manager.getBackend());
  }, [manager]);
  return [monitor, connector];
}
export function useDropHandler(spec, monitor, connector) {
  var manager = useDragDropManager();
  var handler = useMemo(function () {
    return {
      canDrop: function canDrop() {
        var canDrop = spec.current.canDrop;
        return canDrop ? canDrop(monitor.getItem(), monitor) : true;
      },
      hover: function hover() {
        var hover = spec.current.hover;

if (hover) {
          hover(monitor.getItem(), monitor);
        }
      },
      drop: function drop() {
        var drop = spec.current.drop;

if (drop) {
          return drop(monitor.getItem(), monitor);
        }
      }
    };
  }, [monitor]);
  useIsomorphicLayoutEffect(function registerHandler() {
    var _registerTarget = registerTarget(spec.current.accept, handler, manager),
        _registerTarget2 = _slicedToArray(_registerTarget, 2),
        handlerId = _registerTarget2[0],
        unregister = _registerTarget2[1];

monitor.receiveHandlerId(handlerId);
    connector.receiveHandlerId(handlerId);
    return unregister;
  }, [monitor, connector]);
}