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

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }

import { shallowEqual } from '@react-dnd/shallowequal';
import wrapConnectorHooks from './wrapConnectorHooks';
import { isRef } from '../utils/isRef';
export var TargetConnector =
/*#__PURE__*/
function () {
  function TargetConnector(backend) {
    var _this = this;

_classCallCheck(this, TargetConnector);

this.hooks = wrapConnectorHooks({
      dropTarget: function dropTarget(node, options) {
        _this.clearDropTarget();

_this.dropTargetOptions = options;

if (isRef(node)) {
          _this.dropTargetRef = node;
        } else {
          _this.dropTargetNode = node;
        }

_this.reconnect();
      }
    });
    this.handlerId = null; // The drop target may either be attached via ref or connect function

this.dropTargetRef = null;
    this.dropTargetOptionsInternal = null;
    this.lastConnectedHandlerId = null;
    this.lastConnectedDropTarget = null;
    this.lastConnectedDropTargetOptions = null;
    this.backend = backend;
  }

_createClass(TargetConnector, [{
    key: "reconnect",
    value: function reconnect() {
      // if nothing has changed then don't resubscribe
      var didChange = this.didHandlerIdChange() || this.didDropTargetChange() || this.didOptionsChange();

if (didChange) {
        this.disconnectDropTarget();
      }

var dropTarget = this.dropTarget;

if (!this.handlerId) {
        return;
      }

if (!dropTarget) {
        this.lastConnectedDropTarget = dropTarget;
        return;
      }

if (didChange) {
        this.lastConnectedHandlerId = this.handlerId;
        this.lastConnectedDropTarget = dropTarget;
        this.lastConnectedDropTargetOptions = this.dropTargetOptions;
        this.unsubscribeDropTarget = this.backend.connectDropTarget(this.handlerId, dropTarget, this.dropTargetOptions);
      }
    }
  }, {
    key: "receiveHandlerId",
    value: function receiveHandlerId(newHandlerId) {
      if (newHandlerId === this.handlerId) {
        return;
      }

this.handlerId = newHandlerId;
      this.reconnect();
    }
  }, {
    key: "didHandlerIdChange",
    value: function didHandlerIdChange() {
      return this.lastConnectedHandlerId !== this.handlerId;
    }
  }, {
    key: "didDropTargetChange",
    value: function didDropTargetChange() {
      return this.lastConnectedDropTarget !== this.dropTarget;
    }
  }, {
    key: "didOptionsChange",
    value: function didOptionsChange() {
      return !shallowEqual(this.lastConnectedDropTargetOptions, this.dropTargetOptions);
    }
  }, {
    key: "disconnectDropTarget",
    value: function disconnectDropTarget() {
      if (this.unsubscribeDropTarget) {
        this.unsubscribeDropTarget();
        this.unsubscribeDropTarget = undefined;
      }
    }
  }, {
    key: "clearDropTarget",
    value: function clearDropTarget() {
      this.dropTargetRef = null;
      this.dropTargetNode = null;
    }
  }, {
    key: "connectTarget",
    get: function get() {
      return this.dropTarget;
    }
  }, {
    key: "dropTargetOptions",
    get: function get() {
      return this.dropTargetOptionsInternal;
    },
    set: function set(options) {
      this.dropTargetOptionsInternal = options;
    }
  }, {
    key: "dropTarget",
    get: function get() {
      return this.dropTargetNode || this.dropTargetRef && this.dropTargetRef.current;
    }
  }]);

return TargetConnector;
}();