box-ui-elements-mlh/es/elements/common/droppable/makeDroppable.js

Box UI Elements

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/**
 * 
 * @file HOC for drag drop
 * @author Box
 */
import React, { PureComponent } from 'react';
import { findDOMNode } from 'react-dom';
import classNames from 'classnames';

/* eslint-disable no-plusplus */
var makeDroppable = function makeDroppable(_ref) {
  var dropValidator = _ref.dropValidator,
      onDrop = _ref.onDrop;
  return function (Wrapped) {
    var _class, _temp;

    return _temp = _class = /*#__PURE__*/function (_PureComponent) {
      _inherits(DroppableComponent, _PureComponent);

      var _super = _createSuper(DroppableComponent);

      /**
       * [constructor]
       *
       * @param {*} props
       * @return {DroppableComponent}
       */
      function DroppableComponent(props) {
        var _this;

        _classCallCheck(this, DroppableComponent);

        _this = _super.call(this, props);

        _defineProperty(_assertThisInitialized(_this), "removeEventListeners", function (element) {
          element.removeEventListener('dragenter', _this.handleDragEnter);
          element.removeEventListener('dragover', _this.handleDragOver);
          element.removeEventListener('dragleave', _this.handleDragLeave);
          element.removeEventListener('drop', _this.handleDrop);
        });

        _defineProperty(_assertThisInitialized(_this), "bindDragDropHandlers", function () {
          var droppableEl = findDOMNode(_assertThisInitialized(_this)); // eslint-disable-line react/no-find-dom-node

          if (!droppableEl || !(droppableEl instanceof Element)) {
            return;
          } // add event listeners directly on the element


          droppableEl.addEventListener('dragenter', _this.handleDragEnter);
          droppableEl.addEventListener('dragover', _this.handleDragOver);
          droppableEl.addEventListener('dragleave', _this.handleDragLeave);
          droppableEl.addEventListener('drop', _this.handleDrop);
          _this.droppableEl = droppableEl;
        });

        _defineProperty(_assertThisInitialized(_this), "handleDragEnter", function (event) {
          // This allows onDrop to be fired
          event.preventDefault(); // Use this to track the number of drag enters and leaves.
          // This is used to normalize enters/leaves between parent/child elements
          // we only want to do things in dragenter when the counter === 1

          if (++_this.enterLeaveCounter === 1) {
            var dataTransfer = event.dataTransfer; // if we don't have a dropValidator, we just default canDrop to true

            var canDrop = dropValidator ? dropValidator(_this.props, dataTransfer) : true;

            _this.setState({
              isOver: true,
              canDrop: canDrop
            });
          }
        });

        _defineProperty(_assertThisInitialized(_this), "handleDragOver", function (event) {
          // This allows onDrop to be fired
          event.preventDefault();
          var canDrop = _this.state.canDrop;
          var dataTransfer = event.dataTransfer;

          if (!dataTransfer) {
            return;
          }

          if (!canDrop) {
            dataTransfer.dropEffect = 'none';
          } else if (dataTransfer.effectAllowed) {
            // Set the drop effect if it was defined
            dataTransfer.dropEffect = dataTransfer.effectAllowed;
          }
        });

        _defineProperty(_assertThisInitialized(_this), "handleDrop", function (event) {
          event.preventDefault(); // reset enterLeaveCounter

          _this.enterLeaveCounter = 0;
          var canDrop = _this.state.canDrop;

          _this.setState({
            canDrop: false,
            isDragging: false,
            isOver: false
          });

          if (canDrop && onDrop) {
            onDrop(event, _this.props);
          }
        });

        _defineProperty(_assertThisInitialized(_this), "handleDragLeave", function (event) {
          event.preventDefault(); // if enterLeaveCounter is zero, it means that we're actually leaving the item

          if (--_this.enterLeaveCounter > 0) {
            return;
          }

          _this.setState({
            canDrop: false,
            isDragging: false,
            isOver: false
          });
        });

        _this.enterLeaveCounter = 0;
        _this.state = {
          canDrop: false,
          isDragging: false,
          isOver: false
        };
        return _this;
      }
      /**
       * Adds event listeners once the component mounts
       * @inheritdoc
       */


      _createClass(DroppableComponent, [{
        key: "componentDidMount",
        value: function componentDidMount() {
          this.bindDragDropHandlers();
        }
      }, {
        key: "componentDidUpdate",
        value: function componentDidUpdate() {
          if (!this.droppableEl) {
            this.bindDragDropHandlers();
            return;
          } // eslint-disable-next-line react/no-find-dom-node


          if (findDOMNode(this) !== this.droppableEl) {
            this.removeEventListeners(this.droppableEl);
            this.bindDragDropHandlers();
          }
        }
        /**
         * Function that removes the drag and drop related event listeners on the input element
         *
         * @param {Element} element
         * @return {void}
         */

      }, {
        key: "componentWillUnmount",
        value:
        /**
         * Removes event listeners when the component is going to unmount
         * @inheritdoc
         */
        function componentWillUnmount() {
          if (!this.droppableEl || !(this.droppableEl instanceof Element)) {
            return;
          }

          this.removeEventListeners(this.droppableEl);
        }
        /**
         * Function that gets called when an item is dragged into the drop zone
         *
         * @param {SyntheticEvent} event - The dragenter event
         * @return {void}
         */

      }, {
        key: "render",
        value:
        /**
         * Renders the HOC
         *
         * @private
         * @inheritdoc
         * @return {Element}
         */
        function render() {
          var _this$props = this.props,
              className = _this$props.className,
              rest = _objectWithoutProperties(_this$props, ["className"]);

          var _this$state = this.state,
              canDrop = _this$state.canDrop,
              isOver = _this$state.isOver;
          var classes = classNames(className, {
            'is-droppable': canDrop,
            'is-over': isOver
          });

          var mergedProps = _objectSpread(_objectSpread(_objectSpread({}, rest), this.state), {}, {
            className: classes
          });

          return /*#__PURE__*/React.createElement(Wrapped, mergedProps);
        }
      }]);

      return DroppableComponent;
    }(PureComponent), _defineProperty(_class, "defaultProps", {
      className: ''
    }), _temp;
  };
};

export default makeDroppable;
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