optimizely-oui/module/js/components/Sortable/SortDragLayer/index.js

Optimizely's Component Library.

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import Immutable from "immutable";
import PropTypes from "prop-types";
import React from "react";
import { DragLayer } from "react-dnd";
import SortableGroup from "../SortableGroup";
import SortableItem from "../SortableItem";
/**
 * getItemStyles
 * @description Calculates the CSS X and Y offsets applied to the drag layer
 * @param {Object} initialOffset X and Y coordinates when dragging began
 * @param {Object} currentOffset X and Y coordinates of drag layer now
 * @returns {Object} React CSS object containing X/Y offset style
 */

function getItemStyles(initialOffset, currentOffset) {
  if (!initialOffset || !currentOffset) {
    return {
      display: "none"
    };
  }

  var x = initialOffset.x;
  var y = currentOffset.y;
  var transform = "translate(".concat(x, "px, ").concat(y, "px)");
  return {
    transform: transform
  };
}
/**
 * onMoveStub
 * @description No-op function to pass to item preview in drag layer
 */


var onMoveStub = function onMoveStub() {
  return null;
};
/**
 * endDragStub
 * @description No-op function to pass to item preview in drag layer
 */


var endDragStub = function endDragStub() {
  return null;
};

var SortDragLayer =
/*#__PURE__*/
function (_React$Component) {
  _inherits(SortDragLayer, _React$Component);

  function SortDragLayer() {
    _classCallCheck(this, SortDragLayer);

    return _possibleConstructorReturn(this, _getPrototypeOf(SortDragLayer).apply(this, arguments));
  }

  _createClass(SortDragLayer, [{
    key: "shouldComponentUpdate",
    value: function shouldComponentUpdate(nextProps) {
      var _this$props = this.props,
          currentOffset = _this$props.currentOffset,
          isDragging = _this$props.isDragging;
      var hasNewOffset = (currentOffset && currentOffset.y) !== (nextProps.currentOffset && nextProps.currentOffset.y);
      var changedDraggingState = isDragging !== nextProps.isDragging;
      return hasNewOffset || changedDraggingState;
    }
  }, {
    key: "render",
    value: function render() {
      var _this$props2 = this.props,
          baseTestSection = _this$props2.baseTestSection,
          currentOffset = _this$props2.currentOffset,
          initialOffset = _this$props2.initialOffset,
          isDragging = _this$props2.isDragging,
          item = _this$props2.item,
          renderItem = _this$props2.renderItem;
      return !!item && isDragging && React.createElement("div", {
        className: "oui-sortable__drag-preview cursor--move height--1-1 width--1-1 pointer-events--none position--fixed",
        "data-test-section": "".concat(baseTestSection, "-drag-layer")
      }, React.createElement("ul", {
        className: "oui-sortable__drag-preview__item",
        style: getItemStyles(initialOffset, currentOffset)
      }, item.type === "item" && React.createElement(SortableItem, {
        baseTestSection: baseTestSection,
        endDrag: endDragStub,
        id: item.id,
        isDragPreview: true,
        item: item.data,
        key: item.id,
        onMove: onMoveStub,
        position: item.position,
        render: renderItem
      }), item.type === "group" && React.createElement(SortableGroup, {
        baseTestSection: baseTestSection,
        endDrag: endDragStub,
        id: item.id,
        isDragPreview: true,
        items: item.data,
        key: item.id,
        onMove: onMoveStub,
        position: item.position,
        renderItem: renderItem
      })));
    }
  }]);

  return SortDragLayer;
}(React.Component);

_defineProperty(SortDragLayer, "propTypes", {
  baseTestSection: PropTypes.string.isRequired,
  currentOffset: PropTypes.shape({
    x: PropTypes.number.isRequired,
    y: PropTypes.number.isRequired
  }),
  initialOffset: PropTypes.shape({
    x: PropTypes.number.isRequired,
    y: PropTypes.number.isRequired
  }),
  isDragging: PropTypes.bool.isRequired,
  item: PropTypes.shape({
    data: PropTypes.oneOfType([PropTypes.instanceOf(Immutable.Map), PropTypes.instanceOf(Immutable.List)]).isRequired,
    id: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
    position: PropTypes.arrayOf(PropTypes.number).isRequired,
    type: PropTypes.string
  }),
  renderItem: PropTypes.func.isRequired
});

_defineProperty(SortDragLayer, "defaultProps", {
  item: null
});

export default DragLayer(function (monitor) {
  return {
    currentOffset: monitor.getSourceClientOffset(),
    initialOffset: monitor.getInitialSourceClientOffset(),
    item: monitor.getItem(),
    itemType: monitor.getItemType(),
    isDragging: monitor.isDragging()
  };
})(SortDragLayer);