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Viewing file:     beginDrag.js (2.91 KB)      -rw-r--r--

import { invariant } from '@react-dnd/invariant';
import { setClientOffset } from './local/setClientOffset';
import { isObject } from '../../utils/js_utils';
import { BEGIN_DRAG, INIT_COORDS } from './types';
var ResetCoordinatesAction = {
  type: INIT_COORDS,
  payload: {
    clientOffset: null,
    sourceClientOffset: null
  }
};
export default function createBeginDrag(manager) {
  return function beginDrag() {
    var sourceIds = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : [];
    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {
      publishSource: true
    };
    var _options$publishSourc = options.publishSource,
        publishSource = _options$publishSourc === void 0 ? true : _options$publishSourc,
        clientOffset = options.clientOffset,
        getSourceClientOffset = options.getSourceClientOffset;
    var monitor = manager.getMonitor();
    var registry = manager.getRegistry(); // Initialize the coordinates using the client offset

    manager.dispatch(setClientOffset(clientOffset));
    verifyInvariants(sourceIds, monitor, registry); // Get the draggable source

    var sourceId = getDraggableSource(sourceIds, monitor);

    if (sourceId === null) {
      manager.dispatch(ResetCoordinatesAction);
      return;
    } // Get the source client offset


    var sourceClientOffset = null;

    if (clientOffset) {
      verifyGetSourceClientOffsetIsFunction(getSourceClientOffset);
      sourceClientOffset = getSourceClientOffset(sourceId);
    } // Initialize the full coordinates


    manager.dispatch(setClientOffset(clientOffset, sourceClientOffset));
    var source = registry.getSource(sourceId);
    var item = source.beginDrag(monitor, sourceId);
    verifyItemIsObject(item);
    registry.pinSource(sourceId);
    var itemType = registry.getSourceType(sourceId);
    return {
      type: BEGIN_DRAG,
      payload: {
        itemType: itemType,
        item: item,
        sourceId: sourceId,
        clientOffset: clientOffset || null,
        sourceClientOffset: sourceClientOffset || null,
        isSourcePublic: !!publishSource
      }
    };
  };
}

function verifyInvariants(sourceIds, monitor, registry) {
  invariant(!monitor.isDragging(), 'Cannot call beginDrag while dragging.');
  sourceIds.forEach(function (sourceId) {
    invariant(registry.getSource(sourceId), 'Expected sourceIds to be registered.');
  });
}

function verifyGetSourceClientOffsetIsFunction(getSourceClientOffset) {
  invariant(typeof getSourceClientOffset === 'function', 'When clientOffset is provided, getSourceClientOffset must be a function.');
}

function verifyItemIsObject(item) {
  invariant(isObject(item), 'Item must be an object.');
}

function getDraggableSource(sourceIds, monitor) {
  var sourceId = null;

  for (var i = sourceIds.length - 1; i >= 0; i--) {
    if (monitor.canDragSource(sourceIds[i])) {
      sourceId = sourceIds[i];
      break;
    }
  }

  return sourceId;
}