Liferay.Loader.define("layout-content-page-editor-web@2.0.136/page_editor/core/createDNDBackend", ['module', 'exports', 'require', 'frontend-js-react-web$react-dnd-html5-backend'], function (module, exports, require) {
  var define = undefined;
  var global = window;
  {
    Object.defineProperty(exports, "__esModule", {
      value: true
    });
    exports.default = createDNDBackend;

    var _reactDndHtml5Backend = require("frontend-js-react-web$react-dnd-html5-backend");

    /**
     * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
     *
     * This library is free software; you can redistribute it and/or modify it under
     * the terms of the GNU Lesser General Public License as published by the Free
     * Software Foundation; either version 2.1 of the License, or (at your option)
     * any later version.
     *
     * This library is distributed in the hope that it will be useful, but WITHOUT
     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
     * details.
     */
    function createDNDBackend(manager, mainContext) {
      /**
       * @type {Set<Window>}
       */
      var contexts = new Set();
      /**
       * @type {Map<Window, {backend: object, nodes: Map<string, HTMLElement>}>}
       */

      var connections = new Map();

      var handleDragAndDropEvent = function handleDragAndDropEvent(methodName) {
        return function (itemId, node, options) {
          contexts.forEach(function (context) {
            if (context.document.body && context.document.body.contains(node)) {
              var connection = connections.get(context);

              if (connection.nodes.get(itemId) !== node) {
                connection.nodes.set(itemId, node);
                connection.backend[methodName](itemId, node, options);
              }
            }
          });
        };
      };

      return {
        connectDragPreview: handleDragAndDropEvent('connectDragPreview'),
        connectDragSource: handleDragAndDropEvent('connectDragSource'),
        connectDropTarget: handleDragAndDropEvent('connectDropTarget'),
        setup: function setup() {
          contexts.add(mainContext);
          Array.from(mainContext.document.querySelectorAll('iframe')).forEach(function (iframe) {
            if (iframe.contentWindow) {
              contexts.add(iframe.contentWindow);
            }
          });
          contexts.forEach(function (context) {
            if (!connections.has(context)) {
              var backend = (0, _reactDndHtml5Backend.HTML5Backend)(manager, context);
              backend.setup();
              connections.set(context, {
                backend: backend,
                nodes: new Map()
              });
            }
          });
        },
        teardown: function teardown() {
          contexts.forEach(function (context) {
            var connection = connections.get(context);

            if (connection) {
              connection.backend.teardown();
              connections.delete(context);
            }
          });
          contexts.clear();
        }
      };
    }
    //# sourceMappingURL=createDNDBackend.js.map
  }
});
//# sourceMappingURL=createDNDBackend.js.map