@annotationhub/react-golden-layout/dist/esm/js_es6/utils/EventHub.js

A multi-screen javascript Layout manager https://golden-layout.com

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function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }

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function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }

function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }

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import EventEmitter from '../utils/EventEmitter';
import { ALL_EVENT } from '../utils/EventEmitter';
import { fnBind } from '../utils/utils';
import $ from 'jquery';
/**
 * An EventEmitter singleton that propagates events
 * across multiple windows. This is a little bit trickier since
 * windows are allowed to open childWindows in their own right
 *
 * This means that we deal with a tree of windows. Hence the rules for event propagation are:
 *
 * - Propagate events from this layout to both parents and children
 * - Propagate events from parent to this and children
 * - Propagate events from children to the other children (but not the emitting one) and the parent
 *
 * @constructor
 *
 * @param {lm.LayoutManager} layoutManager
 */

var EventHub = /*#__PURE__*/function (_EventEmitter) {
  _inherits(EventHub, _EventEmitter);

  var _super = _createSuper(EventHub);

  function EventHub(layoutManager) {
    var _this;

    _classCallCheck(this, EventHub);

    _this = _super.call(this);
    _this._layoutManager = layoutManager;
    _this._dontPropagateToParent = null;
    _this._childEventSource = null;

    _this.on(ALL_EVENT, fnBind(_this._onEventFromThis, _assertThisInitialized(_this)));

    _this._boundOnEventFromChild = fnBind(_this._onEventFromChild, _assertThisInitialized(_this));
    $(window).on('gl_child_event', _this._boundOnEventFromChild);
    return _this;
  }
  /**
   * Called on every event emitted on this eventHub, regardles of origin.
   *
   * @private
   *
   * @param {Mixed}
   *
   * @returns {void}
   */


  _createClass(EventHub, [{
    key: "_onEventFromThis",
    value: function _onEventFromThis() {
      var args = Array.prototype.slice.call(arguments);

      if (this._layoutManager.isSubWindow && args[0] !== this._dontPropagateToParent) {
        this._propagateToParent(args);
      }

      this._propagateToChildren(args); //Reset


      this._dontPropagateToParent = null;
      this._childEventSource = null;
    }
    /**
     * Called by the parent layout.
     *
     * @param   {Array} args Event name + arguments
     *
     * @returns {void}
     */

  }, {
    key: "_$onEventFromParent",
    value: function _$onEventFromParent(args) {
      this._dontPropagateToParent = args[0];
      this.emit.apply(this, args);
    }
    /**
     * Callback for child events raised on the window
     *
     * @param   {DOMEvent} event
     * @private
     *
     * @returns {void}
     */

  }, {
    key: "_onEventFromChild",
    value: function _onEventFromChild(event) {
      this._childEventSource = event.originalEvent.__gl;
      this.emit.apply(this, event.originalEvent.__glArgs);
    }
    /**
     * Propagates the event to the parent by emitting
     * it on the parent's DOM window
     *
     * @param   {Array} args Event name + arguments
     * @private
     *
     * @returns {void}
     */

  }, {
    key: "_propagateToParent",
    value: function _propagateToParent(args) {
      var event,
          eventName = 'gl_child_event';

      if (document.createEvent) {
        event = window.opener.document.createEvent('HTMLEvents');
        event.initEvent(eventName, true, true);
      } else {
        event = window.opener.document.createEventObject();
        event.eventType = eventName;
      }

      event.eventName = eventName;
      event.__glArgs = args;
      event.__gl = this._layoutManager;

      if (document.createEvent) {
        window.opener.dispatchEvent(event);
      } else {
        window.opener.fireEvent('on' + event.eventType, event);
      }
    }
    /**
     * Propagate events to children
     *
     * @param   {Array} args Event name + arguments
     * @private
     *
     * @returns {void}
     */

  }, {
    key: "_propagateToChildren",
    value: function _propagateToChildren(args) {
      var childGl, i;

      for (i = 0; i < this._layoutManager.openPopouts.length; i++) {
        childGl = this._layoutManager.openPopouts[i].getGlInstance();

        if (childGl && childGl !== this._childEventSource) {
          childGl.eventHub._$onEventFromParent(args);
        }
      }
    }
    /**
     * Destroys the EventHub
     *
     * @public
     * @returns {void}
     */

  }, {
    key: "destroy",
    value: function destroy() {
      $(window).off('gl_child_event', this._boundOnEventFromChild);
    }
  }]);

  return EventHub;
}(EventEmitter);

export { EventHub as default };