seahub/frontend/src/components/context-menu/actions.js

import assign from 'object-assign';

import { store } from './helpers';

export const MENU_SHOW = 'REACT_CONTEXTMENU_SHOW';
export const MENU_HIDE = 'REACT_CONTEXTMENU_HIDE';


export function dispatchGlobalEvent(eventName, opts, target = window) {
	// Compatibale with IE
  // @see http://stackoverflow.com/questions/26596123/internet-explorer-9-10-11-event-constructor-doesnt-work
  let event;

  if (typeof window.CustomEvent === 'function') {
    event = new window.CustomEvent(eventName, { detail: opts });
  } else {
    event = document.createEvent('CustomEvent');
    event.initCustomEvent(eventName, false, true, opts);
  }

  if (target) {
    target.dispatchEvent(event);
    assign(store, opts);
  }
}

export function showMenu(opts = {}, target) {
  dispatchGlobalEvent(MENU_SHOW, assign({}, opts, { type: MENU_SHOW }), target);
}

export function hideMenu(opts = {}, target) {
  dispatchGlobalEvent(MENU_HIDE, assign({}, opts, { type: MENU_HIDE }), target);
}