Export ContextualMenu component, with added `hasBackground` property

, which is only enabled when `createMenu` is used.

src/components/structures/ContextualMenu.js

@@ -40,7 +40,7 @@ function getOrCreateContainer() {
     return container;
 }
 
-class ContextualMenu extends React.Component {
+export default class ContextualMenu extends React.Component {
     propTypes: {
         top: PropTypes.number,
         bottom: PropTypes.number,
@@ -57,6 +57,10 @@ class ContextualMenu extends React.Component {
         menuPaddingRight: PropTypes.number,
         menuPaddingBottom: PropTypes.number,
         menuPaddingLeft: PropTypes.number,
+
+        // If true, insert an invisible screen-sized element behind the
+        // menu that when clicked will close it.
+        hasBackground: PropTypes.bool,
     }
 
     render() {
@@ -154,14 +158,13 @@ class ContextualMenu extends React.Component {
                 { chevron }
                 <ElementClass {...props} onFinished={props.closeMenu} onResize={props.windowResize} />
             </div>
-            <div className="mx_ContextualMenu_background" onClick={props.closeMenu}></div>
+            { props.hasBackground && <div className="mx_ContextualMenu_background" onClick={props.closeMenu}></div> }
             <style>{ chevronCSS }</style>
         </div>;
     }
 }
 
-module.exports = {
+export function createMenu(ElementClass, props) {
-    createMenu: function(ElementClass, props) {
     const closeMenu = function(...args) {
         ReactDOM.unmountComponentAtNode(getOrCreateContainer());
 
@@ -172,6 +175,7 @@ module.exports = {
 
     const menu = <ContextualMenu
         {...props}
+        hasBackground={true}
         elementClass={ElementClass}
         closeMenu={closeMenu}
         windowResize={closeMenu}
@@ -180,5 +184,4 @@ module.exports = {
     ReactDOM.render(menu, getOrCreateContainer());
 
     return {close: closeMenu};
-    },
+}
-};