rename TopLeftMenu to TopLeftMenuButton

so the former can be the actual menu

res/css/structures/_TopLeftMenuButton.scss

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-.mx_TopLeftMenu {
+.mx_TopLeftMenuButton {
     height: 52px;
     border-bottom: 1px solid $panel-divider-color;
     color: $topleftmenu-color;
@@ -22,20 +22,20 @@ limitations under the License.
     display: flex;
 }
 
-.mx_TopLeftMenu_avatar {
+.mx_TopLeftMenuButton_avatar {
     position: relative; // to get avatar in the right place
     margin-left: 15px;
     margin-right: 15px;
     margin-top: 14px;
 }
 
-.mx_TopLeftMenu_name {
+.mx_TopLeftMenuButton_name {
     margin-top: 15px;
-    margin-right: 9px;   
+    margin-right: 9px;
     font-size: 18px;
     font-weight: 600;
 }
 
-.mx_TopLeftMenu_chevron {
+.mx_TopLeftMenuButton_chevron {
     margin-top: 24px;
 }

src/components/structures/LeftPanel.js

@@ -178,11 +178,11 @@ var LeftPanel = React.createClass({
     render: function() {
         const RoomList = sdk.getComponent('rooms.RoomList');
         const TagPanel = sdk.getComponent('structures.TagPanel');
-        const TopLeftMenu = sdk.getComponent('structures.TopLeftMenu');
+        const TopLeftMenuButton = sdk.getComponent('structures.TopLeftMenuButton');
         const BottomLeftMenu = sdk.getComponent('structures.BottomLeftMenu');
         const CallPreview = sdk.getComponent('voip.CallPreview');
 
-        let topBox = <TopLeftMenu collapsed={ this.props.collapsed }/>;
+        let topBox = <TopLeftMenuButton collapsed={ this.props.collapsed }/>;
 /*
         if (this.context.matrixClient.isGuest()) {
             const LoginBox = sdk.getComponent('structures.LoginBox');

src/components/structures/TopLeftMenuButton.js

@@ -0,0 +1,77 @@
+/*
+Copyright 2018 New Vector Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React from 'react';
+import PropTypes from 'prop-types';
+import sdk from '../../index';
+import * as ContextualMenu from './ContextualMenu';
+import {TopLeftMenu} from './TopLeftMenu';
+
+export class TopLeftMenuButton extends React.Component {
+
+    static propTypes = {
+        collapsed: PropTypes.bool.isRequired,
+    };
+
+    static displayName = 'TopLeftMenuButton';
+
+    constructor() {
+        super();
+        this.state = {
+            menuDisplayed: false,
+        };
+    }
+
+    render() {
+        const BaseAvatar = sdk.getComponent('avatars.BaseAvatar');
+        const avatarHeight = 28;
+        const name = "My stuff";
+
+        return (
+            <div className="mx_TopLeftMenuButton">
+                <BaseAvatar
+                    className="mx_TopLeftMenuButton_avatar"
+                    name={name}
+                    width={avatarHeight}
+                    height={avatarHeight}
+                />
+                <div className="mx_TopLeftMenuButton_name" onClick={this.onToggleMenu}>
+                    { name }
+                </div>
+                <img className="mx_TopLeftMenuButton_chevron" src="img/topleft-chevron.svg" width="11" height="6" />
+            </div>
+        );
+    }
+
+    onToggleMenu(e) {
+        e.preventDefault();
+        e.stopPropagation();
+
+        const elementRect = e.target.parentElement.getBoundingClientRect();
+        const x = elementRect.left;
+        const y = elementRect.top + elementRect.height;
+
+        ContextualMenu.createMenu(TopLeftMenu, {
+            chevronFace: "none",
+            left: x,
+            top: y,
+            onFinished: () => {
+                this.setState({ menuDisplayed: false });
+            },
+        });
+        this.setState({ menuDisplayed: true });
+    }
+}