rename TopLeftMenu to TopLeftMenuButton

so the former can be the actual menu

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 });
+    }
+}