Add a RoomPreviewBar which asks if you'd like to join a peeked room

src/components/views/rooms/RoomPreviewBar.js

@@ -0,0 +1,56 @@
+/*
+Copyright 2015, 2016 OpenMarket 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.
+*/
+
+'use strict';
+
+var React = require('react');
+
+module.exports = React.createClass({
+    displayName: 'RoomPreviewBar',
+
+    propTypes: {
+        onJoinClick: React.PropTypes.func,
+        canJoin: React.PropTypes.bool
+    },
+
+    getDefaultProps: function() {
+        return {
+            onJoinClick: function() {},
+            canJoin: false
+        };
+    },
+
+    render: function() {
+        var joinBlock;
+
+        if (this.props.canJoin) {
+            joinBlock = (
+                <div className="mx_RoomPreviewBar_join_text">
+                Would you like to <a onClick={this.props.onJoinClick}>join</a> this room?
+                </div>
+            );
+        }
+
+        return (
+            <div className="mx_RoomPreviewBar">
+                <div className="mx_RoomPreviewBar_preview_text">
+                This is a preview of this room. Room interactions have been disabled.
+                </div>
+                {joinBlock}
+            </div>
+        );
+    }
+});