Factor out a separate auxpanel, and cleanup the maxHeight management

Basically two changes here:

1. Factor out auxpanel from RoomView
2. Rather than setting maxHeight attributes by poking directly into the DOM,
pass them down as properties.

src/components/views/rooms/AuxPanel.js

@@ -0,0 +1,104 @@
+/*
+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.
+*/
+
+var React = require('react');
+var MatrixClientPeg = require("../../../MatrixClientPeg");
+var sdk = require('../../../index');
+var dis = require("../../../dispatcher");
+
+module.exports = React.createClass({
+    displayName: 'AuxPanel',
+
+    propTypes: {
+        // js-sdk room object
+        room: React.PropTypes.object.isRequired,
+
+        // Conference Handler implementation
+        conferenceHandler: React.PropTypes.object,
+
+        // set to true to show the file drop target
+        draggingFile: React.PropTypes.bool,
+
+        // set to true to show the 'active conf call' banner
+        displayConfCallNotification: React.PropTypes.bool,
+
+        // maxHeight attribute for the aux panel and the video
+        // therein
+        maxHeight: React.PropTypes.number,
+
+        // a callback which is called when the video element in a voip call is
+        // resized due to a change in video metadata
+        onCallViewVideoResize: React.PropTypes.func,
+    },
+
+    onConferenceNotificationClick: function() {
+        dis.dispatch({
+            action: 'place_call',
+            type: "video",
+            room_id: this.props.room.roomId,
+        });
+    },
+
+    render: function() {
+        var CallView = sdk.getComponent("voip.CallView");
+        var TintableSvg = sdk.getComponent("elements.TintableSvg");
+
+        var fileDropTarget = null;
+        if (this.props.draggingFile) {
+            fileDropTarget = (
+                <div className="mx_RoomView_fileDropTarget">
+                    <div className="mx_RoomView_fileDropTargetLabel"
+                      title="Drop File Here">
+                        <TintableSvg src="img/upload-big.svg" width="45" height="59"/>
+                        <br/>
+                        Drop file here to upload
+                    </div>
+                </div>
+            );
+        }
+
+        var conferenceCallNotification = null;
+        if (this.props.displayConfCallNotification) {
+            var supportedText;
+            if (!MatrixClientPeg.get().supportsVoip()) {
+                supportedText = " (unsupported)";
+            }
+            conferenceCallNotification = (
+                <div className="mx_RoomView_ongoingConfCallNotification"
+                        onClick={this.onConferenceNotificationClick}>
+                    Ongoing conference call {supportedText}
+                </div>
+            );
+        }
+
+        var callView = (
+            <CallView ref="callView" room={this.props.room}
+                ConferenceHandler={this.props.conferenceHandler}
+                onResize={this.props.onCallViewVideoResize}
+                maxVideoHeight={this.props.maxHeight}
+            />
+        );
+
+        return (
+            <div className="mx_RoomView_auxPanel" style={{maxHeight: this.props.maxHeight}} >
+                { fileDropTarget }
+                { callView }
+                { conferenceCallNotification }
+                { this.props.children }
+            </div>
+        );
+    },
+});