move room/group panel header buttons into room/group header

src/components/views/right_panel/HeaderButtons.js

@@ -0,0 +1,65 @@
+/*
+Copyright 2015, 2016 OpenMarket Ltd
+Copyright 2017 Vector Creations Ltd
+Copyright 2017 New Vector Ltd
+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 dis from '../../../dispatcher';
+
+export default class HeaderButtons extends React.Component {
+
+    constructor(props, initialPhase) {
+        super(props);
+
+        this.state = {
+            phase: initialPhase,
+            isUserPrivilegedInGroup: null,
+        };
+        this.onAction = this.onAction.bind(this);
+    }
+
+    componentWillMount() {
+        this.dispatcherRef = dis.register(this.onAction);
+    }
+
+    componentWillUnmount() {
+        dis.unregister(this.dispatcherRef);
+    }
+
+    setPhase(phase, extras) {
+        // TODO: delay?
+        dis.dispatch(Object.assign({
+            action: 'view_right_panel_phase',
+            phase: phase,
+        }, extras));
+    }
+
+    onAction(payload) {
+        if (payload.action === "view_right_panel_phase") {
+            this.setState({
+                phase: payload.phase,
+            });
+        }
+    }
+
+    render() {
+        // inline style as this will be swapped around in future commits
+        return <div style={{display: 'flex'}}>
+            { this.renderButtons() }
+        </div>;
+    }
+}