Re-modularised the context menus

src/components/structures/ContextualMenu.js

@@ -0,0 +1,84 @@
+/*
+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');
+var ReactDOM = require('react-dom');
+
+// Shamelessly ripped off Modal.js.  There's probably a better way
+// of doing reusable widgets like dialog boxes & menus where we go and
+// pass in a custom control as the actual body.
+
+module.exports = {
+    ContextualMenuContainerId: "mx_ContextualMenu_Container",
+
+    getOrCreateContainer: function() {
+        var container = document.getElementById(this.ContextualMenuContainerId);
+
+        if (!container) {
+            container = document.createElement("div");
+            container.id = this.ContextualMenuContainerId;
+            document.body.appendChild(container);
+        }
+
+        return container;
+    },
+
+    createMenu: function (Element, props) {
+        var self = this;
+
+        var closeMenu = function() {
+            ReactDOM.unmountComponentAtNode(self.getOrCreateContainer());
+
+            if (props && props.onFinished) {
+                props.onFinished.apply(null, arguments);
+            }
+        };
+
+        var position = {
+            top: props.top - 20,
+        };
+
+        var chevron = null;
+        if (props.left) {
+            chevron = <div className="mx_ContextualMenu_chevron_left"></div>
+            position.left = props.left + 8;
+        } else {
+            chevron = <div className="mx_ContextualMenu_chevron_right"></div>
+            position.right = props.right + 8;
+        }
+
+        var className = 'mx_ContextualMenu_wrapper';
+
+        // FIXME: If a menu uses getDefaultProps it clobbers the onFinished
+        // property set here so you can't close the menu from a button click!
+        var menu = (
+            <div className={className}>
+                <div className="mx_ContextualMenu" style={position}>
+                    {chevron}
+                    <Element {...props} onFinished={closeMenu}/>
+                </div>
+                <div className="mx_ContextualMenu_background" onClick={closeMenu}></div>
+            </div>
+        );
+
+        ReactDOM.render(menu, this.getOrCreateContainer());
+
+        return {close: closeMenu};
+    },
+};