Add a basic modal dialog implementation

skins/base/css/common.css

@@ -33,3 +33,31 @@ h2 {
     margin-top: 16px;
     margin-bottom: 16px;
 }
+
+.mx_Dialog_Background {
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    background-color: #ccc;
+    opacity: 0.5;
+    z-index: -200;
+}
+
+.mx_Dialog_Wrapper {
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+}
+
+.mx_Dialog {
+    background-color: #fff;
+    margin: auto;
+    max-width: 500px;
+    z-index: -100;
+    position: relative;
+    top: 100px;
+}

src/Modal.js

@@ -0,0 +1,58 @@
+/*
+Copyright 2015 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 q = require('q');
+
+module.exports = {
+    DialogContainerId: "mx_Dialog_Container",
+
+    getOrCreateContainer: function() {
+        var container = document.getElementById(this.DialogContainerId);
+
+        if (!container) {
+            container = document.createElement("div");
+            container.id = this.DialogContainerId;
+            document.body.appendChild(container);
+        }
+
+        return container;
+    },
+
+    createDialog: function (Element, props) {
+        var self = this;
+
+        var closeDialog = function() {
+            React.unmountComponentAtNode(self.getOrCreateContainer());
+
+            if (props && props.onFinished) props.onFinished.apply(arguments);
+        };
+
+        var dialog = (
+            <div className="mx_Dialog_Wrapper">
+                <div className="mx_Dialog">
+                    <Element {...props} onFinished={closeDialog}/>
+                </div>
+                <div className="mx_Dialog_Background" onClick={closeDialog}></div>
+            </div>
+        );
+
+        React.render(dialog, this.getOrCreateContainer());
+    },
+};