minimal working version of user preview

src/RootView.js

@@ -0,0 +1,29 @@
+/*
+Copyright 2020 The Matrix.org Foundation C.I.C.
+
+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 {TemplateView} from "./utils/TemplateView.js";
+import {PreviewView} from "./preview/PreviewView.js";
+
+export class RootView extends TemplateView {
+	render(t, vm) {
+		return t.div({className: "RootView"}, t.mapView(vm => vm.activeSection, activeSection => {
+			switch (activeSection) {
+				case "preview": return new PreviewView(vm.previewViewModel);
+				default: return null;
+			}
+		}));
+	}
+}