preview view model

src/RootViewModel.js

@@ -0,0 +1,36 @@
+/*
+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 {Link} from "./Link.js";
+import {ViewModel} from "./ViewModel.js";
+import {PreviewViewModel} from "./preview/PreviewViewModel.js";
+
+export class RootViewModel extends ViewModel {
+	constructor(request, hash) {
+		super();
+		this._request = request;
+		this.link = Link.parseFragment(hash);
+		this.previewViewModel = null;
+	}
+
+	load() {
+		if (this.link) {
+			this.previewViewModel = new PreviewViewModel(this._request, this.link);
+			this.emitChange();
+			this.previewViewModel.load();
+		}
+	}
+}