Convert ThemeController to TS

src/settings/controllers/ThemeController.ts

@@ -0,0 +1,38 @@
+/*
+Copyright 2019 Michael Telatynski <7t3chguy@gmail.com>
+Copyright 2019, 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 SettingController from "./SettingController";
+import {DEFAULT_THEME, enumerateThemes} from "../../theme";
+import { SettingLevel } from "../SettingLevel";
+
+export default class ThemeController extends SettingController {
+    public static isLogin = false;
+
+    public getValueOverride(level: SettingLevel, roomId: string, calculatedValue: any, calculatedAtLevel: any): any {
+        if (!calculatedValue) return null; // Don't override null themes
+
+        if (ThemeController.isLogin) return 'light';
+
+        const themes = enumerateThemes();
+        // Override in case some no longer supported theme is stored here
+        if (!themes[calculatedValue]) {
+            return DEFAULT_THEME;
+        }
+
+        return null; // no override
+    }
+}