Implement font selection

src/settings/Settings.js

@@ -30,6 +30,8 @@ import PushToMatrixClientController from './controllers/PushToMatrixClientContro
 import ReloadOnChangeController from "./controllers/ReloadOnChangeController";
 import {RIGHT_PANEL_PHASES} from "../stores/RightPanelStorePhases";
 import FontSizeController from './controllers/FontSizeController';
+import SystemFontController from './controllers/SystemFontController';
+import UseSystemFontController from './controllers/UseSystemFontController';
 
 // These are just a bunch of helper arrays to avoid copy/pasting a bunch of times
 const LEVELS_ROOM_SETTINGS = ['device', 'room-device', 'room-account', 'account', 'config'];
@@ -313,6 +315,18 @@ export const SETTINGS = {
         default: true,
         displayName: _td("Match system theme"),
     },
+    "useSystemFont": {
+        supportedLevels: LEVELS_DEVICE_ONLY_SETTINGS,
+        default: false,
+        displayName: _td("Use a system font"),
+        controller: new UseSystemFontController(),
+    },
+    "systemFont": {
+        supportedLevels: LEVELS_DEVICE_ONLY_SETTINGS,
+        default: "",
+        displayName: _td("System font name"),
+        controller: new SystemFontController(),
+    },
     "webRtcAllowPeerToPeer": {
         supportedLevels: LEVELS_DEVICE_ONLY_SETTINGS_WITH_CONFIG,
         displayName: _td('Allow Peer-to-Peer for 1:1 calls'),

src/settings/controllers/FontSizeController.ts

@@ -16,6 +16,8 @@ limitations under the License.
 
 import SettingController from "./SettingController";
 import dis from "../../dispatcher/dispatcher";
+import { UpdateFontSizePayload } from "../../dispatcher/payloads/UpdateFontSizePayload";
+import { Action } from "../../dispatcher/actions";
 
 export default class FontSizeController extends SettingController {
     constructor() {
@@ -24,8 +26,8 @@ export default class FontSizeController extends SettingController {
 
     onChange(level, roomId, newValue) {
         // Dispatch font size change so that everything open responds to the change.
-        dis.dispatch({
-            action: "update-font-size",
+        dis.dispatch<UpdateFontSizePayload>({
+            action: Action.UpdateFontSize,
             size: newValue,
         });
     }

src/settings/controllers/SystemFontController.ts

@@ -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 SettingController from "./SettingController";
+import SettingsStore from "../SettingsStore";
+import dis from "../../dispatcher/dispatcher";
+import { UpdateSystemFontPayload } from "../../dispatcher/payloads/UpdateSystemFontPayload";
+import { Action } from "../../dispatcher/actions";
+
+export default class SystemFontController extends SettingController {
+    constructor() {
+        super();
+    }
+
+    onChange(level, roomId, newValue) {
+        // Dispatch font size change so that everything open responds to the change.
+        dis.dispatch<UpdateSystemFontPayload>({
+            action: Action.UpdateSystemFont,
+            useSystemFont: SettingsStore.getValue("useSystemFont"),
+            font: newValue,
+        });
+    }
+}

src/settings/controllers/UseSystemFontController.ts

@@ -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 SettingController from "./SettingController";
+import SettingsStore from "../SettingsStore";
+import dis from "../../dispatcher/dispatcher";
+import { UpdateSystemFontPayload } from "../../dispatcher/payloads/UpdateSystemFontPayload";
+import { Action } from "../../dispatcher/actions";
+
+export default class UseSystemFontController extends SettingController {
+    constructor() {
+        super();
+    }
+
+    onChange(level, roomId, newValue) {
+        // Dispatch font size change so that everything open responds to the change.
+        dis.dispatch<UpdateSystemFontPayload>({
+            action: Action.UpdateSystemFont,
+            useSystemFont: newValue,
+            font: SettingsStore.getValue("systemFont"),
+        });
+    }
+}

src/settings/watchers/FontWatcher.ts

@@ -18,6 +18,8 @@ import dis from '../../dispatcher/dispatcher';
 import SettingsStore, {SettingLevel} from '../SettingsStore';
 import IWatcher from "./Watcher";
 import { toPx } from '../../utils/units';
+import { Action } from '../../dispatcher/actions';
+import { UpdateSystemFontPayload } from '../../dispatcher/payloads/UpdateSystemFontPayload';
 
 export class FontWatcher implements IWatcher {
     public static readonly MIN_SIZE = 8;
@@ -33,6 +35,10 @@ export class FontWatcher implements IWatcher {
 
     public start() {
         this.setRootFontSize(SettingsStore.getValue("baseFontSize"));
+        this.setSystemFont({
+            useSystemFont: SettingsStore.getValue("useSystemFont"),
+            font: SettingsStore.getValue("systemFont"),
+        })
         this.dispatcherRef = dis.register(this.onAction);
     }
 
@@ -41,8 +47,10 @@ export class FontWatcher implements IWatcher {
     }
 
     private onAction = (payload) => {
-        if (payload.action === 'update-font-size') {
+        if (payload.action === Action.UpdateFontSize) {
             this.setRootFontSize(payload.size);
+        } else if (payload.action === Action.UpdateSystemFont) {
+            this.setSystemFont(payload)
         }
     };
 
@@ -54,4 +62,8 @@ export class FontWatcher implements IWatcher {
         }
         (<HTMLElement>document.querySelector(":root")).style.fontSize = toPx(fontSize);
     };
+
+    private setSystemFont = ({useSystemFont, font}) => {
+        document.body.style.fontFamily = useSystemFont ? font : "";
+    }
 }