Font scaling settings and slider

res/css/_components.scss

@@ -115,6 +115,7 @@
 @import "./views/elements/_RichText.scss";
 @import "./views/elements/_RoleButton.scss";
 @import "./views/elements/_RoomAliasField.scss";
+@import "./views/elements/_Slider.scss";
 @import "./views/elements/_Spinner.scss";
 @import "./views/elements/_SyntaxHighlight.scss";
 @import "./views/elements/_TextWithTooltip.scss";
@@ -206,6 +207,7 @@
 @import "./views/settings/tabs/room/_GeneralRoomSettingsTab.scss";
 @import "./views/settings/tabs/room/_RolesRoomSettingsTab.scss";
 @import "./views/settings/tabs/room/_SecurityRoomSettingsTab.scss";
+@import "./views/settings/tabs/user/_AppearanceUserSettingsTab.scss";
 @import "./views/settings/tabs/user/_GeneralUserSettingsTab.scss";
 @import "./views/settings/tabs/user/_HelpUserSettingsTab.scss";
 @import "./views/settings/tabs/user/_MjolnirUserSettingsTab.scss";

res/css/structures/_TagPanel.scss

@@ -69,7 +69,7 @@ limitations under the License.
     height: 100%;
 }
 .mx_TagPanel .mx_TagPanel_tagTileContainer > div {
-    height: $font-40px;
+    height: 40px;
     padding: 10px 0 9px 0;
 }
 
@@ -116,7 +116,7 @@ limitations under the License.
     position: absolute;
     left: -15px;
     border-radius: 0 3px 3px 0;
-    top: -8px; // (16px / 2)
+    top: -8px; // (16px from height / 2)
 }
 
 .mx_TagPanel .mx_TagTile.mx_AccessibleButton:focus {

res/css/structures/_TopLeftMenuButton.scss

@@ -43,7 +43,7 @@ limitations under the License.
     margin: 0 7px;
     mask: url('$(res)/img/feather-customised/dropdown-arrow.svg');
     mask-repeat: no-repeat;
-    width: 10px;
+    width: $font-22px;
     height: 6px;
     background-color: $roomsublist-label-fg-color;
 }

res/css/views/dialogs/_UserSettingsDialog.scss

@@ -21,6 +21,10 @@ limitations under the License.
     mask-image: url('$(res)/img/feather-customised/settings.svg');
 }
 
+.mx_UserSettingsDialog_appearanceIcon::before {
+    mask-image: url('$(res)/img/feather-customised/brush.svg');
+}
+
 .mx_UserSettingsDialog_voiceIcon::before {
     mask-image: url('$(res)/img/feather-customised/phone.svg');
 }

res/css/views/elements/_Slider.scss

@@ -0,0 +1,99 @@
+/*
+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.
+*/
+
+.mx_Slider {
+    position: relative;
+    margin: 0px;
+    flex-grow: 1;
+}
+
+.mx_Slider_dotContainer {
+    display: flex;
+    flex-direction: row;
+    justify-content: space-between;
+}
+
+.mx_Slider_bar {
+    display: flex;
+    box-sizing: border-box;
+    position: absolute;
+    height: 1em;
+    width: 100%;
+    padding: 0 0.5em; // half the width of a dot.
+    align-items: center;
+}
+
+.mx_Slider_bar > hr {
+    width: 100%;
+    height: 0.4em;
+    background-color: $slider-background-color;
+    border: 0;
+}
+
+.mx_Slider_selection {
+    display: flex;
+    align-items: center;
+    width: calc(100% - 1em); // 2 * half the width of a dot
+    height: 1em;
+    position: absolute;
+    pointer-events: none;
+}
+
+.mx_Slider_selectionDot {
+    position: absolute;
+    width: 1.1em;
+    height: 1.1em;
+    background-color: $slider-selection-color;
+    border-radius: 50%;
+    box-shadow: 0 0 6px lightgrey;
+    z-index: 10;
+}
+
+.mx_Slider_selection > hr {
+    margin: 0;
+    border: 0.2em solid $slider-selection-color;
+}
+
+.mx_Slider_dot {
+    height: 1em;
+    width: 1em;
+    border-radius: 50%;
+    background-color: $slider-background-color;
+    z-index: 0;
+}
+
+.mx_Slider_dotActive {
+    background-color: $slider-selection-color;
+}
+
+.mx_Slider_dotValue {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    color: $slider-background-color;
+}
+
+// The following is a hack to center the labels without adding
+// any width to the slider's dots.
+.mx_Slider_labelContainer {
+    width: 1em;
+}
+
+.mx_Slider_label {
+    position: relative;
+    width: fit-content;
+    left: -50%;
+}

res/css/views/rooms/_RoomTile.scss

@@ -20,7 +20,7 @@ limitations under the License.
     flex-direction: row;
     align-items: center;
     cursor: pointer;
-    height: $font-34px;
+    height: 32px;
     margin: 0;
     padding: 0 8px 0 10px;
     position: relative;
@@ -81,6 +81,7 @@ limitations under the License.
 
 .mx_RoomTile_avatar_container {
     position: relative;
+    display: flex;
 }
 
 .mx_RoomTile_avatar {

res/css/views/settings/tabs/user/_AppearanceUserSettingsTab.scss

@@ -0,0 +1,45 @@
+/*
+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.
+*/
+
+.mx_AppearanceUserSettingsTab_fontSlider,
+.mx_AppearanceUserSettingsTab_themeSection .mx_Field,
+.mx_AppearanceUserSettingsTab_fontScaling .mx_Field {
+    @mixin mx_Settings_fullWidthField;
+}
+
+.mx_AppearanceUserSettingsTab_fontSlider {
+    display: flex;
+    flex-direction: row;
+    align-items: center;
+    padding: 15px;
+    background: $font-slider-bg-color;
+    border-radius: 10px;
+    font-size: 10px;
+    margin-top: 24px;
+    margin-bottom: 24px;
+}
+
+.mx_AppearanceUserSettingsTab_fontSlider_smallText {
+    font-size: 15px;
+    padding-right: 20px;
+    padding-left: 5px;
+}
+
+.mx_AppearanceUserSettingsTab_fontSlider_largeText {
+    font-size: 18px;
+    padding-left: 20px;
+    padding-right: 5px;
+}

res/css/views/settings/tabs/user/_GeneralUserSettingsTab.scss

@@ -14,8 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-.mx_GeneralUserSettingsTab_changePassword .mx_Field,
-.mx_GeneralUserSettingsTab_themeSection .mx_Field {
+.mx_GeneralUserSettingsTab_changePassword .mx_Field {
     @mixin mx_Settings_fullWidthField;
 }
 

res/themes/dark/css/_dark.scss

@@ -180,6 +180,9 @@ $breadcrumb-placeholder-bg-color: #272c35;
 
 $user-tile-hover-bg-color: $header-panel-bg-color;
 
+// FontSlider colors
+$font-slider-bg-color: $room-highlight-color;
+
 // ***** Mixins! *****
 
 @define-mixin mx_DialogButton {

res/themes/light/css/_light.scss

@@ -262,6 +262,10 @@ $togglesw-off-color: #c1c9d6;
 $togglesw-on-color: $accent-color;
 $togglesw-ball-color: #fff;
 
+// Slider
+$slider-selection-color: $accent-color;
+$slider-background-color: #c1c9d6;
+
 $progressbar-color: #000;
 
 $room-warning-bg-color: $yellow-background;
@@ -302,6 +306,9 @@ $breadcrumb-placeholder-bg-color: #e8eef5;
 
 $user-tile-hover-bg-color: $header-panel-bg-color;
 
+// FontSlider colors
+$font-slider-bg-color: rgba($input-darker-bg-color, 0.2);
+
 // ***** Mixins! *****
 
 @define-mixin mx_DialogButton {

src/FontWatcher.js

@@ -0,0 +1,51 @@
+/*
+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 dis from './dispatcher/dispatcher';
+import SettingsStore, {SettingLevel} from './settings/SettingsStore';
+
+export class FontWatcher {
+    static MIN_SIZE = 13;
+    static MAX_SIZE = 20;
+
+    constructor() {
+        this._dispatcherRef = null;
+    }
+
+    start() {
+        this._setRootFontSize(SettingsStore.getValue("fontSize"));
+        this._dispatcherRef = dis.register(this._onAction);
+    }
+
+    stop() {
+        dis.unregister(this._dispatcherRef);
+    }
+
+    _onAction = (payload) => {
+        if (payload.action === 'update-font-size') {
+            this._setRootFontSize(payload.size);
+        }
+    };
+
+    _setRootFontSize = (size) => {
+        const fontSize = Math.max(Math.min(FontWatcher.MAX_SIZE, size), FontWatcher.MIN_SIZE);
+
+        if (fontSize != size) {
+            SettingsStore.setValue("fontSize", null, SettingLevel.Device, fontSize);
+        }
+        document.querySelector(":root").style.fontSize = fontSize + "px";
+    };
+}

src/components/structures/MatrixChat.tsx

@@ -60,6 +60,7 @@ import AutoDiscoveryUtils, { ValidatedServerConfig } from "../../utils/AutoDisco
 import DMRoomMap from '../../utils/DMRoomMap';
 import { countRoomsWithNotif } from '../../RoomNotifs';
 import { ThemeWatcher } from "../../theme";
+import { FontWatcher } from '../../FontWatcher';
 import { storeRoomAliasInCache } from '../../RoomAliasCache';
 import { defer, IDeferred } from "../../utils/promise";
 import ToastStore from "../../stores/ToastStore";
@@ -216,6 +217,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
     private readonly loggedInView: React.RefObject<LoggedInViewType>;
     private readonly dispatcherRef: any;
     private readonly themeWatcher: ThemeWatcher;
+    private readonly fontWatcher: FontWatcher;
 
     constructor(props, context) {
         super(props, context);
@@ -283,8 +285,11 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
         this.accountPasswordTimer = null;
 
         this.dispatcherRef = dis.register(this.onAction);
+
         this.themeWatcher = new ThemeWatcher();
+        this.fontWatcher = new FontWatcher();
         this.themeWatcher.start();
+        this.fontWatcher.start();
 
         this.focusComposer = false;
 
@@ -367,6 +372,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
         Lifecycle.stopMatrixClient();
         dis.unregister(this.dispatcherRef);
         this.themeWatcher.stop();
+        this.fontWatcher.stop();
         window.removeEventListener('resize', this.handleResize);
         this.state.resizeNotifier.removeListener("middlePanelResized", this.dispatchTimelineResize);
 

src/components/structures/RoomSubList.js

@@ -32,7 +32,7 @@ import RoomTile from "../views/rooms/RoomTile";
 import LazyRenderList from "../views/elements/LazyRenderList";
 import {_t} from "../../languageHandler";
 import {RovingTabIndexWrapper} from "../../accessibility/RovingTabIndex";
-import toRem from "../../utils/rem";
+import {toPx} from "../../utils/units";
 
 // turn this on for drop & drag console debugging galore
 const debug = false;
@@ -420,7 +420,7 @@ export default class RoomSubList extends React.PureComponent {
 
     setHeight = (height) => {
         if (this._subList.current) {
-            this._subList.current.style.height = toRem(height);
+            this._subList.current.style.height = toPx(height);
         }
         this._updateLazyRenderHeight(height);
     };