Add support for System theme - dynamic switching between Light and Dark themes (#405)

* add support for system theme

* add EN texts

src/_locales/en/messages.json

@@ -227,6 +227,9 @@
   "darkLabel": {
     "message": "Dark"
   },
+  "systemLabel": {
+    "message": "System"
+  },
   "buttonStyleLabel": {
     "message": "Translation button"
   },
@@ -299,6 +302,9 @@
   "resultFontColorLabel": {
     "message": "Font color of translation result"
   },
+  "isOverrideColorsLabel": {
+    "message": "Override default colors with colors below"
+  },
   "candidateFontColorLabel": {
     "message": "Font color of translation candidates"
   },

src/content/components/TranslatePanel.js

@@ -3,6 +3,7 @@ import React, { Component } from "react";
 import ReactDOM from "react-dom";
 import { getSettings } from "src/settings/settings";
 import "../styles/TranslatePanel.scss";
+import { getBackgroundColor, getCandidateFontColor, getResultFontColor } from "../../settings/defaultColors";
 
 const splitLine = text => {
   const regex = /(\n)/g;
@@ -173,17 +174,17 @@ export default class TranslatePanel extends Component {
       top: this.state.panelPosition.y,
       left: this.state.panelPosition.x,
       fontSize: parseInt(getSettings("fontSize")),
-      backgroundColor: getSettings("bgColor")
     };
+
+    const backgroundColor = getBackgroundColor()
+    if (backgroundColor) {
+      panelStyles.backgroundColor = backgroundColor.backgroundColor
+    }
+
     const wrapperStyles = {
       overflow: this.state.isOverflow ? "auto" : "hidden"
     };
-    const resultStyles = {
+
-      color: getSettings("resultFontColor")
-    };
-    const candidateStyles = {
-      color: getSettings("candidateFontColor")
-    };
     const translationApi = getSettings("translationApi");
 
     return (
@@ -195,10 +196,10 @@ export default class TranslatePanel extends Component {
         <div className="simple-translate-result-wrapper" ref="wrapper" style={wrapperStyles}>
           <div className="simple-translate-move" draggable="true" ref="move"></div>
           <div className="simple-translate-result-contents">
-            <p className="simple-translate-result" style={resultStyles} dir="auto">
+            <p className="simple-translate-result" style={getResultFontColor()} dir="auto">
               {splitLine(resultText)}
             </p>
-            <p className="simple-translate-candidate" style={candidateStyles} dir="auto">
+            <p className="simple-translate-candidate" style={getCandidateFontColor()} dir="auto">
               {splitLine(candidateText)}
             </p>
             {isError && (

src/content/index.js

@@ -216,7 +216,9 @@ const showTranslateContainer = (
   if (element) return;
   if (!isEnabled) return;
 
-  document.body.insertAdjacentHTML("beforeend", "<div id='simple-translate'></div>");
+  const themeClass = getSettings("theme") + "-theme";
+
+  document.body.insertAdjacentHTML("beforeend", `<div id="simple-translate" class="${themeClass}"></div>`);
   ReactDOM.render(
     <TranslateContainer
       removeContainer={removeTranslatecontainer}

src/content/styles/TranslateButton.scss

@@ -1,7 +1,7 @@
 #simple-translate {
   .simple-translate-button {
     all: initial;
-    background-color: #fff;
+    background-color: var(--simple-translate-main-bg);
     box-shadow: 0 2px 2px 0 rgba(0, 0, 0, 0.16), 0 0 0 1px rgba(0, 0, 0, 0.08);
     border-radius: 10%;
     background-size: 75%;

src/content/styles/TranslateContainer.scss

@@ -5,10 +5,35 @@
   }
   position: absolute;
 
-  --simple-translate-main-text: #0c0c0d;
-  --simple-translate-sub-text: #737373;
   --simple-translate-line: #ededf0;
   --simple-translate-button: #d7d7db;
   --simple-translate-highlight: #5595ff;
+}
+
+.light-theme {
+  --simple-translate-main-text: #0c0c0d;
+  --simple-translate-sub-text: #737373;
   --simple-translate-main-bg: #ffffff;
 }
+
+.dark-theme {
+  --simple-translate-main-text: #e6e6e6;
+  --simple-translate-sub-text: #aaaaaa;
+  --simple-translate-main-bg: #181818;
+}
+
+// copy of .light-theme
+.system-theme {
+  --simple-translate-main-text: #000000;
+  --simple-translate-sub-text: #737373;
+  --simple-translate-main-bg: #ffffff;
+}
+
+@media (prefers-color-scheme: dark) {
+  // copy of .dark-theme
+  .system-theme {
+    --simple-translate-main-text: #e6e6e6;
+    --simple-translate-sub-text: #aaaaaa;
+    --simple-translate-main-bg: #181818;
+  }
+}

src/content/styles/TranslatePanel.scss

@@ -44,8 +44,8 @@
           all: initial;
           display: block;
           margin: 0;
-          font-family: "Segoe UI", "San Francisco", "Ubuntu", "Fira Sans", "Roboto", "Arial",
+          font-family: "Segoe UI", "San Francisco", "Ubuntu", "Fira Sans",
-            "Helvetica", sans-serif !important;
+            "Roboto", "Arial", "Helvetica", sans-serif !important;
           word-wrap: break-word;
           font-size: inherit;
           line-height: 150%;
@@ -62,11 +62,11 @@
           background: var(--simple-translate-line);
         }
 
-        &.simple-translate-result {
+        .simple-translate-result {
           color: var(--simple-translate-main-text);
         }
-        &.simple-translate-candidate,
+        .simple-translate-candidate,
-        &.simple-translate-error {
+        .simple-translate-error {
           color: var(--simple-translate-sub-text);
           margin-top: 1em;
           &:empty {

src/options/components/OptionsPage.js

@@ -9,11 +9,16 @@ import "../styles/OptionsPage.scss";
 
 const setupTheme = async () => {
   await initSettings();
-  document.body.dataset.theme = getSettings("theme");
+  document.body.classList.add(getSettings("theme") + "-theme");
 
   browser.storage.onChanged.addListener((changes) => {
-    if (changes.Settings.newValue.theme === changes.Settings.oldValue.theme) return;
+    if (changes.Settings.newValue.theme === changes.Settings.oldValue.theme)
-    document.body.dataset.theme = changes.Settings.newValue.theme;
+      return;
+
+    document.body.classList.replace(
+      changes.Settings.oldValue.theme + "-theme",
+      changes.Settings.newValue.theme + "-theme"
+    );
   });
 };
 

src/options/styles/OptionsPage.scss

@@ -1,6 +1,4 @@
-body {
+.light-theme {
-  background-color: var(--main-bg);
-
   --main-text: #0c0c0d;
   --sub-text: #737373;
   --line: #ededf0;
@@ -9,8 +7,32 @@ body {
   --main-bg: #ffffff;
   --sub-bg: #ffffff;
   --new: #ff4f4f;
+}
 
-  &[data-theme="dark"] {
+.dark-theme {
+  --main-text: #e6e6e6;
+  --sub-text: #aaaaaa;
+  --line: #373737;
+  --button: #929292;
+  --highlight: #5595ff;
+  --main-bg: #181818;
+  --sub-bg: #101010;
+  --new: #ed5f5f;
+}
+
+.system-theme {
+  --main-text: #0c0c0d;
+  --sub-text: #737373;
+  --line: #ededf0;
+  --button: #d7d7db;
+  --highlight: #5595ff;
+  --main-bg: #ffffff;
+  --sub-bg: #ffffff;
+  --new: #ff4f4f;
+}
+
+@media (prefers-color-scheme: dark) {
+  .system-theme {
     --main-text: #e6e6e6;
     --sub-text: #aaaaaa;
     --line: #373737;
@@ -22,9 +44,13 @@ body {
   }
 }
 
+body {
+  background-color: var(--main-bg);
+}
+
 .optionsPage {
-  font-family: "Segoe UI", "San Francisco", "Ubuntu", "Fira Sans", "Roboto", "Arial", "Helvetica",
+  font-family: "Segoe UI", "San Francisco", "Ubuntu", "Fira Sans", "Roboto",
-    sans-serif;
+    "Arial", "Helvetica", sans-serif;
   font-size: 15px;
   font-weight: 400;
   color: var(--main-text);

src/popup/components/PopupPage.js

@@ -10,6 +10,7 @@ import InputArea from "./InputArea";
 import ResultArea from "./ResultArea";
 import Footer from "./Footer";
 import "../styles/PopupPage.scss";
+import { getBackgroundColor } from "../../settings/defaultColors";
 
 const logDir = "popup/PopupPage";
 
@@ -58,7 +59,8 @@ export default class PopupPage extends Component {
     overWriteLogLevel();
     updateLogLevel();
 
-    document.body.dataset.theme = getSettings("theme");
+    this.themeClass = getSettings("theme") + "-theme";
+    document.body.classList.add(this.themeClass)
     const targetLang = getSettings("targetLang");
     let langHistory = getSettings("langHistory");
     if (!langHistory) {

src/popup/styles/PopupPage.scss

@@ -1,11 +1,71 @@
+.light-theme {
+  --main-text: #0c0c0d;
+  --sub-text: #737373;
+  --line: #ededf0;
+  --button: #d7d7db;
+  --highlight: #5595ff;
+  --main-bg: #ffffff;
+  --confirm: #ff4f4f;
+  --error: #d70022;
+  --warn: #ff8f00;
+  --success: #058b00;
+  --info: #0a84ff;
+}
+
+.dark-theme {
+  --main-text: #e6e6e6;
+  --sub-text: #aaaaaa;
+  --line: #373737;
+  --button: #929292;
+  --highlight: #5595ff;
+  --main-bg: #181818;
+  --highlight-bg: #2e4343;
+  --confirm: #ed5f5f;
+  --error: #ca1532;
+  --warn: #ee8e12;
+  --success: #2a9c26;
+  --info: #1471d0;
+}
+
+.system-theme {
+  --main-text: #0c0c0d;
+  --sub-text: #737373;
+  --line: #ededf0;
+  --button: #d7d7db;
+  --highlight: #5595ff;
+  --main-bg: #ffffff;
+  --confirm: #ff4f4f;
+  --error: #d70022;
+  --warn: #ff8f00;
+  --success: #058b00;
+  --info: #0a84ff;
+}
+
+@media (prefers-color-scheme: dark) {
+  .system-theme {
+    --main-text: #e6e6e6;
+    --sub-text: #aaaaaa;
+    --line: #373737;
+    --button: #929292;
+    --highlight: #5595ff;
+    --main-bg: #181818;
+    --highlight-bg: #2e4343;
+    --confirm: #ed5f5f;
+    --error: #ca1532;
+    --warn: #ee8e12;
+    --success: #2a9c26;
+    --info: #1471d0;
+  }
+}
+
 html {
   scrollbar-width: none;
 }
 
 body {
   margin: 0;
-  font-family: "Segoe UI", "San Francisco", "Ubuntu", "Fira Sans", "Roboto", "Arial", "Helvetica",
+  font-family: "Segoe UI", "San Francisco", "Ubuntu", "Fira Sans", "Roboto",
-    sans-serif;
+    "Arial", "Helvetica", sans-serif;
   font-size: 13px;
   width: 100%;
   min-width: 348px;
@@ -26,31 +86,4 @@ body {
   ::-moz-selection {
     background: var(--line);
   }
-
-  --main-text: #0c0c0d;
-  --sub-text: #737373;
-  --line: #ededf0;
-  --button: #d7d7db;
-  --highlight: #5595ff;
-  --main-bg: #ffffff;
-  --confirm: #ff4f4f;
-  --error: #d70022;
-  --warn: #ff8f00;
-  --success: #058b00;
-  --info: #0a84ff;
-
-  &[data-theme="dark"] {
-    --main-text: #e6e6e6;
-    --sub-text: #aaaaaa;
-    --line: #373737;
-    --button: #929292;
-    --highlight: #5595ff;
-    --main-bg: #181818;
-    --highlight-bg: #2e4343;
-    --confirm: #ed5f5f;
-    --error: #ca1532;
-    --warn: #ee8e12;
-    --success: #2a9c26;
-    --info: #1471d0;
-  }
 }

src/settings/defaultColors.js

@@ -0,0 +1,41 @@
+import { getSettings } from "./settings";
+
+export const RESULT_FONT_COLOR_LIGHT = "#000000";
+export const RESULT_FONT_COLOR_DARK = "#e6e6e6";
+export const CANDIDATE_FONT_COLOR_LIGHT = "#737373";
+export const CANDIDATE_FONT_COLOR_DARK = "#aaaaaa";
+export const BG_COLOR_LIGHT = "#ffffff";
+export const BG_COLOR_DARK = "#181818";
+
+/**
+ * Return style object if color override is enabled
+ */
+export function getResultFontColor() {
+  const isOverrideColors = getSettings("isOverrideColors");
+
+  if (!isOverrideColors) return undefined;
+
+  return { color: getSettings("resultFontColor") };
+}
+
+/**
+ * Return style object if color override is enabled
+ */
+export function getCandidateFontColor() {
+  const isOverrideColors = getSettings("isOverrideColors");
+
+  if (!isOverrideColors) return undefined;
+
+  return { color: getSettings("candidateFontColor") };
+}
+
+/**
+ * Return style object if color override is enabled
+ */
+export function getBackgroundColor() {
+  const isOverrideColors = getSettings("isOverrideColors");
+
+  if (!isOverrideColors) return undefined;
+
+  return { backgroundColor: getSettings("bgColor") };
+}

src/settings/defaultSettings.js

@@ -2,6 +2,14 @@ import React from "react";
 import browser from "webextension-polyfill";
 import generateLangOptions from "src/common/generateLangOptions";
 import { getSettings, setSettings } from "./settings";
+import {
+  RESULT_FONT_COLOR_LIGHT,
+  RESULT_FONT_COLOR_DARK,
+  CANDIDATE_FONT_COLOR_LIGHT,
+  CANDIDATE_FONT_COLOR_DARK,
+  BG_COLOR_LIGHT,
+  BG_COLOR_DARK
+} from "./defaultColors"
 
 const getDefaultLangs = () => {
   const uiLang = browser.i18n.getUILanguage();
@@ -300,7 +308,7 @@ export default [
         title: "themeLabel",
         captions: ["themeCaptionLabel"],
         type: "select",
-        default: getTheme(),
+        default: 'system', 
         options: [
           {
             name: "lightLabel",
@@ -309,6 +317,10 @@ export default [
           {
             name: "darkLabel",
             value: "dark"
+          },
+          {
+            name: "systemLabel",
+            value: "system"
           }
         ]
       },
@@ -479,27 +491,40 @@ export default [
             default: 10,
             placeholder: 10
           },
+          {
+            id: "isOverrideColors",
+            title: "isOverrideColorsLabel",
+            captions: [],
+            type: "checkbox",
+            default: false
+          },
           {
             id: "resultFontColor",
             title: "resultFontColorLabel",
             captions: [],
             type: "color",
-            default: getTheme() === "light" ? "#000000" : "#e6e6e6"
+            default:
+              getTheme() === "light"
+                ? RESULT_FONT_COLOR_LIGHT
+                : RESULT_FONT_COLOR_DARK,
           },
           {
             id: "candidateFontColor",
             title: "candidateFontColorLabel",
             captions: [],
             type: "color",
-            default: getTheme() === "light" ? "#737373" : "#aaaaaa"
+            default:
+              getTheme() === "light"
+                ? CANDIDATE_FONT_COLOR_LIGHT
+                : CANDIDATE_FONT_COLOR_DARK,
           },
           {
             id: "bgColor",
             title: "bgColorLabel",
             captions: [],
             type: "color",
-            default: getTheme() === "light" ? "#ffffff" : "#181818"
+            default: getTheme() === "light" ? BG_COLOR_LIGHT : BG_COLOR_DARK,
-          }
+          },
         ]
       }
     ]