From 30927efc60e1428f86a4aa619cb340d9488386ba Mon Sep 17 00:00:00 2001
From: Rocka <i@rocka.me>
Date: Sat, 21 Nov 2020 15:14:35 +0800
Subject: [PATCH] renderer: 'auto' theme variety leveraging css
 prefers-color-scheme

---
 src/renderer/main.js                    | 21 +++++++++++++++++++--
 src/renderer/page/Settings/Settings.vue | 12 +++++++++---
 src/renderer/page/Settings/entries.js   |  1 +
 src/renderer/store/modules/settings.js  |  2 +-
 4 files changed, 30 insertions(+), 6 deletions(-)

diff --git a/src/renderer/main.js b/src/renderer/main.js
index 048dd563..0bd59589 100644
--- a/src/renderer/main.js
+++ b/src/renderer/main.js
@@ -10,7 +10,7 @@ import App from './App.vue';
 import store from './store';
 import routes from './routes';
 import { isLinux } from './util/globals';
-import { initTheme } from './util/theme';
+import { initTheme, setTheme } from './util/theme';
 import DblclickRipple from './util/dblclick-ripple';
 import './style.css';
 import './transition.css';
@@ -23,12 +23,17 @@ Vue.use(Message);
 Vue.use(DblclickRipple);
 Vue.component('RecycleScroller', RecycleScroller);
 
+const darkMediaQuery = window.matchMedia('(prefers-color-scheme: dark)');
+
 try {
     const settings = JSON.parse(sessionStorage.getItem('settings'));
+    const themeVariety = settings.themeVariety === 'auto'
+        ? (darkMediaQuery.matches ? 'dark' : 'light')
+        : settings.themeVariety;
     initTheme({
         primary: settings.themePrimaryColor,
         secondary: settings.themeSecondaryColor
-    }, settings.themeVariety);
+    }, themeVariety);
 } catch (e) { sessionStorage.removeItem('settings'); }
 
 require('@/util/tray').injectStore(store);
@@ -76,9 +81,21 @@ if (store.state.settings.startupPage !== 'index') {
 const app = new Vue({
     store,
     router,
+    provide: {
+        darkMediaQuery
+    },
     extends: App
 });
 
+darkMediaQuery.addEventListener('change', e => {
+    if (store.state.settings.themeVariety !== 'auto') return;
+    const variety = e.matches ? 'dark' : 'light';
+    setTheme({
+        primary: store.state.settings.themePrimaryColor,
+        secondary: store.state.settings.themeSecondaryColor
+    }, variety);
+});
+
 if (isLinux) {
     app.$once('audio-ready', audio => {
         const m = require('@/util/mpris');
diff --git a/src/renderer/page/Settings/Settings.vue b/src/renderer/page/Settings/Settings.vue
index bf0f94a6..94cb4adc 100644
--- a/src/renderer/page/Settings/Settings.vue
+++ b/src/renderer/page/Settings/Settings.vue
@@ -51,6 +51,9 @@ export default {
             versionName: ''
         };
     },
+    inject: [
+        'darkMediaQuery'
+    ],
     computed: {
         ...mapState(['settings'])
     },
@@ -166,10 +169,13 @@ export default {
                         case 'themePrimaryColor':
                         case 'themeSecondaryColor':
                         case 'themeVariety':
+                            const variety = state.settings.themeVariety === 'auto'
+                                ? (this.darkMediaQuery.matches ? 'dark' : 'light')
+                                : state.settings.themeVariety;
                             setTheme({
                                 primary: state.settings.themePrimaryColor,
                                 secondary: state.settings.themeSecondaryColor
-                            }, state.settings.themeVariety);
+                            }, variety);
                             break;
                         case 'windowBorder':
                             this.$nextTick(() => this.recreateWindow());
@@ -186,12 +192,12 @@ export default {
                             ipcRenderer.send(IpcTag, key, val);
                             break;
                         case 'bitRate':
-                            if(val === 'ex') {
+                            if (val === 'ex') {
                                 this.$toast.message('实际播放码率取决于歌曲最高码率和帐号最高可播放码率');
                             }
                             break;
                         case 'bitRateDownload':
-                            if(val === 'ex') {
+                            if (val === 'ex') {
                                 this.$toast.message('实际下载码率取决于歌曲最高码率和帐号最高可播放码率');
                             }
                             break;
diff --git a/src/renderer/page/Settings/entries.js b/src/renderer/page/Settings/entries.js
index d419f39b..241447f2 100644
--- a/src/renderer/page/Settings/entries.js
+++ b/src/renderer/page/Settings/entries.js
@@ -17,6 +17,7 @@ export const Entries = [
                 title: '背景色',
                 prop: 'themeVariety',
                 options: [
+                    { label: '跟随系统', value: 'auto' },
                     { label: '亮色', value: 'light' },
                     { label: '暗色', value: 'dark' }
                 ]
diff --git a/src/renderer/store/modules/settings.js b/src/renderer/store/modules/settings.js
index 462003bb..06272b10 100644
--- a/src/renderer/store/modules/settings.js
+++ b/src/renderer/store/modules/settings.js
@@ -15,7 +15,7 @@ const DefaultSettings = {
     minimizeOnStartup: false,
     themePrimaryColor: '#7e57c2',
     themeSecondaryColor: '#ff4081',
-    themeVariety: 'light',
+    themeVariety: 'auto',
     autoReplacePlaylist: false
 };