From 7aeb3d5dd4d53ce6a6fed03957ee6f5d9eee0f39 Mon Sep 17 00:00:00 2001
From: Elysia <a.elysia@proton.me>
Date: Fri, 13 Feb 2026 14:49:41 +0800
Subject: [PATCH] feat(theme): add system theme support

close #13
---
 electron/main/index.ts         | 14 ++++++++-
 src/App.vue                    | 56 ++++++++++++++++++++++++++++------
 src/components/AppSidebar.vue  |  4 +--
 src/components/ThemeToggle.vue | 35 +++++++++++++++------
 4 files changed, 87 insertions(+), 22 deletions(-)

diff --git a/electron/main/index.ts b/electron/main/index.ts
index a141dcae..631fa40c 100644
--- a/electron/main/index.ts
+++ b/electron/main/index.ts
@@ -1,4 +1,12 @@
-import { app, BrowserWindow, ipcMain, Menu, shell, Tray } from "electron";
+import {
+  app,
+  BrowserWindow,
+  ipcMain,
+  Menu,
+  shell,
+  Tray,
+  nativeTheme,
+} from "electron";
 import { fileURLToPath } from "node:url";
 import path from "node:path";
 import os from "node:os";
@@ -116,6 +124,10 @@ ipcMain.on("renderer-ready", (event, args) => {
   logger.info(`isLoaded set to: ${isLoaded.value}`);
 });
 
+ipcMain.on("set-theme-source", (event, theme: "system" | "light" | "dark") => {
+  nativeTheme.themeSource = theme;
+});
+
 app.whenReady().then(() => {
   createWindow();
   handleCommandLine(process.argv);
diff --git a/src/App.vue b/src/App.vue
index 3c2967e6..95f4b8de 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -9,7 +9,7 @@
         :categories="categories"
         :active-category="activeCategory"
         :category-counts="categoryCounts"
-        :is-dark-theme="isDarkTheme"
+        :theme-mode="themeMode"
         @toggle-theme="toggleTheme"
         @select-category="selectCategory"
       />
@@ -153,7 +153,15 @@ const axiosInstance = axios.create({
 });
 
 // 响应式状态
-const isDarkTheme = ref(false);
+const themeMode = ref<"light" | "dark" | "auto">("auto");
+const systemIsDark = ref(
+  window.matchMedia("(prefers-color-scheme: dark)").matches,
+);
+const isDarkTheme = computed(() => {
+  if (themeMode.value === "auto") return systemIsDark.value;
+  return themeMode.value === "dark";
+});
+
 const categories: Ref<Record<string, string>> = ref({});
 const apps: Ref<App[]> = ref([]);
 const activeCategory = ref("all");
@@ -218,18 +226,39 @@ const hasSelectedUpgrades = computed(() => {
 });
 
 // 方法
-const syncThemePreference = (enabled: boolean) => {
-  document.documentElement.classList.toggle("dark", enabled);
+const syncThemePreference = () => {
+  document.documentElement.classList.toggle("dark", isDarkTheme.value);
 };
 
 const initTheme = () => {
   const savedTheme = localStorage.getItem("theme");
-  isDarkTheme.value = savedTheme === "dark";
-  syncThemePreference(isDarkTheme.value);
+  if (
+    savedTheme === "dark" ||
+    savedTheme === "light" ||
+    savedTheme === "auto"
+  ) {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    themeMode.value = savedTheme as any;
+  } else {
+    themeMode.value = "auto";
+  }
+  window.ipcRenderer.send(
+    "set-theme-source",
+    themeMode.value === "auto" ? "system" : themeMode.value,
+  );
+  syncThemePreference();
+
+  window
+    .matchMedia("(prefers-color-scheme: dark)")
+    .addEventListener("change", (e) => {
+      systemIsDark.value = e.matches;
+    });
 };
 
 const toggleTheme = () => {
-  isDarkTheme.value = !isDarkTheme.value;
+  if (themeMode.value === "auto") themeMode.value = "light";
+  else if (themeMode.value === "light") themeMode.value = "dark";
+  else themeMode.value = "auto";
 };
 
 const selectCategory = (category: string) => {
@@ -736,8 +765,15 @@ onMounted(async () => {
 });
 
 // 观察器
-watch(isDarkTheme, (newVal) => {
-  localStorage.setItem("theme", newVal ? "dark" : "light");
-  syncThemePreference(newVal);
+watch(themeMode, (newVal) => {
+  localStorage.setItem("theme", newVal);
+  window.ipcRenderer.send(
+    "set-theme-source",
+    newVal === "auto" ? "system" : newVal,
+  );
+});
+
+watch(isDarkTheme, () => {
+  syncThemePreference();
 });
 </script>
diff --git a/src/components/AppSidebar.vue b/src/components/AppSidebar.vue
index a6a840d5..5b2b6a5e 100644
--- a/src/components/AppSidebar.vue
+++ b/src/components/AppSidebar.vue
@@ -17,7 +17,7 @@
       </div>
     </div>
 
-    <ThemeToggle :is-dark="isDarkTheme" @toggle="toggleTheme" />
+    <ThemeToggle :theme-mode="themeMode" @toggle="toggleTheme" />
 
     <div class="flex-1 space-y-2 overflow-y-auto scrollbar-muted pr-2">
       <button
@@ -72,7 +72,7 @@ defineProps<{
   categories: Record<string, any>;
   activeCategory: string;
   categoryCounts: Record<string, number>;
-  isDarkTheme: boolean;
+  themeMode: "light" | "dark" | "auto";
 }>();
 
 const emit = defineEmits<{
diff --git a/src/components/ThemeToggle.vue b/src/components/ThemeToggle.vue
index 24bb88aa..573ad361 100644
--- a/src/components/ThemeToggle.vue
+++ b/src/components/ThemeToggle.vue
@@ -2,15 +2,12 @@
   <button
     type="button"
     class="flex items-center justify-between rounded-2xl border border-slate-200/80 bg-white/70 px-4 py-3 text-sm font-medium text-slate-600 shadow-sm transition hover:border-brand/40 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-brand/40 dark:border-slate-800/70 dark:bg-slate-900/60 dark:text-slate-300"
-    :aria-pressed="isDark"
+    :aria-pressed="themeMode === 'dark'"
     @click="toggle"
   >
     <span class="flex items-center gap-2">
-      <i
-        class="fas"
-        :class="isDark ? 'fa-moon text-amber-200' : 'fa-sun text-amber-400'"
-      ></i>
-      <span>{{ isDark ? "深色主题" : "浅色主题" }}</span>
+      <i class="fas" :class="iconClass"></i>
+      <span>{{ label }}</span>
     </span>
     <span
       class="relative inline-flex h-6 w-12 items-center rounded-full bg-slate-300/80 transition dark:bg-slate-700"
@@ -18,7 +15,7 @@
       <span
         :class="[
           'inline-block h-4 w-4 rounded-full bg-white shadow transition',
-          isDark ? 'translate-x-6' : 'translate-x-1',
+          togglePosition,
         ]"
       ></span>
     </span>
@@ -26,8 +23,10 @@
 </template>
 
 <script setup lang="ts">
-defineProps<{
-  isDark: boolean;
+import { computed } from "vue";
+
+const props = defineProps<{
+  themeMode: "light" | "dark" | "auto";
 }>();
 
 const emit = defineEmits<{
@@ -37,4 +36,22 @@ const emit = defineEmits<{
 const toggle = () => {
   emit("toggle");
 };
+
+const label = computed(() => {
+  if (props.themeMode === "auto") return "跟随系统";
+  if (props.themeMode === "dark") return "深色主题";
+  return "浅色主题";
+});
+
+const iconClass = computed(() => {
+  if (props.themeMode === "auto") return "fa-adjust text-slate-500";
+  if (props.themeMode === "dark") return "fa-moon text-amber-200";
+  return "fa-sun text-amber-400";
+});
+
+const togglePosition = computed(() => {
+  if (props.themeMode === "auto") return "translate-x-4";
+  if (props.themeMode === "dark") return "translate-x-7";
+  return "translate-x-1";
+});
 </script>