开始主题设置
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app/composables/useTheme.ts
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274
app/composables/useTheme.ts
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/**
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* @file app/composables/useTheme.ts
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* @description
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*
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* `useTheme` 是一个全局的主题管理"管家"(Composable)。它采用单例模式,确保在整个应用中只有一份主题状态。
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* 这个模块负责:
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* 1. **状态管理**:集中管理所有与主题相关的响应式状态,如主题模式(经典、优雅、简洁)、主题色、字体、字号等。
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* 2. **持久化**:将用户的设置保存到 localStorage,以便在下次访问时恢复。
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* 3. **应用样式**:动态地将主题设置应用到 `<html>` 根元素上,通过 CSS 变量和类名来控制全局样式。
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* 4. **提供接口**:向外暴露所有状态和方法,方便任何组件读取和修改主题设置。
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*
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* ---
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*
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* @usage
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*
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* **自动导入**:
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* 由于这个文件位于 `composables/` 目录下,Nuxt 会自动导入 `useTheme` 函数。
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* 你可以在任何 `.vue` 组件的 `<script setup>` 中直接使用,无需手动 `import`。
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*
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* **初始化**:
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* 应用启动时,`plugins/theme.client.ts` 插件会自动调用 `initializeTheme()` 方法,
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* 从 localStorage 加载用户设置并应用。
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*
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* **在组件中使用**:
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* ```vue
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* <script setup lang="ts">
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* // 直接解构获取需要的数据和方法
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* const { selectedTheme, selectedThemeColor, resetSettings } = useTheme();
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*
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* function handleReset() {
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* // 调用方法来修改主题
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* resetSettings();
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* }
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* </script>
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*
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* <template>
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* <div>
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* <p>当前主题: {{ selectedTheme }}</p>
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* <button @click="handleReset">重置设置</button>
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* </div>
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* </template>
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* ```
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*/
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import { ref, watch } from 'vue';
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// 定义各种选项
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const themes = [
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{ label: '经典', value: 'classic' },
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{ label: '优雅', value: 'elegant' },
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{ label: '简洁', value: 'minimal' }
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];
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const fonts = [
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{ label: '无衬线', value: 'sans-serif' },
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{ label: '衬线', value: 'serif' },
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{ label: '等宽', value: 'monospace' }
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];
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const fontSizes = [
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{ label: '更小', value: 'xs' },
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{ label: '稍小', value: 'sm' },
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{ label: '推荐', value: 'base' },
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{ label: '稍大', value: 'lg' },
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{ label: '更大', value: 'xl' }
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];
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const themeColors = [
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{ label: '经典蓝', value: 'blue', color: '#3B82F6' },
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{ label: '翡翠绿', value: 'emerald', color: '#10B981' },
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{ label: '活力橙', value: 'orange', color: '#F97316' },
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{ label: '柠檬黄', value: 'yellow', color: '#EAB308' },
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{ label: '薰衣紫', value: 'violet', color: '#8B5CF6' },
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{ label: '天空蓝', value: 'sky', color: '#0EA5E9' },
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{ label: '玫瑰金', value: 'rose', color: '#F43F5E' },
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{ label: '橄榄绿', value: 'lime', color: '#84CC16' },
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{ label: '石墨黑', value: 'gray', color: '#6B7280' },
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{ label: '雾烟灰', value: 'slate', color: '#64748B' },
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{ label: '樱花粉', value: 'pink', color: '#EC4899' }
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];
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const codeThemes = [
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{ label: 'dark', value: 'dark' },
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{ label: 'light', value: 'light' },
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{ label: 'github-dark', value: 'github-dark' },
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{ label: 'github-light', value: 'github-light' },
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{ label: 'one-dark-pro', value: 'one-dark-pro' },
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{ label: 'material-theme', value: 'material-theme' }
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];
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const captionFormats = [
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{ label: 'title 优先', value: 'title' },
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{ label: 'alt 优先', value: 'alt' },
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{ label: '只显示 title', value: 'title-only' },
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{ label: '只显示 alt', value: 'alt-only' }
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];
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// 默认设置
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const defaultSettings = {
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theme: 'elegant',
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font: 'sans-serif',
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fontSize: 'base',
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themeColor: 'blue',
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codeTheme: 'dark',
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captionFormat: 'none'
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};
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// 响应式状态
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const selectedTheme = ref<string>(defaultSettings.theme);
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const selectedFont = ref<string>(defaultSettings.font);
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const selectedFontSize = ref<string>(defaultSettings.fontSize);
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const selectedThemeColor = ref<string>(defaultSettings.themeColor);
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const customColor = ref<string>('#3B82F6');
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const selectedCodeTheme = ref<string>(defaultSettings.codeTheme);
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const selectedCaptionFormat = ref<string>(defaultSettings.captionFormat);
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// 这是一个单例,确保在整个应用中只有一个主题状态实例
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let isInitialized = false;
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export function useTheme() {
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const colorMode = useColorMode();
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const initializeTheme = () => {
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if (import.meta.client && !isInitialized) {
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selectedTheme.value = localStorage.getItem('app-theme') || defaultSettings.theme;
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selectedFont.value = localStorage.getItem('app-font') || defaultSettings.font;
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selectedFontSize.value = localStorage.getItem('app-font-size') || defaultSettings.fontSize;
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selectedThemeColor.value = localStorage.getItem('app-theme-color') || defaultSettings.themeColor;
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selectedCodeTheme.value = localStorage.getItem('app-code-theme') || defaultSettings.codeTheme;
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selectedCaptionFormat.value = localStorage.getItem('app-caption-format') || defaultSettings.captionFormat;
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// 找到自定义颜色对应的主题色值
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const initialColor = themeColors.find(c => c.value === selectedThemeColor.value)?.color || '#3B82F6';
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customColor.value = localStorage.getItem('app-custom-color') || initialColor;
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applyThemeVariables();
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isInitialized = true;
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console.log('主题已初始化');
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}
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};
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const applyThemeVariables = () => {
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if (import.meta.client) {
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const root = document.documentElement;
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// 颜色映射到 @nuxt/ui 支持的颜色
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const colorMapping: { [key: string]: string } = {
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'blue': 'blue',
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'emerald': 'emerald',
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'orange': 'orange',
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'yellow': 'yellow',
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'violet': 'violet',
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'sky': 'sky',
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'rose': 'rose',
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'lime': 'lime',
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'gray': 'gray',
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'slate': 'slate',
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'pink': 'pink'
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};
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// 使用 @nuxt/ui 的主题系统
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if (selectedThemeColor.value !== 'custom') {
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const mappedColor = colorMapping[selectedThemeColor.value];
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if (mappedColor) {
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const appConfig = useAppConfig();
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if (!appConfig.ui.colors) appConfig.ui.colors = {};
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appConfig.ui.colors.primary = mappedColor;
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}
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}
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// 字体设置保持不变
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const fontMapping = {
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'sans-serif': 'ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif',
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'serif': 'ui-serif, Georgia, Cambria, "Times New Roman", Times, serif',
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'monospace': 'ui-monospace, SFMono-Regular, "SF Mono", Consolas, "Liberation Mono", Menlo, monospace'
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};
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root.style.setProperty('--font-family', fontMapping[selectedFont.value as keyof typeof fontMapping]);
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const fontSizeMapping = {
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'xs': '0.75rem', 'sm': '0.875rem', 'base': '1rem', 'lg': '1.125rem', 'xl': '1.25rem'
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};
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root.style.setProperty('--font-size-base', fontSizeMapping[selectedFontSize.value as keyof typeof fontSizeMapping]);
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root.classList.remove('theme-classic', 'theme-elegant', 'theme-minimal');
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root.classList.add(`theme-${selectedTheme.value}`);
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}
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};
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/**
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* 应用自定义主色调
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*
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* Nuxt UI v3 不支持运行时动态自定义颜色,因此我们使用 CSS 变量覆盖的方法:
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* 1. 保持 Nuxt UI 使用有效的颜色系统(这里使用 'blue' 作为基础)
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* 2. 通过 CSS 变量 --ui-primary 覆盖实际显示的颜色
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* 3. 这样既保证了 Nuxt UI 系统正常工作,又实现了自定义颜色功能
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*/
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const applyCustomColor = () => {
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if (import.meta.client) {
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selectedThemeColor.value = 'custom';
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const root = document.documentElement;
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// 使用 Nuxt UI v3 推荐的 CSS 变量覆盖方法
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// 设置主色调的 CSS 变量,这会影响所有使用 primary 颜色的组件
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root.style.setProperty('--ui-primary', customColor.value);
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// 保持 Nuxt UI 使用有效的颜色系统
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const appConfig = useAppConfig();
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if (!appConfig.ui.colors) appConfig.ui.colors = {};
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appConfig.ui.colors.primary = 'blue'; // 使用有效的颜色名称作为基础
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}
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};
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const resetSettings = () => {
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selectedTheme.value = defaultSettings.theme;
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selectedFont.value = defaultSettings.font;
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selectedFontSize.value = defaultSettings.fontSize;
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selectedThemeColor.value = defaultSettings.themeColor;
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const defaultColor = themeColors.find(c => c.value === defaultSettings.themeColor)?.color || '#3B82F6';
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customColor.value = defaultColor;
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selectedCodeTheme.value = defaultSettings.codeTheme;
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selectedCaptionFormat.value = defaultSettings.captionFormat;
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colorMode.preference = 'system';
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applyThemeVariables();
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};
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// 监听预设主题色的变化,并同步更新自定义颜色选择器的值
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watch(selectedThemeColor, (newThemeColor) => {
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if (newThemeColor !== 'custom') {
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const colorObject = themeColors.find(c => c.value === newThemeColor);
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if (colorObject) {
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customColor.value = colorObject.color;
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//应用颜色
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applyCustomColor();
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}
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}
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});
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watch([selectedTheme, selectedFont, selectedFontSize, selectedThemeColor, selectedCodeTheme, selectedCaptionFormat, customColor], () => {
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applyThemeVariables();
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if (import.meta.client) {
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localStorage.setItem('app-theme', selectedTheme.value);
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localStorage.setItem('app-font', selectedFont.value);
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localStorage.setItem('app-font-size', selectedFontSize.value);
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localStorage.setItem('app-theme-color', selectedThemeColor.value);
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localStorage.setItem('app-code-theme', selectedCodeTheme.value);
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localStorage.setItem('app-caption-format', selectedCaptionFormat.value);
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if (selectedThemeColor.value === 'custom') {
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localStorage.setItem('app-custom-color', customColor.value);
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}
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}
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});
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return {
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initializeTheme,
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themes,
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fonts,
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fontSizes,
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themeColors,
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codeThemes,
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captionFormats,
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selectedTheme,
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selectedFont,
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selectedFontSize,
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selectedThemeColor,
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customColor,
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selectedCodeTheme,
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selectedCaptionFormat,
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applyCustomColor,
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resetSettings,
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colorMode
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};
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}
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