vue3 中主题定制

背景

做多主题定制，黑/白，里面还要再分各种颜色，每次进来都要记住上次的主题设置

效果图

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一、目录结构

├── generated
│   ├── theme  
│   │   └── dark-yellow.ts
│   │   └── dark-orange.ts
│   │   └── light-yellow.ts
│   │   └── light-orange.ts
│   │   └── theme.enums.ts
├── stores 
│   ├── theme-store.ts

数据结构

主题
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枚举

二、流程

Init的时候，根据 store 中的颜色主题，先做一次匹配，changeTheme
切换主题的时候，监听绑定的值，做 changeTheme
changeTheme 主要就是读取文件列表，做匹配，做规则制定，最后使用 document.documentElement.style.setProperty 设置style,根据css 变量做匹配

三、核心实现

init 时，设置已存储的theme

import { setupTheme } from '@/stores/theme-store'
const app = createApp(App)
initApp(app)const initApp = async (app: App) => {setupStore(app)setupRouter(app)setupLang(app)setupTheme()app.mount('#app')
}

读取配置主题文件(匹配到的文件默认是懒加载的，通过动态导入实现eager: true)

const themeFileList: Record<string, string> = import.meta.glob(['@/generated/theme/*.ts', '!@/generated/theme/theme.enums.ts'],{import: 'default',eager: true}
)

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根据文件夹匹配出主题key

const themeFileListObject = {}
for (const key in themeFileList) {const filename = key.split('/').pop()?.replace('.ts', '')if (filename) {themeFileListObject[filename] = themeFileList[key]}
}

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替换root 样式(根据存储key匹配出当前色值表，format css name，then set style)

const injectRootStyle = (theme: ThemeEnum) => {const themeObject = themeFileListObject[theme]for (const key in themeObject) {const cssVariableName = `--${key.replace(/_/g, '-').toLowerCase()}`document.documentElement.style.setProperty(cssVariableName, themeObject[key])}
}

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Pian 中做数据监听，data change to call changeTheme function.

watch(theme, (nVal) => {changeTheme(nVal)
})
// 改变主题
const changeTheme = (theme: ThemeEnum) => {injectRootStyle(theme)
}
//设置主题
const setupTheme = () => {changeTheme(useThemeStore().theme)
}

四、总体代码

import ThemeEnum from '@/generated/theme/theme-enum'
import { defineStore } from 'pinia'
import { ref, watch } from 'vue'// 读取全部主题配置
const themeFileList: Record<string, string> = import.meta.glob(['@/generated/theme/*.ts', '!@/generated/theme/theme.enums.ts'],{import: 'default',eager: true}
)// 根据读取的文件路径，生成名称和地址
const themeFileListObject = {}
for (const key in themeFileList) {const filename = key.split('/').pop()?.replace('.ts', '')if (filename) {themeFileListObject[filename] = themeFileList[key]}
}// 注入根样式
const injectRootStyle = (theme: ThemeEnum) => {const themeObject = themeFileListObject[theme]for (const key in themeObject) {const cssVariableName = `--${key.replace(/_/g, '-').toLowerCase()}`document.documentElement.style.setProperty(cssVariableName, themeObject[key])}
}// 定义一个函数，用于改变主题
const changeTheme = (theme: ThemeEnum) => {// 注入根样式injectRootStyle(theme)
}// 定义一个函数，用于设置主题
const setupTheme = () => {// 改变主题changeTheme(useThemeStore().theme)
}const useThemeStore = defineStore('theme',() => {const theme = ref(ThemeEnum['light-red'])watch(theme, (nVal) => {changeTheme(nVal)})return { theme }},{ persist: true }
)export { setupTheme, changeTheme, useThemeStore }