【VUE】ElementPlus之动态主题色调切换(Vue3 + Element Plus+Scss + Pinia)

前言

关于ElementPlus的基础主题色自定义可以参阅《【VUE】ElementPlus之自定义主题样式和命名空间》

有了上面基础的了解，我们知道ElementPlus的主题色调是基于CSS3变量特性进行全局控制的，
那么接下来我们也基于CSS3变量来实现主题色调的动态切换效果；

主要控制的色调类型有：primary、success、warning、danger、error、info
针对这六个色调类型分别进行0、3、5、7、8、9级的渐变色定制

以下是默认情况下的主题颜色定义：

接下来，我们基于以下环境来实操下：

• vue: ^3.3.4
• vite: ^4.4.11
• sass: ^1.58.3
• element-plus: ^2.3.4
• pinia: ^2.1.7

实现

默认主题色下的按钮组件色调：

预想效果：

在实现具体交互之前，我们先准备几个辅助小工具

颜色状态管理器

既然是动态切换，那么我们就需要一个容器来记录当下的一些色调信息，便于整体性的调整
以下仅抛个砖，具体业务调整根据自己需要来哈~

import { defineStore } from "pinia";
import ColorUnit from "@/unit/ColorUnit";export const useColorStore = defineStore("color", () => {function setThemeColor(colorMap) {let _namespace = "el";colorMap.forEach((colorItem) => {setPropertyColor(`--${_namespace}-color-${colorItem[0]}`, colorItem[1]);themeColorGradient(`--${_namespace}-color-${colorItem[0]}-light-#level#`,"lighten",colorItem[1]);setPropertyColor(`--${_namespace}-color-${colorItem[0]}-dark-2`,colorItem[1],"darken");// themeColorGradient(`--${_namespace}-color-${colorItem[0]}-dark-#level#`,"darken",colorItem[1]);});}/*** 将css3变量设置到document中方便全局调用*/function setPropertyColor(varName, color, funName, level) {level = level ? level : 0;funName = funName ? funName : "lighten";document.documentElement.style.setProperty(varName,ColorUnit[funName](color, level / 10));}/*** 生成主色的其余渐变色并修改对应CSS3变量值*/function themeColorGradient(varName, funName, themeColor, themeLevel) {themeColor = themeColor ? themeColor : '#409eff';themeLevel = themeLevel ? themeLevel : [3, 5, 7, 8, 9];themeLevel.forEach(function (level) {setPropertyColor(varName.replace("#level#", level),themeColor,funName,level);});}return {setThemeColor,};
});

颜色编码生成工具

根据前言描述，我们得知，需要根据一个十六进制的色值，生成其余的渐变色值出来，手动配置的话就太麻烦了
所以我们先来封装一个ColorUnit工具来辅助我们进行色调的配置

// file: src/unit/ColorUnit.js
// 代码载取来至：https://gitee.com/lolicode/scui/blob/master/src/utils/color.js
export default {//hex颜色转rgb颜色HexToRgb(str) {str = str.replace("#", "")var hxs = str.match(/../g)for (var i = 0; i < 3; i++) hxs[i] = parseInt(hxs[i], 16)return hxs},//rgb颜色转hex颜色RgbToHex(a, b, c) {var hexs = [a.toString(16), b.toString(16), c.toString(16)]for (var i = 0; i < 3; i++) {if (hexs[i].length == 1) hexs[i] = "0" + hexs[i]}return "#" + hexs.join("");},//加深darken(color, level) {var rgbc = this.HexToRgb(color)for (var i = 0; i < 3; i++) rgbc[i] = Math.floor(rgbc[i] * (1 - level))return this.RgbToHex(rgbc[0], rgbc[1], rgbc[2])},//变淡lighten(color, level) {var rgbc = this.HexToRgb(color)for (var i = 0; i < 3; i++) rgbc[i] = Math.floor((255 - rgbc[i]) * level + rgbc[i])return this.RgbToHex(rgbc[0], rgbc[1], rgbc[2])}
}

整合

有了上面俩个帮手，现在整合起来的具体应用

template部分

<template><main><el-row style="margin-bottom: 15px"><div class="demo-color-warp"><div class="demo-color-box" v-for="(item, key) in _theme" :key="key"@click="setThemeColor(item.color, item.label)":style="{'--color':item.color[0][1]}"><span class="demo-color__label">{{ item.label }}</span><span class="demo-color__value">{{ item.color[0][0] }}</span><span class="demo-color__value">{{ item.color[0][1] }}</span><ul class="demo-color__list"><template v-for="(colorItem, colorKey) in item.color" :key="colorKey"><li v-if="colorKey>0" :style="{'--color':colorItem[1]}">
<!--                <span>{{ colorItem[0] }}</span>-->
<!--                <span>{{ colorItem[1] }}</span>--></li></template></ul></div></div><span>当前主题：{{ themeName }}</span></el-row><el-row class="mb-4"><el-button>Default</el-button><el-button type="primary">Primary</el-button><el-button type="success">Success</el-button><el-button type="info">Info</el-button><el-button type="warning">Warning</el-button><el-button type="danger">Danger</el-button></el-row><el-row class="mb-4"><el-button plain>Plain</el-button><el-button type="primary" plain>Primary</el-button><el-button type="success" plain>Success</el-button><el-button type="info" plain>Info</el-button><el-button type="warning" plain>Warning</el-button><el-button type="danger" plain>Danger</el-button></el-row><el-row class="mb-4"><el-button round>Round</el-button><el-button type="primary" round>Primary</el-button><el-button type="success" round>Success</el-button><el-button type="info" round>Info</el-button><el-button type="warning" round>Warning</el-button><el-button type="danger" round>Danger</el-button></el-row><el-row><el-button :icon="Search" circle /><el-button type="primary" :icon="Edit" circle /><el-button type="success" :icon="Check" circle /><el-button type="info" :icon="Message" circle /><el-button type="warning" :icon="Star" circle /><el-button type="danger" :icon="Delete" circle /></el-row></main>
</template>

script部分

<script setup>
import {ref} from "vue"
import { useColorStore } from "@/stores/color";
// ...
const themeName = ref('默认主题');
const colorStore = useColorStore();
// ...
let _theme = [{label:'默认主题', color:[["primary", "#409EFF"], ["success", "#67C23A"], ["warning", "#E6A23C"], ["danger", "#F56C6C"], ["error", "#F56C6C"], ["info", "#909399"]]},{label:'自定义主题1', color:[["primary", "#1984f3"], ["success", "#55DE12"], ["warning", "#EA9412"], ["danger", "#E12020"], ["error", "#E12020"], ["info", "#209399"]]},{label:'自定义主题2', color:[["primary", "#0A4680"], ["success", "#276409"], ["warning", "#815410"], ["danger", "#931d1d"], ["error", "#931D1D"], ["info", "#454A55"]]},
];
// ...
function setThemeColor(colorMap, label) {themeName.value = label;colorStore.setThemeColor(colorMap);
}
// ...
</script>