vue+element实现自定义主题功能

心已赠人 2021-12-05 20:57 598阅读 0赞

1.  第一步按照element官网介绍安装依赖

npm i element-theme -g
    		npm i element-theme-chalk -D

执行代码 et -i 根目录会生成element-variables.scss文件  
修改$–color-primary：你喜欢的颜色值执行et 然后你就会看到theme文件夹下的font文件了

1.  main.js中引入`import '../theme/index.css'`
2.  封装组件名为ThemePicker 代码如下

<template>
    			  <el-color-picker
    			    class="theme-picker"
    			    popper-class="theme-picker-dropdown"
    			    v-model="theme"
    			    :size="size">
    			  </el-color-picker>
    			</template>
    			
    			<script>
    			
    			const version = require('element-ui/package.json').version // element-ui version from node_modules
    			const ORIGINAL_THEME = '#409EFF' // default color
    			export default {
    			  name: 'ThemePicker',
    			  props: {
    			    default: { // 初始化主题，可由外部传入
    			      type: String,
    			      //default: '#EB815B'
    			      default: ""+localStorage.getItem("tremePackers")+""
    			    },
    			    size: { // 初始化主题，可由外部传入
    			      type: String,
    			      default: 'small'
    			    }
    			  },
    			  data() {
    			    return {
    			      chalk: '', // content of theme-chalk css
    			      theme: ORIGINAL_THEME,
    			      showSuccess: true, // 是否弹出换肤成功消息
    			    }
    			  },
    			  mounted() {
    			    if(this.default != null) {
    			      this.theme = this.default
    			      this.$emit('onThemeChange', this.theme)
    			      this.showSuccess = false
    			    }
    			  },
    			  watch: {
    			    theme(val, oldVal) {
    			      if (typeof val !== 'string') return
    			      const themeCluster = this.getThemeCluster(val.replace('#', ''))
    			      const originalCluster = this.getThemeCluster(oldVal.replace('#', ''))
    			      const getHandler = (variable, id) => {
    			        return () => {
    			          const originalCluster = this.getThemeCluster(ORIGINAL_THEME.replace('#', ''))
    			          const newStyle = this.updateStyle(this[variable], originalCluster, themeCluster)
    			
    			          let styleTag = document.getElementById(id)
    			          if (!styleTag) {
    			            styleTag = document.createElement('style')
    			            styleTag.setAttribute('id', id)
    			            document.head.appendChild(styleTag)
    			          }
    			          styleTag.innerText = newStyle
    			        }
    			      }
    			
    			      const chalkHandler = getHandler('chalk', 'chalk-style')
    			
    			      if (!this.chalk) {
    			        const url = `https://unpkg.com/element-ui@${version}/lib/theme-chalk/index.css`
    			        this.getCSSString(url, chalkHandler, 'chalk')
    			      } else {
    			        chalkHandler()
    			      }
    			
    			      const styles = [].slice.call(document.querySelectorAll('style'))
    			        .filter(style => {
    			          const text = style.innerText
    			          return new RegExp(oldVal, 'i').test(text) && !/Chalk Variables/.test(text)
    			        })
    			      styles.forEach(style => {
    			        const { innerText } = style
    			        if (typeof innerText !== 'string') return
    			        style.innerText = this.updateStyle(innerText, originalCluster, themeCluster)
    			      })
    			
    			      // 响应外部操作
    			      this.$emit('onThemeChange', val)
    			      //存入localStorage
    			      localStorage.setItem('tremePackers',val);
    			      if(this.showSuccess) {
    			        this.$message({
    			          message: '换肤成功',
    			          type: 'success'
    			        })
    			      } else {
    			        this.showSuccess = true
    			      }
    			    }
    			  },
    			  methods: {
    			    updateStyle(style, oldCluster, newCluster) {
    			      let newStyle = style
    			      oldCluster.forEach((color, index) => {
    			        newStyle = newStyle.replace(new RegExp(color, 'ig'), newCluster[index])
    			      })
    			      return newStyle
    			    },
    			
    			    getCSSString(url, callback, variable) {
    			      const xhr = new XMLHttpRequest()
    			      xhr.onreadystatechange = () => {
    			        if (xhr.readyState === 4 && xhr.status === 200) {
    			          this[variable] = xhr.responseText.replace(/@font-face{[^}]+}/, '')
    			          callback()
    			        }
    			      }
    			      xhr.open('GET', url)
    			      xhr.send()
    			    },
    			
    			    getThemeCluster(theme) {
    			      const tintColor = (color, tint) => {
    			        let red = parseInt(color.slice(0, 2), 16)
    			        let green = parseInt(color.slice(2, 4), 16)
    			        let blue = parseInt(color.slice(4, 6), 16)
    			
    			        if (tint === 0) { // when primary color is in its rgb space
    			          return [red, green, blue].join(',')
    			        } else {
    			          red += Math.round(tint * (255 - red))
    			          green += Math.round(tint * (255 - green))
    			          blue += Math.round(tint * (255 - blue))
    			
    			          red = red.toString(16)
    			          green = green.toString(16)
    			          blue = blue.toString(16)
    			
    			          return `#${red}${green}${blue}`
    			        }
    			      }
    			
    			      const shadeColor = (color, shade) => {
    			        let red = parseInt(color.slice(0, 2), 16)
    			        let green = parseInt(color.slice(2, 4), 16)
    			        let blue = parseInt(color.slice(4, 6), 16)
    			
    			        red = Math.round((1 - shade) * red)
    			        green = Math.round((1 - shade) * green)
    			        blue = Math.round((1 - shade) * blue)
    			
    			        red = red.toString(16)
    			        green = green.toString(16)
    			        blue = blue.toString(16)
    			
    			        return `#${red}${green}${blue}`
    			      }
    			
    			      const clusters = [theme]
    			      for (let i = 0; i <= 9; i++) {
    			        clusters.push(tintColor(theme, Number((i / 10).toFixed(2))))
    			      }
    			      clusters.push(shadeColor(theme, 0.1))
    			      return clusters
    			    }
    			  }
    			}
    			</script>
    			
    			<style>
    			.theme-picker .el-color-picker__trigger {
    			  vertical-align: middle;
    			}
    			
    			.theme-picker-dropdown .el-color-dropdown__link-btn {
    			  display: none;
    			}
    			</style>

4.页面中使用

<template>
        <theme-picker  class="right-menu-item" style="padding-top:10px;" @change="themeChange" />
    </template>
    <script>
    import ThemePicker from '@/components/ThemePicker'
    
    export default {
      components: {
        ThemePicker
      },
    
      data() {
          return {
            
          };
      },
      methods: {
         themeChange(val) {
          this.$store.dispatch('settings/changeSetting', {
            key: 'theme',
            value: val
          })
        },
      }
    }
    </script>

//最后自己再调一下样式什么的就可以了