目錄

• 自定義主題
  • 1.安裝「主題生成工具」
  • 2.安裝白堊主題
  • 3.新建顏色挑選元件

自定義主題

1.安裝「主題生成工具」

由於主題工具需要依賴於 node-sass,而node-sass版本相容性並不好，對應 node 版本可能不相容直接執行npm i element-theme -g所安裝的版本，因此需要自行先安裝對應 node 版本的node-sass.

對應版本如下

因為我這裡的 node 版本是 12.18.1

# 先安裝node-sass
set SASS_BINARY_SITE=https://npm.taobao.org/mirrors/node-sass/

npm install [email protected] --save

npm i element-theme -g

特別說明： 若出現 gyp verb check python checking for Python executable "python" in the PATH

npm install -g node-gyp
npm install --global --production windows-build-tools

2.安裝白堊主題

可以從 npm 安裝或者從 GitHub 拉取最新程式碼。

# 從 npm
npm i element-theme-chalk -D

# 從 GitHub
npm i https://github.com/ElementUI/theme-chalk -D

3.新建顏色挑選元件

注意:ORIGINAL_THEME 值不能改變，否則預設按鈕顏色不會改變。

程式碼如下：

<template>
    <el-tooltip effect="dark" content="換膚" placement="bottom">
        <el-color-picker class="theme-picker" popper-class="theme-picker-dropdown" v-model="theme" :size="size"> </el-color-picker>
    </el-tooltip>
</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: {
            // 初始化主題，可由外部傳入
            type: String,
            default: null,
        },
        size: {
            // 初始化主題，可由外部傳入
            type: String,
            default: 'small',
        },
    },
    data() {
        return {
            chalk: '', // content of theme-chalk css
            theme: ORIGINAL_THEME,
            showSuccess: true, // 是否彈出換膚成功訊息
        }
    },
    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)
            })

            // 響應外部操作
            this.$emit('onThemeChange', val)
            if (this.showSuccess) {
                this.$message({
                    message: '換膚成功',
                    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>
 

然後在 vuex 對應 vue 模組中，新增顏色管理的狀態值。

在 頭部新增 顏色選擇的元件，供全域性選擇，程式碼如下：

import ThemePicker from '@/components/ThemePicker'
//引入元件
components: { ThemePicker },

//使用
<theme-picker
:default="themeColor"
@onThemeChange="onThemeChange">
</theme-picker>


methods: {
     // 切換主題方法
     onThemeChange (themeColor)
    {
         this.$store.commit("setThemeColor", themeColor);
    }
} //將顏色用狀態管理器管理。

在每次顏色改變時，設定到 state.themeColor 上，在各個需要改變面板的地方，從 state 中取出來，然後賦值進去。

原文地址：http://book.levy.net.cn/doc/frontend/uiframe/custom_theme.html