<template>
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<el-color-picker
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v-model="theme"
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:predefine="['#409EFF', '#11a983', '#13c2c2', '#6959CD', '#f5222d', '#eb2f96', '#DB7093', '#e6a23c', '#8B8989', '#212121']"
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class="theme-picker"
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popper-class="theme-picker-dropdown"
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/>
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</template>
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<script>
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const version = require('element-ui/package.json').version // element-ui version from node_modules
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const ORIGINAL_THEME = '#409EFF' // default color
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export default {
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data() {
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return {
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chalk: '', // content of theme-chalk css
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theme: ORIGINAL_THEME
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}
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},
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watch: {
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theme(val) {
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const oldVal = this.theme
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if (typeof val !== 'string') return
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const themeCluster = this.getThemeCluster(val.replace('#', ''))
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const originalCluster = this.getThemeCluster(oldVal.replace('#', ''))
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console.log(themeCluster, originalCluster)
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const getHandler = (variable, id) => {
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return () => {
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const originalCluster = this.getThemeCluster(ORIGINAL_THEME.replace('#', ''))
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const newStyle = this.updateStyle(this[variable], originalCluster, themeCluster)
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let styleTag = document.getElementById(id)
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if (!styleTag) {
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styleTag = document.createElement('style')
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styleTag.setAttribute('id', id)
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document.head.appendChild(styleTag)
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}
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styleTag.innerText = newStyle
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}
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}
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const chalkHandler = getHandler('chalk', 'chalk-style')
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if (!this.chalk) {
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const url = `https://unpkg.com/element-ui@${version}/lib/theme-chalk/index.css`
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this.getCSSString(url, chalkHandler, 'chalk')
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} else {
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chalkHandler()
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}
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const styles = [].slice.call(document.querySelectorAll('style'))
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.filter(style => {
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const text = style.innerText
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return new RegExp(oldVal, 'i').test(text) && !/Chalk Variables/.test(text)
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})
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styles.forEach(style => {
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const { innerText } = style
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if (typeof innerText !== 'string') return
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style.innerText = this.updateStyle(innerText, originalCluster, themeCluster)
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})
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this.$message({
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message: '换肤成功',
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type: 'success'
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})
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}
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},
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methods: {
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updateStyle(style, oldCluster, newCluster) {
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const colorOverrides = [] // only capture color overides
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oldCluster.forEach((color, index) => {
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const value = newCluster[index]
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const color_plain = color.replace(/([()])/g, '\\$1')
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const repl = new RegExp(`(^|})([^{]+{[^{}]+)${color_plain}\\b([^}]*)(?=})`, 'gi')
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const nestRepl = new RegExp(color_plain, 'ig') // for greed matching before the 'color'
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let v
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while ((v = repl.exec(style))) {
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colorOverrides.push(v[2].replace(nestRepl, value) + value + v[3] + '}') // '}' not captured in the regexp repl to reserve it as locator-boundary
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}
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})
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return colorOverrides.join('')
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},
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getCSSString(url, callback, variable) {
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const xhr = new XMLHttpRequest()
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xhr.onreadystatechange = () => {
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if (xhr.readyState === 4 && xhr.status === 200) {
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this[variable] = xhr.responseText.replace(/@font-face{[^}]+}/, '')
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callback()
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}
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}
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xhr.open('GET', url)
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xhr.send()
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},
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getThemeCluster(theme) {
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const tintColor = (color, tint) => {
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let red = parseInt(color.slice(0, 2), 16)
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let green = parseInt(color.slice(2, 4), 16)
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let blue = parseInt(color.slice(4, 6), 16)
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if (tint === 0) { // when primary color is in its rgb space
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return [red, green, blue].join(',')
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} else {
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red += Math.round(tint * (255 - red))
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green += Math.round(tint * (255 - green))
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blue += Math.round(tint * (255 - blue))
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red = red.toString(16)
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green = green.toString(16)
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blue = blue.toString(16)
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return `#${red}${green}${blue}`
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}
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}
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const shadeColor = (color, shade) => {
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let red = parseInt(color.slice(0, 2), 16)
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let green = parseInt(color.slice(2, 4), 16)
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let blue = parseInt(color.slice(4, 6), 16)
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red = Math.round((1 - shade) * red)
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green = Math.round((1 - shade) * green)
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blue = Math.round((1 - shade) * blue)
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red = red.toString(16)
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green = green.toString(16)
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blue = blue.toString(16)
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return `#${red}${green}${blue}`
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}
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const clusters = [theme]
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for (let i = 0; i <= 9; i++) {
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clusters.push(tintColor(theme, Number((i / 10).toFixed(2))))
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}
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clusters.push(shadeColor(theme, 0.1))
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return clusters
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}
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}
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}
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</script>
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<style>
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.theme-picker .el-color-picker__trigger {
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margin-top: 12px;
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height: 26px!important;
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width: 26px!important;
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padding: 2px;
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}
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.theme-picker-dropdown .el-color-dropdown__link-btn {
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display: none;
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}
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</style>
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