import { mapGetters } from 'vuex'
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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 function() {
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return {
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data() {
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return {
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themeVal: ORIGINAL_THEME
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}
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},
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created() {
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this.themeVal = this.theme
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},
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watch: {
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themeVal(val, oldVal) {
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this.$store.commit('SET_THEME', val)
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this.updateTheme(val, oldVal)
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}
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},
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computed: {
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...mapGetters(['theme'])
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},
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methods: {
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updateTheme(val, oldVal) {
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if (typeof val !== 'string') return
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const head = document.getElementsByTagName('head')[0]
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const themeCluster = this.getThemeCluster(val.replace('#', ''))
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const originalCluster = this.getThemeCluster(oldVal.replace('#', ''))
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const getHandler = (variable, id) => {
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return () => {
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const originalCluster = this.getThemeCluster(
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ORIGINAL_THEME.replace('#', '')
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)
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const newStyle = this.updateStyle(
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this[variable],
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originalCluster,
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themeCluster
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)
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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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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 link = [].slice.call(
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document.getElementsByTagName('head')[0].getElementsByTagName('link')
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)
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for (let i = 0; i < link.length; i++) {
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const style = link[i]
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if (style.href.includes('css')) {
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this.getCSSString(style.href, innerText => {
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const originalCluster = this.getThemeCluster(
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ORIGINAL_THEME.replace('#', '')
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)
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const newStyle = this.updateStyle(
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innerText,
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originalCluster,
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themeCluster
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)
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let styleTag = document.getElementById(i)
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if (!styleTag) {
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styleTag = document.createElement('style')
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styleTag.id = i
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styleTag.innerText = newStyle
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head.appendChild(styleTag)
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}
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})
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}
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}
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const styles = [].slice.call(document.querySelectorAll('style'))
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styles.forEach(style => {
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const {
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innerText
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} = style
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if (typeof innerText !== 'string') return
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style.innerText = this.updateStyle(
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innerText,
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originalCluster,
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themeCluster
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)
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})
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},
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updateStyle(style, oldCluster, newCluster) {
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let newStyle = style
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oldCluster.forEach((color, index) => {
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newStyle = newStyle.replace(new RegExp(color, 'ig'), newCluster[index])
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})
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return newStyle
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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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if (variable) {
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this[variable] = xhr.responseText.replace(/@font-face{[^}]+}/, '')
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}
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callback(xhr.responseText)
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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) {
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// 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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}
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