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src/components/ThemePicker/index.vue
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<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
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: null
},
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.$emit('onThemeChange', this.theme)
this.showSuccess = false
}
},
watch: {
theme(val, oldVal) {
if (typeof val !== 'string') return
// 替换CSS样式，修改主题色
const themeCluster = this.getThemeCluster(val.replace('#', ''))
const originalCluster = this.getThemeCluster(oldVal.replace('#', ''))
console.log(themeCluster, originalCluster)
const getHandler = (variable, id) => {
return () => {
const originalCluster = this.getThemeCluster(ORIGINAL_THEME.replace('#', ''))
const newStyle = this.updateStyle(this[variable], originalCluster, themeCluster)
let styleTag = document.getElementById(id)
if (!styleTag) {
styleTag = document.createElement('style')
styleTag.setAttribute('id', id)
document.head.appendChild(styleTag)
}
styleTag.innerText = newStyle
}
}
const chalkHandler = getHandler('chalk', 'chalk-style')
if (!this.chalk) {
const url = `https://unpkg.com/element-ui@${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.$emit('onThemeChange', val)
if(this.showSuccess) {
this.$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>
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