141 lines
4.3 KiB
JavaScript
141 lines
4.3 KiB
JavaScript
import { throttle } from 'lodash'
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import { mapState } from 'vuex'
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import menuMixin from '../mixin/menu'
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import { createMenu } from '../libs/util.menu'
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export default {
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name: 'd2-layout-header-aside-menu-header',
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mixins: [
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menuMixin
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],
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render (h) {
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return <div
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flex="cross:center"
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class={ { 'd2-theme-header-menu': true, 'is-scrollable': this.isScroll } }
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ref="page">
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<div
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ref="content"
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class="d2-theme-header-menu__content"
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flex-box="1"
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flex>
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<div
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class="d2-theme-header-menu__scroll"
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flex-box="0"
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style={ { transform: `translateX(${this.currentTranslateX}px)` } }
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ref="scroll">
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<el-menu
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mode="horizontal"
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defaultActive={ this.active }
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onSelect={ this.handleMenuSelect }>
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{ this.header.map(menu => createMenu.call(this, h, menu)) }
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</el-menu>
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</div>
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</div>
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{
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this.isScroll
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? [
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<div
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class="d2-theme-header-menu__prev"
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flex="main:center cross:center"
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flex-box="0"
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onClick={ () => this.scroll('left') }>
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<i class="el-icon-arrow-left"></i>
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</div>,
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<div
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class="d2-theme-header-menu__next"
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flex="main:center cross:center"
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flex-box="0"
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onClick={ () => this.scroll('right') }>
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<i class="el-icon-arrow-right"></i>
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</div>
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]
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: []
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}
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</div>
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},
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computed: {
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...mapState('d2admin/menu', [
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'header'
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])
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},
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data () {
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return {
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active: '',
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isScroll: false,
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scrollWidth: 0,
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contentWidth: 0,
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currentTranslateX: 0,
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throttledCheckScroll: null
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}
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},
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watch: {
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'$route.matched': {
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handler (val) {
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this.active = val[val.length - 1].path
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},
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immediate: true
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}
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},
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methods: {
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scroll (direction) {
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if (direction === 'left') {
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// 向右滚动
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this.currentTranslateX = 0
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} else {
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// 向左滚动
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if (this.contentWidth * 2 - this.currentTranslateX <= this.scrollWidth) {
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this.currentTranslateX -= this.contentWidth
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} else {
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this.currentTranslateX = this.contentWidth - this.scrollWidth
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}
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}
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},
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checkScroll () {
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let contentWidth = this.$refs.content.clientWidth
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let scrollWidth = this.$refs.scroll.clientWidth
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if (this.isScroll) {
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// 页面依旧允许滚动的情况，需要更新width
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if (this.contentWidth - this.scrollWidth === this.currentTranslateX) {
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// currentTranslateX 也需要相应变化【在右端到头的情况时】
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this.currentTranslateX = contentWidth - scrollWidth
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// 快速的滑动依旧存在判断和计算时对应的contentWidth变成正数，所以需要限制一下
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if (this.currentTranslateX > 0) {
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this.currentTranslateX = 0
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}
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}
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// 更新元素数据
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this.contentWidth = contentWidth
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this.scrollWidth = scrollWidth
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// 判断何时滚动消失: 当scroll > content
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if (contentWidth > scrollWidth) {
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this.isScroll = false
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}
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}
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// 判断何时滚动出现: 当scroll < content
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if (!this.isScroll && contentWidth < scrollWidth) {
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this.isScroll = true
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// 注意，当isScroll变为true，对应的元素盒子大小会发生变化
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this.$nextTick(() => {
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contentWidth = this.$refs.content.clientWidth
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scrollWidth = this.$refs.scroll.clientWidth
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this.contentWidth = contentWidth
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this.scrollWidth = scrollWidth
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this.currentTranslateX = 0
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})
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}
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}
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},
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mounted () {
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// 初始化判断
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// 默认判断父元素和子元素的大小，以确定初始情况是否显示滚动
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this.checkScroll()
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// 全局窗口变化监听，判断父元素和子元素的大小，从而控制isScroll的开关
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this.throttledCheckScroll = throttle(this.checkScroll, 300)
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window.addEventListener('resize', this.throttledCheckScroll)
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},
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beforeDestroy () {
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// 取消监听
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window.removeEventListener('resize', this.throttledCheckScroll)
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}
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}
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