<template>
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<!-- 支付宝小程序使用_tGetRect()获取组件的根元素尺寸，所以在外面套一个"壳" -->
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<view>
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<view class="tn-index-list-class tn-index-list">
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<slot></slot>
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<!-- 侧边栏 -->
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<view
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v-if="showSidebar"
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class="tn-index-list__sidebar"
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@touchstart.stop.prevent="onTouchMove"
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@touchmove.stop.prevent="onTouchMove"
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@touchend.stop.prevent="onTouchStop"
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@touchcancel.stop.prevent="onTouchStop"
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>
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<view
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v-for="(item, index) in indexList"
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:key="index"
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class="tn-index-list__sidebar__item"
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:style="{
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zIndex: zIndex + 1,
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color: activeAnchorIndex === index ? activeColor : ''
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}"
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>
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{{ item }}
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</view>
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</view>
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<!-- 选中弹出框 -->
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<view
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v-if="touchMove && indexList[touchMoveIndex]"
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class="tn-index-list__alert"
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:style="{
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zIndex: selectAlertZIndex
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}"
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>
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<text>{{ indexList[touchMoveIndex] }}</text>
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</view>
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</view>
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</view>
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</template>
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<script>
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// 生成 A-Z的字母列表
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let indexList = function() {
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let indexList = []
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let charCodeOfA = 'A'.charCodeAt(0)
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for (var i = 0; i < 26; i++) {
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indexList.push(String.fromCharCode(charCodeOfA + i))
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}
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return indexList
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}
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export default {
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name: 'tn-index-list',
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props: {
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// 索引列表
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indexList: {
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type: Array,
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default() {
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return indexList()
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}
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},
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// 是否自动吸顶
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sticky: {
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type: Boolean,
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default: true
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},
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// 自动吸顶时距离顶部的距离，单位px
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stickyTop: {
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type: Number,
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default: 0
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},
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// 自定义顶栏的高度，单位px
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customBarHeight: {
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type: Number,
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default: 0
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},
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// 当前滚动的高度
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// 由于自定义组件无法获取滚动高度，所以依赖传入
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scrollTop: {
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type: Number,
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default: 0
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},
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// 选中索引时的颜色
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activeColor: {
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type: String,
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default: '#01BEFF'
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},
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// 吸顶时的z-index
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zIndex: {
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type: Number,
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default: 0
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}
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},
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computed: {
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// 选中索引列表弹出提示框的z-index
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selectAlertZIndex() {
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return this.$t.zIndex.toast
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},
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// 吸顶的偏移高度
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stickyOffsetTop() {
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// #ifdef H5
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return this.stickyTop !== '' ? this.stickyTop : 44
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// #endif
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// #ifndef H5
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return this.stickyTop !== '' ? this.stickyTop : 0
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// #endif
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}
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},
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data() {
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return {
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// 当前激活的列表锚点的序号
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activeAnchorIndex: 0,
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// 显示侧边索引栏
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showSidebar: true,
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// 标记是否开始触摸移动
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touchMove: false,
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// 当前触摸移动到对应索引的序号
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touchMoveIndex: 0,
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// 滚动到对应锚点的序号
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scrollToAnchorIndex: 0,
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// 侧边栏的信息
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sidebar: {
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height: 0,
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top: 0
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},
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// 内容区域高度
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height: 0,
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// 内容区域top
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top: 0
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}
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},
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watch: {
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scrollTop() {
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this.updateData()
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}
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},
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created() {
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// 只能在created生命周期定义childrens，如果在data定义，会因为循环引用而报错
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this.childrens = []
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},
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methods: {
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// 更新数据
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updateData() {
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this.timer && clearTimeout(this.timer)
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this.timer = setTimeout(() => {
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this.showSidebar = !!this.childrens.length
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this.getRect().then(() => {
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this.onScroll()
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})
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}, 0)
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},
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// 获取对应的信息
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getRect() {
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return Promise.all([
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this.getAnchorRect(),
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this.getListRect(),
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this.getSidebarRect()
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])
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},
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// 获取列表内容子元素信息
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getAnchorRect() {
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return Promise.all(this.childrens.map((child, index) => {
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child._tGetRect('.tn-index-anchor__wrap').then((rect) => {
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Object.assign(child, {
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height: rect.height,
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top: rect.top - this.customBarHeight
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})
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})
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}))
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},
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// 获取列表信息
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getListRect() {
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return this._tGetRect('.tn-index-list').then(rect => {
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Object.assign(this, {
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height: rect.height,
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top: rect.top + this.scrollTop
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})
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})
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},
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// 获取侧边滚动栏信息
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getSidebarRect() {
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return this._tGetRect('.tn-index-list__sidebar').then(rect => {
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this.sidebar = {
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height: rect.height,
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top: rect.top
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}
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})
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},
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// 滚动事件
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onScroll() {
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const {
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childrens = []
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} = this
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if (!childrens.length) {
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return
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}
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const {
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sticky,
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stickyOffsetTop,
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zIndex,
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scrollTop,
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activeColor
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} = this
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const active = this.getActiveAnchorIndex()
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this.activeAnchorIndex = active
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if (sticky) {
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let isActiveAnchorSticky = false
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if (active !== -1) {
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isActiveAnchorSticky = childrens[active].top <= 0
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}
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childrens.forEach((item, index) => {
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if (index === active) {
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let wrapperStyle = ''
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let anchorStyle = {
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color: `${activeColor}`
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}
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if (isActiveAnchorSticky) {
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wrapperStyle = {
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height: `${childrens[index].height}px`
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}
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anchorStyle = {
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position: 'fixed',
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top: `${stickyOffsetTop}px`,
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zIndex: `${zIndex ? zIndex : this.$t.zIndex.indexListSticky}`,
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color: `${activeColor}`
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}
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}
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item.active = true
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item.wrapperStyle = wrapperStyle
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item.anchorStyle = anchorStyle
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} else if (index === active - 1) {
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const currentAnchor = childrens[index]
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const currentOffsetTop = currentAnchor.top
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const targetOffsetTop = index === childrens.length - 1 ? this.top : childrens[index + 1].top
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const parentOffsetHeight = targetOffsetTop - currentOffsetTop
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const translateY = parentOffsetHeight - currentAnchor.height
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const anchorStyle = {
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position: 'relative',
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transform: `translate3d(0, ${translateY}px, 0)`,
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zIndex: `${zIndex ? zIndex : this.$t.zIndex.indexListSticky}`,
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color: `${activeColor}`
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}
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item.active = false
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item.anchorStyle = anchorStyle
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} else {
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item.active = false
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item.wrapperStyle = ''
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item.anchorStyle = ''
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}
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})
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}
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},
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// 触摸移动
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onTouchMove(event) {
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this.touchMove = true
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const sidebarLength = this.childrens.length
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const touch = event.touches[0]
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const itemHeight = this.sidebar.height / sidebarLength
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let clientY = touch.clientY
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let index = Math.floor((clientY - this.sidebar.top) / itemHeight)
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if (index < 0) {
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index = 0
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} else if (index > sidebarLength - 1) {
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index = sidebarLength - 1
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}
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this.touchMoveIndex = index
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this.scrollToAnchor(index)
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},
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// 触摸停止
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onTouchStop() {
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this.touchMove = false
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this.scrollToAnchorIndex = null
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},
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// 获取当前的锚点序号
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getActiveAnchorIndex() {
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const {
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childrens,
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sticky
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} = this
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for (let i = this.childrens.length - 1; i >= 0; i--) {
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const preAnchorHeight = i > 0 ? childrens[i - 1].height : 0
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const reachTop = sticky ? preAnchorHeight : 0
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if (reachTop >= childrens[i].top) {
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return i
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}
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}
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return -1
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},
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// 滚动到对应的锚点
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scrollToAnchor(index) {
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if (this.scrollToAnchorIndex === index) {
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return
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}
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this.scrollToAnchorIndex = index
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const anchor = this.childrens.find(item => item.index === this.indexList[index])
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if (anchor) {
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const scrollTop = anchor.top + this.scrollTop
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this.$emit('select', {
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index: anchor.index,
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scrollTop: scrollTop
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})
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uni.pageScrollTo({
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duration:0,
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scrollTop: scrollTop
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})
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}
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}
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}
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}
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</script>
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<style lang="scss" scoped>
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.tn-index-list {
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position: relative;
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&__sidebar {
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display: flex;
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flex-direction: column;
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position: fixed;
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top: 50%;
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right: 0;
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text-align: center;
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transform: translateY(-50%);
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user-select: none;
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z-index: 99;
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&__item {
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font-weight: 500;
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padding: 8rpx 18rpx;
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font-size: 22rpx;
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line-height: 1;
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}
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}
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&__alert {
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display: flex;
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flex-direction: row;
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position: fixed;
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width: 120rpx;
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height: 120rpx;
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top: 50%;
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right: 90rpx;
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align-items: center;
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justify-content: center;
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margin-top: -60rpx;
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border-radius: 24rpx;
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font-size: 50rpx;
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color: #FFFFFF;
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background-color: $tn-font-sub-color;
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padding: 0;
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z-index: 9999999;
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text {
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line-height: 50rpx;
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}
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}
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}
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</style>
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