448 lines
13 KiB
Vue
448 lines
13 KiB
Vue
<template>
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<view class="u-index-list">
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<!-- #ifdef APP-NVUE -->
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<list
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:scrollTop="scrollTop"
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enable-back-to-top
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:offset-accuracy="1"
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:style="{
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maxHeight: addUnit(scrollViewHeight)
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}"
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@scroll="scrollHandler"
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ref="uList"
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>
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<cell
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v-if="$slots.header"
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ref="header"
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>
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<slot name="header" />
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</cell>
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<slot />
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<cell v-if="$slots.footer">
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<slot name="footer" />
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</cell>
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</list>
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<!-- #endif -->
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<!-- #ifndef APP-NVUE -->
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<scroll-view
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:scrollTop="scrollTop"
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:scrollIntoView="scrollIntoView"
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:offset-accuracy="1"
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:style="{
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maxHeight: addUnit(scrollViewHeight)
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}"
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scroll-y
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@scroll="scrollHandler"
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ref="uList"
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>
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<view v-if="$slots.header">
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<slot name="header" />
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</view>
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<slot />
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<view v-if="$slots.footer">
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<slot name="footer" />
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</view>
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</scroll-view>
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<!-- #endif -->
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<view
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class="u-index-list__letter"
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ref="u-index-list__letter"
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:style="{ top: addUnit(letterInfo.top || 100) }"
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@touchstart.prevent="touchStart"
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@touchmove.prevent="touchMove"
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@touchend.prevent="touchEnd"
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@touchcancel.prevent="touchEnd"
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>
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<view
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class="u-index-list__letter__item"
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v-for="(item, index) in uIndexList"
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:key="index"
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:style="{
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backgroundColor: activeIndex === index ? activeColor : 'transparent'
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}"
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>
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<text
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class="u-index-list__letter__item__index"
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:style="{color: activeIndex === index ? '#fff' : inactiveColor}"
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>{{ item }}</text>
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</view>
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</view>
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<u-transition
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mode="fade"
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:show="touching"
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:customStyle="{
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position: 'fixed',
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right: '50px',
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top: addUnit(indicatorTop),
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zIndex: 2
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}"
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>
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<view
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class="u-index-list__indicator"
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:class="['u-index-list__indicator--show']"
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:style="{
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height: addUnit(indicatorHeight),
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width: addUnit(indicatorHeight)
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}"
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>
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<text class="u-index-list__indicator__text">{{ uIndexList[activeIndex] }}</text>
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</view>
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</u-transition>
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</view>
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</template>
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<script>
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const indexList = () => {
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const indexList = [];
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const charCodeOfA = 'A'.charCodeAt(0);
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for (let 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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import props from './props';
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import mpMixin from '../../libs/mixin/mpMixin';
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import mixin from '../../libs/mixin/mixin';
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import { addUnit, sys, sleep, getPx } from '../../libs/function/index';
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// #ifdef APP-NVUE
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// 由于weex为阿里的KPI业绩考核的产物，所以不支持百分比单位，这里需要通过dom查询组件的宽度
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const dom = uni.requireNativePlugin('dom')
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// #endif
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/**
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* IndexList 索引列表
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* @description 通过折叠面板收纳内容区域
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* @tutorial https://uview-plus.jiangruyi.com/components/indexList.html
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* @property {String} inactiveColor 右边锚点非激活的颜色 ( 默认 '#606266' )
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* @property {String} activeColor 右边锚点激活的颜色 ( 默认 '#5677fc' )
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* @property {Array} indexList 索引字符列表，数组形式
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* @property {Boolean} sticky 是否开启锚点自动吸顶 ( 默认 true )
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* @property {String | Number} customNavHeight 自定义导航栏的高度 ( 默认 0 )
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* */
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export default {
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name: 'u-index-list',
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mixins: [mpMixin, mixin, props],
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// #ifdef MP-WEIXIN
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// 将自定义节点设置成虚拟的，更加接近Vue组件的表现，能更好的使用flex属性
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options: {
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virtualHost: true
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},
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// #endif
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data() {
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return {
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// 当前正在被选中的字母索引
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activeIndex: -1,
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touchmoveIndex: 1,
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// 索引字母的信息
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letterInfo: {
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height: 0,
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itemHeight: 0,
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top: 0
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},
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// 设置字母指示器的高度，后面为了让指示器跟随字母，并将尖角部分指向字母的中部，需要依赖此值
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indicatorHeight: 50,
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// 字母放大指示器的top值，为了让其指向当前激活的字母
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// indicatorTop: 0
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// 当前是否正在被触摸状态
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touching: false,
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// 滚动条顶部top值
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scrollTop: 0,
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// scroll-view的高度
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scrollViewHeight: 0,
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// 系统信息
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sys: sys(),
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scrolling: false,
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scrollIntoView: '',
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}
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},
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computed: {
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// 如果有传入外部的indexList锚点数组则使用，否则使用内部生成A-Z字母
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uIndexList() {
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return this.indexList.length ? this.indexList : indexList()
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},
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// 字母放大指示器的top值，为了让其指向当前激活的字母
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indicatorTop() {
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const {
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top,
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itemHeight
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} = this.letterInfo
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return Math.floor(top + itemHeight * this.activeIndex + itemHeight / 2 - this.indicatorHeight / 2)
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}
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},
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watch: {
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// 监听字母索引的变化，重新设置尺寸
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uIndexList: {
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immediate: true,
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handler() {
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sleep().then(() => {
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this.setIndexListLetterInfo()
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})
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}
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}
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},
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created() {
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this.children = []
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this.anchors = []
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this.init()
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},
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mounted() {
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this.setIndexListLetterInfo()
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},
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methods: {
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addUnit,
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init() {
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// 设置列表的高度为整个屏幕的高度
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//减去this.customNavHeight，并将this.scrollViewHeight设置为maxHeight
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//解决当u-index-list组件放在tabbar页面时,scroll-view内容较少时，还能滚动
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let customNavHeight = getPx(this.customNavHeight)
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this.scrollViewHeight = this.sys.windowHeight - customNavHeight
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},
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// 索引列表被触摸
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touchStart(e) {
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// 获取触摸点信息
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const touchStart = e.changedTouches[0]
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if (!touchStart) return
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this.touching = true
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const {
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pageY
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} = touchStart
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// 根据当前触摸点的坐标，获取当前触摸的为第几个字母
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const currentIndex = this.getIndexListLetter(pageY)
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this.setValueForTouch(currentIndex)
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},
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// 索引字母列表被触摸滑动中
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touchMove(e) {
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// 获取触摸点信息
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let touchMove = e.changedTouches[0]
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if (!touchMove) return;
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// 滑动结束后迅速开始第二次滑动时候 touching 为 false 造成不显示 indicator 问题
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if (!this.touching) {
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this.touching = true
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}
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const {
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pageY
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} = touchMove
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const currentIndex = this.getIndexListLetter(pageY)
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this.setValueForTouch(currentIndex)
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},
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// 触摸结束
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touchEnd(e) {
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// 延时一定时间后再隐藏指示器，为了让用户看的更直观，同时也是为了消除快速切换u-transition的show带来的影响
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sleep(300).then(() => {
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this.touching = false
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})
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},
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// 获取索引列表的尺寸以及单个字符的尺寸信息
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getIndexListLetterRect() {
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return new Promise(resolve => {
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// 延时一定时间，以获取dom尺寸
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// #ifndef APP-NVUE
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this.$uGetRect('.u-index-list__letter').then(size => {
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resolve(size)
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})
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// #endif
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// #ifdef APP-NVUE
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const ref = this.$refs['u-index-list__letter']
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dom.getComponentRect(ref, res => {
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resolve(res.size)
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})
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// #endif
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})
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},
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// 设置indexList索引的尺寸信息
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setIndexListLetterInfo() {
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this.getIndexListLetterRect().then(size => {
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const {
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height
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} = size
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const sysData = sys()
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const windowHeight = sysData.windowHeight
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let customNavHeight = 0
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// 消除各端导航栏非原生和原生导致的差异，让索引列表字母对屏幕垂直居中
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if (this.customNavHeight == 0) {
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// #ifdef H5
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customNavHeight = sysData.windowTop
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// #endif
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// #ifndef H5
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// 在非H5中，为原生导航栏，其高度不算在windowHeight内，这里设置为负值，后面相加时变成减去其高度的一半
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customNavHeight = -(sysData.statusBarHeight + 44)
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// #endif
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} else {
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customNavHeight = getPx(this.customNavHeight)
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}
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this.letterInfo = {
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height,
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// 为了让字母列表对屏幕绝对居中，让其对导航栏进行修正，也即往上偏移导航栏的一半高度
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top: (windowHeight - height) / 2 + customNavHeight / 2,
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itemHeight: Math.floor(height / this.uIndexList.length)
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}
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})
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},
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// 获取当前被触摸的索引字母
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getIndexListLetter(pageY) {
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const {
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top,
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height,
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itemHeight
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} = this.letterInfo
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// 对H5的pageY进行修正，这是由于uni-app自作多情在H5中将触摸点的坐标跟H5的导航栏结合导致的问题
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// #ifdef H5
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pageY += sys().windowTop
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// #endif
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// 对第一和最后一个字母做边界处理，因为用户可能在字母列表上触摸到两端的尽头后依然继续滑动
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if (pageY < top) {
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return 0
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} else if (pageY >= top + height) {
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// 如果超出了，取最后一个字母
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return this.uIndexList.length - 1
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} else {
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// 将触摸点的Y轴偏移值，减去索引字母的top值，除以每个字母的高度，即可得到当前触摸点落在哪个字母上
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return Math.floor((pageY - top) / itemHeight);
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}
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},
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// 设置各项由触摸而导致变化的值
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setValueForTouch(currentIndex) {
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// 如果偏移量太小，前后得出的会是同一个索引字母，为了防抖，进行返回
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if (currentIndex === this.activeIndex) return
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this.activeIndex = currentIndex
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// #ifndef APP-NVUE || MP-WEIXIN
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// 在非nvue中，由于anchor和item都在u-index-item中，所以需要对index-item进行偏移
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this.scrollIntoView = `u-index-item-${this.uIndexList[currentIndex].charCodeAt(0)}`
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// #endif
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// #ifdef MP-WEIXIN
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// 微信小程序下，scroll-view的scroll-into-view属性无法对slot中的内容的id生效，只能通过设置scrollTop的形式去移动滚动条
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const customNavHeight = this.customNavHeight
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this.scrollTop = this.children[currentIndex].top - getPx(customNavHeight)
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// #endif
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// #ifdef APP-NVUE
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// 在nvue中，由于cell和header为同级元素，所以实际是需要对header(anchor)进行偏移
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const anchor = `u-index-anchor-${this.uIndexList[currentIndex]}`
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dom.scrollToElement(this.anchors[currentIndex].$refs[anchor], {
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offset: 0,
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animated: false
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})
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// #endif
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},
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getHeaderRect() {
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// 获取header slot的高度，因为list组件中获取元素的尺寸是没有top值的
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return new Promise(resolve => {
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dom.getComponentRect(this.$refs.header, res => {
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resolve(res.size)
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})
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})
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},
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// scroll-view的滚动事件
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async scrollHandler(e) {
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if (this.touching || this.scrolling) return
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// 每过一定时间取样一次，减少资源损耗以及可能带来的卡顿
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this.scrolling = true
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sleep(10).then(() => {
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this.scrolling = false
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})
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let scrollTop = 0
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const len = this.children.length
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let children = this.children
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const anchors = this.anchors
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// #ifdef APP-NVUE
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// nvue下获取的滚动条偏移为负数，需要转为正数
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scrollTop = Math.abs(e.contentOffset.y)
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// 获取header slot的尺寸信息
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const header = await this.getHeaderRect()
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// item的top值，在nvue下，模拟出的anchor的top，类似非nvue下的index-item的top
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let top = header.height
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// 由于list组件无法获取cell的top值，这里通过header slot和各个item之间的height，模拟出类似非nvue下的位置信息
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children = this.children.map((item, index) => {
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const child = {
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height: item.height,
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top
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}
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// 进行累加，给下一个item提供计算依据
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top += item.height + anchors[index].height
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return child
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})
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// #endif
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// #ifndef APP-NVUE
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// 非nvue通过detail获取滚动条位移
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scrollTop = e.detail.scrollTop
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// #endif
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scrollTop += getPx(this.customNavHeight)
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for (let i = 0; i < len; i++) {
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const item = children[i],
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nextItem = children[i + 1]
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// 如果滚动条高度小于第一个item的top值，此时无需设置任意字母为高亮
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if (scrollTop <= children[0].top || scrollTop >= children[len - 1].top + children[len -
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1].height) {
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this.activeIndex = -1
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break
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} else if (!nextItem) {
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// 当不存在下一个item时，意味着历遍到了最后一个
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this.activeIndex = len - 1
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break
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} else if (scrollTop > item.top && scrollTop < nextItem.top) {
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this.activeIndex = i
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break
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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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@import "../../libs/css/components.scss";
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.u-index-list {
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&__letter {
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position: fixed;
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right: 0;
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text-align: center;
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z-index: 3;
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padding: 0 6px;
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&__item {
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width: 16px;
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height: 16px;
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border-radius: 100px;
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margin: 1px 0;
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@include flex;
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align-items: center;
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justify-content: center;
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&--active {
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background-color: $u-primary;
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}
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&__index {
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font-size: 12px;
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text-align: center;
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line-height: 12px;
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}
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}
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}
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&__indicator {
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width: 50px;
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height: 50px;
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border-radius: 100px 100px 0 100px;
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text-align: center;
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color: #ffffff;
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background-color: #c9c9c9;
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transform: rotate(-45deg);
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@include flex;
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justify-content: center;
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align-items: center;
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&__text {
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font-size: 28px;
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line-height: 28px;
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font-weight: bold;
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color: #fff;
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transform: rotate(45deg);
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text-align: center;
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}
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}
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}
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</style>
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