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440 lines
13 KiB
440 lines
13 KiB
<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: $u.addUnit(scrollViewHeight) |
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}" |
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@scroll="scrollHandler" |
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ref="uList" |
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> |
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<cell |
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v-if="$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: $u.addUnit(scrollViewHeight) |
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}" |
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scroll-y |
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@scroll="scrollHandler" |
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ref="uList" |
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> |
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<view v-if="$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: $u.addUnit(letterInfo.top || 100) }" |
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@touchstart="touchStart" |
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@touchmove.stop.prevent="touchMove" |
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@touchend.stop.prevent="touchEnd" |
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@touchcancel.stop.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: $u.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: $u.addUnit(indicatorHeight), |
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width: $u.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.js'; |
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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://uviewui.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: [uni.$u.mpMixin, uni.$u.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: uni.$u.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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uni.$u.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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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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this.scrollViewHeight = this.sys.windowHeight - this.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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|
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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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uni.$u.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 sys = uni.$u.sys() |
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const windowHeight = sys.windowHeight |
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let customNavHeight = 0 |
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// 消除各端导航栏非原生和原生导致的差异,让索引列表字母对屏幕垂直居中 |
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if (this.customNavHeight == 0) { |
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// #ifdef H5 |
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customNavHeight = sys.windowTop |
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// #endif |
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// #ifndef H5 |
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// 在非H5中,为原生导航栏,其高度不算在windowHeight内,这里设置为负值,后面相加时变成减去其高度的一半 |
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customNavHeight = -(sys.statusBarHeight + 44) |
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// #endif |
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} else { |
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customNavHeight = uni.$u.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 += uni.$u.sys().windowTop |
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// #endif |
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// 对第一和最后一个字母做边界处理,因为用户可能在字母列表上触摸到两端的尽头后依然继续滑动 |
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if (pageY < top) { |
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return 0 |
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} else if (pageY >= top + height) { |
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// 如果超出了,取最后一个字母 |
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return this.uIndexList.length - 1 |
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} else { |
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// 将触摸点的Y轴偏移值,减去索引字母的top值,除以每个字母的高度,即可得到当前触摸点落在哪个字母上 |
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return Math.floor((pageY - top) / itemHeight); |
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} |
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}, |
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// 设置各项由触摸而导致变化的值 |
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setValueForTouch(currentIndex) { |
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// 如果偏移量太小,前后得出的会是同一个索引字母,为了防抖,进行返回 |
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if (currentIndex === this.activeIndex) return |
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this.activeIndex = currentIndex |
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// #ifndef APP-NVUE || MP-WEIXIN |
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// 在非nvue中,由于anchor和item都在u-index-item中,所以需要对index-item进行偏移 |
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this.scrollIntoView = `u-index-item-${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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this.scrollTop = this.children[currentIndex].top |
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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.$refs.header, res => { |
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resolve(res.size) |
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}) |
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}) |
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}, |
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// scroll-view的滚动事件 |
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async scrollHandler(e) { |
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if (this.touching || this.scrolling) return |
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// 每过一定时间取样一次,减少资源损耗以及可能带来的卡顿 |
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this.scrolling = true |
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uni.$u.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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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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|
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.u-index-list { |
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|
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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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|
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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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