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<template>
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<!-- 支付宝小程序使用$u.getRect()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="u-index-bar">
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<slot />
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<view v-if="showSidebar" class="u-index-bar__sidebar" @touchstart.stop.prevent="onTouchMove" @touchmove.stop.prevent="onTouchMove"
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@touchend.stop.prevent="onTouchStop" @touchcancel.stop.prevent="onTouchStop">
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<view v-for="(item, index) in indexList" :key="index" class="u-index-bar__index" :style="{zIndex: zIndex + 1, color: activeAnchorIndex === index ? activeColor : ''}"
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:data-index="index">
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{{ item }}
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</view>
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</view>
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<view class="u-indexed-list-alert" v-if="touchmove && indexList[touchmoveIndex]" :style="{
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zIndex: alertZIndex
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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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var indexList = function() {
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var indexList = [];
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var 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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/**
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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,搭配<u-index-anchor>使用
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* @tutorial https://www.uviewui.com/components/indexList.html#indexanchor-props
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* @property {Number String} scroll-top 当前滚动高度，自定义组件无法获得滚动条事件，所以依赖接入方传入
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* @property {Array} index-list 索引字符列表，数组（默认A-Z）
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* @property {Number String} z-index 锚点吸顶时的层级（默认965）
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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 {Number String} offset-top 锚点自动吸顶时与顶部的距离（默认0）
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* @property {String} highlight-color 锚点和右边索引字符高亮颜色（默认#2979ff）
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* @event {Function} select 选中右边索引字符时触发
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* @example <u-index-list :scrollTop="scrollTop"></u-index-list>
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*/
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export default {
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name: "u-index-list",
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props: {
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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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zIndex: {
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type: [Number, String],
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default: ''
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},
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scrollTop: {
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type: [Number, String],
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default: 0,
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},
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offsetTop: {
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type: [Number, String],
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default: 0
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},
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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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activeColor: {
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type: String,
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default: '#2979ff'
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}
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},
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created() {
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// #ifdef H5
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this.stickyOffsetTop = this.offsetTop ? uni.upx2px(this.offsetTop) : 44;
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// #endif
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// #ifndef H5
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this.stickyOffsetTop = this.offsetTop ? uni.upx2px(this.offsetTop) : 0;
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// #endif
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// 只能在created生命周期定义children，如果在data定义，会因为循环引用而报错
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this.children = [];
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},
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data() {
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return {
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activeAnchorIndex: 0,
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showSidebar: true,
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// children: [],
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touchmove: false,
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touchmoveIndex: 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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computed: {
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// 弹出toast的z-index值
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alertZIndex() {
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return this.$u.zIndex.toast;
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}
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},
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methods: {
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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.children.length;
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this.setRect().then(() => {
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this.onScroll();
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});
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}, 0);
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},
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setRect() {
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return Promise.all([
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this.setAnchorsRect(),
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this.setListRect(),
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this.setSiderbarRect()
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]);
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},
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setAnchorsRect() {
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return Promise.all(this.children.map((anchor, index) => anchor
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.$uGetRect('.u-index-anchor-wrapper')
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.then((rect) => {
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Object.assign(anchor, {
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height: rect.height,
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top: rect.top
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});
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})));
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},
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setListRect() {
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return this.$uGetRect('.u-index-bar').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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setSiderbarRect() {
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return this.$uGetRect('.u-index-bar__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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getActiveAnchorIndex() {
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const {
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children
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} = this;
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const {
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sticky
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} = this;
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for (let i = this.children.length - 1; i >= 0; i--) {
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const preAnchorHeight = i > 0 ? children[i - 1].height : 0;
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const reachTop = sticky ? preAnchorHeight : 0;
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if (reachTop >= children[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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onScroll() {
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const {
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children = []
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} = this;
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if (!children.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 =
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children[active].top <= 0;
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}
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children.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: `${children[index].height}px`
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};
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anchorStyle = {
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position: 'fixed',
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top: `${stickyOffsetTop}px`,
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zIndex: `${zIndex ? zIndex : this.$u.zIndex.indexListSticky}`,
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color: `${activeColor}`
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};
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}
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item.active = active;
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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 = children[index];
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const currentOffsetTop = currentAnchor.top;
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const targetOffsetTop = index === children.length - 1 ?
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this.top :
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children[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.$u.zIndex.indexListSticky}`,
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color: `${activeColor}`
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};
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item.active = active;
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item.anchorStyle = anchorStyle;
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} else {
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item.active = false;
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item.anchorStyle = '';
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item.wrapperStyle = '';
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}
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});
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}
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},
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onTouchMove(event) {
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this.touchmove = true;
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const sidebarLength = this.children.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 = 0;
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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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onTouchStop() {
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this.touchmove = false;
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this.scrollToAnchorIndex = null;
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},
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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.children.find((item) => item.index === this.indexList[index]);
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if (anchor) {
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this.$emit('select', anchor.index);
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uni.pageScrollTo({
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duration: 0,
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scrollTop: anchor.top + this.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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@import "../../libs/css/style.components.scss";
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.u-index-bar {
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position: relative
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}
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.u-index-bar__sidebar {
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position: fixed;
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top: 50%;
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right: 0;
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@include vue-flex;
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flex-direction: column;
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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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}
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.u-index-bar__index {
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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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.u-indexed-list-alert {
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position: fixed;
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width: 120rpx;
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height: 120rpx;
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right: 90rpx;
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top: 50%;
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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: #fff;
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background-color: rgba(0, 0, 0, 0.65);
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@include vue-flex;
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justify-content: center;
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align-items: center;
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padding: 0;
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z-index: 9999999;
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}
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.u-indexed-list-alert text {
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line-height: 50rpx;
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}
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</style>
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