347 lines
10 KiB
Vue
347 lines
10 KiB
Vue
<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
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v-if="showSidebar"
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class="u-index-bar__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="u-index-bar__index"
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:style="{ zIndex: Number(zIndex) + 1, color: activeAnchorIndex === index ? activeColor : '' }"
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:data-index="index"
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>
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{{ item }}
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</view>
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</view>
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<view
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class="u-indexed-list-alert"
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v-if="touchmove && indexList[touchmoveIndex]"
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:style="{
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zIndex: alertZIndex
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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 lang="ts">
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export default {
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name: 'u-index-list',
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options: {
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addGlobalClass: true,
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// #ifndef MP-TOUTIAO
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virtualHost: true,
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// #endif
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styleIsolation: 'shared'
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}
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};
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</script>
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<script setup lang="ts">
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import { ref, reactive, computed, watch, onMounted, getCurrentInstance } from 'vue';
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import { $u, useParent } from '../..';
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import { IndexListProps } from './types';
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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://uviewpro.cn/zh/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（默认主题色primary）
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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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const props = defineProps(IndexListProps);
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const emit = defineEmits(['select']);
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const instance = getCurrentInstance();
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// 索引列表生成函数
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function getIndexList() {
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const indexList: string[] = [];
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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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// 变量定义
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const activeAnchorIndex = ref(0);
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const showSidebar = ref(true);
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const touchmove = ref(false);
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const touchmoveIndex = ref(0);
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const sidebar = reactive<{ height: number; top: number }>({ height: 0, top: 0 });
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const scrollToAnchorIndex = ref<number | null>(null);
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const timer = ref<any>(null);
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const top = ref(0);
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const height = ref(0);
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const stickyOffsetTop = ref(0);
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// 计算属性
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// 弹出toast的z-index值
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const alertZIndex = computed(() => $u.zIndex.toast).value;
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// indexList 响应式
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const indexList = computed(() => props?.indexList ?? getIndexList());
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const zIndex = computed(() => props.zIndex).value;
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const activeColor = computed(() => props.activeColor).value;
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const { children, broadcast } = useParent('u-index-anchor');
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// 兼容 H5/非H5 stickyOffsetTop
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onMounted(() => {
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const offsetTopNum = typeof props.offsetTop === 'string' ? Number(props.offsetTop) : props.offsetTop;
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// #ifdef H5
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stickyOffsetTop.value = offsetTopNum ? uni.upx2px(offsetTopNum) : 44;
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// #endif
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// #ifndef H5
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stickyOffsetTop.value = offsetTopNum ? uni.upx2px(offsetTopNum) : 0;
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// #endif
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});
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// 监听 scrollTop
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watch(
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() => props.scrollTop,
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() => {
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updateData();
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}
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);
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function updateData() {
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if (timer.value) clearTimeout(timer.value);
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timer.value = setTimeout(() => {
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showSidebar.value = !!children.length;
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setRect().then(() => {
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onScroll();
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});
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}, 0);
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}
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/**
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* 获取各区域尺寸
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*/
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function setRect() {
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return Promise.all([setAnchorsRect(), setListRect(), setSiderbarRect()]);
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}
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/**
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* 获取锚点尺寸
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*/
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function setAnchorsRect() {
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return Promise.all(
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children.map((anchor, index) => {
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$u.getRect('.u-index-anchor-wrapper', anchor.getInstance()).then((rect: any) => {
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broadcast('setTop', rect.top, anchor.id);
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broadcast('setHeight', rect.height, anchor.id);
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});
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})
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);
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}
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/**
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* 获取列表尺寸
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*/
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function setListRect() {
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return $u.getRect('.u-index-bar', instance).then((rect: any) => {
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height.value = rect.height;
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top.value = rect.top + Number(props.scrollTop);
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});
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}
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/**
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* 获取侧边栏尺寸
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*/
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function setSiderbarRect() {
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return $u.getRect('.u-index-bar__sidebar', instance).then((rect: any) => {
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sidebar.height = rect.height;
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sidebar.top = rect.top;
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});
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}
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/**
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* 获取当前激活锚点索引
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*/
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function getActiveAnchorIndex() {
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const sticky = props.sticky;
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for (let i = children.length - 1; i >= 0; i--) {
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const preAnchorHeight = i > 0 ? children[i - 1].getExposed().height.value : 0;
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const reachTop = sticky ? preAnchorHeight : 0;
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if (reachTop >= children[i].getExposed().top.value) {
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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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/**
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* 滚动时处理锚点吸顶和样式
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*/
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function onScroll() {
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if (!children.length) return;
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const sticky = props.sticky;
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const scrollTopNum = Number(props.scrollTop);
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const active = getActiveAnchorIndex();
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activeAnchorIndex.value = 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 = children[active].getExposed().top.value <= 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: any = '';
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let anchorStyle: any = {
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color: `${activeColor}`
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};
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if (isActiveAnchorSticky) {
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wrapperStyle = { height: `${children[index].getExposed().height.value}px` };
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anchorStyle = {
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position: 'fixed',
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top: `${stickyOffsetTop.value}px`,
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zIndex: `${zIndex ? zIndex : $u.zIndex.indexListSticky}`,
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color: `${activeColor}`
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};
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}
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broadcast('setActive', active, item.id);
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broadcast('setAnchorStyle', anchorStyle, item.id);
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broadcast('setWrapperStyle', wrapperStyle, item.id);
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} else if (index === active - 1) {
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const currentAnchor = children[index];
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const currentOffsetTop = currentAnchor.getExposed().top.value;
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const targetOffsetTop =
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index === children.length - 1 ? top.value : children[index + 1].getExposed().top.value;
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const parentOffsetHeight = targetOffsetTop - currentOffsetTop;
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const translateY = parentOffsetHeight - currentAnchor.getExposed().height.value;
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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 : $u.zIndex.indexListSticky}`,
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color: `${activeColor}`
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};
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broadcast('setActive', active, currentAnchor.id);
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broadcast('setAnchorStyle', anchorStyle, currentAnchor.id);
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broadcast('setWrapperStyle', '', item.id);
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} else {
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broadcast('setActive', false, item.id);
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broadcast('setAnchorStyle', '', item.id);
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broadcast('setWrapperStyle', '', item.id);
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}
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});
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}
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}
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/**
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* 侧边栏触摸移动
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*/
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function onTouchMove(event: TouchEvent) {
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touchmove.value = true;
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const sidebarLength = children.length;
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const touch = event.touches[0];
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const itemHeight = sidebar.height / sidebarLength;
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let clientY = touch.clientY;
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let index = Math.floor((clientY - 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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touchmoveIndex.value = index;
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scrollToAnchor(index);
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}
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/**
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* 侧边栏触摸结束
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*/
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function onTouchStop() {
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touchmove.value = false;
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scrollToAnchorIndex.value = null;
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}
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/**
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* 滚动到指定锚点
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*/
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function scrollToAnchor(index: number) {
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if (scrollToAnchorIndex.value === index) {
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return;
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}
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scrollToAnchorIndex.value = index;
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const anchor = children.find(item => item.getExposed().props.index === indexList.value[index]);
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if (anchor) {
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emit('select', anchor.getExposed().props.index);
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uni.pageScrollTo({
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duration: 0,
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scrollTop: anchor.getExposed().top.value + Number(props.scrollTop)
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});
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}
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}
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defineExpose({
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updateData,
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setRect,
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onScroll,
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children
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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: var(--u-white-color);
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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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