<template>
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<view class="u-cate-tab">
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<view class="u-cate-tab__wrap">
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<scroll-view class="u-cate-tab__view u-cate-tab__menu-scroll-view"
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scroll-y scroll-with-animation :scroll-top="scrollTop"
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:scroll-into-view="itemId">
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<view v-for="(item, index) in tabList" :key="index" class="u-cate-tab__item"
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:class="[current == index ? 'u-cate-tab__item-active' : '']"
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@tap.stop="swichMenu(index)">
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<slot name="tabItem" :item="item">
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</slot>
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<text v-if="!$slots['tabItem']" class="u-line-1">{{item[tabKeyName]}}</text>
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</view>
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</scroll-view>
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<scroll-view :scroll-top="scrollRightTop" scroll-with-animation
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scroll-y class="u-cate-tab__right-box" @scroll="rightScroll">
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<view class="u-cate-tab__page-view">
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<view class="u-cate-tab__page-item" :id="'item' + index"
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v-for="(item , index) in tabList" :key="index">
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<slot name="itemList" :item="item">
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</slot>
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<template v-if="!$slots['itemList']">
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<view class="item-title">
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<text>{{item[tabKeyName]}}</text>
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</view>
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<view class="item-container">
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<template v-for="(item1, index1) in item.children" :key="index1">
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<slot name="pageItem" :pageItem="item1">
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<view class="thumb-box" >
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<image class="item-menu-image" :src="item1.icon" mode=""></image>
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<view class="item-menu-name">{{item1[itemKeyName]}}</view>
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</view>
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</slot>
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</template>
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</view>
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</template>
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</view>
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</view>
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</scroll-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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export default {
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name: 'up-cate-tab',
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props: {
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tabList: {
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type: Array,
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default: () => {
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return []
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}
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},
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tabKeyName: {
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type: String,
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default: 'name'
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},
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itemKeyName: {
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type: String,
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default: 'name'
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}
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},
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watch: {
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tabList() {
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this.getMenuItemTop()
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}
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},
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data() {
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return {
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scrollTop: 0, //tab标题的滚动条位置
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oldScrollTop: 0,
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current: 0, // 预设当前项的值
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menuHeight: 0, // 左边菜单的高度
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menuItemHeight: 0, // 左边菜单item的高度
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itemId: '', // 栏目右边scroll-view用于滚动的id
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menuItemPos: [],
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rects: [],
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arr: [],
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scrollRightTop: 0, // 右边栏目scroll-view的滚动条高度
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timer: null, // 定时器
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}
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},
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onMounted() {
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this.getMenuItemTop()
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},
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methods: {
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// 点击左边的栏目切换
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async swichMenu(index) {
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if(this.arr.length == 0) {
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await this.getMenuItemTop();
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}
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if (index == this.current) return;
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this.scrollRightTop = this.oldScrollTop;
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this.$nextTick(function(){
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this.scrollRightTop = this.arr[index];
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this.current = index;
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this.leftMenuStatus(index);
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})
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},
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// 获取一个目标元素的高度
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getElRect(elClass, dataVal) {
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new Promise((resolve, reject) => {
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const query = uni.createSelectorQuery().in(this);
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query.select('.' + elClass).fields({
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size: true
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}, res => {
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// 如果节点尚未生成，res值为null，循环调用执行
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if (!res) {
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setTimeout(() => {
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this.getElRect(elClass);
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}, 10);
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return;
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}
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this[dataVal] = res.height;
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resolve();
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}).exec();
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})
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},
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// 观测元素相交状态
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async observer() {
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this.tabList.map((val, index) => {
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let observer = uni.createIntersectionObserver(this);
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// 检测右边scroll-view的id为itemxx的元素与u-cate-tab__right-box的相交状态
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// 如果跟.u-cate-tab__right-box底部相交，就动态设置左边栏目的活动状态
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observer.relativeTo('.u-cate-tab__right-box', {
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top: 0
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}).observe('#item' + index, res => {
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if (res.intersectionRatio > 0) {
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let id = res.id.substring(4);
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this.leftMenuStatus(id);
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}
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})
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})
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},
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// 设置左边菜单的滚动状态
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async leftMenuStatus(index) {
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this.current = index;
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// 如果为0，意味着尚未初始化
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if (this.menuHeight == 0 || this.menuItemHeight == 0) {
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await this.getElRect('u-cate-tab__menu-scroll-view', 'menuHeight');
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await this.getElRect('u-cate-tab__item', 'menuItemHeight');
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}
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// 将菜单活动item垂直居中
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this.scrollTop = index * this.menuItemHeight + this.menuItemHeight / 2 - this.menuHeight / 2;
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},
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// 获取右边菜单每个item到顶部的距离
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getMenuItemTop() {
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new Promise(resolve => {
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let selectorQuery = uni.createSelectorQuery().in(this);
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selectorQuery.selectAll('.u-cate-tab__page-item').boundingClientRect((rects) => {
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// 如果节点尚未生成，rects值为[](因为用selectAll，所以返回的是数组)，循环调用执行
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if(!rects.length) {
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setTimeout(() => {
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this.getMenuItemTop();
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}, 10);
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return ;
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}
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this.rects = rects;
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rects.forEach((rect) => {
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// 这里减去rects[0].top，是因为第一项顶部可能不是贴到导航栏(比如有个搜索框的情况)
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this.arr.push(rect.top - rects[0].top);
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resolve();
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})
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}).exec()
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})
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},
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// 右边菜单滚动
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async rightScroll(e) {
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this.oldScrollTop = e.detail.scrollTop;
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// console.log(e.detail.scrollTop)
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// console.log(JSON.stringify(this.arr))
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if(this.arr.length == 0) {
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await this.getMenuItemTop();
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}
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if(this.timer) return ;
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if(!this.menuHeight) {
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await this.getElRect('u-cate-tab__menu-scroll-view', 'menuHeight');
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}
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setTimeout(() => { // 节流
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this.timer = null;
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// scrollHeight为右边菜单垂直中点位置
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let scrollHeight = e.detail.scrollTop + 1;
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// console.log(e.detail.scrollTop)
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for (let i = 0; i < this.arr.length; i++) {
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let height1 = this.arr[i];
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let height2 = this.arr[i + 1];
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// console.log('i', i)
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// console.log('height1', height1)
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// console.log('height2', height2)
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// 如果不存在height2，意味着数据循环已经到了最后一个，设置左边菜单为最后一项即可
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if (!height2 || scrollHeight >= height1 && scrollHeight <= height2) {
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// console.log('scrollHeight', scrollHeight)
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// console.log('height1', height1)
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// console.log('height2', height2)
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this.leftMenuStatus(i);
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return ;
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}
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}
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}, 10)
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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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.u-cate-tab {
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display: flex;
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flex-direction: column;
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}
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.u-cate-tab__wrap {
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flex: 1;
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display: flex;
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overflow: hidden;
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}
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.u-search-inner {
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background-color: rgb(234, 234, 234);
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border-radius: 100rpx;
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display: flex;
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align-items: center;
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padding: 10rpx 16rpx;
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}
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.u-search-text {
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font-size: 26rpx;
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color: $u-tips-color;
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margin-left: 10rpx;
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}
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.u-cate-tab__view {
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width: 200rpx;
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height: 100%;
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}
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.u-cate-tab__item {
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height: 110rpx;
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background: #f6f6f6;
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box-sizing: border-box;
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display: flex;
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align-items: center;
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justify-content: center;
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font-size: 26rpx;
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color: #444;
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font-weight: 400;
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line-height: 1;
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}
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.u-cate-tab__item-active {
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position: relative;
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color: #000;
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font-size: 30rpx;
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font-weight: 600;
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background: #fff;
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}
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.u-cate-tab__item-active::before {
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content: "";
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position: absolute;
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border-left: 4px solid $u-primary;
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height: 32rpx;
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left: 0;
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top: 39rpx;
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}
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.u-cate-tab__view {
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height: 100%;
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}
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.u-cate-tab__right-box {
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flex: 1;
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background-color: rgb(250, 250, 250);
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}
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.u-cate-tab__page-view {
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padding: 16rpx;
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}
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.u-cate-tab__page-item {
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margin-bottom: 30rpx;
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background-color: #fff;
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padding: 16rpx;
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border-radius: 8rpx;
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}
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.u-cate-tab__page-item:last-child {
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min-height: 100vh;
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}
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.item-title {
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font-size: 26rpx;
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color: $u-main-color;
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font-weight: bold;
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}
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.item-menu-name {
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font-weight: normal;
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font-size: 24rpx;
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color: $u-main-color;
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}
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.item-container {
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display: flex;
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flex-wrap: wrap;
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}
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.thumb-box {
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width: 33.333333%;
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display: flex;
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align-items: center;
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justify-content: center;
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flex-direction: column;
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margin-top: 20rpx;
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}
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.item-menu-image {
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width: 120rpx;
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height: 120rpx;
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}
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</style>
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