<script setup>
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import { ref, onMounted, nextTick } from 'vue';
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import classifyData from '@/pages_template/common/classify.data.js';
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const scrollTop = ref(0); // tab标题的滚动条位置
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const oldScrollTop = ref(0);
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const current = ref(0); // 预设当前项的值
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const menuHeight = ref(0); // 左边菜单的高度
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const menuItemHeight = ref(0); // 左边菜单item的高度
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const itemId = ref(''); // 栏目右边scroll-view用于滚动的id
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const tabbar = classifyData;
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const arr = ref([]);
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const scrollRightTop = ref(0); // 右边栏目scroll-view的滚动条高度
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const timer = ref(null); // 定时器
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onMounted(() => {
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getMenuItemTop();
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});
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// 点击左边的栏目切换
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const swichMenu = async (index) => {
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if (arr.value.length === 0) {
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await getMenuItemTop();
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}
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if (index === current.value) return;
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scrollRightTop.value = oldScrollTop.value;
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await nextTick(() => {
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scrollRightTop.value = arr.value[index];
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current.value = index;
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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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const getElRect = (elClass, dataVal) => {
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return 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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getElRect(elClass, dataVal);
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}, 10);
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return;
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}
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dataVal.value = 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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const observer = () => {
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tabbar.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right-box的相交状态
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// 如果跟.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('.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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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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const leftMenuStatus = async (index) => {
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current.value = index;
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// 如果为0，意味着尚未初始化
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if (menuHeight.value === 0 || menuItemHeight.value === 0) {
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await getElRect('menu-scroll-view', menuHeight);
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await getElRect('u-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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scrollTop.value = index * menuItemHeight.value + menuItemHeight.value / 2 - menuHeight.value / 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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const getMenuItemTop = () => {
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return new Promise((resolve) => {
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let selectorQuery = uni.createSelectorQuery();
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selectorQuery.selectAll('.class-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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getMenuItemTop();
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}, 10);
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return;
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}
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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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arr.value.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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const rightScroll = async (e) => {
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oldScrollTop.value = e.detail.scrollTop;
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if (arr.value.length === 0) {
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await getMenuItemTop();
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}
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if (timer.value) return;
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if (!menuHeight.value) {
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await getElRect('menu-scroll-view', menuHeight);
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}
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setTimeout(() => { // 节流
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timer.value = 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 + menuHeight.value / 2;
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for (let i = 0; i < arr.value.length; i++) {
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let height1 = arr.value[i];
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let height2 = arr.value[i + 1];
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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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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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const clickMenu = (menu) => {
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console.log(menu);
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};
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</script>
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<template>
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<view class="u-wrap">
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<view class="u-search-box">
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<view class="u-search-inner">
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<u-icon name="search" color="#909399" :size="28"></u-icon>
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<text class="u-search-text">搜索</text>
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</view>
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</view>
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<view class="u-menu-wrap">
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<scroll-view scroll-y scroll-with-animation class="u-tab-view menu-scroll-view" :scroll-top="scrollTop"
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:scroll-into-view="itemId">
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<view v-for="(item, index) in tabbar" :key="index" class="u-tab-item"
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:class="[current == index ? 'u-tab-item-active' : '']" @tap.stop="swichMenu(index)">
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<text class="u-line-1">{{ item.name }}</text>
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</view>
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</scroll-view>
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<scroll-view :scroll-top="scrollRightTop" scroll-y scroll-with-animation class="right-box"
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@scroll="rightScroll">
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<view class="page-view">
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<view class="class-item" :id="'item' + index" v-for="(item, index) in tabbar" :key="index">
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<view class="item-title">
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<text>{{ item.name }}</text>
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</view>
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<view class="item-container">
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<view class="thumb-box" v-for="(item1, index1) in item.foods" :key="index1"
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@click="clickMenu(item1)">
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<image class="item-menu-image" :src="item1.icon" mode=""></image>
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<view class="item-menu-name">{{ item1.name }}</view>
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</view>
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</view>
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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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<style lang="scss" scoped>
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.u-wrap {
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height: calc(100vh);
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/* #ifdef H5 */
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height: calc(100vh - var(--window-top));
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/* #endif */
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display: flex;
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flex-direction: column;
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}
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.u-search-box {
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padding: 18rpx 30rpx;
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}
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.u-menu-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-tab-view {
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width: 200rpx;
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height: 100%;
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}
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.u-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-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-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-tab-view {
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height: 100%;
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}
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.right-box {
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background-color: rgb(250, 250, 250);
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}
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.page-view {
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padding: 16rpx;
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}
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.class-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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.class-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: $u-main-color;
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}
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.item-container {
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display: flex;
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flex-wrap: wrap;
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}
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// 定义项目尺寸变量
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$item-size: 100rpx;
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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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padding: 10rpx;
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box-sizing: border-box;
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// 使图片容器的宽高都基于item-size变量
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.item-menu-image {
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width: $item-size;
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height: $item-size;
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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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margin-top: 10rpx;
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text-align: center;
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}
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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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