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265
pageC/classify/index.vue
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265
pageC/classify/index.vue
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<template>
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<view class="u-wrap">
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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" :class="[current == index ? 'u-tab-item-active' : '']"
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@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" @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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<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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<script>
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import classifyData from '@/static/js/classify.data.js';
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export default {
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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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tabbar: classifyData,
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menuItemPos: [],
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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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onLoad() {
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},
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onReady() {
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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.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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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('menu-scroll-view', 'menuHeight');
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await this.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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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();
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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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this.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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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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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('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 + this.menuHeight / 2;
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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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// 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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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-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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width: 180rpx;
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height: 88rpx;
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border-bottom: 1rpx solid rgba(236,236,236,1);
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// height: 110rpx;
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background: rgba(247,247,247,1);
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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: 28rpx;
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color: #666666;
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}
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.u-tab-item-active {
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position: relative;
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color: #FF780F;
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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-type-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: #333333;
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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: #666666;
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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: 150rpx;
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height: 150rpx;
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}
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</style>
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