重新实现分类组件逻辑
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@ -1,20 +1,13 @@
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<template>
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<view class="component-cate" :style="{ height: wrapHeight + 'px' }">
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<view class="menu-wrap">
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<scroll-view
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scroll-y
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class="tab-view menu-scroll-view"
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:scroll-top="scrollTop"
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:scroll-into-view="itemId"
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:enhanced="true"
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:bounces="false"
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>
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<scroll-view scroll-y class="tab-view menu-scroll-view" :scroll-top="scrollLeftTop" :enhanced="true" :bounces="false">
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<view
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class="tab-item"
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v-for="(item, index) in data"
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:key="index"
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:class="[current == index ? 'tab-item-active' : '']"
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@tap.stop="swichMenu(index)"
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:class="[currentLeftIndex == index ? 'tab-item-active' : '']"
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@tap.stop="switchMenu(index)"
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>
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<text class="line-1">{{ item.name }}</text>
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</view>
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@ -32,9 +25,8 @@
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<view
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class="class-item"
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v-for="(item, index) in data"
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:id="'item' + index"
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:key="index"
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:style="{ height: index == data.length - 1 ? wrapHeight + utils.rpx2px(110) + 'px' : 'auto' }"
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:style="{ height: index == data.length - 1 ? wrapHeight + 'px' : 'auto' }"
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>
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<cate-tmpl v-if="cateType === 'cate'" :parentId="item.id" :data="item" @clickItem="clickItem"></cate-tmpl>
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<list-tmpl v-if="cateType === 'list'" :parentId="item.id" :data="item" @clickItem="clickItem"></list-tmpl>
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@ -53,18 +45,16 @@ export default {
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data() {
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return {
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utils: this.$utils,
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scrollTop: 0, //tab标题的滚动条位置
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oldScrollTop: 0, // tab标题的滚动条旧位置
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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: 50, // 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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arr: [], // 储存距离顶部高度的数组
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scrollRightTop: 0, // 右边栏目scroll-view的滚动条高度
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isReady: false,
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leftNodePos: [],
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rightNodePos: [],
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queryTimer: null,
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currentLeftIndex: 0,
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wrapHeight: 0,
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// 按ID选择
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timer: null,
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activeIndex: 0,
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scrollLeftTop: 0,
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scrollRightTop: 0,
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menuHeight: 0,
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};
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},
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props: {
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@ -91,7 +81,6 @@ export default {
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},
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created() {},
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mounted() {
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this.getMenuItemTop();
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const { windowHeight, statusBarHeight, headerHeight } = getApp().globalData.pageConfig;
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// 计算页面内边距------------------------------------------
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// #ifndef H5
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@ -108,163 +97,107 @@ export default {
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// H5窗口高度会计算tabbar高度，这里减去
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this.wrapHeight -= this.$utils.rpx2px(100);
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// #endif
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this.menuHeight = this.$utils.rpx2px(100);
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},
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destroyed() {},
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watch: {
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/**
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* 监听列表数据变化
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*/
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data() {
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this.init().then(() => {
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this.isReady = true;
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this.reAction();
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});
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},
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/**
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* 监听ID变化
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*/
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activeId() {
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if (this.isReady) {
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this.reAction();
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}
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},
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},
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methods: {
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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
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.select("." + elClass)
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.fields(
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{
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size: true,
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},
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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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// this.getElRect(elClass);
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return;
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/**
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* 执行具体逻辑
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*/
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reAction() {
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this.switchCate(this.activeId);
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},
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/**
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* 初始化列表
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*/
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init() {
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clearTimeout(this.queryTimer);
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return new Promise((resolve, reject) => {
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const that = this;
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this.queryTimer = setTimeout(() => {
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that.rightNodePos = [];
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let query = uni.createSelectorQuery().in(that);
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query
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.selectAll(".class-item")
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.boundingClientRect((result) => {
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if (result.length > 0) {
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result.forEach((item) => {
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that.rightNodePos.push(item.top - result[0].top);
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});
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resolve();
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}
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this[dataVal] = res.height;
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resolve();
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}
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)
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.exec();
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})
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.exec();
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}, 200);
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});
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},
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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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* 储存到 arr 数组里面用于后面滚动判断
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* 更新左侧菜单
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*/
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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
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.selectAll(".class-item")
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.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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// this.getMenuItemTop();
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return;
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}
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rects.forEach((rect) => {
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// 视情况而定，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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// this.arr.push(rect.top)
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resolve();
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});
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})
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.exec();
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});
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updateMenuStatus(index) {
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this.currentLeftIndex = index;
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this.scrollLeftTop = index * this.menuHeight - this.wrapHeight / 2;
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},
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/**
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* 观测元素相交状态
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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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* 滚动监听
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*/
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async observer() {
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this.data.map((val, index) => {
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let observer = uni.createIntersectionObserver(this);
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observer
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.relativeTo(".right-box", {
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top: 0,
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})
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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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/**
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* 设置左边菜单的滚动状态
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* @index 传入的 ID
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*/
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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("component-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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/**
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* 点击左边的栏目切换
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* @index 传入的 ID
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*/
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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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/**
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* 右边菜单滚动
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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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*/
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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.menuHeight) {
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await this.getElRect("menu-scroll-view", "menuHeight");
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}
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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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// scrollHeight为右边菜单头部位置
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let scrollHeight = e.detail.scrollTop + 15;
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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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if (!height2 || (scrollHeight >= height1 && scrollHeight < height2)) {
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this.leftMenuStatus(i);
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rightScroll(e) {
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let scrollTop = e.detail.scrollTop + 15;
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for (let index = 0; index < this.rightNodePos.length; index++) {
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let current = this.rightNodePos[index];
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let next = this.rightNodePos[index + 1];
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if (!next || (scrollTop >= current && scrollTop < next)) {
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this.updateMenuStatus(index);
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return;
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}
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}
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},
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/**
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* 选中某项
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*/
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switchMenu(index) {
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this.currentLeftIndex = index;
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this.scrollRightTop = this.rightNodePos[index];
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},
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/**
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* 按ID选中
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*/
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async switchCate(id) {
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if (this.arr.length == 0) {
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await this.getMenuItemTop();
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}
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switchCate(id) {
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let activeIndex = 0;
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this.data.forEach((item, index) => {
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if (item.id == id) {
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this.activeIndex = index;
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activeIndex = index;
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}
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});
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this.swichMenu(this.activeIndex);
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this.switchMenu(activeIndex);
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},
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/**
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* 点击
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*/
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clickItem(parentId, id) {
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this.$emit("clickItem", parentId, id);
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},
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},
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watch: {
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activeId(activeId) {
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this.switchCate(activeId);
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},
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arr(arr) {
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clearTimeout(this.timer);
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if (this.activeIndex > 0) {
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const that = this;
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this.timer = setTimeout(() => {
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that.scrollRightTop = arr[that.activeIndex];
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}, 200);
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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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