238 lines
5.2 KiB
Vue
238 lines
5.2 KiB
Vue
<template>
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<view>
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<view class="waterfall-box h-flex-x h-flex-2" v-if="showList">
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<view>
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<view v-for="(item,index) in leftList" :key="item._render_id"
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class="list-item"
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:class="{'show': showPage > item._current_page }"
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>
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<helang-waterfall-item
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:params="item"
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tag="left"
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:index="index"
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@height="onHeight"
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@click="onClick"
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></helang-waterfall-item>
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</view>
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</view>
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<view>
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<view v-for="(item,index) in rightList" :key="item._render_id"
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class="list-item"
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:class="{'show': showPage > item._current_page }"
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>
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<helang-waterfall-item
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:params="item"
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@height="onHeight"
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@click="onClick"
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tag="right"
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:index="index"
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></helang-waterfall-item>
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</view>
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</view>
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</view>
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<slot name="default"></slot>
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</view>
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</template>
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<script>
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import helangWaterfallItem from "./waterfall-item.vue"
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export default {
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name:"helangWaterfallList",
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options:{
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virtualHost: true
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},
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components: {
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"helang-waterfall-item": helangWaterfallItem
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},
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props:{
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// 组件状态
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status:{
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type: String,
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default:''
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},
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// 待渲染的数据
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list:{
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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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// 重置列表，设置为 true 时，瀑布流会自动重新渲染列表
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reset:{
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type: Boolean,
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default:false
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},
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},
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watch:{
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"$props.status"(newValue,oldValue){
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// 状态变更为 加载成功 时，执行瀑布流数据渲染
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if(newValue == 'success'){
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this.startRender();
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}else if(!this.showList){
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this.resetData();
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}
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}
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},
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computed:{
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showList(){
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return !["fail","empty"].includes(this.$props.status);
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}
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},
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data() {
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return {
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// 左侧列表高度
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leftHeight: 0,
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// 右侧列表高度
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rightHeight: 0,
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// 左侧列表数据
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leftList: [],
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// 右侧列表数据
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rightList: [],
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// 待渲染列表
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awaitRenderList:[],
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// 当前展示页码数据
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showPage:1
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}
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},
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mounted() {
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if(this.$props.status == 'success'){
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this.startRender();
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}
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},
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methods: {
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// 监听高度变化
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onHeight(height, tag) {
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/**
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* 这个为实际渲染后 CSS 中 margin-buttom 的值，本示例默认为20rpx
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* 用于解决实际渲染后因为数据条数关系，高度差计算偏差的问题
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* */
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let marginBottom = uni.upx2px(20);
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// console.log(`左高：${this.leftHeight},右高：${this.rightHeight},当前高：${height},插入方向：${tag}`)
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if (tag == 'left') {
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this.leftHeight += (height + marginBottom);
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} else {
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this.rightHeight += (height + marginBottom);
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}
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this.renderList();
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},
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// 组件点击事件
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onClick(index, tag){
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// 对应的数据
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if(tag == 'left'){
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this.$emit("click",this.leftList[index],index,tag);
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}else{
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this.$emit("click",this.rightList[index],index,tag);
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}
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},
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// 渲染列表，这里实现瀑布流的左右分栏
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renderList() {
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// 待渲染长度为 0 时表示已渲染完成
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if(this.awaitRenderList.length < 1){
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this.showPage++;
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this.$emit("done");
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// 为防止 js 数值类型最大值溢出，当高度值大于 1亿时重置高度
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if(this.leftHeight > 100000000){
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if(this.leftHeight > this.rightHeight){
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this.leftHeight = 2;
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this.rightHeight = 1;
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}else{
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this.leftHeight = 1;
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this.rightHeight = 2;
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}
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}
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return;
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}
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let item = {
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...this.awaitRenderList.splice(0,1)[0],
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// 当前数据添加当前页面标识
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_current_page:this.showPage,
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// 当前数据添加一个渲染id，解决 v-for 重复会出现不执行 load 的 BUG
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_render_id:new Date().getTime()
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};
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if(this.leftHeight > this.rightHeight){
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this.rightList.push(item);
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}else{
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this.leftList.push(item);
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}
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},
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// 重置数据
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resetData(){
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this.leftHeight = 0;
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this.rightHeight = 0;
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this.leftList = [];
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this.rightList = [];
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this.awaitRenderList = [];
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// 当前展示页码数据
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this.showPage = 1;
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},
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// 启动渲染
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startRender(){
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if(!this.showList){
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this.resetData();
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return;
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}
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if(!this.$props.list || this.$props.list.length < 1){
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console.log('河浪瀑布流插件提示：当前数据为空，不会触发列表渲染');
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return;
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}
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// 若本次渲染为 重置 则先恢复组件的默认参数
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if(this.$props.reset){
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this.resetData();
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}
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this.awaitRenderList = [...this.$props.list];
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this.renderList();
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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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.waterfall-box {
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width: 100%;
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>view {
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width: 334rpx; margin-right: 18rpx;
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&:last-child{ margin-right: 0; }
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}
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.list-item{
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margin-bottom: 0;
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// 设置透明，默认是可视的
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opacity: 0;
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// 默认超出隐藏，不影响加载中的文字显示效果
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overflow: hidden;
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height: 0;
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&.show{
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margin-bottom: 20rpx;
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opacity: 1;
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overflow: auto;
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height: auto;
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}
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}
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}
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.h-flex-x {
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display: flex;
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flex-direction: row;
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flex-wrap: nowrap;
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justify-content: flex-start;
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align-items: flex-start;
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align-content: flex-start;
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&.h-flex-2 {
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>view {
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width: 50%;
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}
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}
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}
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</style> |