243 lines
6.3 KiB
Vue
243 lines
6.3 KiB
Vue
<template>
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<view class="u-waterfall">
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<view
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v-for="(columnList, columnIndex) in columns"
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:key="columnIndex"
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:id="`u-column-${columnIndex}`"
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class="u-column"
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>
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<slot :columnList="columnList" :columnIndex="columnIndex"></slot>
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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 props from './props.js';
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import mixin from '../../libs/mixin/mixin'
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import mpMixin from '../../libs/mixin/mpMixin';
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/**
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* waterfall 瀑布流
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* @description 这是一个瀑布流形式的组件,内容分为多列,结合uView的懒加载组件效果更佳。
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* 或者没有利用vue作用域插槽的做法,uView的瀑布流实现了真正的 组件化,
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* 搭配LazyLoad 懒加载和loadMore 加载更多组件,让您开箱即用,眼前一亮。
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* @tutorial https://uview.d3u.cn/components/waterfall.html
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* @property {Array} value/modelValue 用于渲染的数据
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* @property {String Number} add-time 单条数据添加到队列的时间间隔,单位ms,见上方注意事项说明(默认200)
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* @property {String Number} column 瀑布流列数(默认2)
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* @example <u-waterfall v-model="list" :column="2"></u-waterfall>
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*/
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export default {
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name: "u-waterfall",
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mixins: [mpMixin, mixin, props],
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data() {
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return {
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columns: [], // 动态列数组
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tempList: [],
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children: []
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}
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},
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watch: {
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copyFlowList(nVal, oVal) {
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// 取差值,即这一次数组变化新增的部分
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let startIndex = Array.isArray(oVal) && oVal.length > 0 ? oVal.length : 0;
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// 拼接上原有数据
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this.tempList = this.tempList.concat(this.cloneData(nVal.slice(startIndex)));
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this.splitData();
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}
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},
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mounted() {
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this.initColumns();
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this.tempList = this.cloneData(this.copyFlowList);
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this.$nextTick(() => {
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uni.$u.sleep(10).then(() => {
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this.splitData();
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})
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})
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},
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computed: {
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// 破坏flowList变量的引用,否则watch的结果新旧值是一样的
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copyFlowList() {
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return this.cloneData(this.flowList);
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},
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flowList() {
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// #ifdef VUE2
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return this.value;
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// #endif
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// #ifdef VUE3
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return this.modelValue;
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// #endif
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},
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},
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// #ifdef VUE3
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emits: ['update:modelValue'],
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// #endif
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methods: {
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// 初始化列数组
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initColumns() {
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const columnCount = parseInt(this.column);
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this.columns = [];
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for (let i = 0; i < columnCount; i++) {
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this.columns.push([]);
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}
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},
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async splitData() {
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if (!this.tempList.length) {
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return;
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}
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if(!this.columns.length) {
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return;
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}
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// 获取所有列的高度
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const columnHeights = [];
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for (let i = 0; i < this.columns.length; i++) {
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try {
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const rect = await this.$uGetRect(`#u-column-${i}`);
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columnHeights.push(rect ? rect.height : 0);
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} catch (error) {
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columnHeights.push(0);
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}
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}
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// 找到最短的列
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let minHeight = Math.min(...columnHeights);
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let minIndex = columnHeights.indexOf(minHeight);
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// 如果所有列高度相同,使用轮询分配
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if (columnHeights.every(height => height === minHeight)) {
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minIndex = this.getShortestColumnIndex();
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}
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let item = this.tempList[0];
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// 解决多次快速上拉后,可能数据会乱的问题
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if (!item){
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return;
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}
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// 将数据添加到最短的列
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this.columns[minIndex].push(item);
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// 移除临时列表的第一项
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this.tempList.splice(0, 1);
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// 如果临时数组还有数据,继续循环
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if (this.tempList.length) {
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setTimeout(() => {
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this.splitData();
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}, this.addTime)
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}
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},
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// 获取元素最少的列索引(用于高度相同时的轮询分配)
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getShortestColumnIndex() {
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let minLength = Math.min(...this.columns.map(col => col.length));
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return this.columns.findIndex(col => col.length === minLength);
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},
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// 复制而不是引用对象和数组
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cloneData(data) {
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return JSON.parse(JSON.stringify(data));
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},
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// 清空数据列表
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clear() {
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for (let i = 0; i < this.columns.length; i++) {
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this.columns[i] = [];
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}
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// 同时清除父组件列表中的数据
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// #ifdef VUE2
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this.$emit('input', []);
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// #endif
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// #ifdef VUE3
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this.$emit('update:modelValue', []);
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// #endif
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this.tempList = [];
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},
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// 清除某一条指定的数据,根据id实现
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remove(id) {
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// 如果findIndex找不到合适的条件,就会返回-1
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let index = -1;
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let columnIndex = -1;
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// 在所有列中查找要删除的数据
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for (let i = 0; i < this.columns.length; i++) {
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index = this.columns[i].findIndex(val => val[this.idKey] == id);
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if (index !== -1) {
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columnIndex = i;
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break;
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}
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}
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// 如果找到了,删除对应的数据
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if (index !== -1 && columnIndex !== -1) {
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this.columns[columnIndex].splice(index, 1);
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}
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// 同时清除父组件的数据中的对应id的条目
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index = this.flowList.findIndex(val => val[this.idKey] == id);
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if (index !== -1) {
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// #ifdef VUE2
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this.$emit('input', this.flowList.splice(index, 1));
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// #endif
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// #ifdef VUE3
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this.$emit('update:modelValue', this.flowList.splice(index, 1));
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// #endif
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}
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},
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// 修改某条数据的某个属性
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modify(id, key, value) {
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// 如果findIndex找不到合适的条件,就会返回-1
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let index = -1;
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let columnIndex = -1;
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// 在所有列中查找要修改的数据
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for (let i = 0; i < this.columns.length; i++) {
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index = this.columns[i].findIndex(val => val[this.idKey] == id);
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if (index !== -1) {
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columnIndex = i;
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break;
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}
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}
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// 如果找到了,修改对应的数据
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if (index !== -1 && columnIndex !== -1) {
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this.columns[columnIndex][index][key] = value;
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}
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// 修改父组件的数据中的对应id的条目
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index = this.flowList.findIndex(val => val[this.idKey] == id);
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if (index !== -1) {
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// 首先复制一份value的数据
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let data = this.cloneData(this.flowList);
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// 修改对应索引的key属性的值为value
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data[index][key] = value;
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// 修改父组件通过v-model绑定的变量的值
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// #ifdef VUE2
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this.$emit('input', data);
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// #endif
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// #ifdef VUE3
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this.$emit('update:modelValue', data);
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// #endif
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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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<style lang="scss" scoped>
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@import '../../libs/css/components.scss';
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.u-waterfall {
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@include flex(row);
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align-items: flex-start;
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}
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.u-column {
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@include flex(column);
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flex: 1;
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height: auto;
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}
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.u-image {
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width: 100%;
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}
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</style>
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