166 lines
5.2 KiB
Vue
166 lines
5.2 KiB
Vue
<template>
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<view class="tn-waterfall-class tn-waterfall">
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<view id="tn-waterfall-left" class="tn-waterfall__column"><slot name="left" :leftList="leftList"></slot></view>
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<view id="tn-waterfall-right" class="tn-waterfall__column"><slot name="right" :rightList="rightList"></slot></view>
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</view>
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</template>
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<script>
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export default {
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name: 'tn-waterfall',
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props: {
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// 瀑布流数据
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value: {
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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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// 数据的id值，根据id值对数据执行删除操作
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// 如数据为：{id: 1, name: 'tuniao'}，那么该值设置为id
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idKey: {
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type: String,
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default: 'id'
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},
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// 每次插入数据的事件间隔，间隔越长能保证两列高度相近，但是用户体验不好
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// 单位ms
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addTime: {
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type: Number,
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default: 200
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}
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},
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computed: {
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// 破坏value变量引用，否则数据会保持不变
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copyValue() {
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return this.cloneData(this.value)
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}
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},
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watch: {
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copyValue(nVal, oVal) {
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// 取出数组发生变化的部分
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let startIndex = Array.isArray(oVal) && oVal.length > 0 ? oVal.length : 0
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// 拼接原有数据
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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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data() {
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return {
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// 左列表
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leftList: [],
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// 右列表
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rightList: [],
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// 临时列表
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tempList: []
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}
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},
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mounted() {
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this.tempList = this.cloneData(this.copyValue)
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this.splitData()
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},
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methods: {
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// 拆分数据
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async splitData() {
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if (!this.tempList.length) return
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let leftRect = await this._tGetRect('#tn-waterfall-left')
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let rightRect = await this._tGetRect('#tn-waterfall-right')
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let item = this.tempList[0]
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// 因为经过上面两个await节点查询和定时器，数组有可能会变成空[]，导致item的值为undefined
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// 解决多次快速滚动会导致数据乱的问题
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if (!item) return
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// 如果左边小于或者等于右边，就添加到左边，否则添加到右边
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if (leftRect.height < rightRect.height) {
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this.leftList.push(item)
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} else if (leftRect.height > rightRect.height) {
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this.rightList.push(item)
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} else {
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// 为了保证前两项添加时，左右两边都还没有内容，这时候根据队列长度判断下一项该放在哪一边
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if (this.leftList.length <= this.rightList.length) {
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this.leftList.push(item)
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} else {
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this.rightList.push(item)
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}
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}
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// 移除临时数组中已处理的数据
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this.tempList.splice(0, 1)
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// 如果还有数据则继续执行
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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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} else {
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this.$emit('finish')
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}
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},
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// 复制对象和数组（深度复制不会影响原对象和数组）
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cloneData(data) {
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return JSON.parse(JSON.stringify(data))
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},
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// 清空数据列表
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clear() {
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this.leftList = []
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this.rightList = []
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this.$emit('input', [])
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this.tempList = []
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},
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// 清除指定的某一条数据，根据id来实现
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remove(id) {
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// 如果查找不到就返回-1
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let index = -1
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index = this.leftList.findIndex(val => val[this.idKey] == id)
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if (index != -1) {
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// 如果index不等于-1，说明已经找到了指定的数据
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this.leftList.splice(index, 1)
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} else {
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// 同理于上面的方法
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index = this.rightList.findIndex(val => val[this.idKey] == id)
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if (index != -1) this.rightList.splice(index, 1)
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}
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// 同时删除父组件对应的数据
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index = this.value.findIndex(val => val[this.idKey] == id)
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if (index != -1) this.$emit('input', this.value.splice(index, 1))
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},
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// 修改指定数据的属性
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modify(id, key, value) {
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// 如果查找不到就返回-1
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let index = -1
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index = this.leftList.findIndex(val => val[this.idKey] == id)
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if (index != -1) {
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// 如果index不等于-1，说明已经找到了指定的数据
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this.leftList[index][key] = value
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} else {
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// 同理于上面的方法
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index = this.rightList.findIndex(val => val[this.idKey] == id)
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if (index != -1) this.rightList[index][key] = value
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}
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// 同时删除父组件对应的数据
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index = this.value.findIndex(val => val[this.idKey] == id)
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if(index != -1) {
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let data = this.cloneData(this.value)
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data[index][key] = value
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this.$emit('input', data)
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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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.tn-waterfall {
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display: flex;
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flex-direction: row;
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align-items: flex-start;
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&__column {
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display: flex;
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flex-direction: column;
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flex: 1;
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height: auto;
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}
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}
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</style>
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