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- <template>
- <view class="u-waterfall">
- <!-- 新增支持多列布局 -->
- <view
- v-for="(column, index) in columnList"
- :key="index"
- :ref="`u-column-${index}`"
- :id="`u-column-${index}`"
- class="u-column"
- >
- <slot name="column"
- :colIndex="index"
- :colList="column">
- </slot>
- <slot name="left"
- :colIndex="index"
- :leftList="column">
- </slot>
- <template v-if="!$slots['left'] && !$slots['column']" v-for="(item, itemIndex) in column" :key="itemIndex">
- <slot :item="item" :itemIndex="itemIndex"></slot>
- </template>
- </view>
- </view>
- </template>
- <script>
- /**
- * waterfall 瀴布流
- * @description 这是一个瀑布流形式的组件,对原组件进行升级已经支持自定义列数模式,便于适配不同屏幕。搭配loadMore 加载更多组件,让您开箱即用,眼前一亮。
- * @tutorial https://uview-plus.jiangruyi.com/components/waterfall.html
- * @property {Array} flow-list 用于渲染的数据
- * @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)
- * @property {String Number} columns 瀑布流列数,默认为2,设置为auto时自动根据屏幕宽度调整列数
- * @example <u-waterfall :flowList="flowList"></u-waterfall>
- */
- import { mpMixin } from '../../libs/mixin/mpMixin';
- import { mixin } from '../../libs/mixin/mixin';
- import { sleep } from '../../libs/function/index';
- export default {
- name: "u-waterfall",
- props: {
- // #ifdef VUE2
- value: {
- // 瀑布流数据
- type: Array,
- required: true,
- default: function() {
- return [];
- }
- },
- // #endif
- // #ifdef VUE3
- modelValue: {
- // 瀑布流数据
- type: Array,
- required: true,
- default: function() {
- return [];
- }
- },
- // #endif
- // 每次向结构插入数据的时间间隔,单位ms
- // 单位ms
- addTime: {
- type: [Number, String],
- default: 200
- },
- // id值,用于清除某一条数据时,根据此idKey名称找到并移除,如数据为{idx: 22, name: 'lisa'}
- // 那么该把idKey设置为idx
- idKey: {
- type: String,
- default: 'id'
- },
- // 瀑布流列数
- columns: {
- type: [Number, String],
- default: 2
- },
- // 瀑布流最小列数
- columnsMin: {
- type: [Number, String],
- default: 2
- },
- // 最小列宽
- minColumnWidth: {
- type: Number,
- default: 230
- }
- },
- mixins: [mpMixin, mixin],
- data() {
- return {
- columnList: [[]], // 存储每列的数据
- children: [],
- // 用于标记是否已经初始化
- initialized: false,
- windowWidth: 375,
- windowHeight: 0
- }
- },
- watch: {
- copyFlowList: {
- handler(nVal, oVal) {
- if (!nVal || nVal.length == 0) {
- this.clear(false);
- } else {
- if (this.columnList.length == 1) {
- this.initColumnList()
- }
- // 取差值,即这一次数组变化新增的部分
- let startIndex = Array.isArray(oVal) && oVal.length > 0 ? oVal.length : 0;
- // 直接处理数据,不再使用tempList和splitData
- this.handleData(nVal.slice(startIndex));
- }
- },
- immediate: true
- },
- columns: {
- handler() {
- this.initColumnList();
- // 重新分配数据
- if (this.copyFlowList.length > 0) {
- this.redistributeData();
- }
- },
- immediate: false
- }
- },
- created() {
- this.initColumnList();
- },
- mounted() {
- this.initialized = true;
- // 添加窗口大小变化监听
- // #ifdef H5
- if (this.columns === 'auto') {
- uni.onWindowResize(this.handleWindowResize);
- }
- // #endif
- },
- // 添加beforeUnmount生命周期清理事件监听
- // #ifdef VUE3
- beforeUnmount() {
- // #ifdef H5
- if (this.columns === 'auto') {
- uni.offWindowResize(this.handleWindowResize);
- }
- // #endif
- },
- // #endif
- // #ifdef VUE2
- beforeDestroy() {
- // #ifdef H5
- if (this.columns === 'auto') {
- window.removeEventListener('resize', this.handleWindowResize);
- }
- // #endif
- }
- // #endif
- computed: {
- // 破坏flowList变量的引用,否则watch的结果新旧值是一样的
- copyFlowList() {
- // #ifdef VUE3
- if (!this.modelValue || this.modelValue.length == 0) {
- // console.log('clear');
- return [];
- } else {
- return this.cloneData(this.modelValue);
- }
- // #endif
- // #ifdef VUE2
- return this.cloneData(this.value);
- // #endif
- }
- },
- emits: ['update:modelValue'],
- methods: {
- // 初始化列数据数组
- initColumnList() {
- this.windowWidth = uni.getSystemInfoSync().windowWidth;
- const cols = this.getColumnsCount();
- // console.log(cols)
- this.columnList = Array.from({ length: cols }, () => []);
- },
-
- // 获取列数,支持auto模式
- getColumnsCount() {
- if (this.columns === 'auto') {
- // 列间距为10rpx(约等于7px)
- const columnGap = 7;
- // 计算可容纳的列数
- let columnCount = Math.max(1, Math.floor(this.windowWidth / (this.minColumnWidth + columnGap)));
- if (columnCount < this.columnsMin) {
- columnCount = this.columnsMin
- }
- return columnCount;
- }
- return parseInt(this.columns) || 2;
- },
-
- // 窗口大小变化处理函数
- handleWindowResize(res) {
- this.windowWidth = res.size.windowWidth
- this.windowHeight = res.size.windowHeight
- // 防抖处理,避免频繁触发
- if (this.resizeTimer) {
- clearTimeout(this.resizeTimer);
- }
- this.resizeTimer = setTimeout(() => {
- const newColumnsCount = this.getColumnsCount();
- const oldColumnsCount = this.columnList.length;
-
- // 只有列数发生变化时才重新分配数据
- if (newColumnsCount !== oldColumnsCount) {
- this.redistributeData();
- }
- }, 300);
- },
-
- // 重新分配所有数据
- async redistributeData() {
- // 清空所有列
- this.initColumnList();
- // 保存所有数据
- const allData = this.cloneData(this.copyFlowList);
- // 重新分配数据
- this.handleData(allData);
- },
-
- // 处理新增数据
- async handleData(newData) {
- if (!newData || newData.length === 0) return;
-
- // 初始化列高度数组
- const columnHeights = new Array(this.columnList.length).fill(0);
-
- // 获取各列当前高度
- for (let i = 0; i < this.columnList.length; i++) {
- try {
- const rect = await this.$uGetRect(`#u-column-${i}`);
- // console.log(`#u-column-${i}`, rect.height)
- columnHeights[i] = rect.height || 0;
- } catch (e) {
- columnHeights[i] = 0;
- }
- }
-
- // 分配新数据到最短的列
- for (let item of newData) {
- const minHeightIndex = columnHeights.indexOf(Math.min(...columnHeights));
- // console.log('this.columnList', this.columnList)
- this.columnList[minHeightIndex].push(item);
-
- // 获取实际渲染后的元素高度而不是估算
- await sleep(30)
- this.$nextTick(async () => {
- try {
- const rect = await this.$uGetRect(`#u-column-${minHeightIndex}`);
- // console.log(`#u-column-${minHeightIndex}`, rect.height)
- if (rect.height) {
- columnHeights[minHeightIndex] = rect.height
- }
- } catch (e) {
- // console.log(e)
- // columnHeights[i] = 0;
- }
- });
- // this.$nextTick(async () => {
- // try {
- // // 等待DOM更新后获取实际高度
- // const lastIndex = this.columnList[minHeightIndex].length - 1;
- // const el = this.$refs[`u-column-${minHeightIndex}`][0].children[lastIndex];
- // if (el) {
- // const rect = await this.$uGetRect(el);
- // const actualHeight = rect.height || 100;
- // columnHeights[minHeightIndex] += actualHeight;
- // } else {
- // // 备用方案:如果无法获取实际高度,则使用默认值
- // columnHeights[minHeightIndex] += 100;
- // }
- // } catch (e) {
- // // 出错时使用默认高度
- // console.log(e)
- // columnHeights[minHeightIndex] += 100;
- // }
- // });
- }
- },
- // 复制而不是引用对象和数组
- cloneData(data) {
- return JSON.parse(JSON.stringify(data));
- },
-
- // 清空数据列表
- clear(bak = true) {
- this.initColumnList();
- // 同时清除父组件列表中的数据
- if (bak) {
- // #ifdef VUE2
- this.$emit('input', []);
- // #endif
- // #ifdef VUE3
- this.$emit('update:modelValue', []);
- // #endif
- }
- },
-
- // 清除某一条指定的数据,根据id实现
- remove(id) {
- // 遍历所有列查找并删除数据
- for (let i = 0; i < this.columnList.length; i++) {
- const index = this.columnList[i].findIndex(val => val[this.idKey] == id);
- if (index !== -1) {
- this.columnList[i].splice(index, 1);
- break;
- }
- }
-
- // 同时清除父组件的数据中的对应id的条目
- // #ifdef VUE2
- const valueIndex = this.value.findIndex(val => val[this.idKey] == id);
- if (valueIndex !== -1) {
- const newValue = this.cloneData(this.value);
- newValue.splice(valueIndex, 1);
- this.$emit('input', newValue);
- }
- // #endif
- // #ifdef VUE3
- const modelValueIndex = this.modelValue.findIndex(val => val[this.idKey] == id);
- if (modelValueIndex !== -1) {
- const newModelValue = this.cloneData(this.modelValue);
- newModelValue.splice(modelValueIndex, 1);
- this.$emit('update:modelValue', newModelValue);
- }
- // #endif
- },
-
- // 修改某条数据的某个属性
- modify(id, key, value) {
- let found = false;
- let targetItem = null;
-
- // 在所有列中查找数据
- for (let i = 0; i < this.columnList.length; i++) {
- const index = this.columnList[i].findIndex(val => val[this.idKey] == id);
- if (index !== -1) {
- // 修改对应key的值
- this.columnList[i][index][key] = value;
- targetItem = this.columnList[i][index];
- found = true;
- break;
- }
- }
-
- if (found && targetItem) {
- // 修改父组件的数据中的对应id的条目
- // #ifdef VUE2
- const valueIndex = this.value.findIndex(val => val[this.idKey] == id);
- if (valueIndex !== -1) {
- let data = this.cloneData(this.value);
- data[valueIndex][key] = value;
- this.$emit('input', data);
- }
- // #endif
- // #ifdef VUE3
- const modelValueIndex = this.modelValue.findIndex(val => val[this.idKey] == id);
- if (modelValueIndex !== -1) {
- let data = this.cloneData(this.modelValue);
- data[modelValueIndex][key] = value;
- this.$emit('update:modelValue', data);
- }
- // #endif
- }
- }
- }
- }
- </script>
- <style lang="scss" scoped>
- .u-waterfall {
- @include flex;
- flex-direction: row;
- align-items: flex-start;
- }
- .u-column {
- @include flex;
- flex: 1;
- flex-direction: column;
- overflow: hidden;
- /* #ifndef APP-NVUE */
- height: 100%;
- /* #endif */
- // 添加列之间的间距
- &:not(:first-child) {
- margin-left: 10rpx;
- }
- }
- .u-image {
- /* #ifndef APP-NVUE */
- max-width: 100%;
- /* #endif */
- }
- </style>
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