105 lines
2.3 KiB
Vue
105 lines
2.3 KiB
Vue
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<template>
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<view class="u-waterfall">
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<view id="u-left-column" class="u-column"><slot name="left" :leftList="leftList"></slot></view>
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<view id="u-right-column" class="u-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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props: {
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value: {
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type: Array,
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required: true,
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default: function() {
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return [];
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}
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},
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addTime: {
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type: [Number, String],
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default: 200
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},
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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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},
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data() {
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return {
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leftList: [],
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rightList: [],
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tempList: [],
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}
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},
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watch: {
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copyFlowList(nVal, oVal) {
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let startIndex = Array.isArray(oVal) && oVal.length > 0 ? oVal.length : 0;
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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.tempList = this.cloneData(this.copyFlowList);
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this.splitData();
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},
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computed: {
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copyFlowList() {
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return this.cloneData(this.value);
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}
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},
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methods: {
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async splitData() {
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if (!this.tempList.length) return;
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let leftRect = await this.$uGetRect('#u-left-column');
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let rightRect = await this.$uGetRect('#u-right-column');
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// 如果左边小于或等于右边，就添加到左边，否则添加到右边
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let item = this.tempList[0];
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if(!item) return;
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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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// 这里是为了保证第一和第二张添加时，左右都能有内容
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// 因为添加第一张，实际队列的高度可能还是0，这时需要根据队列元素长度判断下一个该放哪边
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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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cloneData(data) {
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return JSON.parse(JSON.stringify(data));
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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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.u-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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}
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.u-column {
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display: flex;
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flex: 1;
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flex-direction: column;
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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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