瀑布流實作效果

實作思路
同樣采用常見的兩欄瀑布流布局,分别用數組goodsLeftList和goodsRightList儲存左右兩欄要渲染對象, 初始化時,加載一張圖檔,然後依次把圖檔加到欄高更低的一欄中。 主要使用的是image的@load事件。每次通過計算放入左右清單 儲存所有對象的數組将該對象删除 圖檔加載完畢觸發下個子產品實作懶加載的效果
代碼了解
<view class="waterfall_left" >
<view class="waterfall_list" v-for="(item,index) in goodsLeftList" :key="index" ">
<view class="waterfall_list_img">
<image :src="item.goods_main_pic" mode="widthFix" @load="considerPush"></image>
</view>
<view class="msg-box">
<view class="name single-omit">{{item.goods_name}}</view>
<view class="price-box flex-align-center">
<view class="unit"><text>¥</text>{{item.goods_sku.sku_sale_price}}</view>
</view>
</view>
</view>
</view>
<view class="waterfall_right" >
<view class="waterfall_list" v-for="(item,index) in goodsRightList" :key="index">
<view class="waterfall_list_img">
<image :src="item.goods_main_pic" mode="widthFix" @load="considerPush"></image>
</view>
<view class="msg-box">
<view class="name single-omit">{{item.goods_name}}</view>
<view class="price-box flex-align-center">
<view class="unit"><text>¥</text>{{item.goods_sku.sku_sale_price}}</view>
</view>
</view>
</view>
</view>
<script>
export default {
props: {
list: { type: Array, required: true },
},
data() {
return {
// 左側商品清單
goodsLeftList:[],
// 右側商品清單
goodsRightList:[],
// 元件資料備份
newList:[],
}
},
created() {
this.touchOff();// 觸發排列
},
mounted(){},
watch: {
list(newValue, oldValue) {
this.touchOff()
},
},
computed:{},
methods: {
// 觸發重新排列
touchOff(){
this.newList = [...this.list];
this.goodsLeftList = [];
this.goodsRightList = [];
if(this.newList.length != 0){
this.goodsLeftList.push(this.newList.shift());//觸發排列
}
},
// 計算排列
considerPush(){
if(this.newList.length == 0)return;//沒有資料了
let leftH = 0,rightH = 0;//左右高度
var query = uni.createSelectorQuery().in(this);
query.selectAll('.waterfall_left').boundingClientRect()
query.selectAll('.waterfall_right').boundingClientRect()
query.exec(res=>{
leftH = res[0].length != 0 ? res[0][0].height : 0;//防止查詢不到做個處理
rightH = res[1].length != 0 ? res[1][0].height : 0;
if(leftH == rightH || leftH < rightH){
// 相等 || 左邊小
this.goodsLeftList.push(this.newList.shift());
}else{
// 右邊小
this.goodsRightList.push(this.newList.shift());
}
});
},
}
}
</script>