<template>
  <WaterfallFlow :list="list"/>
</template>
<script setup lang="ts">
import WaterfallFlow from "@/components/WaterfallFlow.vue";
import {reactive} from "vue";
type listType = {
  height:number,
  color:string
}
// 隨機(jī)生成100個(gè)高度和顏色的對(duì)象
let list = reactive<listType[]>([
  ...Array.from({length:100},()=>({
    height:Math.floor(Math.random()*250)+50,
    color:`rgb(${Math.floor(Math.random()*255)},${Math.floor(Math.random()*255)},${Math.floor(Math.random()*255)})`
  }))
 ])
</script>

<template>
  <div class="wraps">
    <div v-for="item in list" class="item" :style="{
      left: item.left + 'px',
      top: item.top + 'px',
      height: item.height + 'px',
      backgroundColor: item.color,
    }"></div>
  </div>
</template>
<script setup lang="ts">
import {defineProps, onMounted} from "vue"
const props = defineProps<{
  list: any[]
}>()
const initLayout = () => {
  // 上下左右間隙距離
  let margin = 10
  // 每個(gè)元素的寬度
  let elWidth = 120 + margin
  // 每行展示的列數(shù)
  let colNumber = Math.floor(document.querySelector(".app-content").clientWidth / elWidth)
  // 存放元素高度的list
  let heightList = []
  // 遍歷所有元素
  for (let i = 0; i < props.list.length; i++) {
    let el = props.list[i]
    // i小于colNumber表示第一行元素
    if(i < colNumber){
      el.top = 0
      el.left = elWidth * i
      heightList.push(el.height)
    }else{
      // 找出最小的高度
      let minHeight = Math.min(...heightList)
      // 找出最小高度的索引
      let minHeightIndex = heightList.indexOf(minHeight)
      // 設(shè)置元素的位置
      el.left = elWidth * minHeightIndex
      el.top = minHeight + margin
      // 更新高度集合
      heightList[minHeightIndex] = minHeight + el.height + margin
    }
  }
}
// 監(jiān)聽(tīng)app-content元素的寬度變化
window.onresize = () => {
  initLayout()
}
onMounted(() => {
  initLayout()
})
</script>
<style scoped lang="scss">
.wraps{
  height: 100%;
  position: relative;
  .item{
    position: absolute;
    width: 120px;
  }
}
</style>