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rc-waterfall

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rc-waterfall

Waterfall component for React

  • 1.0.10
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rc-waterfall

Build Status

demo

Install

rc-waterfall

Development

# install
npm install --save rc-waterfall

# run
npm run dev

# build
npm run build

Example

local: http://localhost:3002/

online: http://mapleliu.com/rc-waterfall/

Usage demo

import Waterfall from 'rc-waterfall';
...
<Waterfall
    source = {[...]}
    columnWidth = {200}
    isOnlyImg
    renderItem = {(ci,si,url)=><div><img src={url}/><h4>{si}</h4></div>}
    getTarget = {()=>window}
/>

API

参数说明类型默认值可选值
source图片资源列表array--
columnWidth单列宽度【单位px】number210-
isOnlyImg是否只根据图片高度进行排版booleanfalsetrue,false
renderItem渲染瀑布流块元素,回调参数【图片在列中位置ci:number,图片在source中位置si:number,图片url:string】function(ci,si,url):ReactNode(ci,si,url)=><img src={url}/>-
getTarget设置需要监听其滚动事件的元素,值为一个返回对应 DOM 元素的函数function():HTMLElement()=>window-

Ideas

初始化

  • 通过列宽【columnWidth】与容器【父级元素】宽度算出可显示列数columnNum,生成对应数量的列元素列表columns,且每列有一个图片元素【如果图片数量足够】
  • 执行图片缓存与添加图片元素操作

添加图片元素操作【图片元素实际指renderItem方法返回的ReactDom元素】

  • 判断如果需要添加图片元素,查找最短列并添加图片元素,执行完成后,继续执行添加图片元素操作
  • 判断如果不需要添加图片元素,操作停止

查找最短列

  • 如果根据图片高度排版【isOnlyImg:true】,图片缓存完成后会被添加到一个虚拟dom列表domColumns中,根据domColumns中各列的图片高度和查找最短列
  • 如果根据实际元素高度排版【isOnlyImg:false】,列元素渲染完成后的dom元素会被添加domColumns中,根据domColumns中各列dom元素的实际高度查找最短列

执行添加图片元素时机

  • 初始化完成
  • 上一次添加图片元素渲染完成后
  • getTarget返回的dom滚动条监听事件触发时

判断是否需要添加图片元素

  • 图片是否已全部加载完
  • 图片元素是否已渲染到指定位置

优化处理

  • 图片提前缓存,提升滚动时的流畅度
  • 优化shouldComponentUpdate,避免重复渲染

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Package last updated on 16 Jan 2018

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