remax 虚拟滚动列表组件（暂时只支持微信，支付宝没测试）

只支持等高项的列表

Install

npm install remax-virtual-list-zhou --save-dev
# or 
yarn add -D remax-virtual-list-zhou

Usage

import React, { useEffect, useMemo, useRef, useState } from "react";
import { View, Text, Image } from "remax/one";
import { ScrollView } from "remax/wechat";
import { useNativeEffect } from "remax";
import styles from "./index.css";
import VirtualList from "@/components/VirtualList";

const mockData: any[] = [];
for (let i = 0; i < 1000; i++) {
  mockData.push({
    text: `第${i}项`,
  });
}

export default () => {
  const [data, setData] = useState(mockData.slice(0, 10));
  const ref = useRef<any>();
  const handleScroll = (e: any) => {
    ref.current?.onScroll(e);
  };

  const systemInfo = useMemo(() => {
    return wx.getSystemInfoSync();
  }, []);

  const [scrollViewHeightPx, setScrollViewHeightPx] = useState(0);
  useNativeEffect(() => {
    wx.createSelectorQuery()
      .select("#scroll-view")
      .boundingClientRect(function (rect) {
        setScrollViewHeightPx(rect.height);
      })
      .exec();
  }, [data]);
  return (
    <View className={styles.app}>
      <ScrollView
        onScrollToLower={() => {
          setTimeout(() => {
            setData(data.concat(mockData.slice(data.length, data.length + 10)));
          }, 100);
        }}
        style={{ height: "100vh" }}
        scrollY
        onScroll={handleScroll}
        lowerThreshold={350}
        id="scroll-view"
      >
        <VirtualList
          scrollViewHeightPx={scrollViewHeightPx}
          windowWidth={systemInfo.windowWidth}
          placeholderImage="https://sl-online-oss.shulidata.com/jiyang/wechat/placeImage.png"
          ref={ref}
          data={data}
          itemHeight={300}
          renderItem={(item, index) => (
            <View key={item.text} style={{ height: 300 }}>
              {item.text}
            </View>
          )}
          onExposure={(index) => {
            console.log("Exposure", index);
          }}
          renderBottom={() => (
            <View className={styles.loading}>加载中。。</View>
          )}
        />
      </ScrollView>
    </View>
  );
};

Options

| Option | type | default | desc | | ------------------ | -------- | ------- | ------------------------------------------------------------------------- | | windowWidth | number | 无 | 必填，可使用窗口宽度，单位px ,通过wx.getSystemInfoSync()获取,用于单位转换 | | data | array | [] | 必填，列表数据 | | renderItem | function | 无 | 必填，每一项的渲染方法 | | placeholderImage | string | 无 | 建议填，占位图片 | | overscanCount | number | 12 | 一屏数量，默认共显示3*12项 | | headerHeight | number | 无 | 渲染列表头部时必填 | | renderHeader | function | 无 | 渲染列表头部 | | renderBottom | function | 无 | 渲染列表底部 | | onExposure | function | 无 | 曝光方法，(index)=>{} ,index从0开始，数组下标 | | scrollViewHeightPx | function | 无 | 单位px，曝光方法必要参数 |