React Leaflet中带有弹出窗口的1k +标记的性能问题

时间:2020-07-22 14:23:20

标签: leaflet react-leaflet

我有一个带有React Leaflet库的React应用程序,并且我正在一个小镇上显示地图中每座建筑物的标记。我总共有大约5k个标记,并且一个过滤器仅显示我想要的标记。

但是,我注意到下面的代码对我的性能产生了巨大的影响。我已经看过了诸如PixiOverlay和标记聚类之类的其他选择,但是前者将当前代码库迁移到其中相当复杂,而后者根本无法解决我的问题。

我当前的代码:

import React, {
    useRef, useEffect, useContext, useState,
} from 'react';
import ReactDOMServer from 'react-dom/server';
import {
    Marker, useLeaflet, Popup, Tooltip, CircleMarker, Circle,
} from 'react-leaflet';

import L from 'leaflet';
import styled from 'styled-components';

interface IProps {
    coords: [number, number]
    description: string,
    name: string
}

let timeoutPopupRef: any = null;
let timeoutPopupRefClose: any = null;

const DynamicMarker: React.FC<IProps> = ({ coords, description, name }) => {
    const markerRef = useRef<any>(null);
    const popupRef = useRef<Popup>(null);
    const tooltipRef = useRef<Tooltip>(null);
    const leaflet = useLeaflet();

    const divIcon: L.DivIcon = L.divIcon({
        iconSize: [25, 25],
        className: 'marker-white',
    });

    const onComponentMount = () => {
        if (!leaflet.map) return;
        if (!markerRef.current) return;

        const mapZoom: number = leaflet.map.getZoom();

        if (popupRef.current) {
            if (mapZoom <= 17) {
                markerRef.current.leafletElement.unbindPopup();
            } else if (mapZoom > 17) {
                markerRef.current.leafletElement.bindPopup(popupRef.current!.leafletElement);
            }
        }

        if (tooltipRef.current) {
            if (mapZoom <= 15) {
                markerRef.current.leafletElement.unbindTooltip();
            } else if (mapZoom > 15) {
                markerRef.current.leafletElement.bindTooltip(tooltipRef.current!.leafletElement);
            }
        }

        leaflet.map!.on('zoomend', onMapZoomEnd);
    };
    useEffect(onComponentMount, []);

    const onMapZoomEnd = () => {
        if (!markerRef.current) return;
        if (!popupRef.current) return;
        if (!leaflet.map) return;

        const zoom = leaflet.map.getZoom();

        if (zoom < 17) {
            if (!markerRef.current!.leafletElement.isPopupOpen()) {
                markerRef.current!.leafletElement.unbindPopup();
            }
        } else if (zoom >= 17) {
            markerRef.current!.leafletElement.bindPopup(popupRef.current.leafletElement);
        }
    };

    const handlePopupVisible = (value: boolean) => {
        if (!markerRef.current) return;
        if (timeoutPopupRefClose) clearTimeout(timeoutPopupRefClose);

        if (value) {
            if (!markerRef.current!.leafletElement.isPopupOpen()) {
                timeoutPopupRef = setTimeout(() => {
                markerRef.current!.leafletElement.openPopup();
                }, 400);
            }
        } else {
            if (timeoutPopupRef) {
                clearTimeout(timeoutPopupRef);
            }

            if (markerRef.current!.leafletElement.isPopupOpen()) {
                timeoutPopupRefClose = setTimeout(() => {
                markerRef.current!.leafletElement.closePopup();
                }, 100);
            }
        }
    };

    const onComponentDismount = () => {
        leaflet.map!.off('zoomend', onMapZoomEnd);

        if (!markerRef.current) return;
        markerRef.current.leafletElement.remove();
    };
    useEffect(() => onComponentDismount, []);

    return (
        <Marker
            icon={divIcon}
            position={coords}
            onmouseover={() => handlePopupVisible(true)}
            onmouseout={() => handlePopupVisible(false)}
            ref={markerRef}
        >
            <Popup className="custom-popup-content" ref={popupRef} closeButton={false}>
                <div
                    onMouseEnter={() => handlePopupVisible(true)}
                    onMouseLeave={() => handlePopupVisible(false)}
                >
                    <img
                        className="popup-img"
                        alt='image'
                        src='https://cdn.discordapp.com/attachments/578931223775281162/644181902215086094/default_geocode-1x.png'
                    />
                    <div className="popup-content">
                        <span className="popup-content-title">{name}</span>
                        {description && <span className="popup-content-subtitle">{description}</span>}
                    </div>
                </div>
            </Popup>
        </Marker>
            
    );
};

export default DynamicMarker;

如果地图缩放比例低于阈值,则上面的代码将弹出式窗口与标记解除绑定,并在缩放比例高于阈值时将其绑定。我还对标记组件上的onMouseOveronMouseOut事件实现了事件处理程序,以在用户将标记图标悬停在鼠标上时打开我的弹出窗口,并且只有当光标没有悬停在弹出窗口上方时,它才会关闭弹出窗口或标记图标。

当我放大或缩小显示2k标记时,地图冻结约5-10秒,并更新Map导出的react-leaflet组件内的所有组件。

1 个答案:

答案 0 :(得分:1)

在通过react-leaflet-markercluster对标记聚类进行测试之后,我注意到性能问题仍然存在。我尝试注释掉作为子代传递给标记器组件的Popup组件,而我遇到的滞后问题也消失了。

考虑到这一点,我意识到我的瓶颈实际上是在DOM中渲染2k弹出窗口,即使它们不可见。因此,经过反复试验,我遇到了一个解决方案:状态。

我添加了一个名为shouldDrawPopup的布尔状态,其默认值为false,并且仅在handlePopupVisible函数内部更改了它的值。此布尔状态的值仅在以下情况下会更改:

  • 地图缩放超出阈值;和
  • 弹出窗口未打开

然后,我将组件的render功能更改为仅在shouldDrawPopup状态为true时才包含弹出窗口:

    return (
        {shouldDrawPopup && (
            <Marker
                icon={divIcon}
                position={coords}
                onmouseover={() => handlePopupVisible(true)}
                onmouseout={() => handlePopupVisible(false)}
                ref={markerRef}
            >
                <Popup className="custom-popup-content" ref={popupRef} closeButton={false}>
                    <div
                        onMouseEnter={() => handlePopupVisible(true)}
                        onMouseLeave={() => handlePopupVisible(false)}
                    >
                        <img
                            className="popup-img"
                            alt='image'
                            src='https://cdn.discordapp.com/attachments/578931223775281162/644181902215086094/default_geocode-1x.png'
                        />
                        <div className="popup-content">
                            <span className="popup-content-title">{name}</span>
                            {description && <span className="popup-content-subtitle">{description}</span>}
                        </div>
                    </div>
                </Popup>
            </Marker>
        )}     
    );

如果有人对这个问题有其他解决方案或任何反馈,请随时分享!