React Leaflet 中带有弹出窗口的 1k+ 标记的性能问题

问题描述 投票:0回答:2

我有一个带有 React Leaflet 库的 React 应用程序,我正在地图上的一个小镇上为每个建筑物显示一个标记。我总共有大约 5k 个标记,还有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性能造成了巨大的影响。我研究了一些替代方案,例如 PixiOverlay 和标记聚类,但前者将当前代码库迁移到其中非常复杂,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;

如果地图缩放低于阈值,上面的代码会解除弹出窗口与标记的绑定,并在缩放高于阈值时绑定它们。我还在标记组件上实现了

onMouseOver
onMouseOut
事件的事件处理程序,以便在用户将鼠标悬停在标记图标上时打开弹出窗口,并且仅当光标未悬停在弹出窗口或标记图标上时才会关闭弹出窗口.

当我放大或缩小并显示大约 2k 标记时,地图会冻结大约 5-10 秒,并更新由

Map
导出的
react-leaflet
组件内的所有组件。

leaflet react-leaflet
2个回答
3
投票

通过

react-leaflet-markercluster
对标记聚类进行测试后,我注意到性能问题仍然存在。我尝试注释掉作为子组件传递给标记组件的
Popup
组件,并且我遇到的滞后问题消失了。

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,即使它们是不可见的。因此,经过一番尝试和错误,我找到了一个解决方案:states。

我添加了一个名为

shouldDrawPopup
的布尔状态,默认值为
false
,并且仅在
handlePopupVisible
函数内更改了其值。仅当满足以下条件时,此布尔状态的值才会更改:

  • 地图缩放超过阈值;和
  • 弹出窗口未打开

然后我更改了组件的

render
函数,仅当
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>
        )}     
    );

如果有人对此问题有其他解决方案或任何反馈,请随时分享!


0
投票

这对我有用:

export const AutoOpenPopup = ({ children }) => {
    const popupRef = useRef(null);

    useEffect(() => {
        if (popupRef.current) {
            const marker = popupRef.current._source;
            if (marker) {
                marker.openPopup();
            }
        }
    }, []);

    return <Popup ref={popupRef}>{children}</Popup>;
};

我将它与这样的标记一起使用:

const handleMarkerClick = e => {
    setIsClicked(true);
};
<Marker eventHandlers={{
            click: handleMarkerClick,
        }}
>
  {isClicked && <AutoOpenPopup> Popup's content </AutoOpenPopup }
</Marker>
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