reactjs - Deck.gl 如何在点击时显示弹出窗口

Question

设置:

使用react-map-gl的基本react应用程序显示 map ，顶部带有deck.gl ScatterplotLayer以可视化数据

目标:

1) 将 map 上的点显示为给定半径和颜色的圆圈。
2) 当用户单击圆圈时，工具提示/弹出窗口应显示更多有关该圆圈的数据(包含在提供的数据中)，直到用户单击为止(与此图基本相同，但单击而不是悬停，http://uber.github.io/deck.gl/#/documentation/layer-catalog/scatterplot-layer .仅供引用，我查看了此代码，并且悬停逻辑已被删除，我认为是为了简单起见)。

问题:

我已经完成了第 1 点，但无法让第 2 点起作用。我所能证明的最远的数据就是记录到控制台。

注意:

我并没有和react-tooltip结婚——如果有更好的方法的话，我不介意把它完全删除。我只需要保留mapbox和deck.gl。

数据:https://gist.github.com/NikkiChristofi/bf79ca37028b29b50cffb215360db999

deckgl-overlay.js

import React, {Component} from 'react';
import ReactTooltip from 'react-tooltip';
import DeckGL, {ScatterplotLayer} from 'deck.gl';

export default class DeckGLOverlay extends Component {

  static get defaultViewport() {
    return {
      longitude: 0,
      latitude: 0,
      zoom: 2,
      maxZoom: 16,
      pitch: 0,
      bearing: 0
    };
  }

# in this method I want to update the variable tooltipText with
# whatever object data has been clicked. 
# The console log successfully logs the right data (i.e. the third 
# element in the array), but the tooltip doesn't even show 

  onClickHandler = (info) => {
    let dataToShow = info ? info.object[2] : "not found";
    this.tooltipText = dataToShow;
    console.log(dataToShow);
  }

  render() {
    const {viewport, lowPerformerColor, highPerformerColor, data, radius, smallRadius, largeRadius} = this.props;

    if (!data) {
      return null;
    }

    const layer = new ScatterplotLayer({
      id: 'scatter-plot',
      data,
      radiusScale: radius,
      radiusMinPixels: 0.25,
      getPosition: d => [d[1], d[0], 0],
      getColor: d => d[2] > 50 ? lowPerformerColor : highPerformerColor,
      getRadius: d => d[2] < 25 || d[2] > 75 ? smallRadius : largeRadius,
      updateTriggers: {
        getColor: [lowPerformerColor, highPerformerColor]
      },
      pickable: true, 
      onClick: info => this.onClickHandler(info),
      opacity: 0.3   
    });

    return (
      <DeckGL {...viewport} layers={ [layer] } data-tip={this.tooltipText}>
        <ReactTooltip />
      </DeckGL>
    );
  }
}

app.js

import React, {Component} from 'react';
import {render} from 'react-dom';
import MapGL from 'react-map-gl';
import DeckGLOverlay from './deckgl-overlay.js';
import {json as requestJson} from 'd3-request';

const MAPBOX_TOKEN = process.env.MAPBOX_TOKEN; // eslint-disable-line
const lowPerformerColor = [204, 0, 0];
const highPerformerColor = [0, 255, 0];
const smallRadius = 500;
const largeRadius = 1000;

const DATA_URL = 'https://gist.github.com/NikkiChristofi/bf79ca37028b29b50cffb215360db999';
export default class App extends Component {

  constructor(props) {
    super(props);
    this.state = {
      viewport: {
        ...DeckGLOverlay.defaultViewport,
        width: 500,
        height: 500
      },
      data: null
    };

    requestJson(DATA_URL, (error, response) => {
      if (!error) {
        console.log(response);
        this.setState({data: response});
      }
      else{
          console.log(error);
      }
    });
  }

  componentDidMount() {
    window.addEventListener('resize', this._resize.bind(this));
    this._resize();
  }

  _resize() {
    this._onViewportChange({
      width: window.innerWidth,
      height: window.innerHeight
    });
  }

  _onViewportChange(viewport) {
    this.setState({
      viewport: {...this.state.viewport, ...viewport}
    });
  }

  render() {
    const {viewport, data} = this.state;

    return (
      <MapGL
        {...viewport}
        onViewportChange={this._onViewportChange.bind(this)}
        mapboxApiAccessToken={MAPBOX_TOKEN}
        mapStyle='mapbox://styles/mapbox/dark-v9'>
        <DeckGLOverlay viewport={viewport}
          data={data}
          lowPerformerColor={lowPerformerColor}
          highPerformerColor={highPerformerColor}
          smallRadius={smallRadius}
          largeRadius={largeRadius}
          radius={300}
          />
      </MapGL>
    );
  }
}

Answer 1

想出了一个办法。

解决方案

我将 onClick 事件冒泡到 MapGL 图层，并使用 Popup 元素来显示数据。

所以在 app.js 中:
1)从react-map-gl导入Popup元素

import MapGL, { Popup } from 'react-map-gl';

2)设置坐标状态和“信息”(在弹出窗口中显示)

constructor(props) {
    super(props);
    this.state = {
      viewport: {
        ...DeckGLOverlay.defaultViewport,
        width: 500,
        height: 500
      },
      data: null,
      coordinates: [-0.13235092163085938,51.518250335096376],
      info: "Hello"
    };

3)创建用新数据设置状态的回调方法(信息只是数据中的一个元素，可以是您想要在弹出窗口中显示的任何内容)

myCallback = (info) => {
    console.log(info);
    if(info){
      this.setState({coordinates: info.lngLat, info: info.object[2]});
    }
  }

4)渲染弹窗并引用DeckGL层的回调方法

 return (
      <MapGL
        {...viewport}
        {...this.props}
        onViewportChange={this._onViewportChange.bind(this)}
        mapboxApiAccessToken={MAPBOX_TOKEN}
        mapStyle='mapbox://styles/mapbox/dark-v9'>
        <Popup
          longitude={this.state.coordinates[0]}
          latitude={this.state.coordinates[1]}>
          <div style={style}>
            <p>{this.state.info}</p>
          </div>
        </Popup>
        <DeckGLOverlay viewport={viewport}
          data={data}
          lowPerformerColor={lowPerformerColor}
          highPerformerColor={highPerformerColor}
          smallRadius={smallRadius}
          largeRadius={largeRadius}
          radius={300}
          callbackFromParent={this.myCallback}
          />
      </MapGL>
    );

以及在dececkgl-overlay.js中:
1)将数据信息输入父级(app.js)方法

onClick: info => this.props.callbackFromParent(info),

(显然删除了deckoverlay.js中的React-tooltip元素和onClick事件处理程序来清理)