react-native-mapbox-gl/javascript/components/MapView.js

import React from 'react';
import PropTypes from 'prop-types';
import { NativeModules, requireNativeComponent } from 'react-native';
import { makePoint, makeLatLngBounds } from '../utils/geoUtils';

import {
  isFunction,
  isNumber,
  runNativeCommand,
  toJSONString,
  getFilter,
  IS_ANDROID,
} from '../utils';

const MapboxGL = NativeModules.MGLModule;

export const NATIVE_MODULE_NAME = 'RCTMGLMapView';

const RCTMGLMapView = requireNativeComponent(NATIVE_MODULE_NAME, MapView, {
  nativeOnly: { onMapChange: true, onAndroidCallback: true },
});

/**
 * MapView backed by Mapbox Native GL
 */
class MapView extends React.Component {
  static propTypes = {
    /**
     * Animates changes between pitch and bearing
     */
    animated: PropTypes.bool,

    /**
     * Initial center coordinate on map [lng, lat]
     */
    centerCoordinate: PropTypes.arrayOf(PropTypes.number),

    /**
     * Shows the users location on the map
     */
    showUserLocation: PropTypes.bool,

    /**
     * The mode used to track the user location on the map
     */
    userTrackingMode: PropTypes.number,

    /**
     * Initial heading on map
     */
    heading: PropTypes.number,

    /**
     * Initial pitch on map
     */
    pitch: PropTypes.number,

    /**
     * Style for wrapping React Native View
     */
    style: PropTypes.any,

    /**
     * Style URL for map
     */
    styleURL: PropTypes.string,

    /**
     * Initial zoom level of map
     */
    zoomLevel: PropTypes.number,

    /**
     * Min zoom level of map
     */
    minZoomLevel: PropTypes.number,

    /**
     * Max zoom level of map
     */
    maxZoomLevel: PropTypes.number,

    /**
     * Enable/Disable scroll on the map
     */
    scrollEnabled: PropTypes.bool,

    /**
     * Enable/Disable pitch on map
     */
    pitchEnabled: PropTypes.bool,

    /**
     * Enable/Disable rotation on map
     */
    rotateEnabled: PropTypes.bool,

    /**
     * Enable/Disable attribution on map. For iOS you need to add MGLMapboxMetricsEnabledSettingShownInApp=YES
     * to your Info.plist
     */
    attributionEnabled: PropTypes.bool,

    /**
     * Enable/Disable the logo on the map.
     */
    logoEnabled: PropTypes.bool,

    /**
     * Map press listener, gets called when a user presses the map
     */
    onPress: PropTypes.func,

    /**
    * Map long press listener, gets called when a user long presses the map
    */
    onLongPress: PropTypes.func,

    /**
    * This event is triggered whenever the currently displayed map region is about to change.
    */
    onRegionWillChange: PropTypes.func,

    /**
    * This event is triggered whenever the currently displayed map region is changing.
    */
    onRegionIsChanging: PropTypes.func,

    /**
    * This event is triggered whenever the currently displayed map region finished changing
    */
    onRegionDidChange: PropTypes.func,

    /**
    * This event is triggered when the map is about to start loading a new map style.
    */
    onWillStartLoadingMap: PropTypes.func,

    /**
    * This is triggered when the map has successfully loaded a new map style.
    */
    onDidFinishLoadingMap: PropTypes.func,

    /**
    * This event is triggered when the map has failed to load a new map style.
    */
    onDidFailLoadingMap: PropTypes.func,

    /**
    * This event is triggered when the map will start rendering a frame.
    */
    onWillStartRenderingFrame: PropTypes.func,

    /**
    * This event is triggered when the map finished rendering a frame.
    */
    onDidFinishRenderingFrame: PropTypes.func,

    /**
    * This event is triggered when the map fully finished rendering a frame.
    */
    onDidFinishRenderingFrameFully: PropTypes.func,

    /**
    * This event is triggered when the map will start rendering the map.
    */
    onWillStartRenderingMap: PropTypes.func,

    /**
    * This event is triggered when the map finished rendering the map.
    */
    onDidFinishRenderingMap: PropTypes.func,

    /**
    * This event is triggered when the map fully finished rendering the map.
    */
    onDidFinishRenderingMapFully: PropTypes.func,

    /**
    * This event is triggered when a style has finished loading.
    */
    onDidFinishLoadingStyle: PropTypes.func,

    /**
    * This event is triggered when a fly to animation is cancelled or completed after calling flyTo
    */
    onFlyToComplete: PropTypes.func,

    /**
     * This event is triggered once the camera is finished after calling setCamera
     */
    onSetCameraComplete: PropTypes.func,
  };

  static defaultProps = {
    animated: false,
    heading: 0,
    pitch: 0,
    scrollEnabled: true,
    pitchEnabled: true,
    rotateEnabled: true,
    attributionEnabled: true,
    logoEnabled: true,
    zoomLevel: 16,
    userTrackingMode: MapboxGL.UserTrackingModes.None,
    styleURL: MapboxGL.StyleURL.Street,
  };

  constructor (props) {
    super(props);

    this._onPress = this._onPress.bind(this);
    this._onLongPress = this._onLongPress.bind(this);
    this._onChange = this._onChange.bind(this);
    this._onAndroidCallback = this._onAndroidCallback.bind(this);

    this._callbackMap = new Map();
  }

  /**
   * Returns an array of rendered map features that intersect with a given point.
   *
   * @example
   * this._map.queryRenderedFeaturesAtPoint([30, 40], ['==', 'type', 'Point'], ['id1', 'id2'])
   *
   * @param  {Array<Number>} coordinate - A point expressed in the map view’s coordinate system.
   * @param  {Array=} filter - A set of strings that correspond to the names of layers defined in the current style. Only the features contained in these layers are included in the returned array.
   * @param  {Array=} layerIDs - A array of layer id's to filter the features by
   * @return {FeatureCollection}
   */
  async queryRenderedFeaturesAtPoint (coordinate, filter = [], layerIDs = []) {
    if (!coordinate || coordinate.length < 2) {
      throw new Error('Must pass in valid coordinate[lng, lat]');
    }

    const res = await this._runNativeCommand('queryRenderedFeaturesAtPoint', [
      coordinate,
      getFilter(filter),
      layerIDs,
    ]);

    if (IS_ANDROID) {
      return JSON.parse(res.data);
    }

    return res.data;
  }

  /**
   * Returns an array of rendered map features that intersect with the given rectangle,
   * restricted to the given style layers and filtered by the given predicate.
   *
   * @example
   * this._map.queryRenderedFeaturesInRect([30, 40, 20, 10], ['==', 'type', 'Point'], ['id1', 'id2'])
   *
   * @param  {Array<Number>} bbox - A rectangle expressed in the map view’s coordinate system.
   * @param  {Array=} filter - A set of strings that correspond to the names of layers defined in the current style. Only the features contained in these layers are included in the returned array.
   * @param  {Array=} layerIDs -  A array of layer id's to filter the features by
   * @return {FeatureCollection}
   */
  async queryRenderedFeaturesInRect (bbox, filter = [], layerIDs = []) {
    if (!bbox || bbox.length !== 4) {
      throw new Error('Must pass in a valid bounding box[top, right, bottom, left]');
    }
    const res = await this._runNativeCommand('queryRenderedFeaturesInRect', [
      bbox,
      getFilter(filter),
      layerIDs,
    ]);

    if (IS_ANDROID) {
      return JSON.parse(res.data);
    }

    return res.data;
  }

  /**
   * Map camera transitions to fit provided bounds
   *
   * @example
   * this.map.fitBounds([lng, lat], [lng, lat])
   * this.map.fitBounds([lng, lat], [lng, lat], 20, 1000) // padding for all sides
   * this.map.fitBounds([lng, lat], [lng, lat], [verticalPadding, horizontalPadding], 1000)
   * this.map.fitBounds([lng, lat], [lng, lat], [top, right, bottom, left], 1000)
   *
   * @param {Array<Number>} northEastCoordinates - North east coordinate of bound
   * @param {Array<Number>} southWestCoordinates - South west coordinate of bound
   * @param {Number=} padding - Camera padding for bound
   * @param {Number=} duration - Duration of camera animation
   * @return {void}
   */
  fitBounds (northEastCoordinates, southWestCoordinates, padding = 0, duration = 2000) {
    if (!this._nativeRef) {
      return;
    }

    let pad = {
      paddingLeft: 0,
      paddingRight: 0,
      paddingTop: 0,
      paddingBottom: 0,
    };

    if (Array.isArray(padding)) {
      if (padding.length === 2) {
        pad.paddingTop = padding[0];
        pad.paddingBottom = padding[0];
        pad.paddingLeft = padding[1];
        pad.paddingRight = padding[1];
      } else if (padding.length === 4) {
        pad.paddingTop = padding[0];
        pad.paddingRight = padding[1];
        pad.paddingBottom = padding[2];
        pad.paddingLeft = padding[3];
      }
    } else {
      pad.paddingLeft = padding;
      pad.paddingRight = padding;
      pad.paddingTop = padding;
      pad.paddingBottom = padding;
    }

    return this.setCamera({
      bounds: {
        ne: northEastCoordinates,
        sw: southWestCoordinates,
        ...pad,
      },
      duration: duration,
      mode: MapboxGL.CameraModes.Flight,
    });
  }

  /**
   * Map camera will fly to new coordinate
   *
   * @example
   * this.map.flyTo([lng, lat])
   * this.map.flyTo([lng, lat], 12000)
   *
   *  @param {Array<Number>} coordinates - Coordinates that map camera will jump too
   *  @param {Number=} duration - Duration of camera animation
   *  @return {void}
   */
  flyTo (coordinates, duration = 2000) {
    if (!this._nativeRef) {
      return Promise.reject('No native reference found');
    }
    return this.setCamera({
      centerCoordinate: coordinates,
      duration: duration,
      mode: MapboxGL.CameraModes.Flight,
    });
  }

  /**
   * Map camera will move to new coordinate at the same zoom level
   *
   * @example
   * this.map.moveTo([lng, lat], 200) // eases camera to new location based on duration
   * this.map.moveTo([lng, lat]) // snaps camera to new location without any easing
   *
   *  @param {Array<Number>} coordinates - Coordinates that map camera will move too
   *  @param {Number=} duration - Duration of camera animation
   *  @return {void}
   */
  moveTo (coordinates, duration = 0) {
    if (!this._nativeRef) {
      return Promise.reject('No native reference found');
    }
    return this.setCamera({
      centerCoordinate: coordinates,
      duration: duration,
    });
  }

  /**
   * Map camera will zoom to specified level
   *
   * @example
   * this.map.zoomTo(16)
   * this.map.zoomTo(16, 100)
   *
   * @param {Number} zoomLevel - Zoom level that the map camera will animate too
   * @param {Number=} duration - Duration of camera animation
   * @return {void}
   */
  zoomTo (zoomLevel, duration = 2000) {
    if (!this._nativeRef) {
      return Promise.reject('No native reference found');
    }
    return this.setCamera({
      zoom: zoomLevel,
      duration: duration,
      mode: MapboxGL.CameraModes.Flight,
    });
  }

  /**
   * Map camera will perform updates based on provided config. Advanced use only!
   *
   * @example
   * this.map.setCamera({
   *   centerCoordinate: [lng, lat],
   *   zoomLevel: 16,
   *   duration: 2000,
   * })
   *
   * this.map.setCamera({
   *   stops: [
   *     { pitch: 45, duration: 200 },
   *     { heading: 180, duration: 300 },
   *   ]
   * })
   *
   *  @param {Object} config - Camera configuration
   */
  setCamera (config = {}) {
    if (!this._nativeRef) {
      return;
    }

    let cameraConfig = {};

    if (config.stops) {
      cameraConfig.stops = [];

      for (let stop of config.stops) {
        cameraConfig.stops.push(this._createStopConfig(stop));
      }
    } else {
      cameraConfig = this._createStopConfig(config);
    }

    return this._runNativeCommand('setCamera', [cameraConfig]);
  }

  _runNativeCommand (methodName, args) {
    if (IS_ANDROID) {
      return new Promise ((resolve) => {
        const callbackID = '' + Date.now();
        this._addAddAndroidCallback(callbackID, resolve);
        args.unshift(callbackID);
        runNativeCommand(NATIVE_MODULE_NAME, methodName, this._nativeRef, args);
      });
    }
    return runNativeCommand(NATIVE_MODULE_NAME, methodName, this._nativeRef, args);
  }

  _createStopConfig (config = {}) {
    let stopConfig = {
      mode: isNumber(config.mode) ? config.mode : MapboxGL.CameraModes.Ease,
      pitch: config.pitch,
      heading: config.heading,
      duration: config.duration || 2000,
      zoom: config.zoom,
    };

    if (config.centerCoordinate) {
      stopConfig.centerCoordinate = toJSONString(makePoint(config.centerCoordinate));
    }

    if (config.bounds && config.bounds.ne && config.bounds.sw) {
      const { ne, sw, paddingLeft, paddingRight, paddingTop, paddingBottom } = config.bounds;
      stopConfig.bounds = toJSONString(makeLatLngBounds(ne, sw));
      stopConfig.boundsPaddingTop = paddingTop || 0;
      stopConfig.boundsPaddingRight = paddingRight || 0;
      stopConfig.boundsPaddingBottom = paddingBottom || 0;
      stopConfig.boundsPaddingLeft = paddingLeft || 0;
    }

    return stopConfig;
  }

  _addAddAndroidCallback (id, callback) {
    this._callbackMap.set(id, callback);
  }

  _removeAndroidCallback (id) {
    this._callbackMap.remove(id);
  }

  _onAndroidCallback (e) {
    const callbackID = e.nativeEvent.type;
    const callback = this._callbackMap.get(callbackID);

    if (!callback) {
      return;
    }

    this._callbackMap.delete(callbackID);
    callback.call(null, e.nativeEvent.payload);
  }

  _onPress (e) {
    if (isFunction(this.props.onPress)) {
      this.props.onPress(e.nativeEvent.payload);
    }
  }

  _onLongPress (e) {
    if (isFunction(this.props.onLongPress)) {
      this.props.onLongPress(e.nativeEvent.payload);
    }
  }

  _onChange (e) {
    const { type, payload } = e.nativeEvent;
    let propName = '';

    switch (type) {
      case MapboxGL.EventTypes.RegionWillChange:
        propName = 'onRegionWillChange';
        break;
      case MapboxGL.EventTypes.RegionIsChanging:
        propName = 'onRegionIsChanging';
        break;
      case MapboxGL.EventTypes.RegionDidChange:
        propName = 'onRegionDidChange';
        break;
      case MapboxGL.EventTypes.WillStartLoadinMap:
        propName = 'onWillStartLoadingMap';
        break;
      case MapboxGL.EventTypes.DidFinishLoadingMap:
        propName = 'onDidFinishLoadingMap';
        break;
      case MapboxGL.EventTypes.DidFailLoadingMap:
        propName = 'onDidFailLoadingMap';
        break;
      case MapboxGL.EventTypes.WillStartRenderingFrame:
        propName = 'onWillStartRenderingFrame';
        break;
      case MapboxGL.EventTypes.DidFinishRenderingFrame:
        propName = 'onDidFinishRenderingFrame';
        break;
      case MapboxGL.EventTypes.DidFinishRenderingFrameFully:
        propName = 'onDidFinishRenderingFrameFully';
        break;
      case MapboxGL.EventTypes.WillStartRenderingMap:
        propName = 'onWillStartRenderingMap';
        break;
      case MapboxGL.EventTypes.DidFinishRenderingMap:
        propName = 'onDidFinishRenderingMap';
        break;
      case MapboxGL.EventTypes.DidFinishRenderingMapFully:
        propName = 'onDidFinishRenderingMapFully';
        break;
      case MapboxGL.EventTypes.DidFinishLoadingStyle:
        propName = 'onDidFinishLoadingStyle';
        break;
    }

    if (propName.length) {
      this._handleOnChange(propName, payload);
    }
  }

  _handleOnChange (propName, payload) {
    if (isFunction(this.props[propName])) {
      this.props[propName](payload);
    }
  }

  _getCenterCoordinate () {
    if (!this.props.centerCoordinate) {
      return;
    }
    return toJSONString((makePoint(this.props.centerCoordinate)));
  }

  render () {
    let props = {
      animated: this.props.animated,
      centerCoordinate: this._getCenterCoordinate(),
      showUserLocation: this.props.showUserLocation,
      userTrackingMode: this.props.userTrackingMode,
      heading: this.props.heading,
      pitch: this.props.pitch,
      style: this.props.style,
      styleURL: this.props.styleURL,
      zoomLevel: this.props.zoomLevel,
      minZoomLevel: this.props.minZoomLevel,
      maxZoomLevel: this.props.maxZoomLevel,
      scrollEnabled: this.props.scrollEnabled,
      pitchEnabled: this.props.pitchEnabled,
      rotateEnabled: this.props.rotateEnabled,
      attributionEnabled: this.props.attributionEnabled,
      logoEnabled: this.props.logoEnabled,
    };

    const callbacks = {
      ref: (nativeRef) => this._nativeRef = nativeRef,
      onPress: this._onPress,
      onLongPress: this._onLongPress,
      onMapChange: this._onChange,
      onAndroidCallback: IS_ANDROID ? this._onAndroidCallback : undefined,
    };

    return (
      <RCTMGLMapView {...props} {...callbacks}>
        {this.props.children}
      </RCTMGLMapView>
    );
  }
}

export default MapView;