@globalfishingwatch/react-map-gl/dist/esm/components/layer.js

A React wrapper for MapboxGL-js and overlay API.

import _slicedToArray from "@babel/runtime/helpers/esm/slicedToArray";
import _defineProperty from "@babel/runtime/helpers/esm/defineProperty";
import _objectWithoutProperties from "@babel/runtime/helpers/esm/objectWithoutProperties";

function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); keys.push.apply(keys, symbols); } return keys; }

function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { _defineProperty(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }

import { useContext, useEffect, useMemo, useState, useRef } from 'react';
import PropTypes from 'prop-types';
import MapContext from './map-context';
import assert from '../utils/assert';
import deepEqual from '../utils/deep-equal';
var LAYER_TYPES = {
  fill: 'fill',
  line: 'line',
  symbol: 'symbol',
  circle: 'circle',
  'fill-extrusion': 'fill-extrusion',
  raster: 'raster',
  background: 'background',
  heatmap: 'heatmap',
  hillshade: 'hillshade'
};
var propTypes = {
  type: PropTypes.oneOf(Object.keys(LAYER_TYPES)).isRequired,
  id: PropTypes.string,
  source: PropTypes.string,
  beforeId: PropTypes.string
};

function diffLayerStyles(map, id, props, prevProps) {
  var _props$layout = props.layout,
      layout = _props$layout === void 0 ? {} : _props$layout,
      _props$paint = props.paint,
      paint = _props$paint === void 0 ? {} : _props$paint,
      filter = props.filter,
      minzoom = props.minzoom,
      maxzoom = props.maxzoom,
      beforeId = props.beforeId,
      otherProps = _objectWithoutProperties(props, ["layout", "paint", "filter", "minzoom", "maxzoom", "beforeId"]);

  if (beforeId !== prevProps.beforeId) {
    map.moveLayer(id, beforeId);
  }

  if (layout !== prevProps.layout) {
    var prevLayout = prevProps.layout || {};

    for (var key in layout) {
      if (!deepEqual(layout[key], prevLayout[key])) {
        map.setLayoutProperty(id, key, layout[key]);
      }
    }

    for (var _key in prevLayout) {
      if (!layout.hasOwnProperty(_key)) {
        map.setLayoutProperty(id, _key, undefined);
      }
    }
  }

  if (paint !== prevProps.paint) {
    var prevPaint = prevProps.paint || {};

    for (var _key2 in paint) {
      if (!deepEqual(paint[_key2], prevPaint[_key2])) {
        map.setPaintProperty(id, _key2, paint[_key2]);
      }
    }

    for (var _key3 in prevPaint) {
      if (!paint.hasOwnProperty(_key3)) {
        map.setPaintProperty(id, _key3, undefined);
      }
    }
  }

  if (!deepEqual(filter, prevProps.filter)) {
    map.setFilter(id, filter);
  }

  if (minzoom !== prevProps.minzoom || maxzoom !== prevProps.maxzoom) {
    map.setLayerZoomRange(id, minzoom, maxzoom);
  }

  for (var _key4 in otherProps) {
    if (!deepEqual(otherProps[_key4], prevProps[_key4])) {
      map.setLayerProperty(id, _key4, otherProps[_key4]);
    }
  }
}

function createLayer(map, id, props) {
  if (map.style && map.style._loaded) {
    var options = _objectSpread(_objectSpread({}, props), {}, {
      id: id
    });

    delete options.beforeId;
    map.addLayer(options, props.beforeId);
  }
}

function updateLayer(map, id, props, prevProps) {
  assert(props.id === prevProps.id, 'layer id changed');
  assert(props.type === prevProps.type, 'layer type changed');

  try {
    diffLayerStyles(map, id, props, prevProps);
  } catch (error) {
    console.warn(error);
  }
}

var layerCounter = 0;

function Layer(props) {
  var context = useContext(MapContext);
  var propsRef = useRef({
    id: props.id,
    type: props.type
  });

  var _useState = useState(0),
      _useState2 = _slicedToArray(_useState, 2),
      setStyleLoaded = _useState2[1];

  var id = useMemo(function () {
    return props.id || "jsx-layer-".concat(layerCounter++);
  }, []);
  var map = context.map;
  useEffect(function () {
    if (map) {
      var forceUpdate = function forceUpdate() {
        return setStyleLoaded(function (version) {
          return version + 1;
        });
      };

      map.on('styledata', forceUpdate);
      return function () {
        map.off('styledata', forceUpdate);

        if (map.style && map.style._loaded) {
          map.removeLayer(id);
        }
      };
    }

    return undefined;
  }, [map]);
  var layer = map && map.style && map.getLayer(id);

  if (layer) {
    updateLayer(map, id, props, propsRef.current);
  } else {
    createLayer(map, id, props);
  }

  propsRef.current = props;
  return null;
}

Layer.propTypes = propTypes;
export default Layer;
//# sourceMappingURL=layer.js.map