@goongmaps/goong-map-react/dist/es6/components/layer.js

A fork of react-map-gl. React components for Goong JS

import { useContext, useEffect, useMemo, useState, useRef } from 'react';
import * as PropTypes from 'prop-types';
import MapContext from './map-context';
import assert from '../utils/assert';
import deepEqual from '../utils/deep-equal';
const LAYER_TYPES = ['fill', 'line', 'symbol', 'circle', 'fill-extrusion', 'raster', 'background', 'heatmap', 'hillshade', 'sky'];
const propTypes = {
  type: PropTypes.oneOf(LAYER_TYPES).isRequired,
  id: PropTypes.string,
  source: PropTypes.string,
  beforeId: PropTypes.string
};
function diffLayerStyles(map, id, props, prevProps) {
  const {
    layout = {},
    paint = {},
    filter,
    minzoom,
    maxzoom,
    beforeId,
    ...otherProps
  } = props;
  if (beforeId !== prevProps.beforeId) {
    map.moveLayer(id, beforeId);
  }
  if (layout !== prevProps.layout) {
    const prevLayout = prevProps.layout || {};
    for (const key in layout) {
      if (!deepEqual(layout[key], prevLayout[key])) {
        map.setLayoutProperty(id, key, layout[key]);
      }
    }
    for (const key in prevLayout) {
      if (!layout.hasOwnProperty(key)) {
        map.setLayoutProperty(id, key, undefined);
      }
    }
  }
  if (paint !== prevProps.paint) {
    const prevPaint = prevProps.paint || {};
    for (const key in paint) {
      if (!deepEqual(paint[key], prevPaint[key])) {
        map.setPaintProperty(id, key, paint[key]);
      }
    }
    for (const key in prevPaint) {
      if (!paint.hasOwnProperty(key)) {
        map.setPaintProperty(id, key, undefined);
      }
    }
  }
  if (!deepEqual(filter, prevProps.filter)) {
    map.setFilter(id, filter);
  }
  if (minzoom !== prevProps.minzoom || maxzoom !== prevProps.maxzoom) {
    map.setLayerZoomRange(id, minzoom, maxzoom);
  }
  for (const key in otherProps) {
    if (!deepEqual(otherProps[key], prevProps[key])) {
      map.setLayerProperty(id, key, otherProps[key]);
    }
  }
}
function createLayer(map, id, props) {
  if (map.style && map.style._loaded) {
    const options = {
      ...props,
      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);
  }
}
let layerCounter = 0;
function Layer(props) {
  const context = useContext(MapContext);
  const propsRef = useRef({
    id: props.id,
    type: props.type
  });
  const [, setStyleLoaded] = useState(0);
  const id = useMemo(() => props.id || "jsx-layer-".concat(layerCounter++), []);
  const {
    map
  } = context;
  useEffect(() => {
    if (map) {
      const forceUpdate = () => setStyleLoaded(version => version + 1);
      map.on('styledata', forceUpdate);
      return () => {
        map.off('styledata', forceUpdate);
        if (map.style && map.style._loaded) {
          map.removeLayer(id);
        }
      };
    }
    return undefined;
  }, [map]);
  const 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