react-bkoi-gl/dist/components/layer.js

React components for Barikoi GL JS

import { useContext, useEffect, useMemo, useState, useRef } from "react";
import { MapContext } from "./map.js";
import assert from "../utils/assert.js";
import { deepEqual } from "../utils/deep-equal.js";
function updateLayer(map, id, props, prevProps) {
  assert(props.id === prevProps.id, "layer id changed");
  assert(props.type === prevProps.type, "layer type changed");
  if (props.type === "custom" || prevProps.type === "custom") {
    return;
  }
  const {
    layout = {},
    paint = {},
    filter,
    minzoom,
    maxzoom,
    beforeId
  } = 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);
  }
}
function createLayer(map, id, props) {
  if (map.style && map.style._loaded && (!("source" in props) || map.getSource(props.source))) {
    const options = {
      ...props,
      id
    };
    delete options.beforeId;
    map.addLayer(options, props.beforeId);
  }
}
let layerCounter = 0;
export function Layer(props) {
  const map = useContext(MapContext).map.getMap();
  const propsRef = useRef(props);
  const [, setStyleLoaded] = useState(0);
  const id = useMemo(() => props.id || `jsx-layer-${layerCounter++}`, []);
  useEffect(() => {
    if (map) {
      const forceUpdate = () => setStyleLoaded(version => version + 1);
      map.on("styledata", forceUpdate);
      forceUpdate();
      return () => {
        map.off("styledata", forceUpdate);
        if (map.style && map.style._loaded && map.getLayer(id)) {
          map.removeLayer(id);
        }
      };
    }
    return undefined;
  }, [map]);
  const layer = map && map.style && map.getLayer(id);
  if (layer) {
    try {
      updateLayer(map, id, props, propsRef.current);
    } catch (error) {
      console.warn(error);
    }
  } else {
    createLayer(map, id, props);
  }
  propsRef.current = props;
  return null;
}
//# sourceMappingURL=layer.js.map