leaflet-components/src/components/leaflet-circle-marker.ts

import { CircleMarker } from 'leaflet';
import { defineProps, num, str, on } from '../core/props.ts';
import { registerChildren, unregisterChildren } from '../core/register.ts';
import {
  WithProps,
  buildOptions,
  isPathStyleAttr,
  numAttr,
  updatePathStyle,
} from '../core/utils.ts';

const PROPS = defineProps({
  lat: num(),
  lng: num(),
  radius: num(10),
  color: str('#3388ff'),
  weight: num(3),
  opacity: num(1.0),
  fill: on(),
  fillColor: str('#3388ff'),
  fillOpacity: num(0.2),
});

export class LeafletCircleMarker extends WithProps(HTMLElement, PROPS) {
  #obj?: CircleMarker;
  #syncing = false;

  connectedCallback() {
    this.#obj = new CircleMarker(
      [numAttr(this, PROPS, 'lat'), numAttr(this, PROPS, 'lng')],
      buildOptions(this, PROPS, ['lat', 'lng']),
    );
    this.#obj.on('move', this.#onMove, this);
    registerChildren(this, this.#obj);
  }

  disconnectedCallback() {
    this.#obj?.off('move', this.#onMove, this);
    unregisterChildren(this);
    this.#obj?.remove();
    this.#obj = undefined;
  }

  get leafletObject() {
    return this.#obj;
  }

  attributeChangedCallback(name: string, _old: string | null, val: string | null) {
    if (!this.#obj || this.#syncing) return;
    if (name === 'lat' || name === 'lng') {
      this.#obj.setLatLng([numAttr(this, PROPS, 'lat'), numAttr(this, PROPS, 'lng')]);
    } else if (name === 'radius') {
      this.#obj.setRadius(numAttr(this, PROPS, 'radius'));
    } else if (isPathStyleAttr(name)) {
      updatePathStyle(this.#obj, name, val);
    }
  }

  #onMove() {
    if (!this.#obj || this.#syncing) return;
    this.#syncing = true;
    const pos = this.#obj.getLatLng();
    this.setAttribute('lat', `${pos.lat}`);
    this.setAttribute('lng', `${pos.lng}`);
    this.#syncing = false;
  }
}

customElements.define('leaflet-circle-marker', LeafletCircleMarker);