@orca-fe/x-map/esm/layers/BaseLayer.js

import AbstractLayer from './AbstractLayer';
export default class BaseLayer extends AbstractLayer {
    constructor(options = {}) {
        super();
        this.add = (marker) => {
            this.markers.add(marker);
            this.dom.appendChild(marker.dom);
            marker.setLayer(this);
        };
        this.remove = (marker) => {
            this.markers.delete(marker);
            if (this.dom.contains(marker.dom)) {
                this.dom.removeChild(marker.dom);
            }
            marker.setLayer(undefined);
        };
        const { style } = options;
        const dom = document.createElement('div');
        dom.style.position = 'absolute';
        dom.style.top = '0';
        dom.style.left = '0';
        dom.style.width = '0';
        dom.style.height = '0';
        dom.style.zIndex = '0';
        if (style) {
            Object.entries(style).forEach(([key, value]) => {
                dom.style[key] = value;
            });
        }
        this.dom = dom;
    }
    getSize() {
        const { clientWidth, clientHeight } = this.dom;
        return [clientWidth, clientHeight];
    }
}