@nebula.gl/layers/src/mode-handlers/two-click-polygon-handler.ts

A suite of 3D-enabled data editing layers, suitable for deck.gl

import { ClickEvent } from '../event-types';
import { ModeHandler, EditAction } from './mode-handler';

// TODO edit-modes: delete handlers once EditMode fully implemented
export class TwoClickPolygonHandler extends ModeHandler {
  handleClick(event: ClickEvent): EditAction | null | undefined {
    super.handleClick(event);

    const tentativeFeature = this.getTentativeFeature();
    const clickSequence = this.getClickSequence();

    if (
      clickSequence.length > 1 &&
      tentativeFeature &&
      tentativeFeature.geometry.type === 'Polygon'
    ) {
      const editAction = this.getAddFeatureOrBooleanPolygonAction(tentativeFeature.geometry);
      this.resetClickSequence();
      this._setTentativeFeature(null);
      return editAction;
    }

    return null;
  }
}