ISA-Frontend/apps/adapter/scan/src/lib/scandit/scandit.scan-adapter.ts

import { Injectable } from '@angular/core';
import { Observable, Subscriber } from 'rxjs';
import { ScanAdapter } from '../scan-adapter';
import { Overlay } from '@angular/cdk/overlay';

import { configure } from 'scandit-sdk';
// import { ScanditModalComponent } from './scandit-modal';
import { Config } from '@core/config';
import { ComponentPortal } from '@angular/cdk/portal';
import { ScanditOverlayComponent } from './scandit-overlay.component';
import { EnvironmentService } from '@core/environment';

@Injectable()
export class ScanditScanAdapter implements ScanAdapter {
  readonly name = 'Scandit';

  constructor(private readonly _config: Config, private _overlay: Overlay, private _environmentService: EnvironmentService) {}

  async init(): Promise<boolean> {
    if (this._environmentService.isTablet()) {
      await configure(this._config.get('licence.scandit'), {
        engineLocation: '/scandit/',
      });

      return true;
    }

    return false;
  }

  scan(): Observable<string> {
    return new Observable((observer) => {
      const overlay = this.createOverlay();

      const portal = this.createPortal();

      const ref = overlay.attach(portal);

      const sub = new Subscriber();

      const complete = () => {
        overlay.detach();
        ref.destroy();
        sub.unsubscribe();
        sub.complete();
        observer.complete();
      };

      sub.add(
        overlay.backdropClick().subscribe(() => {
          complete();
        })
      );

      ref.instance.onScan((code) => {
        observer.next(code);
        complete();
      });

      ref.instance.onClose(() => {
        complete();
      });

      return complete;
    });
  }

  createOverlay() {
    const overlay = this._overlay.create({
      positionStrategy: this._overlay.position().global().centerHorizontally().centerVertically(),
      hasBackdrop: true,
    });

    return overlay;
  }

  createPortal() {
    const portal = new ComponentPortal(ScanditOverlayComponent);

    return portal;
  }
}