Class BrowserCodeReader

src/browser/BrowserCodeReader.ts:21–1241

 * Base class for browser code reader.
 */
export class BrowserCodeReader {
  /**
   * If navigator is present.
   */
  public get hasNavigator() {
    return typeof navigator !== 'undefined';
  }

  /**
   * If mediaDevices under navigator is supported.
   */
  public get isMediaDevicesSuported() {
    return this.hasNavigator && !!navigator.mediaDevices;
  }

  /**
   * If enumerateDevices under navigator is supported.
   */
  public get canEnumerateDevices() {
    return !!(
      this.isMediaDevicesSuported && navigator.mediaDevices.enumerateDevices
    );
  }

  /**
   * This will break the loop.
   */
  private _stopContinuousDecode = false;

  /**
   * This will break the loop.
   */
  private _stopAsyncDecode = false;

  /**
   * Delay time between decode attempts made by the scanner.
   */
  protected _timeBetweenDecodingAttempts: number = 0;

  /** Time between two decoding tries in milli seconds. */
  get timeBetweenDecodingAttempts(): number {
    return this._timeBetweenDecodingAttempts;
  }

  /**
   * Change the time span the decoder waits between two decoding tries.
   *
   * @param {number} millis Time between two decoding tries in milli seconds.
   */
  set timeBetweenDecodingAttempts(millis: number) {
    this._timeBetweenDecodingAttempts = millis < 0 ? 0 : millis;
  }

  /**
   * The HTML canvas element, used to draw the video or image's frame for decoding.
   */
  protected captureCanvas: HTMLCanvasElement;
  /**