startup method

Implementation

void startup() {
  // get reached level from local storage
  if (this._localStorage.containsKey(_reachedLevelKey)) {
    this._reachedLevel = int.parse(this._localStorage[_reachedLevelKey]);
  }
  this._activeLevel = this.getReachedLevel();

  // (07/2020) Changed the flow because on iOS 13+ the permission for gyro sensor needs to be requested
  RegExp isMobileRegEx = new RegExp(r"(iPad)|(iPhone)|(iPod)|(android)|(webOS)|(ipad)|(iphone)|(Android)");

  if (!isMobileRegEx.hasMatch(window.navigator.userAgent)) {
    // on desktop devices
    this.showMessageNoSupportForGyro();
  } else if ((window.innerHeight / window.screen.height) < 0.92) {
    // shown if not started in fullscreen (0.92 because on iphone fs is not
    // possible and with the notch it's even smaller)
    this.showWelcomeScreenOnMobileDevices();
    this.gyroAvailable = true;
  } else {
    // shown if already in fullscreen, e.g. web app
    this.showLevelOverview();
    this.gyroAvailable = true;
  }
}