encode method Null safety

Implementation

Object encode() {
  return <Object?>[
    rotateEnabled,
    pinchToZoomEnabled,
    scrollEnabled,
    simultaneousRotateAndPinchToZoomEnabled,
    pitchEnabled,
    scrollMode?.index,
    doubleTapToZoomInEnabled,
    doubleTouchToZoomOutEnabled,
    quickZoomEnabled,
    focalPoint?.encode(),
    pinchToZoomDecelerationEnabled,
    rotateDecelerationEnabled,
    scrollDecelerationEnabled,
    increaseRotateThresholdWhenPinchingToZoom,
    increasePinchToZoomThresholdWhenRotating,
    zoomAnimationAmount,
    pinchPanEnabled,
  ];
}