onScaleEnd method

void onScaleEnd(ScaleEndDetails details)

Called when a scale gesture ends.

Implementation

void onScaleEnd(ScaleEndDetails details) {
  if (!inertiaEnabled || _scaledDuringGesture || _ticker == null) return;

  final velocity = details.velocity.pixelsPerSecond;
  final speed = velocity.distance;
  if (speed < kMinFlingVelocity) return;

  _stopAnimation();
  final direction = velocity / speed;
  var lastPosition = 0.0;
  final animation = AnimationController.unbounded(vsync: _ticker!);
  _activeAnimation = animation;
  animation.addListener(() {
    final delta = animation.value - lastPosition;
    lastPosition = animation.value;
    _gsTopLeftOffset -= direction * delta / _scale;
    markDirty();
  });
  animation
      .animateWith(FrictionSimulation(inertiaFrictionCoefficient, 0, speed))
      .whenCompleteOrCancel(() => _disposeAnimation(animation));
}