handlePointerDown method
Implementation
@override
void handlePointerDown(PointerDownEvent details) {
  if (explode && explodeGesture == ActivationMode.singleTap) {
    _pointerHoldingTime = DateTime.now();
  }
  super.handlePointerDown(details);
}@override
void handlePointerDown(PointerDownEvent details) {
  if (explode && explodeGesture == ActivationMode.singleTap) {
    _pointerHoldingTime = DateTime.now();
  }
  super.handlePointerDown(details);
}