handleDownEvent method

void handleDownEvent(
  1. PointerDownEvent event
)

Implementation

void handleDownEvent(PointerDownEvent event) {
  if (null == _old1 && _old2?.device != event.device) {
    _old1 = Pointer(device: event.device, dx: event.position.dx, dy: event.position.dy);
  } else if (null == _old2 && _old1!.device != event.device) {
    _old2 = Pointer(device: event.device, dx: event.position.dx, dy: event.position.dy);
  }
}