handlePointerDown method
Called when a pointer-down event occurs.
Implementation
@override
void handlePointerDown(MouseMsg event, Offset localPosition) {
super.handlePointerDown(event, localPosition);
_dragStarted = false;
_lastPosition = localPosition;
_downGlobal = Offset(event.x.toDouble(), event.y.toDouble());
_downButton = event.button;
}