handlerPointerCancel method
Implementation
@override
void handlerPointerCancel(PointerCancelEvent event) {
final pointer = event.pointer;
if (pointer == _pointer && inMoving) {
_startDragPosition = null;
_startDragOffset = null;
_pointer = -1;
inMoving = false;
onCancelDrag(pointer);
}
super.handlerPointerCancel(event);
}