handleDragUpdate method
Implementation
void handleDragUpdate(DragUpdateDetails details) {
// _drag might be null if the drag activity ended and called _disposeDrag.
assert(_hold == null || _drag == null);
_drag?.update(details);
}
void handleDragUpdate(DragUpdateDetails details) {
// _drag might be null if the drag activity ended and called _disposeDrag.
assert(_hold == null || _drag == null);
_drag?.update(details);
}