finalizeDragHandle method
Bakes the drag handle offset into this object's points and saves the shouldRepaint() variables.
Implementation
@mustCallSuper
void finalizeDragHandle() {
if (_dragging) {
finalizeDragHandlePoints(_dragHandleOffset);
_dragHandleFocalPoint = null;
_dragHandleOffset = Offset.zero;
_dragging = false;
}
}