detach method

void detach ()

override

Mark this node as detached.

Typically called only from the parent's detach, and by the owner to mark the root of a tree as detached.

Subclasses with children should override this method to first call their inherited detach method, and then detach all their children.

Implementation

@override
void detach() {
  _offset.removeListener(markNeedsLayout);
  super.detach();
}