attach method

  1. @mustCallSuper
void attach(
  1. covariant Object owner
)

Mark this layer as attached to the given owner.

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

Subclasses with children should override this method to attach all their children to the same owner after calling the inherited method, as in super.attach(owner).

Implementation

@mustCallSuper
void attach(covariant Object owner) {
  assert(_owner == null);
  _owner = owner;
}