dropChild method Null safety

  1. @protected
  2. @mustCallSuper
void dropChild(
  1. covariant AbstractNode child
)

Disconnect the given node from this node.

Subclasses should call this function when they lose a child.

Implementation

@protected
@mustCallSuper
void dropChild(covariant AbstractNode child) {
  assert(child != null);
  assert(child._parent == this);
  assert(child.attached == attached);
  child._parent = null;
  if (attached)
    child.detach();
}