/**
* Adds a child container, which will be processed whenever this container is. Does nothing if the
* child parameter is null. Does nothing if the supplied parameter is already in the child list.
*/
public void attachChild(UIContainer child) {
if (child == null) return;
if (children.contains(child)) return;
child.removeFromParent();
if (child.isActive()) {
getDisplayNode().attachChild(child.getDisplayNode());
}
children.add(child);
child.setParent(this);
// child.updatePosition(true); // Removed as setParent does an updatePosition.
}
