Products Google for Education Blockly Reference Blockly Framework Reference DefaultBlockGroupLayout @objcMembers public final class DefaultBlockGroupLayout: BlockGroupLayout A default implementation of BlockGroupLayout. Super performLayout(includeChildren:) Declaration Swift public override func performLayout(includeChildren: Bool) Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates. Last updated January 25, 2019.